[ISSUE#6999] Solve the problem that Nacos client does not support logback overload log configuration

client/src/main/java/com/alibaba/nacos/client/logging/logback/LogbackNacosLogging.java

@@ -16,17 +16,21 @@
 
 package com.alibaba.nacos.client.logging.logback;
 
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
 import ch.qos.logback.classic.LoggerContext;
-import ch.qos.logback.classic.util.ContextInitializer;
+import ch.qos.logback.classic.spi.LoggerContextListener;
+import ch.qos.logback.core.CoreConstants;
 import com.alibaba.nacos.client.logging.AbstractNacosLogging;
 import com.alibaba.nacos.common.utils.ResourceUtils;
-import com.alibaba.nacos.common.utils.StringUtils;
 import org.slf4j.impl.StaticLoggerBinder;
 
 /**
  * Support for Logback version 1.0.8 or higher
  *
  * @author <a href="mailto:[email protected]">hxy1991</a>
+ * @author <a href="mailto:[email protected]">hujun</a>
+ *
  * @since 0.9.0
  */
 public class LogbackNacosLogging extends AbstractNacosLogging {
@@ -35,17 +39,52 @@ public class LogbackNacosLogging extends AbstractNacosLogging {
 
     @Override
     public void loadConfiguration() {
-        String location = getLocation(NACOS_LOGBACK_LOCATION);
-        if (StringUtils.isBlank(location)) {
-            return;
+        LoggerContext loggerContext = loadConfigurationOnStart();
+        if (loggerContext.getObject(CoreConstants.RECONFIGURE_ON_CHANGE_TASK) != null) {
+            addListener(loggerContext);
         }
-
+    }
+
+    private LoggerContext loadConfigurationOnStart() {
+        String location = getLocation(NACOS_LOGBACK_LOCATION);
         try {
             LoggerContext loggerContext = (LoggerContext) StaticLoggerBinder.getSingleton().getLoggerFactory();
-            new ContextInitializer(loggerContext).configureByResource(ResourceUtils.getResourceUrl(location));
+            NacosJoranConfigurator configurator = new NacosJoranConfigurator();
+            configurator.setContext(loggerContext);
+            configurator.doNacosConfigure(ResourceUtils.getResourceUrl(location));
+            return loggerContext;
         } catch (Exception e) {
             throw new IllegalStateException("Could not initialize Logback Nacos logging from " + location, e);
         }
     }
 
+    private void addListener(LoggerContext loggerContext) {
+        loggerContext.addListener(new LoggerContextListener() {
+            @Override
+            public boolean isResetResistant() {
+                return true;
+            }
+
+            @Override
+            public void onReset(LoggerContext context) {
+                loadConfigurationOnStart();
+            }
+
+            @Override
+            public void onStart(LoggerContext context) {
+
+            }
+
+            @Override
+            public void onStop(LoggerContext context) {
+
+            }
+
+            @Override
+            public void onLevelChange(Logger logger, Level level) {
+
+            }
+        });
+    }
+
 }

client/src/main/java/com/alibaba/nacos/client/logging/logback/NacosJoranConfigurator.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 1999-2018 Alibaba Group Holding Ltd.
+ *
+ * Licensed 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 com.alibaba.nacos.client.logging.logback;
+
+import ch.qos.logback.classic.joran.JoranConfigurator;
+import ch.qos.logback.core.joran.event.SaxEvent;
+import ch.qos.logback.core.joran.spi.JoranException;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.List;
+
+/**
+ * ensure that Nacos configuration does not affect user configuration savepoints and  scanning url.
+ *
+ * @author <a href="mailto:[email protected]">hujun</a>
+ * @see <a href="https://github.com/alibaba/nacos/issues/6999">#6999</a>
+ */
+public class NacosJoranConfigurator extends JoranConfigurator {
+
+    /**
+     * ensure that Nacos configuration does not affect user configuration savepoints.
+     *
+     * @param eventList safe data
+     */
+    @Override
+    public void registerSafeConfiguration(List<SaxEvent> eventList) {
+    }
+
+    /**
+     * ensure that Nacos configuration does not affect user configuration scanning url.
+     *
+     * @param url config url
+     * @throws JoranException e
+     */
+    public void doNacosConfigure(URL url) throws JoranException {
+        InputStream in = null;
+        try {
+            URLConnection urlConnection = url.openConnection();
+            urlConnection.setUseCaches(false);
+            in = urlConnection.getInputStream();
+            doConfigure(in, url.toExternalForm());
+        } catch (IOException ioe) {
+            String errMsg = "Could not open URL [" + url + "].";
+            addError(errMsg, ioe);
+            throw new JoranException(errMsg, ioe);
+        } finally {
+            if (in != null) {
+                try {
+                    in.close();
+                } catch (IOException ioe) {
+                    String errMsg = "Could not close input stream";
+                    addError(errMsg, ioe);
+                    throw new JoranException(errMsg, ioe);
+                }
+            }
+        }
+    }
+
+}

client/src/main/resources/nacos-logback.xml

@@ -15,8 +15,7 @@
   ~ limitations under the License.
   -->
 
-<configuration debug="false" scan="true" scanPeriod="30 seconds" packagingData="true">
-    <contextName>nacos</contextName>
+<configuration debug="false" scan="false"  packagingData="true">
 
     <appender name="CONFIG_LOG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
         <file>${JM.LOG.PATH}/nacos/config.log</file>