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Diffstat (limited to 'libtransport/src/protocols/rtc/probe_handler.h')
-rw-r--r-- | libtransport/src/protocols/rtc/probe_handler.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/libtransport/src/protocols/rtc/probe_handler.h b/libtransport/src/protocols/rtc/probe_handler.h new file mode 100644 index 000000000..d989194d4 --- /dev/null +++ b/libtransport/src/protocols/rtc/probe_handler.h @@ -0,0 +1,93 @@ +/* + * 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 |