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