1 files changed, 109 insertions, 0 deletions
diff --git a/libtransport/src/core/connector.h b/libtransport/src/core/connector.h
new file mode 100644
index 000000000..f2bbe5dcd
--- /dev/null
+++ b/libtransport/src/core/connector.h
@@ -0,0 +1,109 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+#include <hicn/transport/core/packet.h>
+#include <hicn/transport/utils/membuf.h>
+#include <hicn/transport/utils/object_pool.h>
+#include <hicn/transport/utils/ring_buffer.h>
+
+#include <deque>
+#include <functional>
+
+namespace transport {
+
+namespace core {
+
+enum class ConnectorType : uint8_t {
+  SOCKET_CONNECTOR,
+  RAW_SOCKET_CONNECTOR,
+  VPP_CONNECTOR,
+};
+
+class Connector {
+ protected:
+  enum class ConnectorState {
+    CLOSED,
+    CONNECTING,
+    CONNECTED,
+  };
+
+ public:
+  static constexpr std::size_t packet_size = 2048;
+  static constexpr std::size_t queue_size = 4096;
+  static constexpr std::size_t packet_pool_size = 4096;
+
+  using PacketRing = utils::CircularFifo<Packet::MemBufPtr, queue_size>;
+  using PacketQueue = std::deque<Packet::MemBufPtr>;
+  using PacketReceivedCallback = std::function<void(Packet::MemBufPtr &&)>;
+  using OnReconnect = std::function<void()>;
+  using PacketSentCallback = std::function<void()>;
+
+  Connector(PacketReceivedCallback &&receive_callback,
+            OnReconnect &&reconnect_callback);
+
+  virtual ~Connector(){};
+
+  virtual void send(const Packet::MemBufPtr &packet) = 0;
+
+  virtual void send(const uint8_t *packet, std::size_t len,
+                    const PacketSentCallback &packet_sent = 0) = 0;
+
+  virtual void close() = 0;
+
+  virtual ConnectorState state() { return state_; };
+
+  virtual bool isConnected() { return state_ == ConnectorState::CONNECTED; }
+
+ protected:
+  void increasePoolSize(std::size_t size = packet_pool_size);
+
+  TRANSPORT_ALWAYS_INLINE utils::ObjectPool<utils::MemBuf>::Ptr getPacket() {
+    auto result = packet_pool_.get();
+
+    while (TRANSPORT_EXPECT_FALSE(!result.first)) {
+      // Add packets to the pool
+      increasePoolSize();
+      result = packet_pool_.get();
+    }
+
+    if (result.second->isChained()) {
+      result.second->separateChain(result.second->next(),
+                                   result.second->prev());
+    }
+
+    result.second->trimEnd(result.second->length());
+    return std::move(result.second);
+  }
+
+ private:
+  void init();
+
+ protected:
+  static std::once_flag init_flag_;
+  utils::ObjectPool<utils::MemBuf> packet_pool_;
+  PacketQueue output_buffer_;
+
+  // Connector events
+  PacketReceivedCallback receive_callback_;
+  OnReconnect on_reconnect_callback_;
+
+  // Connector state
+  ConnectorState state_;
+};
+}  // end namespace core
+
+}  // end namespace transport