| /* |
| * |
| * 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/alloc.h> |
| #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 { |
| intptr_t id; /**< an id unique to the call */ |
| char *trailing_md_string; |
| char *initial_md_string; |
| const char *service_method; |
| |
| /* stores the recv_initial_metadata op's ready closure, which we wrap with our |
| * own (on_initial_md_ready) in order to capture the incoming initial metadata |
| * */ |
| grpc_closure *ops_recv_initial_metadata_ready; |
| |
| /* to get notified of the availability of the incoming initial metadata. */ |
| grpc_closure on_initial_md_ready; |
| grpc_metadata_batch *recv_initial_metadata; |
| } call_data; |
| |
| typedef struct channel_data { |
| intptr_t id; /**< an id unique to the channel */ |
| } channel_data; |
| |
| typedef struct { |
| grpc_call_element *elem; |
| grpc_exec_ctx *exec_ctx; |
| } recv_md_filter_args; |
| |
| static grpc_mdelem *recv_md_filter(void *user_data, grpc_mdelem *md) { |
| recv_md_filter_args *a = user_data; |
| grpc_call_element *elem = a->elem; |
| call_data *calld = elem->call_data; |
| |
| if (md->key == GRPC_MDSTR_PATH) { |
| calld->service_method = grpc_mdstr_as_c_string(md->value); |
| } else if (md->key == GRPC_MDSTR_LB_TOKEN) { |
| calld->initial_md_string = gpr_strdup(grpc_mdstr_as_c_string(md->value)); |
| return NULL; |
| } |
| |
| return md; |
| } |
| |
| static void on_initial_md_ready(grpc_exec_ctx *exec_ctx, void *user_data, |
| grpc_error *err) { |
| grpc_call_element *elem = user_data; |
| call_data *calld = elem->call_data; |
| |
| if (err == GRPC_ERROR_NONE) { |
| recv_md_filter_args a; |
| a.elem = elem; |
| a.exec_ctx = exec_ctx; |
| grpc_metadata_batch_filter(calld->recv_initial_metadata, recv_md_filter, |
| &a); |
| if (calld->service_method == NULL) { |
| err = |
| grpc_error_add_child(err, GRPC_ERROR_CREATE("Missing :path header")); |
| } |
| } else { |
| GRPC_ERROR_REF(err); |
| } |
| calld->ops_recv_initial_metadata_ready->cb( |
| exec_ctx, calld->ops_recv_initial_metadata_ready->cb_arg, err); |
| GRPC_ERROR_UNREF(err); |
| } |
| |
| /* Constructor for call_data */ |
| static grpc_error *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)); |
| |
| calld->id = (intptr_t)args->call_stack; |
| grpc_closure_init(&calld->on_initial_md_ready, on_initial_md_ready, elem, |
| grpc_schedule_on_exec_ctx); |
| |
| /* TODO(dgq): do something with the data |
| channel_data *chand = elem->channel_data; |
| grpc_load_reporting_call_data lr_call_data = {GRPC_LR_POINT_CALL_CREATION, |
| (intptr_t)chand->id, |
| (intptr_t)calld->id, |
| NULL, |
| NULL, |
| NULL, |
| NULL}; |
| */ |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for call_data */ |
| static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem, |
| const grpc_call_final_info *final_info, |
| void *ignored) { |
| call_data *calld = elem->call_data; |
| |
| /* TODO(dgq): do something with the data |
| channel_data *chand = elem->channel_data; |
| grpc_load_reporting_call_data lr_call_data = {GRPC_LR_POINT_CALL_DESTRUCTION, |
| (intptr_t)chand->id, |
| (intptr_t)calld->id, |
| final_info, |
| calld->initial_md_string, |
| calld->trailing_md_string, |
| calld->service_method}; |
| */ |
| |
| gpr_free(calld->initial_md_string); |
| gpr_free(calld->trailing_md_string); |
| } |
| |
| /* Constructor for channel_data */ |
| static grpc_error *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)); |
| |
| chand->id = (intptr_t)args->channel_stack; |
| |
| /* TODO(dgq): do something with the data |
| grpc_load_reporting_call_data lr_call_data = {GRPC_LR_POINT_CHANNEL_CREATION, |
| (intptr_t)chand, |
| 0, |
| NULL, |
| NULL, |
| NULL, |
| NULL}; |
| */ |
| |
| return GRPC_ERROR_NONE; |
| } |
| |
| /* Destructor for channel data */ |
| static void destroy_channel_elem(grpc_exec_ctx *exec_ctx, |
| grpc_channel_element *elem) { |
| /* TODO(dgq): do something with the data |
| channel_data *chand = elem->channel_data; |
| grpc_load_reporting_call_data lr_call_data = { |
| GRPC_LR_POINT_CHANNEL_DESTRUCTION, |
| (intptr_t)chand->id, |
| 0, |
| NULL, |
| NULL, |
| NULL, |
| NULL}; |
| */ |
| } |
| |
| 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_LB_COST_BIN) { |
| 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); |
| call_data *calld = elem->call_data; |
| |
| if (op->recv_initial_metadata) { |
| calld->recv_initial_metadata = op->recv_initial_metadata; |
| /* substitute our callback for the higher callback */ |
| calld->ops_recv_initial_metadata_ready = op->recv_initial_metadata_ready; |
| op->recv_initial_metadata_ready = &calld->on_initial_md_ready; |
| } else 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, |
| grpc_channel_next_get_info, |
| "load_reporting"}; |