--- /dev/null
+/*
+ *
+ * Copyright 2017 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 <grpc/support/port_platform.h>
+
+#include "src/core/ext/filters/client_channel/lb_policy/grpclb/client_load_reporting_filter.h"
+
+#include <string.h>
+
+#include <grpc/support/atm.h>
+#include <grpc/support/log.h>
+
+#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.h"
+#include "src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb_client_stats.h"
+#include "src/core/lib/iomgr/error.h"
+#include "src/core/lib/profiling/timers.h"
+
+static grpc_error* init_channel_elem(grpc_channel_element* elem,
+ grpc_channel_element_args* args) {
+ return GRPC_ERROR_NONE;
+}
+
+static void destroy_channel_elem(grpc_channel_element* elem) {}
+
+namespace {
+
+struct call_data {
+ // Stats object to update.
+ grpc_core::RefCountedPtr<grpc_core::GrpcLbClientStats> client_stats;
+ // State for intercepting send_initial_metadata.
+ grpc_closure on_complete_for_send;
+ grpc_closure* original_on_complete_for_send;
+ bool send_initial_metadata_succeeded = false;
+ // State for intercepting recv_initial_metadata.
+ grpc_closure recv_initial_metadata_ready;
+ grpc_closure* original_recv_initial_metadata_ready;
+ bool recv_initial_metadata_succeeded = false;
+};
+
+} // namespace
+
+static void on_complete_for_send(void* arg, grpc_error* error) {
+ call_data* calld = static_cast<call_data*>(arg);
+ if (error == GRPC_ERROR_NONE) {
+ calld->send_initial_metadata_succeeded = true;
+ }
+ GRPC_CLOSURE_RUN(calld->original_on_complete_for_send, GRPC_ERROR_REF(error));
+}
+
+static void recv_initial_metadata_ready(void* arg, grpc_error* error) {
+ call_data* calld = static_cast<call_data*>(arg);
+ if (error == GRPC_ERROR_NONE) {
+ calld->recv_initial_metadata_succeeded = true;
+ }
+ GRPC_CLOSURE_RUN(calld->original_recv_initial_metadata_ready,
+ GRPC_ERROR_REF(error));
+}
+
+static grpc_error* init_call_elem(grpc_call_element* elem,
+ const grpc_call_element_args* args) {
+ GPR_ASSERT(args->context != nullptr);
+ new (elem->call_data) call_data();
+ return GRPC_ERROR_NONE;
+}
+
+static void destroy_call_elem(grpc_call_element* elem,
+ const grpc_call_final_info* final_info,
+ grpc_closure* ignored) {
+ call_data* calld = static_cast<call_data*>(elem->call_data);
+ if (calld->client_stats != nullptr) {
+ // Record call finished, optionally setting client_failed_to_send and
+ // received.
+ calld->client_stats->AddCallFinished(
+ !calld->send_initial_metadata_succeeded /* client_failed_to_send */,
+ calld->recv_initial_metadata_succeeded /* known_received */);
+ }
+ calld->~call_data();
+}
+
+static void start_transport_stream_op_batch(
+ grpc_call_element* elem, grpc_transport_stream_op_batch* batch) {
+ call_data* calld = static_cast<call_data*>(elem->call_data);
+ GPR_TIMER_SCOPE("clr_start_transport_stream_op_batch", 0);
+ // Handle send_initial_metadata.
+ if (batch->send_initial_metadata) {
+ // Grab client stats object from metadata.
+ grpc_linked_mdelem* client_stats_md =
+ batch->payload->send_initial_metadata.send_initial_metadata->list.head;
+ for (; client_stats_md != nullptr;
+ client_stats_md = client_stats_md->next) {
+ if (GRPC_SLICE_START_PTR(GRPC_MDKEY(client_stats_md->md)) ==
+ static_cast<const void*>(grpc_core::kGrpcLbClientStatsMetadataKey)) {
+ break;
+ }
+ }
+ if (client_stats_md != nullptr) {
+ grpc_core::GrpcLbClientStats* client_stats =
+ const_cast<grpc_core::GrpcLbClientStats*>(
+ reinterpret_cast<const grpc_core::GrpcLbClientStats*>(
+ GRPC_SLICE_START_PTR(GRPC_MDVALUE(client_stats_md->md))));
+ if (client_stats != nullptr) {
+ calld->client_stats.reset(client_stats);
+ // Intercept completion.
+ calld->original_on_complete_for_send = batch->on_complete;
+ GRPC_CLOSURE_INIT(&calld->on_complete_for_send, on_complete_for_send,
+ calld, grpc_schedule_on_exec_ctx);
+ batch->on_complete = &calld->on_complete_for_send;
+ }
+ // Remove metadata so it doesn't go out on the wire.
+ grpc_metadata_batch_remove(
+ batch->payload->send_initial_metadata.send_initial_metadata,
+ client_stats_md);
+ }
+ }
+ // Intercept completion of recv_initial_metadata.
+ if (batch->recv_initial_metadata) {
+ calld->original_recv_initial_metadata_ready =
+ batch->payload->recv_initial_metadata.recv_initial_metadata_ready;
+ GRPC_CLOSURE_INIT(&calld->recv_initial_metadata_ready,
+ recv_initial_metadata_ready, calld,
+ grpc_schedule_on_exec_ctx);
+ batch->payload->recv_initial_metadata.recv_initial_metadata_ready =
+ &calld->recv_initial_metadata_ready;
+ }
+ // Chain to next filter.
+ grpc_call_next_op(elem, batch);
+}
+
+const grpc_channel_filter grpc_client_load_reporting_filter = {
+ start_transport_stream_op_batch,
+ grpc_channel_next_op,
+ sizeof(call_data),
+ init_call_elem,
+ grpc_call_stack_ignore_set_pollset_or_pollset_set,
+ destroy_call_elem,
+ 0, // sizeof(channel_data)
+ init_channel_elem,
+ destroy_channel_elem,
+ grpc_channel_next_get_info,
+ "client_load_reporting"};
git://repos.xcallymotion.com / motion2.git / blobdiff