| /* |
| * |
| * 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/ext/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/ext/census/census_interface.h" |
| #include "src/core/ext/census/census_rpc_stats.h" |
| #include "src/core/lib/channel/channel_stack.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, |
| grpc_error *error) { |
| grpc_call_element *elem = ptr; |
| call_data *calld = elem->call_data; |
| channel_data *chand = elem->channel_data; |
| if (error == GRPC_ERROR_NONE) { |
| extract_and_annotate_method_tag(calld->recv_initial_metadata, calld, chand); |
| } |
| calld->on_done_recv->cb(exec_ctx, calld->on_done_recv->cb_arg, error); |
| } |
| |
| 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, |
| const grpc_call_stats *stats, |
| void *ignored) { |
| 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, |
| const grpc_call_stats *stats, |
| void *ignored) { |
| 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_or_pollset_set, |
| 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_or_pollset_set, |
| server_destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| grpc_call_next_get_peer, |
| "census-server"}; |