Added logLevelFilter

lib/log4js-node.js

@@ -184,6 +184,10 @@ var appenderMakers = {
       layout = layoutMakers[config.layout.type](config.layout);
     }
     return consoleAppender(layout);
+  },
+  "logLevelFilter": function(config) {
+    var appender = appenderMakers[config.appender.type](config.appender);
+    return logLevelFilter(config.level, appender);
   }
 };
 
@@ -196,15 +200,20 @@ var layoutMakers = {
   }
 };
 
+function configureAppender(appenderConfig) {
+}
+
 function configureAppenders(appenderList) {
   log4js.clearAppenders();
   if (appenderList) {
-    appenderList.forEach(
-      function(appenderConfig) {
-        var appender = appenderMakers[appenderConfig.type](appenderConfig);
-        log4js.addAppender(appender, appenderConfig.category);
+    appenderList.forEach(function(appenderConfig) {
+      var appender = appenderMakers[appenderConfig.type](appenderConfig);
+      if (appender) {
+        log4js.addAppender(appender, appenderConfig.category);    
+      } else {
+        throw new Error("log4js configuration problem for "+sys.inspect(appenderConfig));
       }
-    );
+    });
   } else {
     log4js.addAppender(consoleAppender);
   }
@@ -263,6 +272,10 @@ Level.prototype.isLessThanOrEqualTo = function(otherLevel) {
   return this.level <= otherLevel.level;
 };
 
+Level.prototype.isGreaterThanOrEqualTo = function(otherLevel) {
+    return this.level >= otherLevel.level;
+};
+
 /**
  * Models a logging event.
  * @constructor
@@ -369,15 +382,9 @@ consoleAppender = function (layout) {
 fileAppender = function(file, layout) {
 	layout = layout || basicLayout;	
 	file = file || "log4js.log";	
-  var logFile;
   //waits are generally bad, but we need 
   //the file to be open before we start doing any writing.
-  posix
-    .open(file, process.O_APPEND | process.O_WRONLY | process.O_CREAT, 0644)
-    .addCallback(function(fileDescriptor) { logFile = fileDescriptor; })
-    .addErrback(function(err) { throw new Error("Could not open logfile "+file+", error was: "+sys.inspect(err)); })
-    .wait();
-    
+  var logFile = posix.open(file, process.O_APPEND | process.O_WRONLY | process.O_CREAT, 0644).wait();    
   //register ourselves as listeners for shutdown
   //so that we can close the file.
   //not entirely sure this is necessary, but still.
@@ -388,6 +395,15 @@ fileAppender = function(file, layout) {
   };
 };
 
+logLevelFilter = function(levelString, appender) {
+  var level = Level.toLevel(levelString);
+  return function(logEvent) {
+    if (logEvent.level.isGreaterThanOrEqualTo(level)) {
+      appender(logEvent);
+    }
+  }
+};
+
 /**
  * BasicLayout is a simple layout for storing the logs. The logs are stored
  * in following format:
@@ -596,6 +612,7 @@ Date.prototype.toFormattedString = function(format) {
 
 log4js.consoleAppender = consoleAppender;
 log4js.fileAppender = fileAppender;
+log4js.logLevelFilter = logLevelFilter;
 log4js.basicLayout = basicLayout;
 log4js.patternLayout = patternLayout;
 log4js.messagePassThroughLayout = messagePassThroughLayout;