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/*
*
* 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
* 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/lib/census/grpc_filter.h"
#include <stdio.h>
#include <string.h>
#include <grpc/census.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>
#include <grpc/support/time.h>
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/statistics/census_interface.h"
#include "src/core/lib/statistics/census_rpc_stats.h"
#include "src/core/lib/transport/static_metadata.h"
typedef struct call_data {
census_op_id op_id;
census_context *ctxt;
gpr_timespec start_ts;
int error;
/* recv callback */
grpc_metadata_batch *recv_initial_metadata;
grpc_closure *on_done_recv;
grpc_closure finish_recv;
} call_data;
typedef struct channel_data { uint8_t unused; } channel_data;
static void extract_and_annotate_method_tag(grpc_metadata_batch *md,
call_data *calld,
channel_data *chand) {
grpc_linked_mdelem *m;
for (m = md->list.head; m != NULL; m = m->next) {
if (m->md->key == GRPC_MDSTR_PATH) {
gpr_log(GPR_DEBUG, "%s",
(const char *)GPR_SLICE_START_PTR(m->md->value->slice));
/* Add method tag here */
}
}
}
static void client_mutate_op(grpc_call_element *elem,
grpc_transport_stream_op *op) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
if (op->send_initial_metadata) {
extract_and_annotate_method_tag(op->send_initial_metadata, calld, chand);
}
}
static void client_start_transport_op(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_transport_stream_op *op) {
client_mutate_op(elem, op);
grpc_call_next_op(exec_ctx, elem, op);
}
static void server_on_done_recv(grpc_exec_ctx *exec_ctx, void *ptr,
bool success) {
grpc_call_element *elem = ptr;
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
if (success) {
extract_and_annotate_method_tag(calld->recv_initial_metadata, calld, chand);
}
calld->on_done_recv->cb(exec_ctx, calld->on_done_recv->cb_arg, success);
}
static void server_mutate_op(grpc_call_element *elem,
grpc_transport_stream_op *op) {
call_data *calld = elem->call_data;
if (op->recv_initial_metadata) {
/* substitute our callback for the op callback */
calld->recv_initial_metadata = op->recv_initial_metadata;
calld->on_done_recv = op->recv_initial_metadata_ready;
op->recv_initial_metadata_ready = &calld->finish_recv;
}
}
static void server_start_transport_op(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_transport_stream_op *op) {
/* TODO(ctiller): this code fails. I don't know why. I expect it's
incomplete, and someone should look at it soon.
call_data *calld = elem->call_data;
GPR_ASSERT((calld->op_id.upper != 0) || (calld->op_id.lower != 0)); */
server_mutate_op(elem, op);
grpc_call_next_op(exec_ctx, elem, op);
}
static void client_init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_call_element_args *args) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
memset(d, 0, sizeof(*d));
d->start_ts = gpr_now(GPR_CLOCK_REALTIME);
}
static void client_destroy_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
/* TODO(hongyu): record rpc client stats and census_rpc_end_op here */
}
static void server_init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_call_element_args *args) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
memset(d, 0, sizeof(*d));
d->start_ts = gpr_now(GPR_CLOCK_REALTIME);
/* TODO(hongyu): call census_tracing_start_op here. */
grpc_closure_init(&d->finish_recv, server_on_done_recv, elem);
}
static void server_destroy_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
/* TODO(hongyu): record rpc server stats and census_tracing_end_op here */
}
static void init_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_channel_element_args *args) {
channel_data *chand = elem->channel_data;
GPR_ASSERT(chand != NULL);
}
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem) {
channel_data *chand = elem->channel_data;
GPR_ASSERT(chand != NULL);
}
const grpc_channel_filter grpc_client_census_filter = {
client_start_transport_op,
grpc_channel_next_op,
sizeof(call_data),
client_init_call_elem,
grpc_call_stack_ignore_set_pollset,
client_destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
"census-client"};
const grpc_channel_filter grpc_server_census_filter = {
server_start_transport_op,
grpc_channel_next_op,
sizeof(call_data),
server_init_call_elem,
grpc_call_stack_ignore_set_pollset,
server_destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
"census-server"};
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