org.jooby.WebSocket Maven / Gradle / Ivy
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package org.jooby;
import static java.util.Objects.requireNonNull;
import java.io.Closeable;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import org.jooby.internal.RouteMatcher;
import org.jooby.internal.RoutePattern;
import org.jooby.internal.WebSocketImpl;
import org.slf4j.LoggerFactory;
import com.google.common.base.Preconditions;
import com.google.inject.Key;
import com.google.inject.TypeLiteral;
/**
* WebSockets
*
* Creating web sockets is pretty straightforward:
*
*
*
* {
* ws("/", (ws) {@literal ->} {
* // connected
* ws.onMessage(message {@literal ->} {
* System.out.println(message.value());
* ws.send("Message Received");
* });
* ws.send("Connected");
* });
* }
*
*
* First thing you need to do is to register a new web socket in your App using the
* {@link Jooby#ws(String, WebSocket.OnOpen1)} method.
* You can specify a path to listen for web socket connection. The path can be a static path or
* a path pattern (like routes).
*
* On new connections the {@link WebSocket.OnOpen1#onOpen(WebSocket)} will be executed from there
* you can listen using the {@link #onMessage(OnMessage)}, {@link #onClose(OnClose)} or
* {@link #onError(OnError)} events.
*
* Inside a handler you can send text or binary message.
*
* mvc
*
* Starting from 1.1.0 is it possible to use a class as web socket listener (in
* addition to the script web sockets supported). Your class must implement
* {@link WebSocket#onMessage(OnMessage)}, like:
*
*
* {@code
* @Path("/ws")
* class MyHandler implements WebSocket.OnMessage {
*
* private WebSocket ws;
*
* @Inject
* public MyHandler(WebSocket ws) {
* this.ws = ws;
* }
*
* @Override
* public void onMessage(String message) {
* ws.send("Got it!");
* }
* }
*
* {
* ws(MyHandler.class);
* }
*
* }
*
*
* Optionally, your listener might implements the
* {@link WebSocket.OnClose},
* {@link WebSocket.OnError} or {@link WebSocket.OnOpen} callbacks. Or if you want to
* implement all them, then just {@link WebSocket.Handler}
*
*
* data types
*
* If your web socket is suppose to send/received a specific data type, like:
* json it is nice to define a consume and produce types:
*
*
*
* ws("/", (ws) {@literal ->} {
* ws.onMessage(message {@literal ->} {
* // read as json
* MyObject object = message.to(MyObject.class);
* });
*
* MyObject object = new MyObject();
* ws.send(object); // convert to text message using a json converter
* })
* .consumes(MediaType.json)
* .produces(MediaType.json);
*
*
*
* Or via annotations for mvc listeners:
*
*
* {@code
*
* @Consumes("json")
* @Produces("json")
* @Path("/ws")
* class MyHandler implements WebSocket.OnMessage {
*
* public void onMessage(MyObject message) {
* // ...
* ws.send(new ResponseObject());
* }
*
* }
* }
*
*
* The message MyObject will be processed by a json parser and the
* response object will be renderered as json too.
*
*
* @author edgar
* @since 0.1.0
*/
public interface WebSocket extends Closeable, Registry {
/** Websocket key. */
Key> KEY = Key.get(new TypeLiteral>() {
});
/**
* A web socket connect handler. Executed every time a new client connect to the socket.
*
* @author edgar
* @since 0.1.0
*/
interface OnOpen {
/**
* Inside a connect event, you can listen for {@link WebSocket#onMessage(OnMessage)},
* {@link WebSocket#onClose(OnClose)} or {@link WebSocket#onError(OnError)} events.
*
* Also, you can send text and binary message.
*
* @param req Current request.
* @param ws A web socket.
* @throws Exception If something goes wrong while connecting.
*/
void onOpen(Request req, WebSocket ws) throws Exception;
}
/**
* A web socket connect handler. Executed every time a new client connect to the socket.
*
* @author edgar
* @since 0.1.0
*/
interface OnOpen1 extends OnOpen {
@Override
default void onOpen(final Request req, final WebSocket ws) throws Exception {
onOpen(ws);
}
/**
* Inside a connect event, you can listen for {@link WebSocket#onMessage(OnMessage)},
* {@link WebSocket#onClose(OnClose)} or {@link WebSocket#onError(OnError)} events.
*
* Also, you can send text and binary message.
*
* @param ws A web socket.
* @throws Exception If something goes wrong while connecting.
*/
void onOpen(WebSocket ws) throws Exception;
}
/**
* Hold a status code and optionally a reason message for {@link WebSocket#close()} operations.
*
* @author edgar
* @since 0.1.0
*/
class CloseStatus {
/** A status code. */
private final int code;
/** A close reason. */
private final String reason;
/**
* Create a new {@link CloseStatus} instance.
*
* @param code the status code
*/
private CloseStatus(final int code) {
this(code, null);
}
/**
* Create a new {@link CloseStatus} instance.
*
* @param code the status code
* @param reason the reason
*/
private CloseStatus(final int code, final String reason) {
Preconditions.checkArgument((code >= 1000 && code < 5000), "Invalid code: %s", code);
this.code = code;
this.reason = reason == null || reason.isEmpty() ? null : reason;
}
/**
* Creates a new {@link CloseStatus}.
*
* @param code A status code.
* @return A new close status.
*/
public static CloseStatus of(final int code) {
return new CloseStatus(code);
}
/**
* Creates a new {@link CloseStatus}.
*
* @param code A status code.
* @param reason A close reason.
* @return A new close status.
*/
public static CloseStatus of(final int code, final String reason) {
requireNonNull(reason, "A reason is required.");
return new CloseStatus(code, reason);
}
/**
* @return the status code.
*/
public int code() {
return this.code;
}
/**
* @return the reason or {@code null}.
*/
public String reason() {
return this.reason;
}
@Override
public String toString() {
if (reason == null) {
return code + "";
}
return code + " (" + reason + ")";
}
}
/**
* Web socket message callback.
*
* @author edgar
* @since 0.1.0
* @param Param type.
*/
interface OnMessage {
/**
* Invoked from a web socket.
*
* @param message Client message.
* @throws Exception If something goes wrong.
*/
void onMessage(T message) throws Exception;
}
interface OnClose {
void onClose(CloseStatus status) throws Exception;
}
/**
* Web socket success callback.
*
* @author edgar
* @since 0.1.0
*/
interface SuccessCallback {
/**
* Invoked from a web socket.
*
* @throws Exception If something goes wrong.
*/
void invoke() throws Exception;
}
/**
* Web socket err callback.
*
* @author edgar
* @since 0.1.0
*/
interface OnError {
/**
* Invoked if something goes wrong.
*
* @param err Err cause.
*/
void onError(Throwable err);
}
/**
* Configure a web socket.
*
* @author edgar
* @since 0.1.0
*/
class Definition {
/**
* A route compiled pattern.
*/
private RoutePattern routePattern;
/**
* Defines the media types that the methods of a resource class or can consumes. Default is:
* {@literal *}/{@literal *}.
*/
private MediaType consumes = MediaType.plain;
/**
* Defines the media types that the methods of a resource class or can produces. Default is:
* {@literal *}/{@literal *}.
*/
private MediaType produces = MediaType.plain;
/** A path pattern. */
private String pattern;
/** A ws handler. */
private OnOpen handler;
/**
* Creates a new {@link Definition}.
*
* @param pattern A path pattern.
* @param handler A ws handler.
*/
public Definition(final String pattern, final OnOpen handler) {
requireNonNull(pattern, "A route path is required.");
requireNonNull(handler, "A handler is required.");
this.routePattern = new RoutePattern("WS", pattern);
// normalized pattern
this.pattern = routePattern.pattern();
this.handler = handler;
}
/**
* @return A route pattern.
*/
public String pattern() {
return pattern;
}
/**
* Test if the given path matches this web socket.
*
* @param path A path pattern.
* @return A web socket or empty optional.
*/
public Optional matches(final String path) {
RouteMatcher matcher = routePattern.matcher("WS" + path);
if (matcher.matches()) {
return Optional.of(asWebSocket(matcher));
}
return Optional.empty();
}
/**
* Set the media types the route can consume.
*
* @param type The media types to test for.
* @return This route definition.
*/
public Definition consumes(final String type) {
return consumes(MediaType.valueOf(type));
}
/**
* Set the media types the route can consume.
*
* @param type The media types to test for.
* @return This route definition.
*/
public Definition consumes(final MediaType type) {
this.consumes = requireNonNull(type, "A type is required.");
return this;
}
/**
* Set the media types the route can produces.
*
* @param type The media types to test for.
* @return This route definition.
*/
public Definition produces(final String type) {
return produces(MediaType.valueOf(type));
}
/**
* Set the media types the route can produces.
*
* @param type The media types to test for.
* @return This route definition.
*/
public Definition produces(final MediaType type) {
this.produces = requireNonNull(type, "A type is required.");
return this;
}
/**
* @return All the types this route can consumes.
*/
public MediaType consumes() {
return this.consumes;
}
/**
* @return All the types this route can produces.
*/
public MediaType produces() {
return this.produces;
}
@Override
public boolean equals(final Object obj) {
if (obj instanceof Definition) {
Definition def = (Definition) obj;
return this.pattern.equals(def.pattern);
}
return false;
}
@Override
public int hashCode() {
return pattern.hashCode();
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
buffer.append("WS ").append(pattern()).append("\n");
buffer.append(" consume: ").append(consumes()).append("\n");
buffer.append(" produces: ").append(produces()).append("\n");
return buffer.toString();
}
/**
* Creates a new web socket.
*
* @param matcher A route matcher.
* @return A new web socket.
*/
private WebSocket asWebSocket(final RouteMatcher matcher) {
return new WebSocketImpl(handler, matcher.path(), pattern, matcher.vars(),
consumes, produces);
}
}
interface Handler extends OnClose, OnMessage, OnError, OnOpen {
}
/** Default success callback. */
SuccessCallback SUCCESS = () -> {
};
/** Default err callback. */
OnError ERR = (ex) -> {
LoggerFactory.getLogger(WebSocket.class).error("error while sending data", ex);
};
/**
* "1000 indicates a normal closure, meaning that the purpose for which the connection
* was established has been fulfilled."
*/
CloseStatus NORMAL = new CloseStatus(1000, "Normal");
/**
* "1001 indicates that an endpoint is "going away", such as a server going down or a
* browser having navigated away from a page."
*/
CloseStatus GOING_AWAY = new CloseStatus(1001, "Going away");
/**
* "1002 indicates that an endpoint is terminating the connection due to a protocol
* error."
*/
CloseStatus PROTOCOL_ERROR = new CloseStatus(1002, "Protocol error");
/**
* "1003 indicates that an endpoint is terminating the connection because it has
* received a type of data it cannot accept (e.g., an endpoint that understands only
* text data MAY send this if it receives a binary message)."
*/
CloseStatus NOT_ACCEPTABLE = new CloseStatus(1003, "Not acceptable");
/**
* "1007 indicates that an endpoint is terminating the connection because it has
* received data within a message that was not consistent with the type of the message
* (e.g., non-UTF-8 [RFC3629] data within a text message)."
*/
CloseStatus BAD_DATA = new CloseStatus(1007, "Bad data");
/**
* "1008 indicates that an endpoint is terminating the connection because it has
* received a message that violates its policy. This is a generic status code that can
* be returned when there is no other more suitable status code (e.g., 1003 or 1009)
* or if there is a need to hide specific details about the policy."
*/
CloseStatus POLICY_VIOLATION = new CloseStatus(1008, "Policy violation");
/**
* "1009 indicates that an endpoint is terminating the connection because it has
* received a message that is too big for it to process."
*/
CloseStatus TOO_BIG_TO_PROCESS = new CloseStatus(1009, "Too big to process");
/**
* "1010 indicates that an endpoint (client) is terminating the connection because it
* has expected the server to negotiate one or more extension, but the server didn't
* return them in the response message of the WebSocket handshake. The list of
* extensions that are needed SHOULD appear in the /reason/ part of the Close frame.
* Note that this status code is not used by the server, because it can fail the
* WebSocket handshake instead."
*/
CloseStatus REQUIRED_EXTENSION = new CloseStatus(1010, "Required extension");
/**
* "1011 indicates that a server is terminating the connection because it encountered
* an unexpected condition that prevented it from fulfilling the request."
*/
CloseStatus SERVER_ERROR = new CloseStatus(1011, "Server error");
/**
* "1012 indicates that the service is restarted. A client may reconnect, and if it
* chooses to do, should reconnect using a randomized delay of 5 - 30s."
*/
CloseStatus SERVICE_RESTARTED = new CloseStatus(1012, "Service restarted");
/**
* "1013 indicates that the service is experiencing overload. A client should only
* connect to a different IP (when there are multiple for the target) or reconnect to
* the same IP upon user action."
*/
CloseStatus SERVICE_OVERLOAD = new CloseStatus(1013, "Service overload");
/**
* @return Current request path.
*/
String path();
/**
* @return The currently matched pattern.
*/
String pattern();
/**
* @return The currently matched path variables (if any).
*/
Map vars();
/**
* @return The type this route can consumes, defaults is: {@code * / *}.
*/
MediaType consumes();
/**
* @return The type this route can produces, defaults is: {@code * / *}.
*/
MediaType produces();
/**
* Register a callback to execute when a new message arrive.
*
* @param callback A callback
* @throws Exception If something goes wrong.
*/
void onMessage(OnMessage callback) throws Exception;
/**
* Register an error callback to execute when an error is found.
*
* @param callback A callback
*/
void onError(OnError callback);
/**
* Register an close callback to execute when client close the web socket.
*
* @param callback A callback
* @throws Exception If something goes wrong.
*/
void onClose(OnClose callback) throws Exception;
/**
* Gracefully closes the connection, after sending a description message
*
* @param code Close status code.
* @param reason Close reason.
*/
default void close(final int code, final String reason) {
close(CloseStatus.of(code, reason));
}
/**
* Gracefully closes the connection, after sending a description message
*
* @param code Close status code.
*/
default void close(final int code) {
close(CloseStatus.of(code));
}
/**
* Gracefully closes the connection, after sending a description message
*/
@Override
default void close() {
close(NORMAL);
}
/**
* True if the websocket is still open.
*
* @return True if the websocket is still open.
*/
boolean isOpen();
/**
* Gracefully closes the connection, after sending a description message
*
* @param status Close status code.
*/
void close(CloseStatus status);
/**
* Resume the client stream.
*/
void resume();
/**
* Pause the client stream.
*/
void pause();
/**
* Immediately shuts down the connection.
*
* @throws Exception If something goes wrong.
*/
void terminate() throws Exception;
/**
* Send data through the connection.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @throws Exception If something goes wrong.
*/
default void send(final Object data) throws Exception {
send(data, SUCCESS, ERR);
}
/**
* Send data through the connection.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @param success A success callback.
* @throws Exception If something goes wrong.
*/
default void send(final Object data, final SuccessCallback success) throws Exception {
send(data, success, ERR);
}
/**
* Send data through the connection.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @param err An err callback.
* @throws Exception If something goes wrong.
*/
default void send(final Object data, final OnError err) throws Exception {
send(data, SUCCESS, err);
}
/**
* Send data through the connection.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @param success A success callback.
* @param err An err callback.
* @throws Exception If something goes wrong.
*/
void send(Object data, SuccessCallback success, OnError err) throws Exception;
/**
* Send data to all connected sessions.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @throws Exception If something goes wrong.
*/
default void broadcast(final Object data) throws Exception {
broadcast(data, SUCCESS, ERR);
}
/**
* Send data to all connected sessions.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @param success A success callback.
* @throws Exception If something goes wrong.
*/
default void broadcast(final Object data, final SuccessCallback success) throws Exception {
broadcast(data, success, ERR);
}
/**
* Send data to all connected sessions.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @param err An err callback.
* @throws Exception If something goes wrong.
*/
default void broadcast(final Object data, final OnError err) throws Exception {
broadcast(data, SUCCESS, err);
;
}
/**
* Send data to all connected sessions.
*
* If the web socket is closed this method throw an {@link Err} with {@link #NORMAL} close status.
*
* @param data Data to send.
* @param success A success callback.
* @param err An err callback.
* @throws Exception If something goes wrong.
*/
void broadcast(Object data, SuccessCallback success, OnError err)
throws Exception;
}