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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_TX_RETRANSMISSION_ERROR_COUNTER_H_
#define NET_DCSCTP_TX_RETRANSMISSION_ERROR_COUNTER_H_
#include <functional>
#include <string>
#include <utility>
#include "absl/strings/string_view.h"
#include "net/dcsctp/public/dcsctp_options.h"
namespace dcsctp {
// The RetransmissionErrorCounter is a simple counter with a limit, and when
// the limit is exceeded, the counter is exhausted and the connection will
// be closed. It's incremented on retransmission errors, such as the T3-RTX
// timer expiring, but also missing heartbeats and stream reset requests.
class RetransmissionErrorCounter {
public:
RetransmissionErrorCounter(absl::string_view log_prefix,
const DcSctpOptions& options)
: log_prefix_(std::string(log_prefix) + "rtx-errors: "),
limit_(options.max_retransmissions) {}
// Increments the retransmission timer. If the maximum error count has been
// reached, `false` will be returned.
bool Increment(absl::string_view reason);
bool IsExhausted() const { return limit_.has_value() && counter_ > *limit_; }
// Clears the retransmission errors.
void Clear();
// Returns its current value
int value() const { return counter_; }
private:
const std::string log_prefix_;
const absl::optional<int> limit_;
int counter_ = 0;
};
} // namespace dcsctp
#endif // NET_DCSCTP_TX_RETRANSMISSION_ERROR_COUNTER_H_
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