1 | /** |
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2 | * Licensed to the Apache Software Foundation (ASF) under one |
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3 | * or more contributor license agreements. See the NOTICE file |
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4 | * distributed with this work for additional information |
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5 | * regarding copyright ownership. The ASF licenses this file |
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6 | * to you under the Apache License, Version 2.0 (the |
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7 | * "License"); you may not use this file except in compliance |
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8 | * with the License. You may obtain a copy of the License at |
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9 | * |
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10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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11 | * |
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12 | * Unless required by applicable law or agreed to in writing, software |
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13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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15 | * See the License for the specific language governing permissions and |
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16 | * limitations under the License. |
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17 | */ |
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18 | package org.apache.hadoop.log; |
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19 | |
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20 | import java.io.*; |
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21 | import java.net.*; |
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22 | import java.util.regex.Pattern; |
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23 | |
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24 | import javax.servlet.*; |
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25 | import javax.servlet.http.*; |
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26 | |
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27 | import org.apache.commons.logging.*; |
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28 | import org.apache.commons.logging.impl.*; |
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29 | import org.apache.hadoop.util.ServletUtil; |
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30 | |
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31 | /** |
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32 | * Change log level in runtime. |
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33 | */ |
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34 | public class LogLevel { |
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35 | public static final String USAGES = "\nUSAGES:\n" |
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36 | + "java " + LogLevel.class.getName() |
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37 | + " -getlevel <host:port> <name>\n" |
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38 | + "java " + LogLevel.class.getName() |
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39 | + " -setlevel <host:port> <name> <level>\n"; |
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40 | |
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41 | /** |
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42 | * A command line implementation |
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43 | */ |
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44 | public static void main(String[] args) { |
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45 | if (args.length == 3 && "-getlevel".equals(args[0])) { |
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46 | process("http://" + args[1] + "/logLevel?log=" + args[2]); |
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47 | return; |
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48 | } |
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49 | else if (args.length == 4 && "-setlevel".equals(args[0])) { |
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50 | process("http://" + args[1] + "/logLevel?log=" + args[2] |
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51 | + "&level=" + args[3]); |
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52 | return; |
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53 | } |
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54 | |
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55 | System.err.println(USAGES); |
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56 | System.exit(-1); |
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57 | } |
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58 | |
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59 | private static void process(String urlstring) { |
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60 | try { |
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61 | URL url = new URL(urlstring); |
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62 | System.out.println("Connecting to " + url); |
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63 | URLConnection connection = url.openConnection(); |
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64 | connection.connect(); |
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65 | |
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66 | BufferedReader in = new BufferedReader(new InputStreamReader( |
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67 | connection.getInputStream())); |
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68 | for(String line; (line = in.readLine()) != null; ) |
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69 | if (line.startsWith(MARKER)) { |
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70 | System.out.println(TAG.matcher(line).replaceAll("")); |
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71 | } |
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72 | in.close(); |
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73 | } catch (IOException ioe) { |
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74 | System.err.println("" + ioe); |
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75 | } |
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76 | } |
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77 | |
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78 | static final String MARKER = "<!-- OUTPUT -->"; |
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79 | static final Pattern TAG = Pattern.compile("<[^>]*>"); |
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80 | |
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81 | /** |
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82 | * A servlet implementation |
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83 | */ |
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84 | public static class Servlet extends HttpServlet { |
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85 | private static final long serialVersionUID = 1L; |
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86 | |
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87 | public void doGet(HttpServletRequest request, HttpServletResponse response |
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88 | ) throws ServletException, IOException { |
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89 | PrintWriter out = ServletUtil.initHTML(response, "Log Level"); |
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90 | String logName = ServletUtil.getParameter(request, "log"); |
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91 | String level = ServletUtil.getParameter(request, "level"); |
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92 | |
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93 | if (logName != null) { |
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94 | out.println("<br /><hr /><h3>Results</h3>"); |
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95 | out.println(MARKER |
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96 | + "Submitted Log Name: <b>" + logName + "</b><br />"); |
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97 | |
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98 | Log log = LogFactory.getLog(logName); |
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99 | out.println(MARKER |
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100 | + "Log Class: <b>" + log.getClass().getName() +"</b><br />"); |
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101 | if (level != null) { |
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102 | out.println(MARKER + "Submitted Level: <b>" + level + "</b><br />"); |
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103 | } |
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104 | |
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105 | if (log instanceof Log4JLogger) { |
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106 | process(((Log4JLogger)log).getLogger(), level, out); |
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107 | } |
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108 | else if (log instanceof Jdk14Logger) { |
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109 | process(((Jdk14Logger)log).getLogger(), level, out); |
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110 | } |
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111 | else { |
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112 | out.println("Sorry, " + log.getClass() + " not supported.<br />"); |
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113 | } |
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114 | } |
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115 | |
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116 | out.println(FORMS); |
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117 | out.println(ServletUtil.HTML_TAIL); |
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118 | } |
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119 | |
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120 | static final String FORMS = "\n<br /><hr /><h3>Get / Set</h3>" |
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121 | + "\n<form>Log: <input type='text' size='50' name='log' /> " |
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122 | + "<input type='submit' value='Get Log Level' />" |
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123 | + "</form>" |
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124 | + "\n<form>Log: <input type='text' size='50' name='log' /> " |
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125 | + "Level: <input type='text' name='level' /> " |
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126 | + "<input type='submit' value='Set Log Level' />" |
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127 | + "</form>"; |
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128 | |
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129 | private static void process(org.apache.log4j.Logger log, String level, |
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130 | PrintWriter out) throws IOException { |
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131 | if (level != null) { |
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132 | log.setLevel(org.apache.log4j.Level.toLevel(level)); |
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133 | out.println(MARKER + "Setting Level to " + level + " ...<br />"); |
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134 | } |
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135 | out.println(MARKER |
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136 | + "Effective level: <b>" + log.getEffectiveLevel() + "</b><br />"); |
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137 | } |
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138 | |
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139 | private static void process(java.util.logging.Logger log, String level, |
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140 | PrintWriter out) throws IOException { |
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141 | if (level != null) { |
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142 | log.setLevel(java.util.logging.Level.parse(level)); |
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143 | out.println(MARKER + "Setting Level to " + level + " ...<br />"); |
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144 | } |
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145 | |
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146 | java.util.logging.Level lev; |
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147 | for(; (lev = log.getLevel()) == null; log = log.getParent()); |
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148 | out.println(MARKER + "Effective level: <b>" + lev + "</b><br />"); |
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149 | } |
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150 | } |
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151 | } |
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