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// Copyright (c) 2019 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 "net/third_party/quiche/src/quic/core/quic_packets.h"
#include "net/third_party/quiche/src/quic/qbone/qbone_client_interface.h"
#include "net/third_party/quiche/src/quic/qbone/qbone_packet_writer.h"
namespace quic {
// Handles reading and writing on the local network and exchange packets between
// the local network with a Qbone connection.
class QbonePacketExchanger : public QbonePacketWriter {
// The owner might want to receive notifications when read or write fails.
class Visitor {
virtual ~Visitor() {}
virtual void OnReadError(const string& error) {}
virtual void OnWriteError(const string& error) {}
// Does not take ownership of visitor.
QbonePacketExchanger(Visitor* visitor, size_t max_pending_packets)
: visitor_(visitor), max_pending_packets_(max_pending_packets) {}
QbonePacketExchanger(const QbonePacketExchanger&) = delete;
QbonePacketExchanger& operator=(const QbonePacketExchanger&) = delete;
QbonePacketExchanger(QbonePacketExchanger&&) = delete;
QbonePacketExchanger& operator=(QbonePacketExchanger&&) = delete;
~QbonePacketExchanger() = default;
// Returns true if there may be more packets to read.
// Implementations handles the actual raw read and delivers the packet to
// qbone_client.
bool ReadAndDeliverPacket(QboneClientInterface* qbone_client);
// From QbonePacketWriter.
// Writes a packet to the local network. If the write would be blocked, the
// packet will be queued if the queue is smaller than max_pending_packets_.
void WritePacketToNetwork(const char* packet, size_t size) override;
// The caller signifies that the local network is no longer blocked.
void SetWritable();
// The actual implementation that reads a packet from the local network.
// Returns the packet if one is successfully read. This might nullptr when a)
// there is no packet to read, b) the read failed. In the former case, blocked
// is set to true. error contains the error message.
virtual std::unique_ptr<QuicData> ReadPacket(bool* blocked,
string* error) = 0;
// The actual implementation that writes a packet to the local network.
// Returns true if the write succeeds. blocked will be set to true if the
// write failure is caused by the local network being blocked. error contains
// the error message.
virtual bool WritePacket(const char* packet,
size_t size,
bool* blocked,
string* error) = 0;
std::list<std::unique_ptr<QuicData>> packet_queue_;
Visitor* visitor_;
// The maximum number of packets that could be queued up when writing to local
// network is blocked.
size_t max_pending_packets_;
bool write_blocked_ = false;
} // namespace quic