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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_TEST_CHROMEDRIVER_NET_PIPE_WRITER_POSIX_H_
#define CHROME_TEST_CHROMEDRIVER_NET_PIPE_WRITER_POSIX_H_
#include "base//files/scoped_file.h"
#include "base/memory/scoped_refptr.h"
#include "base/message_loop/message_pump_for_io.h"
#include "base/threading/thread_checker.h"
#include "net/base/completion_once_callback.h"
namespace net {
class IOBuffer;
}
// Non-blocking pipe writer implemented on top of POSIX API.
class PipeWriterPosix : public base::MessagePumpForIO::FdWatcher {
public:
PipeWriterPosix();
PipeWriterPosix(const PipeWriterPosix&) = delete;
PipeWriterPosix& operator=(const PipeWriterPosix&) = delete;
~PipeWriterPosix() override;
// Attach the writer to the file descriptor.
int Bind(base::ScopedFD fd);
bool IsConnected() const;
// Non-blocking write to the underlying pipe.
// In case if the operation can be accomplished immediately without blocking:
// * If succeeded the amount of written bytes is returned.
// * If failed the error code is returned.
// In case if the operation cannot be accomplished immediately:
// * net::ERR_IO_PENDING is returned.
// * The callback is invoked after the asynchronous write.
// * If succeeded the amount of written bytes is passed to the callback.
// * If failed the error code is passed to the callback.
int Write(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback);
// Stop watching the file descriptor and close it immediately.
void Close();
// Detaches from the current thread, to allow the writer to be transferred to
// a new thread. Should only be called when the object is no longer used by
// the old thread.
void DetachFromThread();
private:
// base::MessagePumpForIO::FdWatcher methods.
void OnFileCanReadWithoutBlocking(int fd) override;
void OnFileCanWriteWithoutBlocking(int fd) override;
// Waits for next write event. Returns ERR_IO_PENDING if it starts
// waiting for write event successfully. Otherwise, returns a net error code.
// It must not be called after Write() because Write() calls it internally.
int WaitForWrite(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback);
int DoWrite(net::IOBuffer* buf, int buf_len);
THREAD_CHECKER(thread_checker_);
base::ScopedFD fd_;
base::MessagePumpForIO::FdWatchController write_fd_watcher_;
scoped_refptr<net::IOBuffer> write_buf_;
int write_buf_len_ = 0;
// External callback; called when write or connect is complete.
net::CompletionOnceCallback write_callback_;
bool is_connected_ = false;
};
#endif // CHROME_TEST_CHROMEDRIVER_NET_PIPE_WRITER_POSIX_H_
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