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/*
* Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef NET_DCSCTP_SOCKET_CONTEXT_H_
#define NET_DCSCTP_SOCKET_CONTEXT_H_
#include <cstdint>
#include "absl/strings/string_view.h"
#include "net/dcsctp/common/internal_types.h"
#include "net/dcsctp/packet/sctp_packet.h"
#include "net/dcsctp/public/dcsctp_socket.h"
#include "net/dcsctp/public/types.h"
namespace dcsctp {
// A set of helper methods used by handlers to e.g. send packets.
//
// Implemented by the TransmissionControlBlock.
class Context {
public:
virtual ~Context() = default;
// Indicates if a connection has been established.
virtual bool is_connection_established() const = 0;
// Returns this side's initial TSN value.
virtual TSN my_initial_tsn() const = 0;
// Returns the peer's initial TSN value.
virtual TSN peer_initial_tsn() const = 0;
// Returns the socket callbacks.
virtual DcSctpSocketCallbacks& callbacks() const = 0;
// Observes a measured RTT value, in milliseconds.
virtual void ObserveRTT(DurationMs rtt_ms) = 0;
// Returns the current Retransmission Timeout (rto) value, in milliseconds.
virtual DurationMs current_rto() const = 0;
// Increments the transmission error counter, given a human readable reason.
virtual bool IncrementTxErrorCounter(absl::string_view reason) = 0;
// Clears the transmission error counter.
virtual void ClearTxErrorCounter() = 0;
// Returns true if there have been too many retransmission errors.
virtual bool HasTooManyTxErrors() const = 0;
// Returns a PacketBuilder, filled in with the correct verification tag.
virtual SctpPacket::Builder PacketBuilder() const = 0;
// Builds the packet from `builder` and sends it.
virtual void Send(SctpPacket::Builder& builder) = 0;
};
} // namespace dcsctp
#endif // NET_DCSCTP_SOCKET_CONTEXT_H_
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