| /* |
| * 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.hadoop.chukwa.util; |
| |
| import java.nio.charset.Charset; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.regex.Pattern; |
| import java.util.regex.PatternSyntaxException; |
| |
| import org.apache.commons.lang.ArrayUtils; |
| import org.apache.hadoop.chukwa.Chunk; |
| import org.apache.hadoop.chukwa.extraction.engine.RecordUtil; |
| import org.apache.hadoop.chukwa.util.RegexUtil.CheckedPatternSyntaxException; |
| import org.apache.log4j.Logger; |
| |
| |
| public class Filter { |
| |
| static Logger log = Logger.getLogger(Filter.class); |
| |
| private static final String[] SEARCH_TARGS = |
| {"datatype", "name", "host", "cluster", "content"}; |
| static final String SEPARATOR="&"; |
| |
| private static class SearchRule { |
| Pattern p; |
| String targ; |
| |
| SearchRule(Pattern p, String t) { |
| this.p = p; |
| this.targ = t; |
| } |
| |
| boolean matches(Chunk chunk) { |
| if(targ.equals("datatype")) { |
| return p.matcher(chunk.getDataType()).matches(); |
| } else if(targ.equals("name")) { |
| return p.matcher(chunk.getStreamName()).matches(); |
| } else if(targ.equals("host")) { |
| return p.matcher(chunk.getSource()).matches(); |
| } else if(targ.equals("cluster")) { |
| String cluster = RecordUtil.getClusterName(chunk); |
| return p.matcher(cluster).matches(); |
| } else if(targ.equals("content")) { |
| String content = new String(chunk.getData(), Charset.forName("UTF-8")); |
| return p.matcher(content).matches(); |
| } else if(targ.startsWith("tags.")) { |
| String tagName = targ.substring("tags.".length()); |
| if (!RegexUtil.isRegex(tagName)) { |
| log.warn("Error parsing 'tagName' as a regex: " |
| + RegexUtil.regexError(tagName)); |
| return false; |
| } |
| String tagVal = chunk.getTag(tagName); |
| if(tagVal == null) |
| return false; |
| return p.matcher(tagVal).matches(); |
| } else { |
| assert false: "unknown target: " +targ; |
| return false; |
| } |
| } |
| |
| public String toString() { |
| return targ + "=" +p.toString(); |
| } |
| } |
| |
| List<SearchRule> compiledPatterns; |
| |
| public Filter(String listOfPatterns) throws CheckedPatternSyntaxException { |
| compiledPatterns = new ArrayList<SearchRule>(); |
| //FIXME: could escape these |
| String[] patterns = listOfPatterns.split(SEPARATOR); |
| for(String p: patterns) { |
| int equalsPos = p.indexOf('='); |
| |
| if(equalsPos < 0 || equalsPos > (p.length() -2)) { |
| throw new CheckedPatternSyntaxException( |
| "pattern must be of form targ=pattern", p, -1); |
| } |
| |
| String targ = p.substring(0, equalsPos); |
| if(!targ.startsWith("tags.") && !ArrayUtils.contains(SEARCH_TARGS, targ)) { |
| throw new CheckedPatternSyntaxException( |
| "pattern doesn't start with recognized search target", p, -1); |
| } |
| |
| String regex = p.substring(equalsPos+1); |
| if (!RegexUtil.isRegex(regex)) { |
| throw new CheckedPatternSyntaxException(RegexUtil.regexException(regex)); |
| } |
| |
| Pattern pat = Pattern.compile(regex, Pattern.DOTALL); |
| compiledPatterns.add(new SearchRule(pat, targ)); |
| } |
| } |
| |
| public boolean matches(Chunk chunk) { |
| for(SearchRule r: compiledPatterns) { |
| if(!r.matches(chunk)) |
| return false; |
| } |
| return true; |
| } |
| |
| int size() { |
| return compiledPatterns.size(); |
| } |
| |
| public String toString() { |
| StringBuilder sb = new StringBuilder(); |
| sb.append(compiledPatterns.get(0)); |
| for(int i=1; i < compiledPatterns.size(); ++i) { |
| sb.append(" & "); |
| sb.append(compiledPatterns.get(i)); |
| } |
| return sb.toString(); |
| } |
| |
| private static final class MatchAll extends Filter { |
| public MatchAll() throws CheckedPatternSyntaxException { |
| super("datatype=.*"); |
| } |
| |
| public boolean matches(Chunk c) { |
| return true; |
| } |
| |
| public String toString() { |
| return "ALL"; |
| } |
| } |
| |
| public static final Filter ALL = newMatchAll(); |
| private static Filter newMatchAll() { |
| try { |
| return new MatchAll(); |
| } catch (CheckedPatternSyntaxException e) { |
| throw new RuntimeException("Illegal MatchAll regular expression.", e); |
| } |
| } |
| |
| }//end class |