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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_NATIVE_MESSAGING_LOG_MESSAGE_HANDLER_H_
#define REMOTING_HOST_NATIVE_MESSAGING_LOG_MESSAGE_HANDLER_H_
#include <stddef.h>
#include <memory>
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace remoting {
// Helper class for logging::SetLogMessageHandler to deliver log messages to
// a consistent thread in a thread-safe way and in a format suitable for sending
// over a Native Messaging channel.
class LogMessageHandler {
public:
using Delegate = base::RepeatingCallback<void(base::Value::Dict message)>;
explicit LogMessageHandler(const Delegate& delegate);
~LogMessageHandler();
// When set to true, if a message is logged on the caller thread, the message
// will be synchronously sent to the delegate; otherwise a task will always
// be posted to the caller thread to handle the message. Defaults to false to
// prevent blocking LOG calls. Set this to false if you want to make sure a
// log gets handled when the caller sequence is about to be terminated.
void set_log_synchronously_if_possible(bool log_synchronously_if_possible) {
log_synchronously_if_possible_ = log_synchronously_if_possible;
}
static const char* kDebugMessageTypeName;
private:
// TODO(yuweih): Reimplement this class using using a message queue which is
// protected by |g_log_message_handler_lock|.
static bool OnLogMessage(int severity,
const char* file,
int line,
size_t message_start,
const std::string& str);
void PostLogMessageToCorrectThread(int severity,
const char* file,
int line,
size_t message_start,
const std::string& str);
void SendLogMessageToClient(int severity,
const char* file,
int line,
size_t message_start,
const std::string& str);
Delegate delegate_;
bool suppress_logging_;
bool log_synchronously_if_possible_ = false;
// TODO(yuweih): Replace all "thread" references in this class with
// "sequence".
scoped_refptr<base::SingleThreadTaskRunner> caller_task_runner_;
logging::LogMessageHandlerFunction previous_log_message_handler_;
base::WeakPtrFactory<LogMessageHandler> weak_ptr_factory_{this};
};
} // namespace remoting
#endif // REMOTING_HOST_NATIVE_MESSAGING_LOG_MESSAGE_HANDLER_H_
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