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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_API_SOCKET_MOJO_DATA_PUMP_H_
#define EXTENSIONS_BROWSER_API_SOCKET_MOJO_DATA_PUMP_H_
#include "base/memory/scoped_refptr.h"
#include "extensions/browser/api/socket/socket.h"
#include "mojo/public/cpp/system/data_pipe.h"
#include "mojo/public/cpp/system/simple_watcher.h"
#include "net/base/completion_once_callback.h"
namespace net {
class IOBuffer;
}
namespace extensions {
// Helper class to read from a mojo consumer handle and write to mojo producer
// handle.
class MojoDataPump {
public:
using ReadCallback =
base::OnceCallback<void(int, scoped_refptr<net::IOBuffer> io_buffer)>;
MojoDataPump(mojo::ScopedDataPipeConsumerHandle receive_stream,
mojo::ScopedDataPipeProducerHandle send_stream);
MojoDataPump(const MojoDataPump&) = delete;
MojoDataPump& operator=(const MojoDataPump&) = delete;
~MojoDataPump();
// Reads from |receive_stream|. It's illegal to call Read() when a previous
// one hasn't completed yet.
void Read(int count, ReadCallback callback);
// Writes to |send_stream|. It's illegal to call Write() when a previous one
// hasn't completed yet.
void Write(net::IOBuffer* io_buffer,
int io_buffer_size,
net::CompletionOnceCallback callback);
// Returns whether a read is pending.
bool HasPendingRead() const { return !read_callback_.is_null(); }
// Returns whether a write is pending.
bool HasPendingWrite() const { return !write_callback_.is_null(); }
private:
void OnReadComplete(scoped_refptr<net::IOBuffer> io_buffer, int result);
void StartWatching();
void ReceiveMore(MojoResult result, const mojo::HandleSignalsState& state);
void SendMore(MojoResult result, const mojo::HandleSignalsState& state);
mojo::ScopedDataPipeConsumerHandle receive_stream_;
mojo::SimpleWatcher receive_stream_watcher_;
mojo::ScopedDataPipeProducerHandle send_stream_;
mojo::SimpleWatcher send_stream_watcher_;
ReadCallback read_callback_;
net::CompletionOnceCallback write_callback_;
scoped_refptr<net::IOBuffer> pending_write_buffer_;
int pending_write_buffer_size_ = 0;
size_t read_size_ = 0;
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_API_SOCKET_MOJO_DATA_PUMP_H_
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