/**
* emits an event from {@link SocketIO} to the {@link IOTransport}.
*
* @param socket the socket
* @param event the event
* @param ack acknowledge package which can be called from the server
* @param args the arguments to be send
*/
public void emit(SocketIO socket, String event, IOAcknowledge ack, Object... args) {
String jsonString = null;
try {
Map<String, Object> map = new HashMap<String, Object>();
map.put("name", event);
map.put("args", args);
jsonString = objectMapper.writeValueAsString(map);
IOMessage message = new IOMessage(IOMessage.TYPE_EVENT, socket.getNamespace(), jsonString);
synthesizeAck(message, ack);
sendPlain(message.toString());
} catch (Exception e) {
error(
new SocketIOException(
"Error while emitting an event. Make sure you only try to send arguments, which can be serialized into JSON."));
}
}
/** Connect transport */
private void connectTransport() {
if (getState() == STATE_INVALID) {
return;
}
setState(STATE_CONNECTING);
if (protocols.contains(WebSocketTransport.TRANSPORT_NAME)) {
transport =
WebSocketTransport.create(this.url.getProtocol() + "://" + this.url.getAuthority(), this);
} else if (protocols.contains(XhrTransport.TRANSPORT_NAME)) {
transport =
XhrTransport.create(this.url.getProtocol() + "://" + this.url.getAuthority(), this);
} else {
error(
new SocketIOException(
"Server supports no available transports. You should reconfigure the server to support a available transport"));
return;
}
transport.connect();
}
/**
* {@link IOTransport} should call this function if it does not support framing. If it does,
* transportMessage should be used
*
* @param text the text
*/
public void transportData(String text) {
if (!text.startsWith(FRAME_DELIMITER)) {
transportMessage(text);
return;
}
Iterator<String> fragments = Arrays.asList(text.split(FRAME_DELIMITER)).listIterator(1);
while (fragments.hasNext()) {
int length = Integer.parseInt(fragments.next());
String string = fragments.next();
// Potential BUG: it is not defined if length is in bytes or
// characters. Assuming characters.
if (length != string.length()) {
error(new SocketIOException("Garbage from server: " + text));
return;
}
transportMessage(string);
}
}
/** Handshake. */
private void handshake() {
URL url;
String response;
URLConnection connection;
try {
setState(STATE_HANDSHAKE);
url =
new URL(
this.url.getProtocol()
+ "://"
+ this.url.getAuthority()
+ SOCKET_IO_1
+ (this.url.getQuery() == null ? "" : "?" + this.url.getQuery()));
connection = url.openConnection();
if (connection instanceof HttpsURLConnection) {
((HttpsURLConnection) connection).setSSLSocketFactory(sslSocketFactory);
}
connection.setConnectTimeout(connectTimeout);
connection.setReadTimeout(connectTimeout);
/* Setting the request headers */
for (Entry<Object, Object> entry : headers.entrySet()) {
connection.setRequestProperty((String) entry.getKey(), (String) entry.getValue());
}
log.debug("> " + connection.toString());
InputStream stream = connection.getInputStream();
Scanner in = new Scanner(stream);
response = in.nextLine();
log.debug("< " + response);
String[] data = response.split(":");
sessionId = data[0];
heartbeatTimeout = Long.parseLong(data[1]) * 1000;
closingTimeout = Long.parseLong(data[2]) * 1000;
protocols = Arrays.asList(data[3].split(","));
} catch (Exception e) {
error(new SocketIOException("Error while handshaking", e));
}
}
/**
* Transport message. {@link IOTransport} calls this, when a message has been received.
*
* @param text the text
*/
public void transportMessage(String text) {
log.debug("< " + text);
IOMessage message;
try {
message = new IOMessage(text);
} catch (Exception e) {
error(new SocketIOException("Garbage from server: " + text, e));
return;
}
resetTimeout();
switch (message.getType()) {
case IOMessage.TYPE_DISCONNECT:
try {
findCallback(message).onDisconnect();
} catch (Exception e) {
error(new SocketIOException("Exception was thrown in onDisconnect()", e));
}
break;
case IOMessage.TYPE_CONNECT:
try {
if (firstSocket != null && "".equals(message.getEndpoint())) {
if (firstSocket.getNamespace().equals("")) {
firstSocket.getCallback().onConnect();
} else {
IOMessage connect =
new IOMessage(IOMessage.TYPE_CONNECT, firstSocket.getNamespace(), "");
sendPlain(connect.toString());
}
} else {
findCallback(message).onConnect();
}
firstSocket = null;
} catch (Exception e) {
error(new SocketIOException("Exception was thrown in onConnect()", e));
}
break;
case IOMessage.TYPE_HEARTBEAT:
sendPlain("2::");
break;
case IOMessage.TYPE_MESSAGE:
try {
findCallback(message).onMessage(message.getData(), remoteAcknowledge(message));
} catch (Exception e) {
error(
new SocketIOException(
"Exception was thrown in onMessage(String).\n"
+ "Message was: "
+ message.toString(),
e));
}
break;
case IOMessage.TYPE_JSON_MESSAGE:
try {
// test if JSON is valid by catching a parse Exception
objectMapper.readValue(message.getData(), new TypeReference<Map<String, Object>>() {});
// JSONUtils.getJsonGenericMap(message.getData(), objectMapper);
findCallback(message).onMessage(message.getData(), remoteAcknowledge(message));
} catch (JsonParseException e) {
log.warn("Malformated JSON received: " + message.getData());
} catch (Exception e) {
error(
new SocketIOException(
"Exception was thrown in onMessage(JSON).\n"
+ "Message was: "
+ message.toString(),
e));
}
break;
case IOMessage.TYPE_EVENT:
try {
Map<String, Object> map =
objectMapper.readValue(
message.getData(), new TypeReference<Map<String, Object>>() {});
Object[] argsArray;
if (map.containsKey("args")) {
Object argsString = map.get("args");
List<Object> argObjects =
objectMapper.readValue(argsString.toString(), new TypeReference<List<Object>>() {});
argsArray = new Object[argObjects.size()];
for (int i = 0; i < argObjects.size(); i++) {
if (argObjects.get(i) != null) {
argsArray[i] = argObjects.get(i);
}
}
} else {
argsArray = new Object[0];
}
String eventName = map.get("name").toString();
try {
findCallback(message).on(eventName, remoteAcknowledge(message), argsArray);
} catch (Exception e) {
error(
new SocketIOException(
"Exception was thrown in on(String, JSON[]).\n"
+ "Message was: "
+ message.toString(),
e));
}
} catch (JsonParseException e) {
log.warn("Malformated JSON received: " + message.getData());
} catch (JsonMappingException e) {
log.warn("Mapping JSON received: " + message.getData());
} catch (IOException e) {
log.warn("IO Exception: " + message.getData());
}
break;
case IOMessage.TYPE_ACK:
String[] data = message.getData().split("\\+", 2);
if (data.length == 2) {
try {
int id = Integer.parseInt(data[0]);
IOAcknowledge ack = acknowledge.get(id);
if (ack == null) {
log.warn("Received unknown ack packet");
} else {
List<Object> argObjects =
objectMapper.readValue(data[1].toString(), new TypeReference<List<Object>>() {});
Object[] argsArray = new Object[argObjects.size()];
for (int i = 0; i < argObjects.size(); i++) {
if (argObjects.get(i) != null) {
argsArray[i] = argObjects.get(i);
}
}
ack.ack(argsArray);
}
} catch (NumberFormatException e) {
log.warn(
"Received malformated Acknowledge! This is potentially filling up the acknowledges!");
} catch (JsonParseException e) {
log.warn("Malformated JSON received: " + message.getData());
} catch (JsonMappingException e) {
log.warn("Mapping JSON received: " + message.getData());
} catch (IOException e) {
log.warn("IO Exception: " + message.getData());
}
} else if (data.length == 1) {
sendPlain("6:::" + data[0]);
}
break;
case IOMessage.TYPE_ERROR:
try {
findCallback(message).onError(new SocketIOException(message.getData()));
} catch (SocketIOException e) {
error(e);
}
if (message.getData().endsWith("+0")) {
// We are advised to disconnect
cleanup();
}
break;
case IOMessage.TYPE_NOOP:
break;
default:
log.warn("Unkown type received" + message.getType());
break;
}
}
