io.reactivex.netty.examples.http.ws.echo.WebSocketEchoClient Maven / Gradle / Ivy
/*
* Copyright 2015 Netflix, Inc.
*
* 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.
*
*/
package io.reactivex.netty.examples.http.ws.echo;
import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import io.netty.handler.codec.http.websocketx.WebSocketFrame;
import io.netty.handler.logging.LogLevel;
import io.reactivex.netty.examples.ExamplesEnvironment;
import io.reactivex.netty.protocol.http.client.HttpClient;
import io.reactivex.netty.protocol.http.ws.client.WebSocketResponse;
import org.slf4j.Logger;
import rx.Observable;
import java.net.SocketAddress;
import java.nio.charset.Charset;
/**
* An example to demonstrate how to write a WebSocket client. This example sends a stream of 10 websocket frames to the
* specified server and expects 10 websocket frames in response.
*
* There are three ways of running this example:
*
* Default
*
* The default way is to just run this class with no arguments, which will start a server ({@link WebSocketEchoServer})
* on an ephemeral port and then send an HTTP request to that server and print the response.
*
* After starting {@link WebSocketEchoServer}
*
* If you want to see how {@link WebSocketEchoServer} work, you can run {@link WebSocketEchoServer} by yourself and
* then pass the port on which the server started to this class as a program argument:
*
java io.reactivex.netty.examples.http.ws.echo.WebSocketEchoClient [server port]
*
* Existing HTTP server
*
* You can also use this client to send a GET request "/ws" to an existing HTTP server (different than
* {@link WebSocketEchoServer}) by passing the port and host of the existing server similar to the case above:
*
java io.reactivex.netty.examples.http.ws.echo.WebSocketEchoClient [server port]
* If the server host is omitted from the above, it defaults to "127.0.0.1"
*
* In all the above usages, this client will print the response received from the server.
*/
public final class WebSocketEchoClient {
public static void main(String[] args) {
ExamplesEnvironment env = ExamplesEnvironment.newEnvironment(WebSocketEchoClient.class);
/*
* Retrieves the server address, using the following algorithm:
*
- If any arguments are passed, then use the first argument as the server port.
- If available, use the second argument as the server host, else default to localhost
- Otherwise, start the passed server class and use that address.
*/
SocketAddress socketAddress = env.getServerAddress(WebSocketEchoServer.class, args);
Logger logger = env.getLogger();
HttpClient.newClient(socketAddress)
.enableWireLogging("ws-echo-client", LogLevel.DEBUG)
.createGet("/ws")
.requestWebSocketUpgrade()
.doOnNext(resp -> logger.info(resp.toString()))
.flatMap(WebSocketResponse::getWebSocketConnection)
.flatMap(conn -> conn.write(Observable.range(1, 10)
.map(anInt -> new TextWebSocketFrame("Interval " + anInt))
.cast(WebSocketFrame.class)
.concatWith(Observable.just(new CloseWebSocketFrame())))
.cast(WebSocketFrame.class)
.mergeWith(conn.getInput())
)
.take(10)
.toBlocking()
.forEach(frame -> logger.info(frame.content().toString(Charset.defaultCharset())));
}
}