src/cpp/client/client_context.cc

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 *
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#include <grpc++/client_context.h>

#include <grpc/grpc.h>
#include <grpc++/credentials.h>
#include <grpc++/time.h>
#include "src/cpp/common/create_auth_context.h"

namespace grpc {

ClientContext::ClientContext()
    : initial_metadata_received_(false),
      call_(nullptr),
      cq_(nullptr),
      deadline_(gpr_inf_future) {}

ClientContext::~ClientContext() {
  if (call_) {
    grpc_call_destroy(call_);
  }
  if (cq_) {
    // Drain cq_.
    grpc_completion_queue_shutdown(cq_);
    while (grpc_completion_queue_next(cq_, gpr_inf_future).type !=
           GRPC_QUEUE_SHUTDOWN)
      ;
    grpc_completion_queue_destroy(cq_);
  }
}

void ClientContext::AddMetadata(const grpc::string& meta_key,
                                const grpc::string& meta_value) {
  send_initial_metadata_.insert(std::make_pair(meta_key, meta_value));
}

void ClientContext::set_call(grpc_call* call,
                             const std::shared_ptr<ChannelInterface>& channel) {
  GPR_ASSERT(call_ == nullptr);
  call_ = call;
  channel_ = channel;
  if (creds_ && !creds_->ApplyToCall(call_)) {
    grpc_call_cancel_with_status(call, GRPC_STATUS_CANCELLED,
                                 "Failed to set credentials to rpc.");
  }
}

std::shared_ptr<const AuthContext> ClientContext::auth_context() const {
  if (auth_context_.get() == nullptr) {
    auth_context_ = CreateAuthContext(call_);
  }
  return auth_context_;
}

void ClientContext::TryCancel() {
  if (call_) {
    grpc_call_cancel(call_);
  }
}

}  // namespace grpc