org.everrest.websockets.WS2RESTAdapter Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2012-2016 Codenvy, S.A.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.everrest.websockets;
import static javax.websocket.CloseReason.CloseCodes.VIOLATED_POLICY;
import org.everrest.core.impl.ContainerRequest;
import org.everrest.core.impl.ContainerResponse;
import org.everrest.core.impl.EnvironmentContext;
import org.everrest.core.impl.EverrestProcessor;
import org.everrest.core.impl.InputHeadersMap;
import org.everrest.core.impl.provider.json.JsonException;
import org.everrest.core.impl.provider.json.JsonParser;
import org.everrest.core.impl.provider.json.JsonValue;
import org.everrest.websockets.message.InputMessage;
import org.everrest.websockets.message.OutputMessage;
import org.everrest.websockets.message.Pair;
import org.everrest.websockets.message.RestInputMessage;
import org.everrest.websockets.message.RestOutputMessage;
import org.slf4j.LoggerFactory;
import javax.websocket.DecodeException;
import javax.websocket.EncodeException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.SecurityContext;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executor;
/**
* @author andrew00x
*/
class WS2RESTAdapter implements WSMessageReceiver {
private static final org.slf4j.Logger LOG = LoggerFactory.getLogger(WS2RESTAdapter.class);
private static final URI BASE_URI = URI.create("");
private final WSConnection connection;
private final SecurityContext securityContext;
private final EverrestProcessor everrestProcessor;
private final Executor executor;
private final Set inProgress;
WS2RESTAdapter(WSConnection connection, SecurityContext securityContext, EverrestProcessor everrestProcessor, Executor executor) {
this.connection = connection;
this.securityContext = securityContext;
this.everrestProcessor = everrestProcessor;
this.executor = executor;
this.inProgress = Collections.newSetFromMap(new ConcurrentHashMap());
}
@Override
public void onMessage(final InputMessage input) {
if (!(input instanceof RestInputMessage)) {
throw new IllegalArgumentException("Invalid input message. ");
}
final RestInputMessage request = (RestInputMessage)input;
final MultivaluedMap headers = Pair.toMap(request.getHeaders());
final String messageType = headers.getFirst("x-everrest-websocket-message-type");
if ("ping".equalsIgnoreCase(messageType)) {
sendPongMessage(request);
return;
}
if ("subscribe-channel".equalsIgnoreCase(messageType) || "unsubscribe-channel".equalsIgnoreCase(messageType)) {
final String channel = parseSubscriptionMessage(input);
final RestOutputMessage response = newOutputMessage(request);
// Send the same body as in request.
response.setBody(request.getBody());
response.setHeaders(new Pair[]{Pair.of("x-everrest-websocket-message-type", messageType)});
if (channel != null) {
if ("subscribe-channel".equalsIgnoreCase(messageType)) {
connection.subscribeToChannel(channel);
} else {
connection.unsubscribeFromChannel(channel);
}
response.setResponseCode(200);
} else {
LOG.error("Invalid message: {} ", input.getBody());
// If cannot get channel name from input message consider it is client error.
response.setResponseCode(400);
}
doSendMessage(response);
return;
}
final String uuid = request.getUuid();
if (uuid == null) {
throw new IllegalArgumentException("Invalid input message. Message UUID is required. ");
}
if (inProgress.contains(uuid)) {
// Re-send accept response if client tries send message with the same id
final RestOutputMessage response = newOutputMessage(request);
response.setResponseCode(202);
doSendMessage(response);
}
executor.execute(new Runnable() {
@Override
public void run() {
try {
ByteArrayInputStream data = null;
final String body = input.getBody();
if (body != null) {
try {
data = new ByteArrayInputStream(body.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
// Should never happen since UTF-8 is supported.
throw new IllegalStateException(e.getMessage(), e);
}
}
final String requestPath = request.getPath();
final URI requestUri = requestPath == null || requestPath.isEmpty()
? URI.create("/")
: URI.create(requestPath.charAt(0) == '/' ? requestPath : ('/' + requestPath));
if (data != null) {
// Always know content length since we use ByteArrayInputStream.
headers.putSingle("content-length", Integer.toString(data.available()));
}
final RestOutputMessage response = newOutputMessage(request);
final ContainerRequest internalRequest = new ContainerRequest(request.getMethod(),
requestUri,
BASE_URI,
data,
new InputHeadersMap(headers),
securityContext);
final ContainerResponse internalResponse = new ContainerResponse(new EverrestResponseWriter(response));
final EnvironmentContext env = new EnvironmentContext();
env.put(WSConnection.class, connection);
everrestProcessor.process(internalRequest, internalResponse, env);
doSendMessage(response);
} catch (Exception e) {
LOG.error(e.getMessage(), e);
} finally {
inProgress.remove(uuid);
}
}
});
// send accept response
final RestOutputMessage restOutputMessage = newOutputMessage(request);
restOutputMessage.setResponseCode(202);
inProgress.add(uuid);
doSendMessage(restOutputMessage);
}
private void sendPongMessage(RestInputMessage pingMessage) {
final RestOutputMessage pong = newOutputMessage(pingMessage);
pong.setBody(pingMessage.getBody());
pong.setResponseCode(200);
pong.setHeaders(new Pair[]{Pair.of("x-everrest-websocket-message-type", "pong")});
doSendMessage(pong);
}
@Override
public void onError(Exception error) {
LOG.error(error.getMessage(), error);
if (error instanceof DecodeException || error instanceof EncodeException) {
try {
connection.close(VIOLATED_POLICY.getCode(), error.getMessage());
} catch (IOException e) {
LOG.error(e.getMessage(), e);
}
}
}
private RestOutputMessage newOutputMessage(RestInputMessage input) {
final RestOutputMessage output = new RestOutputMessage();
output.setUuid(input.getUuid());
output.setMethod(input.getMethod());
output.setPath(input.getPath());
return output;
}
private void doSendMessage(OutputMessage output) {
if (connection.isConnected()) {
try {
connection.sendMessage(output);
} catch (EncodeException | IOException e) {
LOG.error(e.getMessage(), e);
}
} else {
LOG.warn("Connection is already closed. ");
}
}
/**
* Get name of channel from input message. Expected format of message: {"channel":"my_channel"}. Method return {@code null} if message
* is invalid.
*/
private String parseSubscriptionMessage(InputMessage input) {
final JsonParser p = new JsonParser();
try {
p.parse(new StringReader(input.getBody()));
} catch (JsonException e) {
return null;
}
final JsonValue jv = p.getJsonObject().getElement("channel");
return jv != null ? jv.getStringValue() : null;
}
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