prep work for enabling caching

Added new header grpc-payload-bin
Added new channel arg for setting max payload size
Ability to create a GET request in client filter
Ability to parse the payload from header in server filter.

5 files changed, 297 insertions, 200 deletions

diff --git a/src/core/lib/channel/http_client_filter.c b/src/core/lib/channel/http_client_filter.c
index a7a775cc53..87256184bb 100644
--- a/src/core/lib/channel/http_client_filter.c
+++ b/src/core/lib/channel/http_client_filter.c
@@ -50,6 +50,7 @@ typedef struct call_data {
   grpc_linked_mdelem te_trailers;
   grpc_linked_mdelem content_type;
   grpc_linked_mdelem user_agent;
+  grpc_linked_mdelem payload_bin;
 
   grpc_metadata_batch *recv_initial_metadata;
 
@@ -64,6 +65,7 @@ typedef struct call_data {
 typedef struct channel_data {
   grpc_mdelem *static_scheme;
   grpc_mdelem *user_agent;
+  size_t max_payload_size_for_get;
 } channel_data;
 
 typedef struct {
@@ -134,17 +136,43 @@ static void hc_mutate_op(grpc_call_element *elem,
   /* grab pointers to our data from the call element */
   call_data *calld = elem->call_data;
   channel_data *channeld = elem->channel_data;
+
+  /* Decide which HTTP VERB to use */
+  grpc_mdelem *method = GRPC_MDELEM_METHOD_POST;
+  if ((op->send_initial_metadata_flags &
+       GRPC_INITIAL_METADATA_CACHEABLE_REQUEST) &&
+      op->send_message != NULL &&
+      op->send_message->length < channeld->max_payload_size_for_get) {
+    method = GRPC_MDELEM_METHOD_GET;
+  } else if (op->send_initial_metadata_flags &
+             GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST) {
+    method = GRPC_MDELEM_METHOD_PUT;
+  }
+
+  if (method == GRPC_MDELEM_METHOD_GET) {
+    gpr_slice slice;
+    /* TODO (makdharma): extend code for messages with multiple slices */
+    if (grpc_byte_stream_next(NULL, op->send_message, &slice,
+                              op->send_message->length, NULL)) {
+      grpc_mdelem *payload_bin = grpc_mdelem_from_metadata_strings(
+          GRPC_MDSTR_GRPC_PAYLOAD_BIN,
+          grpc_mdstr_from_buffer(GPR_SLICE_START_PTR(slice),
+                                 GPR_SLICE_LENGTH(slice)));
+      grpc_metadata_batch_add_tail(op->send_initial_metadata,
+                                   &calld->payload_bin, payload_bin);
+    } else {
+      gpr_log(GPR_ERROR, "send_message could not be read");
+    }
+    op->send_message = NULL;
+  }
+
   if (op->send_initial_metadata != NULL) {
     grpc_metadata_batch_filter(op->send_initial_metadata, client_strip_filter,
                                elem);
     /* Send : prefixed headers, which have to be before any application
        layer headers. */
-    grpc_metadata_batch_add_head(
-        op->send_initial_metadata, &calld->method,
-        op->send_initial_metadata_flags &
-                GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST
-            ? GRPC_MDELEM_METHOD_PUT
-            : GRPC_MDELEM_METHOD_POST);
+    grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->method,
+                                 method);
     grpc_metadata_batch_add_head(op->send_initial_metadata, &calld->scheme,
                                  channeld->static_scheme);
     grpc_metadata_batch_add_tail(op->send_initial_metadata, &calld->te_trailers,
@@ -210,6 +238,22 @@ static grpc_mdelem *scheme_from_args(const grpc_channel_args *args) {
   return GRPC_MDELEM_SCHEME_HTTP;
 }
 
+static size_t max_payload_size_from_args(const grpc_channel_args *args) {
+  if (args != NULL) {
+    for (size_t i = 0; i < args->num_args; ++i) {
+      if (0 == strcmp(args->args[i].key, GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET)) {
+        if (args->args[i].type != GRPC_ARG_INTEGER) {
+          gpr_log(GPR_ERROR, "%s: must be an integer",
+                  GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET);
+        } else {
+          return args->args[i].value.integer;
+        }
+      }
+    }
+  }
+  return kMaxPayloadSizeForGet;
+}
+
 static grpc_mdstr *user_agent_from_args(const grpc_channel_args *args,
                                         const char *transport_name) {
   gpr_strvec v;
@@ -267,6 +311,8 @@ static void init_channel_elem(grpc_exec_ctx *exec_ctx,
   GPR_ASSERT(!args->is_last);
   GPR_ASSERT(args->optional_transport != NULL);
   chand->static_scheme = scheme_from_args(args->channel_args);
+  chand->max_payload_size_for_get =
+      max_payload_size_from_args(args->channel_args);
   chand->user_agent = grpc_mdelem_from_metadata_strings(
       GRPC_MDSTR_USER_AGENT,
       user_agent_from_args(args->channel_args,
diff --git a/src/core/lib/channel/http_client_filter.h b/src/core/lib/channel/http_client_filter.h
index 47081175ea..7b646b1c7c 100644
--- a/src/core/lib/channel/http_client_filter.h
+++ b/src/core/lib/channel/http_client_filter.h
@@ -41,4 +41,8 @@ extern const grpc_channel_filter grpc_http_client_filter;
 /* Channel arg to override the http2 :scheme header */
 #define GRPC_ARG_HTTP2_SCHEME "grpc.http2_scheme"
 
+/* Channel arg to determine maximum size of payload eligable for GET request */
+#define GRPC_ARG_MAX_PAYLOAD_SIZE_FOR_GET "grpc.max_payload_size_for_get"
+static const size_t kMaxPayloadSizeForGet = 2048;
+
 #endif /* GRPC_CORE_LIB_CHANNEL_HTTP_CLIENT_FILTER_H */
diff --git a/src/core/lib/channel/http_server_filter.c b/src/core/lib/channel/http_server_filter.c
index 5ce51f9016..a767af57e9 100644
--- a/src/core/lib/channel/http_server_filter.c
+++ b/src/core/lib/channel/http_server_filter.c
@@ -49,6 +49,7 @@ typedef struct call_data {
   uint8_t seen_scheme;
   uint8_t seen_te_trailers;
   uint8_t seen_authority;
+  uint8_t seen_payload_bin;
   grpc_linked_mdelem status;
   grpc_linked_mdelem content_type;
 
@@ -56,10 +57,20 @@ typedef struct call_data {
   bool *recv_idempotent_request;
   /** Closure to call when finished with the hs_on_recv hook */
   grpc_closure *on_done_recv;
+  /** Closure to call when we retrieve read message from the payload-bin header
+   */
+  grpc_closure *recv_message_ready;
+  grpc_closure *on_complete;
+  grpc_byte_stream **pp_recv_message;
+  gpr_slice_buffer read_slice_buffer;
+  grpc_slice_buffer_stream read_stream;
+
   /** Receive closures are chained: we inject this closure as the on_done_recv
       up-call on transport_op, and remember to call our on_done_recv member
       after handling it. */
   grpc_closure hs_on_recv;
+  grpc_closure hs_on_complete;
+  grpc_closure hs_recv_message_ready;
 } call_data;
 
 typedef struct channel_data { uint8_t unused; } channel_data;
@@ -76,14 +87,14 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
 
   /* Check if it is one of the headers we care about. */
   if (md == GRPC_MDELEM_TE_TRAILERS || md == GRPC_MDELEM_METHOD_POST ||
-      md == GRPC_MDELEM_METHOD_PUT || md == GRPC_MDELEM_SCHEME_HTTP ||
-      md == GRPC_MDELEM_SCHEME_HTTPS ||
+      md == GRPC_MDELEM_METHOD_PUT || md == GRPC_MDELEM_METHOD_GET ||
+      md == GRPC_MDELEM_SCHEME_HTTP || md == GRPC_MDELEM_SCHEME_HTTPS ||
       md == GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC) {
     /* swallow it */
     if (md == GRPC_MDELEM_METHOD_POST) {
       calld->seen_method = 1;
       *calld->recv_idempotent_request = false;
-    } else if (md == GRPC_MDELEM_METHOD_PUT) {
+    } else if (md == GRPC_MDELEM_METHOD_PUT || md == GRPC_MDELEM_METHOD_GET) {
       calld->seen_method = 1;
       *calld->recv_idempotent_request = true;
     } else if (md->key == GRPC_MDSTR_SCHEME) {
@@ -137,6 +148,16 @@ static grpc_mdelem *server_filter(void *user_data, grpc_mdelem *md) {
         GRPC_MDSTR_AUTHORITY, GRPC_MDSTR_REF(md->value));
     calld->seen_authority = 1;
     return authority;
+  } else if (md->key == GRPC_MDSTR_GRPC_PAYLOAD_BIN) {
+    /* Retrieve the payload from the value of the 'grpc-internal-payload-bin'
+       header field */
+    calld->seen_payload_bin = 1;
+    gpr_slice_buffer_init(&calld->read_slice_buffer);
+    gpr_slice_buffer_add(&calld->read_slice_buffer,
+                         gpr_slice_ref(md->value->slice));
+    grpc_slice_buffer_stream_init(&calld->read_stream,
+                                  &calld->read_slice_buffer, 0);
+    return NULL;
   } else {
     return md;
   }
@@ -189,6 +210,33 @@ static void hs_on_recv(grpc_exec_ctx *exec_ctx, void *user_data,
   GRPC_ERROR_UNREF(err);
 }
 
+static void hs_on_complete(grpc_exec_ctx *exec_ctx, void *user_data,
+                           grpc_error *err) {
+  grpc_call_element *elem = user_data;
+  call_data *calld = elem->call_data;
+  /* Call recv_message_ready if we got the payload via the header field */
+  if (calld->seen_payload_bin && calld->recv_message_ready != NULL) {
+    *calld->pp_recv_message = (grpc_byte_stream *)&calld->read_stream;
+    calld->recv_message_ready->cb(exec_ctx, calld->recv_message_ready->cb_arg,
+                                  err);
+    calld->recv_message_ready = NULL;
+  }
+  calld->on_complete->cb(exec_ctx, calld->on_complete->cb_arg, err);
+}
+
+static void hs_recv_message_ready(grpc_exec_ctx *exec_ctx, void *user_data,
+                                  grpc_error *err) {
+  grpc_call_element *elem = user_data;
+  call_data *calld = elem->call_data;
+  if (calld->seen_payload_bin) {
+    /* do nothing. This is probably a GET request, and payload will be returned
+    in hs_on_complete callback. */
+  } else {
+    calld->recv_message_ready->cb(exec_ctx, calld->recv_message_ready->cb_arg,
+                                  err);
+  }
+}
+
 static void hs_mutate_op(grpc_call_element *elem,
                          grpc_transport_stream_op *op) {
   /* grab pointers to our data from the call element */
@@ -203,6 +251,11 @@ static void hs_mutate_op(grpc_call_element *elem,
         GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC);
   }
 
+  if (op->on_complete) {
+    calld->on_complete = op->on_complete;
+    op->on_complete = &calld->hs_on_complete;
+  }
+
   if (op->recv_initial_metadata) {
     /* substitute our callback for the higher callback */
     GPR_ASSERT(op->recv_idempotent_request != NULL);
@@ -211,6 +264,14 @@ static void hs_mutate_op(grpc_call_element *elem,
     calld->on_done_recv = op->recv_initial_metadata_ready;
     op->recv_initial_metadata_ready = &calld->hs_on_recv;
   }
+
+  if (op->recv_message) {
+    calld->recv_message_ready = op->recv_message_ready;
+    calld->pp_recv_message = op->recv_message;
+    if (op->recv_message_ready) {
+      op->recv_message_ready = &calld->hs_recv_message_ready;
+    }
+  }
 }
 
 static void hs_start_transport_op(grpc_exec_ctx *exec_ctx,
@@ -232,6 +293,8 @@ static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
   /* initialize members */
   memset(calld, 0, sizeof(*calld));
   grpc_closure_init(&calld->hs_on_recv, hs_on_recv, elem);
+  grpc_closure_init(&calld->hs_on_complete, hs_on_complete, elem);
+  grpc_closure_init(&calld->hs_recv_message_ready, hs_recv_message_ready, elem);
   return GRPC_ERROR_NONE;
 }
 
diff --git a/src/core/lib/transport/static_metadata.c b/src/core/lib/transport/static_metadata.c
index 8f3e5b5b40..7d3c5f50b8 100644
--- a/src/core/lib/transport/static_metadata.c
+++ b/src/core/lib/transport/static_metadata.c
@@ -1,11 +1,11 @@
 /*
  * Copyright 2015, 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
@@ -15,7 +15,7 @@
  *     * 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
@@ -31,10 +31,10 @@
 
 /*
  * WARNING: Auto-generated code.
- *
+ * 
  * To make changes to this file, change
  * tools/codegen/core/gen_static_metadata.py, and then re-run it.
- *
+ * 
  * See metadata.h for an explanation of the interface here, and metadata.c for
  * an explanation of what's going on.
  */
@@ -45,115 +45,110 @@ grpc_mdstr grpc_static_mdstr_table[GRPC_STATIC_MDSTR_COUNT];
 
 grpc_mdelem grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT];
 uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT] = {
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 4, 8, 6, 2, 4, 8, 6, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
+  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,8,6,2,4,8,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+};
 
-const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT * 2] =
-    {11, 33, 10, 33, 12, 33, 12, 49, 13, 33, 14, 33, 15, 33, 16, 33, 17, 33,
-     19, 33, 20, 33, 21, 33, 22, 33, 23, 33, 24, 33, 25, 33, 26, 33, 27, 33,
-     28, 18, 28, 33, 29, 33, 30, 33, 34, 33, 35, 33, 36, 33, 37, 33, 40, 31,
-     40, 32, 40, 48, 40, 53, 40, 54, 40, 55, 40, 56, 42, 31, 42, 48, 42, 53,
-     45, 0,  45, 1,  45, 2,  50, 33, 57, 33, 58, 33, 59, 33, 60, 33, 61, 33,
-     62, 33, 63, 33, 64, 33, 65, 33, 66, 33, 67, 33, 68, 38, 68, 70, 68, 73,
-     69, 81, 69, 82, 71, 33, 72, 33, 74, 33, 75, 33, 76, 33, 77, 33, 78, 39,
-     78, 51, 78, 52, 79, 33, 80, 33, 83, 3,  83, 4,  83, 5,  83, 6,  83, 7,
-     83, 8,  83, 9,  84, 33, 85, 86, 87, 33, 88, 33, 89, 33, 90, 33, 91, 33};
+const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT*2] = {
+11,33,10,33,12,33,12,50,13,33,14,33,15,33,16,33,17,33,19,33,20,33,21,33,22,33,23,33,24,33,25,33,26,33,27,33,28,18,28,33,29,33,30,33,34,33,35,33,36,33,37,33,40,31,40,32,40,49,40,54,40,55,40,56,40,57,42,31,42,49,42,54,46,0,46,1,46,2,51,33,58,33,59,33,60,33,61,33,62,33,63,33,64,33,65,33,66,33,67,33,68,33,69,38,69,71,69,74,70,82,70,83,72,33,73,33,75,33,76,33,77,33,78,33,79,39,79,52,79,53,80,33,81,33,84,3,84,4,84,5,84,6,84,7,84,8,84,9,85,33,86,87,88,33,89,33,90,33,91,33,92,33
+};
 
 const char *const grpc_static_metadata_strings[GRPC_STATIC_MDSTR_COUNT] = {
-    "0",
-    "1",
-    "2",
-    "200",
-    "204",
-    "206",
-    "304",
-    "400",
-    "404",
-    "500",
-    "accept",
-    "accept-charset",
-    "accept-encoding",
-    "accept-language",
-    "accept-ranges",
-    "access-control-allow-origin",
-    "age",
-    "allow",
-    "application/grpc",
-    ":authority",
-    "authorization",
-    "cache-control",
-    "content-disposition",
-    "content-encoding",
-    "content-language",
-    "content-length",
-    "content-location",
-    "content-range",
-    "content-type",
-    "cookie",
-    "date",
-    "deflate",
-    "deflate,gzip",
-    "",
-    "etag",
-    "expect",
-    "expires",
-    "from",
-    "GET",
-    "grpc",
-    "grpc-accept-encoding",
-    "grpc-census-bin",
-    "grpc-encoding",
-    "grpc-internal-encoding-request",
-    "grpc-message",
-    "grpc-status",
-    "grpc-timeout",
-    "grpc-tracing-bin",
-    "gzip",
-    "gzip, deflate",
-    "host",
-    "http",
-    "https",
-    "identity",
-    "identity,deflate",
-    "identity,deflate,gzip",
-    "identity,gzip",
-    "if-match",
-    "if-modified-since",
-    "if-none-match",
-    "if-range",
-    "if-unmodified-since",
-    "last-modified",
-    "link",
-    "load-reporting-initial",
-    "load-reporting-trailing",
-    "location",
-    "max-forwards",
-    ":method",
-    ":path",
-    "POST",
-    "proxy-authenticate",
-    "proxy-authorization",
-    "PUT",
-    "range",
-    "referer",
-    "refresh",
-    "retry-after",
-    ":scheme",
-    "server",
-    "set-cookie",
-    "/",
-    "/index.html",
-    ":status",
-    "strict-transport-security",
-    "te",
-    "trailers",
-    "transfer-encoding",
-    "user-agent",
-    "vary",
-    "via",
-    "www-authenticate"};
+  "0",
+  "1",
+  "2",
+  "200",
+  "204",
+  "206",
+  "304",
+  "400",
+  "404",
+  "500",
+  "accept",
+  "accept-charset",
+  "accept-encoding",
+  "accept-language",
+  "accept-ranges",
+  "access-control-allow-origin",
+  "age",
+  "allow",
+  "application/grpc",
+  ":authority",
+  "authorization",
+  "cache-control",
+  "content-disposition",
+  "content-encoding",
+  "content-language",
+  "content-length",
+  "content-location",
+  "content-range",
+  "content-type",
+  "cookie",
+  "date",
+  "deflate",
+  "deflate,gzip",
+  "",
+  "etag",
+  "expect",
+  "expires",
+  "from",
+  "GET",
+  "grpc",
+  "grpc-accept-encoding",
+  "grpc-census-bin",
+  "grpc-encoding",
+  "grpc-internal-encoding-request",
+  "grpc-message",
+  "grpc-payload-bin",
+  "grpc-status",
+  "grpc-timeout",
+  "grpc-tracing-bin",
+  "gzip",
+  "gzip, deflate",
+  "host",
+  "http",
+  "https",
+  "identity",
+  "identity,deflate",
+  "identity,deflate,gzip",
+  "identity,gzip",
+  "if-match",
+  "if-modified-since",
+  "if-none-match",
+  "if-range",
+  "if-unmodified-since",
+  "last-modified",
+  "link",
+  "load-reporting-initial",
+  "load-reporting-trailing",
+  "location",
+  "max-forwards",
+  ":method",
+  ":path",
+  "POST",
+  "proxy-authenticate",
+  "proxy-authorization",
+  "PUT",
+  "range",
+  "referer",
+  "refresh",
+  "retry-after",
+  ":scheme",
+  "server",
+  "set-cookie",
+  "/",
+  "/index.html",
+  ":status",
+  "strict-transport-security",
+  "te",
+  "trailers",
+  "transfer-encoding",
+  "user-agent",
+  "vary",
+  "via",
+  "www-authenticate"
+};
+
+const uint8_t grpc_static_accept_encoding_metadata[8] = {
+0,29,26,30,28,32,27,31
+};
 
-const uint8_t grpc_static_accept_encoding_metadata[8] = {0,  29, 26, 30,
-                                                         28, 32, 27, 31};
diff --git a/src/core/lib/transport/static_metadata.h b/src/core/lib/transport/static_metadata.h
index b51bacac50..013faf7a5a 100644
--- a/src/core/lib/transport/static_metadata.h
+++ b/src/core/lib/transport/static_metadata.h
@@ -1,11 +1,11 @@
 /*
  * Copyright 2015, 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
@@ -15,7 +15,7 @@
  *     * 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
@@ -31,10 +31,10 @@
 
 /*
  * WARNING: Auto-generated code.
- *
+ * 
  * To make changes to this file, change
  * tools/codegen/core/gen_static_metadata.py, and then re-run it.
- *
+ * 
  * See metadata.h for an explanation of the interface here, and metadata.c for
  * an explanation of what's going on.
  */
@@ -44,7 +44,7 @@
 
 #include "src/core/lib/transport/metadata.h"
 
-#define GRPC_STATIC_MDSTR_COUNT 92
+#define GRPC_STATIC_MDSTR_COUNT 93
 extern grpc_mdstr grpc_static_mdstr_table[GRPC_STATIC_MDSTR_COUNT];
 /* "0" */
 #define GRPC_MDSTR_0 (&grpc_static_mdstr_table[0])
@@ -136,101 +136,102 @@ extern grpc_mdstr grpc_static_mdstr_table[GRPC_STATIC_MDSTR_COUNT];
 #define GRPC_MDSTR_GRPC_INTERNAL_ENCODING_REQUEST (&grpc_static_mdstr_table[43])
 /* "grpc-message" */
 #define GRPC_MDSTR_GRPC_MESSAGE (&grpc_static_mdstr_table[44])
+/* "grpc-payload-bin" */
+#define GRPC_MDSTR_GRPC_PAYLOAD_BIN (&grpc_static_mdstr_table[45])
 /* "grpc-status" */
-#define GRPC_MDSTR_GRPC_STATUS (&grpc_static_mdstr_table[45])
+#define GRPC_MDSTR_GRPC_STATUS (&grpc_static_mdstr_table[46])
 /* "grpc-timeout" */
-#define GRPC_MDSTR_GRPC_TIMEOUT (&grpc_static_mdstr_table[46])
+#define GRPC_MDSTR_GRPC_TIMEOUT (&grpc_static_mdstr_table[47])
 /* "grpc-tracing-bin" */
-#define GRPC_MDSTR_GRPC_TRACING_BIN (&grpc_static_mdstr_table[47])
+#define GRPC_MDSTR_GRPC_TRACING_BIN (&grpc_static_mdstr_table[48])
 /* "gzip" */
-#define GRPC_MDSTR_GZIP (&grpc_static_mdstr_table[48])
+#define GRPC_MDSTR_GZIP (&grpc_static_mdstr_table[49])
 /* "gzip, deflate" */
-#define GRPC_MDSTR_GZIP_COMMA_DEFLATE (&grpc_static_mdstr_table[49])
+#define GRPC_MDSTR_GZIP_COMMA_DEFLATE (&grpc_static_mdstr_table[50])
 /* "host" */
-#define GRPC_MDSTR_HOST (&grpc_static_mdstr_table[50])
+#define GRPC_MDSTR_HOST (&grpc_static_mdstr_table[51])
 /* "http" */
-#define GRPC_MDSTR_HTTP (&grpc_static_mdstr_table[51])
+#define GRPC_MDSTR_HTTP (&grpc_static_mdstr_table[52])
 /* "https" */
-#define GRPC_MDSTR_HTTPS (&grpc_static_mdstr_table[52])
+#define GRPC_MDSTR_HTTPS (&grpc_static_mdstr_table[53])
 /* "identity" */
-#define GRPC_MDSTR_IDENTITY (&grpc_static_mdstr_table[53])
+#define GRPC_MDSTR_IDENTITY (&grpc_static_mdstr_table[54])
 /* "identity,deflate" */
-#define GRPC_MDSTR_IDENTITY_COMMA_DEFLATE (&grpc_static_mdstr_table[54])
+#define GRPC_MDSTR_IDENTITY_COMMA_DEFLATE (&grpc_static_mdstr_table[55])
 /* "identity,deflate,gzip" */
-#define GRPC_MDSTR_IDENTITY_COMMA_DEFLATE_COMMA_GZIP \
-  (&grpc_static_mdstr_table[55])
+#define GRPC_MDSTR_IDENTITY_COMMA_DEFLATE_COMMA_GZIP (&grpc_static_mdstr_table[56])
 /* "identity,gzip" */
-#define GRPC_MDSTR_IDENTITY_COMMA_GZIP (&grpc_static_mdstr_table[56])
+#define GRPC_MDSTR_IDENTITY_COMMA_GZIP (&grpc_static_mdstr_table[57])
 /* "if-match" */
-#define GRPC_MDSTR_IF_MATCH (&grpc_static_mdstr_table[57])
+#define GRPC_MDSTR_IF_MATCH (&grpc_static_mdstr_table[58])
 /* "if-modified-since" */
-#define GRPC_MDSTR_IF_MODIFIED_SINCE (&grpc_static_mdstr_table[58])
+#define GRPC_MDSTR_IF_MODIFIED_SINCE (&grpc_static_mdstr_table[59])
 /* "if-none-match" */
-#define GRPC_MDSTR_IF_NONE_MATCH (&grpc_static_mdstr_table[59])
+#define GRPC_MDSTR_IF_NONE_MATCH (&grpc_static_mdstr_table[60])
 /* "if-range" */
-#define GRPC_MDSTR_IF_RANGE (&grpc_static_mdstr_table[60])
+#define GRPC_MDSTR_IF_RANGE (&grpc_static_mdstr_table[61])
 /* "if-unmodified-since" */
-#define GRPC_MDSTR_IF_UNMODIFIED_SINCE (&grpc_static_mdstr_table[61])
+#define GRPC_MDSTR_IF_UNMODIFIED_SINCE (&grpc_static_mdstr_table[62])
 /* "last-modified" */
-#define GRPC_MDSTR_LAST_MODIFIED (&grpc_static_mdstr_table[62])
+#define GRPC_MDSTR_LAST_MODIFIED (&grpc_static_mdstr_table[63])
 /* "link" */
-#define GRPC_MDSTR_LINK (&grpc_static_mdstr_table[63])
+#define GRPC_MDSTR_LINK (&grpc_static_mdstr_table[64])
 /* "load-reporting-initial" */
-#define GRPC_MDSTR_LOAD_REPORTING_INITIAL (&grpc_static_mdstr_table[64])
+#define GRPC_MDSTR_LOAD_REPORTING_INITIAL (&grpc_static_mdstr_table[65])
 /* "load-reporting-trailing" */
-#define GRPC_MDSTR_LOAD_REPORTING_TRAILING (&grpc_static_mdstr_table[65])
+#define GRPC_MDSTR_LOAD_REPORTING_TRAILING (&grpc_static_mdstr_table[66])
 /* "location" */
-#define GRPC_MDSTR_LOCATION (&grpc_static_mdstr_table[66])
+#define GRPC_MDSTR_LOCATION (&grpc_static_mdstr_table[67])
 /* "max-forwards" */
-#define GRPC_MDSTR_MAX_FORWARDS (&grpc_static_mdstr_table[67])
+#define GRPC_MDSTR_MAX_FORWARDS (&grpc_static_mdstr_table[68])
 /* ":method" */
-#define GRPC_MDSTR_METHOD (&grpc_static_mdstr_table[68])
+#define GRPC_MDSTR_METHOD (&grpc_static_mdstr_table[69])
 /* ":path" */
-#define GRPC_MDSTR_PATH (&grpc_static_mdstr_table[69])
+#define GRPC_MDSTR_PATH (&grpc_static_mdstr_table[70])
 /* "POST" */
-#define GRPC_MDSTR_POST (&grpc_static_mdstr_table[70])
+#define GRPC_MDSTR_POST (&grpc_static_mdstr_table[71])
 /* "proxy-authenticate" */
-#define GRPC_MDSTR_PROXY_AUTHENTICATE (&grpc_static_mdstr_table[71])
+#define GRPC_MDSTR_PROXY_AUTHENTICATE (&grpc_static_mdstr_table[72])
 /* "proxy-authorization" */
-#define GRPC_MDSTR_PROXY_AUTHORIZATION (&grpc_static_mdstr_table[72])
+#define GRPC_MDSTR_PROXY_AUTHORIZATION (&grpc_static_mdstr_table[73])
 /* "PUT" */
-#define GRPC_MDSTR_PUT (&grpc_static_mdstr_table[73])
+#define GRPC_MDSTR_PUT (&grpc_static_mdstr_table[74])
 /* "range" */
-#define GRPC_MDSTR_RANGE (&grpc_static_mdstr_table[74])
+#define GRPC_MDSTR_RANGE (&grpc_static_mdstr_table[75])
 /* "referer" */
-#define GRPC_MDSTR_REFERER (&grpc_static_mdstr_table[75])
+#define GRPC_MDSTR_REFERER (&grpc_static_mdstr_table[76])
 /* "refresh" */
-#define GRPC_MDSTR_REFRESH (&grpc_static_mdstr_table[76])
+#define GRPC_MDSTR_REFRESH (&grpc_static_mdstr_table[77])
 /* "retry-after" */
-#define GRPC_MDSTR_RETRY_AFTER (&grpc_static_mdstr_table[77])
+#define GRPC_MDSTR_RETRY_AFTER (&grpc_static_mdstr_table[78])
 /* ":scheme" */
-#define GRPC_MDSTR_SCHEME (&grpc_static_mdstr_table[78])
+#define GRPC_MDSTR_SCHEME (&grpc_static_mdstr_table[79])
 /* "server" */
-#define GRPC_MDSTR_SERVER (&grpc_static_mdstr_table[79])
+#define GRPC_MDSTR_SERVER (&grpc_static_mdstr_table[80])
 /* "set-cookie" */
-#define GRPC_MDSTR_SET_COOKIE (&grpc_static_mdstr_table[80])
+#define GRPC_MDSTR_SET_COOKIE (&grpc_static_mdstr_table[81])
 /* "/" */
-#define GRPC_MDSTR_SLASH (&grpc_static_mdstr_table[81])
+#define GRPC_MDSTR_SLASH (&grpc_static_mdstr_table[82])
 /* "/index.html" */
-#define GRPC_MDSTR_SLASH_INDEX_DOT_HTML (&grpc_static_mdstr_table[82])
+#define GRPC_MDSTR_SLASH_INDEX_DOT_HTML (&grpc_static_mdstr_table[83])
 /* ":status" */
-#define GRPC_MDSTR_STATUS (&grpc_static_mdstr_table[83])
+#define GRPC_MDSTR_STATUS (&grpc_static_mdstr_table[84])
 /* "strict-transport-security" */
-#define GRPC_MDSTR_STRICT_TRANSPORT_SECURITY (&grpc_static_mdstr_table[84])
+#define GRPC_MDSTR_STRICT_TRANSPORT_SECURITY (&grpc_static_mdstr_table[85])
 /* "te" */
-#define GRPC_MDSTR_TE (&grpc_static_mdstr_table[85])
+#define GRPC_MDSTR_TE (&grpc_static_mdstr_table[86])
 /* "trailers" */
-#define GRPC_MDSTR_TRAILERS (&grpc_static_mdstr_table[86])
+#define GRPC_MDSTR_TRAILERS (&grpc_static_mdstr_table[87])
 /* "transfer-encoding" */
-#define GRPC_MDSTR_TRANSFER_ENCODING (&grpc_static_mdstr_table[87])
+#define GRPC_MDSTR_TRANSFER_ENCODING (&grpc_static_mdstr_table[88])
 /* "user-agent" */
-#define GRPC_MDSTR_USER_AGENT (&grpc_static_mdstr_table[88])
+#define GRPC_MDSTR_USER_AGENT (&grpc_static_mdstr_table[89])
 /* "vary" */
-#define GRPC_MDSTR_VARY (&grpc_static_mdstr_table[89])
+#define GRPC_MDSTR_VARY (&grpc_static_mdstr_table[90])
 /* "via" */
-#define GRPC_MDSTR_VIA (&grpc_static_mdstr_table[90])
+#define GRPC_MDSTR_VIA (&grpc_static_mdstr_table[91])
 /* "www-authenticate" */
-#define GRPC_MDSTR_WWW_AUTHENTICATE (&grpc_static_mdstr_table[91])
+#define GRPC_MDSTR_WWW_AUTHENTICATE (&grpc_static_mdstr_table[92])
 
 #define GRPC_STATIC_MDELEM_COUNT 81
 extern grpc_mdelem grpc_static_mdelem_table[GRPC_STATIC_MDELEM_COUNT];
@@ -242,15 +243,13 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* "accept-encoding": "" */
 #define GRPC_MDELEM_ACCEPT_ENCODING_EMPTY (&grpc_static_mdelem_table[2])
 /* "accept-encoding": "gzip, deflate" */
-#define GRPC_MDELEM_ACCEPT_ENCODING_GZIP_COMMA_DEFLATE \
-  (&grpc_static_mdelem_table[3])
+#define GRPC_MDELEM_ACCEPT_ENCODING_GZIP_COMMA_DEFLATE (&grpc_static_mdelem_table[3])
 /* "accept-language": "" */
 #define GRPC_MDELEM_ACCEPT_LANGUAGE_EMPTY (&grpc_static_mdelem_table[4])
 /* "accept-ranges": "" */
 #define GRPC_MDELEM_ACCEPT_RANGES_EMPTY (&grpc_static_mdelem_table[5])
 /* "access-control-allow-origin": "" */
-#define GRPC_MDELEM_ACCESS_CONTROL_ALLOW_ORIGIN_EMPTY \
-  (&grpc_static_mdelem_table[6])
+#define GRPC_MDELEM_ACCESS_CONTROL_ALLOW_ORIGIN_EMPTY (&grpc_static_mdelem_table[6])
 /* "age": "" */
 #define GRPC_MDELEM_AGE_EMPTY (&grpc_static_mdelem_table[7])
 /* "allow": "" */
@@ -274,8 +273,7 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* "content-range": "" */
 #define GRPC_MDELEM_CONTENT_RANGE_EMPTY (&grpc_static_mdelem_table[17])
 /* "content-type": "application/grpc" */
-#define GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC \
-  (&grpc_static_mdelem_table[18])
+#define GRPC_MDELEM_CONTENT_TYPE_APPLICATION_SLASH_GRPC (&grpc_static_mdelem_table[18])
 /* "content-type": "" */
 #define GRPC_MDELEM_CONTENT_TYPE_EMPTY (&grpc_static_mdelem_table[19])
 /* "cookie": "" */
@@ -293,22 +291,17 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* "grpc-accept-encoding": "deflate" */
 #define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_DEFLATE (&grpc_static_mdelem_table[26])
 /* "grpc-accept-encoding": "deflate,gzip" */
-#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_DEFLATE_COMMA_GZIP \
-  (&grpc_static_mdelem_table[27])
+#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_DEFLATE_COMMA_GZIP (&grpc_static_mdelem_table[27])
 /* "grpc-accept-encoding": "gzip" */
 #define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_GZIP (&grpc_static_mdelem_table[28])
 /* "grpc-accept-encoding": "identity" */
-#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY \
-  (&grpc_static_mdelem_table[29])
+#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY (&grpc_static_mdelem_table[29])
 /* "grpc-accept-encoding": "identity,deflate" */
-#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY_COMMA_DEFLATE \
-  (&grpc_static_mdelem_table[30])
+#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY_COMMA_DEFLATE (&grpc_static_mdelem_table[30])
 /* "grpc-accept-encoding": "identity,deflate,gzip" */
-#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY_COMMA_DEFLATE_COMMA_GZIP \
-  (&grpc_static_mdelem_table[31])
+#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY_COMMA_DEFLATE_COMMA_GZIP (&grpc_static_mdelem_table[31])
 /* "grpc-accept-encoding": "identity,gzip" */
-#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY_COMMA_GZIP \
-  (&grpc_static_mdelem_table[32])
+#define GRPC_MDELEM_GRPC_ACCEPT_ENCODING_IDENTITY_COMMA_GZIP (&grpc_static_mdelem_table[32])
 /* "grpc-encoding": "deflate" */
 #define GRPC_MDELEM_GRPC_ENCODING_DEFLATE (&grpc_static_mdelem_table[33])
 /* "grpc-encoding": "gzip" */
@@ -340,8 +333,7 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* "load-reporting-initial": "" */
 #define GRPC_MDELEM_LOAD_REPORTING_INITIAL_EMPTY (&grpc_static_mdelem_table[47])
 /* "load-reporting-trailing": "" */
-#define GRPC_MDELEM_LOAD_REPORTING_TRAILING_EMPTY \
-  (&grpc_static_mdelem_table[48])
+#define GRPC_MDELEM_LOAD_REPORTING_TRAILING_EMPTY (&grpc_static_mdelem_table[48])
 /* "location": "" */
 #define GRPC_MDELEM_LOCATION_EMPTY (&grpc_static_mdelem_table[49])
 /* "max-forwards": "" */
@@ -393,8 +385,7 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* ":status": "500" */
 #define GRPC_MDELEM_STATUS_500 (&grpc_static_mdelem_table[73])
 /* "strict-transport-security": "" */
-#define GRPC_MDELEM_STRICT_TRANSPORT_SECURITY_EMPTY \
-  (&grpc_static_mdelem_table[74])
+#define GRPC_MDELEM_STRICT_TRANSPORT_SECURITY_EMPTY (&grpc_static_mdelem_table[74])
 /* "te": "trailers" */
 #define GRPC_MDELEM_TE_TRAILERS (&grpc_static_mdelem_table[75])
 /* "transfer-encoding": "" */
@@ -408,10 +399,8 @@ extern uintptr_t grpc_static_mdelem_user_data[GRPC_STATIC_MDELEM_COUNT];
 /* "www-authenticate": "" */
 #define GRPC_MDELEM_WWW_AUTHENTICATE_EMPTY (&grpc_static_mdelem_table[80])
 
-extern const uint8_t
-    grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT * 2];
+extern const uint8_t grpc_static_metadata_elem_indices[GRPC_STATIC_MDELEM_COUNT*2];
 extern const char *const grpc_static_metadata_strings[GRPC_STATIC_MDSTR_COUNT];
 extern const uint8_t grpc_static_accept_encoding_metadata[8];
-#define GRPC_MDELEM_ACCEPT_ENCODING_FOR_ALGORITHMS(algs) \
-  (&grpc_static_mdelem_table[grpc_static_accept_encoding_metadata[(algs)]])
+#define GRPC_MDELEM_ACCEPT_ENCODING_FOR_ALGORITHMS(algs) (&grpc_static_mdelem_table[grpc_static_accept_encoding_metadata[(algs)]])
 #endif /* GRPC_CORE_LIB_TRANSPORT_STATIC_METADATA_H */