Resolved merge conflict with master

17 files changed, 2072 insertions, 651 deletions

diff --git a/src/core/census/context.c b/src/core/census/context.c
index cab58b653c..e60330de64 100644
--- a/src/core/census/context.c
+++ b/src/core/census/context.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2015-2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,16 +31,500 @@
  *
  */
 
-#include "src/core/census/context.h"
-
-#include <string.h>
 #include <grpc/census.h>
 #include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/port_platform.h>
+#include <grpc/support/useful.h>
+#include <stdbool.h>
+#include <string.h>
+#include "src/core/support/string.h"
+
+// Functions in this file support the public context API, including
+// encoding/decoding as part of context propagation across RPC's. The overall
+// requirements (in approximate priority order) for the
+// context representation:
+// 1. Efficient conversion to/from wire format
+// 2. Minimal bytes used on-wire
+// 3. Efficient context creation
+// 4. Efficient lookup of tag value for a key
+// 5. Efficient iteration over tags
+// 6. Minimal memory footprint
+//
+// Notes on tradeoffs/decisions:
+// * tag includes 1 byte length of key, as well as nil-terminating byte. These
+//   are to aid in efficient parsing and the ability to directly return key
+//   strings. This is more important than saving a single byte/tag on the wire.
+// * The wire encoding uses only single byte values. This eliminates the need
+//   to handle endian-ness conversions. It also means there is a hard upper
+//   limit of 255 for both CENSUS_MAX_TAG_KV_LEN and CENSUS_MAX_PROPAGATED_TAGS.
+// * Keep all tag information (keys/values/flags) in a single memory buffer,
+//   that can be directly copied to the wire.
+// * Binary tags share the same structure as, but are encoded separately from,
+//   non-binary tags. This is primarily because non-binary tags are far more
+//   likely to be repeated across multiple RPC calls, so are more efficiently
+//   cached and compressed in any metadata schemes.
+
+// Structure representing a set of tags. Essentially a count of number of tags
+// present, and pointer to a chunk of memory that contains the per-tag details.
+struct tag_set {
+  int ntags;        // number of tags.
+  int ntags_alloc;  // ntags + number of deleted tags (total number of tags
+  // in all of kvm). This will always be == ntags, except during the process
+  // of building a new tag set.
+  size_t kvm_size;  // number of bytes allocated for key/value storage.
+  size_t kvm_used;  // number of bytes of used key/value memory
+  char *kvm;        // key/value memory. Consists of repeated entries of:
+  //   Offset  Size  Description
+  //     0      1    Key length, including trailing 0. (K)
+  //     1      1    Value length. (V)
+  //     2      1    Flags
+  //     3      K    Key bytes
+  //     3 + K  V    Value bytes
+  //
+  // We refer to the first 3 entries as the 'tag header'. If extra values are
+  // introduced in the header, you will need to modify the TAG_HEADER_SIZE
+  // constant, the raw_tag structure (and everything that uses it) and the
+  // encode/decode functions appropriately.
+};
+
+// Number of bytes in tag header.
+#define TAG_HEADER_SIZE 3  // key length (1) + value length (1) + flags (1)
+// Offsets to tag header entries.
+#define KEY_LEN_OFFSET 0
+#define VALUE_LEN_OFFSET 1
+#define FLAG_OFFSET 2
+
+// raw_tag represents the raw-storage form of a tag in the kvm of a tag_set.
+struct raw_tag {
+  uint8_t key_len;
+  uint8_t value_len;
+  uint8_t flags;
+  char *key;
+  char *value;
+};
+
+// Use a reserved flag bit for indication of deleted tag.
+#define CENSUS_TAG_DELETED CENSUS_TAG_RESERVED
+#define CENSUS_TAG_IS_DELETED(flags) (flags & CENSUS_TAG_DELETED)
+
+// Primary (external) representation of a context. Composed of 3 underlying
+// tag_set structs, one for each of the binary/printable propagated tags, and
+// one for everything else. This is to efficiently support tag
+// encoding/decoding.
+struct census_context {
+  struct tag_set tags[3];
+  census_context_status status;
+};
+
+// Indices into the tags member of census_context
+#define PROPAGATED_TAGS 0
+#define PROPAGATED_BINARY_TAGS 1
+#define LOCAL_TAGS 2
+
+// Extract a raw tag given a pointer (raw) to the tag header. Allow for some
+// extra bytes in the tag header (see encode/decode functions for usage: this
+// allows for future expansion of the tag header).
+static char *decode_tag(struct raw_tag *tag, char *header, int offset) {
+  tag->key_len = (uint8_t)(*header++);
+  tag->value_len = (uint8_t)(*header++);
+  tag->flags = (uint8_t)(*header++);
+  header += offset;
+  tag->key = header;
+  header += tag->key_len;
+  tag->value = header;
+  return header + tag->value_len;
+}
 
-/* Placeholder implementation only. */
+// Make a copy (in 'to') of an existing tag_set.
+static void tag_set_copy(struct tag_set *to, const struct tag_set *from) {
+  memcpy(to, from, sizeof(struct tag_set));
+  to->kvm = gpr_malloc(to->kvm_size);
+  memcpy(to->kvm, from->kvm, from->kvm_used);
+}
+
+// Delete a tag from a tag_set, if it exists (returns true if it did).
+static bool tag_set_delete_tag(struct tag_set *tags, const char *key,
+                               size_t key_len) {
+  char *kvp = tags->kvm;
+  for (int i = 0; i < tags->ntags_alloc; i++) {
+    uint8_t *flags = (uint8_t *)(kvp + FLAG_OFFSET);
+    struct raw_tag tag;
+    kvp = decode_tag(&tag, kvp, 0);
+    if (CENSUS_TAG_IS_DELETED(tag.flags)) continue;
+    if ((key_len == tag.key_len) && (memcmp(key, tag.key, key_len) == 0)) {
+      *flags |= CENSUS_TAG_DELETED;
+      tags->ntags--;
+      return true;
+    }
+  }
+  return false;
+}
+
+// Delete a tag from a context, return true if it existed.
+static bool context_delete_tag(census_context *context, const census_tag *tag,
+                               size_t key_len) {
+  return (
+      tag_set_delete_tag(&context->tags[LOCAL_TAGS], tag->key, key_len) ||
+      tag_set_delete_tag(&context->tags[PROPAGATED_TAGS], tag->key, key_len) ||
+      tag_set_delete_tag(&context->tags[PROPAGATED_BINARY_TAGS], tag->key,
+                         key_len));
+}
+
+// Add a tag to a tag_set. Return true on success, false if the tag could
+// not be added because of constraints on tag set size. This function should
+// not be called if the tag may already exist (in a non-deleted state) in
+// the tag_set, as that would result in two tags with the same key.
+static bool tag_set_add_tag(struct tag_set *tags, const census_tag *tag,
+                            size_t key_len) {
+  if (tags->ntags == CENSUS_MAX_PROPAGATED_TAGS) {
+    return false;
+  }
+  const size_t tag_size = key_len + tag->value_len + TAG_HEADER_SIZE;
+  if (tags->kvm_used + tag_size > tags->kvm_size) {
+    // allocate new memory if needed
+    tags->kvm_size += 2 * CENSUS_MAX_TAG_KV_LEN + TAG_HEADER_SIZE;
+    char *new_kvm = gpr_malloc(tags->kvm_size);
+    memcpy(new_kvm, tags->kvm, tags->kvm_used);
+    gpr_free(tags->kvm);
+    tags->kvm = new_kvm;
+  }
+  char *kvp = tags->kvm + tags->kvm_used;
+  *kvp++ = (char)key_len;
+  *kvp++ = (char)tag->value_len;
+  // ensure reserved flags are not used.
+  *kvp++ = (char)(tag->flags & (CENSUS_TAG_PROPAGATE | CENSUS_TAG_STATS |
+                                CENSUS_TAG_BINARY));
+  memcpy(kvp, tag->key, key_len);
+  kvp += key_len;
+  memcpy(kvp, tag->value, tag->value_len);
+  tags->kvm_used += tag_size;
+  tags->ntags++;
+  tags->ntags_alloc++;
+  return true;
+}
+
+// Add/modify/delete a tag to/in a context. Caller must validate that tag key
+// etc. are valid.
+static void context_modify_tag(census_context *context, const census_tag *tag,
+                               size_t key_len) {
+  // First delete the tag if it is already present.
+  bool deleted = context_delete_tag(context, tag, key_len);
+  // Determine if we need to add it back.
+  bool call_add = tag->value != NULL && tag->value_len != 0;
+  bool added = false;
+  if (call_add) {
+    if (CENSUS_TAG_IS_PROPAGATED(tag->flags)) {
+      if (CENSUS_TAG_IS_BINARY(tag->flags)) {
+        added = tag_set_add_tag(&context->tags[PROPAGATED_BINARY_TAGS], tag,
+                                key_len);
+      } else {
+        added = tag_set_add_tag(&context->tags[PROPAGATED_TAGS], tag, key_len);
+      }
+    } else {
+      added = tag_set_add_tag(&context->tags[LOCAL_TAGS], tag, key_len);
+    }
+  }
+  if (deleted) {
+    if (call_add) {
+      context->status.n_modified_tags++;
+    } else {
+      context->status.n_deleted_tags++;
+    }
+  } else {
+    if (added) {
+      context->status.n_added_tags++;
+    } else {
+      context->status.n_ignored_tags++;
+    }
+  }
+}
+
+// Remove memory used for deleted tags from a tag set. Basic algorithm:
+// 1) Walk through tag set to find first deleted tag. Record where it is.
+// 2) Find the next not-deleted tag. Copy all of kvm from there to the end
+//    "over" the deleted tags
+// 3) repeat #1 and #2 until we have seen all tags
+// 4) if we are still looking for a not-deleted tag, then all the end portion
+//    of the kvm is deleted. Just reduce the used amount of memory by the
+//    appropriate amount.
+static void tag_set_flatten(struct tag_set *tags) {
+  if (tags->ntags == tags->ntags_alloc) return;
+  bool found_deleted = false;  // found a deleted tag.
+  char *kvp = tags->kvm;
+  char *dbase = NULL;  // record location of deleted tag
+  for (int i = 0; i < tags->ntags_alloc; i++) {
+    struct raw_tag tag;
+    char *next_kvp = decode_tag(&tag, kvp, 0);
+    if (found_deleted) {
+      if (!CENSUS_TAG_IS_DELETED(tag.flags)) {
+        ptrdiff_t reduce = kvp - dbase;  // #bytes in deleted tags
+        GPR_ASSERT(reduce > 0);
+        ptrdiff_t copy_size = tags->kvm + tags->kvm_used - kvp;
+        GPR_ASSERT(copy_size > 0);
+        memmove(dbase, kvp, (size_t)copy_size);
+        tags->kvm_used -= (size_t)reduce;
+        next_kvp -= reduce;
+        found_deleted = false;
+      }
+    } else {
+      if (CENSUS_TAG_IS_DELETED(tag.flags)) {
+        dbase = kvp;
+        found_deleted = true;
+      }
+    }
+    kvp = next_kvp;
+  }
+  if (found_deleted) {
+    GPR_ASSERT(dbase > tags->kvm);
+    tags->kvm_used = (size_t)(dbase - tags->kvm);
+  }
+  tags->ntags_alloc = tags->ntags;
+}
 
-size_t census_context_serialize(const census_context *context, char *buffer,
-                                size_t buf_size) {
-  /* TODO(aveitch): implement serialization */
+census_context *census_context_create(const census_context *base,
+                                      const census_tag *tags, int ntags,
+                                      census_context_status const **status) {
+  census_context *context = gpr_malloc(sizeof(census_context));
+  // If we are given a base, copy it into our new tag set. Otherwise set it
+  // to zero/NULL everything.
+  if (base == NULL) {
+    memset(context, 0, sizeof(census_context));
+  } else {
+    tag_set_copy(&context->tags[PROPAGATED_TAGS], &base->tags[PROPAGATED_TAGS]);
+    tag_set_copy(&context->tags[PROPAGATED_BINARY_TAGS],
+                 &base->tags[PROPAGATED_BINARY_TAGS]);
+    tag_set_copy(&context->tags[LOCAL_TAGS], &base->tags[LOCAL_TAGS]);
+    memset(&context->status, 0, sizeof(context->status));
+  }
+  // Walk over the additional tags and, for those that aren't invalid, modify
+  // the context to add/replace/delete as required.
+  for (int i = 0; i < ntags; i++) {
+    const census_tag *tag = &tags[i];
+    size_t key_len = strlen(tag->key) + 1;
+    // ignore the tag if it is too long/short.
+    if (key_len != 1 && key_len <= CENSUS_MAX_TAG_KV_LEN &&
+        tag->value_len <= CENSUS_MAX_TAG_KV_LEN) {
+      context_modify_tag(context, tag, key_len);
+    } else {
+      context->status.n_invalid_tags++;
+    }
+  }
+  // Remove any deleted tags, update status if needed, and return.
+  tag_set_flatten(&context->tags[PROPAGATED_TAGS]);
+  tag_set_flatten(&context->tags[PROPAGATED_BINARY_TAGS]);
+  tag_set_flatten(&context->tags[LOCAL_TAGS]);
+  context->status.n_propagated_tags = context->tags[PROPAGATED_TAGS].ntags;
+  context->status.n_propagated_binary_tags =
+      context->tags[PROPAGATED_BINARY_TAGS].ntags;
+  context->status.n_local_tags = context->tags[LOCAL_TAGS].ntags;
+  if (status) {
+    *status = &context->status;
+  }
+  return context;
+}
+
+const census_context_status *census_context_get_status(
+    const census_context *context) {
+  return &context->status;
+}
+
+void census_context_destroy(census_context *context) {
+  gpr_free(context->tags[PROPAGATED_TAGS].kvm);
+  gpr_free(context->tags[PROPAGATED_BINARY_TAGS].kvm);
+  gpr_free(context->tags[LOCAL_TAGS].kvm);
+  gpr_free(context);
+}
+
+void census_context_initialize_iterator(const census_context *context,
+                                        census_context_iterator *iterator) {
+  iterator->context = context;
+  iterator->index = 0;
+  if (context->tags[PROPAGATED_TAGS].ntags != 0) {
+    iterator->base = PROPAGATED_TAGS;
+    iterator->kvm = context->tags[PROPAGATED_TAGS].kvm;
+  } else if (context->tags[PROPAGATED_BINARY_TAGS].ntags != 0) {
+    iterator->base = PROPAGATED_BINARY_TAGS;
+    iterator->kvm = context->tags[PROPAGATED_BINARY_TAGS].kvm;
+  } else if (context->tags[LOCAL_TAGS].ntags != 0) {
+    iterator->base = LOCAL_TAGS;
+    iterator->kvm = context->tags[LOCAL_TAGS].kvm;
+  } else {
+    iterator->base = -1;
+  }
+}
+
+int census_context_next_tag(census_context_iterator *iterator,
+                            census_tag *tag) {
+  if (iterator->base < 0) {
+    return 0;
+  }
+  struct raw_tag raw;
+  iterator->kvm = decode_tag(&raw, iterator->kvm, 0);
+  tag->key = raw.key;
+  tag->value = raw.value;
+  tag->value_len = raw.value_len;
+  tag->flags = raw.flags;
+  if (++iterator->index == iterator->context->tags[iterator->base].ntags) {
+    do {
+      if (iterator->base == LOCAL_TAGS) {
+        iterator->base = -1;
+        return 1;
+      }
+    } while (iterator->context->tags[++iterator->base].ntags == 0);
+    iterator->index = 0;
+    iterator->kvm = iterator->context->tags[iterator->base].kvm;
+  }
+  return 1;
+}
+
+// Find a tag in a tag_set by key. Return true if found, false otherwise.
+static bool tag_set_get_tag(const struct tag_set *tags, const char *key,
+                            size_t key_len, census_tag *tag) {
+  char *kvp = tags->kvm;
+  for (int i = 0; i < tags->ntags; i++) {
+    struct raw_tag raw;
+    kvp = decode_tag(&raw, kvp, 0);
+    if (key_len == raw.key_len && memcmp(raw.key, key, key_len) == 0) {
+      tag->key = raw.key;
+      tag->value = raw.value;
+      tag->value_len = raw.value_len;
+      tag->flags = raw.flags;
+      return true;
+    }
+  }
+  return false;
+}
+
+int census_context_get_tag(const census_context *context, const char *key,
+                           census_tag *tag) {
+  size_t key_len = strlen(key) + 1;
+  if (key_len == 1) {
+    return 0;
+  }
+  if (tag_set_get_tag(&context->tags[PROPAGATED_TAGS], key, key_len, tag) ||
+      tag_set_get_tag(&context->tags[PROPAGATED_BINARY_TAGS], key, key_len,
+                      tag) ||
+      tag_set_get_tag(&context->tags[LOCAL_TAGS], key, key_len, tag)) {
+    return 1;
+  }
   return 0;
 }
+
+// Context encoding and decoding functions.
+//
+// Wire format for tag_set's on the wire:
+//
+// First, a tag set header:
+//
+// offset   bytes  description
+//   0        1    version number
+//   1        1    number of bytes in this header. This allows for future
+//                 expansion.
+//   2        1    number of bytes in each tag header.
+//   3        1    ntags value from tag set.
+//
+//   This is followed by the key/value memory from struct tag_set.
+
+#define ENCODED_VERSION 0      // Version number
+#define ENCODED_HEADER_SIZE 4  // size of tag set header
+
+// Encode a tag set. Returns 0 if buffer is too small.
+static size_t tag_set_encode(const struct tag_set *tags, char *buffer,
+                             size_t buf_size) {
+  if (buf_size < ENCODED_HEADER_SIZE + tags->kvm_used) {
+    return 0;
+  }
+  buf_size -= ENCODED_HEADER_SIZE;
+  *buffer++ = (char)ENCODED_VERSION;
+  *buffer++ = (char)ENCODED_HEADER_SIZE;
+  *buffer++ = (char)TAG_HEADER_SIZE;
+  *buffer++ = (char)tags->ntags;
+  if (tags->ntags == 0) {
+    return ENCODED_HEADER_SIZE;
+  }
+  memcpy(buffer, tags->kvm, tags->kvm_used);
+  return ENCODED_HEADER_SIZE + tags->kvm_used;
+}
+
+char *census_context_encode(const census_context *context, char *buffer,
+                            size_t buf_size, size_t *print_buf_size,
+                            size_t *bin_buf_size) {
+  *print_buf_size =
+      tag_set_encode(&context->tags[PROPAGATED_TAGS], buffer, buf_size);
+  if (*print_buf_size == 0) {
+    return NULL;
+  }
+  char *b_buffer = buffer + *print_buf_size;
+  *bin_buf_size = tag_set_encode(&context->tags[PROPAGATED_BINARY_TAGS],
+                                 b_buffer, buf_size - *print_buf_size);
+  if (*bin_buf_size == 0) {
+    return NULL;
+  }
+  return b_buffer;
+}
+
+// Decode a tag set.
+static void tag_set_decode(struct tag_set *tags, const char *buffer,
+                           size_t size) {
+  uint8_t version = (uint8_t)(*buffer++);
+  uint8_t header_size = (uint8_t)(*buffer++);
+  uint8_t tag_header_size = (uint8_t)(*buffer++);
+  tags->ntags = tags->ntags_alloc = (int)(*buffer++);
+  if (tags->ntags == 0) {
+    tags->ntags_alloc = 0;
+    tags->kvm_size = 0;
+    tags->kvm_used = 0;
+    tags->kvm = NULL;
+    return;
+  }
+  if (header_size != ENCODED_HEADER_SIZE) {
+    GPR_ASSERT(version != ENCODED_VERSION);
+    GPR_ASSERT(ENCODED_HEADER_SIZE < header_size);
+    buffer += (header_size - ENCODED_HEADER_SIZE);
+  }
+  tags->kvm_used = size - header_size;
+  tags->kvm_size = tags->kvm_used + CENSUS_MAX_TAG_KV_LEN;
+  tags->kvm = gpr_malloc(tags->kvm_size);
+  if (tag_header_size != TAG_HEADER_SIZE) {
+    // something new in the tag information. I don't understand it, so
+    // don't copy it over.
+    GPR_ASSERT(version != ENCODED_VERSION);
+    GPR_ASSERT(tag_header_size > TAG_HEADER_SIZE);
+    char *kvp = tags->kvm;
+    for (int i = 0; i < tags->ntags; i++) {
+      memcpy(kvp, buffer, TAG_HEADER_SIZE);
+      kvp += header_size;
+      struct raw_tag raw;
+      buffer =
+          decode_tag(&raw, (char *)buffer, tag_header_size - TAG_HEADER_SIZE);
+      memcpy(kvp, raw.key, (size_t)raw.key_len + raw.value_len);
+      kvp += raw.key_len + raw.value_len;
+    }
+  } else {
+    memcpy(tags->kvm, buffer, tags->kvm_used);
+  }
+}
+
+census_context *census_context_decode(const char *buffer, size_t size,
+                                      const char *bin_buffer, size_t bin_size) {
+  census_context *context = gpr_malloc(sizeof(census_context));
+  memset(&context->tags[LOCAL_TAGS], 0, sizeof(struct tag_set));
+  if (buffer == NULL) {
+    memset(&context->tags[PROPAGATED_TAGS], 0, sizeof(struct tag_set));
+  } else {
+    tag_set_decode(&context->tags[PROPAGATED_TAGS], buffer, size);
+  }
+  if (bin_buffer == NULL) {
+    memset(&context->tags[PROPAGATED_BINARY_TAGS], 0, sizeof(struct tag_set));
+  } else {
+    tag_set_decode(&context->tags[PROPAGATED_BINARY_TAGS], bin_buffer,
+                   bin_size);
+  }
+  memset(&context->status, 0, sizeof(context->status));
+  context->status.n_propagated_tags = context->tags[PROPAGATED_TAGS].ntags;
+  context->status.n_propagated_binary_tags =
+      context->tags[PROPAGATED_BINARY_TAGS].ntags;
+  // TODO(aveitch): check that BINARY flag is correct for each type.
+  return context;
+}
diff --git a/src/core/census/placeholders.c b/src/core/census/placeholders.c
index 5829cc9460..fe23d13971 100644
--- a/src/core/census/placeholders.c
+++ b/src/core/census/placeholders.c
@@ -37,11 +37,6 @@
 
 /* Placeholders for the pending APIs */
 
-census_tag_set *census_context_tag_set(census_context *context) {
-  (void)context;
-  abort();
-}
-
 int census_get_trace_record(census_trace_record *trace_record) {
   (void)trace_record;
   abort();
@@ -73,7 +68,7 @@ const census_aggregation *census_view_aggregrations(const census_view *view) {
   abort();
 }
 
-census_view *census_view_create(uint32_t metric_id, const census_tag_set *tags,
+census_view *census_view_create(uint32_t metric_id, const census_context *tags,
                                 const census_aggregation *aggregations,
                                 size_t naggregations) {
   (void)metric_id;
@@ -83,7 +78,7 @@ census_view *census_view_create(uint32_t metric_id, const census_tag_set *tags,
   abort();
 }
 
-const census_tag_set *census_view_tags(const census_view *view) {
+const census_context *census_view_tags(const census_view *view) {
   (void)view;
   abort();
 }
diff --git a/src/core/census/tag_set.c b/src/core/census/tag_set.c
deleted file mode 100644
index 9b65a1dfa1..0000000000
--- a/src/core/census/tag_set.c
+++ /dev/null
@@ -1,535 +0,0 @@
-/*
- *
- * Copyright 2015-2016, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#include <grpc/census.h>
-#include <grpc/support/alloc.h>
-#include <grpc/support/log.h>
-#include <grpc/support/port_platform.h>
-#include <grpc/support/useful.h>
-#include <stdbool.h>
-#include <string.h>
-#include "src/core/support/string.h"
-
-// Functions in this file support the public tag_set API, as well as
-// encoding/decoding tag_sets as part of context propagation across
-// RPC's. The overall requirements (in approximate priority order) for the
-// tag_set representations:
-// 1. Efficient conversion to/from wire format
-// 2. Minimal bytes used on-wire
-// 3. Efficient tag set creation
-// 4. Efficient lookup of value for a key
-// 5. Efficient lookup of value for an index (to support iteration)
-// 6. Minimal memory footprint
-//
-// Notes on tradeoffs/decisions:
-// * tag includes 1 byte length of key, as well as nil-terminating byte. These
-//   are to aid in efficient parsing and the ability to directly return key
-//   strings. This is more important than saving a single byte/tag on the wire.
-// * The wire encoding uses only single byte values. This eliminates the need
-//   to handle endian-ness conversions. It also means there is a hard upper
-//   limit of 255 for both CENSUS_MAX_TAG_KV_LEN and CENSUS_MAX_PROPAGATED_TAGS.
-// * Keep all tag information (keys/values/flags) in a single memory buffer,
-//   that can be directly copied to the wire.14
-// * Binary tags share the same structure as, but are encoded separately from,
-//   non-binary tags. This is primarily because non-binary tags are far more
-//   likely to be repeated across multiple RPC calls, so are more efficiently
-//   cached and compressed in any metadata schemes.
-// * all lengths etc. are restricted to one byte. This eliminates endian
-//   issues.
-
-// Structure representing a set of tags. Essentially a count of number of tags
-// present, and pointer to a chunk of memory that contains the per-tag details.
-struct tag_set {
-  int ntags;        // number of tags.
-  int ntags_alloc;  // ntags + number of deleted tags (total number of tags
-  // in all of kvm). This will always be == ntags, except during the process
-  // of building a new tag set.
-  size_t kvm_size;  // number of bytes allocated for key/value storage.
-  size_t kvm_used;  // number of bytes of used key/value memory
-  char *kvm;        // key/value memory. Consists of repeated entries of:
-  //   Offset  Size  Description
-  //     0      1    Key length, including trailing 0. (K)
-  //     1      1    Value length. (V)
-  //     2      1    Flags
-  //     3      K    Key bytes
-  //     3 + K  V    Value bytes
-  //
-  // We refer to the first 3 entries as the 'tag header'. If extra values are
-  // introduced in the header, you will need to modify the TAG_HEADER_SIZE
-  // constant, the raw_tag structure (and everything that uses it) and the
-  // encode/decode functions appropriately.
-};
-
-// Number of bytes in tag header.
-#define TAG_HEADER_SIZE 3  // key length (1) + value length (1) + flags (1)
-// Offsets to tag header entries.
-#define KEY_LEN_OFFSET 0
-#define VALUE_LEN_OFFSET 1
-#define FLAG_OFFSET 2
-
-// raw_tag represents the raw-storage form of a tag in the kvm of a tag_set.
-struct raw_tag {
-  uint8_t key_len;
-  uint8_t value_len;
-  uint8_t flags;
-  char *key;
-  char *value;
-};
-
-// Use a reserved flag bit for indication of deleted tag.
-#define CENSUS_TAG_DELETED CENSUS_TAG_RESERVED
-#define CENSUS_TAG_IS_DELETED(flags) (flags & CENSUS_TAG_DELETED)
-
-// Primary (external) representation of a tag set. Composed of 3 underlying
-// tag_set structs, one for each of the binary/printable propagated tags, and
-// one for everything else. This is to efficiently support tag
-// encoding/decoding.
-struct census_tag_set {
-  struct tag_set tags[3];
-  census_tag_set_create_status status;
-};
-
-// Indices into the tags member of census_tag_set
-#define PROPAGATED_TAGS 0
-#define PROPAGATED_BINARY_TAGS 1
-#define LOCAL_TAGS 2
-
-// Extract a raw tag given a pointer (raw) to the tag header. Allow for some
-// extra bytes in the tag header (see encode/decode functions for usage: this
-// allows for future expansion of the tag header).
-static char *decode_tag(struct raw_tag *tag, char *header, int offset) {
-  tag->key_len = (uint8_t)(*header++);
-  tag->value_len = (uint8_t)(*header++);
-  tag->flags = (uint8_t)(*header++);
-  header += offset;
-  tag->key = header;
-  header += tag->key_len;
-  tag->value = header;
-  return header + tag->value_len;
-}
-
-// Make a copy (in 'to') of an existing tag_set.
-static void tag_set_copy(struct tag_set *to, const struct tag_set *from) {
-  memcpy(to, from, sizeof(struct tag_set));
-  to->kvm = gpr_malloc(to->kvm_size);
-  memcpy(to->kvm, from->kvm, from->kvm_used);
-}
-
-// Delete a tag from a tag_set, if it exists (returns true if it did).
-static bool tag_set_delete_tag(struct tag_set *tags, const char *key,
-                               size_t key_len) {
-  char *kvp = tags->kvm;
-  for (int i = 0; i < tags->ntags_alloc; i++) {
-    uint8_t *flags = (uint8_t *)(kvp + FLAG_OFFSET);
-    struct raw_tag tag;
-    kvp = decode_tag(&tag, kvp, 0);
-    if (CENSUS_TAG_IS_DELETED(tag.flags)) continue;
-    if ((key_len == tag.key_len) && (memcmp(key, tag.key, key_len) == 0)) {
-      *flags |= CENSUS_TAG_DELETED;
-      tags->ntags--;
-      return true;
-    }
-  }
-  return false;
-}
-
-// Delete a tag from a census_tag_set, return true if it existed.
-static bool cts_delete_tag(census_tag_set *tags, const census_tag *tag,
-                           size_t key_len) {
-  return (tag_set_delete_tag(&tags->tags[LOCAL_TAGS], tag->key, key_len) ||
-          tag_set_delete_tag(&tags->tags[PROPAGATED_TAGS], tag->key, key_len) ||
-          tag_set_delete_tag(&tags->tags[PROPAGATED_BINARY_TAGS], tag->key,
-                             key_len));
-}
-
-// Add a tag to a tag_set. Return true on sucess, false if the tag could
-// not be added because of constraints on tag set size. This function should
-// not be called if the tag may already exist (in a non-deleted state) in
-// the tag_set, as that would result in two tags with the same key.
-static bool tag_set_add_tag(struct tag_set *tags, const census_tag *tag,
-                            size_t key_len) {
-  if (tags->ntags == CENSUS_MAX_PROPAGATED_TAGS) {
-    return false;
-  }
-  const size_t tag_size = key_len + tag->value_len + TAG_HEADER_SIZE;
-  if (tags->kvm_used + tag_size > tags->kvm_size) {
-    // allocate new memory if needed
-    tags->kvm_size += 2 * CENSUS_MAX_TAG_KV_LEN + TAG_HEADER_SIZE;
-    char *new_kvm = gpr_malloc(tags->kvm_size);
-    memcpy(new_kvm, tags->kvm, tags->kvm_used);
-    gpr_free(tags->kvm);
-    tags->kvm = new_kvm;
-  }
-  char *kvp = tags->kvm + tags->kvm_used;
-  *kvp++ = (char)key_len;
-  *kvp++ = (char)tag->value_len;
-  // ensure reserved flags are not used.
-  *kvp++ = (char)(tag->flags & (CENSUS_TAG_PROPAGATE | CENSUS_TAG_STATS |
-                                CENSUS_TAG_BINARY));
-  memcpy(kvp, tag->key, key_len);
-  kvp += key_len;
-  memcpy(kvp, tag->value, tag->value_len);
-  tags->kvm_used += tag_size;
-  tags->ntags++;
-  tags->ntags_alloc++;
-  return true;
-}
-
-// Add/modify/delete a tag to/in a census_tag_set. Caller must validate that
-// tag key etc. are valid.
-static void cts_modify_tag(census_tag_set *tags, const census_tag *tag,
-                           size_t key_len) {
-  // First delete the tag if it is already present.
-  bool deleted = cts_delete_tag(tags, tag, key_len);
-  // Determine if we need to add it back.
-  bool call_add = tag->value != NULL && tag->value_len != 0;
-  bool added = false;
-  if (call_add) {
-    if (CENSUS_TAG_IS_PROPAGATED(tag->flags)) {
-      if (CENSUS_TAG_IS_BINARY(tag->flags)) {
-        added =
-            tag_set_add_tag(&tags->tags[PROPAGATED_BINARY_TAGS], tag, key_len);
-      } else {
-        added = tag_set_add_tag(&tags->tags[PROPAGATED_TAGS], tag, key_len);
-      }
-    } else {
-      added = tag_set_add_tag(&tags->tags[LOCAL_TAGS], tag, key_len);
-    }
-  }
-  if (deleted) {
-    if (call_add) {
-      tags->status.n_modified_tags++;
-    } else {
-      tags->status.n_deleted_tags++;
-    }
-  } else {
-    if (added) {
-      tags->status.n_added_tags++;
-    } else {
-      tags->status.n_ignored_tags++;
-    }
-  }
-}
-
-// Remove memory used for deleted tags from the tag set. Basic algorithm:
-// 1) Walk through tag set to find first deleted tag. Record where it is.
-// 2) Find the next not-deleted tag. Copy all of kvm from there to the end
-//    "over" the deleted tags
-// 3) repeat #1 and #2 until we have seen all tags
-// 4) if we are still looking for a not-deleted tag, then all the end portion
-//    of the kvm is deleted. Just reduce the used amount of memory by the
-//    appropriate amount.
-static void tag_set_flatten(struct tag_set *tags) {
-  if (tags->ntags == tags->ntags_alloc) return;
-  bool found_deleted = false;  // found a deleted tag.
-  char *kvp = tags->kvm;
-  char *dbase = NULL;  // record location of deleted tag
-  for (int i = 0; i < tags->ntags_alloc; i++) {
-    struct raw_tag tag;
-    char *next_kvp = decode_tag(&tag, kvp, 0);
-    if (found_deleted) {
-      if (!CENSUS_TAG_IS_DELETED(tag.flags)) {
-        ptrdiff_t reduce = kvp - dbase;  // #bytes in deleted tags
-        GPR_ASSERT(reduce > 0);
-        ptrdiff_t copy_size = tags->kvm + tags->kvm_used - kvp;
-        GPR_ASSERT(copy_size > 0);
-        memmove(dbase, kvp, (size_t)copy_size);
-        tags->kvm_used -= (size_t)reduce;
-        next_kvp -= reduce;
-        found_deleted = false;
-      }
-    } else {
-      if (CENSUS_TAG_IS_DELETED(tag.flags)) {
-        dbase = kvp;
-        found_deleted = true;
-      }
-    }
-    kvp = next_kvp;
-  }
-  if (found_deleted) {
-    GPR_ASSERT(dbase > tags->kvm);
-    tags->kvm_used = (size_t)(dbase - tags->kvm);
-  }
-  tags->ntags_alloc = tags->ntags;
-}
-
-census_tag_set *census_tag_set_create(
-    const census_tag_set *base, const census_tag *tags, int ntags,
-    census_tag_set_create_status const **status) {
-  census_tag_set *new_ts = gpr_malloc(sizeof(census_tag_set));
-  // If we are given a base, copy it into our new tag set. Otherwise set it
-  // to zero/NULL everything.
-  if (base == NULL) {
-    memset(new_ts, 0, sizeof(census_tag_set));
-  } else {
-    tag_set_copy(&new_ts->tags[PROPAGATED_TAGS], &base->tags[PROPAGATED_TAGS]);
-    tag_set_copy(&new_ts->tags[PROPAGATED_BINARY_TAGS],
-                 &base->tags[PROPAGATED_BINARY_TAGS]);
-    tag_set_copy(&new_ts->tags[LOCAL_TAGS], &base->tags[LOCAL_TAGS]);
-    memset(&new_ts->status, 0, sizeof(new_ts->status));
-  }
-  // Walk over the additional tags and, for those that aren't invalid, modify
-  // the tag set to add/replace/delete as required.
-  for (int i = 0; i < ntags; i++) {
-    const census_tag *tag = &tags[i];
-    size_t key_len = strlen(tag->key) + 1;
-    // ignore the tag if it is too long/short.
-    if (key_len != 1 && key_len <= CENSUS_MAX_TAG_KV_LEN &&
-        tag->value_len <= CENSUS_MAX_TAG_KV_LEN) {
-      cts_modify_tag(new_ts, tag, key_len);
-    } else {
-      new_ts->status.n_invalid_tags++;
-    }
-  }
-  // Remove any deleted tags, update status if needed, and return.
-  tag_set_flatten(&new_ts->tags[PROPAGATED_TAGS]);
-  tag_set_flatten(&new_ts->tags[PROPAGATED_BINARY_TAGS]);
-  tag_set_flatten(&new_ts->tags[LOCAL_TAGS]);
-  new_ts->status.n_propagated_tags = new_ts->tags[PROPAGATED_TAGS].ntags;
-  new_ts->status.n_propagated_binary_tags =
-      new_ts->tags[PROPAGATED_BINARY_TAGS].ntags;
-  new_ts->status.n_local_tags = new_ts->tags[LOCAL_TAGS].ntags;
-  if (status) {
-    *status = &new_ts->status;
-  }
-  return new_ts;
-}
-
-const census_tag_set_create_status *census_tag_set_get_create_status(
-    const census_tag_set *tags) {
-  return &tags->status;
-}
-
-void census_tag_set_destroy(census_tag_set *tags) {
-  gpr_free(tags->tags[PROPAGATED_TAGS].kvm);
-  gpr_free(tags->tags[PROPAGATED_BINARY_TAGS].kvm);
-  gpr_free(tags->tags[LOCAL_TAGS].kvm);
-  gpr_free(tags);
-}
-
-// Initialize a tag set iterator. Must be called before first use of the
-// iterator.
-void census_tag_set_initialize_iterator(const census_tag_set *tags,
-                                        census_tag_set_iterator *iterator) {
-  iterator->tags = tags;
-  iterator->index = 0;
-  if (tags->tags[PROPAGATED_TAGS].ntags != 0) {
-    iterator->base = PROPAGATED_TAGS;
-    iterator->kvm = tags->tags[PROPAGATED_TAGS].kvm;
-  } else if (tags->tags[PROPAGATED_BINARY_TAGS].ntags != 0) {
-    iterator->base = PROPAGATED_BINARY_TAGS;
-    iterator->kvm = tags->tags[PROPAGATED_BINARY_TAGS].kvm;
-  } else if (tags->tags[LOCAL_TAGS].ntags != 0) {
-    iterator->base = LOCAL_TAGS;
-    iterator->kvm = tags->tags[LOCAL_TAGS].kvm;
-  } else {
-    iterator->base = -1;
-  }
-}
-
-// Get the contents of the "next" tag in the tag set. If there are no more
-// tags in the tag set, returns 0 (and 'tag' contents will be unchanged),
-// otherwise returns 1. */
-int census_tag_set_next_tag(census_tag_set_iterator *iterator,
-                            census_tag *tag) {
-  if (iterator->base < 0) {
-    return 0;
-  }
-  struct raw_tag raw;
-  iterator->kvm = decode_tag(&raw, iterator->kvm, 0);
-  tag->key = raw.key;
-  tag->value = raw.value;
-  tag->value_len = raw.value_len;
-  tag->flags = raw.flags;
-  if (++iterator->index == iterator->tags->tags[iterator->base].ntags) {
-    do {
-      if (iterator->base == LOCAL_TAGS) {
-        iterator->base = -1;
-        return 1;
-      }
-    } while (iterator->tags->tags[++iterator->base].ntags == 0);
-    iterator->index = 0;
-    iterator->kvm = iterator->tags->tags[iterator->base].kvm;
-  }
-  return 1;
-}
-
-// Find a tag in a tag_set by key. Return true if found, false otherwise.
-static bool tag_set_get_tag_by_key(const struct tag_set *tags, const char *key,
-                                   size_t key_len, census_tag *tag) {
-  char *kvp = tags->kvm;
-  for (int i = 0; i < tags->ntags; i++) {
-    struct raw_tag raw;
-    kvp = decode_tag(&raw, kvp, 0);
-    if (key_len == raw.key_len && memcmp(raw.key, key, key_len) == 0) {
-      tag->key = raw.key;
-      tag->value = raw.value;
-      tag->value_len = raw.value_len;
-      tag->flags = raw.flags;
-      return true;
-    }
-  }
-  return false;
-}
-
-int census_tag_set_get_tag_by_key(const census_tag_set *tags, const char *key,
-                                  census_tag *tag) {
-  size_t key_len = strlen(key) + 1;
-  if (key_len == 1) {
-    return 0;
-  }
-  if (tag_set_get_tag_by_key(&tags->tags[PROPAGATED_TAGS], key, key_len, tag) ||
-      tag_set_get_tag_by_key(&tags->tags[PROPAGATED_BINARY_TAGS], key, key_len,
-                             tag) ||
-      tag_set_get_tag_by_key(&tags->tags[LOCAL_TAGS], key, key_len, tag)) {
-    return 1;
-  }
-  return 0;
-}
-
-// tag_set encoding and decoding functions.
-//
-// Wire format for tag sets on the wire:
-//
-// First, a tag set header:
-//
-// offset   bytes  description
-//   0        1    version number
-//   1        1    number of bytes in this header. This allows for future
-//                 expansion.
-//   2        1    number of bytes in each tag header.
-//   3        1    ntags value from tag set.
-//
-//   This is followed by the key/value memory from struct tag_set.
-
-#define ENCODED_VERSION 0      // Version number
-#define ENCODED_HEADER_SIZE 4  // size of tag set header
-
-// Encode a tag set. Returns 0 if buffer is too small.
-static size_t tag_set_encode(const struct tag_set *tags, char *buffer,
-                             size_t buf_size) {
-  if (buf_size < ENCODED_HEADER_SIZE + tags->kvm_used) {
-    return 0;
-  }
-  buf_size -= ENCODED_HEADER_SIZE;
-  *buffer++ = (char)ENCODED_VERSION;
-  *buffer++ = (char)ENCODED_HEADER_SIZE;
-  *buffer++ = (char)TAG_HEADER_SIZE;
-  *buffer++ = (char)tags->ntags;
-  if (tags->ntags == 0) {
-    return ENCODED_HEADER_SIZE;
-  }
-  memcpy(buffer, tags->kvm, tags->kvm_used);
-  return ENCODED_HEADER_SIZE + tags->kvm_used;
-}
-
-char *census_tag_set_encode(const census_tag_set *tags, char *buffer,
-                            size_t buf_size, size_t *print_buf_size,
-                            size_t *bin_buf_size) {
-  *print_buf_size =
-      tag_set_encode(&tags->tags[PROPAGATED_TAGS], buffer, buf_size);
-  if (*print_buf_size == 0) {
-    return NULL;
-  }
-  char *b_buffer = buffer + *print_buf_size;
-  *bin_buf_size = tag_set_encode(&tags->tags[PROPAGATED_BINARY_TAGS], b_buffer,
-                                 buf_size - *print_buf_size);
-  if (*bin_buf_size == 0) {
-    return NULL;
-  }
-  return b_buffer;
-}
-
-// Decode a tag set.
-static void tag_set_decode(struct tag_set *tags, const char *buffer,
-                           size_t size) {
-  uint8_t version = (uint8_t)(*buffer++);
-  uint8_t header_size = (uint8_t)(*buffer++);
-  uint8_t tag_header_size = (uint8_t)(*buffer++);
-  tags->ntags = tags->ntags_alloc = (int)(*buffer++);
-  if (tags->ntags == 0) {
-    tags->ntags_alloc = 0;
-    tags->kvm_size = 0;
-    tags->kvm_used = 0;
-    tags->kvm = NULL;
-    return;
-  }
-  if (header_size != ENCODED_HEADER_SIZE) {
-    GPR_ASSERT(version != ENCODED_VERSION);
-    GPR_ASSERT(ENCODED_HEADER_SIZE < header_size);
-    buffer += (header_size - ENCODED_HEADER_SIZE);
-  }
-  tags->kvm_used = size - header_size;
-  tags->kvm_size = tags->kvm_used + CENSUS_MAX_TAG_KV_LEN;
-  tags->kvm = gpr_malloc(tags->kvm_size);
-  if (tag_header_size != TAG_HEADER_SIZE) {
-    // something new in the tag information. I don't understand it, so
-    // don't copy it over.
-    GPR_ASSERT(version != ENCODED_VERSION);
-    GPR_ASSERT(tag_header_size > TAG_HEADER_SIZE);
-    char *kvp = tags->kvm;
-    for (int i = 0; i < tags->ntags; i++) {
-      memcpy(kvp, buffer, TAG_HEADER_SIZE);
-      kvp += header_size;
-      struct raw_tag raw;
-      buffer =
-          decode_tag(&raw, (char *)buffer, tag_header_size - TAG_HEADER_SIZE);
-      memcpy(kvp, raw.key, (size_t)raw.key_len + raw.value_len);
-      kvp += raw.key_len + raw.value_len;
-    }
-  } else {
-    memcpy(tags->kvm, buffer, tags->kvm_used);
-  }
-}
-
-census_tag_set *census_tag_set_decode(const char *buffer, size_t size,
-                                      const char *bin_buffer, size_t bin_size) {
-  census_tag_set *new_ts = gpr_malloc(sizeof(census_tag_set));
-  memset(&new_ts->tags[LOCAL_TAGS], 0, sizeof(struct tag_set));
-  if (buffer == NULL) {
-    memset(&new_ts->tags[PROPAGATED_TAGS], 0, sizeof(struct tag_set));
-  } else {
-    tag_set_decode(&new_ts->tags[PROPAGATED_TAGS], buffer, size);
-  }
-  if (bin_buffer == NULL) {
-    memset(&new_ts->tags[PROPAGATED_BINARY_TAGS], 0, sizeof(struct tag_set));
-  } else {
-    tag_set_decode(&new_ts->tags[PROPAGATED_BINARY_TAGS], bin_buffer, bin_size);
-  }
-  memset(&new_ts->status, 0, sizeof(new_ts->status));
-  new_ts->status.n_propagated_tags = new_ts->tags[PROPAGATED_TAGS].ntags;
-  new_ts->status.n_propagated_binary_tags =
-      new_ts->tags[PROPAGATED_BINARY_TAGS].ntags;
-  // TODO(aveitch): check that BINARY flag is correct for each type.
-  return new_ts;
-}
diff --git a/src/core/security/server_secure_chttp2.c b/src/core/security/server_secure_chttp2.c
index 92daab9bf1..84a883390c 100644
--- a/src/core/security/server_secure_chttp2.c
+++ b/src/core/security/server_secure_chttp2.c
@@ -241,7 +241,6 @@ int grpc_server_add_secure_http2_port(grpc_server *server, const char *addr,
   }
   grpc_resolved_addresses_destroy(resolved);
 
-
   /* Register with the server only upon success */
   grpc_server_add_listener(&exec_ctx, server, state, start, destroy);
 
diff --git a/src/python/grpcio/commands.py b/src/python/grpcio/commands.py
index 98ad2e571d..27e95609d6 100644
--- a/src/python/grpcio/commands.py
+++ b/src/python/grpcio/commands.py
@@ -67,7 +67,7 @@ class CommandError(Exception):
 
 # TODO(atash): Remove this once PyPI has better Linux bdist support. See
 # https://bitbucket.org/pypa/pypi/issues/120/binary-wheels-for-linux-are-not-supported
-def _get_linux_bdist_egg(decorated_basename, target_egg_basename):
+def _get_grpc_custom_bdist_egg(decorated_basename, target_egg_basename):
   """Returns a string path to a .egg file for Linux to install.
 
   If we can retrieve a pre-compiled egg from online, uses it. Else, emits a
@@ -100,6 +100,7 @@ def _get_linux_bdist_egg(decorated_basename, target_egg_basename):
 
 
 class EggNameMixin(object):
+  """Mixin for setuptools.Command classes to enable acquiring the egg name."""
 
   def egg_name(self, with_custom):
     """
@@ -124,25 +125,25 @@ class Install(install.install, EggNameMixin):
   """
 
   user_options = install.install.user_options + [
-      # TODO(atash): remove this once manylinux gets on PyPI. See
+      # TODO(atash): remove this once PyPI has better Linux bdist support. See
       # https://bitbucket.org/pypa/pypi/issues/120/binary-wheels-for-linux-are-not-supported
-      ('use-linux-bdist', None,
-       'Whether to retrieve a binary for Linux instead of building from '
-       'source.'),
+      ('use-grpc-custom-bdist', None,
+       'Whether to retrieve a binary from the gRPC binary repository instead '
+       'of building from source.'),
   ]
 
   def initialize_options(self):
     install.install.initialize_options(self)
-    self.use_linux_bdist = False
+    self.use_grpc_custom_bdist = False
 
   def finalize_options(self):
     install.install.finalize_options(self)
 
   def run(self):
-    if self.use_linux_bdist:
+    if self.use_grpc_custom_bdist:
       try:
-        egg_path = _get_linux_bdist_egg(self.egg_name(True),
-                                        self.egg_name(False))
+        egg_path = _get_grpc_custom_bdist_egg(self.egg_name(True),
+                                              self.egg_name(False))
       except CommandError as error:
         sys.stderr.write(
             '\nWARNING: Failed to acquire grpcio prebuilt binary:\n'
diff --git a/src/python/grpcio/grpc/_cython/.gitignore b/src/python/grpcio/grpc/_cython/.gitignore
index c315029288..306e3ad277 100644
--- a/src/python/grpcio/grpc/_cython/.gitignore
+++ b/src/python/grpcio/grpc/_cython/.gitignore
@@ -1,5 +1,4 @@
-*.h
-*.c
+cygrpc.c
 *.a
 *.so
 *.dll
diff --git a/src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxi b/src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxi
index 9b10d2ae75..9d6e017026 100644
--- a/src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxi
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/grpc.pxi
@@ -28,15 +28,20 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 cimport libc.time
-from libc.stdint cimport int64_t, uint32_t, int32_t
 
 
-cdef extern from "grpc/support/alloc.h":
+cdef extern from "grpc/_cython/loader.h":
+
+  ctypedef int int32_t
+  ctypedef unsigned uint32_t
+  ctypedef long int64_t
+
+  int pygrpc_load_core(const char*)
+
   void *gpr_malloc(size_t size)
   void gpr_free(void *ptr)
   void *gpr_realloc(void *p, size_t size)
 
-cdef extern from "grpc/support/slice.h":
   ctypedef struct gpr_slice:
     # don't worry about writing out the members of gpr_slice; we never access
     # them directly.
@@ -55,9 +60,6 @@ cdef extern from "grpc/support/slice.h":
   void *gpr_slice_start_ptr "GPR_SLICE_START_PTR" (gpr_slice s)
   size_t gpr_slice_length "GPR_SLICE_LENGTH" (gpr_slice s)
 
-
-cdef extern from "grpc/support/time.h":
-
   ctypedef enum gpr_clock_type:
     GPR_CLOCK_MONOTONIC
     GPR_CLOCK_REALTIME
@@ -78,8 +80,6 @@ cdef extern from "grpc/support/time.h":
   gpr_timespec gpr_convert_clock_type(gpr_timespec t,
                                       gpr_clock_type target_clock)
 
-
-cdef extern from "grpc/status.h":
   ctypedef enum grpc_status_code:
     GRPC_STATUS_OK
     GRPC_STATUS_CANCELLED
@@ -100,14 +100,10 @@ cdef extern from "grpc/status.h":
     GRPC_STATUS_DATA_LOSS
     GRPC_STATUS__DO_NOT_USE
 
-
-cdef extern from "grpc/byte_buffer_reader.h":
   struct grpc_byte_buffer_reader:
     # We don't care about the internals
     pass
 
-
-cdef extern from "grpc/byte_buffer.h":
   ctypedef struct grpc_byte_buffer:
     # We don't care about the internals.
     pass
@@ -123,9 +119,6 @@ cdef extern from "grpc/byte_buffer.h":
                                    gpr_slice *slice)
   void grpc_byte_buffer_reader_destroy(grpc_byte_buffer_reader *reader)
 
-
-cdef extern from "grpc/grpc.h":
-
   const char *GRPC_ARG_PRIMARY_USER_AGENT_STRING
   const char *GRPC_ARG_ENABLE_CENSUS
   const char *GRPC_ARG_MAX_CONCURRENT_STREAMS
@@ -333,9 +326,6 @@ cdef extern from "grpc/grpc.h":
   void grpc_server_cancel_all_calls(grpc_server *server)
   void grpc_server_destroy(grpc_server *server)
 
-
-cdef extern from "grpc/grpc_security.h":
-
   ctypedef struct grpc_ssl_pem_key_cert_pair:
     const char *private_key
     const char *certificate_chain "cert_chain"
diff --git a/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi b/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi
index d7ad9e5215..9e14b967e0 100644
--- a/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi
+++ b/src/python/grpcio/grpc/_cython/_cygrpc/records.pyx.pxi
@@ -146,8 +146,13 @@ cdef class Timespec:
         gpr_convert_clock_type(self.c_time, GPR_CLOCK_REALTIME))
     return <double>real_time.seconds + <double>real_time.nanoseconds / 1e9
 
-  infinite_future = Timespec(float("+inf"))
-  infinite_past = Timespec(float("-inf"))
+  @staticmethod
+  def infinite_future():
+    return Timespec(float("+inf"))
+
+  @staticmethod
+  def infinite_past():
+    return Timespec(float("-inf"))
 
 
 cdef class CallDetails:
diff --git a/src/python/grpcio/grpc/_cython/cygrpc.pyx b/src/python/grpcio/grpc/_cython/cygrpc.pyx
index 297c8001c5..3967c3045f 100644
--- a/src/python/grpcio/grpc/_cython/cygrpc.pyx
+++ b/src/python/grpcio/grpc/_cython/cygrpc.pyx
@@ -29,6 +29,9 @@
 
 cimport cpython
 
+import pkg_resources
+import os.path
+
 # TODO(atash): figure out why the coverage tool gets confused about the Cython
 # coverage plugin when the following files don't have a '.pxi' suffix.
 include "grpc/_cython/_cygrpc/call.pyx.pxi"
@@ -44,11 +47,19 @@ include "grpc/_cython/_cygrpc/server.pyx.pxi"
 
 cdef class _ModuleState:
 
+  cdef bint is_loaded
+
   def __cinit__(self):
+    filename = pkg_resources.resource_filename(
+        'grpc._cython', '_windows/grpc_c.64.python')
+    if not pygrpc_load_core(filename):
+      raise ImportError('failed to load core gRPC library')
     grpc_init()
+    self.is_loaded = True
 
   def __dealloc__(self):
-    grpc_shutdown()
+    if self.is_loaded:
+      grpc_shutdown()
 
 _module_state = _ModuleState()
 
diff --git a/src/python/grpcio/grpc/_cython/imports.generated.c b/src/python/grpcio/grpc/_cython/imports.generated.c
new file mode 100644
index 0000000000..b818f3491b
--- /dev/null
+++ b/src/python/grpcio/grpc/_cython/imports.generated.c
@@ -0,0 +1,564 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#include "imports.generated.h"
+
+#ifdef GPR_WIN32
+
+census_initialize_type census_initialize_import;
+census_shutdown_type census_shutdown_import;
+census_supported_type census_supported_import;
+census_enabled_type census_enabled_import;
+census_context_serialize_type census_context_serialize_import;
+census_trace_mask_type census_trace_mask_import;
+census_set_trace_mask_type census_set_trace_mask_import;
+census_start_rpc_op_timestamp_type census_start_rpc_op_timestamp_import;
+census_start_client_rpc_op_type census_start_client_rpc_op_import;
+census_set_rpc_client_peer_type census_set_rpc_client_peer_import;
+census_start_server_rpc_op_type census_start_server_rpc_op_import;
+census_start_op_type census_start_op_import;
+census_end_op_type census_end_op_import;
+census_trace_print_type census_trace_print_import;
+census_trace_scan_start_type census_trace_scan_start_import;
+census_get_trace_record_type census_get_trace_record_import;
+census_trace_scan_end_type census_trace_scan_end_import;
+census_tag_set_create_type census_tag_set_create_import;
+census_tag_set_destroy_type census_tag_set_destroy_import;
+census_tag_set_get_create_status_type census_tag_set_get_create_status_import;
+census_tag_set_initialize_iterator_type census_tag_set_initialize_iterator_import;
+census_tag_set_next_tag_type census_tag_set_next_tag_import;
+census_tag_set_get_tag_by_key_type census_tag_set_get_tag_by_key_import;
+census_tag_set_encode_type census_tag_set_encode_import;
+census_tag_set_decode_type census_tag_set_decode_import;
+census_context_tag_set_type census_context_tag_set_import;
+census_record_values_type census_record_values_import;
+census_view_create_type census_view_create_import;
+census_view_delete_type census_view_delete_import;
+census_view_metric_type census_view_metric_import;
+census_view_naggregations_type census_view_naggregations_import;
+census_view_tags_type census_view_tags_import;
+census_view_aggregrations_type census_view_aggregrations_import;
+census_view_get_data_type census_view_get_data_import;
+census_view_reset_type census_view_reset_import;
+grpc_compression_algorithm_parse_type grpc_compression_algorithm_parse_import;
+grpc_compression_algorithm_name_type grpc_compression_algorithm_name_import;
+grpc_compression_algorithm_for_level_type grpc_compression_algorithm_for_level_import;
+grpc_compression_options_init_type grpc_compression_options_init_import;
+grpc_compression_options_enable_algorithm_type grpc_compression_options_enable_algorithm_import;
+grpc_compression_options_disable_algorithm_type grpc_compression_options_disable_algorithm_import;
+grpc_compression_options_is_algorithm_enabled_type grpc_compression_options_is_algorithm_enabled_import;
+grpc_metadata_array_init_type grpc_metadata_array_init_import;
+grpc_metadata_array_destroy_type grpc_metadata_array_destroy_import;
+grpc_call_details_init_type grpc_call_details_init_import;
+grpc_call_details_destroy_type grpc_call_details_destroy_import;
+grpc_register_plugin_type grpc_register_plugin_import;
+grpc_init_type grpc_init_import;
+grpc_shutdown_type grpc_shutdown_import;
+grpc_version_string_type grpc_version_string_import;
+grpc_completion_queue_create_type grpc_completion_queue_create_import;
+grpc_completion_queue_next_type grpc_completion_queue_next_import;
+grpc_completion_queue_pluck_type grpc_completion_queue_pluck_import;
+grpc_completion_queue_shutdown_type grpc_completion_queue_shutdown_import;
+grpc_completion_queue_destroy_type grpc_completion_queue_destroy_import;
+grpc_alarm_create_type grpc_alarm_create_import;
+grpc_alarm_cancel_type grpc_alarm_cancel_import;
+grpc_alarm_destroy_type grpc_alarm_destroy_import;
+grpc_channel_check_connectivity_state_type grpc_channel_check_connectivity_state_import;
+grpc_channel_watch_connectivity_state_type grpc_channel_watch_connectivity_state_import;
+grpc_channel_create_call_type grpc_channel_create_call_import;
+grpc_channel_ping_type grpc_channel_ping_import;
+grpc_channel_register_call_type grpc_channel_register_call_import;
+grpc_channel_create_registered_call_type grpc_channel_create_registered_call_import;
+grpc_call_start_batch_type grpc_call_start_batch_import;
+grpc_call_get_peer_type grpc_call_get_peer_import;
+grpc_census_call_set_context_type grpc_census_call_set_context_import;
+grpc_census_call_get_context_type grpc_census_call_get_context_import;
+grpc_channel_get_target_type grpc_channel_get_target_import;
+grpc_insecure_channel_create_type grpc_insecure_channel_create_import;
+grpc_lame_client_channel_create_type grpc_lame_client_channel_create_import;
+grpc_channel_destroy_type grpc_channel_destroy_import;
+grpc_call_cancel_type grpc_call_cancel_import;
+grpc_call_cancel_with_status_type grpc_call_cancel_with_status_import;
+grpc_call_destroy_type grpc_call_destroy_import;
+grpc_server_request_call_type grpc_server_request_call_import;
+grpc_server_register_method_type grpc_server_register_method_import;
+grpc_server_request_registered_call_type grpc_server_request_registered_call_import;
+grpc_server_create_type grpc_server_create_import;
+grpc_server_register_completion_queue_type grpc_server_register_completion_queue_import;
+grpc_server_add_insecure_http2_port_type grpc_server_add_insecure_http2_port_import;
+grpc_server_start_type grpc_server_start_import;
+grpc_server_shutdown_and_notify_type grpc_server_shutdown_and_notify_import;
+grpc_server_cancel_all_calls_type grpc_server_cancel_all_calls_import;
+grpc_server_destroy_type grpc_server_destroy_import;
+grpc_tracer_set_enabled_type grpc_tracer_set_enabled_import;
+grpc_header_key_is_legal_type grpc_header_key_is_legal_import;
+grpc_header_nonbin_value_is_legal_type grpc_header_nonbin_value_is_legal_import;
+grpc_is_binary_header_type grpc_is_binary_header_import;
+grpc_auth_property_iterator_next_type grpc_auth_property_iterator_next_import;
+grpc_auth_context_property_iterator_type grpc_auth_context_property_iterator_import;
+grpc_auth_context_peer_identity_type grpc_auth_context_peer_identity_import;
+grpc_auth_context_find_properties_by_name_type grpc_auth_context_find_properties_by_name_import;
+grpc_auth_context_peer_identity_property_name_type grpc_auth_context_peer_identity_property_name_import;
+grpc_auth_context_peer_is_authenticated_type grpc_auth_context_peer_is_authenticated_import;
+grpc_call_auth_context_type grpc_call_auth_context_import;
+grpc_auth_context_release_type grpc_auth_context_release_import;
+grpc_auth_context_add_property_type grpc_auth_context_add_property_import;
+grpc_auth_context_add_cstring_property_type grpc_auth_context_add_cstring_property_import;
+grpc_auth_context_set_peer_identity_property_name_type grpc_auth_context_set_peer_identity_property_name_import;
+grpc_channel_credentials_release_type grpc_channel_credentials_release_import;
+grpc_google_default_credentials_create_type grpc_google_default_credentials_create_import;
+grpc_ssl_credentials_create_type grpc_ssl_credentials_create_import;
+grpc_call_credentials_release_type grpc_call_credentials_release_import;
+grpc_composite_channel_credentials_create_type grpc_composite_channel_credentials_create_import;
+grpc_composite_call_credentials_create_type grpc_composite_call_credentials_create_import;
+grpc_google_compute_engine_credentials_create_type grpc_google_compute_engine_credentials_create_import;
+grpc_max_auth_token_lifetime_type grpc_max_auth_token_lifetime_import;
+grpc_service_account_jwt_access_credentials_create_type grpc_service_account_jwt_access_credentials_create_import;
+grpc_google_refresh_token_credentials_create_type grpc_google_refresh_token_credentials_create_import;
+grpc_access_token_credentials_create_type grpc_access_token_credentials_create_import;
+grpc_google_iam_credentials_create_type grpc_google_iam_credentials_create_import;
+grpc_metadata_credentials_create_from_plugin_type grpc_metadata_credentials_create_from_plugin_import;
+grpc_secure_channel_create_type grpc_secure_channel_create_import;
+grpc_server_credentials_release_type grpc_server_credentials_release_import;
+grpc_ssl_server_credentials_create_type grpc_ssl_server_credentials_create_import;
+grpc_server_add_secure_http2_port_type grpc_server_add_secure_http2_port_import;
+grpc_call_set_credentials_type grpc_call_set_credentials_import;
+grpc_server_credentials_set_auth_metadata_processor_type grpc_server_credentials_set_auth_metadata_processor_import;
+gpr_malloc_type gpr_malloc_import;
+gpr_free_type gpr_free_import;
+gpr_realloc_type gpr_realloc_import;
+gpr_malloc_aligned_type gpr_malloc_aligned_import;
+gpr_free_aligned_type gpr_free_aligned_import;
+gpr_set_allocation_functions_type gpr_set_allocation_functions_import;
+gpr_get_allocation_functions_type gpr_get_allocation_functions_import;
+grpc_raw_byte_buffer_create_type grpc_raw_byte_buffer_create_import;
+grpc_raw_compressed_byte_buffer_create_type grpc_raw_compressed_byte_buffer_create_import;
+grpc_byte_buffer_copy_type grpc_byte_buffer_copy_import;
+grpc_byte_buffer_length_type grpc_byte_buffer_length_import;
+grpc_byte_buffer_destroy_type grpc_byte_buffer_destroy_import;
+grpc_byte_buffer_reader_init_type grpc_byte_buffer_reader_init_import;
+grpc_byte_buffer_reader_destroy_type grpc_byte_buffer_reader_destroy_import;
+grpc_byte_buffer_reader_next_type grpc_byte_buffer_reader_next_import;
+grpc_byte_buffer_reader_readall_type grpc_byte_buffer_reader_readall_import;
+grpc_raw_byte_buffer_from_reader_type grpc_raw_byte_buffer_from_reader_import;
+gpr_log_type gpr_log_import;
+gpr_log_message_type gpr_log_message_import;
+gpr_set_log_function_type gpr_set_log_function_import;
+gpr_slice_ref_type gpr_slice_ref_import;
+gpr_slice_unref_type gpr_slice_unref_import;
+gpr_slice_new_type gpr_slice_new_import;
+gpr_slice_new_with_len_type gpr_slice_new_with_len_import;
+gpr_slice_malloc_type gpr_slice_malloc_import;
+gpr_slice_from_copied_string_type gpr_slice_from_copied_string_import;
+gpr_slice_from_copied_buffer_type gpr_slice_from_copied_buffer_import;
+gpr_slice_from_static_string_type gpr_slice_from_static_string_import;
+gpr_slice_sub_type gpr_slice_sub_import;
+gpr_slice_sub_no_ref_type gpr_slice_sub_no_ref_import;
+gpr_slice_split_tail_type gpr_slice_split_tail_import;
+gpr_slice_split_head_type gpr_slice_split_head_import;
+gpr_empty_slice_type gpr_empty_slice_import;
+gpr_slice_cmp_type gpr_slice_cmp_import;
+gpr_slice_str_cmp_type gpr_slice_str_cmp_import;
+gpr_slice_buffer_init_type gpr_slice_buffer_init_import;
+gpr_slice_buffer_destroy_type gpr_slice_buffer_destroy_import;
+gpr_slice_buffer_add_type gpr_slice_buffer_add_import;
+gpr_slice_buffer_add_indexed_type gpr_slice_buffer_add_indexed_import;
+gpr_slice_buffer_addn_type gpr_slice_buffer_addn_import;
+gpr_slice_buffer_tiny_add_type gpr_slice_buffer_tiny_add_import;
+gpr_slice_buffer_pop_type gpr_slice_buffer_pop_import;
+gpr_slice_buffer_reset_and_unref_type gpr_slice_buffer_reset_and_unref_import;
+gpr_slice_buffer_swap_type gpr_slice_buffer_swap_import;
+gpr_slice_buffer_move_into_type gpr_slice_buffer_move_into_import;
+gpr_slice_buffer_trim_end_type gpr_slice_buffer_trim_end_import;
+gpr_slice_buffer_move_first_type gpr_slice_buffer_move_first_import;
+gpr_slice_buffer_take_first_type gpr_slice_buffer_take_first_import;
+gpr_mu_init_type gpr_mu_init_import;
+gpr_mu_destroy_type gpr_mu_destroy_import;
+gpr_mu_lock_type gpr_mu_lock_import;
+gpr_mu_unlock_type gpr_mu_unlock_import;
+gpr_mu_trylock_type gpr_mu_trylock_import;
+gpr_cv_init_type gpr_cv_init_import;
+gpr_cv_destroy_type gpr_cv_destroy_import;
+gpr_cv_wait_type gpr_cv_wait_import;
+gpr_cv_signal_type gpr_cv_signal_import;
+gpr_cv_broadcast_type gpr_cv_broadcast_import;
+gpr_once_init_type gpr_once_init_import;
+gpr_event_init_type gpr_event_init_import;
+gpr_event_set_type gpr_event_set_import;
+gpr_event_get_type gpr_event_get_import;
+gpr_event_wait_type gpr_event_wait_import;
+gpr_ref_init_type gpr_ref_init_import;
+gpr_ref_type gpr_ref_import;
+gpr_refn_type gpr_refn_import;
+gpr_unref_type gpr_unref_import;
+gpr_stats_init_type gpr_stats_init_import;
+gpr_stats_inc_type gpr_stats_inc_import;
+gpr_stats_read_type gpr_stats_read_import;
+gpr_time_0_type gpr_time_0_import;
+gpr_inf_future_type gpr_inf_future_import;
+gpr_inf_past_type gpr_inf_past_import;
+gpr_time_init_type gpr_time_init_import;
+gpr_now_type gpr_now_import;
+gpr_convert_clock_type_type gpr_convert_clock_type_import;
+gpr_time_cmp_type gpr_time_cmp_import;
+gpr_time_max_type gpr_time_max_import;
+gpr_time_min_type gpr_time_min_import;
+gpr_time_add_type gpr_time_add_import;
+gpr_time_sub_type gpr_time_sub_import;
+gpr_time_from_micros_type gpr_time_from_micros_import;
+gpr_time_from_nanos_type gpr_time_from_nanos_import;
+gpr_time_from_millis_type gpr_time_from_millis_import;
+gpr_time_from_seconds_type gpr_time_from_seconds_import;
+gpr_time_from_minutes_type gpr_time_from_minutes_import;
+gpr_time_from_hours_type gpr_time_from_hours_import;
+gpr_time_to_millis_type gpr_time_to_millis_import;
+gpr_time_similar_type gpr_time_similar_import;
+gpr_sleep_until_type gpr_sleep_until_import;
+gpr_timespec_to_micros_type gpr_timespec_to_micros_import;
+gpr_avl_create_type gpr_avl_create_import;
+gpr_avl_ref_type gpr_avl_ref_import;
+gpr_avl_unref_type gpr_avl_unref_import;
+gpr_avl_add_type gpr_avl_add_import;
+gpr_avl_remove_type gpr_avl_remove_import;
+gpr_avl_get_type gpr_avl_get_import;
+gpr_cmdline_create_type gpr_cmdline_create_import;
+gpr_cmdline_add_int_type gpr_cmdline_add_int_import;
+gpr_cmdline_add_flag_type gpr_cmdline_add_flag_import;
+gpr_cmdline_add_string_type gpr_cmdline_add_string_import;
+gpr_cmdline_on_extra_arg_type gpr_cmdline_on_extra_arg_import;
+gpr_cmdline_set_survive_failure_type gpr_cmdline_set_survive_failure_import;
+gpr_cmdline_parse_type gpr_cmdline_parse_import;
+gpr_cmdline_destroy_type gpr_cmdline_destroy_import;
+gpr_cmdline_usage_string_type gpr_cmdline_usage_string_import;
+gpr_cpu_num_cores_type gpr_cpu_num_cores_import;
+gpr_cpu_current_cpu_type gpr_cpu_current_cpu_import;
+gpr_histogram_create_type gpr_histogram_create_import;
+gpr_histogram_destroy_type gpr_histogram_destroy_import;
+gpr_histogram_add_type gpr_histogram_add_import;
+gpr_histogram_merge_type gpr_histogram_merge_import;
+gpr_histogram_percentile_type gpr_histogram_percentile_import;
+gpr_histogram_mean_type gpr_histogram_mean_import;
+gpr_histogram_stddev_type gpr_histogram_stddev_import;
+gpr_histogram_variance_type gpr_histogram_variance_import;
+gpr_histogram_maximum_type gpr_histogram_maximum_import;
+gpr_histogram_minimum_type gpr_histogram_minimum_import;
+gpr_histogram_count_type gpr_histogram_count_import;
+gpr_histogram_sum_type gpr_histogram_sum_import;
+gpr_histogram_sum_of_squares_type gpr_histogram_sum_of_squares_import;
+gpr_histogram_get_contents_type gpr_histogram_get_contents_import;
+gpr_histogram_merge_contents_type gpr_histogram_merge_contents_import;
+gpr_join_host_port_type gpr_join_host_port_import;
+gpr_split_host_port_type gpr_split_host_port_import;
+gpr_format_message_type gpr_format_message_import;
+gpr_strdup_type gpr_strdup_import;
+gpr_asprintf_type gpr_asprintf_import;
+gpr_subprocess_binary_extension_type gpr_subprocess_binary_extension_import;
+gpr_subprocess_create_type gpr_subprocess_create_import;
+gpr_subprocess_destroy_type gpr_subprocess_destroy_import;
+gpr_subprocess_join_type gpr_subprocess_join_import;
+gpr_subprocess_interrupt_type gpr_subprocess_interrupt_import;
+gpr_thd_new_type gpr_thd_new_import;
+gpr_thd_options_default_type gpr_thd_options_default_import;
+gpr_thd_options_set_detached_type gpr_thd_options_set_detached_import;
+gpr_thd_options_set_joinable_type gpr_thd_options_set_joinable_import;
+gpr_thd_options_is_detached_type gpr_thd_options_is_detached_import;
+gpr_thd_options_is_joinable_type gpr_thd_options_is_joinable_import;
+gpr_thd_currentid_type gpr_thd_currentid_import;
+gpr_thd_join_type gpr_thd_join_import;
+
+void pygrpc_load_imports(HMODULE library) {
+  census_initialize_import = (census_initialize_type) GetProcAddress(library, "census_initialize");
+  census_shutdown_import = (census_shutdown_type) GetProcAddress(library, "census_shutdown");
+  census_supported_import = (census_supported_type) GetProcAddress(library, "census_supported");
+  census_enabled_import = (census_enabled_type) GetProcAddress(library, "census_enabled");
+  census_context_serialize_import = (census_context_serialize_type) GetProcAddress(library, "census_context_serialize");
+  census_trace_mask_import = (census_trace_mask_type) GetProcAddress(library, "census_trace_mask");
+  census_set_trace_mask_import = (census_set_trace_mask_type) GetProcAddress(library, "census_set_trace_mask");
+  census_start_rpc_op_timestamp_import = (census_start_rpc_op_timestamp_type) GetProcAddress(library, "census_start_rpc_op_timestamp");
+  census_start_client_rpc_op_import = (census_start_client_rpc_op_type) GetProcAddress(library, "census_start_client_rpc_op");
+  census_set_rpc_client_peer_import = (census_set_rpc_client_peer_type) GetProcAddress(library, "census_set_rpc_client_peer");
+  census_start_server_rpc_op_import = (census_start_server_rpc_op_type) GetProcAddress(library, "census_start_server_rpc_op");
+  census_start_op_import = (census_start_op_type) GetProcAddress(library, "census_start_op");
+  census_end_op_import = (census_end_op_type) GetProcAddress(library, "census_end_op");
+  census_trace_print_import = (census_trace_print_type) GetProcAddress(library, "census_trace_print");
+  census_trace_scan_start_import = (census_trace_scan_start_type) GetProcAddress(library, "census_trace_scan_start");
+  census_get_trace_record_import = (census_get_trace_record_type) GetProcAddress(library, "census_get_trace_record");
+  census_trace_scan_end_import = (census_trace_scan_end_type) GetProcAddress(library, "census_trace_scan_end");
+  census_tag_set_create_import = (census_tag_set_create_type) GetProcAddress(library, "census_tag_set_create");
+  census_tag_set_destroy_import = (census_tag_set_destroy_type) GetProcAddress(library, "census_tag_set_destroy");
+  census_tag_set_get_create_status_import = (census_tag_set_get_create_status_type) GetProcAddress(library, "census_tag_set_get_create_status");
+  census_tag_set_initialize_iterator_import = (census_tag_set_initialize_iterator_type) GetProcAddress(library, "census_tag_set_initialize_iterator");
+  census_tag_set_next_tag_import = (census_tag_set_next_tag_type) GetProcAddress(library, "census_tag_set_next_tag");
+  census_tag_set_get_tag_by_key_import = (census_tag_set_get_tag_by_key_type) GetProcAddress(library, "census_tag_set_get_tag_by_key");
+  census_tag_set_encode_import = (census_tag_set_encode_type) GetProcAddress(library, "census_tag_set_encode");
+  census_tag_set_decode_import = (census_tag_set_decode_type) GetProcAddress(library, "census_tag_set_decode");
+  census_context_tag_set_import = (census_context_tag_set_type) GetProcAddress(library, "census_context_tag_set");
+  census_record_values_import = (census_record_values_type) GetProcAddress(library, "census_record_values");
+  census_view_create_import = (census_view_create_type) GetProcAddress(library, "census_view_create");
+  census_view_delete_import = (census_view_delete_type) GetProcAddress(library, "census_view_delete");
+  census_view_metric_import = (census_view_metric_type) GetProcAddress(library, "census_view_metric");
+  census_view_naggregations_import = (census_view_naggregations_type) GetProcAddress(library, "census_view_naggregations");
+  census_view_tags_import = (census_view_tags_type) GetProcAddress(library, "census_view_tags");
+  census_view_aggregrations_import = (census_view_aggregrations_type) GetProcAddress(library, "census_view_aggregrations");
+  census_view_get_data_import = (census_view_get_data_type) GetProcAddress(library, "census_view_get_data");
+  census_view_reset_import = (census_view_reset_type) GetProcAddress(library, "census_view_reset");
+  grpc_compression_algorithm_parse_import = (grpc_compression_algorithm_parse_type) GetProcAddress(library, "grpc_compression_algorithm_parse");
+  grpc_compression_algorithm_name_import = (grpc_compression_algorithm_name_type) GetProcAddress(library, "grpc_compression_algorithm_name");
+  grpc_compression_algorithm_for_level_import = (grpc_compression_algorithm_for_level_type) GetProcAddress(library, "grpc_compression_algorithm_for_level");
+  grpc_compression_options_init_import = (grpc_compression_options_init_type) GetProcAddress(library, "grpc_compression_options_init");
+  grpc_compression_options_enable_algorithm_import = (grpc_compression_options_enable_algorithm_type) GetProcAddress(library, "grpc_compression_options_enable_algorithm");
+  grpc_compression_options_disable_algorithm_import = (grpc_compression_options_disable_algorithm_type) GetProcAddress(library, "grpc_compression_options_disable_algorithm");
+  grpc_compression_options_is_algorithm_enabled_import = (grpc_compression_options_is_algorithm_enabled_type) GetProcAddress(library, "grpc_compression_options_is_algorithm_enabled");
+  grpc_metadata_array_init_import = (grpc_metadata_array_init_type) GetProcAddress(library, "grpc_metadata_array_init");
+  grpc_metadata_array_destroy_import = (grpc_metadata_array_destroy_type) GetProcAddress(library, "grpc_metadata_array_destroy");
+  grpc_call_details_init_import = (grpc_call_details_init_type) GetProcAddress(library, "grpc_call_details_init");
+  grpc_call_details_destroy_import = (grpc_call_details_destroy_type) GetProcAddress(library, "grpc_call_details_destroy");
+  grpc_register_plugin_import = (grpc_register_plugin_type) GetProcAddress(library, "grpc_register_plugin");
+  grpc_init_import = (grpc_init_type) GetProcAddress(library, "grpc_init");
+  grpc_shutdown_import = (grpc_shutdown_type) GetProcAddress(library, "grpc_shutdown");
+  grpc_version_string_import = (grpc_version_string_type) GetProcAddress(library, "grpc_version_string");
+  grpc_completion_queue_create_import = (grpc_completion_queue_create_type) GetProcAddress(library, "grpc_completion_queue_create");
+  grpc_completion_queue_next_import = (grpc_completion_queue_next_type) GetProcAddress(library, "grpc_completion_queue_next");
+  grpc_completion_queue_pluck_import = (grpc_completion_queue_pluck_type) GetProcAddress(library, "grpc_completion_queue_pluck");
+  grpc_completion_queue_shutdown_import = (grpc_completion_queue_shutdown_type) GetProcAddress(library, "grpc_completion_queue_shutdown");
+  grpc_completion_queue_destroy_import = (grpc_completion_queue_destroy_type) GetProcAddress(library, "grpc_completion_queue_destroy");
+  grpc_alarm_create_import = (grpc_alarm_create_type) GetProcAddress(library, "grpc_alarm_create");
+  grpc_alarm_cancel_import = (grpc_alarm_cancel_type) GetProcAddress(library, "grpc_alarm_cancel");
+  grpc_alarm_destroy_import = (grpc_alarm_destroy_type) GetProcAddress(library, "grpc_alarm_destroy");
+  grpc_channel_check_connectivity_state_import = (grpc_channel_check_connectivity_state_type) GetProcAddress(library, "grpc_channel_check_connectivity_state");
+  grpc_channel_watch_connectivity_state_import = (grpc_channel_watch_connectivity_state_type) GetProcAddress(library, "grpc_channel_watch_connectivity_state");
+  grpc_channel_create_call_import = (grpc_channel_create_call_type) GetProcAddress(library, "grpc_channel_create_call");
+  grpc_channel_ping_import = (grpc_channel_ping_type) GetProcAddress(library, "grpc_channel_ping");
+  grpc_channel_register_call_import = (grpc_channel_register_call_type) GetProcAddress(library, "grpc_channel_register_call");
+  grpc_channel_create_registered_call_import = (grpc_channel_create_registered_call_type) GetProcAddress(library, "grpc_channel_create_registered_call");
+  grpc_call_start_batch_import = (grpc_call_start_batch_type) GetProcAddress(library, "grpc_call_start_batch");
+  grpc_call_get_peer_import = (grpc_call_get_peer_type) GetProcAddress(library, "grpc_call_get_peer");
+  grpc_census_call_set_context_import = (grpc_census_call_set_context_type) GetProcAddress(library, "grpc_census_call_set_context");
+  grpc_census_call_get_context_import = (grpc_census_call_get_context_type) GetProcAddress(library, "grpc_census_call_get_context");
+  grpc_channel_get_target_import = (grpc_channel_get_target_type) GetProcAddress(library, "grpc_channel_get_target");
+  grpc_insecure_channel_create_import = (grpc_insecure_channel_create_type) GetProcAddress(library, "grpc_insecure_channel_create");
+  grpc_lame_client_channel_create_import = (grpc_lame_client_channel_create_type) GetProcAddress(library, "grpc_lame_client_channel_create");
+  grpc_channel_destroy_import = (grpc_channel_destroy_type) GetProcAddress(library, "grpc_channel_destroy");
+  grpc_call_cancel_import = (grpc_call_cancel_type) GetProcAddress(library, "grpc_call_cancel");
+  grpc_call_cancel_with_status_import = (grpc_call_cancel_with_status_type) GetProcAddress(library, "grpc_call_cancel_with_status");
+  grpc_call_destroy_import = (grpc_call_destroy_type) GetProcAddress(library, "grpc_call_destroy");
+  grpc_server_request_call_import = (grpc_server_request_call_type) GetProcAddress(library, "grpc_server_request_call");
+  grpc_server_register_method_import = (grpc_server_register_method_type) GetProcAddress(library, "grpc_server_register_method");
+  grpc_server_request_registered_call_import = (grpc_server_request_registered_call_type) GetProcAddress(library, "grpc_server_request_registered_call");
+  grpc_server_create_import = (grpc_server_create_type) GetProcAddress(library, "grpc_server_create");
+  grpc_server_register_completion_queue_import = (grpc_server_register_completion_queue_type) GetProcAddress(library, "grpc_server_register_completion_queue");
+  grpc_server_add_insecure_http2_port_import = (grpc_server_add_insecure_http2_port_type) GetProcAddress(library, "grpc_server_add_insecure_http2_port");
+  grpc_server_start_import = (grpc_server_start_type) GetProcAddress(library, "grpc_server_start");
+  grpc_server_shutdown_and_notify_import = (grpc_server_shutdown_and_notify_type) GetProcAddress(library, "grpc_server_shutdown_and_notify");
+  grpc_server_cancel_all_calls_import = (grpc_server_cancel_all_calls_type) GetProcAddress(library, "grpc_server_cancel_all_calls");
+  grpc_server_destroy_import = (grpc_server_destroy_type) GetProcAddress(library, "grpc_server_destroy");
+  grpc_tracer_set_enabled_import = (grpc_tracer_set_enabled_type) GetProcAddress(library, "grpc_tracer_set_enabled");
+  grpc_header_key_is_legal_import = (grpc_header_key_is_legal_type) GetProcAddress(library, "grpc_header_key_is_legal");
+  grpc_header_nonbin_value_is_legal_import = (grpc_header_nonbin_value_is_legal_type) GetProcAddress(library, "grpc_header_nonbin_value_is_legal");
+  grpc_is_binary_header_import = (grpc_is_binary_header_type) GetProcAddress(library, "grpc_is_binary_header");
+  grpc_auth_property_iterator_next_import = (grpc_auth_property_iterator_next_type) GetProcAddress(library, "grpc_auth_property_iterator_next");
+  grpc_auth_context_property_iterator_import = (grpc_auth_context_property_iterator_type) GetProcAddress(library, "grpc_auth_context_property_iterator");
+  grpc_auth_context_peer_identity_import = (grpc_auth_context_peer_identity_type) GetProcAddress(library, "grpc_auth_context_peer_identity");
+  grpc_auth_context_find_properties_by_name_import = (grpc_auth_context_find_properties_by_name_type) GetProcAddress(library, "grpc_auth_context_find_properties_by_name");
+  grpc_auth_context_peer_identity_property_name_import = (grpc_auth_context_peer_identity_property_name_type) GetProcAddress(library, "grpc_auth_context_peer_identity_property_name");
+  grpc_auth_context_peer_is_authenticated_import = (grpc_auth_context_peer_is_authenticated_type) GetProcAddress(library, "grpc_auth_context_peer_is_authenticated");
+  grpc_call_auth_context_import = (grpc_call_auth_context_type) GetProcAddress(library, "grpc_call_auth_context");
+  grpc_auth_context_release_import = (grpc_auth_context_release_type) GetProcAddress(library, "grpc_auth_context_release");
+  grpc_auth_context_add_property_import = (grpc_auth_context_add_property_type) GetProcAddress(library, "grpc_auth_context_add_property");
+  grpc_auth_context_add_cstring_property_import = (grpc_auth_context_add_cstring_property_type) GetProcAddress(library, "grpc_auth_context_add_cstring_property");
+  grpc_auth_context_set_peer_identity_property_name_import = (grpc_auth_context_set_peer_identity_property_name_type) GetProcAddress(library, "grpc_auth_context_set_peer_identity_property_name");
+  grpc_channel_credentials_release_import = (grpc_channel_credentials_release_type) GetProcAddress(library, "grpc_channel_credentials_release");
+  grpc_google_default_credentials_create_import = (grpc_google_default_credentials_create_type) GetProcAddress(library, "grpc_google_default_credentials_create");
+  grpc_ssl_credentials_create_import = (grpc_ssl_credentials_create_type) GetProcAddress(library, "grpc_ssl_credentials_create");
+  grpc_call_credentials_release_import = (grpc_call_credentials_release_type) GetProcAddress(library, "grpc_call_credentials_release");
+  grpc_composite_channel_credentials_create_import = (grpc_composite_channel_credentials_create_type) GetProcAddress(library, "grpc_composite_channel_credentials_create");
+  grpc_composite_call_credentials_create_import = (grpc_composite_call_credentials_create_type) GetProcAddress(library, "grpc_composite_call_credentials_create");
+  grpc_google_compute_engine_credentials_create_import = (grpc_google_compute_engine_credentials_create_type) GetProcAddress(library, "grpc_google_compute_engine_credentials_create");
+  grpc_max_auth_token_lifetime_import = (grpc_max_auth_token_lifetime_type) GetProcAddress(library, "grpc_max_auth_token_lifetime");
+  grpc_service_account_jwt_access_credentials_create_import = (grpc_service_account_jwt_access_credentials_create_type) GetProcAddress(library, "grpc_service_account_jwt_access_credentials_create");
+  grpc_google_refresh_token_credentials_create_import = (grpc_google_refresh_token_credentials_create_type) GetProcAddress(library, "grpc_google_refresh_token_credentials_create");
+  grpc_access_token_credentials_create_import = (grpc_access_token_credentials_create_type) GetProcAddress(library, "grpc_access_token_credentials_create");
+  grpc_google_iam_credentials_create_import = (grpc_google_iam_credentials_create_type) GetProcAddress(library, "grpc_google_iam_credentials_create");
+  grpc_metadata_credentials_create_from_plugin_import = (grpc_metadata_credentials_create_from_plugin_type) GetProcAddress(library, "grpc_metadata_credentials_create_from_plugin");
+  grpc_secure_channel_create_import = (grpc_secure_channel_create_type) GetProcAddress(library, "grpc_secure_channel_create");
+  grpc_server_credentials_release_import = (grpc_server_credentials_release_type) GetProcAddress(library, "grpc_server_credentials_release");
+  grpc_ssl_server_credentials_create_import = (grpc_ssl_server_credentials_create_type) GetProcAddress(library, "grpc_ssl_server_credentials_create");
+  grpc_server_add_secure_http2_port_import = (grpc_server_add_secure_http2_port_type) GetProcAddress(library, "grpc_server_add_secure_http2_port");
+  grpc_call_set_credentials_import = (grpc_call_set_credentials_type) GetProcAddress(library, "grpc_call_set_credentials");
+  grpc_server_credentials_set_auth_metadata_processor_import = (grpc_server_credentials_set_auth_metadata_processor_type) GetProcAddress(library, "grpc_server_credentials_set_auth_metadata_processor");
+  gpr_malloc_import = (gpr_malloc_type) GetProcAddress(library, "gpr_malloc");
+  gpr_free_import = (gpr_free_type) GetProcAddress(library, "gpr_free");
+  gpr_realloc_import = (gpr_realloc_type) GetProcAddress(library, "gpr_realloc");
+  gpr_malloc_aligned_import = (gpr_malloc_aligned_type) GetProcAddress(library, "gpr_malloc_aligned");
+  gpr_free_aligned_import = (gpr_free_aligned_type) GetProcAddress(library, "gpr_free_aligned");
+  gpr_set_allocation_functions_import = (gpr_set_allocation_functions_type) GetProcAddress(library, "gpr_set_allocation_functions");
+  gpr_get_allocation_functions_import = (gpr_get_allocation_functions_type) GetProcAddress(library, "gpr_get_allocation_functions");
+  grpc_raw_byte_buffer_create_import = (grpc_raw_byte_buffer_create_type) GetProcAddress(library, "grpc_raw_byte_buffer_create");
+  grpc_raw_compressed_byte_buffer_create_import = (grpc_raw_compressed_byte_buffer_create_type) GetProcAddress(library, "grpc_raw_compressed_byte_buffer_create");
+  grpc_byte_buffer_copy_import = (grpc_byte_buffer_copy_type) GetProcAddress(library, "grpc_byte_buffer_copy");
+  grpc_byte_buffer_length_import = (grpc_byte_buffer_length_type) GetProcAddress(library, "grpc_byte_buffer_length");
+  grpc_byte_buffer_destroy_import = (grpc_byte_buffer_destroy_type) GetProcAddress(library, "grpc_byte_buffer_destroy");
+  grpc_byte_buffer_reader_init_import = (grpc_byte_buffer_reader_init_type) GetProcAddress(library, "grpc_byte_buffer_reader_init");
+  grpc_byte_buffer_reader_destroy_import = (grpc_byte_buffer_reader_destroy_type) GetProcAddress(library, "grpc_byte_buffer_reader_destroy");
+  grpc_byte_buffer_reader_next_import = (grpc_byte_buffer_reader_next_type) GetProcAddress(library, "grpc_byte_buffer_reader_next");
+  grpc_byte_buffer_reader_readall_import = (grpc_byte_buffer_reader_readall_type) GetProcAddress(library, "grpc_byte_buffer_reader_readall");
+  grpc_raw_byte_buffer_from_reader_import = (grpc_raw_byte_buffer_from_reader_type) GetProcAddress(library, "grpc_raw_byte_buffer_from_reader");
+  gpr_log_import = (gpr_log_type) GetProcAddress(library, "gpr_log");
+  gpr_log_message_import = (gpr_log_message_type) GetProcAddress(library, "gpr_log_message");
+  gpr_set_log_function_import = (gpr_set_log_function_type) GetProcAddress(library, "gpr_set_log_function");
+  gpr_slice_ref_import = (gpr_slice_ref_type) GetProcAddress(library, "gpr_slice_ref");
+  gpr_slice_unref_import = (gpr_slice_unref_type) GetProcAddress(library, "gpr_slice_unref");
+  gpr_slice_new_import = (gpr_slice_new_type) GetProcAddress(library, "gpr_slice_new");
+  gpr_slice_new_with_len_import = (gpr_slice_new_with_len_type) GetProcAddress(library, "gpr_slice_new_with_len");
+  gpr_slice_malloc_import = (gpr_slice_malloc_type) GetProcAddress(library, "gpr_slice_malloc");
+  gpr_slice_from_copied_string_import = (gpr_slice_from_copied_string_type) GetProcAddress(library, "gpr_slice_from_copied_string");
+  gpr_slice_from_copied_buffer_import = (gpr_slice_from_copied_buffer_type) GetProcAddress(library, "gpr_slice_from_copied_buffer");
+  gpr_slice_from_static_string_import = (gpr_slice_from_static_string_type) GetProcAddress(library, "gpr_slice_from_static_string");
+  gpr_slice_sub_import = (gpr_slice_sub_type) GetProcAddress(library, "gpr_slice_sub");
+  gpr_slice_sub_no_ref_import = (gpr_slice_sub_no_ref_type) GetProcAddress(library, "gpr_slice_sub_no_ref");
+  gpr_slice_split_tail_import = (gpr_slice_split_tail_type) GetProcAddress(library, "gpr_slice_split_tail");
+  gpr_slice_split_head_import = (gpr_slice_split_head_type) GetProcAddress(library, "gpr_slice_split_head");
+  gpr_empty_slice_import = (gpr_empty_slice_type) GetProcAddress(library, "gpr_empty_slice");
+  gpr_slice_cmp_import = (gpr_slice_cmp_type) GetProcAddress(library, "gpr_slice_cmp");
+  gpr_slice_str_cmp_import = (gpr_slice_str_cmp_type) GetProcAddress(library, "gpr_slice_str_cmp");
+  gpr_slice_buffer_init_import = (gpr_slice_buffer_init_type) GetProcAddress(library, "gpr_slice_buffer_init");
+  gpr_slice_buffer_destroy_import = (gpr_slice_buffer_destroy_type) GetProcAddress(library, "gpr_slice_buffer_destroy");
+  gpr_slice_buffer_add_import = (gpr_slice_buffer_add_type) GetProcAddress(library, "gpr_slice_buffer_add");
+  gpr_slice_buffer_add_indexed_import = (gpr_slice_buffer_add_indexed_type) GetProcAddress(library, "gpr_slice_buffer_add_indexed");
+  gpr_slice_buffer_addn_import = (gpr_slice_buffer_addn_type) GetProcAddress(library, "gpr_slice_buffer_addn");
+  gpr_slice_buffer_tiny_add_import = (gpr_slice_buffer_tiny_add_type) GetProcAddress(library, "gpr_slice_buffer_tiny_add");
+  gpr_slice_buffer_pop_import = (gpr_slice_buffer_pop_type) GetProcAddress(library, "gpr_slice_buffer_pop");
+  gpr_slice_buffer_reset_and_unref_import = (gpr_slice_buffer_reset_and_unref_type) GetProcAddress(library, "gpr_slice_buffer_reset_and_unref");
+  gpr_slice_buffer_swap_import = (gpr_slice_buffer_swap_type) GetProcAddress(library, "gpr_slice_buffer_swap");
+  gpr_slice_buffer_move_into_import = (gpr_slice_buffer_move_into_type) GetProcAddress(library, "gpr_slice_buffer_move_into");
+  gpr_slice_buffer_trim_end_import = (gpr_slice_buffer_trim_end_type) GetProcAddress(library, "gpr_slice_buffer_trim_end");
+  gpr_slice_buffer_move_first_import = (gpr_slice_buffer_move_first_type) GetProcAddress(library, "gpr_slice_buffer_move_first");
+  gpr_slice_buffer_take_first_import = (gpr_slice_buffer_take_first_type) GetProcAddress(library, "gpr_slice_buffer_take_first");
+  gpr_mu_init_import = (gpr_mu_init_type) GetProcAddress(library, "gpr_mu_init");
+  gpr_mu_destroy_import = (gpr_mu_destroy_type) GetProcAddress(library, "gpr_mu_destroy");
+  gpr_mu_lock_import = (gpr_mu_lock_type) GetProcAddress(library, "gpr_mu_lock");
+  gpr_mu_unlock_import = (gpr_mu_unlock_type) GetProcAddress(library, "gpr_mu_unlock");
+  gpr_mu_trylock_import = (gpr_mu_trylock_type) GetProcAddress(library, "gpr_mu_trylock");
+  gpr_cv_init_import = (gpr_cv_init_type) GetProcAddress(library, "gpr_cv_init");
+  gpr_cv_destroy_import = (gpr_cv_destroy_type) GetProcAddress(library, "gpr_cv_destroy");
+  gpr_cv_wait_import = (gpr_cv_wait_type) GetProcAddress(library, "gpr_cv_wait");
+  gpr_cv_signal_import = (gpr_cv_signal_type) GetProcAddress(library, "gpr_cv_signal");
+  gpr_cv_broadcast_import = (gpr_cv_broadcast_type) GetProcAddress(library, "gpr_cv_broadcast");
+  gpr_once_init_import = (gpr_once_init_type) GetProcAddress(library, "gpr_once_init");
+  gpr_event_init_import = (gpr_event_init_type) GetProcAddress(library, "gpr_event_init");
+  gpr_event_set_import = (gpr_event_set_type) GetProcAddress(library, "gpr_event_set");
+  gpr_event_get_import = (gpr_event_get_type) GetProcAddress(library, "gpr_event_get");
+  gpr_event_wait_import = (gpr_event_wait_type) GetProcAddress(library, "gpr_event_wait");
+  gpr_ref_init_import = (gpr_ref_init_type) GetProcAddress(library, "gpr_ref_init");
+  gpr_ref_import = (gpr_ref_type) GetProcAddress(library, "gpr_ref");
+  gpr_refn_import = (gpr_refn_type) GetProcAddress(library, "gpr_refn");
+  gpr_unref_import = (gpr_unref_type) GetProcAddress(library, "gpr_unref");
+  gpr_stats_init_import = (gpr_stats_init_type) GetProcAddress(library, "gpr_stats_init");
+  gpr_stats_inc_import = (gpr_stats_inc_type) GetProcAddress(library, "gpr_stats_inc");
+  gpr_stats_read_import = (gpr_stats_read_type) GetProcAddress(library, "gpr_stats_read");
+  gpr_time_0_import = (gpr_time_0_type) GetProcAddress(library, "gpr_time_0");
+  gpr_inf_future_import = (gpr_inf_future_type) GetProcAddress(library, "gpr_inf_future");
+  gpr_inf_past_import = (gpr_inf_past_type) GetProcAddress(library, "gpr_inf_past");
+  gpr_time_init_import = (gpr_time_init_type) GetProcAddress(library, "gpr_time_init");
+  gpr_now_import = (gpr_now_type) GetProcAddress(library, "gpr_now");
+  gpr_convert_clock_type_import = (gpr_convert_clock_type_type) GetProcAddress(library, "gpr_convert_clock_type");
+  gpr_time_cmp_import = (gpr_time_cmp_type) GetProcAddress(library, "gpr_time_cmp");
+  gpr_time_max_import = (gpr_time_max_type) GetProcAddress(library, "gpr_time_max");
+  gpr_time_min_import = (gpr_time_min_type) GetProcAddress(library, "gpr_time_min");
+  gpr_time_add_import = (gpr_time_add_type) GetProcAddress(library, "gpr_time_add");
+  gpr_time_sub_import = (gpr_time_sub_type) GetProcAddress(library, "gpr_time_sub");
+  gpr_time_from_micros_import = (gpr_time_from_micros_type) GetProcAddress(library, "gpr_time_from_micros");
+  gpr_time_from_nanos_import = (gpr_time_from_nanos_type) GetProcAddress(library, "gpr_time_from_nanos");
+  gpr_time_from_millis_import = (gpr_time_from_millis_type) GetProcAddress(library, "gpr_time_from_millis");
+  gpr_time_from_seconds_import = (gpr_time_from_seconds_type) GetProcAddress(library, "gpr_time_from_seconds");
+  gpr_time_from_minutes_import = (gpr_time_from_minutes_type) GetProcAddress(library, "gpr_time_from_minutes");
+  gpr_time_from_hours_import = (gpr_time_from_hours_type) GetProcAddress(library, "gpr_time_from_hours");
+  gpr_time_to_millis_import = (gpr_time_to_millis_type) GetProcAddress(library, "gpr_time_to_millis");
+  gpr_time_similar_import = (gpr_time_similar_type) GetProcAddress(library, "gpr_time_similar");
+  gpr_sleep_until_import = (gpr_sleep_until_type) GetProcAddress(library, "gpr_sleep_until");
+  gpr_timespec_to_micros_import = (gpr_timespec_to_micros_type) GetProcAddress(library, "gpr_timespec_to_micros");
+  gpr_avl_create_import = (gpr_avl_create_type) GetProcAddress(library, "gpr_avl_create");
+  gpr_avl_ref_import = (gpr_avl_ref_type) GetProcAddress(library, "gpr_avl_ref");
+  gpr_avl_unref_import = (gpr_avl_unref_type) GetProcAddress(library, "gpr_avl_unref");
+  gpr_avl_add_import = (gpr_avl_add_type) GetProcAddress(library, "gpr_avl_add");
+  gpr_avl_remove_import = (gpr_avl_remove_type) GetProcAddress(library, "gpr_avl_remove");
+  gpr_avl_get_import = (gpr_avl_get_type) GetProcAddress(library, "gpr_avl_get");
+  gpr_cmdline_create_import = (gpr_cmdline_create_type) GetProcAddress(library, "gpr_cmdline_create");
+  gpr_cmdline_add_int_import = (gpr_cmdline_add_int_type) GetProcAddress(library, "gpr_cmdline_add_int");
+  gpr_cmdline_add_flag_import = (gpr_cmdline_add_flag_type) GetProcAddress(library, "gpr_cmdline_add_flag");
+  gpr_cmdline_add_string_import = (gpr_cmdline_add_string_type) GetProcAddress(library, "gpr_cmdline_add_string");
+  gpr_cmdline_on_extra_arg_import = (gpr_cmdline_on_extra_arg_type) GetProcAddress(library, "gpr_cmdline_on_extra_arg");
+  gpr_cmdline_set_survive_failure_import = (gpr_cmdline_set_survive_failure_type) GetProcAddress(library, "gpr_cmdline_set_survive_failure");
+  gpr_cmdline_parse_import = (gpr_cmdline_parse_type) GetProcAddress(library, "gpr_cmdline_parse");
+  gpr_cmdline_destroy_import = (gpr_cmdline_destroy_type) GetProcAddress(library, "gpr_cmdline_destroy");
+  gpr_cmdline_usage_string_import = (gpr_cmdline_usage_string_type) GetProcAddress(library, "gpr_cmdline_usage_string");
+  gpr_cpu_num_cores_import = (gpr_cpu_num_cores_type) GetProcAddress(library, "gpr_cpu_num_cores");
+  gpr_cpu_current_cpu_import = (gpr_cpu_current_cpu_type) GetProcAddress(library, "gpr_cpu_current_cpu");
+  gpr_histogram_create_import = (gpr_histogram_create_type) GetProcAddress(library, "gpr_histogram_create");
+  gpr_histogram_destroy_import = (gpr_histogram_destroy_type) GetProcAddress(library, "gpr_histogram_destroy");
+  gpr_histogram_add_import = (gpr_histogram_add_type) GetProcAddress(library, "gpr_histogram_add");
+  gpr_histogram_merge_import = (gpr_histogram_merge_type) GetProcAddress(library, "gpr_histogram_merge");
+  gpr_histogram_percentile_import = (gpr_histogram_percentile_type) GetProcAddress(library, "gpr_histogram_percentile");
+  gpr_histogram_mean_import = (gpr_histogram_mean_type) GetProcAddress(library, "gpr_histogram_mean");
+  gpr_histogram_stddev_import = (gpr_histogram_stddev_type) GetProcAddress(library, "gpr_histogram_stddev");
+  gpr_histogram_variance_import = (gpr_histogram_variance_type) GetProcAddress(library, "gpr_histogram_variance");
+  gpr_histogram_maximum_import = (gpr_histogram_maximum_type) GetProcAddress(library, "gpr_histogram_maximum");
+  gpr_histogram_minimum_import = (gpr_histogram_minimum_type) GetProcAddress(library, "gpr_histogram_minimum");
+  gpr_histogram_count_import = (gpr_histogram_count_type) GetProcAddress(library, "gpr_histogram_count");
+  gpr_histogram_sum_import = (gpr_histogram_sum_type) GetProcAddress(library, "gpr_histogram_sum");
+  gpr_histogram_sum_of_squares_import = (gpr_histogram_sum_of_squares_type) GetProcAddress(library, "gpr_histogram_sum_of_squares");
+  gpr_histogram_get_contents_import = (gpr_histogram_get_contents_type) GetProcAddress(library, "gpr_histogram_get_contents");
+  gpr_histogram_merge_contents_import = (gpr_histogram_merge_contents_type) GetProcAddress(library, "gpr_histogram_merge_contents");
+  gpr_join_host_port_import = (gpr_join_host_port_type) GetProcAddress(library, "gpr_join_host_port");
+  gpr_split_host_port_import = (gpr_split_host_port_type) GetProcAddress(library, "gpr_split_host_port");
+  gpr_format_message_import = (gpr_format_message_type) GetProcAddress(library, "gpr_format_message");
+  gpr_strdup_import = (gpr_strdup_type) GetProcAddress(library, "gpr_strdup");
+  gpr_asprintf_import = (gpr_asprintf_type) GetProcAddress(library, "gpr_asprintf");
+  gpr_subprocess_binary_extension_import = (gpr_subprocess_binary_extension_type) GetProcAddress(library, "gpr_subprocess_binary_extension");
+  gpr_subprocess_create_import = (gpr_subprocess_create_type) GetProcAddress(library, "gpr_subprocess_create");
+  gpr_subprocess_destroy_import = (gpr_subprocess_destroy_type) GetProcAddress(library, "gpr_subprocess_destroy");
+  gpr_subprocess_join_import = (gpr_subprocess_join_type) GetProcAddress(library, "gpr_subprocess_join");
+  gpr_subprocess_interrupt_import = (gpr_subprocess_interrupt_type) GetProcAddress(library, "gpr_subprocess_interrupt");
+  gpr_thd_new_import = (gpr_thd_new_type) GetProcAddress(library, "gpr_thd_new");
+  gpr_thd_options_default_import = (gpr_thd_options_default_type) GetProcAddress(library, "gpr_thd_options_default");
+  gpr_thd_options_set_detached_import = (gpr_thd_options_set_detached_type) GetProcAddress(library, "gpr_thd_options_set_detached");
+  gpr_thd_options_set_joinable_import = (gpr_thd_options_set_joinable_type) GetProcAddress(library, "gpr_thd_options_set_joinable");
+  gpr_thd_options_is_detached_import = (gpr_thd_options_is_detached_type) GetProcAddress(library, "gpr_thd_options_is_detached");
+  gpr_thd_options_is_joinable_import = (gpr_thd_options_is_joinable_type) GetProcAddress(library, "gpr_thd_options_is_joinable");
+  gpr_thd_currentid_import = (gpr_thd_currentid_type) GetProcAddress(library, "gpr_thd_currentid");
+  gpr_thd_join_import = (gpr_thd_join_type) GetProcAddress(library, "gpr_thd_join");
+}
+
+#endif /* !GPR_WIN32 */
diff --git a/src/python/grpcio/grpc/_cython/imports.generated.h b/src/python/grpcio/grpc/_cython/imports.generated.h
new file mode 100644
index 0000000000..2a8a910055
--- /dev/null
+++ b/src/python/grpcio/grpc/_cython/imports.generated.h
@@ -0,0 +1,860 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef PYGRPC_CYTHON_WINDOWS_IMPORTS_H_
+#define PYGRPC_CYTHON_WINDOWS_IMPORTS_H_
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_WIN32
+
+#include <windows.h>
+
+#include <grpc/census.h>
+#include <grpc/compression.h>
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
+#include <grpc/impl/codegen/alloc.h>
+#include <grpc/impl/codegen/byte_buffer.h>
+#include <grpc/impl/codegen/log.h>
+#include <grpc/impl/codegen/slice.h>
+#include <grpc/impl/codegen/slice_buffer.h>
+#include <grpc/impl/codegen/sync.h>
+#include <grpc/impl/codegen/time.h>
+#include <grpc/support/avl.h>
+#include <grpc/support/cmdline.h>
+#include <grpc/support/cpu.h>
+#include <grpc/support/histogram.h>
+#include <grpc/support/host_port.h>
+#include <grpc/support/log_win32.h>
+#include <grpc/support/string_util.h>
+#include <grpc/support/subprocess.h>
+#include <grpc/support/thd.h>
+
+typedef int(*census_initialize_type)(int features);
+extern census_initialize_type census_initialize_import;
+#define census_initialize census_initialize_import
+typedef void(*census_shutdown_type)(void);
+extern census_shutdown_type census_shutdown_import;
+#define census_shutdown census_shutdown_import
+typedef int(*census_supported_type)(void);
+extern census_supported_type census_supported_import;
+#define census_supported census_supported_import
+typedef int(*census_enabled_type)(void);
+extern census_enabled_type census_enabled_import;
+#define census_enabled census_enabled_import
+typedef size_t(*census_context_serialize_type)(const census_context *context, char *buffer, size_t buf_size);
+extern census_context_serialize_type census_context_serialize_import;
+#define census_context_serialize census_context_serialize_import
+typedef int(*census_trace_mask_type)(const census_context *context);
+extern census_trace_mask_type census_trace_mask_import;
+#define census_trace_mask census_trace_mask_import
+typedef void(*census_set_trace_mask_type)(int trace_mask);
+extern census_set_trace_mask_type census_set_trace_mask_import;
+#define census_set_trace_mask census_set_trace_mask_import
+typedef census_timestamp(*census_start_rpc_op_timestamp_type)(void);
+extern census_start_rpc_op_timestamp_type census_start_rpc_op_timestamp_import;
+#define census_start_rpc_op_timestamp census_start_rpc_op_timestamp_import
+typedef census_context *(*census_start_client_rpc_op_type)(const census_context *context, int64_t rpc_name_id, const census_rpc_name_info *rpc_name_info, const char *peer, int trace_mask, const census_timestamp *start_time);
+extern census_start_client_rpc_op_type census_start_client_rpc_op_import;
+#define census_start_client_rpc_op census_start_client_rpc_op_import
+typedef void(*census_set_rpc_client_peer_type)(census_context *context, const char *peer);
+extern census_set_rpc_client_peer_type census_set_rpc_client_peer_import;
+#define census_set_rpc_client_peer census_set_rpc_client_peer_import
+typedef census_context *(*census_start_server_rpc_op_type)(const char *buffer, int64_t rpc_name_id, const census_rpc_name_info *rpc_name_info, const char *peer, int trace_mask, census_timestamp *start_time);
+extern census_start_server_rpc_op_type census_start_server_rpc_op_import;
+#define census_start_server_rpc_op census_start_server_rpc_op_import
+typedef census_context *(*census_start_op_type)(census_context *context, const char *family, const char *name, int trace_mask);
+extern census_start_op_type census_start_op_import;
+#define census_start_op census_start_op_import
+typedef void(*census_end_op_type)(census_context *context, int status);
+extern census_end_op_type census_end_op_import;
+#define census_end_op census_end_op_import
+typedef void(*census_trace_print_type)(census_context *context, uint32_t type, const char *buffer, size_t n);
+extern census_trace_print_type census_trace_print_import;
+#define census_trace_print census_trace_print_import
+typedef int(*census_trace_scan_start_type)(int consume);
+extern census_trace_scan_start_type census_trace_scan_start_import;
+#define census_trace_scan_start census_trace_scan_start_import
+typedef int(*census_get_trace_record_type)(census_trace_record *trace_record);
+extern census_get_trace_record_type census_get_trace_record_import;
+#define census_get_trace_record census_get_trace_record_import
+typedef void(*census_trace_scan_end_type)();
+extern census_trace_scan_end_type census_trace_scan_end_import;
+#define census_trace_scan_end census_trace_scan_end_import
+typedef census_tag_set *(*census_tag_set_create_type)(const census_tag_set *base, const census_tag *tags, int ntags, census_tag_set_create_status const **status);
+extern census_tag_set_create_type census_tag_set_create_import;
+#define census_tag_set_create census_tag_set_create_import
+typedef void(*census_tag_set_destroy_type)(census_tag_set *tags);
+extern census_tag_set_destroy_type census_tag_set_destroy_import;
+#define census_tag_set_destroy census_tag_set_destroy_import
+typedef const census_tag_set_create_status *(*census_tag_set_get_create_status_type)(const census_tag_set *tags);
+extern census_tag_set_get_create_status_type census_tag_set_get_create_status_import;
+#define census_tag_set_get_create_status census_tag_set_get_create_status_import
+typedef void(*census_tag_set_initialize_iterator_type)(const census_tag_set *tags, census_tag_set_iterator *iterator);
+extern census_tag_set_initialize_iterator_type census_tag_set_initialize_iterator_import;
+#define census_tag_set_initialize_iterator census_tag_set_initialize_iterator_import
+typedef int(*census_tag_set_next_tag_type)(census_tag_set_iterator *iterator, census_tag *tag);
+extern census_tag_set_next_tag_type census_tag_set_next_tag_import;
+#define census_tag_set_next_tag census_tag_set_next_tag_import
+typedef int(*census_tag_set_get_tag_by_key_type)(const census_tag_set *tags, const char *key, census_tag *tag);
+extern census_tag_set_get_tag_by_key_type census_tag_set_get_tag_by_key_import;
+#define census_tag_set_get_tag_by_key census_tag_set_get_tag_by_key_import
+typedef char *(*census_tag_set_encode_type)(const census_tag_set *tags, char *buffer, size_t buf_size, size_t *print_buf_size, size_t *bin_buf_size);
+extern census_tag_set_encode_type census_tag_set_encode_import;
+#define census_tag_set_encode census_tag_set_encode_import
+typedef census_tag_set *(*census_tag_set_decode_type)(const char *buffer, size_t size, const char *bin_buffer, size_t bin_size);
+extern census_tag_set_decode_type census_tag_set_decode_import;
+#define census_tag_set_decode census_tag_set_decode_import
+typedef census_tag_set *(*census_context_tag_set_type)(census_context *context);
+extern census_context_tag_set_type census_context_tag_set_import;
+#define census_context_tag_set census_context_tag_set_import
+typedef void(*census_record_values_type)(census_context *context, census_value *values, size_t nvalues);
+extern census_record_values_type census_record_values_import;
+#define census_record_values census_record_values_import
+typedef census_view *(*census_view_create_type)(uint32_t metric_id, const census_tag_set *tags, const census_aggregation *aggregations, size_t naggregations);
+extern census_view_create_type census_view_create_import;
+#define census_view_create census_view_create_import
+typedef void(*census_view_delete_type)(census_view *view);
+extern census_view_delete_type census_view_delete_import;
+#define census_view_delete census_view_delete_import
+typedef size_t(*census_view_metric_type)(const census_view *view);
+extern census_view_metric_type census_view_metric_import;
+#define census_view_metric census_view_metric_import
+typedef size_t(*census_view_naggregations_type)(const census_view *view);
+extern census_view_naggregations_type census_view_naggregations_import;
+#define census_view_naggregations census_view_naggregations_import
+typedef const census_tag_set *(*census_view_tags_type)(const census_view *view);
+extern census_view_tags_type census_view_tags_import;
+#define census_view_tags census_view_tags_import
+typedef const census_aggregation *(*census_view_aggregrations_type)(const census_view *view);
+extern census_view_aggregrations_type census_view_aggregrations_import;
+#define census_view_aggregrations census_view_aggregrations_import
+typedef const census_view_data *(*census_view_get_data_type)(const census_view *view);
+extern census_view_get_data_type census_view_get_data_import;
+#define census_view_get_data census_view_get_data_import
+typedef void(*census_view_reset_type)(census_view *view);
+extern census_view_reset_type census_view_reset_import;
+#define census_view_reset census_view_reset_import
+typedef int(*grpc_compression_algorithm_parse_type)(const char *name, size_t name_length, grpc_compression_algorithm *algorithm);
+extern grpc_compression_algorithm_parse_type grpc_compression_algorithm_parse_import;
+#define grpc_compression_algorithm_parse grpc_compression_algorithm_parse_import
+typedef int(*grpc_compression_algorithm_name_type)(grpc_compression_algorithm algorithm, char **name);
+extern grpc_compression_algorithm_name_type grpc_compression_algorithm_name_import;
+#define grpc_compression_algorithm_name grpc_compression_algorithm_name_import
+typedef grpc_compression_algorithm(*grpc_compression_algorithm_for_level_type)(grpc_compression_level level);
+extern grpc_compression_algorithm_for_level_type grpc_compression_algorithm_for_level_import;
+#define grpc_compression_algorithm_for_level grpc_compression_algorithm_for_level_import
+typedef void(*grpc_compression_options_init_type)(grpc_compression_options *opts);
+extern grpc_compression_options_init_type grpc_compression_options_init_import;
+#define grpc_compression_options_init grpc_compression_options_init_import
+typedef void(*grpc_compression_options_enable_algorithm_type)(grpc_compression_options *opts, grpc_compression_algorithm algorithm);
+extern grpc_compression_options_enable_algorithm_type grpc_compression_options_enable_algorithm_import;
+#define grpc_compression_options_enable_algorithm grpc_compression_options_enable_algorithm_import
+typedef void(*grpc_compression_options_disable_algorithm_type)(grpc_compression_options *opts, grpc_compression_algorithm algorithm);
+extern grpc_compression_options_disable_algorithm_type grpc_compression_options_disable_algorithm_import;
+#define grpc_compression_options_disable_algorithm grpc_compression_options_disable_algorithm_import
+typedef int(*grpc_compression_options_is_algorithm_enabled_type)(const grpc_compression_options *opts, grpc_compression_algorithm algorithm);
+extern grpc_compression_options_is_algorithm_enabled_type grpc_compression_options_is_algorithm_enabled_import;
+#define grpc_compression_options_is_algorithm_enabled grpc_compression_options_is_algorithm_enabled_import
+typedef void(*grpc_metadata_array_init_type)(grpc_metadata_array *array);
+extern grpc_metadata_array_init_type grpc_metadata_array_init_import;
+#define grpc_metadata_array_init grpc_metadata_array_init_import
+typedef void(*grpc_metadata_array_destroy_type)(grpc_metadata_array *array);
+extern grpc_metadata_array_destroy_type grpc_metadata_array_destroy_import;
+#define grpc_metadata_array_destroy grpc_metadata_array_destroy_import
+typedef void(*grpc_call_details_init_type)(grpc_call_details *details);
+extern grpc_call_details_init_type grpc_call_details_init_import;
+#define grpc_call_details_init grpc_call_details_init_import
+typedef void(*grpc_call_details_destroy_type)(grpc_call_details *details);
+extern grpc_call_details_destroy_type grpc_call_details_destroy_import;
+#define grpc_call_details_destroy grpc_call_details_destroy_import
+typedef void(*grpc_register_plugin_type)(void (*init)(void), void (*destroy)(void));
+extern grpc_register_plugin_type grpc_register_plugin_import;
+#define grpc_register_plugin grpc_register_plugin_import
+typedef void(*grpc_init_type)(void);
+extern grpc_init_type grpc_init_import;
+#define grpc_init grpc_init_import
+typedef void(*grpc_shutdown_type)(void);
+extern grpc_shutdown_type grpc_shutdown_import;
+#define grpc_shutdown grpc_shutdown_import
+typedef const char *(*grpc_version_string_type)(void);
+extern grpc_version_string_type grpc_version_string_import;
+#define grpc_version_string grpc_version_string_import
+typedef grpc_completion_queue *(*grpc_completion_queue_create_type)(void *reserved);
+extern grpc_completion_queue_create_type grpc_completion_queue_create_import;
+#define grpc_completion_queue_create grpc_completion_queue_create_import
+typedef grpc_event(*grpc_completion_queue_next_type)(grpc_completion_queue *cq, gpr_timespec deadline, void *reserved);
+extern grpc_completion_queue_next_type grpc_completion_queue_next_import;
+#define grpc_completion_queue_next grpc_completion_queue_next_import
+typedef grpc_event(*grpc_completion_queue_pluck_type)(grpc_completion_queue *cq, void *tag, gpr_timespec deadline, void *reserved);
+extern grpc_completion_queue_pluck_type grpc_completion_queue_pluck_import;
+#define grpc_completion_queue_pluck grpc_completion_queue_pluck_import
+typedef void(*grpc_completion_queue_shutdown_type)(grpc_completion_queue *cq);
+extern grpc_completion_queue_shutdown_type grpc_completion_queue_shutdown_import;
+#define grpc_completion_queue_shutdown grpc_completion_queue_shutdown_import
+typedef void(*grpc_completion_queue_destroy_type)(grpc_completion_queue *cq);
+extern grpc_completion_queue_destroy_type grpc_completion_queue_destroy_import;
+#define grpc_completion_queue_destroy grpc_completion_queue_destroy_import
+typedef grpc_alarm *(*grpc_alarm_create_type)(grpc_completion_queue *cq, gpr_timespec deadline, void *tag);
+extern grpc_alarm_create_type grpc_alarm_create_import;
+#define grpc_alarm_create grpc_alarm_create_import
+typedef void(*grpc_alarm_cancel_type)(grpc_alarm *alarm);
+extern grpc_alarm_cancel_type grpc_alarm_cancel_import;
+#define grpc_alarm_cancel grpc_alarm_cancel_import
+typedef void(*grpc_alarm_destroy_type)(grpc_alarm *alarm);
+extern grpc_alarm_destroy_type grpc_alarm_destroy_import;
+#define grpc_alarm_destroy grpc_alarm_destroy_import
+typedef grpc_connectivity_state(*grpc_channel_check_connectivity_state_type)(grpc_channel *channel, int try_to_connect);
+extern grpc_channel_check_connectivity_state_type grpc_channel_check_connectivity_state_import;
+#define grpc_channel_check_connectivity_state grpc_channel_check_connectivity_state_import
+typedef void(*grpc_channel_watch_connectivity_state_type)(grpc_channel *channel, grpc_connectivity_state last_observed_state, gpr_timespec deadline, grpc_completion_queue *cq, void *tag);
+extern grpc_channel_watch_connectivity_state_type grpc_channel_watch_connectivity_state_import;
+#define grpc_channel_watch_connectivity_state grpc_channel_watch_connectivity_state_import
+typedef grpc_call *(*grpc_channel_create_call_type)(grpc_channel *channel, grpc_call *parent_call, uint32_t propagation_mask, grpc_completion_queue *completion_queue, const char *method, const char *host, gpr_timespec deadline, void *reserved);
+extern grpc_channel_create_call_type grpc_channel_create_call_import;
+#define grpc_channel_create_call grpc_channel_create_call_import
+typedef void(*grpc_channel_ping_type)(grpc_channel *channel, grpc_completion_queue *cq, void *tag, void *reserved);
+extern grpc_channel_ping_type grpc_channel_ping_import;
+#define grpc_channel_ping grpc_channel_ping_import
+typedef void *(*grpc_channel_register_call_type)(grpc_channel *channel, const char *method, const char *host, void *reserved);
+extern grpc_channel_register_call_type grpc_channel_register_call_import;
+#define grpc_channel_register_call grpc_channel_register_call_import
+typedef grpc_call *(*grpc_channel_create_registered_call_type)(grpc_channel *channel, grpc_call *parent_call, uint32_t propagation_mask, grpc_completion_queue *completion_queue, void *registered_call_handle, gpr_timespec deadline, void *reserved);
+extern grpc_channel_create_registered_call_type grpc_channel_create_registered_call_import;
+#define grpc_channel_create_registered_call grpc_channel_create_registered_call_import
+typedef grpc_call_error(*grpc_call_start_batch_type)(grpc_call *call, const grpc_op *ops, size_t nops, void *tag, void *reserved);
+extern grpc_call_start_batch_type grpc_call_start_batch_import;
+#define grpc_call_start_batch grpc_call_start_batch_import
+typedef char *(*grpc_call_get_peer_type)(grpc_call *call);
+extern grpc_call_get_peer_type grpc_call_get_peer_import;
+#define grpc_call_get_peer grpc_call_get_peer_import
+typedef void(*grpc_census_call_set_context_type)(grpc_call *call, struct census_context *context);
+extern grpc_census_call_set_context_type grpc_census_call_set_context_import;
+#define grpc_census_call_set_context grpc_census_call_set_context_import
+typedef struct census_context *(*grpc_census_call_get_context_type)(grpc_call *call);
+extern grpc_census_call_get_context_type grpc_census_call_get_context_import;
+#define grpc_census_call_get_context grpc_census_call_get_context_import
+typedef char *(*grpc_channel_get_target_type)(grpc_channel *channel);
+extern grpc_channel_get_target_type grpc_channel_get_target_import;
+#define grpc_channel_get_target grpc_channel_get_target_import
+typedef grpc_channel *(*grpc_insecure_channel_create_type)(const char *target, const grpc_channel_args *args, void *reserved);
+extern grpc_insecure_channel_create_type grpc_insecure_channel_create_import;
+#define grpc_insecure_channel_create grpc_insecure_channel_create_import
+typedef grpc_channel *(*grpc_lame_client_channel_create_type)(const char *target, grpc_status_code error_code, const char *error_message);
+extern grpc_lame_client_channel_create_type grpc_lame_client_channel_create_import;
+#define grpc_lame_client_channel_create grpc_lame_client_channel_create_import
+typedef void(*grpc_channel_destroy_type)(grpc_channel *channel);
+extern grpc_channel_destroy_type grpc_channel_destroy_import;
+#define grpc_channel_destroy grpc_channel_destroy_import
+typedef grpc_call_error(*grpc_call_cancel_type)(grpc_call *call, void *reserved);
+extern grpc_call_cancel_type grpc_call_cancel_import;
+#define grpc_call_cancel grpc_call_cancel_import
+typedef grpc_call_error(*grpc_call_cancel_with_status_type)(grpc_call *call, grpc_status_code status, const char *description, void *reserved);
+extern grpc_call_cancel_with_status_type grpc_call_cancel_with_status_import;
+#define grpc_call_cancel_with_status grpc_call_cancel_with_status_import
+typedef void(*grpc_call_destroy_type)(grpc_call *call);
+extern grpc_call_destroy_type grpc_call_destroy_import;
+#define grpc_call_destroy grpc_call_destroy_import
+typedef grpc_call_error(*grpc_server_request_call_type)(grpc_server *server, grpc_call **call, grpc_call_details *details, grpc_metadata_array *request_metadata, grpc_completion_queue *cq_bound_to_call, grpc_completion_queue *cq_for_notification, void *tag_new);
+extern grpc_server_request_call_type grpc_server_request_call_import;
+#define grpc_server_request_call grpc_server_request_call_import
+typedef void *(*grpc_server_register_method_type)(grpc_server *server, const char *method, const char *host);
+extern grpc_server_register_method_type grpc_server_register_method_import;
+#define grpc_server_register_method grpc_server_register_method_import
+typedef grpc_call_error(*grpc_server_request_registered_call_type)(grpc_server *server, void *registered_method, grpc_call **call, gpr_timespec *deadline, grpc_metadata_array *request_metadata, grpc_byte_buffer **optional_payload, grpc_completion_queue *cq_bound_to_call, grpc_completion_queue *cq_for_notification, void *tag_new);
+extern grpc_server_request_registered_call_type grpc_server_request_registered_call_import;
+#define grpc_server_request_registered_call grpc_server_request_registered_call_import
+typedef grpc_server *(*grpc_server_create_type)(const grpc_channel_args *args, void *reserved);
+extern grpc_server_create_type grpc_server_create_import;
+#define grpc_server_create grpc_server_create_import
+typedef void(*grpc_server_register_completion_queue_type)(grpc_server *server, grpc_completion_queue *cq, void *reserved);
+extern grpc_server_register_completion_queue_type grpc_server_register_completion_queue_import;
+#define grpc_server_register_completion_queue grpc_server_register_completion_queue_import
+typedef int(*grpc_server_add_insecure_http2_port_type)(grpc_server *server, const char *addr);
+extern grpc_server_add_insecure_http2_port_type grpc_server_add_insecure_http2_port_import;
+#define grpc_server_add_insecure_http2_port grpc_server_add_insecure_http2_port_import
+typedef void(*grpc_server_start_type)(grpc_server *server);
+extern grpc_server_start_type grpc_server_start_import;
+#define grpc_server_start grpc_server_start_import
+typedef void(*grpc_server_shutdown_and_notify_type)(grpc_server *server, grpc_completion_queue *cq, void *tag);
+extern grpc_server_shutdown_and_notify_type grpc_server_shutdown_and_notify_import;
+#define grpc_server_shutdown_and_notify grpc_server_shutdown_and_notify_import
+typedef void(*grpc_server_cancel_all_calls_type)(grpc_server *server);
+extern grpc_server_cancel_all_calls_type grpc_server_cancel_all_calls_import;
+#define grpc_server_cancel_all_calls grpc_server_cancel_all_calls_import
+typedef void(*grpc_server_destroy_type)(grpc_server *server);
+extern grpc_server_destroy_type grpc_server_destroy_import;
+#define grpc_server_destroy grpc_server_destroy_import
+typedef int(*grpc_tracer_set_enabled_type)(const char *name, int enabled);
+extern grpc_tracer_set_enabled_type grpc_tracer_set_enabled_import;
+#define grpc_tracer_set_enabled grpc_tracer_set_enabled_import
+typedef int(*grpc_header_key_is_legal_type)(const char *key, size_t length);
+extern grpc_header_key_is_legal_type grpc_header_key_is_legal_import;
+#define grpc_header_key_is_legal grpc_header_key_is_legal_import
+typedef int(*grpc_header_nonbin_value_is_legal_type)(const char *value, size_t length);
+extern grpc_header_nonbin_value_is_legal_type grpc_header_nonbin_value_is_legal_import;
+#define grpc_header_nonbin_value_is_legal grpc_header_nonbin_value_is_legal_import
+typedef int(*grpc_is_binary_header_type)(const char *key, size_t length);
+extern grpc_is_binary_header_type grpc_is_binary_header_import;
+#define grpc_is_binary_header grpc_is_binary_header_import
+typedef const grpc_auth_property *(*grpc_auth_property_iterator_next_type)(grpc_auth_property_iterator *it);
+extern grpc_auth_property_iterator_next_type grpc_auth_property_iterator_next_import;
+#define grpc_auth_property_iterator_next grpc_auth_property_iterator_next_import
+typedef grpc_auth_property_iterator(*grpc_auth_context_property_iterator_type)(const grpc_auth_context *ctx);
+extern grpc_auth_context_property_iterator_type grpc_auth_context_property_iterator_import;
+#define grpc_auth_context_property_iterator grpc_auth_context_property_iterator_import
+typedef grpc_auth_property_iterator(*grpc_auth_context_peer_identity_type)(const grpc_auth_context *ctx);
+extern grpc_auth_context_peer_identity_type grpc_auth_context_peer_identity_import;
+#define grpc_auth_context_peer_identity grpc_auth_context_peer_identity_import
+typedef grpc_auth_property_iterator(*grpc_auth_context_find_properties_by_name_type)(const grpc_auth_context *ctx, const char *name);
+extern grpc_auth_context_find_properties_by_name_type grpc_auth_context_find_properties_by_name_import;
+#define grpc_auth_context_find_properties_by_name grpc_auth_context_find_properties_by_name_import
+typedef const char *(*grpc_auth_context_peer_identity_property_name_type)(const grpc_auth_context *ctx);
+extern grpc_auth_context_peer_identity_property_name_type grpc_auth_context_peer_identity_property_name_import;
+#define grpc_auth_context_peer_identity_property_name grpc_auth_context_peer_identity_property_name_import
+typedef int(*grpc_auth_context_peer_is_authenticated_type)(const grpc_auth_context *ctx);
+extern grpc_auth_context_peer_is_authenticated_type grpc_auth_context_peer_is_authenticated_import;
+#define grpc_auth_context_peer_is_authenticated grpc_auth_context_peer_is_authenticated_import
+typedef grpc_auth_context *(*grpc_call_auth_context_type)(grpc_call *call);
+extern grpc_call_auth_context_type grpc_call_auth_context_import;
+#define grpc_call_auth_context grpc_call_auth_context_import
+typedef void(*grpc_auth_context_release_type)(grpc_auth_context *context);
+extern grpc_auth_context_release_type grpc_auth_context_release_import;
+#define grpc_auth_context_release grpc_auth_context_release_import
+typedef void(*grpc_auth_context_add_property_type)(grpc_auth_context *ctx, const char *name, const char *value, size_t value_length);
+extern grpc_auth_context_add_property_type grpc_auth_context_add_property_import;
+#define grpc_auth_context_add_property grpc_auth_context_add_property_import
+typedef void(*grpc_auth_context_add_cstring_property_type)(grpc_auth_context *ctx, const char *name, const char *value);
+extern grpc_auth_context_add_cstring_property_type grpc_auth_context_add_cstring_property_import;
+#define grpc_auth_context_add_cstring_property grpc_auth_context_add_cstring_property_import
+typedef int(*grpc_auth_context_set_peer_identity_property_name_type)(grpc_auth_context *ctx, const char *name);
+extern grpc_auth_context_set_peer_identity_property_name_type grpc_auth_context_set_peer_identity_property_name_import;
+#define grpc_auth_context_set_peer_identity_property_name grpc_auth_context_set_peer_identity_property_name_import
+typedef void(*grpc_channel_credentials_release_type)(grpc_channel_credentials *creds);
+extern grpc_channel_credentials_release_type grpc_channel_credentials_release_import;
+#define grpc_channel_credentials_release grpc_channel_credentials_release_import
+typedef grpc_channel_credentials *(*grpc_google_default_credentials_create_type)(void);
+extern grpc_google_default_credentials_create_type grpc_google_default_credentials_create_import;
+#define grpc_google_default_credentials_create grpc_google_default_credentials_create_import
+typedef grpc_channel_credentials *(*grpc_ssl_credentials_create_type)(const char *pem_root_certs, grpc_ssl_pem_key_cert_pair *pem_key_cert_pair, void *reserved);
+extern grpc_ssl_credentials_create_type grpc_ssl_credentials_create_import;
+#define grpc_ssl_credentials_create grpc_ssl_credentials_create_import
+typedef void(*grpc_call_credentials_release_type)(grpc_call_credentials *creds);
+extern grpc_call_credentials_release_type grpc_call_credentials_release_import;
+#define grpc_call_credentials_release grpc_call_credentials_release_import
+typedef grpc_channel_credentials *(*grpc_composite_channel_credentials_create_type)(grpc_channel_credentials *channel_creds, grpc_call_credentials *call_creds, void *reserved);
+extern grpc_composite_channel_credentials_create_type grpc_composite_channel_credentials_create_import;
+#define grpc_composite_channel_credentials_create grpc_composite_channel_credentials_create_import
+typedef grpc_call_credentials *(*grpc_composite_call_credentials_create_type)(grpc_call_credentials *creds1, grpc_call_credentials *creds2, void *reserved);
+extern grpc_composite_call_credentials_create_type grpc_composite_call_credentials_create_import;
+#define grpc_composite_call_credentials_create grpc_composite_call_credentials_create_import
+typedef grpc_call_credentials *(*grpc_google_compute_engine_credentials_create_type)(void *reserved);
+extern grpc_google_compute_engine_credentials_create_type grpc_google_compute_engine_credentials_create_import;
+#define grpc_google_compute_engine_credentials_create grpc_google_compute_engine_credentials_create_import
+typedef gpr_timespec(*grpc_max_auth_token_lifetime_type)();
+extern grpc_max_auth_token_lifetime_type grpc_max_auth_token_lifetime_import;
+#define grpc_max_auth_token_lifetime grpc_max_auth_token_lifetime_import
+typedef grpc_call_credentials *(*grpc_service_account_jwt_access_credentials_create_type)(const char *json_key, gpr_timespec token_lifetime, void *reserved);
+extern grpc_service_account_jwt_access_credentials_create_type grpc_service_account_jwt_access_credentials_create_import;
+#define grpc_service_account_jwt_access_credentials_create grpc_service_account_jwt_access_credentials_create_import
+typedef grpc_call_credentials *(*grpc_google_refresh_token_credentials_create_type)(const char *json_refresh_token, void *reserved);
+extern grpc_google_refresh_token_credentials_create_type grpc_google_refresh_token_credentials_create_import;
+#define grpc_google_refresh_token_credentials_create grpc_google_refresh_token_credentials_create_import
+typedef grpc_call_credentials *(*grpc_access_token_credentials_create_type)(const char *access_token, void *reserved);
+extern grpc_access_token_credentials_create_type grpc_access_token_credentials_create_import;
+#define grpc_access_token_credentials_create grpc_access_token_credentials_create_import
+typedef grpc_call_credentials *(*grpc_google_iam_credentials_create_type)(const char *authorization_token, const char *authority_selector, void *reserved);
+extern grpc_google_iam_credentials_create_type grpc_google_iam_credentials_create_import;
+#define grpc_google_iam_credentials_create grpc_google_iam_credentials_create_import
+typedef grpc_call_credentials *(*grpc_metadata_credentials_create_from_plugin_type)(grpc_metadata_credentials_plugin plugin, void *reserved);
+extern grpc_metadata_credentials_create_from_plugin_type grpc_metadata_credentials_create_from_plugin_import;
+#define grpc_metadata_credentials_create_from_plugin grpc_metadata_credentials_create_from_plugin_import
+typedef grpc_channel *(*grpc_secure_channel_create_type)(grpc_channel_credentials *creds, const char *target, const grpc_channel_args *args, void *reserved);
+extern grpc_secure_channel_create_type grpc_secure_channel_create_import;
+#define grpc_secure_channel_create grpc_secure_channel_create_import
+typedef void(*grpc_server_credentials_release_type)(grpc_server_credentials *creds);
+extern grpc_server_credentials_release_type grpc_server_credentials_release_import;
+#define grpc_server_credentials_release grpc_server_credentials_release_import
+typedef grpc_server_credentials *(*grpc_ssl_server_credentials_create_type)(const char *pem_root_certs, grpc_ssl_pem_key_cert_pair *pem_key_cert_pairs, size_t num_key_cert_pairs, int force_client_auth, void *reserved);
+extern grpc_ssl_server_credentials_create_type grpc_ssl_server_credentials_create_import;
+#define grpc_ssl_server_credentials_create grpc_ssl_server_credentials_create_import
+typedef int(*grpc_server_add_secure_http2_port_type)(grpc_server *server, const char *addr, grpc_server_credentials *creds);
+extern grpc_server_add_secure_http2_port_type grpc_server_add_secure_http2_port_import;
+#define grpc_server_add_secure_http2_port grpc_server_add_secure_http2_port_import
+typedef grpc_call_error(*grpc_call_set_credentials_type)(grpc_call *call, grpc_call_credentials *creds);
+extern grpc_call_set_credentials_type grpc_call_set_credentials_import;
+#define grpc_call_set_credentials grpc_call_set_credentials_import
+typedef void(*grpc_server_credentials_set_auth_metadata_processor_type)(grpc_server_credentials *creds, grpc_auth_metadata_processor processor);
+extern grpc_server_credentials_set_auth_metadata_processor_type grpc_server_credentials_set_auth_metadata_processor_import;
+#define grpc_server_credentials_set_auth_metadata_processor grpc_server_credentials_set_auth_metadata_processor_import
+typedef void *(*gpr_malloc_type)(size_t size);
+extern gpr_malloc_type gpr_malloc_import;
+#define gpr_malloc gpr_malloc_import
+typedef void(*gpr_free_type)(void *ptr);
+extern gpr_free_type gpr_free_import;
+#define gpr_free gpr_free_import
+typedef void *(*gpr_realloc_type)(void *p, size_t size);
+extern gpr_realloc_type gpr_realloc_import;
+#define gpr_realloc gpr_realloc_import
+typedef void *(*gpr_malloc_aligned_type)(size_t size, size_t alignment_log);
+extern gpr_malloc_aligned_type gpr_malloc_aligned_import;
+#define gpr_malloc_aligned gpr_malloc_aligned_import
+typedef void(*gpr_free_aligned_type)(void *ptr);
+extern gpr_free_aligned_type gpr_free_aligned_import;
+#define gpr_free_aligned gpr_free_aligned_import
+typedef void(*gpr_set_allocation_functions_type)(gpr_allocation_functions functions);
+extern gpr_set_allocation_functions_type gpr_set_allocation_functions_import;
+#define gpr_set_allocation_functions gpr_set_allocation_functions_import
+typedef gpr_allocation_functions(*gpr_get_allocation_functions_type)();
+extern gpr_get_allocation_functions_type gpr_get_allocation_functions_import;
+#define gpr_get_allocation_functions gpr_get_allocation_functions_import
+typedef grpc_byte_buffer *(*grpc_raw_byte_buffer_create_type)(gpr_slice *slices, size_t nslices);
+extern grpc_raw_byte_buffer_create_type grpc_raw_byte_buffer_create_import;
+#define grpc_raw_byte_buffer_create grpc_raw_byte_buffer_create_import
+typedef grpc_byte_buffer *(*grpc_raw_compressed_byte_buffer_create_type)(gpr_slice *slices, size_t nslices, grpc_compression_algorithm compression);
+extern grpc_raw_compressed_byte_buffer_create_type grpc_raw_compressed_byte_buffer_create_import;
+#define grpc_raw_compressed_byte_buffer_create grpc_raw_compressed_byte_buffer_create_import
+typedef grpc_byte_buffer *(*grpc_byte_buffer_copy_type)(grpc_byte_buffer *bb);
+extern grpc_byte_buffer_copy_type grpc_byte_buffer_copy_import;
+#define grpc_byte_buffer_copy grpc_byte_buffer_copy_import
+typedef size_t(*grpc_byte_buffer_length_type)(grpc_byte_buffer *bb);
+extern grpc_byte_buffer_length_type grpc_byte_buffer_length_import;
+#define grpc_byte_buffer_length grpc_byte_buffer_length_import
+typedef void(*grpc_byte_buffer_destroy_type)(grpc_byte_buffer *byte_buffer);
+extern grpc_byte_buffer_destroy_type grpc_byte_buffer_destroy_import;
+#define grpc_byte_buffer_destroy grpc_byte_buffer_destroy_import
+typedef void(*grpc_byte_buffer_reader_init_type)(grpc_byte_buffer_reader *reader, grpc_byte_buffer *buffer);
+extern grpc_byte_buffer_reader_init_type grpc_byte_buffer_reader_init_import;
+#define grpc_byte_buffer_reader_init grpc_byte_buffer_reader_init_import
+typedef void(*grpc_byte_buffer_reader_destroy_type)(grpc_byte_buffer_reader *reader);
+extern grpc_byte_buffer_reader_destroy_type grpc_byte_buffer_reader_destroy_import;
+#define grpc_byte_buffer_reader_destroy grpc_byte_buffer_reader_destroy_import
+typedef int(*grpc_byte_buffer_reader_next_type)(grpc_byte_buffer_reader *reader, gpr_slice *slice);
+extern grpc_byte_buffer_reader_next_type grpc_byte_buffer_reader_next_import;
+#define grpc_byte_buffer_reader_next grpc_byte_buffer_reader_next_import
+typedef gpr_slice(*grpc_byte_buffer_reader_readall_type)(grpc_byte_buffer_reader *reader);
+extern grpc_byte_buffer_reader_readall_type grpc_byte_buffer_reader_readall_import;
+#define grpc_byte_buffer_reader_readall grpc_byte_buffer_reader_readall_import
+typedef grpc_byte_buffer *(*grpc_raw_byte_buffer_from_reader_type)(grpc_byte_buffer_reader *reader);
+extern grpc_raw_byte_buffer_from_reader_type grpc_raw_byte_buffer_from_reader_import;
+#define grpc_raw_byte_buffer_from_reader grpc_raw_byte_buffer_from_reader_import
+typedef void(*gpr_log_type)(const char *file, int line, gpr_log_severity severity, const char *format, ...);
+extern gpr_log_type gpr_log_import;
+#define gpr_log gpr_log_import
+typedef void(*gpr_log_message_type)(const char *file, int line, gpr_log_severity severity, const char *message);
+extern gpr_log_message_type gpr_log_message_import;
+#define gpr_log_message gpr_log_message_import
+typedef void(*gpr_set_log_function_type)(gpr_log_func func);
+extern gpr_set_log_function_type gpr_set_log_function_import;
+#define gpr_set_log_function gpr_set_log_function_import
+typedef gpr_slice(*gpr_slice_ref_type)(gpr_slice s);
+extern gpr_slice_ref_type gpr_slice_ref_import;
+#define gpr_slice_ref gpr_slice_ref_import
+typedef void(*gpr_slice_unref_type)(gpr_slice s);
+extern gpr_slice_unref_type gpr_slice_unref_import;
+#define gpr_slice_unref gpr_slice_unref_import
+typedef gpr_slice(*gpr_slice_new_type)(void *p, size_t len, void (*destroy)(void *));
+extern gpr_slice_new_type gpr_slice_new_import;
+#define gpr_slice_new gpr_slice_new_import
+typedef gpr_slice(*gpr_slice_new_with_len_type)(void *p, size_t len, void (*destroy)(void *, size_t));
+extern gpr_slice_new_with_len_type gpr_slice_new_with_len_import;
+#define gpr_slice_new_with_len gpr_slice_new_with_len_import
+typedef gpr_slice(*gpr_slice_malloc_type)(size_t length);
+extern gpr_slice_malloc_type gpr_slice_malloc_import;
+#define gpr_slice_malloc gpr_slice_malloc_import
+typedef gpr_slice(*gpr_slice_from_copied_string_type)(const char *source);
+extern gpr_slice_from_copied_string_type gpr_slice_from_copied_string_import;
+#define gpr_slice_from_copied_string gpr_slice_from_copied_string_import
+typedef gpr_slice(*gpr_slice_from_copied_buffer_type)(const char *source, size_t len);
+extern gpr_slice_from_copied_buffer_type gpr_slice_from_copied_buffer_import;
+#define gpr_slice_from_copied_buffer gpr_slice_from_copied_buffer_import
+typedef gpr_slice(*gpr_slice_from_static_string_type)(const char *source);
+extern gpr_slice_from_static_string_type gpr_slice_from_static_string_import;
+#define gpr_slice_from_static_string gpr_slice_from_static_string_import
+typedef gpr_slice(*gpr_slice_sub_type)(gpr_slice s, size_t begin, size_t end);
+extern gpr_slice_sub_type gpr_slice_sub_import;
+#define gpr_slice_sub gpr_slice_sub_import
+typedef gpr_slice(*gpr_slice_sub_no_ref_type)(gpr_slice s, size_t begin, size_t end);
+extern gpr_slice_sub_no_ref_type gpr_slice_sub_no_ref_import;
+#define gpr_slice_sub_no_ref gpr_slice_sub_no_ref_import
+typedef gpr_slice(*gpr_slice_split_tail_type)(gpr_slice *s, size_t split);
+extern gpr_slice_split_tail_type gpr_slice_split_tail_import;
+#define gpr_slice_split_tail gpr_slice_split_tail_import
+typedef gpr_slice(*gpr_slice_split_head_type)(gpr_slice *s, size_t split);
+extern gpr_slice_split_head_type gpr_slice_split_head_import;
+#define gpr_slice_split_head gpr_slice_split_head_import
+typedef gpr_slice(*gpr_empty_slice_type)(void);
+extern gpr_empty_slice_type gpr_empty_slice_import;
+#define gpr_empty_slice gpr_empty_slice_import
+typedef int(*gpr_slice_cmp_type)(gpr_slice a, gpr_slice b);
+extern gpr_slice_cmp_type gpr_slice_cmp_import;
+#define gpr_slice_cmp gpr_slice_cmp_import
+typedef int(*gpr_slice_str_cmp_type)(gpr_slice a, const char *b);
+extern gpr_slice_str_cmp_type gpr_slice_str_cmp_import;
+#define gpr_slice_str_cmp gpr_slice_str_cmp_import
+typedef void(*gpr_slice_buffer_init_type)(gpr_slice_buffer *sb);
+extern gpr_slice_buffer_init_type gpr_slice_buffer_init_import;
+#define gpr_slice_buffer_init gpr_slice_buffer_init_import
+typedef void(*gpr_slice_buffer_destroy_type)(gpr_slice_buffer *sb);
+extern gpr_slice_buffer_destroy_type gpr_slice_buffer_destroy_import;
+#define gpr_slice_buffer_destroy gpr_slice_buffer_destroy_import
+typedef void(*gpr_slice_buffer_add_type)(gpr_slice_buffer *sb, gpr_slice slice);
+extern gpr_slice_buffer_add_type gpr_slice_buffer_add_import;
+#define gpr_slice_buffer_add gpr_slice_buffer_add_import
+typedef size_t(*gpr_slice_buffer_add_indexed_type)(gpr_slice_buffer *sb, gpr_slice slice);
+extern gpr_slice_buffer_add_indexed_type gpr_slice_buffer_add_indexed_import;
+#define gpr_slice_buffer_add_indexed gpr_slice_buffer_add_indexed_import
+typedef void(*gpr_slice_buffer_addn_type)(gpr_slice_buffer *sb, gpr_slice *slices, size_t n);
+extern gpr_slice_buffer_addn_type gpr_slice_buffer_addn_import;
+#define gpr_slice_buffer_addn gpr_slice_buffer_addn_import
+typedef uint8_t *(*gpr_slice_buffer_tiny_add_type)(gpr_slice_buffer *sb, size_t len);
+extern gpr_slice_buffer_tiny_add_type gpr_slice_buffer_tiny_add_import;
+#define gpr_slice_buffer_tiny_add gpr_slice_buffer_tiny_add_import
+typedef void(*gpr_slice_buffer_pop_type)(gpr_slice_buffer *sb);
+extern gpr_slice_buffer_pop_type gpr_slice_buffer_pop_import;
+#define gpr_slice_buffer_pop gpr_slice_buffer_pop_import
+typedef void(*gpr_slice_buffer_reset_and_unref_type)(gpr_slice_buffer *sb);
+extern gpr_slice_buffer_reset_and_unref_type gpr_slice_buffer_reset_and_unref_import;
+#define gpr_slice_buffer_reset_and_unref gpr_slice_buffer_reset_and_unref_import
+typedef void(*gpr_slice_buffer_swap_type)(gpr_slice_buffer *a, gpr_slice_buffer *b);
+extern gpr_slice_buffer_swap_type gpr_slice_buffer_swap_import;
+#define gpr_slice_buffer_swap gpr_slice_buffer_swap_import
+typedef void(*gpr_slice_buffer_move_into_type)(gpr_slice_buffer *src, gpr_slice_buffer *dst);
+extern gpr_slice_buffer_move_into_type gpr_slice_buffer_move_into_import;
+#define gpr_slice_buffer_move_into gpr_slice_buffer_move_into_import
+typedef void(*gpr_slice_buffer_trim_end_type)(gpr_slice_buffer *src, size_t n, gpr_slice_buffer *garbage);
+extern gpr_slice_buffer_trim_end_type gpr_slice_buffer_trim_end_import;
+#define gpr_slice_buffer_trim_end gpr_slice_buffer_trim_end_import
+typedef void(*gpr_slice_buffer_move_first_type)(gpr_slice_buffer *src, size_t n, gpr_slice_buffer *dst);
+extern gpr_slice_buffer_move_first_type gpr_slice_buffer_move_first_import;
+#define gpr_slice_buffer_move_first gpr_slice_buffer_move_first_import
+typedef gpr_slice(*gpr_slice_buffer_take_first_type)(gpr_slice_buffer *src);
+extern gpr_slice_buffer_take_first_type gpr_slice_buffer_take_first_import;
+#define gpr_slice_buffer_take_first gpr_slice_buffer_take_first_import
+typedef void(*gpr_mu_init_type)(gpr_mu *mu);
+extern gpr_mu_init_type gpr_mu_init_import;
+#define gpr_mu_init gpr_mu_init_import
+typedef void(*gpr_mu_destroy_type)(gpr_mu *mu);
+extern gpr_mu_destroy_type gpr_mu_destroy_import;
+#define gpr_mu_destroy gpr_mu_destroy_import
+typedef void(*gpr_mu_lock_type)(gpr_mu *mu);
+extern gpr_mu_lock_type gpr_mu_lock_import;
+#define gpr_mu_lock gpr_mu_lock_import
+typedef void(*gpr_mu_unlock_type)(gpr_mu *mu);
+extern gpr_mu_unlock_type gpr_mu_unlock_import;
+#define gpr_mu_unlock gpr_mu_unlock_import
+typedef int(*gpr_mu_trylock_type)(gpr_mu *mu);
+extern gpr_mu_trylock_type gpr_mu_trylock_import;
+#define gpr_mu_trylock gpr_mu_trylock_import
+typedef void(*gpr_cv_init_type)(gpr_cv *cv);
+extern gpr_cv_init_type gpr_cv_init_import;
+#define gpr_cv_init gpr_cv_init_import
+typedef void(*gpr_cv_destroy_type)(gpr_cv *cv);
+extern gpr_cv_destroy_type gpr_cv_destroy_import;
+#define gpr_cv_destroy gpr_cv_destroy_import
+typedef int(*gpr_cv_wait_type)(gpr_cv *cv, gpr_mu *mu, gpr_timespec abs_deadline);
+extern gpr_cv_wait_type gpr_cv_wait_import;
+#define gpr_cv_wait gpr_cv_wait_import
+typedef void(*gpr_cv_signal_type)(gpr_cv *cv);
+extern gpr_cv_signal_type gpr_cv_signal_import;
+#define gpr_cv_signal gpr_cv_signal_import
+typedef void(*gpr_cv_broadcast_type)(gpr_cv *cv);
+extern gpr_cv_broadcast_type gpr_cv_broadcast_import;
+#define gpr_cv_broadcast gpr_cv_broadcast_import
+typedef void(*gpr_once_init_type)(gpr_once *once, void (*init_routine)(void));
+extern gpr_once_init_type gpr_once_init_import;
+#define gpr_once_init gpr_once_init_import
+typedef void(*gpr_event_init_type)(gpr_event *ev);
+extern gpr_event_init_type gpr_event_init_import;
+#define gpr_event_init gpr_event_init_import
+typedef void(*gpr_event_set_type)(gpr_event *ev, void *value);
+extern gpr_event_set_type gpr_event_set_import;
+#define gpr_event_set gpr_event_set_import
+typedef void *(*gpr_event_get_type)(gpr_event *ev);
+extern gpr_event_get_type gpr_event_get_import;
+#define gpr_event_get gpr_event_get_import
+typedef void *(*gpr_event_wait_type)(gpr_event *ev, gpr_timespec abs_deadline);
+extern gpr_event_wait_type gpr_event_wait_import;
+#define gpr_event_wait gpr_event_wait_import
+typedef void(*gpr_ref_init_type)(gpr_refcount *r, int n);
+extern gpr_ref_init_type gpr_ref_init_import;
+#define gpr_ref_init gpr_ref_init_import
+typedef void(*gpr_ref_type)(gpr_refcount *r);
+extern gpr_ref_type gpr_ref_import;
+#define gpr_ref gpr_ref_import
+typedef void(*gpr_refn_type)(gpr_refcount *r, int n);
+extern gpr_refn_type gpr_refn_import;
+#define gpr_refn gpr_refn_import
+typedef int(*gpr_unref_type)(gpr_refcount *r);
+extern gpr_unref_type gpr_unref_import;
+#define gpr_unref gpr_unref_import
+typedef void(*gpr_stats_init_type)(gpr_stats_counter *c, intptr_t n);
+extern gpr_stats_init_type gpr_stats_init_import;
+#define gpr_stats_init gpr_stats_init_import
+typedef void(*gpr_stats_inc_type)(gpr_stats_counter *c, intptr_t inc);
+extern gpr_stats_inc_type gpr_stats_inc_import;
+#define gpr_stats_inc gpr_stats_inc_import
+typedef intptr_t(*gpr_stats_read_type)(const gpr_stats_counter *c);
+extern gpr_stats_read_type gpr_stats_read_import;
+#define gpr_stats_read gpr_stats_read_import
+typedef gpr_timespec(*gpr_time_0_type)(gpr_clock_type type);
+extern gpr_time_0_type gpr_time_0_import;
+#define gpr_time_0 gpr_time_0_import
+typedef gpr_timespec(*gpr_inf_future_type)(gpr_clock_type type);
+extern gpr_inf_future_type gpr_inf_future_import;
+#define gpr_inf_future gpr_inf_future_import
+typedef gpr_timespec(*gpr_inf_past_type)(gpr_clock_type type);
+extern gpr_inf_past_type gpr_inf_past_import;
+#define gpr_inf_past gpr_inf_past_import
+typedef void(*gpr_time_init_type)(void);
+extern gpr_time_init_type gpr_time_init_import;
+#define gpr_time_init gpr_time_init_import
+typedef gpr_timespec(*gpr_now_type)(gpr_clock_type clock);
+extern gpr_now_type gpr_now_import;
+#define gpr_now gpr_now_import
+typedef gpr_timespec(*gpr_convert_clock_type_type)(gpr_timespec t, gpr_clock_type target_clock);
+extern gpr_convert_clock_type_type gpr_convert_clock_type_import;
+#define gpr_convert_clock_type gpr_convert_clock_type_import
+typedef int(*gpr_time_cmp_type)(gpr_timespec a, gpr_timespec b);
+extern gpr_time_cmp_type gpr_time_cmp_import;
+#define gpr_time_cmp gpr_time_cmp_import
+typedef gpr_timespec(*gpr_time_max_type)(gpr_timespec a, gpr_timespec b);
+extern gpr_time_max_type gpr_time_max_import;
+#define gpr_time_max gpr_time_max_import
+typedef gpr_timespec(*gpr_time_min_type)(gpr_timespec a, gpr_timespec b);
+extern gpr_time_min_type gpr_time_min_import;
+#define gpr_time_min gpr_time_min_import
+typedef gpr_timespec(*gpr_time_add_type)(gpr_timespec a, gpr_timespec b);
+extern gpr_time_add_type gpr_time_add_import;
+#define gpr_time_add gpr_time_add_import
+typedef gpr_timespec(*gpr_time_sub_type)(gpr_timespec a, gpr_timespec b);
+extern gpr_time_sub_type gpr_time_sub_import;
+#define gpr_time_sub gpr_time_sub_import
+typedef gpr_timespec(*gpr_time_from_micros_type)(long x, gpr_clock_type clock_type);
+extern gpr_time_from_micros_type gpr_time_from_micros_import;
+#define gpr_time_from_micros gpr_time_from_micros_import
+typedef gpr_timespec(*gpr_time_from_nanos_type)(long x, gpr_clock_type clock_type);
+extern gpr_time_from_nanos_type gpr_time_from_nanos_import;
+#define gpr_time_from_nanos gpr_time_from_nanos_import
+typedef gpr_timespec(*gpr_time_from_millis_type)(long x, gpr_clock_type clock_type);
+extern gpr_time_from_millis_type gpr_time_from_millis_import;
+#define gpr_time_from_millis gpr_time_from_millis_import
+typedef gpr_timespec(*gpr_time_from_seconds_type)(long x, gpr_clock_type clock_type);
+extern gpr_time_from_seconds_type gpr_time_from_seconds_import;
+#define gpr_time_from_seconds gpr_time_from_seconds_import
+typedef gpr_timespec(*gpr_time_from_minutes_type)(long x, gpr_clock_type clock_type);
+extern gpr_time_from_minutes_type gpr_time_from_minutes_import;
+#define gpr_time_from_minutes gpr_time_from_minutes_import
+typedef gpr_timespec(*gpr_time_from_hours_type)(long x, gpr_clock_type clock_type);
+extern gpr_time_from_hours_type gpr_time_from_hours_import;
+#define gpr_time_from_hours gpr_time_from_hours_import
+typedef int32_t(*gpr_time_to_millis_type)(gpr_timespec timespec);
+extern gpr_time_to_millis_type gpr_time_to_millis_import;
+#define gpr_time_to_millis gpr_time_to_millis_import
+typedef int(*gpr_time_similar_type)(gpr_timespec a, gpr_timespec b, gpr_timespec threshold);
+extern gpr_time_similar_type gpr_time_similar_import;
+#define gpr_time_similar gpr_time_similar_import
+typedef void(*gpr_sleep_until_type)(gpr_timespec until);
+extern gpr_sleep_until_type gpr_sleep_until_import;
+#define gpr_sleep_until gpr_sleep_until_import
+typedef double(*gpr_timespec_to_micros_type)(gpr_timespec t);
+extern gpr_timespec_to_micros_type gpr_timespec_to_micros_import;
+#define gpr_timespec_to_micros gpr_timespec_to_micros_import
+typedef gpr_avl(*gpr_avl_create_type)(const gpr_avl_vtable *vtable);
+extern gpr_avl_create_type gpr_avl_create_import;
+#define gpr_avl_create gpr_avl_create_import
+typedef gpr_avl(*gpr_avl_ref_type)(gpr_avl avl);
+extern gpr_avl_ref_type gpr_avl_ref_import;
+#define gpr_avl_ref gpr_avl_ref_import
+typedef void(*gpr_avl_unref_type)(gpr_avl avl);
+extern gpr_avl_unref_type gpr_avl_unref_import;
+#define gpr_avl_unref gpr_avl_unref_import
+typedef gpr_avl(*gpr_avl_add_type)(gpr_avl avl, void *key, void *value);
+extern gpr_avl_add_type gpr_avl_add_import;
+#define gpr_avl_add gpr_avl_add_import
+typedef gpr_avl(*gpr_avl_remove_type)(gpr_avl avl, void *key);
+extern gpr_avl_remove_type gpr_avl_remove_import;
+#define gpr_avl_remove gpr_avl_remove_import
+typedef void *(*gpr_avl_get_type)(gpr_avl avl, void *key);
+extern gpr_avl_get_type gpr_avl_get_import;
+#define gpr_avl_get gpr_avl_get_import
+typedef gpr_cmdline *(*gpr_cmdline_create_type)(const char *description);
+extern gpr_cmdline_create_type gpr_cmdline_create_import;
+#define gpr_cmdline_create gpr_cmdline_create_import
+typedef void(*gpr_cmdline_add_int_type)(gpr_cmdline *cl, const char *name, const char *help, int *value);
+extern gpr_cmdline_add_int_type gpr_cmdline_add_int_import;
+#define gpr_cmdline_add_int gpr_cmdline_add_int_import
+typedef void(*gpr_cmdline_add_flag_type)(gpr_cmdline *cl, const char *name, const char *help, int *value);
+extern gpr_cmdline_add_flag_type gpr_cmdline_add_flag_import;
+#define gpr_cmdline_add_flag gpr_cmdline_add_flag_import
+typedef void(*gpr_cmdline_add_string_type)(gpr_cmdline *cl, const char *name, const char *help, char **value);
+extern gpr_cmdline_add_string_type gpr_cmdline_add_string_import;
+#define gpr_cmdline_add_string gpr_cmdline_add_string_import
+typedef void(*gpr_cmdline_on_extra_arg_type)(gpr_cmdline *cl, const char *name, const char *help, void (*on_extra_arg)(void *user_data, const char *arg), void *user_data);
+extern gpr_cmdline_on_extra_arg_type gpr_cmdline_on_extra_arg_import;
+#define gpr_cmdline_on_extra_arg gpr_cmdline_on_extra_arg_import
+typedef void(*gpr_cmdline_set_survive_failure_type)(gpr_cmdline *cl);
+extern gpr_cmdline_set_survive_failure_type gpr_cmdline_set_survive_failure_import;
+#define gpr_cmdline_set_survive_failure gpr_cmdline_set_survive_failure_import
+typedef int(*gpr_cmdline_parse_type)(gpr_cmdline *cl, int argc, char **argv);
+extern gpr_cmdline_parse_type gpr_cmdline_parse_import;
+#define gpr_cmdline_parse gpr_cmdline_parse_import
+typedef void(*gpr_cmdline_destroy_type)(gpr_cmdline *cl);
+extern gpr_cmdline_destroy_type gpr_cmdline_destroy_import;
+#define gpr_cmdline_destroy gpr_cmdline_destroy_import
+typedef char *(*gpr_cmdline_usage_string_type)(gpr_cmdline *cl, const char *argv0);
+extern gpr_cmdline_usage_string_type gpr_cmdline_usage_string_import;
+#define gpr_cmdline_usage_string gpr_cmdline_usage_string_import
+typedef unsigned(*gpr_cpu_num_cores_type)(void);
+extern gpr_cpu_num_cores_type gpr_cpu_num_cores_import;
+#define gpr_cpu_num_cores gpr_cpu_num_cores_import
+typedef unsigned(*gpr_cpu_current_cpu_type)(void);
+extern gpr_cpu_current_cpu_type gpr_cpu_current_cpu_import;
+#define gpr_cpu_current_cpu gpr_cpu_current_cpu_import
+typedef gpr_histogram *(*gpr_histogram_create_type)(double resolution, double max_bucket_start);
+extern gpr_histogram_create_type gpr_histogram_create_import;
+#define gpr_histogram_create gpr_histogram_create_import
+typedef void(*gpr_histogram_destroy_type)(gpr_histogram *h);
+extern gpr_histogram_destroy_type gpr_histogram_destroy_import;
+#define gpr_histogram_destroy gpr_histogram_destroy_import
+typedef void(*gpr_histogram_add_type)(gpr_histogram *h, double x);
+extern gpr_histogram_add_type gpr_histogram_add_import;
+#define gpr_histogram_add gpr_histogram_add_import
+typedef int(*gpr_histogram_merge_type)(gpr_histogram *dst, const gpr_histogram *src);
+extern gpr_histogram_merge_type gpr_histogram_merge_import;
+#define gpr_histogram_merge gpr_histogram_merge_import
+typedef double(*gpr_histogram_percentile_type)(gpr_histogram *histogram, double percentile);
+extern gpr_histogram_percentile_type gpr_histogram_percentile_import;
+#define gpr_histogram_percentile gpr_histogram_percentile_import
+typedef double(*gpr_histogram_mean_type)(gpr_histogram *histogram);
+extern gpr_histogram_mean_type gpr_histogram_mean_import;
+#define gpr_histogram_mean gpr_histogram_mean_import
+typedef double(*gpr_histogram_stddev_type)(gpr_histogram *histogram);
+extern gpr_histogram_stddev_type gpr_histogram_stddev_import;
+#define gpr_histogram_stddev gpr_histogram_stddev_import
+typedef double(*gpr_histogram_variance_type)(gpr_histogram *histogram);
+extern gpr_histogram_variance_type gpr_histogram_variance_import;
+#define gpr_histogram_variance gpr_histogram_variance_import
+typedef double(*gpr_histogram_maximum_type)(gpr_histogram *histogram);
+extern gpr_histogram_maximum_type gpr_histogram_maximum_import;
+#define gpr_histogram_maximum gpr_histogram_maximum_import
+typedef double(*gpr_histogram_minimum_type)(gpr_histogram *histogram);
+extern gpr_histogram_minimum_type gpr_histogram_minimum_import;
+#define gpr_histogram_minimum gpr_histogram_minimum_import
+typedef double(*gpr_histogram_count_type)(gpr_histogram *histogram);
+extern gpr_histogram_count_type gpr_histogram_count_import;
+#define gpr_histogram_count gpr_histogram_count_import
+typedef double(*gpr_histogram_sum_type)(gpr_histogram *histogram);
+extern gpr_histogram_sum_type gpr_histogram_sum_import;
+#define gpr_histogram_sum gpr_histogram_sum_import
+typedef double(*gpr_histogram_sum_of_squares_type)(gpr_histogram *histogram);
+extern gpr_histogram_sum_of_squares_type gpr_histogram_sum_of_squares_import;
+#define gpr_histogram_sum_of_squares gpr_histogram_sum_of_squares_import
+typedef const uint32_t *(*gpr_histogram_get_contents_type)(gpr_histogram *histogram, size_t *count);
+extern gpr_histogram_get_contents_type gpr_histogram_get_contents_import;
+#define gpr_histogram_get_contents gpr_histogram_get_contents_import
+typedef void(*gpr_histogram_merge_contents_type)(gpr_histogram *histogram, const uint32_t *data, size_t data_count, double min_seen, double max_seen, double sum, double sum_of_squares, double count);
+extern gpr_histogram_merge_contents_type gpr_histogram_merge_contents_import;
+#define gpr_histogram_merge_contents gpr_histogram_merge_contents_import
+typedef int(*gpr_join_host_port_type)(char **out, const char *host, int port);
+extern gpr_join_host_port_type gpr_join_host_port_import;
+#define gpr_join_host_port gpr_join_host_port_import
+typedef int(*gpr_split_host_port_type)(const char *name, char **host, char **port);
+extern gpr_split_host_port_type gpr_split_host_port_import;
+#define gpr_split_host_port gpr_split_host_port_import
+typedef char *(*gpr_format_message_type)(int messageid);
+extern gpr_format_message_type gpr_format_message_import;
+#define gpr_format_message gpr_format_message_import
+typedef char *(*gpr_strdup_type)(const char *src);
+extern gpr_strdup_type gpr_strdup_import;
+#define gpr_strdup gpr_strdup_import
+typedef int(*gpr_asprintf_type)(char **strp, const char *format, ...);
+extern gpr_asprintf_type gpr_asprintf_import;
+#define gpr_asprintf gpr_asprintf_import
+typedef const char *(*gpr_subprocess_binary_extension_type)();
+extern gpr_subprocess_binary_extension_type gpr_subprocess_binary_extension_import;
+#define gpr_subprocess_binary_extension gpr_subprocess_binary_extension_import
+typedef gpr_subprocess *(*gpr_subprocess_create_type)(int argc, const char **argv);
+extern gpr_subprocess_create_type gpr_subprocess_create_import;
+#define gpr_subprocess_create gpr_subprocess_create_import
+typedef void(*gpr_subprocess_destroy_type)(gpr_subprocess *p);
+extern gpr_subprocess_destroy_type gpr_subprocess_destroy_import;
+#define gpr_subprocess_destroy gpr_subprocess_destroy_import
+typedef int(*gpr_subprocess_join_type)(gpr_subprocess *p);
+extern gpr_subprocess_join_type gpr_subprocess_join_import;
+#define gpr_subprocess_join gpr_subprocess_join_import
+typedef void(*gpr_subprocess_interrupt_type)(gpr_subprocess *p);
+extern gpr_subprocess_interrupt_type gpr_subprocess_interrupt_import;
+#define gpr_subprocess_interrupt gpr_subprocess_interrupt_import
+typedef int(*gpr_thd_new_type)(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg, const gpr_thd_options *options);
+extern gpr_thd_new_type gpr_thd_new_import;
+#define gpr_thd_new gpr_thd_new_import
+typedef gpr_thd_options(*gpr_thd_options_default_type)(void);
+extern gpr_thd_options_default_type gpr_thd_options_default_import;
+#define gpr_thd_options_default gpr_thd_options_default_import
+typedef void(*gpr_thd_options_set_detached_type)(gpr_thd_options *options);
+extern gpr_thd_options_set_detached_type gpr_thd_options_set_detached_import;
+#define gpr_thd_options_set_detached gpr_thd_options_set_detached_import
+typedef void(*gpr_thd_options_set_joinable_type)(gpr_thd_options *options);
+extern gpr_thd_options_set_joinable_type gpr_thd_options_set_joinable_import;
+#define gpr_thd_options_set_joinable gpr_thd_options_set_joinable_import
+typedef int(*gpr_thd_options_is_detached_type)(const gpr_thd_options *options);
+extern gpr_thd_options_is_detached_type gpr_thd_options_is_detached_import;
+#define gpr_thd_options_is_detached gpr_thd_options_is_detached_import
+typedef int(*gpr_thd_options_is_joinable_type)(const gpr_thd_options *options);
+extern gpr_thd_options_is_joinable_type gpr_thd_options_is_joinable_import;
+#define gpr_thd_options_is_joinable gpr_thd_options_is_joinable_import
+typedef gpr_thd_id(*gpr_thd_currentid_type)(void);
+extern gpr_thd_currentid_type gpr_thd_currentid_import;
+#define gpr_thd_currentid gpr_thd_currentid_import
+typedef void(*gpr_thd_join_type)(gpr_thd_id t);
+extern gpr_thd_join_type gpr_thd_join_import;
+#define gpr_thd_join gpr_thd_join_import
+
+void pygrpc_load_imports(HMODULE library);
+
+#else /* !GPR_WIN32 */
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/slice.h>
+#include <grpc/support/time.h>
+#include <grpc/status.h>
+#include <grpc/byte_buffer.h>
+#include <grpc/byte_buffer_reader.h>
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
+
+#endif /* !GPR_WIN32 */
+
+#endif
diff --git a/src/core/census/context.h b/src/python/grpcio/grpc/_cython/loader.c
index 700bcf86cf..cdd47deed3 100644
--- a/src/core/census/context.h
+++ b/src/python/grpcio/grpc/_cython/loader.c
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015, Google Inc.
+ * Copyright 2016, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -31,17 +31,29 @@
  *
  */
 
-#ifndef GRPC_INTERNAL_CORE_CENSUS_CONTEXT_H
-#define GRPC_INTERNAL_CORE_CENSUS_CONTEXT_H
+#include "loader.h"
 
-#include <grpc/census.h>
+#if GPR_WIN32
 
-#define GRPC_CENSUS_MAX_ON_THE_WIRE_TAG_BYTES 2048
+int pygrpc_load_core(char *path) {
+  HMODULE grpc_c;
+#ifdef GPR_ARCH_32
+  /* Close your eyes for a moment, it'll all be over soon. */
+  char *six = strrchr(path, '6');
+  *six++ = '3';
+  *six = '2';
+#endif
+  grpc_c = LoadLibraryA(path);
+  if (grpc_c) {
+    pygrpc_load_imports(grpc_c);
+    return 1;
+  }
 
-/* census_context is the in-memory representation of information needed to
- * maintain tracing, RPC statistics and resource usage information. */
-struct census_context {
-  census_tag_set *tags; /* Opaque data structure for census tags. */
-};
+  return 0;
+}
 
-#endif /* GRPC_INTERNAL_CORE_CENSUS_CONTEXT_H */
+#else
+
+int pygrpc_load_core(char *path) { return 1; }
+
+#endif
diff --git a/src/python/grpcio/grpc/_cython/loader.h b/src/python/grpcio/grpc/_cython/loader.h
new file mode 100644
index 0000000000..dd31e1561b
--- /dev/null
+++ b/src/python/grpcio/grpc/_cython/loader.h
@@ -0,0 +1,45 @@
+/*
+ *
+ * Copyright 2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef PYGRPC_LOADER_H_
+#define PYGRPC_LOADER_H_
+
+#include "imports.generated.h"
+
+/* Additional inclusions not covered by "imports.generated.h" */
+#include <grpc/byte_buffer_reader.h>
+
+/* Attempts to load the core if necessary, and return non-zero upon succes. */
+int pygrpc_load_core(char *path);
+
+#endif /* GRPC_RB_BYTE_BUFFER_H_ */
diff --git a/src/python/grpcio/grpc_core_dependencies.py b/src/python/grpcio/grpc_core_dependencies.py
index 1b2490e9ff..6e89c87436 100644
--- a/src/python/grpcio/grpc_core_dependencies.py
+++ b/src/python/grpcio/grpc_core_dependencies.py
@@ -225,7 +225,6 @@ CORE_SOURCE_FILES = [
   'src/core/census/initialize.c',
   'src/core/census/operation.c',
   'src/core/census/placeholders.c',
-  'src/core/census/tag_set.c',
   'src/core/census/tracing.c',
   'src/boringssl/err_data.c',
   'third_party/boringssl/crypto/aes/aes.c',
diff --git a/src/ruby/ext/grpc/extconf.rb b/src/ruby/ext/grpc/extconf.rb
index f6f78f7810..426a6e67a0 100644
--- a/src/ruby/ext/grpc/extconf.rb
+++ b/src/ruby/ext/grpc/extconf.rb
@@ -67,14 +67,15 @@ else
 end
 
 unless File.exist?(File.join(grpc_lib_dir, 'libgrpc.a')) or windows
-  for var in %w( CC AR ) do
-    ENV[var] = RbConfig::CONFIG[var]
-  end
-
+  ENV['AR'] = RbConfig::CONFIG['AR'] + ' rcs'
+  ENV['CC'] = RbConfig::CONFIG['CC']
   ENV['LD'] = ENV['CC']
 
+  ENV['AR'] = 'libtool -o' if RUBY_PLATFORM =~ /darwin/
+
   ENV['EMBED_OPENSSL'] = 'true'
   ENV['EMBED_ZLIB'] = 'true'
+  ENV['ARCH_FLAGS'] = '-arch i386 -arch x86_64' if RUBY_PLATFORM =~ /darwin/
 
   output_dir = File.expand_path(RbConfig::CONFIG['topdir'])
   grpc_lib_dir = File.join(output_dir, 'libs', grpc_config)
@@ -107,6 +108,7 @@ puts 'Generating Makefile for ' + output
 create_makefile(output)
 
 strip_tool = RbConfig::CONFIG['STRIP']
+strip_tool = 'strip -x' if RUBY_PLATFORM =~ /darwin/
 
 if grpc_config == 'opt'
   File.open('Makefile.new', 'w') do |o|
diff --git a/src/ruby/ext/grpc/rb_grpc_imports.generated.c b/src/ruby/ext/grpc/rb_grpc_imports.generated.c
index a278b2ba99..d4ddb734c0 100644
--- a/src/ruby/ext/grpc/rb_grpc_imports.generated.c
+++ b/src/ruby/ext/grpc/rb_grpc_imports.generated.c
@@ -41,7 +41,14 @@ census_initialize_type census_initialize_import;
 census_shutdown_type census_shutdown_import;
 census_supported_type census_supported_import;
 census_enabled_type census_enabled_import;
-census_context_serialize_type census_context_serialize_import;
+census_context_create_type census_context_create_import;
+census_context_destroy_type census_context_destroy_import;
+census_context_get_status_type census_context_get_status_import;
+census_context_initialize_iterator_type census_context_initialize_iterator_import;
+census_context_next_tag_type census_context_next_tag_import;
+census_context_get_tag_type census_context_get_tag_import;
+census_context_encode_type census_context_encode_import;
+census_context_decode_type census_context_decode_import;
 census_trace_mask_type census_trace_mask_import;
 census_set_trace_mask_type census_set_trace_mask_import;
 census_start_rpc_op_timestamp_type census_start_rpc_op_timestamp_import;
@@ -54,15 +61,6 @@ census_trace_print_type census_trace_print_import;
 census_trace_scan_start_type census_trace_scan_start_import;
 census_get_trace_record_type census_get_trace_record_import;
 census_trace_scan_end_type census_trace_scan_end_import;
-census_tag_set_create_type census_tag_set_create_import;
-census_tag_set_destroy_type census_tag_set_destroy_import;
-census_tag_set_get_create_status_type census_tag_set_get_create_status_import;
-census_tag_set_initialize_iterator_type census_tag_set_initialize_iterator_import;
-census_tag_set_next_tag_type census_tag_set_next_tag_import;
-census_tag_set_get_tag_by_key_type census_tag_set_get_tag_by_key_import;
-census_tag_set_encode_type census_tag_set_encode_import;
-census_tag_set_decode_type census_tag_set_decode_import;
-census_context_tag_set_type census_context_tag_set_import;
 census_record_values_type census_record_values_import;
 census_view_create_type census_view_create_import;
 census_view_delete_type census_view_delete_import;
@@ -303,7 +301,14 @@ void grpc_rb_load_imports(HMODULE library) {
   census_shutdown_import = (census_shutdown_type) GetProcAddress(library, "census_shutdown");
   census_supported_import = (census_supported_type) GetProcAddress(library, "census_supported");
   census_enabled_import = (census_enabled_type) GetProcAddress(library, "census_enabled");
-  census_context_serialize_import = (census_context_serialize_type) GetProcAddress(library, "census_context_serialize");
+  census_context_create_import = (census_context_create_type) GetProcAddress(library, "census_context_create");
+  census_context_destroy_import = (census_context_destroy_type) GetProcAddress(library, "census_context_destroy");
+  census_context_get_status_import = (census_context_get_status_type) GetProcAddress(library, "census_context_get_status");
+  census_context_initialize_iterator_import = (census_context_initialize_iterator_type) GetProcAddress(library, "census_context_initialize_iterator");
+  census_context_next_tag_import = (census_context_next_tag_type) GetProcAddress(library, "census_context_next_tag");
+  census_context_get_tag_import = (census_context_get_tag_type) GetProcAddress(library, "census_context_get_tag");
+  census_context_encode_import = (census_context_encode_type) GetProcAddress(library, "census_context_encode");
+  census_context_decode_import = (census_context_decode_type) GetProcAddress(library, "census_context_decode");
   census_trace_mask_import = (census_trace_mask_type) GetProcAddress(library, "census_trace_mask");
   census_set_trace_mask_import = (census_set_trace_mask_type) GetProcAddress(library, "census_set_trace_mask");
   census_start_rpc_op_timestamp_import = (census_start_rpc_op_timestamp_type) GetProcAddress(library, "census_start_rpc_op_timestamp");
@@ -316,15 +321,6 @@ void grpc_rb_load_imports(HMODULE library) {
   census_trace_scan_start_import = (census_trace_scan_start_type) GetProcAddress(library, "census_trace_scan_start");
   census_get_trace_record_import = (census_get_trace_record_type) GetProcAddress(library, "census_get_trace_record");
   census_trace_scan_end_import = (census_trace_scan_end_type) GetProcAddress(library, "census_trace_scan_end");
-  census_tag_set_create_import = (census_tag_set_create_type) GetProcAddress(library, "census_tag_set_create");
-  census_tag_set_destroy_import = (census_tag_set_destroy_type) GetProcAddress(library, "census_tag_set_destroy");
-  census_tag_set_get_create_status_import = (census_tag_set_get_create_status_type) GetProcAddress(library, "census_tag_set_get_create_status");
-  census_tag_set_initialize_iterator_import = (census_tag_set_initialize_iterator_type) GetProcAddress(library, "census_tag_set_initialize_iterator");
-  census_tag_set_next_tag_import = (census_tag_set_next_tag_type) GetProcAddress(library, "census_tag_set_next_tag");
-  census_tag_set_get_tag_by_key_import = (census_tag_set_get_tag_by_key_type) GetProcAddress(library, "census_tag_set_get_tag_by_key");
-  census_tag_set_encode_import = (census_tag_set_encode_type) GetProcAddress(library, "census_tag_set_encode");
-  census_tag_set_decode_import = (census_tag_set_decode_type) GetProcAddress(library, "census_tag_set_decode");
-  census_context_tag_set_import = (census_context_tag_set_type) GetProcAddress(library, "census_context_tag_set");
   census_record_values_import = (census_record_values_type) GetProcAddress(library, "census_record_values");
   census_view_create_import = (census_view_create_type) GetProcAddress(library, "census_view_create");
   census_view_delete_import = (census_view_delete_type) GetProcAddress(library, "census_view_delete");
diff --git a/src/ruby/ext/grpc/rb_grpc_imports.generated.h b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
index 3e29496a43..45e9b47574 100644
--- a/src/ruby/ext/grpc/rb_grpc_imports.generated.h
+++ b/src/ruby/ext/grpc/rb_grpc_imports.generated.h
@@ -73,9 +73,30 @@ extern census_supported_type census_supported_import;
 typedef int(*census_enabled_type)(void);
 extern census_enabled_type census_enabled_import;
 #define census_enabled census_enabled_import
-typedef size_t(*census_context_serialize_type)(const census_context *context, char *buffer, size_t buf_size);
-extern census_context_serialize_type census_context_serialize_import;
-#define census_context_serialize census_context_serialize_import
+typedef census_context *(*census_context_create_type)(const census_context *base, const census_tag *tags, int ntags, census_context_status const **status);
+extern census_context_create_type census_context_create_import;
+#define census_context_create census_context_create_import
+typedef void(*census_context_destroy_type)(census_context *context);
+extern census_context_destroy_type census_context_destroy_import;
+#define census_context_destroy census_context_destroy_import
+typedef const census_context_status *(*census_context_get_status_type)(const census_context *context);
+extern census_context_get_status_type census_context_get_status_import;
+#define census_context_get_status census_context_get_status_import
+typedef void(*census_context_initialize_iterator_type)(const census_context *context, census_context_iterator *iterator);
+extern census_context_initialize_iterator_type census_context_initialize_iterator_import;
+#define census_context_initialize_iterator census_context_initialize_iterator_import
+typedef int(*census_context_next_tag_type)(census_context_iterator *iterator, census_tag *tag);
+extern census_context_next_tag_type census_context_next_tag_import;
+#define census_context_next_tag census_context_next_tag_import
+typedef int(*census_context_get_tag_type)(const census_context *context, const char *key, census_tag *tag);
+extern census_context_get_tag_type census_context_get_tag_import;
+#define census_context_get_tag census_context_get_tag_import
+typedef char *(*census_context_encode_type)(const census_context *context, char *buffer, size_t buf_size, size_t *print_buf_size, size_t *bin_buf_size);
+extern census_context_encode_type census_context_encode_import;
+#define census_context_encode census_context_encode_import
+typedef census_context *(*census_context_decode_type)(const char *buffer, size_t size, const char *bin_buffer, size_t bin_size);
+extern census_context_decode_type census_context_decode_import;
+#define census_context_decode census_context_decode_import
 typedef int(*census_trace_mask_type)(const census_context *context);
 extern census_trace_mask_type census_trace_mask_import;
 #define census_trace_mask census_trace_mask_import
@@ -112,37 +133,10 @@ extern census_get_trace_record_type census_get_trace_record_import;
 typedef void(*census_trace_scan_end_type)();
 extern census_trace_scan_end_type census_trace_scan_end_import;
 #define census_trace_scan_end census_trace_scan_end_import
-typedef census_tag_set *(*census_tag_set_create_type)(const census_tag_set *base, const census_tag *tags, int ntags, census_tag_set_create_status const **status);
-extern census_tag_set_create_type census_tag_set_create_import;
-#define census_tag_set_create census_tag_set_create_import
-typedef void(*census_tag_set_destroy_type)(census_tag_set *tags);
-extern census_tag_set_destroy_type census_tag_set_destroy_import;
-#define census_tag_set_destroy census_tag_set_destroy_import
-typedef const census_tag_set_create_status *(*census_tag_set_get_create_status_type)(const census_tag_set *tags);
-extern census_tag_set_get_create_status_type census_tag_set_get_create_status_import;
-#define census_tag_set_get_create_status census_tag_set_get_create_status_import
-typedef void(*census_tag_set_initialize_iterator_type)(const census_tag_set *tags, census_tag_set_iterator *iterator);
-extern census_tag_set_initialize_iterator_type census_tag_set_initialize_iterator_import;
-#define census_tag_set_initialize_iterator census_tag_set_initialize_iterator_import
-typedef int(*census_tag_set_next_tag_type)(census_tag_set_iterator *iterator, census_tag *tag);
-extern census_tag_set_next_tag_type census_tag_set_next_tag_import;
-#define census_tag_set_next_tag census_tag_set_next_tag_import
-typedef int(*census_tag_set_get_tag_by_key_type)(const census_tag_set *tags, const char *key, census_tag *tag);
-extern census_tag_set_get_tag_by_key_type census_tag_set_get_tag_by_key_import;
-#define census_tag_set_get_tag_by_key census_tag_set_get_tag_by_key_import
-typedef char *(*census_tag_set_encode_type)(const census_tag_set *tags, char *buffer, size_t buf_size, size_t *print_buf_size, size_t *bin_buf_size);
-extern census_tag_set_encode_type census_tag_set_encode_import;
-#define census_tag_set_encode census_tag_set_encode_import
-typedef census_tag_set *(*census_tag_set_decode_type)(const char *buffer, size_t size, const char *bin_buffer, size_t bin_size);
-extern census_tag_set_decode_type census_tag_set_decode_import;
-#define census_tag_set_decode census_tag_set_decode_import
-typedef census_tag_set *(*census_context_tag_set_type)(census_context *context);
-extern census_context_tag_set_type census_context_tag_set_import;
-#define census_context_tag_set census_context_tag_set_import
 typedef void(*census_record_values_type)(census_context *context, census_value *values, size_t nvalues);
 extern census_record_values_type census_record_values_import;
 #define census_record_values census_record_values_import
-typedef census_view *(*census_view_create_type)(uint32_t metric_id, const census_tag_set *tags, const census_aggregation *aggregations, size_t naggregations);
+typedef census_view *(*census_view_create_type)(uint32_t metric_id, const census_context *tags, const census_aggregation *aggregations, size_t naggregations);
 extern census_view_create_type census_view_create_import;
 #define census_view_create census_view_create_import
 typedef void(*census_view_delete_type)(census_view *view);
@@ -154,7 +148,7 @@ extern census_view_metric_type census_view_metric_import;
 typedef size_t(*census_view_naggregations_type)(const census_view *view);
 extern census_view_naggregations_type census_view_naggregations_import;
 #define census_view_naggregations census_view_naggregations_import
-typedef const census_tag_set *(*census_view_tags_type)(const census_view *view);
+typedef const census_context *(*census_view_tags_type)(const census_view *view);
 extern census_view_tags_type census_view_tags_import;
 #define census_view_tags census_view_tags_import
 typedef const census_aggregation *(*census_view_aggregrations_type)(const census_view *view);