intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 252 insertions, 0 deletions

diff --git a/contrib/libs/grpc/src/cpp/client/channel_cc.cc b/contrib/libs/grpc/src/cpp/client/channel_cc.cc
new file mode 100644
index 00000000000..ac95c29efcd
--- /dev/null
+++ b/contrib/libs/grpc/src/cpp/client/channel_cc.cc
@@ -0,0 +1,252 @@
+/*
+ *
+ * Copyright 2015 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 <grpcpp/channel.h>
+
+#include <cstring>
+#include <memory>
+
+#include <grpc/grpc.h>
+#include <grpc/slice.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/time.h>
+#include <grpcpp/client_context.h>
+#include <grpcpp/completion_queue.h>
+#include <grpcpp/impl/call.h>
+#include <grpcpp/impl/codegen/call_op_set.h>
+#include <grpcpp/impl/codegen/completion_queue_tag.h>
+#include <grpcpp/impl/grpc_library.h>
+#include <grpcpp/impl/rpc_method.h>
+#include <grpcpp/security/credentials.h>
+#include <grpcpp/support/channel_arguments.h>
+#include <grpcpp/support/config.h>
+#include <grpcpp/support/status.h>
+#include "src/core/lib/gpr/string.h"
+#include "src/core/lib/surface/completion_queue.h"
+
+namespace grpc {
+
+static ::grpc::internal::GrpcLibraryInitializer g_gli_initializer;
+Channel::Channel(const TString& host, grpc_channel* channel,
+                 std::vector<std::unique_ptr<
+                     ::grpc::experimental::ClientInterceptorFactoryInterface>>
+                     interceptor_creators)
+    : host_(host), c_channel_(channel) {
+  interceptor_creators_ = std::move(interceptor_creators);
+  g_gli_initializer.summon();
+}
+
+Channel::~Channel() {
+  grpc_channel_destroy(c_channel_);
+  if (callback_cq_ != nullptr) {
+    callback_cq_->Shutdown();
+  }
+}
+
+namespace {
+
+inline grpc_slice SliceFromArray(const char* arr, size_t len) {
+  return g_core_codegen_interface->grpc_slice_from_copied_buffer(arr, len);
+}
+
+TString GetChannelInfoField(grpc_channel* channel,
+                                grpc_channel_info* channel_info,
+                                char*** channel_info_field) {
+  char* value = nullptr;
+  memset(channel_info, 0, sizeof(*channel_info));
+  *channel_info_field = &value;
+  grpc_channel_get_info(channel, channel_info);
+  if (value == nullptr) return "";
+  TString result = value;
+  gpr_free(value);
+  return result;
+}
+
+}  // namespace
+
+TString Channel::GetLoadBalancingPolicyName() const {
+  grpc_channel_info channel_info;
+  return GetChannelInfoField(c_channel_, &channel_info,
+                             &channel_info.lb_policy_name);
+}
+
+TString Channel::GetServiceConfigJSON() const {
+  grpc_channel_info channel_info;
+  return GetChannelInfoField(c_channel_, &channel_info,
+                             &channel_info.service_config_json);
+}
+
+namespace experimental {
+
+void ChannelResetConnectionBackoff(Channel* channel) {
+  grpc_channel_reset_connect_backoff(channel->c_channel_);
+}
+
+}  // namespace experimental
+
+::grpc::internal::Call Channel::CreateCallInternal(
+    const ::grpc::internal::RpcMethod& method, ::grpc::ClientContext* context,
+    ::grpc::CompletionQueue* cq, size_t interceptor_pos) {
+  const bool kRegistered = method.channel_tag() && context->authority().empty();
+  grpc_call* c_call = nullptr;
+  if (kRegistered) {
+    c_call = grpc_channel_create_registered_call(
+        c_channel_, context->propagate_from_call_,
+        context->propagation_options_.c_bitmask(), cq->cq(),
+        method.channel_tag(), context->raw_deadline(), nullptr);
+  } else {
+    const ::TString* host_str = nullptr;
+    if (!context->authority_.empty()) {
+      host_str = &context->authority_;
+    } else if (!host_.empty()) {
+      host_str = &host_;
+    }
+    grpc_slice method_slice =
+        SliceFromArray(method.name(), strlen(method.name()));
+    grpc_slice host_slice;
+    if (host_str != nullptr) {
+      host_slice = ::grpc::SliceFromCopiedString(*host_str);
+    }
+    c_call = grpc_channel_create_call(
+        c_channel_, context->propagate_from_call_,
+        context->propagation_options_.c_bitmask(), cq->cq(), method_slice,
+        host_str == nullptr ? nullptr : &host_slice, context->raw_deadline(),
+        nullptr);
+    grpc_slice_unref(method_slice);
+    if (host_str != nullptr) {
+      grpc_slice_unref(host_slice);
+    }
+  }
+  grpc_census_call_set_context(c_call, context->census_context());
+
+  // ClientRpcInfo should be set before call because set_call also checks
+  // whether the call has been cancelled, and if the call was cancelled, we
+  // should notify the interceptors too.
+  auto* info =
+      context->set_client_rpc_info(method.name(), method.method_type(), this,
+                                   interceptor_creators_, interceptor_pos);
+  context->set_call(c_call, shared_from_this());
+
+  return ::grpc::internal::Call(c_call, this, cq, info);
+}
+
+::grpc::internal::Call Channel::CreateCall(
+    const ::grpc::internal::RpcMethod& method, ::grpc::ClientContext* context,
+    CompletionQueue* cq) {
+  return CreateCallInternal(method, context, cq, 0);
+}
+
+void Channel::PerformOpsOnCall(::grpc::internal::CallOpSetInterface* ops,
+                               ::grpc::internal::Call* call) {
+  ops->FillOps(
+      call);  // Make a copy of call. It's fine since Call just has pointers
+}
+
+void* Channel::RegisterMethod(const char* method) {
+  return grpc_channel_register_call(
+      c_channel_, method, host_.empty() ? nullptr : host_.c_str(), nullptr);
+}
+
+grpc_connectivity_state Channel::GetState(bool try_to_connect) {
+  return grpc_channel_check_connectivity_state(c_channel_, try_to_connect);
+}
+
+namespace {
+
+class TagSaver final : public ::grpc::internal::CompletionQueueTag {
+ public:
+  explicit TagSaver(void* tag) : tag_(tag) {}
+  ~TagSaver() override {}
+  bool FinalizeResult(void** tag, bool* /*status*/) override {
+    *tag = tag_;
+    delete this;
+    return true;
+  }
+
+ private:
+  void* tag_;
+};
+
+}  // namespace
+
+void Channel::NotifyOnStateChangeImpl(grpc_connectivity_state last_observed,
+                                      gpr_timespec deadline,
+                                      ::grpc::CompletionQueue* cq, void* tag) {
+  TagSaver* tag_saver = new TagSaver(tag);
+  grpc_channel_watch_connectivity_state(c_channel_, last_observed, deadline,
+                                        cq->cq(), tag_saver);
+}
+
+bool Channel::WaitForStateChangeImpl(grpc_connectivity_state last_observed,
+                                     gpr_timespec deadline) {
+  ::grpc::CompletionQueue cq;
+  bool ok = false;
+  void* tag = nullptr;
+  NotifyOnStateChangeImpl(last_observed, deadline, &cq, nullptr);
+  cq.Next(&tag, &ok);
+  GPR_ASSERT(tag == nullptr);
+  return ok;
+}
+
+namespace {
+class ShutdownCallback : public grpc_experimental_completion_queue_functor {
+ public:
+  ShutdownCallback() {
+    functor_run = &ShutdownCallback::Run;
+    // Set inlineable to true since this callback is trivial and thus does not
+    // need to be run from the executor (triggering a thread hop). This should
+    // only be used by internal callbacks like this and not by user application
+    // code.
+    inlineable = true;
+  }
+  // TakeCQ takes ownership of the cq into the shutdown callback
+  // so that the shutdown callback will be responsible for destroying it
+  void TakeCQ(::grpc::CompletionQueue* cq) { cq_ = cq; }
+
+  // The Run function will get invoked by the completion queue library
+  // when the shutdown is actually complete
+  static void Run(grpc_experimental_completion_queue_functor* cb, int) {
+    auto* callback = static_cast<ShutdownCallback*>(cb);
+    delete callback->cq_;
+    delete callback;
+  }
+
+ private:
+  ::grpc::CompletionQueue* cq_ = nullptr;
+};
+}  // namespace
+
+::grpc::CompletionQueue* Channel::CallbackCQ() {
+  // TODO(vjpai): Consider using a single global CQ for the default CQ
+  // if there is no explicit per-channel CQ registered
+  grpc::internal::MutexLock l(&mu_);
+  if (callback_cq_ == nullptr) {
+    auto* shutdown_callback = new ShutdownCallback;
+    callback_cq_ = new ::grpc::CompletionQueue(grpc_completion_queue_attributes{
+        GRPC_CQ_CURRENT_VERSION, GRPC_CQ_CALLBACK, GRPC_CQ_DEFAULT_POLLING,
+        shutdown_callback});
+
+    // Transfer ownership of the new cq to its own shutdown callback
+    shutdown_callback->TakeCQ(callback_cq_);
+  }
+  return callback_cq_;
+}
+
+}  // namespace grpc