| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.sling.distribution.trigger.impl; |
| |
| import javax.annotation.Nonnull; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.Future; |
| |
| import org.apache.http.HttpHost; |
| import org.apache.http.HttpResponse; |
| import org.apache.http.auth.AuthScope; |
| import org.apache.http.auth.UsernamePasswordCredentials; |
| import org.apache.http.client.CredentialsProvider; |
| import org.apache.http.client.methods.HttpGet; |
| import org.apache.http.client.utils.URIUtils; |
| import org.apache.http.concurrent.FutureCallback; |
| import org.apache.http.impl.client.BasicCredentialsProvider; |
| import org.apache.http.impl.nio.client.CloseableHttpAsyncClient; |
| import org.apache.http.impl.nio.client.HttpAsyncClients; |
| import org.apache.http.nio.ContentDecoder; |
| import org.apache.http.nio.IOControl; |
| import org.apache.http.nio.protocol.BasicAsyncRequestProducer; |
| import org.apache.http.nio.protocol.BasicAsyncResponseConsumer; |
| import org.apache.sling.commons.scheduler.ScheduleOptions; |
| import org.apache.sling.commons.scheduler.Scheduler; |
| import org.apache.sling.distribution.DistributionRequest; |
| import org.apache.sling.distribution.DistributionRequestType; |
| import org.apache.sling.distribution.SimpleDistributionRequest; |
| import org.apache.sling.distribution.common.DistributionException; |
| import org.apache.sling.distribution.transport.DistributionTransportSecretProvider; |
| import org.apache.sling.distribution.transport.impl.DistributionEndpoint; |
| import org.apache.sling.distribution.trigger.DistributionRequestHandler; |
| import org.apache.sling.distribution.trigger.DistributionTrigger; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * {@link org.apache.sling.distribution.trigger.DistributionTrigger} to trigger distribution upon reception of server sent events |
| * on a certain URL |
| */ |
| public class RemoteEventDistributionTrigger implements DistributionTrigger { |
| private final static String SCHEDULE_NAME = "remoteEventTrigger"; |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| private final DistributionEndpoint endpoint; |
| private final DistributionTransportSecretProvider distributionTransportSecretProvider; |
| |
| private Scheduler scheduler; |
| |
| private final Map<DistributionRequestHandler, Future<HttpResponse>> requests = new ConcurrentHashMap<DistributionRequestHandler, Future<HttpResponse>>(); |
| |
| public RemoteEventDistributionTrigger(String endpoint, DistributionTransportSecretProvider distributionTransportSecretProvider, Scheduler scheduler) { |
| if (endpoint == null) { |
| throw new IllegalArgumentException("Endpoint is required"); |
| } |
| |
| if (distributionTransportSecretProvider == null) { |
| throw new IllegalArgumentException("Authentication provider is required"); |
| } |
| |
| this.distributionTransportSecretProvider = distributionTransportSecretProvider; |
| this.endpoint = new DistributionEndpoint(endpoint); |
| this.scheduler = scheduler; |
| } |
| |
| public void register(@Nonnull DistributionRequestHandler requestHandler) throws DistributionException { |
| try { |
| log.info("applying remote event distribution trigger"); |
| |
| ScheduleOptions options = scheduler.NOW(); |
| options.name(getJobName(requestHandler)); |
| options.canRunConcurrently(false); |
| options.onLeaderOnly(true); |
| scheduler.schedule(new EventBasedDistribution(requestHandler), options); |
| } catch (Exception e) { |
| throw new DistributionException("unable to register handler " + requestHandler, e); |
| } |
| } |
| |
| public void unregister(@Nonnull DistributionRequestHandler requestHandler) throws DistributionException { |
| Future<HttpResponse> httpResponseFuture = requests.remove(requestHandler); |
| if (httpResponseFuture != null) { |
| httpResponseFuture.cancel(true); |
| } |
| scheduler.unschedule(getJobName(requestHandler)); |
| } |
| |
| private String getJobName(DistributionRequestHandler requestHandler) { |
| return SCHEDULE_NAME + requestHandler.toString(); |
| } |
| |
| private class SSEResponseConsumer extends BasicAsyncResponseConsumer { |
| |
| private final DistributionRequestHandler handler; |
| |
| private SSEResponseConsumer(DistributionRequestHandler handler) { |
| this.handler = handler; |
| } |
| |
| @Override |
| protected void onContentReceived(ContentDecoder decoder, IOControl ioctrl) throws IOException { |
| log.debug("complete {}", decoder.isCompleted()); |
| ByteBuffer buffer = ByteBuffer.allocate(1024); |
| decoder.read(buffer); |
| log.debug("content {} received {},{}", new Object[]{buffer, decoder, ioctrl}); |
| |
| // TODO : currently it always triggers pull request on /, should this be configurable? |
| DistributionRequest distributionRequest = new SimpleDistributionRequest(DistributionRequestType.PULL, "/"); |
| handler.handle(null, distributionRequest); |
| log.info("distribution request to agent {} sent ({} {})", new Object[]{ |
| handler, |
| distributionRequest.getRequestType(), |
| distributionRequest.getPaths()}); |
| |
| super.onContentReceived(decoder, ioctrl); |
| } |
| |
| @Override |
| protected void onResponseReceived(HttpResponse response) throws IOException { |
| log.info("response received {}", response); |
| super.onResponseReceived(response); |
| } |
| } |
| |
| private class EventBasedDistribution implements Runnable { |
| private final DistributionRequestHandler requestHandler; |
| |
| public EventBasedDistribution(DistributionRequestHandler requestHandler) { |
| this.requestHandler = requestHandler; |
| } |
| |
| public void run() { |
| try { |
| log.debug("getting events from {}", endpoint.getUri().toString()); |
| |
| log.debug("preparing request"); |
| |
| // TODO : http client should be cached and reused |
| |
| CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); |
| |
| Map<String, String> credentialsMap = distributionTransportSecretProvider.getSecret(endpoint.getUri()).asCredentialsMap(); |
| if (credentialsMap != null) { |
| String username = credentialsMap.get("username"); |
| String password = credentialsMap.get("password"); |
| credentialsProvider.setCredentials(new AuthScope(new HttpHost(endpoint.getUri().getHost(), endpoint.getUri().getPort())), |
| new UsernamePasswordCredentials(username, password)); |
| |
| final CloseableHttpAsyncClient httpClient = HttpAsyncClients.custom() |
| .setDefaultCredentialsProvider(credentialsProvider) |
| .build(); |
| |
| HttpGet get = new HttpGet(endpoint.getUri()); |
| HttpHost target = URIUtils.extractHost(get.getURI()); |
| BasicAsyncRequestProducer basicAsyncRequestProducer = new BasicAsyncRequestProducer(target, get); |
| httpClient.start(); |
| try { |
| log.debug("sending request"); |
| Future<HttpResponse> futureResponse = httpClient.execute( |
| basicAsyncRequestProducer, |
| new SSEResponseConsumer(requestHandler), new FutureCallback<HttpResponse>() { |
| public void completed(HttpResponse httpResponse) { |
| log.debug("response received {}", httpResponse); |
| } |
| |
| public void failed(Exception e) { |
| log.warn("failed request {}", e.toString()); |
| } |
| |
| public void cancelled() { |
| log.warn("request cancelled"); |
| } |
| }); |
| requests.put(requestHandler, futureResponse); |
| futureResponse.get(); |
| |
| } catch (Exception e) { |
| log.warn("cannot communicate with {}", endpoint, e); |
| } |
| httpClient.close(); |
| log.debug("request finished"); |
| } |
| } catch (Exception e) { |
| log.error("cannot run event based distribution {}", e); |
| } |
| } |
| } |
| |
| public void disable() { |
| |
| for (Map.Entry<DistributionRequestHandler, Future<HttpResponse>> entry : requests.entrySet()) { |
| entry.getValue().cancel(true); |
| scheduler.unschedule(getJobName(entry.getKey())); |
| } |
| } |
| } |