grpc/src/cpp/client/client_context.cc

/*
 *
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 * in the documentation and/or other materials provided with the
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#include <grpc++/client_context.h>

#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>
#include <grpc++/credentials.h>
#include <grpc++/server_context.h>
#include <grpc++/time.h>

#include "src/core/channel/compress_filter.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(GPR_CLOCK_REALTIME)),
      propagate_from_call_(nullptr) {}

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(GPR_CLOCK_REALTIME))
               .type != GRPC_QUEUE_SHUTDOWN)
      ;
    grpc_completion_queue_destroy(cq_);
  }
}

std::unique_ptr<ClientContext> ClientContext::FromServerContext(
    const ServerContext& context, PropagationOptions options) {
  std::unique_ptr<ClientContext> ctx(new ClientContext);
  ctx->propagate_from_call_ = context.call_;
  ctx->propagation_options_ = options;
  return ctx;
}

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.");
  }
}

void ClientContext::set_compression_algorithm(
    grpc_compression_algorithm algorithm) {
  char* algorithm_name = NULL;
  if (!grpc_compression_algorithm_name(algorithm, &algorithm_name)) {
    gpr_log(GPR_ERROR, "Name for compression algorithm '%d' unknown.",
            algorithm);
    abort();
  }
  GPR_ASSERT(algorithm_name != NULL);
  AddMetadata(GRPC_COMPRESS_REQUEST_ALGORITHM_KEY, algorithm_name);
}

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_);
  }
}

grpc::string ClientContext::peer() const {
  grpc::string peer;
  if (call_) {
    char* c_peer = grpc_call_get_peer(call_);
    peer = c_peer;
    gpr_free(c_peer);
  }
  return peer;
}

}  // namespace grpc