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// Copyright 2008, Google Inc.
// 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may 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
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef CHROME_COMMON_IPC_LOGGING_H_
#define CHROME_COMMON_IPC_LOGGING_H_
#include "base/lock.h"
#include "base/object_watcher.h"
#include "base/singleton.h"
#include "chrome/common/ipc_message.h" // For IPC_MESSAGE_LOG_ENABLED.
#ifdef IPC_MESSAGE_LOG_ENABLED
class MessageLoop;
namespace IPC {
class Message;
// One instance per process. Needs to be created on the main thread (the UI
// thread in the browser) but OnPreDispatchMessage/OnPostDispatchMessage
// can be called on other threads.
class Logging : public base::ObjectWatcher::Delegate {
public:
// Implemented by consumers of log messages.
class Consumer {
public:
virtual void Log(const IPC::LogData& data) = 0;
};
void SetConsumer(Consumer* consumer);
~Logging();
static Logging* current();
void Enable();
void Disable();
bool inline Enabled() const;
// Called by child processes to give the logger object the channel to send
// logging data to the browser process.
void SetIPCSender(IPC::Message::Sender* sender);
// Called in the browser process when logging data from a child process is
// received.
void OnReceivedLoggingMessage(const Message& message);
void OnSendMessage(Message* message, const std::wstring& channel_id);
void OnPreDispatchMessage(const Message& message);
void OnPostDispatchMessage(const Message& message,
const std::wstring& channel_id);
// Returns the name of the logging enabled/disabled events so that the
// sandbox can add them to to the policy. If true, gets the name of the
// enabled event, if false, gets the name of the disabled event.
static std::wstring GetEventName(bool enabled);
// Like the *MsgLog functions declared for each message class, except this
// calls the correct one based on the message type automatically. Defined in
// ipc_logging.cc.
static void GetMessageText(uint16 type, std::wstring* name,
const Message* message, std::wstring* params);
// ObjectWatcher::Delegate implementation
void OnObjectSignaled(HANDLE object);
private:
friend struct DefaultSingletonTraits<IPC::Logging>;
Logging();
std::wstring GetEventName(int browser_pid, bool enabled);
void OnSendLogs();
void Log(const LogData& data);
void RegisterWaitForEvent(bool enabled);
base::ObjectWatcher watcher_;
HANDLE logging_event_on_;
HANDLE logging_event_off_;
bool enabled_;
std::vector<LogData> queued_logs_;
bool queue_invoke_later_pending_;
IPC::Message::Sender* sender_;
MessageLoop* main_thread_;
Consumer* consumer_;
};
} // namespace IPC
#endif // IPC_MESSAGE_LOG_ENABLED
#endif // CHROME_COMMON_IPC_LOGGING_H_
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