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-rw-r--r--libtransport/src/protocols/rtc/probe_handler.h75
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diff --git a/libtransport/src/protocols/rtc/probe_handler.h b/libtransport/src/protocols/rtc/probe_handler.h
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+/*
+ * Copyright (c) 2017-2021 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 <asio.hpp>
+#include <asio/steady_timer.hpp>
+#include <functional>
+#include <random>
+#include <unordered_map>
+
+namespace transport {
+
+namespace protocol {
+
+namespace rtc {
+
+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 valaid
+ uint64_t getRtt(uint32_t seq);
+
+ // reset the probes parameters. it stop the current probing.
+ // to restar call sendProbes.
+ // 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);
+
+ // stop to schedule probes
+ void stopProbes();
+
+ void sendProbes();
+
+ private:
+ uint32_t probe_interval_; // us
+ uint32_t max_probes_; // packets
+ uint32_t sent_probes_; // packets
+
+ std::unique_ptr<asio::steady_timer> probe_timer_;
+
+ // map from seqnumber 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