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/*
*
* 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 <grpc/support/atm.h>
#include <grpc/support/log.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;
// State for intercepting recv_initial_metadata.
grpc_closure recv_initial_metadata_ready;
grpc_closure* original_recv_initial_metadata_ready;
bool recv_initial_metadata_succeeded;
};
} // 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) {
call_data* calld = static_cast<call_data*>(elem->call_data);
// Get stats object from context and take a ref.
GPR_ASSERT(args->context != nullptr);
if (args->context[GRPC_GRPCLB_CLIENT_STATS].value != nullptr) {
calld->client_stats = static_cast<grpc_core::GrpcLbClientStats*>(
args->context[GRPC_GRPCLB_CLIENT_STATS].value)
->Ref();
// Record call started.
calld->client_stats->AddCallStarted();
}
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 */);
// All done, so unref the stats object.
// TODO(roth): Eliminate this once filter stack is converted to C++.
calld->client_stats.reset();
}
}
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);
if (calld->client_stats != nullptr) {
// Intercept send_initial_metadata.
if (batch->send_initial_metadata) {
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;
}
// Intercept 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"};
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