1 files changed, 137 insertions, 0 deletions
diff --git a/Websocket/tcp-server.cpp b/Websocket/tcp-server.cpp
new file mode 100644
index 00000000..4eb5d29d
--- /dev/null
+++ b/Websocket/tcp-server.cpp
@@ -0,0 +1,137 @@
+/*
+ * Copyright (c) 2017 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 "tcp-server.h"
+
+TcpServer::TcpServer(unsigned short port, long read_timeout)
+        : port(port)
+        , acceptor(io_service)
+        , read_timeout(read_timeout)
+{}
+
+TcpServer::~TcpServer()
+{}
+
+void
+TcpServer::setHandler(const HandlerFunction &handler)
+{
+  this->handler = handler;
+}
+
+void
+TcpServer::start()
+{
+  if (io_service.stopped())
+    io_service.reset();
+
+  boost::asio::ip::tcp::endpoint endpoint;
+  endpoint = boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port);
+
+  acceptor.open(endpoint.protocol());
+  acceptor.set_option(boost::asio::socket_base::reuse_address(true));
+  acceptor.bind(endpoint);
+  acceptor.listen();
+
+  accept();
+
+  //Set interrupt callbacks
+
+  boost::asio::io_service io_service;
+  boost::asio::signal_set signals(io_service, SIGINT, SIGQUIT);
+
+  signals.async_wait([this] (const boost::system::error_code &errorCode, int) {
+    std::cout << "Gracefully terminating tcp server" << std::endl;
+    this->io_service.reset();
+    this->acceptor.cancel();
+  });
+
+  io_service.run();
+}
+
+void
+TcpServer::accept()
+{
+  //Create new socket for this connection
+  //Shared_ptr is used to pass temporary objects to the asynchronous functions
+  std::shared_ptr<boost::asio::ip::tcp::socket> socket(new boost::asio::ip::tcp::socket(io_service));
+  acceptor.async_accept(*socket, [this, socket](const boost::system::error_code &ec) {
+    accept();
+
+    if (ec) {
+      if (ec == boost::asio::error::operation_aborted) // when the socket is closed by someone
+        return;
+    }
+
+    processIncomingData(socket);
+  });
+}
+
+void
+TcpServer::processIncomingData(std::shared_ptr<boost::asio::ip::tcp::socket> socket)
+{
+  // Set timeout on the following boost::asio::async-read or write function
+  std::shared_ptr<boost::asio::deadline_timer> timer;
+  if (read_timeout > 0)
+    timer = set_timeout_on_socket(socket, read_timeout);
+
+  std::shared_ptr<boost::asio::streambuf> buffer(new boost::asio::streambuf());
+
+  boost::asio::async_read_until(*socket, *buffer, "\r\n\r\n",
+                                [this, timer, buffer, socket](const boost::system::error_code& error, std::size_t bytes_transferred) {
+    if (read_timeout > 0)
+      timer->cancel();
+
+    if (error) {
+      std::cerr << "Boost error code is not null! ERROR: " << error << std::endl;
+      return;
+    }
+
+    std::size_t bufferSize = buffer->size();
+    buffer->commit(buffer->size());
+    const uint8_t *data = boost::asio::buffer_cast<const uint8_t *>(buffer->data());
+
+    std::string reply = handler(data, bufferSize);
+
+    if (reply != "") {
+
+      boost::asio::async_write(*socket, boost::asio::buffer(reply.c_str(), reply.size()), [this]
+      (boost::system::error_code ec, std::size_t /*length*/)
+      {
+        if (!ec) {
+          std::cout << "Reply sent!" << std::endl;
+        } else {
+          std::cerr << "ERROR! Reply not sent." << std::endl;
+        }
+      });
+
+    }
+  });
+
+}
+
+std::shared_ptr<boost::asio::deadline_timer>
+TcpServer::set_timeout_on_socket(std::shared_ptr<boost::asio::ip::tcp::socket> socket, long seconds)
+{
+  std::shared_ptr<boost::asio::deadline_timer> timer(new boost::asio::deadline_timer(io_service));
+  timer->expires_from_now(boost::posix_time::seconds(seconds));
+  timer->async_wait([socket](const boost::system::error_code &ec) {
+    if (!ec) {
+      boost::system::error_code ec;
+      std::cout << "Connection timeout!" << std::endl;
+      socket->lowest_layer().shutdown(boost::asio::ip::tcp::socket::shutdown_both, ec);
+      socket->lowest_layer().close();
+    }
+  });
+  return timer;
+}