gfe-relnote: Default-initialize QUIC BBRv2 loss event threshold for exiting STARTUP from a flag. Protected by --gfe2_reloadable_flag_quic_default_to_bbr_v2.
PiperOrigin-RevId: 264298542
Change-Id: I304ab19e4820dec51d3f8ef53762a393f6b175fd
diff --git a/quic/qbone/qbone_packet_exchanger.h b/quic/qbone/qbone_packet_exchanger.h
new file mode 100644
index 0000000..8620a49
--- /dev/null
+++ b/quic/qbone/qbone_packet_exchanger.h
@@ -0,0 +1,80 @@
+// 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.
+
+#ifndef QUICHE_QUIC_QBONE_QBONE_PACKET_EXCHANGER_H_
+#define QUICHE_QUIC_QBONE_QBONE_PACKET_EXCHANGER_H_
+
+#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 {
+ public:
+ // The owner might want to receive notifications when read or write fails.
+ class Visitor {
+ public:
+ 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();
+
+ private:
+ // 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
+
+#endif // QUICHE_QUIC_QBONE_QBONE_PACKET_EXCHANGER_H_
