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 *
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "test/cpp/util/grpc_tool.h"

#include <sstream>

#include <grpc++/channel.h>
#include <grpc++/client_context.h>
#include <grpc++/create_channel.h>
#include <grpc++/ext/proto_server_reflection_plugin.h>
#include <grpc++/server.h>
#include <grpc++/server_builder.h>
#include <grpc++/server_context.h>
#include <grpc/grpc.h>
#include <gtest/gtest.h>

#include "src/proto/grpc/testing/echo.grpc.pb.h"
#include "src/proto/grpc/testing/echo.pb.h"
#include "test/core/util/port.h"
#include "test/core/util/test_config.h"
#include "test/cpp/util/cli_credentials.h"
#include "test/cpp/util/string_ref_helper.h"

using grpc::testing::EchoRequest;
using grpc::testing::EchoResponse;

namespace grpc {
namespace testing {
namespace {

class TestCliCredentials GRPC_FINAL : public grpc::testing::CliCredentials {
 public:
  std::shared_ptr<grpc::ChannelCredentials> GetCredentials() const
      GRPC_OVERRIDE {
    return InsecureChannelCredentials();
  }
  const grpc::string GetCredentialUsage() const GRPC_OVERRIDE { return ""; }
};

}  // namespame

class TestServiceImpl : public ::grpc::testing::EchoTestService::Service {
 public:
  Status Echo(ServerContext* context, const EchoRequest* request,
              EchoResponse* response) GRPC_OVERRIDE {
    if (!context->client_metadata().empty()) {
      for (std::multimap<grpc::string_ref, grpc::string_ref>::const_iterator
               iter = context->client_metadata().begin();
           iter != context->client_metadata().end(); ++iter) {
        context->AddInitialMetadata(ToString(iter->first),
                                    ToString(iter->second));
      }
    }
    context->AddTrailingMetadata("trailing_key", "trailing_value");
    response->set_message(request->message());
    return Status::OK;
  }
};

class GrpcToolTest : public ::testing::Test {
 protected:
  GrpcToolTest() {}

  // SetUpServer cannot be used with EXPECT_EXIT. grpc_pick_unused_port_or_die()
  // uses atexit() to free chosen ports, and it will spawn a new thread in
  // resolve_address_posix.c:192 at exit time.
  const grpc::string SetUpServer() {
    std::ostringstream server_address;
    int port = grpc_pick_unused_port_or_die();
    server_address << "localhost:" << port;
    // Setup server
    ServerBuilder builder;
    builder.AddListeningPort(server_address.str(), InsecureServerCredentials());
    builder.RegisterService(&service_);
    server_ = builder.BuildAndStart();
    return server_address.str();
  }

  void ShutdownServer() { server_->Shutdown(); }

  std::unique_ptr<Server> server_;
  TestServiceImpl service_;
  reflection::ProtoServerReflectionPlugin plugin_;
};

static bool PrintStream(std::stringstream* ss, const grpc::string& output) {
  (*ss) << output << std::endl;
  return true;
}

template <typename T>
static size_t ArraySize(T& a) {
  return ((sizeof(a) / sizeof(*(a))) /
          static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))));
}

#define USAGE_REGEX "(  grpc_cli .+\n){2,10}"

TEST_F(GrpcToolTest, NoCommand) {
  // Test input "grpc_cli"
  std::stringstream output_stream;
  const char* argv[] = {"grpc_cli"};
  // Exit with 1, print usage instruction in stderr
  EXPECT_EXIT(
      GrpcToolMainLib(
          ArraySize(argv), argv, TestCliCredentials(),
          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
      ::testing::ExitedWithCode(1), "No command specified\n" USAGE_REGEX);
  // No output
  EXPECT_TRUE(0 == output_stream.tellp());
}

TEST_F(GrpcToolTest, InvalidCommand) {
  // Test input "grpc_cli"
  std::stringstream output_stream;
  const char* argv[] = {"grpc_cli", "abc"};
  // Exit with 1, print usage instruction in stderr
  EXPECT_EXIT(
      GrpcToolMainLib(
          ArraySize(argv), argv, TestCliCredentials(),
          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
      ::testing::ExitedWithCode(1), "Invalid command 'abc'\n" USAGE_REGEX);
  // No output
  EXPECT_TRUE(0 == output_stream.tellp());
}

TEST_F(GrpcToolTest, HelpCommand) {
  // Test input "grpc_cli help"
  std::stringstream output_stream;
  const char* argv[] = {"grpc_cli", "help"};
  // Exit with 1, print usage instruction in stderr
  EXPECT_EXIT(GrpcToolMainLib(ArraySize(argv), argv, TestCliCredentials(),
                              std::bind(PrintStream, &output_stream,
                                        std::placeholders::_1)),
              ::testing::ExitedWithCode(1), USAGE_REGEX);
  // No output
  EXPECT_TRUE(0 == output_stream.tellp());
}

TEST_F(GrpcToolTest, CallCommand) {
  // Test input "grpc_cli call Echo"
  std::stringstream output_stream;

  const grpc::string server_address = SetUpServer();
  const char* argv[] = {"grpc_cli", "call", server_address.c_str(), "Echo",
                        "message: 'Hello'"};

  EXPECT_TRUE(0 == GrpcToolMainLib(ArraySize(argv), argv, TestCliCredentials(),
                                   std::bind(PrintStream, &output_stream,
                                             std::placeholders::_1)));
  // Expected output: "message: \"Hello\""
  EXPECT_TRUE(NULL !=
              strstr(output_stream.str().c_str(), "message: \"Hello\""));
  ShutdownServer();
}

TEST_F(GrpcToolTest, TooFewArguments) {
  // Test input "grpc_cli call localhost:<port> Echo "message: 'Hello'"
  std::stringstream output_stream;
  const char* argv[] = {"grpc_cli", "call", "Echo"};

  // Exit with 1
  EXPECT_EXIT(
      GrpcToolMainLib(
          ArraySize(argv), argv, TestCliCredentials(),
          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
      ::testing::ExitedWithCode(1), ".*Wrong number of arguments for call.*");
  // No output
  EXPECT_TRUE(0 == output_stream.tellp());
}

TEST_F(GrpcToolTest, TooManyArguments) {
  // Test input "grpc_cli call localhost:<port> Echo Echo "message: 'Hello'"
  std::stringstream output_stream;
  const char* argv[] = {"grpc_cli", "call", "localhost:10000",
                        "Echo",     "Echo", "message: 'Hello'"};

  // Exit with 1
  EXPECT_EXIT(
      GrpcToolMainLib(
          ArraySize(argv), argv, TestCliCredentials(),
          std::bind(PrintStream, &output_stream, std::placeholders::_1)),
      ::testing::ExitedWithCode(1), ".*Wrong number of arguments for call.*");
  // No output
  EXPECT_TRUE(0 == output_stream.tellp());
}

}  // namespace testing
}  // namespace grpc

int main(int argc, char** argv) {
  grpc_test_init(argc, argv);
  ::testing::InitGoogleTest(&argc, argv);
  ::testing::FLAGS_gtest_death_test_style = "threadsafe";
  return RUN_ALL_TESTS();
}