| /* |
| * |
| * Copyright 2016 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include <string.h> |
| |
| #include <grpc/load_reporting.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/sync.h> |
| |
| #include "src/core/ext/filters/load_reporting/server_load_reporting_filter.h" |
| #include "src/core/ext/filters/load_reporting/server_load_reporting_plugin.h" |
| #include "src/core/lib/channel/channel_args.h" |
| #include "src/core/lib/profiling/timers.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/transport/static_metadata.h" |
| |
| typedef struct call_data { |
| intptr_t id; /**< an id unique to the call */ |
| bool have_trailing_md_string; |
| grpc_slice trailing_md_string; |
| bool have_initial_md_string; |
| grpc_slice initial_md_string; |
| bool have_service_method; |
| grpc_slice 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; |
| |
| static void on_initial_md_ready(grpc_exec_ctx* exec_ctx, void* user_data, |
| grpc_error* err) { |
| grpc_call_element* elem = (grpc_call_element*)user_data; |
| call_data* calld = (call_data*)elem->call_data; |
| |
| if (err == GRPC_ERROR_NONE) { |
| if (calld->recv_initial_metadata->idx.named.path != nullptr) { |
| calld->service_method = grpc_slice_ref_internal( |
| GRPC_MDVALUE(calld->recv_initial_metadata->idx.named.path->md)); |
| calld->have_service_method = true; |
| } else { |
| err = grpc_error_add_child( |
| err, GRPC_ERROR_CREATE_FROM_STATIC_STRING("Missing :path header")); |
| } |
| if (calld->recv_initial_metadata->idx.named.lb_token != nullptr) { |
| calld->initial_md_string = grpc_slice_ref_internal( |
| GRPC_MDVALUE(calld->recv_initial_metadata->idx.named.lb_token->md)); |
| calld->have_initial_md_string = true; |
| grpc_metadata_batch_remove( |
| exec_ctx, calld->recv_initial_metadata, |
| calld->recv_initial_metadata->idx.named.lb_token); |
| } |
| } 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, |
| const grpc_call_element_args* args) { |
| call_data* calld = (call_data*)elem->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, |
| grpc_closure* ignored) { |
| call_data* calld = (call_data*)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}; |
| */ |
| |
| if (calld->have_initial_md_string) { |
| grpc_slice_unref_internal(exec_ctx, calld->initial_md_string); |
| } |
| if (calld->have_trailing_md_string) { |
| grpc_slice_unref_internal(exec_ctx, calld->trailing_md_string); |
| } |
| if (calld->have_service_method) { |
| grpc_slice_unref_internal(exec_ctx, calld->service_method); |
| } |
| } |
| |
| /* 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 = (channel_data*)elem->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_filtered_mdelem lr_trailing_md_filter(grpc_exec_ctx* exec_ctx, |
| void* user_data, |
| grpc_mdelem md) { |
| grpc_call_element* elem = (grpc_call_element*)user_data; |
| call_data* calld = (call_data*)elem->call_data; |
| if (grpc_slice_eq(GRPC_MDKEY(md), GRPC_MDSTR_LB_COST_BIN)) { |
| calld->trailing_md_string = GRPC_MDVALUE(md); |
| return GRPC_FILTERED_REMOVE(); |
| } |
| return GRPC_FILTERED_MDELEM(md); |
| } |
| |
| static void lr_start_transport_stream_op_batch( |
| grpc_exec_ctx* exec_ctx, grpc_call_element* elem, |
| grpc_transport_stream_op_batch* op) { |
| GPR_TIMER_BEGIN("lr_start_transport_stream_op_batch", 0); |
| call_data* calld = (call_data*)elem->call_data; |
| |
| if (op->recv_initial_metadata) { |
| /* substitute our callback for the higher callback */ |
| calld->recv_initial_metadata = |
| op->payload->recv_initial_metadata.recv_initial_metadata; |
| calld->ops_recv_initial_metadata_ready = |
| op->payload->recv_initial_metadata.recv_initial_metadata_ready; |
| op->payload->recv_initial_metadata.recv_initial_metadata_ready = |
| &calld->on_initial_md_ready; |
| } else if (op->send_trailing_metadata) { |
| GRPC_LOG_IF_ERROR( |
| "grpc_metadata_batch_filter", |
| grpc_metadata_batch_filter( |
| exec_ctx, |
| op->payload->send_trailing_metadata.send_trailing_metadata, |
| lr_trailing_md_filter, elem, |
| "LR trailing metadata filtering error")); |
| } |
| grpc_call_next_op(exec_ctx, elem, op); |
| |
| GPR_TIMER_END("lr_start_transport_stream_op_batch", 0); |
| } |
| |
| const grpc_channel_filter grpc_server_load_reporting_filter = { |
| lr_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, |
| sizeof(channel_data), |
| init_channel_elem, |
| destroy_channel_elem, |
| grpc_channel_next_get_info, |
| "load_reporting"}; |