Merge "Support for error_log in .json format."

Documentation/config-gerrit.txt

@@ -2654,6 +2654,22 @@ are specified in the link:#container[container section]:
   javaOptions = -Dcom.sun.jndi.ldap.connect.pool.timeout=300000
 ----
 
+[[log]]
+=== Section log
+
+[[log.jsonLogging]]log.jsonLogging::
++
+If set to true, enables error logging in JSON format (file name: "logs/error_log.json").
++
+Defaults to false.
+
+[[log.textLogging]]log.textLogging::
++
+If set to true, enables error logging in regular plain text format. Can only be disabled
+if `jsonLogging` is enabled.
++
+Defaults to true.
+
 [[mimetype]]
 === Section mimetype
 

gerrit-pgm/BUCK

@@ -18,7 +18,8 @@ DEPS = [
     '//lib/guice:guice-servlet',
     '//lib/jgit:jgit',
     '//lib/log:api',
-    '//lib/log:log4j',
+    '//lib/log:jsonevent-layout',
+    '//lib/log:log4j'
 ]
 
 java_library(

gerrit-pgm/src/main/java/com/google/gerrit/pgm/Daemon.java

@@ -197,10 +197,6 @@ public class Daemon extends SiteProgram {
       throw die("No services enabled, nothing to do");
     }
 
-    if (!consoleLog) {
-      manager.add(ErrorLogFile.start(getSitePath()));
-    }
-
     try {
       start();
       RuntimeShutdown.add(new Runnable() {
@@ -273,7 +269,7 @@ public class Daemon extends SiteProgram {
   }
 
   @VisibleForTesting
-  public void start() {
+  public void start() throws IOException {
     if (dbInjector == null) {
       dbInjector = createDbInjector(MULTI_USER);
     }
@@ -283,6 +279,11 @@ public class Daemon extends SiteProgram {
       .setDbCfgInjector(dbInjector, cfgInjector);
     manager.add(dbInjector, cfgInjector, sysInjector);
 
+    if (!consoleLog) {
+      manager.add(ErrorLogFile.start(getSitePath(),
+          cfgInjector.getInstance(Key.get(Config.class, GerritServerConfig.class))));
+    }
+
     sshd &= !sshdOff();
     if (sshd) {
       initSshd();

gerrit-pgm/src/main/java/com/google/gerrit/pgm/util/ErrorLogFile.java

@@ -19,17 +19,21 @@ import com.google.gerrit.extensions.events.LifecycleListener;
 import com.google.gerrit.server.config.SitePaths;
 import com.google.gerrit.server.util.SystemLog;
 
+import net.logstash.log4j.JSONEventLayoutV1;
+
 import org.apache.log4j.ConsoleAppender;
 import org.apache.log4j.Level;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
 import org.apache.log4j.PatternLayout;
+import org.eclipse.jgit.lib.Config;
 
 import java.io.IOException;
 import java.nio.file.Path;
 
 public class ErrorLogFile {
   static final String LOG_NAME = "error_log";
+  static final String JSON_SUFFIX = ".json";
 
   public static void errorOnlyConsole() {
     LogManager.resetConfiguration();
@@ -47,12 +51,12 @@ public class ErrorLogFile {
     root.addAppender(dst);
   }
 
-  public static LifecycleListener start(final Path sitePath)
+  public static LifecycleListener start(final Path sitePath, final Config config)
       throws IOException {
     Path logdir = FileUtil.mkdirsOrDie(new SitePaths(sitePath).logs_dir,
         "Cannot create log directory");
     if (SystemLog.shouldConfigure()) {
-      initLogSystem(logdir);
+      initLogSystem(logdir, config);
     }
 
     return new LifecycleListener() {
@@ -67,10 +71,21 @@ public class ErrorLogFile {
     };
   }
 
-  private static void initLogSystem(Path logdir) {
+  private static void initLogSystem(Path logdir, Config config) {
     final Logger root = LogManager.getRootLogger();
     root.removeAllAppenders();
+
+    boolean json = config.getBoolean("log", "jsonLogging", false);
+    boolean text = config.getBoolean("log", "textLogging", true) || !json;
+
+    if (text) {
       root.addAppender(SystemLog.createAppender(logdir, LOG_NAME,
           new PatternLayout("[%d] %-5p %c %x: %m%n")));
     }
+
+    if (json) {
+      root.addAppender(SystemLog.createAppender(logdir, LOG_NAME + JSON_SUFFIX,
+          new JSONEventLayoutV1()));
+    }
+  }
 }