gearman/libgearman/interface/error.hpp

/*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 * 
 *  Gearmand client and server library.
 *
 *  Copyright (C) 2013 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.
 *
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 *  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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 */

#pragma once

#include <cstdio>

struct error_st {
  error_st():
    _rc(GEARMAN_SUCCESS),
    _last_errno{0}
  {
    _last_error[0]= 0;
  }

  error_st(gearman_return_t rc_):
    _rc(rc_),
    _last_errno{0}
  {
    _last_error[0]= 0;
  }

  void clear()
  {
    _rc= GEARMAN_UNKNOWN_STATE;
    _last_error[0]= 0;
    _last_errno= 0;
  }

  void system_error(const int errno_)
  {
    _last_errno= errno_;
  }

  int system_error() const
  {
    return _last_errno;
  }

  gearman_return_t error_code(const gearman_return_t rc_)
  {
    return _rc= rc_;
  }

  gearman_return_t error_code() const
  {
    return _rc;
  }

  const char* error() const
  {
    if (_rc != GEARMAN_SUCCESS and _rc != GEARMAN_UNKNOWN_STATE)
    {
      if (_last_error[0] == 0)
      {
        return gearman_strerror(_rc);
      }

      return _last_error;
    }

    return nullptr;
  }

  const char* error(const char * __restrict, ...);

private:
  gearman_return_t _rc;
  int _last_errno;
  char _last_error[GEARMAN_MAX_ERROR_SIZE];

};