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package io.joynr.messaging.bounceproxy.controller;
/*
* #%L
* joynr::java::messaging::bounceproxy::bounceproxy-controller
* %%
* Copyright (C) 2011 - 2017 BMW Car IT GmbH
* %%
* 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.
* #L%
*/
import io.joynr.exceptions.JoynrRuntimeException;
import io.joynr.messaging.bounceproxy.controller.exception.JoynrProtocolException;
import io.joynr.messaging.info.ControlledBounceProxyInformation;
import io.joynr.messaging.service.ChannelServiceConstants;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URI;
import org.apache.http.StatusLine;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.inject.Inject;
import com.google.inject.name.Named;
/**
* Facade for a remote bounce proxy. This component encapsulates communication
* with services of a bounce proxy.
*
* @author christina.strobel
*
*/
public class RemoteBounceProxyFacade {
private static final Logger logger = LoggerFactory.getLogger(RemoteBounceProxyFacade.class);
private CloseableHttpClient httpclient;
private long sendCreateChannelRetryIntervalMs;
private int sendCreateChannelMaxRetries;
@Inject
public RemoteBounceProxyFacade(CloseableHttpClient httpclient,
@Named(BounceProxyControllerPropertyKeys.PROPERTY_BPC_SEND_CREATE_CHANNEL_RETRY_INTERVAL_MS) long sendCreateChannelRetryIntervalMs,
@Named(BounceProxyControllerPropertyKeys.PROPERTY_BPC_SEND_CREATE_CHANNEL_MAX_RETRY_COUNT) int sendCreateChannelMaxRetries) {
this.httpclient = httpclient;
this.sendCreateChannelRetryIntervalMs = sendCreateChannelRetryIntervalMs;
this.sendCreateChannelMaxRetries = sendCreateChannelMaxRetries;
}
/**
* Creates a channel on the remote bounce proxy.
*
* @param bpInfo information for a bounce proxy, including the cluster the
* bounce proxy is running on
* @param ccid the channel id
* @param trackingId the tracking id
* @return URI representing the channel
* @throws JoynrProtocolException
* if the bounce proxy rejects channel creation
*/
public URI createChannel(ControlledBounceProxyInformation bpInfo, String ccid, String trackingId)
throws JoynrProtocolException {
try {
// Try to create a channel on a bounce proxy with maximum number of
// retries.
return createChannelLoop(bpInfo, ccid, trackingId, sendCreateChannelMaxRetries);
} catch (JoynrProtocolException e) {
logger.error("Unexpected bounce proxy behaviour: message: {}", e.getMessage());
throw e;
} catch (JoynrRuntimeException e) {
logger.error("Channel creation on bounce proxy failed: message: {}", e.getMessage());
throw e;
} catch (Exception e) {
logger.error("Uncaught exception in channel creation: message: {}", e.getMessage());
throw new JoynrRuntimeException("Unknown exception when creating channel '" + ccid + "' on bounce proxy '"
+ bpInfo.getId() + "'", e);
}
}
/**
* Starts a loop to send createChannel requests to a bounce proxy with a
* maximum number of retries.
*
* @param bpInfo
* information about the bounce proxy to create the channel at
* @param ccid
* the channel ID for the channel to create
* @param trackingId
* a tracking ID necessary for long polling
* @param retries
* the maximum number of retries
* @return the url of the channel at the bounce proxy as it was returned by
* the bounce proxy itself
* @throws JoynrProtocolException
* if the bounce proxy rejects channel creation
*/
private URI createChannelLoop(ControlledBounceProxyInformation bpInfo, String ccid, String trackingId, int retries)
throws JoynrProtocolException {
while (retries > 0) {
retries--;
try {
return sendCreateChannelHttpRequest(bpInfo, ccid, trackingId);
} catch (IOException e) {
// failed to establish communication with the bounce proxy
logger.error("creating a channel on bounce proxy {} failed due to communication errors: message: {}",
bpInfo.getId(),
e.getMessage());
}
// try again if creating the channel failed
try {
Thread.sleep(sendCreateChannelRetryIntervalMs);
} catch (InterruptedException e) {
throw new JoynrRuntimeException("creating a channel on bounce proxy " + bpInfo.getId()
+ " was interrupted.");
}
}
// the maximum number of retries passed, so channel creation failed
throw new JoynrRuntimeException("creating a channel on bounce proxy " + bpInfo.getId() + " failed.");
}
private URI sendCreateChannelHttpRequest(ControlledBounceProxyInformation bpInfo, String ccid, String trackingId)
throws IOException,
JoynrProtocolException {
// TODO jsessionid handling
final String url = bpInfo.getLocationForBpc().toString() + "channels/?ccid=" + ccid;
logger.debug("Using bounce proxy channel service URL: {}", url);
HttpPost postCreateChannel = new HttpPost(url.trim());
postCreateChannel.addHeader(ChannelServiceConstants.X_ATMOSPHERE_TRACKING_ID, trackingId);
CloseableHttpResponse response = null;
try {
response = httpclient.execute(postCreateChannel);
StatusLine statusLine = response.getStatusLine();
int statusCode = statusLine.getStatusCode();
if (statusCode == HttpURLConnection.HTTP_CREATED) {
// the channel was created successfully
// check if bounce proxy ID header was sent correctly
if (response.containsHeader("bp")) {
String bounceProxyId = response.getFirstHeader("bp").getValue();
if (bounceProxyId == null || !bounceProxyId.equals(bpInfo.getId())) {
throw new JoynrProtocolException("Bounce proxy ID '" + bounceProxyId
+ "' returned by bounce proxy '" + bpInfo.getId() + "' does not match.");
}
} else {
throw new JoynrProtocolException("No bounce proxy ID returned by bounce proxy '" + bpInfo.getId()
+ "'");
}
// get URI of newly created channel
if (!response.containsHeader("Location")) {
throw new JoynrProtocolException("No channel location returned by bounce proxy '" + bpInfo.getId()
+ "'");
}
String locationValue = response.getFirstHeader("Location").getValue();
if (locationValue == null || locationValue.isEmpty()) {
throw new JoynrProtocolException("Bounce proxy '" + bpInfo.getId()
+ "' didn't return a channel location.");
}
try {
URI channelLocation = new URI(locationValue);
logger.info("Successfully created channel '{}' on bounce proxy '{}'", ccid, bpInfo.getId());
return channelLocation;
} catch (Exception e) {
throw new JoynrProtocolException("Cannot parse channel location '" + locationValue
+ "' returned by bounce proxy '" + bpInfo.getId() + "'", e);
}
}
// the bounce proxy is not excepted to reject this call as it was
// chosen based on performance measurements sent by it
logger.error("Failed to create channel on bounce proxy '{}'. Response: {}", bpInfo.getId(), response);
throw new JoynrProtocolException("Bounce Proxy " + bpInfo.getId()
+ " rejected channel creation (Response: " + response + ")");
} finally {
if (response != null) {
response.close();
}
}
}
}
