001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     * 
010     *      http://www.apache.org/licenses/LICENSE-2.0
011     * 
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.oozie.util;
019    
020    import java.io.IOException;
021    import java.util.HashMap;
022    import java.util.Map;
023    
024    import org.apache.hadoop.conf.Configuration;
025    import org.apache.hadoop.fs.FileSystem;
026    import org.apache.hadoop.fs.Path;
027    import org.apache.oozie.ErrorCode;
028    import org.apache.oozie.client.OozieClient;
029    import org.apache.oozie.client.XOozieClient;
030    import org.apache.oozie.command.CommandException;
031    import org.apache.oozie.service.HadoopAccessorException;
032    import org.apache.oozie.service.HadoopAccessorService;
033    import org.apache.oozie.service.Services;
034    
035    /**
036     * Job utilities.
037     */
038    public class JobUtils {
039        /**
040         * Normalize appPath in job conf with the provided user/group - If it's not jobs via proxy submission, after
041         * normalization appPath always points to job's Xml definition file.
042         * <p/>
043         *
044         * @param user user
045         * @param group group
046         * @param conf job configuration.
047         * @throws IOException thrown if normalization can not be done properly.
048         */
049        public static void normalizeAppPath(String user, String group, Configuration conf) throws IOException {
050            if (user == null) {
051                throw new IllegalArgumentException("user cannot be null");
052            }
053    
054            if (group == null) {
055                throw new IllegalArgumentException("group cannot be null");
056            }
057    
058            if (conf.get(XOozieClient.IS_PROXY_SUBMISSION) != null) { // do nothing for proxy submission job;
059                return;
060            }
061    
062            String wfPathStr = conf.get(OozieClient.APP_PATH);
063            String coordPathStr = conf.get(OozieClient.COORDINATOR_APP_PATH);
064            String bundlePathStr = conf.get(OozieClient.BUNDLE_APP_PATH);
065            String appPathStr = wfPathStr != null ? wfPathStr : (coordPathStr != null ? coordPathStr : bundlePathStr);
066    
067            FileSystem fs = null;
068            try {
069                fs = Services.get().get(HadoopAccessorService.class).createFileSystem(user, group, new Path(appPathStr).toUri(), conf);
070            }
071            catch (HadoopAccessorException ex) {
072                throw new IOException(ex.getMessage());
073            }
074    
075            Path appPath = new Path(appPathStr);
076            String normalizedAppPathStr = appPathStr;
077            if (!fs.exists(appPath)) {
078                throw new IOException("Error: " + appPathStr + " does not exist");
079            }
080    
081            if (wfPathStr != null) {
082                conf.set(OozieClient.APP_PATH, normalizedAppPathStr);
083            }
084            else if (coordPathStr != null) {
085                conf.set(OozieClient.COORDINATOR_APP_PATH, normalizedAppPathStr);
086            }
087            else if (bundlePathStr != null) {
088                conf.set(OozieClient.BUNDLE_APP_PATH, normalizedAppPathStr);
089            }
090        }
091    
092        /**
093         * This Function will parse the value of the changed values in key value manner. the change value would be
094         * key1=value1;key2=value2
095         *
096         * @param changeValue change value.
097         * @return This returns the hash with hash<[key1,value1],[key2,value2]>
098         * @throws CommandException thrown if changeValue cannot be parsed properly.
099         */
100        public static Map<String, String> parseChangeValue(String changeValue) throws CommandException {
101            if (changeValue == null || changeValue.trim().equalsIgnoreCase("")) {
102                throw new CommandException(ErrorCode.E1015, "change value can not be empty string or null");
103            }
104    
105            Map<String, String> map = new HashMap<String, String>();
106    
107            String[] tokens = changeValue.split(";");
108            for (String token : tokens) {
109                if (!token.contains("=")) {
110                    throw new CommandException(ErrorCode.E1015, changeValue,
111                            "change value must be name=value pair or name=(empty string)");
112                }
113    
114                String[] pair = token.split("=");
115                String key = pair[0];
116    
117                if (map.containsKey(key)) {
118                    throw new CommandException(ErrorCode.E1015, changeValue, "can not specify repeated change values on "
119                            + key);
120                }
121    
122                if (pair.length == 2) {
123                    map.put(key, pair[1]);
124                }
125                else if (pair.length == 1) {
126                    map.put(key, "");
127                }
128                else {
129                    throw new CommandException(ErrorCode.E1015, changeValue, "elements on " + key
130                            + " must be name=value pair or name=(empty string)");
131                }
132            }
133    
134            return map;
135        }
136    }