mirror of https://github.com/grpc/grpc.git
Vijay Pai
4 years ago
committed by
GitHub
parent
92f7ece27d
commit
c7f2956b67
24 changed files with 93 additions and 622 deletions
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//
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// Copyright 2020 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// This filter reads GRPC_ARG_SERVICE_CONFIG and populates ServiceConfigCallData
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// in the call context per call for direct channels.
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#include <grpc/support/port_platform.h> |
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#include "src/core/ext/filters/client_channel/service_config_call_data.h" |
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#include "src/core/lib/channel/channel_args.h" |
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#include "src/core/lib/channel/channel_stack.h" |
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#include "src/core/lib/channel/channel_stack_builder.h" |
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#include "src/core/lib/surface/channel_init.h" |
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namespace grpc_core { |
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namespace { |
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class ServiceConfigChannelArgChannelData { |
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public: |
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explicit ServiceConfigChannelArgChannelData( |
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const grpc_channel_element_args* args) { |
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const char* service_config_str = grpc_channel_args_find_string( |
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args->channel_args, GRPC_ARG_SERVICE_CONFIG); |
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if (service_config_str != nullptr) { |
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grpc_error* service_config_error = GRPC_ERROR_NONE; |
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auto service_config = |
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ServiceConfig::Create(service_config_str, &service_config_error); |
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if (service_config_error == GRPC_ERROR_NONE) { |
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service_config_ = std::move(service_config); |
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} else { |
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gpr_log(GPR_ERROR, "%s", grpc_error_string(service_config_error)); |
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} |
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GRPC_ERROR_UNREF(service_config_error); |
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} |
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} |
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RefCountedPtr<ServiceConfig> service_config() const { |
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return service_config_; |
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} |
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private: |
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RefCountedPtr<ServiceConfig> service_config_; |
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}; |
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class ServiceConfigChannelArgCallData { |
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public: |
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ServiceConfigChannelArgCallData(grpc_call_element* elem, |
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const grpc_call_element_args* args) { |
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ServiceConfigChannelArgChannelData* chand = |
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static_cast<ServiceConfigChannelArgChannelData*>(elem->channel_data); |
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RefCountedPtr<ServiceConfig> service_config = chand->service_config(); |
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if (service_config != nullptr) { |
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GPR_DEBUG_ASSERT(args->context != nullptr); |
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const auto* method_params_vector = |
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service_config->GetMethodParsedConfigVector(args->path); |
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args->arena->New<ServiceConfigCallData>( |
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std::move(service_config), method_params_vector, args->context); |
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} |
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} |
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}; |
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grpc_error* ServiceConfigChannelArgInitCallElem( |
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grpc_call_element* elem, const grpc_call_element_args* args) { |
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ServiceConfigChannelArgCallData* calld = |
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static_cast<ServiceConfigChannelArgCallData*>(elem->call_data); |
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new (calld) ServiceConfigChannelArgCallData(elem, args); |
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return GRPC_ERROR_NONE; |
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} |
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void ServiceConfigChannelArgDestroyCallElem( |
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grpc_call_element* elem, const grpc_call_final_info* /* final_info */, |
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grpc_closure* /* then_schedule_closure */) { |
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ServiceConfigChannelArgCallData* calld = |
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static_cast<ServiceConfigChannelArgCallData*>(elem->call_data); |
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calld->~ServiceConfigChannelArgCallData(); |
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} |
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grpc_error* ServiceConfigChannelArgInitChannelElem( |
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grpc_channel_element* elem, grpc_channel_element_args* args) { |
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ServiceConfigChannelArgChannelData* chand = |
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static_cast<ServiceConfigChannelArgChannelData*>(elem->channel_data); |
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new (chand) ServiceConfigChannelArgChannelData(args); |
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return GRPC_ERROR_NONE; |
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} |
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void ServiceConfigChannelArgDestroyChannelElem(grpc_channel_element* elem) { |
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ServiceConfigChannelArgChannelData* chand = |
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static_cast<ServiceConfigChannelArgChannelData*>(elem->channel_data); |
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chand->~ServiceConfigChannelArgChannelData(); |
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} |
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const grpc_channel_filter ServiceConfigChannelArgFilter = { |
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grpc_call_next_op, |
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grpc_channel_next_op, |
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sizeof(ServiceConfigChannelArgCallData), |
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ServiceConfigChannelArgInitCallElem, |
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grpc_call_stack_ignore_set_pollset_or_pollset_set, |
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ServiceConfigChannelArgDestroyCallElem, |
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sizeof(ServiceConfigChannelArgChannelData), |
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ServiceConfigChannelArgInitChannelElem, |
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ServiceConfigChannelArgDestroyChannelElem, |
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grpc_channel_next_get_info, |
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"service_config_channel_arg"}; |
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bool maybe_add_service_config_channel_arg_filter( |
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grpc_channel_stack_builder* builder, void* /* arg */) { |
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const grpc_channel_args* channel_args = |
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grpc_channel_stack_builder_get_channel_arguments(builder); |
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if (grpc_channel_args_want_minimal_stack(channel_args) || |
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grpc_channel_args_find_string(channel_args, GRPC_ARG_SERVICE_CONFIG) == |
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nullptr) { |
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return true; |
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} |
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return grpc_channel_stack_builder_prepend_filter( |
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builder, &ServiceConfigChannelArgFilter, nullptr, nullptr); |
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} |
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} // namespace
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} // namespace grpc_core
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void grpc_service_config_channel_arg_filter_init(void) { |
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grpc_channel_init_register_stage( |
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GRPC_CLIENT_DIRECT_CHANNEL, GRPC_CHANNEL_INIT_BUILTIN_PRIORITY, |
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grpc_core::maybe_add_service_config_channel_arg_filter, nullptr); |
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} |
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void grpc_service_config_channel_arg_filter_shutdown(void) {} |
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