blob: 482d48fb2c4c6bcdf62de23c08e95a39475a95c9 [file] [log] [blame]
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/callback.h"
#include "base/files/file.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread.h"
namespace base {
class SequencedTaskRunner;
class Value;
} // namespace base
namespace remoting {
// This class is used for reading messages from the Native Messaging client
// webapp.
class NativeMessagingReader {
typedef base::Callback<void(std::unique_ptr<base::Value>)> MessageCallback;
explicit NativeMessagingReader(base::File file);
// Begin reading messages from the Native Messaging client webapp, calling
// |message_callback| for each received message, or |eof_callback| if
// EOF or error is encountered. This method is asynchronous - the callbacks
// will be run on the same thread via PostTask. The caller should be prepared
// for these callbacks to be invoked right up until this object is destroyed.
void Start(MessageCallback message_callback, base::Closure eof_callback);
class Core;
friend class Core;
// Wrappers posted to by the read thread to trigger the message and EOF
// callbacks on the caller thread, and have them safely dropped if the reader
// has been deleted before they are processed.
void InvokeMessageCallback(std::unique_ptr<base::Value> message);
void InvokeEofCallback();
// Holds the information that the read thread needs to access, such as the
// File, and the TaskRunner used for posting notifications back to this
// class.
std::unique_ptr<Core> core_;
// Caller-supplied message and end-of-file callbacks.
MessageCallback message_callback_;
base::Closure eof_callback_;
// Separate thread used to read from the stream without blocking the main
// thread. net::FileStream's async API cannot be used here because, on
// Windows, it requires the file handle to have been opened for overlapped IO.
base::Thread reader_thread_;
scoped_refptr<base::SequencedTaskRunner> read_task_runner_;
// Allows the reader to be deleted safely even when tasks may be pending on
// it.
base::WeakPtrFactory<NativeMessagingReader> weak_factory_;
} // namespace remoting