| 1 | /** |
| 2 | * Licensed to jclouds, Inc. (jclouds) under one or more |
| 3 | * contributor license agreements. See the NOTICE file |
| 4 | * distributed with this work for additional information |
| 5 | * regarding copyright ownership. jclouds licenses this file |
| 6 | * to you under the Apache License, Version 2.0 (the |
| 7 | * "License"); you may not use this file except in compliance |
| 8 | * with the License. You may obtain a copy of the License at |
| 9 | * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 11 | * |
| 12 | * Unless required by applicable law or agreed to in writing, |
| 13 | * software distributed under the License is distributed on an |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 15 | * KIND, either express or implied. See the License for the |
| 16 | * specific language governing permissions and limitations |
| 17 | * under the License. |
| 18 | */ |
| 19 | package org.jclouds.http.handlers; |
| 20 | |
| 21 | import static java.util.Collections.singletonList; |
| 22 | import static javax.ws.rs.core.HttpHeaders.HOST; |
| 23 | import static org.jclouds.http.HttpUtils.closeClientButKeepContentStream; |
| 24 | |
| 25 | import java.net.URI; |
| 26 | |
| 27 | import javax.annotation.Resource; |
| 28 | import javax.inject.Named; |
| 29 | import javax.inject.Provider; |
| 30 | import javax.inject.Singleton; |
| 31 | import javax.ws.rs.core.HttpHeaders; |
| 32 | import javax.ws.rs.core.UriBuilder; |
| 33 | |
| 34 | import org.jclouds.Constants; |
| 35 | import org.jclouds.http.HttpCommand; |
| 36 | import org.jclouds.http.HttpRequest; |
| 37 | import org.jclouds.http.HttpResponse; |
| 38 | import org.jclouds.http.HttpRetryHandler; |
| 39 | import org.jclouds.http.utils.ModifyRequest; |
| 40 | import org.jclouds.logging.Logger; |
| 41 | |
| 42 | import com.google.inject.Inject; |
| 43 | |
| 44 | /** |
| 45 | * Handles Retryable responses with error codes in the 3xx range |
| 46 | * |
| 47 | * @author Adrian Cole |
| 48 | */ |
| 49 | @Singleton |
| 50 | public class RedirectionRetryHandler implements HttpRetryHandler { |
| 51 | @Inject(optional = true) |
| 52 | @Named(Constants.PROPERTY_MAX_REDIRECTS) |
| 53 | protected int retryCountLimit = 5; |
| 54 | |
| 55 | @Resource |
| 56 | protected Logger logger = Logger.NULL; |
| 57 | |
| 58 | protected final BackoffLimitedRetryHandler backoffHandler; |
| 59 | protected final Provider<UriBuilder> uriBuilderProvider; |
| 60 | |
| 61 | @Inject |
| 62 | protected RedirectionRetryHandler(Provider<UriBuilder> uriBuilderProvider, BackoffLimitedRetryHandler backoffHandler) { |
| 63 | this.backoffHandler = backoffHandler; |
| 64 | this.uriBuilderProvider = uriBuilderProvider; |
| 65 | } |
| 66 | |
| 67 | public boolean shouldRetryRequest(HttpCommand command, HttpResponse response) { |
| 68 | closeClientButKeepContentStream(response); |
| 69 | String hostHeader = response.getFirstHeaderOrNull(HttpHeaders.LOCATION); |
| 70 | if (command.incrementRedirectCount() < retryCountLimit && hostHeader != null) { |
| 71 | URI redirectionUrl = URI.create(hostHeader); |
| 72 | |
| 73 | // if you are sent the same uri, assume there's a transient problem and retry. |
| 74 | HttpRequest currentRequest = command.getCurrentRequest(); |
| 75 | if (redirectionUrl.equals(currentRequest.getEndpoint())) |
| 76 | return backoffHandler.shouldRetryRequest(command, response); |
| 77 | |
| 78 | assert redirectionUrl.getPath() != null : "no path in redirect header from: " + response; |
| 79 | if (!redirectionUrl.isAbsolute()) { |
| 80 | UriBuilder builder = uriBuilderProvider.get().uri(currentRequest.getEndpoint()); |
| 81 | builder.replacePath(redirectionUrl.getPath()); |
| 82 | if (redirectionUrl.getQuery() != null) |
| 83 | builder.replaceQuery(redirectionUrl.getQuery()); |
| 84 | redirectionUrl = builder.build(); |
| 85 | } |
| 86 | |
| 87 | if (currentRequest.getFirstHeaderOrNull(HOST) != null && redirectionUrl.getHost() != null) { |
| 88 | command.setCurrentRequest(ModifyRequest.replaceHeader(currentRequest, HOST, |
| 89 | singletonList(redirectionUrl.getHost())).toBuilder().endpoint(redirectionUrl).build()); |
| 90 | } else { |
| 91 | command.setCurrentRequest(currentRequest.toBuilder().endpoint(redirectionUrl).build()); |
| 92 | } |
| 93 | return true; |
| 94 | } else { |
| 95 | return false; |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | } |