pagespeed/apache/apache_message_handler.h

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

#ifndef PAGESPEED_APACHE_APACHE_MESSAGE_HANDLER_H_
#define PAGESPEED_APACHE_APACHE_MESSAGE_HANDLER_H_

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/message_handler.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/system/system_message_handler.h"

struct server_rec;

namespace net_instaweb {

class AbstractMutex;
class Timer;

// Implementation of an HTML parser message handler that uses Apache
// logging to emit messsages.
class ApacheMessageHandler : public SystemMessageHandler {
 public:
  // version is a string added to each message.
  // Timer is used to generate timestamp for messages in shared memory.
  ApacheMessageHandler(const server_rec* server, const StringPiece& version,
                       Timer* timer, AbstractMutex* mutex);

  // Installs a signal handler for common crash signals that tries to print
  // out a backtrace.
  static void InstallCrashHandler(server_rec* global_server);

 protected:
  void MessageSImpl(MessageType type, const GoogleString& message) override;

  void FileMessageSImpl(MessageType type, const char* filename, int line,
                        const GoogleString& message) override;

 private:
  int GetApacheLogLevel(MessageType type);

  const server_rec* server_rec_;
  const GoogleString version_;

  DISALLOW_COPY_AND_ASSIGN(ApacheMessageHandler);
};

}  // namespace net_instaweb

#endif  // PAGESPEED_APACHE_APACHE_MESSAGE_HANDLER_H_