1 files changed, 158 insertions, 0 deletions
diff --git a/libtransport/src/protocols/raaqm_data_path.cc b/libtransport/src/protocols/raaqm_data_path.cc
new file mode 100644
index 000000000..439549c85
--- /dev/null
+++ b/libtransport/src/protocols/raaqm_data_path.cc
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2017-2019 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 <hicn/transport/utils/chrono_typedefs.h>
+
+#include <protocols/raaqm_data_path.h>
+
+namespace transport {
+
+namespace protocol {
+
+RaaqmDataPath::RaaqmDataPath(double drop_factor,
+                             double minimum_drop_probability,
+                             unsigned new_timer, unsigned int samples,
+                             uint64_t new_rtt, uint64_t new_rtt_min,
+                             uint64_t new_rtt_max, unsigned new_pd)
+
+    : drop_factor_(drop_factor),
+      minimum_drop_probability_(minimum_drop_probability),
+      timer_(new_timer),
+      samples_(samples),
+      rtt_(new_rtt),
+      rtt_min_(new_rtt_min),
+      rtt_max_(new_rtt_max),
+      prop_delay_(new_pd),
+      new_prop_delay_(false),
+      drop_prob_(0),
+      packets_received_(0),
+      last_packets_received_(0),
+      m_packets_bytes_received_(0),
+      last_packets_bytes_received_(0),
+      raw_data_bytes_received_(0),
+      last_raw_data_bytes_received_(0),
+      rtt_samples_(samples_),
+      last_received_pkt_(utils::SteadyClock::now()),
+      average_rtt_(0),
+      alpha_(ALPHA) {}
+
+RaaqmDataPath &RaaqmDataPath::insertNewRtt(uint64_t new_rtt) {
+  rtt_ = new_rtt;
+  rtt_samples_.pushBack(new_rtt);
+
+  rtt_max_ = rtt_samples_.rBegin();
+  rtt_min_ = rtt_samples_.begin();
+
+  if (rtt_min_ < prop_delay_) {
+    new_prop_delay_ = true;
+    prop_delay_ = rtt_min_;
+  }
+
+  last_received_pkt_ = utils::SteadyClock::now();
+
+  return *this;
+}
+
+RaaqmDataPath &RaaqmDataPath::updateReceivedStats(std::size_t packet_size,
+                                                  std::size_t data_size) {
+  packets_received_++;
+  m_packets_bytes_received_ += packet_size;
+  raw_data_bytes_received_ += data_size;
+
+  return *this;
+}
+
+double RaaqmDataPath::getDropFactor() { return drop_factor_; }
+
+double RaaqmDataPath::getDropProb() { return drop_prob_; }
+
+RaaqmDataPath &RaaqmDataPath::setDropProb(double dropProb) {
+  drop_prob_ = dropProb;
+
+  return *this;
+}
+
+double RaaqmDataPath::getMinimumDropProbability() {
+  return minimum_drop_probability_;
+}
+
+double RaaqmDataPath::getTimer() { return timer_; }
+
+RaaqmDataPath &RaaqmDataPath::smoothTimer() {
+  timer_ = (1 - TIMEOUT_SMOOTHER) * timer_ +
+           (TIMEOUT_SMOOTHER)*rtt_ * (TIMEOUT_RATIO);
+
+  return *this;
+}
+
+double RaaqmDataPath::getRtt() { return (double)rtt_; }
+
+double RaaqmDataPath::getAverageRtt() { return average_rtt_; }
+
+double RaaqmDataPath::getRttMax() { return (double)rtt_max_; }
+
+double RaaqmDataPath::getRttMin() { return (double)rtt_min_; }
+
+unsigned RaaqmDataPath::getSampleValue() { return samples_; }
+
+unsigned RaaqmDataPath::getRttQueueSize() {
+  return static_cast<unsigned>(rtt_samples_.size());
+}
+
+RaaqmDataPath &RaaqmDataPath::updateDropProb() {
+  drop_prob_ = 0.0;
+
+  if (getSampleValue() == getRttQueueSize()) {
+    if (rtt_max_ == rtt_min_) {
+      drop_prob_ = minimum_drop_probability_;
+    } else {
+      drop_prob_ = minimum_drop_probability_ +
+                   drop_factor_ * (rtt_ - rtt_min_) / (rtt_max_ - rtt_min_);
+    }
+  }
+
+  return *this;
+}
+
+void RaaqmDataPath::setAlpha(double alpha) {
+  if (alpha >= 0 && alpha <= 1) {
+    alpha_ = alpha;
+  }
+}
+
+bool RaaqmDataPath::newPropagationDelayAvailable() {
+  bool r = new_prop_delay_;
+  new_prop_delay_ = false;
+  return r;
+}
+
+unsigned int RaaqmDataPath::getPropagationDelay() {
+  return (unsigned int)prop_delay_;
+}
+
+bool RaaqmDataPath::isStale() {
+  utils::TimePoint now = utils::SteadyClock::now();
+  auto time =
+      std::chrono::duration_cast<utils::Microseconds>(now - last_received_pkt_)
+          .count();
+  if (time > 2000000) {
+    return true;
+  }
+  return false;
+}
+
+}  // end namespace protocol
+
+}  // end namespace transport