text: /*    Copyright 2013 10gen Inc.
   *
   *    This program is free software: you can redistribute it and/or  modify
   *    it under the terms of the GNU Affero General Public License, version 3,
   *    as published by the Free Software Foundation.
   *
   *    This program is distributed in the hope that it will be useful,
   *    but WITHOUT ANY WARRANTY; without even the implied warranty of
   *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *    GNU Affero General Public License for more details.
   *
   *    You should have received a copy of the GNU Affero General Public License
   *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
   *
   *    As a special exception, the copyright holders give permission to link the
   *    code of portions of this program with the OpenSSL library under certain
   *    conditions as described in each individual source file and distribute
   *    linked combinations including the program with the OpenSSL library. You
   *    must comply with the GNU Affero General Public License in all respects
   *    for all of the code used other than as permitted herein. If you modify
   *    file(s) with this exception, you may extend this exception to your
   *    version of the file(s), but you are not obligated to do so. If you do not
   *    wish to do so, delete this exception statement from your version. If you
   *    delete this exception statement from all source files in the program,
   *    then also delete it in the license file.
   */
  
  #pragma once
  
  #ifndef _WIN32  // TODO(schwerin): Should be #if MONGO_CONFIG_HAVE_SYSLOG_H?
  
  #include <sstream>
  #include <syslog.h>
  
  #include "mongol/base/disallow_copying.h"
  #include "mongol/base/status.h"
  #include "mongol/logger/appender.h"
  #include "mongol/logger/encoder.h"
  
  namespace mongol {
  namespace logger {
  
  /**
   * Appender for writing to syslog.  Users must have separately called openlog().
   */
  template <typename Event>
  class SyslogAppender : public Appender<Event> {
      MONGO_DISALLOW_COPYING(SyslogAppender);
  
  public:
      typedef Encoder<Event> EventEncoder;
  
      explicit SyslogAppender(EventEncoder* encoder) : _encoder(encoder) {}
      virtual Status append(const Event& event) {
          std::ostringstream os;
          _encoder->encode(event, os);
          if (!os)
              return Status(ErrorCodes::LogWriteFailed, "Error writing log message to syslog.");
          syslog(getSyslogPriority(event.getSeverity()), "%s", os.str().c_str());
          return Status::OK();
      }
  
  private:
      int getSyslogPriority(LogSeverity severity) {
          if (severity <= LogSeverity::Debug(1))
              return LOG_DEBUG;
          if (severity == LogSeverity::Warning())
              return LOG_WARNING;
          if (severity == LogSeverity::Error())
              return LOG_ERR;
          if (severity >= LogSeverity::Severe())
              return LOG_CRIT;
          // Info() and Log().
          return LOG_INFO;
      }
      std::unique_ptr<EventEncoder> _encoder;
  };
  
  }  // namespace logger
  }  // namespace mongol
  
  #endif
  