websocket-channel.cpp

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
#include "websocket-channel.hpp"
#include "generic-link-service.hpp"
#include "websocket-transport.hpp"
#include "core/global-io.hpp"

namespace nfd {
namespace face {

NFD_LOG_INIT("WebSocketChannel");

WebSocketChannel::WebSocketChannel(const websocket::Endpoint& localEndpoint)
  : m_localEndpoint(localEndpoint)
  , m_pingInterval(time::seconds(10))
{
  setUri(FaceUri(m_localEndpoint, "ws"));
  NFD_LOG_CHAN_INFO("Creating channel");

  // Be quiet
  m_server.clear_access_channels(websocketpp::log::alevel::all);
  m_server.clear_error_channels(websocketpp::log::elevel::all);

  // Setup WebSocket server
  m_server.init_asio(&getGlobalIoService());
  m_server.set_open_handler(bind(&WebSocketChannel::handleOpen, this, _1));
  m_server.set_close_handler(bind(&WebSocketChannel::handleClose, this, _1));
  m_server.set_message_handler(bind(&WebSocketChannel::handleMessage, this, _1, _2));

  // Detect disconnections using ping-pong messages
  m_server.set_pong_handler(bind(&WebSocketChannel::handlePong, this, _1));
  m_server.set_pong_timeout_handler(bind(&WebSocketChannel::handlePongTimeout, this, _1));

  // Always set SO_REUSEADDR flag
  m_server.set_reuse_addr(true);
}

void
WebSocketChannel::setPingInterval(time::milliseconds interval)
{
  BOOST_ASSERT(!m_server.is_listening());

  m_pingInterval = interval;
}

void
WebSocketChannel::setPongTimeout(time::milliseconds timeout)
{
  BOOST_ASSERT(!m_server.is_listening());

  m_server.set_pong_timeout(static_cast<long>(timeout.count()));
}

void
WebSocketChannel::handlePongTimeout(websocketpp::connection_hdl hdl)
{
  auto it = m_channelFaces.find(hdl);
  if (it != m_channelFaces.end()) {
    static_cast<WebSocketTransport*>(it->second->getTransport())->handlePongTimeout();
  }
  else {
    NFD_LOG_CHAN_WARN("Pong timeout on unknown transport");
  }
}

void
WebSocketChannel::handlePong(websocketpp::connection_hdl hdl)
{
  auto it = m_channelFaces.find(hdl);
  if (it != m_channelFaces.end()) {
    static_cast<WebSocketTransport*>(it->second->getTransport())->handlePong();
  }
  else {
    NFD_LOG_CHAN_WARN("Pong received on unknown transport");
  }
}

void
WebSocketChannel::handleMessage(websocketpp::connection_hdl hdl,
                                websocket::Server::message_ptr msg)
{
  auto it = m_channelFaces.find(hdl);
  if (it != m_channelFaces.end()) {
    static_cast<WebSocketTransport*>(it->second->getTransport())->receiveMessage(msg->get_payload());
  }
  else {
    NFD_LOG_CHAN_WARN("Message received on unknown transport");
  }
}

void
WebSocketChannel::handleOpen(websocketpp::connection_hdl hdl)
{
  NFD_LOG_CHAN_TRACE("Incoming connection from " << m_server.get_con_from_hdl(hdl)->get_remote_endpoint());

  auto linkService = make_unique<GenericLinkService>();
  auto transport = make_unique<WebSocketTransport>(hdl, ref(m_server), m_pingInterval);
  auto face = make_shared<Face>(std::move(linkService), std::move(transport));

  BOOST_ASSERT(m_channelFaces.count(hdl) == 0);
  m_channelFaces[hdl] = face;
  connectFaceClosedSignal(*face, [this, hdl] { m_channelFaces.erase(hdl); });

  m_onFaceCreatedCallback(face);
}

void
WebSocketChannel::handleClose(websocketpp::connection_hdl hdl)
{
  auto it = m_channelFaces.find(hdl);
  if (it != m_channelFaces.end()) {
    it->second->close();
  }
  else {
    NFD_LOG_CHAN_WARN("Close on unknown transport");
  }
}

void
WebSocketChannel::listen(const FaceCreatedCallback& onFaceCreated)
{
  if (isListening()) {
    NFD_LOG_CHAN_WARN("Already listening");
    return;
  }

  m_onFaceCreatedCallback = onFaceCreated;

  m_server.listen(m_localEndpoint);
  m_server.start_accept();
  NFD_LOG_CHAN_DEBUG("Started listening");
}

} // namespace face
} // namespace nfd