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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <hicn/transport/config.h>
#include <hicn/transport/core/asio_wrapper.h>
#include <functional>
#include <random>
#include <unordered_map>
namespace transport {
namespace protocol {
namespace rtc {
enum class ProbeType {
NOT_PROBE,
INIT,
RTT,
};
class ProbeHandler : public std::enable_shared_from_this<ProbeHandler> {
public:
using SendProbeCallback = std::function<void(uint32_t)>;
public:
ProbeHandler(SendProbeCallback &&send_callback, asio::io_service &io_service);
~ProbeHandler();
// If the function returns 0 the probe is not valid.
uint64_t getRtt(uint32_t seq, bool is_valid);
// this function may return a residual loss rate higher than the real one if
// we don't wait enough time for the probes to come back
double getProbeLossRate();
// Set the probe suffix range [min, max]
void setSuffixRange(uint32_t min, uint32_t max);
// Reset the probes parameters and stops the current probing.
// probe_interval = 0 means that no event will be scheduled.
// max_probe = 0 means no limit to the number of probe to send.
void setProbes(uint32_t probe_interval, uint32_t max_probes);
void stopProbes();
void sendProbes();
static ProbeType getProbeType(uint32_t seq);
private:
void generateProbe();
uint32_t probe_interval_; // us
uint32_t max_probes_; // packets
uint32_t sent_probes_; // packets
uint32_t recv_probes_; // packets
bool valid_batch_; // if at least one probe in a batch is considered not
// valid (e.g. prod rate == ~0) the full batch is invalid.
// the bool is set to true when sendProbe is called
std::unique_ptr<asio::steady_timer> probe_timer_;
// Map from packet suffixes to timestamp
std::unordered_map<uint32_t, uint64_t> pending_probes_;
// Random generator
std::default_random_engine rand_eng_;
std::uniform_int_distribution<uint32_t> distr_;
SendProbeCallback send_probe_callback_;
};
} // namespace rtc
} // namespace protocol
} // namespace transport
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