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// 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.
#ifndef NET_QUIC_QUIC_PACKET_WRITER_H_
#define NET_QUIC_QUIC_PACKET_WRITER_H_
#include <stddef.h>
#include "net/base/ip_endpoint.h"
#include "net/quic/quic_protocol.h"
namespace net {
struct WriteResult;
// An interface between writers and the entity managing the
// socket (in our case the QuicDispatcher). This allows the Dispatcher to
// control writes, and manage any writers who end up write blocked.
class NET_EXPORT_PRIVATE QuicPacketWriter {
public:
virtual ~QuicPacketWriter() {}
// Sends the packet out to the peer. If the write succeeded, the result's
// status is WRITE_STATUS_OK and bytes_written is populated. If the write
// failed, the result's status is WRITE_STATUS_BLOCKED or WRITE_STATUS_ERROR
// and error_code is populated.
virtual WriteResult WritePacket(const char* buffer,
size_t buf_len,
const IPAddressNumber& self_address,
const IPEndPoint& peer_address) = 0;
// Returns true if the writer buffers and subsequently rewrites data
// when an attempt to write results in the underlying socket becoming
// write blocked.
virtual bool IsWriteBlockedDataBuffered() const = 0;
// Returns true if the network socket is not writable.
virtual bool IsWriteBlocked() const = 0;
// Records that the socket has become writable, for example when an EPOLLOUT
// is received or an asynchronous write completes.
virtual void SetWritable() = 0;
// Returns the maximum size of the packet which can be written using this
// writer for the supplied peer address. This size may actually exceed the
// size of a valid QUIC packet.
virtual QuicByteCount GetMaxPacketSize(
const IPEndPoint& peer_address) const = 0;
};
} // namespace net
#endif // NET_QUIC_QUIC_PACKET_WRITER_H_
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