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/*
*
* Copyright 2017, 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 "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_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_channel_element_args *args) {
return GRPC_ERROR_NONE;
}
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem) {}
typedef struct {
// Stats object to update.
grpc_grpclb_client_stats *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;
} call_data;
static void on_complete_for_send(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
call_data *calld = arg;
if (error == GRPC_ERROR_NONE) {
calld->send_initial_metadata_succeeded = true;
}
grpc_closure_run(exec_ctx, calld->original_on_complete_for_send,
GRPC_ERROR_REF(error));
}
static void recv_initial_metadata_ready(grpc_exec_ctx *exec_ctx, void *arg,
grpc_error *error) {
call_data *calld = arg;
if (error == GRPC_ERROR_NONE) {
calld->recv_initial_metadata_succeeded = true;
}
grpc_closure_run(exec_ctx, calld->original_recv_initial_metadata_ready,
GRPC_ERROR_REF(error));
}
static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
const grpc_call_element_args *args) {
call_data *calld = elem->call_data;
// Get stats object from context and take a ref.
GPR_ASSERT(args->context != NULL);
GPR_ASSERT(args->context[GRPC_GRPCLB_CLIENT_STATS].value != NULL);
calld->client_stats = grpc_grpclb_client_stats_ref(
args->context[GRPC_GRPCLB_CLIENT_STATS].value);
// Record call started.
grpc_grpclb_client_stats_add_call_started(calld->client_stats);
return GRPC_ERROR_NONE;
}
static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
const grpc_call_final_info *final_info,
grpc_closure *ignored) {
call_data *calld = elem->call_data;
// Record call finished, optionally setting client_failed_to_send and
// received.
grpc_grpclb_client_stats_add_call_finished(
false /* drop_for_rate_limiting */, false /* drop_for_load_balancing */,
!calld->send_initial_metadata_succeeded /* client_failed_to_send */,
calld->recv_initial_metadata_succeeded /* known_received */,
calld->client_stats);
// All done, so unref the stats object.
grpc_grpclb_client_stats_unref(calld->client_stats);
}
static void start_transport_stream_op_batch(
grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
grpc_transport_stream_op_batch *batch) {
call_data *calld = elem->call_data;
GPR_TIMER_BEGIN("clr_start_transport_stream_op_batch", 0);
// 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(exec_ctx, elem, batch);
GPR_TIMER_END("clr_start_transport_stream_op_batch", 0);
}
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_call_next_get_peer,
grpc_channel_next_get_info,
"client_load_reporting"};
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