gearman/examples/reverse_client_epoch.cc

/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 * 
 *  Gearmand client and server library.
 *
 *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
 *  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 *
 *      * Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *
 *      * Redistributions in binary form must reproduce the above
 *  copyright notice, this list of conditions and the following disclaimer
 *  in the documentation and/or other materials provided with the
 *  distribution.
 *
 *      * The names of its contributors may not be used to endorse or
 *  promote products derived from this software without specific prior
 *  written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */


#include "config.h"

#include <cstdlib>
#include <iomanip>
#include <iostream>
#include <string>

#include <libgearman/gearman.h>
#include <boost/program_options.hpp>

#pragma GCC diagnostic ignored "-Wold-style-cast"

int main(int args, char *argv[])
{
  in_port_t port;
  int timeout;
  time_t epoch;
  std::string host;
  std::string text_to_echo;

  boost::program_options::options_description desc("Options");
  desc.add_options()
    ("help", "Options related to the program.")
    ("host,h", boost::program_options::value<std::string>(&host)->default_value("localhost"),"Connect to the host")
    ("port,p", boost::program_options::value<in_port_t>(&port)->default_value(GEARMAN_DEFAULT_TCP_PORT), "Port number use for connection")
    ("timeout,u", boost::program_options::value<int>(&timeout)->default_value(-1), "Timeout in milliseconds")
    ("epoch", boost::program_options::value<time_t>(&epoch)->default_value(10), "Seconds forward in time for task to run.")
    ("text", boost::program_options::value<std::string>(&text_to_echo), "Text used for echo")
            ;

  boost::program_options::positional_options_description text_options;
  text_options.add("text", -1);

  boost::program_options::variables_map vm;
  try
  {
    boost::program_options::store(boost::program_options::command_line_parser(args, argv).
                                  options(desc).positional(text_options).run(), vm);
    boost::program_options::notify(vm);
  }
  catch(std::exception &e)
  { 
    std::cout << e.what() << std::endl;
    return EXIT_FAILURE;
  }

  if (vm.count("help"))
  {
    std::cout << desc << std::endl;
    return EXIT_SUCCESS;
  }

  if (text_to_echo.empty())
  {
    while(std::cin.good())
    { 
      char buffer[1024];

      std::cin.read(buffer, sizeof(buffer));
      text_to_echo.append(buffer, std::cin.gcount());
    }

    if (text_to_echo.empty())
    {
      std::cerr << "No text was provided for --text or via stdin" << std::endl;
      std::cerr << desc << std::endl;
      return EXIT_FAILURE;
    }
  }

  gearman_client_st client;
  if (gearman_client_create(&client) == NULL)
  {
    std::cerr << "Memory allocation failure on client creation" << std::endl;
    return EXIT_FAILURE;
  }

  gearman_return_t ret;
  ret= gearman_client_add_server(&client, host.c_str(), port);
  if (ret != GEARMAN_SUCCESS)
  {
    std::cerr << gearman_client_error(&client) << std::endl;
    return EXIT_FAILURE;
  }

  if (timeout >= 0)
    gearman_client_set_timeout(&client, timeout);

  gearman_function_t *function= gearman_function_create(gearman_literal_param("reverse"));

  gearman_unique_t unique= gearman_unique_make(gearman_literal_param("epoch"));
  gearman_workload_t workload= gearman_workload_make(text_to_echo.c_str(), text_to_echo.size());
  gearman_workload_set_epoch(&workload, time(NULL) +epoch);

  gearman_status_t status= gearman_client_execute(&client,
                                                  function,
                                                  NULL,
                                                  &workload);
  if (not gearman_status_is_successful(status))
  {
    std::cerr << gearman_client_error(&client) << std::endl;
    return EXIT_FAILURE;
  }
  gearman_task_st *task= gearman_status_task(status);

  std::cout << "Background Job Handle=" << gearman_task_job_handle(task) << std::endl;

  int exit_code= EXIT_SUCCESS;
  while (gearman_task_is_running(task))
  {
    bool is_known;
    bool is_running;
    uint32_t numerator;
    uint32_t denominator;

    ret= gearman_client_job_status(&client, gearman_task_job_handle(task),
                                   &is_known, &is_running,
                                   &numerator, &denominator);
    if (ret != GEARMAN_SUCCESS)
    {
      std::cerr << gearman_client_error(&client) << std::endl;
      exit_code= EXIT_FAILURE;
    }

    std::cout << std::boolalpha 
      << "Known =" << is_known
      << ", Running=" << is_running
      << ", Percent Complete=" << numerator << "/" <<  denominator << std::endl;

    if (not is_known)
      break;

    sleep(1);
  }

  gearman_client_free(&client);

  return exit_code;
}