| /* |
| * |
| * 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 <limits.h> |
| #include <string.h> |
| |
| #include <grpc/load_reporting.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/sync.h> |
| |
| #include "src/core/ext/filters/load_reporting/load_reporting.h" |
| #include "src/core/ext/filters/load_reporting/load_reporting_filter.h" |
| #include "src/core/lib/channel/channel_stack_builder.h" |
| #include "src/core/lib/slice/slice_internal.h" |
| #include "src/core/lib/surface/call.h" |
| #include "src/core/lib/surface/channel_init.h" |
| |
| static void destroy_lr_cost_context(void *c) { |
| grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; |
| grpc_load_reporting_cost_context *cost_ctx = c; |
| for (size_t i = 0; i < cost_ctx->values_count; ++i) { |
| grpc_slice_unref_internal(&exec_ctx, cost_ctx->values[i]); |
| } |
| grpc_exec_ctx_finish(&exec_ctx); |
| gpr_free(cost_ctx->values); |
| gpr_free(cost_ctx); |
| } |
| |
| void grpc_call_set_load_reporting_cost_context( |
| grpc_call *call, grpc_load_reporting_cost_context *ctx) { |
| grpc_call_context_set(call, GRPC_CONTEXT_LR_COST, ctx, |
| destroy_lr_cost_context); |
| } |
| |
| static bool is_load_reporting_enabled(const grpc_channel_args *a) { |
| if (a == NULL) return false; |
| for (size_t i = 0; i < a->num_args; i++) { |
| if (0 == strcmp(a->args[i].key, GRPC_ARG_ENABLE_LOAD_REPORTING)) { |
| return a->args[i].type == GRPC_ARG_INTEGER && |
| a->args[i].value.integer != 0; |
| } |
| } |
| return false; |
| } |
| |
| static bool maybe_add_load_reporting_filter(grpc_exec_ctx *exec_ctx, |
| grpc_channel_stack_builder *builder, |
| void *arg) { |
| const grpc_channel_args *args = |
| grpc_channel_stack_builder_get_channel_arguments(builder); |
| if (is_load_reporting_enabled(args)) { |
| return grpc_channel_stack_builder_prepend_filter( |
| builder, (const grpc_channel_filter *)arg, NULL, NULL); |
| } |
| return true; |
| } |
| |
| grpc_arg grpc_load_reporting_enable_arg() { |
| grpc_arg arg; |
| arg.type = GRPC_ARG_INTEGER; |
| arg.key = GRPC_ARG_ENABLE_LOAD_REPORTING; |
| arg.value.integer = 1; |
| return arg; |
| } |
| |
| /* Plugin registration */ |
| |
| void grpc_load_reporting_plugin_init(void) { |
| grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX, |
| maybe_add_load_reporting_filter, |
| (void *)&grpc_load_reporting_filter); |
| } |
| |
| void grpc_load_reporting_plugin_shutdown() {} |