| /* |
| * |
| * Copyright 2016, 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 <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/sync.h> |
| #include <string.h> |
| |
| #include "src/core/ext/load_reporting/load_reporting.h" |
| #include "src/core/ext/load_reporting/load_reporting_filter.h" |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/profiling/timers.h" |
| #include "src/core/lib/transport/static_metadata.h" |
| |
| typedef struct call_data { const char *trailing_md_string; } call_data; |
| typedef struct channel_data { |
| gpr_mu mu; |
| grpc_load_reporting_config *lrc; |
| } channel_data; |
| |
| static void invoke_lr_fn_locked(grpc_load_reporting_config *lrc, |
| grpc_load_reporting_call_data *lr_call_data) { |
| GPR_TIMER_BEGIN("load_reporting_config_fn", 0); |
| grpc_load_reporting_config_call(lrc, lr_call_data); |
| GPR_TIMER_END("load_reporting_config_fn", 0); |
| } |
| |
| /* Constructor for call_data */ |
| static void init_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| grpc_call_element_args *args) { |
| call_data *calld = elem->call_data; |
| memset(calld, 0, sizeof(call_data)); |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| const grpc_call_stats *stats, void *ignored) { |
| channel_data *chand = elem->channel_data; |
| call_data *calld = elem->call_data; |
| |
| grpc_load_reporting_call_data lr_call_data = {stats, |
| calld->trailing_md_string}; |
| |
| gpr_mu_lock(&chand->mu); |
| invoke_lr_fn_locked(chand->lrc, &lr_call_data); |
| gpr_mu_unlock(&chand->mu); |
| } |
| |
| /* Constructor for channel_data */ |
| static void init_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem, |
| grpc_channel_element_args *args) { |
| GPR_ASSERT(!args->is_last); |
| |
| channel_data *chand = elem->channel_data; |
| memset(chand, 0, sizeof(channel_data)); |
| |
| gpr_mu_init(&chand->mu); |
| for (size_t i = 0; i < args->channel_args->num_args; i++) { |
| if (0 == strcmp(args->channel_args->args[i].key, |
| GRPC_ARG_ENABLE_LOAD_REPORTING)) { |
| grpc_load_reporting_config *arg_lrc = |
| args->channel_args->args[i].value.pointer.p; |
| chand->lrc = grpc_load_reporting_config_copy(arg_lrc); |
| GPR_ASSERT(chand->lrc != NULL); |
| break; |
| } |
| } |
| GPR_ASSERT(chand->lrc != NULL); /* arg actually found */ |
| |
| gpr_mu_lock(&chand->mu); |
| invoke_lr_fn_locked(chand->lrc, NULL); |
| gpr_mu_unlock(&chand->mu); |
| } |
| |
| /* Destructor for channel data */ |
| static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem) { |
| channel_data *chand = elem->channel_data; |
| gpr_mu_destroy(&chand->mu); |
| grpc_load_reporting_config_destroy(chand->lrc); |
| } |
| |
| static grpc_mdelem *lr_trailing_md_filter(void *user_data, grpc_mdelem *md) { |
| grpc_call_element *elem = user_data; |
| call_data *calld = elem->call_data; |
| |
| if (md->key == GRPC_MDSTR_LOAD_REPORTING) { |
| calld->trailing_md_string = gpr_strdup(grpc_mdstr_as_c_string(md->value)); |
| return NULL; |
| } |
| |
| return md; |
| } |
| |
| static void lr_start_transport_stream_op(grpc_exec_ctx *exec_ctx, |
| grpc_call_element *elem, |
| grpc_transport_stream_op *op) { |
| GPR_TIMER_BEGIN("lr_start_transport_stream_op", 0); |
| |
| if (op->send_trailing_metadata) { |
| grpc_metadata_batch_filter(op->send_trailing_metadata, |
| lr_trailing_md_filter, elem); |
| } |
| grpc_call_next_op(exec_ctx, elem, op); |
| |
| GPR_TIMER_END("lr_start_transport_stream_op", 0); |
| } |
| |
| const grpc_channel_filter grpc_load_reporting_filter = { |
| lr_start_transport_stream_op, |
| grpc_channel_next_op, |
| sizeof(call_data), |
| init_call_elem, |
| grpc_call_stack_ignore_set_pollset_or_pollset_set, |
| destroy_call_elem, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| grpc_call_next_get_peer, |
| "load_reporting"}; |