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apache / logging-log4j-site / 9755b12b39efbc0142688f9b1a11ec68db89f97b / . / 2.13.2 / log4j-core / apidocs / src-html / org / apache / logging / log4j / core / config / HttpWatcher.html
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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache license, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License. You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the license for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the license.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>package org.apache.logging.log4j.core.config;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.io.ByteArrayOutputStream;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.InputStream;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.net.HttpURLConnection;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.net.MalformedURLException;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.net.URL;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.List;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.logging.log4j.Logger;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.logging.log4j.core.config.plugins.Plugin;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import org.apache.logging.log4j.core.config.plugins.PluginAliases;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import org.apache.logging.log4j.core.net.UrlConnectionFactory;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import org.apache.logging.log4j.core.net.ssl.SslConfiguration;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.logging.log4j.core.net.ssl.SslConfigurationFactory;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.logging.log4j.core.util.AbstractWatcher;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.logging.log4j.core.util.Source;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.logging.log4j.core.util.Watcher;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.logging.log4j.status.StatusLogger;<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>/**<a name="line.38"></a>
<span class="sourceLineNo">039</span> *<a name="line.39"></a>
<span class="sourceLineNo">040</span> */<a name="line.40"></a>
<span class="sourceLineNo">041</span>@Plugin(name = "http", category = Watcher.CATEGORY, elementType = Watcher.ELEMENT_TYPE, printObject = true)<a name="line.41"></a>
<span class="sourceLineNo">042</span>@PluginAliases("https")<a name="line.42"></a>
<span class="sourceLineNo">043</span>public class HttpWatcher extends AbstractWatcher {<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span> private Logger LOGGER = StatusLogger.getLogger();<a name="line.45"></a>
<span class="sourceLineNo">046</span><a name="line.46"></a>
<span class="sourceLineNo">047</span> private SslConfiguration sslConfiguration;<a name="line.47"></a>
<span class="sourceLineNo">048</span> private URL url;<a name="line.48"></a>
<span class="sourceLineNo">049</span> private volatile long lastModifiedMillis;<a name="line.49"></a>
<span class="sourceLineNo">050</span> private static final int NOT_MODIFIED = 304;<a name="line.50"></a>
<span class="sourceLineNo">051</span> private static final int OK = 200;<a name="line.51"></a>
<span class="sourceLineNo">052</span> private static final int BUF_SIZE = 1024;<a name="line.52"></a>
<span class="sourceLineNo">053</span> private static final String HTTP = "http";<a name="line.53"></a>
<span class="sourceLineNo">054</span> private static final String HTTPS = "https";<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span> public HttpWatcher(final Configuration configuration, final Reconfigurable reconfigurable,<a name="line.56"></a>
<span class="sourceLineNo">057</span> final List&lt;ConfigurationListener&gt; configurationListeners, long lastModifiedMillis) {<a name="line.57"></a>
<span class="sourceLineNo">058</span> super(configuration, reconfigurable, configurationListeners);<a name="line.58"></a>
<span class="sourceLineNo">059</span> sslConfiguration = SslConfigurationFactory.getSslConfiguration();<a name="line.59"></a>
<span class="sourceLineNo">060</span> this.lastModifiedMillis = lastModifiedMillis;<a name="line.60"></a>
<span class="sourceLineNo">061</span> }<a name="line.61"></a>
<span class="sourceLineNo">062</span><a name="line.62"></a>
<span class="sourceLineNo">063</span> @Override<a name="line.63"></a>
<span class="sourceLineNo">064</span> public long getLastModified() {<a name="line.64"></a>
<span class="sourceLineNo">065</span> return lastModifiedMillis;<a name="line.65"></a>
<span class="sourceLineNo">066</span> }<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span> @Override<a name="line.68"></a>
<span class="sourceLineNo">069</span> public boolean isModified() {<a name="line.69"></a>
<span class="sourceLineNo">070</span> return refreshConfiguration();<a name="line.70"></a>
<span class="sourceLineNo">071</span> }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span> @Override<a name="line.73"></a>
<span class="sourceLineNo">074</span> public void watching(Source source) {<a name="line.74"></a>
<span class="sourceLineNo">075</span> if (!source.getURI().getScheme().equals(HTTP) &amp;&amp; !source.getURI().getScheme().equals(HTTPS)) {<a name="line.75"></a>
<span class="sourceLineNo">076</span> throw new IllegalArgumentException(<a name="line.76"></a>
<span class="sourceLineNo">077</span> "HttpWatcher requires a url using the HTTP or HTTPS protocol, not " + source.getURI().getScheme());<a name="line.77"></a>
<span class="sourceLineNo">078</span> }<a name="line.78"></a>
<span class="sourceLineNo">079</span> try {<a name="line.79"></a>
<span class="sourceLineNo">080</span> url = source.getURI().toURL();<a name="line.80"></a>
<span class="sourceLineNo">081</span> } catch (MalformedURLException ex) {<a name="line.81"></a>
<span class="sourceLineNo">082</span> throw new IllegalArgumentException("Invalid URL for HttpWatcher " + source.getURI(), ex);<a name="line.82"></a>
<span class="sourceLineNo">083</span> }<a name="line.83"></a>
<span class="sourceLineNo">084</span> super.watching(source);<a name="line.84"></a>
<span class="sourceLineNo">085</span> }<a name="line.85"></a>
<span class="sourceLineNo">086</span><a name="line.86"></a>
<span class="sourceLineNo">087</span> @Override<a name="line.87"></a>
<span class="sourceLineNo">088</span> public Watcher newWatcher(Reconfigurable reconfigurable, List&lt;ConfigurationListener&gt; listeners,<a name="line.88"></a>
<span class="sourceLineNo">089</span> long lastModifiedMillis) {<a name="line.89"></a>
<span class="sourceLineNo">090</span> HttpWatcher watcher = new HttpWatcher(getConfiguration(), reconfigurable, listeners, lastModifiedMillis);<a name="line.90"></a>
<span class="sourceLineNo">091</span> if (getSource() != null) {<a name="line.91"></a>
<span class="sourceLineNo">092</span> watcher.watching(getSource());<a name="line.92"></a>
<span class="sourceLineNo">093</span> }<a name="line.93"></a>
<span class="sourceLineNo">094</span> return watcher;<a name="line.94"></a>
<span class="sourceLineNo">095</span> }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span> private boolean refreshConfiguration() {<a name="line.97"></a>
<span class="sourceLineNo">098</span> try {<a name="line.98"></a>
<span class="sourceLineNo">099</span> final HttpURLConnection urlConnection = UrlConnectionFactory.createConnection(url, lastModifiedMillis,<a name="line.99"></a>
<span class="sourceLineNo">100</span> sslConfiguration);<a name="line.100"></a>
<span class="sourceLineNo">101</span> urlConnection.connect();<a name="line.101"></a>
<span class="sourceLineNo">102</span><a name="line.102"></a>
<span class="sourceLineNo">103</span> try {<a name="line.103"></a>
<span class="sourceLineNo">104</span> int code = urlConnection.getResponseCode();<a name="line.104"></a>
<span class="sourceLineNo">105</span> switch (code) {<a name="line.105"></a>
<span class="sourceLineNo">106</span> case NOT_MODIFIED: {<a name="line.106"></a>
<span class="sourceLineNo">107</span> LOGGER.debug("Configuration Not Modified");<a name="line.107"></a>
<span class="sourceLineNo">108</span> return false;<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span> case OK: {<a name="line.110"></a>
<span class="sourceLineNo">111</span> try (InputStream is = urlConnection.getInputStream()) {<a name="line.111"></a>
<span class="sourceLineNo">112</span> ConfigurationSource configSource = getConfiguration().getConfigurationSource();<a name="line.112"></a>
<span class="sourceLineNo">113</span> configSource.setData(readStream(is));<a name="line.113"></a>
<span class="sourceLineNo">114</span> lastModifiedMillis = urlConnection.getLastModified();<a name="line.114"></a>
<span class="sourceLineNo">115</span> configSource.setModifiedMillis(lastModifiedMillis);<a name="line.115"></a>
<span class="sourceLineNo">116</span> LOGGER.debug("Content was modified for {}", url.toString());<a name="line.116"></a>
<span class="sourceLineNo">117</span> return true;<a name="line.117"></a>
<span class="sourceLineNo">118</span> } catch (final IOException e) {<a name="line.118"></a>
<span class="sourceLineNo">119</span> try (InputStream es = urlConnection.getErrorStream()) {<a name="line.119"></a>
<span class="sourceLineNo">120</span> LOGGER.info("Error accessing configuration at {}: {}", url, readStream(es));<a name="line.120"></a>
<span class="sourceLineNo">121</span> } catch (final IOException ioe) {<a name="line.121"></a>
<span class="sourceLineNo">122</span> LOGGER.error("Error accessing configuration at {}: {}", url, e.getMessage());<a name="line.122"></a>
<span class="sourceLineNo">123</span> }<a name="line.123"></a>
<span class="sourceLineNo">124</span> return false;<a name="line.124"></a>
<span class="sourceLineNo">125</span> }<a name="line.125"></a>
<span class="sourceLineNo">126</span> }<a name="line.126"></a>
<span class="sourceLineNo">127</span> default: {<a name="line.127"></a>
<span class="sourceLineNo">128</span> if (code &lt; 0) {<a name="line.128"></a>
<span class="sourceLineNo">129</span> LOGGER.info("Invalid response code returned");<a name="line.129"></a>
<span class="sourceLineNo">130</span> } else {<a name="line.130"></a>
<span class="sourceLineNo">131</span> LOGGER.info("Unexpected response code returned {}", code);<a name="line.131"></a>
<span class="sourceLineNo">132</span> }<a name="line.132"></a>
<span class="sourceLineNo">133</span> return false;<a name="line.133"></a>
<span class="sourceLineNo">134</span> }<a name="line.134"></a>
<span class="sourceLineNo">135</span> }<a name="line.135"></a>
<span class="sourceLineNo">136</span> } catch (final IOException ioe) {<a name="line.136"></a>
<span class="sourceLineNo">137</span> LOGGER.error("Error accessing configuration at {}: {}", url, ioe.getMessage());<a name="line.137"></a>
<span class="sourceLineNo">138</span> }<a name="line.138"></a>
<span class="sourceLineNo">139</span> } catch (final IOException ioe) {<a name="line.139"></a>
<span class="sourceLineNo">140</span> LOGGER.error("Error connecting to configuration at {}: {}", url, ioe.getMessage());<a name="line.140"></a>
<span class="sourceLineNo">141</span> }<a name="line.141"></a>
<span class="sourceLineNo">142</span> return false;<a name="line.142"></a>
<span class="sourceLineNo">143</span> }<a name="line.143"></a>
<span class="sourceLineNo">144</span><a name="line.144"></a>
<span class="sourceLineNo">145</span> private byte[] readStream(InputStream is) throws IOException {<a name="line.145"></a>
<span class="sourceLineNo">146</span> ByteArrayOutputStream result = new ByteArrayOutputStream();<a name="line.146"></a>
<span class="sourceLineNo">147</span> byte[] buffer = new byte[BUF_SIZE];<a name="line.147"></a>
<span class="sourceLineNo">148</span> int length;<a name="line.148"></a>
<span class="sourceLineNo">149</span> while ((length = is.read(buffer)) != -1) {<a name="line.149"></a>
<span class="sourceLineNo">150</span> result.write(buffer, 0, length);<a name="line.150"></a>
<span class="sourceLineNo">151</span> }<a name="line.151"></a>
<span class="sourceLineNo">152</span> return result.toByteArray();<a name="line.152"></a>
<span class="sourceLineNo">153</span> }<a name="line.153"></a>
<span class="sourceLineNo">154</span>}<a name="line.154"></a>
</pre>
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