diff options
Diffstat (limited to 'libtransport/src/protocols/rtc/probe_handler.cc')
-rw-r--r-- | libtransport/src/protocols/rtc/probe_handler.cc | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/libtransport/src/protocols/rtc/probe_handler.cc b/libtransport/src/protocols/rtc/probe_handler.cc new file mode 100644 index 000000000..60eceeb19 --- /dev/null +++ b/libtransport/src/protocols/rtc/probe_handler.cc @@ -0,0 +1,141 @@ +/* + * 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. + */ + +#include <glog/logging.h> +#include <hicn/transport/utils/chrono_typedefs.h> +#include <protocols/rtc/probe_handler.h> +#include <protocols/rtc/rtc_consts.h> + +namespace transport { + +namespace protocol { + +namespace rtc { + +ProbeHandler::ProbeHandler(SendProbeCallback &&send_callback, + asio::io_service &io_service) + : probe_interval_(0), + max_probes_(0), + sent_probes_(0), + recv_probes_(0), + probe_timer_(std::make_unique<asio::steady_timer>(io_service)), + rand_eng_((std::random_device())()), + distr_(MIN_RTT_PROBE_SEQ, MAX_RTT_PROBE_SEQ), + send_probe_callback_(std::move(send_callback)) {} + +ProbeHandler::~ProbeHandler() {} + +uint64_t ProbeHandler::getRtt(uint32_t seq, bool is_valid) { + auto it = pending_probes_.find(seq); + + if (it == pending_probes_.end()) return 0; + + if (!is_valid) { + // delete the probe anyway + pending_probes_.erase(it); + valid_batch_ = false; + return 0; + } + + uint64_t now = utils::SteadyTime::nowMs().count(); + uint64_t rtt = now - it->second; + if (rtt < 1) rtt = 1; + + pending_probes_.erase(it); + recv_probes_++; + + return rtt; +} + +double ProbeHandler::getProbeLossRate() { + if (!valid_batch_) return 1.0; + return 1.0 - ((double)recv_probes_ / (double)sent_probes_); +} + +void ProbeHandler::setSuffixRange(uint32_t min, uint32_t max) { + DCHECK(min <= max && min >= MIN_PROBE_SEQ); + distr_ = std::uniform_int_distribution<uint32_t>(min, max); +} + +void ProbeHandler::setProbes(uint32_t probe_interval, uint32_t max_probes) { + stopProbes(); + probe_interval_ = probe_interval; + max_probes_ = max_probes; +} + +void ProbeHandler::stopProbes() { + probe_interval_ = 0; + max_probes_ = 0; + sent_probes_ = 0; + recv_probes_ = 0; + valid_batch_ = true; + probe_timer_->cancel(); +} + +void ProbeHandler::sendProbes() { + if (probe_interval_ == 0) return; + + std::weak_ptr<ProbeHandler> self(shared_from_this()); + probe_timer_->expires_from_now(std::chrono::microseconds(probe_interval_)); + probe_timer_->async_wait([self](const std::error_code &ec) { + if (ec) return; + auto s = self.lock(); + if (s) { + s->generateProbe(); + } + }); +} + +void ProbeHandler::generateProbe() { + if (probe_interval_ == 0) return; + if (max_probes_ != 0 && sent_probes_ >= max_probes_) return; + + uint64_t now = utils::SteadyTime::nowMs().count(); + + uint32_t seq = distr_(rand_eng_); + pending_probes_.insert(std::pair<uint32_t, uint64_t>(seq, now)); + send_probe_callback_(seq); + sent_probes_++; + + // clean up + // a probe may get lost. if the pending_probes_ size becomes bigger than + // MAX_PENDING_PROBES remove all the probes older than a seconds + if (pending_probes_.size() > MAX_PENDING_PROBES) { + for (auto it = pending_probes_.begin(); it != pending_probes_.end();) { + if ((now - it->second) > 1000) + it = pending_probes_.erase(it); + else + it++; + } + } + + sendProbes(); +} + +ProbeType ProbeHandler::getProbeType(uint32_t seq) { + if (MIN_INIT_PROBE_SEQ <= seq && seq <= MAX_INIT_PROBE_SEQ) { + return ProbeType::INIT; + } + if (MIN_RTT_PROBE_SEQ <= seq && seq <= MAX_RTT_PROBE_SEQ) { + return ProbeType::RTT; + } + return ProbeType::NOT_PROBE; +} + +} // namespace rtc + +} // namespace protocol + +} // namespace transport |