1 files changed, 151 insertions, 0 deletions
diff --git a/libtransport/src/protocols/rtc/rtc.h b/libtransport/src/protocols/rtc/rtc.h
new file mode 100644
index 000000000..a8a474216
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+++ b/libtransport/src/protocols/rtc/rtc.h
@@ -0,0 +1,151 @@
+/*
+ * 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 <protocols/rtc/rtc_forwarding_strategy.h>
+#include <protocols/rtc/rtc_ldr.h>
+#include <protocols/rtc/rtc_rc.h>
+#include <protocols/rtc/rtc_reassembly.h>
+#include <protocols/rtc/rtc_state.h>
+#include <protocols/rtc/rtc_verifier.h>
+#include <protocols/transport_protocol.h>
+
+#include <unordered_set>
+#include <vector>
+
+namespace transport {
+
+namespace protocol {
+
+namespace rtc {
+
+class RTCTransportProtocol : public TransportProtocol {
+ public:
+  RTCTransportProtocol(implementation::ConsumerSocket *icnet_socket);
+
+  ~RTCTransportProtocol();
+
+  using TransportProtocol::start;
+
+  using TransportProtocol::stop;
+
+  void resume() override;
+
+  std::size_t transportHeaderLength(bool isFEC) override;
+
+  auto shared_from_this() { return utils::shared_from(this); }
+
+ private:
+  enum class SyncState { catch_up = 0, in_sync = 1, last };
+
+ private:
+  // setup functions
+  void initParams();
+  void reset() override;
+
+  void inactiveProducer();
+
+  // protocol functions
+  void discoveredRtt();
+  void newRound();
+
+  // window functions
+  void computeMaxSyncWindow();
+  void updateSyncWindow();
+
+  // packet functions
+  void sendRtxInterest(uint32_t seq);
+  void sendProbeInterest(uint32_t seq);
+  void sendInterestForTimeout(uint32_t seq);
+  void scheduleNextInterests() override;
+  void onInterestTimeout(Interest::Ptr &interest, const Name &name) override;
+  void onNack(const ContentObject &content_object);
+  void onProbe(const ContentObject &content_object);
+  void onContentObjectReceived(Interest &interest,
+                               ContentObject &content_object,
+                               std::error_code &ec) override;
+  void onPacketDropped(Interest &interest, ContentObject &content_object,
+                       const std::error_code &reason) override {}
+  void onReassemblyFailed(std::uint32_t missing_segment) override {}
+  void processManifest(Interest &interest, ContentObject &manifest);
+
+  // interaction with app functions
+  void sendStatsToApp(uint32_t retx_count, uint32_t received_bytes,
+                      uint32_t sent_interests, uint32_t lost_data,
+                      uint32_t definitely_lost, uint32_t recovered_losses,
+                      uint32_t received_nacks, uint32_t received_fec);
+
+  // FEC functions
+  // send the received content object to the decoder
+  void decodePacket(ContentObject &content_object, bool is_manifest);
+  void onFecPackets(fec::BufferArray &packets);
+
+  // Utils
+  ContentObject::Ptr removeFecHeader(const ContentObject &content_object);
+  ContentObject::Ptr toContentObject(const Name &name, Packet::Format format,
+                                     PayloadType payload_type,
+                                     const uint8_t *payload,
+                                     std::size_t payload_size,
+                                     std::size_t additional_header_size = 0);
+
+  // protocol state
+  bool start_send_interest_;
+  SyncState current_state_;
+
+  // cwin vars
+  uint32_t current_sync_win_;
+  uint32_t max_sync_win_;
+
+  // round timer
+  std::unique_ptr<asio::steady_timer> round_timer_;
+
+  // scheduler timer (postpone interest sending to explot aggregated interests)
+  std::unique_ptr<asio::steady_timer> scheduler_timer_;
+  bool scheduler_timer_on_;
+  uint64_t last_interest_sent_time_;
+  uint64_t last_interest_sent_seq_;
+
+  // maximum aggregated interest. if the transport is connected to the forwarder
+  // we cannot use aggregated interests
+  uint32_t max_aggregated_interest_;
+  // maximum number of intereset that can be sent in a loop to avoid packets
+  // dropped by the kernel
+  uint32_t max_sent_int_;
+
+  // pacing timer (do not send too many interests in a short time to avoid
+  // packet drops in the kernel)
+  std::unique_ptr<asio::steady_timer> pacing_timer_;
+  bool pacing_timer_on_;
+
+  // timeouts
+  std::unordered_set<uint32_t> timeouts_or_nacks_;
+
+  std::shared_ptr<RTCState> state_;
+  std::shared_ptr<RTCRateControl> rc_;
+  std::shared_ptr<RTCLossDetectionAndRecovery> ldr_;
+  std::shared_ptr<RTCVerifier> verifier_;
+
+  // forwarding strategy selection
+  RTCForwardingStrategy fwd_strategy_;
+
+  uint32_t number_;
+};
+
+}  // namespace rtc
+
+}  // namespace protocol
+
+}  // namespace transport