Merge github.com:grpc/grpc into flowctl+millis

1 files changed, 311 insertions, 0 deletions

diff --git a/src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.cc b/src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.cc
new file mode 100644
index 0000000000..4d5fb2081c
--- /dev/null
+++ b/src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.cc
@@ -0,0 +1,311 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "src/core/ext/filters/client_channel/lb_policy/grpclb/load_balancer_api.h"
+#include "third_party/nanopb/pb_decode.h"
+#include "third_party/nanopb/pb_encode.h"
+
+#include <grpc/support/alloc.h>
+
+/* invoked once for every Server in ServerList */
+static bool count_serverlist(pb_istream_t *stream, const pb_field_t *field,
+                             void **arg) {
+  grpc_grpclb_serverlist *sl = (grpc_grpclb_serverlist *)*arg;
+  grpc_grpclb_server server;
+  if (!pb_decode(stream, grpc_lb_v1_Server_fields, &server)) {
+    gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(stream));
+    return false;
+  }
+  ++sl->num_servers;
+  return true;
+}
+
+typedef struct decode_serverlist_arg {
+  /* The decoding callback is invoked once per server in serverlist. Remember
+   * which index of the serverlist are we currently decoding */
+  size_t decoding_idx;
+  /* The decoded serverlist */
+  grpc_grpclb_serverlist *serverlist;
+} decode_serverlist_arg;
+
+/* invoked once for every Server in ServerList */
+static bool decode_serverlist(pb_istream_t *stream, const pb_field_t *field,
+                              void **arg) {
+  decode_serverlist_arg *dec_arg = (decode_serverlist_arg *)*arg;
+  GPR_ASSERT(dec_arg->serverlist->num_servers >= dec_arg->decoding_idx);
+  grpc_grpclb_server *server =
+      (grpc_grpclb_server *)gpr_zalloc(sizeof(grpc_grpclb_server));
+  if (!pb_decode(stream, grpc_lb_v1_Server_fields, server)) {
+    gpr_free(server);
+    gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(stream));
+    return false;
+  }
+  dec_arg->serverlist->servers[dec_arg->decoding_idx++] = server;
+  return true;
+}
+
+grpc_grpclb_request *grpc_grpclb_request_create(const char *lb_service_name) {
+  grpc_grpclb_request *req =
+      (grpc_grpclb_request *)gpr_malloc(sizeof(grpc_grpclb_request));
+  req->has_client_stats = false;
+  req->has_initial_request = true;
+  req->initial_request.has_name = true;
+  strncpy(req->initial_request.name, lb_service_name,
+          GRPC_GRPCLB_SERVICE_NAME_MAX_LENGTH);
+  return req;
+}
+
+static void populate_timestamp(gpr_timespec timestamp,
+                               struct _grpc_lb_v1_Timestamp *timestamp_pb) {
+  timestamp_pb->has_seconds = true;
+  timestamp_pb->seconds = timestamp.tv_sec;
+  timestamp_pb->has_nanos = true;
+  timestamp_pb->nanos = timestamp.tv_nsec;
+}
+
+static bool encode_string(pb_ostream_t *stream, const pb_field_t *field,
+                          void *const *arg) {
+  char *str = (char *)*arg;
+  if (!pb_encode_tag_for_field(stream, field)) return false;
+  return pb_encode_string(stream, (uint8_t *)str, strlen(str));
+}
+
+static bool encode_drops(pb_ostream_t *stream, const pb_field_t *field,
+                         void *const *arg) {
+  grpc_grpclb_dropped_call_counts *drop_entries =
+      (grpc_grpclb_dropped_call_counts *)*arg;
+  if (drop_entries == NULL) return true;
+  for (size_t i = 0; i < drop_entries->num_entries; ++i) {
+    if (!pb_encode_tag_for_field(stream, field)) return false;
+    grpc_lb_v1_ClientStatsPerToken drop_message;
+    drop_message.load_balance_token.funcs.encode = encode_string;
+    drop_message.load_balance_token.arg = drop_entries->token_counts[i].token;
+    drop_message.has_num_calls = true;
+    drop_message.num_calls = drop_entries->token_counts[i].count;
+    if (!pb_encode_submessage(stream, grpc_lb_v1_ClientStatsPerToken_fields,
+                              &drop_message)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+grpc_grpclb_request *grpc_grpclb_load_report_request_create_locked(
+    grpc_grpclb_client_stats *client_stats) {
+  grpc_grpclb_request *req =
+      (grpc_grpclb_request *)gpr_zalloc(sizeof(grpc_grpclb_request));
+  req->has_client_stats = true;
+  req->client_stats.has_timestamp = true;
+  populate_timestamp(gpr_now(GPR_CLOCK_REALTIME), &req->client_stats.timestamp);
+  req->client_stats.has_num_calls_started = true;
+  req->client_stats.has_num_calls_finished = true;
+  req->client_stats.has_num_calls_finished_with_client_failed_to_send = true;
+  req->client_stats.has_num_calls_finished_with_client_failed_to_send = true;
+  req->client_stats.has_num_calls_finished_known_received = true;
+  req->client_stats.calls_finished_with_drop.funcs.encode = encode_drops;
+  grpc_grpclb_client_stats_get_locked(
+      client_stats, &req->client_stats.num_calls_started,
+      &req->client_stats.num_calls_finished,
+      &req->client_stats.num_calls_finished_with_client_failed_to_send,
+      &req->client_stats.num_calls_finished_known_received,
+      (grpc_grpclb_dropped_call_counts **)&req->client_stats
+          .calls_finished_with_drop.arg);
+  return req;
+}
+
+grpc_slice grpc_grpclb_request_encode(const grpc_grpclb_request *request) {
+  size_t encoded_length;
+  pb_ostream_t sizestream;
+  pb_ostream_t outputstream;
+  grpc_slice slice;
+  memset(&sizestream, 0, sizeof(pb_ostream_t));
+  pb_encode(&sizestream, grpc_lb_v1_LoadBalanceRequest_fields, request);
+  encoded_length = sizestream.bytes_written;
+
+  slice = GRPC_SLICE_MALLOC(encoded_length);
+  outputstream =
+      pb_ostream_from_buffer(GRPC_SLICE_START_PTR(slice), encoded_length);
+  GPR_ASSERT(pb_encode(&outputstream, grpc_lb_v1_LoadBalanceRequest_fields,
+                       request) != 0);
+  return slice;
+}
+
+void grpc_grpclb_request_destroy(grpc_grpclb_request *request) {
+  if (request->has_client_stats) {
+    grpc_grpclb_dropped_call_counts *drop_entries =
+        (grpc_grpclb_dropped_call_counts *)
+            request->client_stats.calls_finished_with_drop.arg;
+    grpc_grpclb_dropped_call_counts_destroy(drop_entries);
+  }
+  gpr_free(request);
+}
+
+typedef grpc_lb_v1_LoadBalanceResponse grpc_grpclb_response;
+grpc_grpclb_initial_response *grpc_grpclb_initial_response_parse(
+    grpc_slice encoded_grpc_grpclb_response) {
+  pb_istream_t stream =
+      pb_istream_from_buffer(GRPC_SLICE_START_PTR(encoded_grpc_grpclb_response),
+                             GRPC_SLICE_LENGTH(encoded_grpc_grpclb_response));
+  grpc_grpclb_response res;
+  memset(&res, 0, sizeof(grpc_grpclb_response));
+  if (!pb_decode(&stream, grpc_lb_v1_LoadBalanceResponse_fields, &res)) {
+    gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(&stream));
+    return NULL;
+  }
+
+  if (!res.has_initial_response) return NULL;
+
+  grpc_grpclb_initial_response *initial_res =
+      (grpc_grpclb_initial_response *)gpr_malloc(
+          sizeof(grpc_grpclb_initial_response));
+  memcpy(initial_res, &res.initial_response,
+         sizeof(grpc_grpclb_initial_response));
+
+  return initial_res;
+}
+
+grpc_grpclb_serverlist *grpc_grpclb_response_parse_serverlist(
+    grpc_slice encoded_grpc_grpclb_response) {
+  pb_istream_t stream =
+      pb_istream_from_buffer(GRPC_SLICE_START_PTR(encoded_grpc_grpclb_response),
+                             GRPC_SLICE_LENGTH(encoded_grpc_grpclb_response));
+  pb_istream_t stream_at_start = stream;
+  grpc_grpclb_serverlist *sl =
+      (grpc_grpclb_serverlist *)gpr_zalloc(sizeof(grpc_grpclb_serverlist));
+  grpc_grpclb_response res;
+  memset(&res, 0, sizeof(grpc_grpclb_response));
+  // First pass: count number of servers.
+  res.server_list.servers.funcs.decode = count_serverlist;
+  res.server_list.servers.arg = sl;
+  bool status = pb_decode(&stream, grpc_lb_v1_LoadBalanceResponse_fields, &res);
+  if (!status) {
+    gpr_free(sl);
+    gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(&stream));
+    return NULL;
+  }
+  // Second pass: populate servers.
+  if (sl->num_servers > 0) {
+    sl->servers = (grpc_grpclb_server **)gpr_zalloc(
+        sizeof(grpc_grpclb_server *) * sl->num_servers);
+    decode_serverlist_arg decode_arg;
+    memset(&decode_arg, 0, sizeof(decode_arg));
+    decode_arg.serverlist = sl;
+    res.server_list.servers.funcs.decode = decode_serverlist;
+    res.server_list.servers.arg = &decode_arg;
+    status = pb_decode(&stream_at_start, grpc_lb_v1_LoadBalanceResponse_fields,
+                       &res);
+    if (!status) {
+      grpc_grpclb_destroy_serverlist(sl);
+      gpr_log(GPR_ERROR, "nanopb error: %s", PB_GET_ERROR(&stream));
+      return NULL;
+    }
+  }
+  if (res.server_list.has_expiration_interval) {
+    sl->expiration_interval = res.server_list.expiration_interval;
+  }
+  return sl;
+}
+
+void grpc_grpclb_destroy_serverlist(grpc_grpclb_serverlist *serverlist) {
+  if (serverlist == NULL) {
+    return;
+  }
+  for (size_t i = 0; i < serverlist->num_servers; i++) {
+    gpr_free(serverlist->servers[i]);
+  }
+  gpr_free(serverlist->servers);
+  gpr_free(serverlist);
+}
+
+grpc_grpclb_serverlist *grpc_grpclb_serverlist_copy(
+    const grpc_grpclb_serverlist *sl) {
+  grpc_grpclb_serverlist *copy =
+      (grpc_grpclb_serverlist *)gpr_zalloc(sizeof(grpc_grpclb_serverlist));
+  copy->num_servers = sl->num_servers;
+  memcpy(&copy->expiration_interval, &sl->expiration_interval,
+         sizeof(grpc_grpclb_duration));
+  copy->servers = (grpc_grpclb_server **)gpr_malloc(
+      sizeof(grpc_grpclb_server *) * sl->num_servers);
+  for (size_t i = 0; i < sl->num_servers; i++) {
+    copy->servers[i] =
+        (grpc_grpclb_server *)gpr_malloc(sizeof(grpc_grpclb_server));
+    memcpy(copy->servers[i], sl->servers[i], sizeof(grpc_grpclb_server));
+  }
+  return copy;
+}
+
+bool grpc_grpclb_serverlist_equals(const grpc_grpclb_serverlist *lhs,
+                                   const grpc_grpclb_serverlist *rhs) {
+  if (lhs == NULL || rhs == NULL) {
+    return false;
+  }
+  if (lhs->num_servers != rhs->num_servers) {
+    return false;
+  }
+  if (grpc_grpclb_duration_compare(&lhs->expiration_interval,
+                                   &rhs->expiration_interval) != 0) {
+    return false;
+  }
+  for (size_t i = 0; i < lhs->num_servers; i++) {
+    if (!grpc_grpclb_server_equals(lhs->servers[i], rhs->servers[i])) {
+      return false;
+    }
+  }
+  return true;
+}
+
+bool grpc_grpclb_server_equals(const grpc_grpclb_server *lhs,
+                               const grpc_grpclb_server *rhs) {
+  return memcmp(lhs, rhs, sizeof(grpc_grpclb_server)) == 0;
+}
+
+int grpc_grpclb_duration_compare(const grpc_grpclb_duration *lhs,
+                                 const grpc_grpclb_duration *rhs) {
+  GPR_ASSERT(lhs && rhs);
+  if (lhs->has_seconds && rhs->has_seconds) {
+    if (lhs->seconds < rhs->seconds) return -1;
+    if (lhs->seconds > rhs->seconds) return 1;
+  } else if (lhs->has_seconds) {
+    return 1;
+  } else if (rhs->has_seconds) {
+    return -1;
+  }
+
+  GPR_ASSERT(lhs->seconds == rhs->seconds);
+  if (lhs->has_nanos && rhs->has_nanos) {
+    if (lhs->nanos < rhs->nanos) return -1;
+    if (lhs->nanos > rhs->nanos) return 1;
+  } else if (lhs->has_nanos) {
+    return 1;
+  } else if (rhs->has_nanos) {
+    return -1;
+  }
+
+  return 0;
+}
+
+grpc_millis grpc_grpclb_duration_to_millis(grpc_grpclb_duration *duration_pb) {
+  return (grpc_millis)(
+      (duration_pb->has_seconds ? duration_pb->seconds : 0) * GPR_MS_PER_SEC +
+      (duration_pb->has_nanos ? duration_pb->nanos : 0) / GPR_NS_PER_MS);
+}
+
+void grpc_grpclb_initial_response_destroy(
+    grpc_grpclb_initial_response *response) {
+  gpr_free(response);
+}