| /** |
| * 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.oozie.service; |
| |
| import org.apache.oozie.util.ParamChecker; |
| import org.apache.hadoop.conf.Configuration; |
| |
| import java.io.UnsupportedEncodingException; |
| import java.net.URLDecoder; |
| import java.nio.charset.StandardCharsets; |
| import java.text.MessageFormat; |
| |
| /** |
| * Service that generates and parses callback URLs. |
| */ |
| public class CallbackService implements Service { |
| |
| public static final String CONF_PREFIX = Service.CONF_PREFIX + "CallbackService."; |
| |
| public static final String CONF_BASE_URL = CONF_PREFIX + "base.url"; |
| |
| public static final String CONF_EARLY_REQUEUE_MAX_RETRIES = CONF_PREFIX + "early.requeue.max.retries"; |
| |
| private Configuration oozieConf; |
| private int earlyRequeueMaxRetries; |
| |
| /** |
| * Initialize the service. |
| * |
| * @param services services instance. |
| */ |
| public void init(Services services) { |
| oozieConf = services.getConf(); |
| earlyRequeueMaxRetries = ConfigurationService.getInt(CONF_EARLY_REQUEUE_MAX_RETRIES); |
| } |
| |
| /** |
| * Destroy the service. |
| */ |
| public void destroy() { |
| } |
| |
| /** |
| * Return the public interface of the Dag engine service. |
| * |
| * @return {@link CallbackService}. |
| */ |
| public Class<? extends Service> getInterface() { |
| return CallbackService.class; |
| } |
| |
| private static final String ID_PARAM = "id="; |
| private static final String STATUS_PARAM = "status="; |
| private static final String CALL_BACK_QUERY_STRING = "{0}?" + ID_PARAM + "{1}" + "&" + STATUS_PARAM + "{2}"; |
| |
| /** |
| * Create a callback URL. |
| * |
| * @param actionId action ID for the callback URL. |
| * @param externalStatusVar variable for the caller to inject the external status. |
| * @return the callback URL. |
| */ |
| public String createCallBackUrl(String actionId, String externalStatusVar) { |
| ParamChecker.notEmpty(actionId, "actionId"); |
| ParamChecker.notEmpty(externalStatusVar, "externalStatusVar"); |
| //TODO: figure out why double encoding is happening in case of hadoop callbacks. |
| String baseCallbackUrl = ConfigurationService.get(oozieConf, CONF_BASE_URL); |
| return MessageFormat.format(CALL_BACK_QUERY_STRING, baseCallbackUrl, actionId, externalStatusVar); |
| } |
| |
| private String getParam(String str, String name) { |
| String value = null; |
| int start = str.indexOf(name); |
| if (start > -1) { |
| int end = str.indexOf("&", start + 1); |
| start = start + name.length(); |
| value = (end > -1) ? str.substring(start, end) : str.substring(start); |
| } |
| return value; |
| } |
| |
| /** |
| * Return if a callback URL is valid or not. |
| * |
| * @param callback callback URL (it can be just the callback portion of it). |
| * @return <code>true</code> if the callback URL is valid, <code>false</code> if it is not. |
| */ |
| public boolean isValid(String callback) { |
| return callback != null && getParam(callback, ID_PARAM) != null && getParam(callback, STATUS_PARAM) != null; |
| } |
| |
| /** |
| * Return the action ID from a callback URL. |
| * |
| * @param callback callback URL (it can be just the callback portion of it). |
| * @return the action ID from a callback URL. |
| */ |
| public String getActionId(String callback) { |
| try { |
| return URLDecoder.decode(getParam(ParamChecker.notEmpty(callback, "callback"), ID_PARAM), |
| StandardCharsets.UTF_8.name()); |
| } |
| catch (UnsupportedEncodingException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| /** |
| * Return the action external status from a callback URL. |
| * |
| * @param callback callback URL (it can be just the callback portion of it). |
| * @return the action external status from a callback URL. |
| */ |
| public String getExternalStatus(String callback) { |
| try { |
| return URLDecoder.decode(getParam(ParamChecker.notEmpty(callback, "callback"), STATUS_PARAM), |
| StandardCharsets.UTF_8.name()); |
| } |
| catch (UnsupportedEncodingException ex) { |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| public int getEarlyRequeueMaxRetries() { |
| return earlyRequeueMaxRetries; |
| } |
| } |