253 lines
8.3 KiB
C++
253 lines
8.3 KiB
C++
/*
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*
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* Copyright 2015 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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*/
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#include <grpcpp/channel.h>
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#include <cstring>
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#include <memory>
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#include <mutex>
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#include <grpc/grpc.h>
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#include <grpc/slice.h>
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#include <grpc/support/alloc.h>
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#include <grpc/support/log.h>
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#include <grpc/support/sync.h>
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#include <grpc/support/time.h>
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#include <grpcpp/client_context.h>
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#include <grpcpp/completion_queue.h>
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#include <grpcpp/impl/call.h>
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#include <grpcpp/impl/codegen/call_op_set.h>
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#include <grpcpp/impl/codegen/completion_queue_tag.h>
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#include <grpcpp/impl/grpc_library.h>
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#include <grpcpp/impl/rpc_method.h>
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#include <grpcpp/security/credentials.h>
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#include <grpcpp/support/channel_arguments.h>
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#include <grpcpp/support/config.h>
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#include <grpcpp/support/status.h>
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#include "src/core/lib/gpr/string.h"
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#include "src/core/lib/surface/completion_queue.h"
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void grpc::experimental::ChannelResetConnectionBackoff(
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::grpc::Channel* channel) {
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grpc_impl::experimental::ChannelResetConnectionBackoff(channel);
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}
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namespace grpc_impl {
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static ::grpc::internal::GrpcLibraryInitializer g_gli_initializer;
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Channel::Channel(const grpc::string& host, grpc_channel* channel,
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std::vector<std::unique_ptr<
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::grpc::experimental::ClientInterceptorFactoryInterface>>
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interceptor_creators)
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: host_(host), c_channel_(channel) {
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interceptor_creators_ = std::move(interceptor_creators);
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g_gli_initializer.summon();
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}
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Channel::~Channel() {
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grpc_channel_destroy(c_channel_);
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if (callback_cq_ != nullptr) {
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callback_cq_->Shutdown();
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}
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}
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namespace {
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inline grpc_slice SliceFromArray(const char* arr, size_t len) {
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return ::grpc::g_core_codegen_interface->grpc_slice_from_copied_buffer(arr,
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len);
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}
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grpc::string GetChannelInfoField(grpc_channel* channel,
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grpc_channel_info* channel_info,
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char*** channel_info_field) {
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char* value = nullptr;
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memset(channel_info, 0, sizeof(*channel_info));
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*channel_info_field = &value;
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grpc_channel_get_info(channel, channel_info);
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if (value == nullptr) return "";
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grpc::string result = value;
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gpr_free(value);
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return result;
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}
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} // namespace
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grpc::string Channel::GetLoadBalancingPolicyName() const {
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grpc_channel_info channel_info;
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return GetChannelInfoField(c_channel_, &channel_info,
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&channel_info.lb_policy_name);
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}
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grpc::string Channel::GetServiceConfigJSON() const {
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grpc_channel_info channel_info;
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return GetChannelInfoField(c_channel_, &channel_info,
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&channel_info.service_config_json);
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}
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namespace experimental {
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void ChannelResetConnectionBackoff(Channel* channel) {
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grpc_channel_reset_connect_backoff(channel->c_channel_);
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}
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} // namespace experimental
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::grpc::internal::Call Channel::CreateCallInternal(
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const ::grpc::internal::RpcMethod& method, ::grpc::ClientContext* context,
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::grpc::CompletionQueue* cq, size_t interceptor_pos) {
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const bool kRegistered = method.channel_tag() && context->authority().empty();
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grpc_call* c_call = nullptr;
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if (kRegistered) {
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c_call = grpc_channel_create_registered_call(
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c_channel_, context->propagate_from_call_,
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context->propagation_options_.c_bitmask(), cq->cq(),
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method.channel_tag(), context->raw_deadline(), nullptr);
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} else {
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const ::grpc::string* host_str = nullptr;
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if (!context->authority_.empty()) {
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host_str = &context->authority_;
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} else if (!host_.empty()) {
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host_str = &host_;
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}
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grpc_slice method_slice =
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SliceFromArray(method.name(), strlen(method.name()));
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grpc_slice host_slice;
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if (host_str != nullptr) {
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host_slice = ::grpc::SliceFromCopiedString(*host_str);
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}
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c_call = grpc_channel_create_call(
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c_channel_, context->propagate_from_call_,
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context->propagation_options_.c_bitmask(), cq->cq(), method_slice,
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host_str == nullptr ? nullptr : &host_slice, context->raw_deadline(),
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nullptr);
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grpc_slice_unref(method_slice);
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if (host_str != nullptr) {
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grpc_slice_unref(host_slice);
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}
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}
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grpc_census_call_set_context(c_call, context->census_context());
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// ClientRpcInfo should be set before call because set_call also checks
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// whether the call has been cancelled, and if the call was cancelled, we
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// should notify the interceptors too/
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auto* info =
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context->set_client_rpc_info(method.name(), method.method_type(), this,
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interceptor_creators_, interceptor_pos);
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context->set_call(c_call, shared_from_this());
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return ::grpc::internal::Call(c_call, this, cq, info);
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}
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::grpc::internal::Call Channel::CreateCall(
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const ::grpc::internal::RpcMethod& method, ::grpc::ClientContext* context,
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::grpc::CompletionQueue* cq) {
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return CreateCallInternal(method, context, cq, 0);
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}
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void Channel::PerformOpsOnCall(::grpc::internal::CallOpSetInterface* ops,
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::grpc::internal::Call* call) {
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ops->FillOps(
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call); // Make a copy of call. It's fine since Call just has pointers
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}
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void* Channel::RegisterMethod(const char* method) {
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return grpc_channel_register_call(
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c_channel_, method, host_.empty() ? nullptr : host_.c_str(), nullptr);
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}
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grpc_connectivity_state Channel::GetState(bool try_to_connect) {
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return grpc_channel_check_connectivity_state(c_channel_, try_to_connect);
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}
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namespace {
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class TagSaver final : public ::grpc::internal::CompletionQueueTag {
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public:
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explicit TagSaver(void* tag) : tag_(tag) {}
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~TagSaver() override {}
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bool FinalizeResult(void** tag, bool* status) override {
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*tag = tag_;
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delete this;
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return true;
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}
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private:
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void* tag_;
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};
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} // namespace
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void Channel::NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
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gpr_timespec deadline,
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::grpc::CompletionQueue* cq, void* tag) {
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TagSaver* tag_saver = new TagSaver(tag);
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grpc_channel_watch_connectivity_state(c_channel_, last_observed, deadline,
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cq->cq(), tag_saver);
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}
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bool Channel::WaitForStateChangeImpl(grpc_connectivity_state last_observed,
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gpr_timespec deadline) {
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::grpc::CompletionQueue cq;
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bool ok = false;
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void* tag = nullptr;
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NotifyOnStateChangeImpl(last_observed, deadline, &cq, nullptr);
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cq.Next(&tag, &ok);
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GPR_ASSERT(tag == nullptr);
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return ok;
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}
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namespace {
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class ShutdownCallback : public grpc_experimental_completion_queue_functor {
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public:
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ShutdownCallback() { functor_run = &ShutdownCallback::Run; }
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// TakeCQ takes ownership of the cq into the shutdown callback
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// so that the shutdown callback will be responsible for destroying it
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void TakeCQ(::grpc::CompletionQueue* cq) { cq_ = cq; }
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// The Run function will get invoked by the completion queue library
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// when the shutdown is actually complete
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static void Run(grpc_experimental_completion_queue_functor* cb, int) {
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auto* callback = static_cast<ShutdownCallback*>(cb);
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delete callback->cq_;
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delete callback;
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}
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private:
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::grpc::CompletionQueue* cq_ = nullptr;
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};
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} // namespace
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::grpc::CompletionQueue* Channel::CallbackCQ() {
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// TODO(vjpai): Consider using a single global CQ for the default CQ
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// if there is no explicit per-channel CQ registered
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grpc::internal::MutexLock l(&mu_);
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if (callback_cq_ == nullptr) {
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auto* shutdown_callback = new ShutdownCallback;
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callback_cq_ = new ::grpc::CompletionQueue(grpc_completion_queue_attributes{
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GRPC_CQ_CURRENT_VERSION, GRPC_CQ_CALLBACK, GRPC_CQ_DEFAULT_POLLING,
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shutdown_callback});
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// Transfer ownership of the new cq to its own shutdown callback
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shutdown_callback->TakeCQ(callback_cq_);
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}
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return callback_cq_;
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}
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} // namespace grpc_impl
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