json_run_localhost.cc

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/*
 *
 * Copyright 2015-2016 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.
 *
 */
 
#include <signal.h>
#include <string.h>
 
#include <memory>
#include <mutex>
#include <sstream>
#include <string>
 
#ifdef __FreeBSD__
#include <sys/wait.h>
#endif
 
#include <grpc/support/log.h>
 
#include "src/core/lib/gpr/env.h"
#include "test/core/util/port.h"
#include "test/cpp/util/subprocess.h"
 
using grpc::SubProcess;
 
constexpr auto kNumWorkers = 2;
 
static SubProcess* g_driver;
static SubProcess* g_workers[kNumWorkers];
 
template <class T>
std::string as_string(const T& val) {
  std::ostringstream out;
  out << val;
  return out.str();
}
 
static void sighandler(int /*sig*/) {
  const int errno_saved = errno;
  if (g_driver != nullptr) g_driver->Interrupt();
  for (int i = 0; i < kNumWorkers; ++i) {
    if (g_workers[i]) g_workers[i]->Interrupt();
  }
  errno = errno_saved;
}
 
static void register_sighandler() {
  struct sigaction act;
  memset(&act, 0, sizeof(act));
  act.sa_handler = sighandler;
 
  sigaction(SIGINT, &act, nullptr);
  sigaction(SIGTERM, &act, nullptr);
}
 
static void LogStatus(int status, const char* label) {
  if (WIFEXITED(status)) {
    gpr_log(GPR_INFO, "%s: subprocess exited with status %d", label,
            WEXITSTATUS(status));
  } else if (WIFSIGNALED(status)) {
    gpr_log(GPR_INFO, "%s: subprocess terminated with signal %d", label,
            WTERMSIG(status));
  } else {
    gpr_log(GPR_INFO, "%s: unknown subprocess status: %d", label, status);
  }
}
 
int main(int argc, char** argv) {
  register_sighandler();
 
  std::string my_bin = argv[0];
  std::string bin_dir = my_bin.substr(0, my_bin.rfind('/'));
 
  std::ostringstream env;
  bool first = true;
 
  for (int i = 0; i < kNumWorkers; i++) {
    const auto driver_port = grpc_pick_unused_port_or_die();
    // ServerPort can be used or not later depending on the type of worker
    // but we like to issue all ports required here to avoid port conflict.
    const auto server_port = grpc_pick_unused_port_or_die();
    std::vector<std::string> args = {bin_dir + "/qps_worker", "-driver_port",
                                     as_string(driver_port), "-server_port",
                                     as_string(server_port)};
    g_workers[i] = new SubProcess(args);
    if (!first) env << ",";
    env << "localhost:" << driver_port;
    first = false;
  }
 
  gpr_setenv("QPS_WORKERS", env.str().c_str());
  std::vector<std::string> args = {bin_dir + "/qps_json_driver"};
  for (int i = 1; i < argc; i++) {
    args.push_back(argv[i]);
  }
 
  g_driver = new SubProcess(args);
  const int driver_join_status = g_driver->Join();
  if (driver_join_status != 0) {
    LogStatus(driver_join_status, "driver");
  }
  for (int i = 0; i < kNumWorkers; ++i) {
    if (g_workers[i]) g_workers[i]->Interrupt();
  }
 
  for (int i = 0; i < kNumWorkers; ++i) {
    if (g_workers[i]) {
      const int worker_status = g_workers[i]->Join();
      if (worker_status != 0) {
        LogStatus(worker_status, "worker");
      }
    }
  }
 
  delete g_driver;
 
  g_driver = nullptr;
  for (int i = 0; i < kNumWorkers; ++i) {
    if (g_workers[i] != nullptr) {
      delete g_workers[i];
    }
  }
  GPR_ASSERT(driver_join_status == 0);
}