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++/completion_queue.h>
#include <grpc++/generic/generic_stub.h>
#include <grpc++/support/byte_buffer.h>
#include <grpc/grpc.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>

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

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) {
  std::unique_ptr<grpc::GenericStub> stub(new grpc::GenericStub(channel));
  grpc::ClientContext ctx;
  if (!metadata.empty()) {
    for (OutgoingMetadataContainer::const_iterator iter = metadata.begin();
         iter != metadata.end(); ++iter) {
      ctx.AddMetadata(iter->first, iter->second);
    }
  }
  grpc::CompletionQueue cq;
  std::unique_ptr<grpc::GenericClientAsyncReaderWriter> call(
      stub->Call(&ctx, method, &cq, tag(1)));
  void* got_tag;
  bool ok;
  cq.Next(&got_tag, &ok);
  GPR_ASSERT(ok);

  gpr_slice s = gpr_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);
  call->WritesDone(tag(3));
  cq.Next(&got_tag, &ok);
  GPR_ASSERT(ok);
  grpc::ByteBuffer recv_buffer;
  call->Read(&recv_buffer, tag(4));
  cq.Next(&got_tag, &ok);
  if (!ok) {
    std::cout << "Failed to read response." << std::endl;
    return Status(StatusCode::INTERNAL, "Failed to read response");
  }
  grpc::Status status;
  call->Finish(&status, tag(5));
  cq.Next(&got_tag, &ok);
  GPR_ASSERT(ok);

  if (status.ok()) {
    std::vector<grpc::Slice> slices;
    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());
    }
  }
  *server_initial_metadata = ctx.GetServerInitialMetadata();
  *server_trailing_metadata = ctx.GetServerTrailingMetadata();
  return status;
}

}  // namespace testing
}  // namespace grpc