face: Stop using shared_ptr to manage acceptors

This commit also includes a major cleanup of all channels.

Change-Id: I10db9709e0cba6a0691a86482c60b5dbb2956f68
Refs: #2613
diff --git a/daemon/face/websocket-channel.cpp b/daemon/face/websocket-channel.cpp
index 016dcac..855dd99 100644
--- a/daemon/face/websocket-channel.cpp
+++ b/daemon/face/websocket-channel.cpp
@@ -24,6 +24,8 @@
  */
 
 #include "websocket-channel.hpp"
+#include "core/global-io.hpp"
+#include "core/scheduler.hpp"
 
 #include <boost/date_time/posix_time/posix_time.hpp>
 
@@ -31,13 +33,13 @@
 
 NFD_LOG_INIT("WebSocketChannel");
 
-using namespace boost::asio;
-
 WebSocketChannel::WebSocketChannel(const websocket::Endpoint& localEndpoint)
   : m_localEndpoint(localEndpoint)
   , m_isListening(false)
   , m_pingInterval(10000)
 {
+  setUri(FaceUri(m_localEndpoint, "ws"));
+
   // Setup WebSocket server
   m_server.clear_access_channels(websocketpp::log::alevel::all);
   m_server.clear_error_channels(websocketpp::log::alevel::all);
@@ -46,19 +48,19 @@
   m_server.set_open_handler(bind(&WebSocketChannel::handleOpen, this, _1));
   m_server.set_close_handler(bind(&WebSocketChannel::handleClose, this, _1));
   m_server.init_asio(&getGlobalIoService());
+
+  // Detect disconnections using ping-pong messages
+  m_server.set_pong_handler(bind(&WebSocketChannel::handlePong, this, _1, _2));
+  m_server.set_pong_timeout_handler(bind(&WebSocketChannel::handlePongTimeout, this, _1, _2));
+
   // Always set SO_REUSEADDR flag
   m_server.set_reuse_addr(true);
-
-  // Detect disconnection using PONG message
-  m_server.set_pong_handler(bind(&WebSocketChannel::handlePong, this, _1, _2));
-  m_server.set_pong_timeout_handler(bind(&WebSocketChannel::handlePongTimeout,
-                                         this, _1, _2));
-
-  this->setUri(FaceUri(localEndpoint, "ws"));
 }
 
-WebSocketChannel::~WebSocketChannel()
+void
+WebSocketChannel::setPingInterval(time::milliseconds interval)
 {
+  m_pingInterval = interval;
 }
 
 void
@@ -70,56 +72,53 @@
 void
 WebSocketChannel::handlePongTimeout(websocketpp::connection_hdl hdl, std::string msg)
 {
-  ChannelFaceMap::iterator it = m_channelFaces.find(hdl);
-  if (it != m_channelFaces.end())
-    {
-      it->second->close();
-      NFD_LOG_DEBUG("handlePongTimeout: remove " << it->second->getRemoteUri());
-      m_channelFaces.erase(it);
-    }
+  auto it = m_channelFaces.find(hdl);
+  if (it != m_channelFaces.end()) {
+    NFD_LOG_TRACE(__func__ << ": " << it->second->getRemoteUri());
+    it->second->close();
+    m_channelFaces.erase(it);
+  }
 }
 
 void
 WebSocketChannel::handlePong(websocketpp::connection_hdl hdl, std::string msg)
 {
-  ChannelFaceMap::iterator it = m_channelFaces.find(hdl);
-  if (it != m_channelFaces.end())
-    {
-      NFD_LOG_TRACE("handlePong: from " << it->second->getRemoteUri());
-    }
+  auto it = m_channelFaces.find(hdl);
+  if (it != m_channelFaces.end()) {
+    NFD_LOG_TRACE("Pong from " << it->second->getRemoteUri());
+  }
 }
 
 void
 WebSocketChannel::handleMessage(websocketpp::connection_hdl hdl,
                                 websocket::Server::message_ptr msg)
 {
-  ChannelFaceMap::iterator it = m_channelFaces.find(hdl);
-  if (it != m_channelFaces.end())
-    {
-      it->second->handleReceive(msg->get_payload());
-    }
+  auto it = m_channelFaces.find(hdl);
+  if (it != m_channelFaces.end()) {
+    it->second->handleReceive(msg->get_payload());
+  }
 }
 
 void
 WebSocketChannel::handleOpen(websocketpp::connection_hdl hdl)
 {
   std::string remote;
-  try
-    {
-      remote = "wsclient://" + m_server.get_con_from_hdl(hdl)->get_remote_endpoint();
-    }
-  catch (websocketpp::lib::error_code&)
-    {
-      NFD_LOG_DEBUG("handleOpen: cannot get remote uri");
-      websocketpp::lib::error_code ecode;
-      m_server.close(hdl, websocketpp::close::status::normal, "closed by channel", ecode);
-    }
-  shared_ptr<WebSocketFace> face = ndn::make_shared<WebSocketFace>(FaceUri(remote), this->getUri(),
-                                                                   hdl, ref(m_server));
+  try {
+    remote = "wsclient://" + m_server.get_con_from_hdl(hdl)->get_remote_endpoint();
+  }
+  catch (const websocketpp::lib::error_code& e) {
+    NFD_LOG_WARN("Cannot get remote URI");
+    websocketpp::lib::error_code error;
+    m_server.close(hdl, websocketpp::close::status::normal, "closed by channel", error);
+    return;
+  }
+
+  auto face = make_shared<WebSocketFace>(FaceUri(remote), this->getUri(),
+                                         hdl, ref(m_server));
   m_onFaceCreatedCallback(face);
   m_channelFaces[hdl] = face;
 
-  // Schedule PING message
+  // Schedule ping message
   scheduler::EventId pingEvent = scheduler::schedule(m_pingInterval,
                                                      bind(&WebSocketChannel::sendPing, this, hdl));
   face->setPingEventId(pingEvent);
@@ -128,62 +127,49 @@
 void
 WebSocketChannel::sendPing(websocketpp::connection_hdl hdl)
 {
-  ChannelFaceMap::iterator it = m_channelFaces.find(hdl);
-  if (it != m_channelFaces.end())
-    {
-      try
-        {
-          m_server.ping(hdl, "NFD-WebSocket");
-        }
-      catch (websocketpp::lib::error_code&)
-        {
-          it->second->close();
-          NFD_LOG_DEBUG("sendPing: failed to ping " << it->second->getRemoteUri());
-          m_channelFaces.erase(it);
-        }
+  auto it = m_channelFaces.find(hdl);
+  if (it != m_channelFaces.end()) {
+    NFD_LOG_TRACE("Sending ping to " << it->second->getRemoteUri());
 
-      NFD_LOG_TRACE("sendPing: to " << it->second->getRemoteUri());
-
-      // Schedule next PING message
-      scheduler::EventId pingEvent = scheduler::schedule(m_pingInterval,
-                                         bind(&WebSocketChannel::sendPing, this, hdl));
-      it->second->setPingEventId(pingEvent);
+    try {
+      m_server.ping(hdl, "NFD-WebSocket");
     }
+    catch (const websocketpp::lib::error_code& e) {
+      NFD_LOG_WARN("Failed to ping " << it->second->getRemoteUri());
+      it->second->close();
+      m_channelFaces.erase(it);
+      return;
+    }
+
+    // Schedule next ping message
+    scheduler::EventId pingEvent = scheduler::schedule(m_pingInterval,
+                                                       bind(&WebSocketChannel::sendPing, this, hdl));
+    it->second->setPingEventId(pingEvent);
+  }
 }
 
 void
 WebSocketChannel::handleClose(websocketpp::connection_hdl hdl)
 {
-  ChannelFaceMap::iterator it = m_channelFaces.find(hdl);
-  if (it != m_channelFaces.end())
-    {
-      it->second->close();
-      NFD_LOG_DEBUG("handleClose: remove " << it->second->getRemoteUri());
-      m_channelFaces.erase(it);
-    }
+  auto it = m_channelFaces.find(hdl);
+  if (it != m_channelFaces.end()) {
+    NFD_LOG_TRACE(__func__ << ": " << it->second->getRemoteUri());
+    it->second->close();
+    m_channelFaces.erase(it);
+  }
 }
 
-
 void
 WebSocketChannel::listen(const FaceCreatedCallback& onFaceCreated)
 {
-  if (m_isListening)
-    {
-      throw Error("Listen already called on this channel");
-    }
+  if (isListening()) {
+    NFD_LOG_WARN("[" << m_localEndpoint << "] Already listening");
+    return;
+  }
   m_isListening = true;
 
   m_onFaceCreatedCallback = onFaceCreated;
-
-  try
-    {
-      m_server.listen(m_localEndpoint);
-    }
-  catch (websocketpp::lib::error_code ec)
-    {
-      throw Error("Failed to listen on local endpoint");
-    }
-
+  m_server.listen(m_localEndpoint);
   m_server.start_accept();
 }