/*

 * 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.
 *
 */

/*
  A command line tool to talk to a grpc server.
  Run `grpc_cli help` command to see its usage information.

  Example of talking to grpc interop server:
  grpc_cli call localhost:50051 UnaryCall "response_size:10" \
      --protofiles=src/proto/grpc/testing/test.proto \
      --channel_creds_type=insecure

  Options:
    1. --protofiles, use this flag to provide proto files if the server does
       does not have the reflection service.
    2. --proto_path, if your proto file is not under current working directory,
       use this flag to provide a search root. It should work similar to the
       counterpart in protoc. This option is valid only when protofiles is
       provided.
    3. --metadata specifies metadata to be sent to the server, such as:
       --metadata="MyHeaderKey1:Value1:MyHeaderKey2:Value2"
    4. --channel_creds_type, whether to use tls, insecure or platform-specific
       options.
    5. --use_auth, if set to true, attach a GoogleDefaultCredentials to the call
    6. --infile, input filename (defaults to stdin)
    7. --outfile, output filename (defaults to stdout)
    8. --binary_input, use the serialized request as input. The serialized
       request can be generated by calling something like:
       protoc --proto_path=src/proto/grpc/testing/ \
         --encode=grpc.testing.SimpleRequest \
         src/proto/grpc/testing/messages.proto \
         < input.txt > input.bin
       If this is used and no proto file is provided in the argument list, the
       method string has to be exact in the form of /package.service/method.
    9. --binary_output, use binary format response as output, it can
       be later decoded using protoc:
       protoc --proto_path=src/proto/grpc/testing/ \
       --decode=grpc.testing.SimpleResponse \
       src/proto/grpc/testing/messages.proto \
       < output.bin > output.txt
   10. --default_service_config, optional default service config to use
       on the channel. Note that this may be ignored if the name resolver
       returns a service config.
   11. --display_peer_address, on CallMethod commands, log the peer socket
       address of the connection that each RPC is made on to stderr.
*/

#include <fstream>
#include <functional>
#include <iostream>

#include "absl/flags/flag.h"

#include <grpcpp/support/config.h>

#include "test/cpp/util/cli_credentials.h"
#include "test/cpp/util/grpc_tool.h"
#include "test/cpp/util/test_config.h"

ABSL_FLAG(std::string, outfile, "", "Output file (default is stdout)");

static bool SimplePrint(const std::string& outfile, const std::string& output) {
  if (outfile.empty()) {
    std::cout << output << std::flush;
  } else {
    std::ofstream output_file(outfile, std::ios::app | std::ios::binary);
    output_file << output << std::flush;
    output_file.close();
  }
  return true;
}

int main(int argc, char** argv) {
  grpc::testing::InitTest(&argc, &argv, true);

  return grpc::testing::GrpcToolMainLib(
      argc, const_cast<const char**>(argv), grpc::testing::CliCredentials(),
      std::bind(SimplePrint, absl::GetFlag(FLAGS_outfile),
                std::placeholders::_1));
}