Allow to configure logback logger with env variables (#8998)

Allow to configure logback logger with env variables (#8998)

assembly/assembly-ide-war/pom.xml

@@ -56,6 +56,16 @@
             <groupId>org.eclipse.che.core</groupId>
             <artifactId>che-core-commons-j2ee</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.eclipse.che.core</groupId>
+            <artifactId>che-core-commons-logback</artifactId>
+            <exclusions>
+                <exclusion>
+                    <artifactId>che-core-api-core</artifactId>
+                    <groupId>org.eclipse.che.core</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
         <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>javax.servlet-api</artifactId>
@@ -112,6 +122,7 @@
                                 <!-- dependency is required just to overlay it's content -->
                                 <dep>org.eclipse.che:che-ide-gwt-app</dep>
                                 <dep>org.eclipse.che.core:che-core-commons-j2ee</dep>
+                                <dep>org.eclipse.che.core:che-core-commons-logback</dep>
                                 <dep>ch.qos.logback:logback-classic</dep>
                             </ignoredUnusedDeclaredDependencies>
                         </configuration>

core/commons/che-core-commons-logback/pom.xml

@@ -22,6 +22,14 @@
     <packaging>jar</packaging>
     <name>Che Core :: Commons :: Commons Logback</name>
     <dependencies>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-classic</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>ch.qos.logback</groupId>
+            <artifactId>logback-core</artifactId>
+        </dependency>
         <dependency>
             <groupId>javax.inject</groupId>
             <artifactId>javax.inject</artifactId>

core/commons/che-core-commons-logback/src/main/java/org/eclipse/che/commons/logback/EnvironmentVariablesLogLevelPropagator.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2012-2018 Red Hat, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *   Red Hat, Inc. - initial API and implementation
+ */
+package org.eclipse.che.commons.logback;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.Logger;
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.classic.spi.LoggerContextListener;
+import ch.qos.logback.core.spi.ContextAwareBase;
+import ch.qos.logback.core.spi.LifeCycle;
+import java.util.Arrays;
+
+/**
+ * Class searches environment variable CHE_LOGGER_CONFIG Value of this variable is expected in such
+ * format:
+ *
+ * <p>CHE_LOGGER_CONFIG=logger1_name=logger1_level,logger2_name=logger2_level
+ *
+ * <p>In case if some logger name or logger level are omitted this pair will be silently ignored.
+ */
+public class EnvironmentVariablesLogLevelPropagator extends ContextAwareBase
+    implements LoggerContextListener, LifeCycle {
+
+  private boolean isStarted;
+
+  @Override
+  public void start() {
+
+    String config = System.getenv("CHE_LOGGER_CONFIG");
+    if (config != null && !config.isEmpty()) {
+      Arrays.stream(config.split(",")).map(String::trim).forEach(this::setLoggerLevel);
+    }
+    isStarted = true;
+  }
+
+  private void setLoggerLevel(String loggerConfig) {
+    String[] parts = loggerConfig.split("=", 2);
+
+    if (parts.length < 2) {
+      return;
+    }
+    String loggerName = parts[0];
+    String levelStr = parts[1];
+
+    if (levelStr.isEmpty() || loggerName.isEmpty()) {
+      return;
+    }
+
+    loggerName = loggerName.trim();
+    levelStr = levelStr.trim();
+
+    LoggerContext lc = (LoggerContext) context;
+
+    Logger logger = lc.getLogger(loggerName);
+    if ("null".equalsIgnoreCase(levelStr)) {
+      logger.setLevel(null);
+    } else {
+      Level level = Level.toLevel(levelStr, null);
+      if (level != null) {
+        logger.setLevel(level);
+      }
+    }
+  }
+
+  @Override
+  public void stop() {
+    isStarted = false;
+  }
+
+  @Override
+  public boolean isStarted() {
+    return isStarted;
+  }
+
+  @Override
+  public boolean isResetResistant() {
+    return false;
+  }
+
+  @Override
+  public void onStart(LoggerContext context) {}
+
+  @Override
+  public void onReset(LoggerContext context) {}
+
+  @Override
+  public void onStop(LoggerContext context) {}
+
+  @Override
+  public void onLevelChange(Logger logger, Level level) {}
+}

wsagent/che-wsagent-core/pom.xml

@@ -91,6 +91,16 @@
             <groupId>org.eclipse.che.core</groupId>
             <artifactId>che-core-commons-lang</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.eclipse.che.core</groupId>
+            <artifactId>che-core-commons-logback</artifactId>
+            <exclusions>
+                <exclusion>
+                    <artifactId>che-core-api-core</artifactId>
+                    <groupId>org.eclipse.che.core</groupId>
+                </exclusion>
+            </exclusions>
+        </dependency>
         <dependency>
             <groupId>org.eclipse.che.core</groupId>
             <artifactId>che-core-commons-schedule</artifactId>
@@ -162,6 +172,7 @@
                                 <ignoredDependency>org.slf4j:jul-to-slf4j</ignoredDependency>
                                 <ignoredDependency>org.slf4j:jcl-over-slf4j</ignoredDependency>
                                 <ignoredDependency>org.slf4j:log4j-over-slf4j</ignoredDependency>
+                                <ignoredDependency>org.eclipse.che.core:che-core-commons-logback</ignoredDependency>
                             </ignoredDependencies>
                         </configuration>
                     </execution>