test/cpp/util/cli_call.cc

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#include "test/cpp/util/cli_call.h"

#include <iostream>

#include <grpc++/channel.h>
#include <grpc++/client_context.h>
#include <grpc++/support/byte_buffer.h>
#include <grpc/grpc.h>
#include <grpc/slice.h>
#include <grpc/support/log.h>

namespace grpc {
namespace testing {
namespace {
void* tag(int i) { return (void*)(intptr_t)i; }
}  // namespace

enum CliCall::CallStatus : intptr_t { CREATE, PROCESS, FINISH };

Status CliCall::Call(std::shared_ptr<grpc::Channel> channel,
                     const grpc::string& method, const grpc::string& request,
                     grpc::string* response,
                     const OutgoingMetadataContainer& metadata,
                     IncomingMetadataContainer* server_initial_metadata,
                     IncomingMetadataContainer* server_trailing_metadata) {
  CliCall call(channel, method, metadata);
  call.Write(request);
  call.WritesDone();
  call.Read(response, server_initial_metadata);
  return call.Finish(server_trailing_metadata);
}

CliCall::CliCall(std::shared_ptr<grpc::Channel> channel,
                 const grpc::string& method,
                 const OutgoingMetadataContainer& metadata)
    : stub_(new grpc::GenericStub(channel)) {
  if (!metadata.empty()) {
    for (OutgoingMetadataContainer::const_iterator iter = metadata.begin();
         iter != metadata.end(); ++iter) {
      ctx_.AddMetadata(iter->first, iter->second);
    }
  }
  call_ = stub_->Call(&ctx_, method, &cq_, tag(1));
  void* got_tag;
  bool ok;
  cq_.Next(&got_tag, &ok);
  GPR_ASSERT(ok);
}

void CliCall::Write(const grpc::string& request) {
  void* got_tag;
  bool ok;

  grpc_slice s = grpc_slice_from_copied_string(request.c_str());
  grpc::Slice req_slice(s, grpc::Slice::STEAL_REF);
  grpc::ByteBuffer send_buffer(&req_slice, 1);
  call_->Write(send_buffer, tag(2));
  cq_.Next(&got_tag, &ok);
  GPR_ASSERT(ok);
}

void CliCall::Read(grpc::string* response,
                   IncomingMetadataContainer* server_initial_metadata) {
  void* got_tag;
  bool ok;

  grpc::ByteBuffer recv_buffer;
  call_->Read(&recv_buffer, tag(4));
  cq_.Next(&got_tag, &ok);
  if (!ok) {
    fprintf(stderr, "Failed to read response.");
  } else {
    std::vector<grpc::Slice> slices;
    (void)recv_buffer.Dump(&slices);

    response->clear();
    for (size_t i = 0; i < slices.size(); i++) {
      response->append(reinterpret_cast<const char*>(slices[i].begin()),
                       slices[i].size());
    }
    if (server_initial_metadata) {
      *server_initial_metadata = ctx_.GetServerInitialMetadata();
    }
  }
}

void CliCall::WritesDone() {
  void* got_tag;
  bool ok;

  call_->WritesDone(tag(3));
  cq_.Next(&got_tag, &ok);
  GPR_ASSERT(ok);
}

Status CliCall::Finish(IncomingMetadataContainer* server_trailing_metadata) {
  void* got_tag;
  bool ok;
  grpc::Status status;

  call_->Finish(&status, tag(5));
  cq_.Next(&got_tag, &ok);
  GPR_ASSERT(ok);
  if (server_trailing_metadata) {
    *server_trailing_metadata = ctx_.GetServerTrailingMetadata();
  }

  return status;
}

}  // namespace testing
}  // namespace grpc