Merge pull request #195 from jengler/flush-on-exit

Flush on exit

.gitignore

@@ -4,3 +4,4 @@ build
 node_modules
 .bob/
 test/streams/test-rolling-file-stream*
+test/streams/test-rolling-stream-with-existing-files*

lib/appenders/file.js

@@ -62,12 +62,7 @@ function fileAppender (file, layout, logSize, numBackups) {
   openFiles.push(logFile);
   
   return function(loggingEvent) {
-    logFile.write(layout(loggingEvent) + eol, "utf8", 
-                  function() { 
-                    // just here to keep the event loop
-                    // open  - doesn't work.
-                    return; 
-                  });
+    logFile.write(layout(loggingEvent) + eol, "utf8");
   };
 }
 

lib/log4js.js

@@ -50,12 +50,14 @@ var events = require('events')
 , util = require('util')
 , layouts = require('./layouts')
 , levels = require('./levels')
-, LoggingEvent = require('./logger').LoggingEvent
-, Logger = require('./logger').Logger
+, loggerModule = require('./logger')
+, LoggingEvent = loggerModule.LoggingEvent
+, Logger = loggerModule.Logger
 , ALL_CATEGORIES = '[all]'
 , appenders = {}
 , loggers = {}
 , appenderMakers = {}
+, appenderShutdowns = {}
 , defaultConfig =   {
   appenders: [
     { type: "console" }
@@ -299,24 +301,39 @@ function loadAppender(appender) {
     appenderModule = require(appender);
   }
   module.exports.appenders[appender] = appenderModule.appender.bind(appenderModule);
+  if (appenderModule.shutdown) {
+    appenderShutdowns[appender] = appenderModule.shutdown.bind(appenderModule);
+  }
   appenderMakers[appender] = appenderModule.configure.bind(appenderModule);
 }
 
+/**
+ * Shutdown all log appenders. This will first disable all writing to appenders
+ * and then call the shutdown function each appender.
+ *
+ * @params {Function} cb - The callback to be invoked once all appenders have
+ *  shutdown. If an error occurs, the callback will be given the error object
+ *  as the first argument.
+ * @returns {void}
+ */
 function shutdown(cb) {
-  var allAppenders = Object.keys(appenders).reduce(
+  // First, disable all writing to appenders. This prevents appenders from
+  // not being able to be drained because of run-away log writes.
+  loggerModule.disableAllLogWrites();
+
+  // Next, get all the shutdown functions for appenders as an array.
+  var shutdownFunctions = Object.keys(appenderShutdowns).reduce(
     function(accum, category) {
-      return accum.concat(appenders[category]);
+      return accum.concat(appenderShutdowns[category]);
     }, []);
+
+  // Call each of the shutdown functions.
   async.forEach(
-    allAppenders,
-    function(appender, done) {
-      if (appender.shutdown) {
-        appender.shutdown(done);
-      } else {
-        done();
-      }
+    shutdownFunctions,
+    function(shutdownFn, done) {
+      shutdownFn(done);
     },
-    function() { process.nextTick(cb); }
+		cb
   );
 }
 

lib/logger.js

@@ -4,6 +4,8 @@ var levels = require('./levels')
 , events = require('events')
 , DEFAULT_CATEGORY = '[default]';
 
+var logWritesEnabled = true;
+
 /**
  * Models a logging event.
  * @constructor
@@ -66,7 +68,7 @@ Logger.prototype.isLevelEnabled = function(otherLevel) {
     };
     
     Logger.prototype[levelString.toLowerCase()] = function () {
-      if (this.isLevelEnabled(level)) {
+      if (logWritesEnabled && this.isLevelEnabled(level)) {
         var args = Array.prototype.slice.call(arguments);
         args.unshift(level);
         Logger.prototype.log.apply(this, args);
@@ -75,6 +77,23 @@ Logger.prototype.isLevelEnabled = function(otherLevel) {
   }
 );
 
+/**
+ * Disable all log writes.
+ * @returns {void}
+ */
+function disableAllLogWrites() {
+  logWritesEnabled = false;
+}
+
+/**
+ * Enable log writes.
+ * @returns {void}
+ */
+function enableAllLogWrites() {
+  logWritesEnabled = true;
+}
 
 exports.LoggingEvent = LoggingEvent;
 exports.Logger = Logger;
+exports.disableAllLogWrites = disableAllLogWrites;
+exports.enableAllLogWrites = enableAllLogWrites;

test/dateFileAppender-test.js

@@ -4,7 +4,8 @@ var vows = require('vows')
 , path = require('path')
 , fs = require('fs')
 , sandbox = require('sandboxed-module')
-, log4js = require('../lib/log4js');
+, log4js = require('../lib/log4js')
+, EOL = require('os').EOL || '\n';
 
 function removeFile(filename) {
   return function() {
@@ -134,7 +135,10 @@ vows.describe('../lib/appenders/dateFile').addBatch({
       teardown: removeFile('date-file-test.log'),
       
       'should load appender configuration from a json file': function(err, contents) {
-        assert.include(contents, 'this should be written to the file' + require('os').EOL);
+        if (err) {
+          throw err;
+        }
+        assert.include(contents, 'this should be written to the file' + EOL);
         assert.equal(contents.indexOf('this should not be written to the file'), -1);
       }
     },
@@ -161,7 +165,7 @@ vows.describe('../lib/appenders/dateFile').addBatch({
         , thisTime = format.asString(options.appenders[0].pattern, new Date());
         fs.writeFileSync(
           path.join(__dirname, 'date-file-test' + thisTime), 
-          "this is existing data" + require('os').EOL, 
+          "this is existing data" + EOL,
           'utf8'
         );
         log4js.clearAppenders();

test/logger-test.js

@@ -2,7 +2,8 @@
 var vows = require('vows')
 , assert = require('assert')
 , levels = require('../lib/levels')
-, Logger = require('../lib/logger').Logger;
+, loggerModule = require('../lib/logger')
+, Logger = loggerModule.Logger;
 
 vows.describe('../lib/logger').addBatch({
   'constructor with no parameters': {
@@ -53,5 +54,28 @@ vows.describe('../lib/logger').addBatch({
       assert.isTrue(logger.isErrorEnabled());
       assert.isTrue(logger.isFatalEnabled());
     }
+  },
+
+  'should emit log events': {
+    topic: function() {
+      var events = [],
+          logger = new Logger();
+      logger.addListener('log', function (logEvent) { events.push(logEvent); });
+      logger.debug('Event 1');
+      loggerModule.disableAllLogWrites();
+      logger.debug('Event 2');
+      loggerModule.enableAllLogWrites();
+      logger.debug('Event 3');
+      return events;
+    },
+
+    'when log writes are enabled': function(events) {
+      assert.equal(events[0].data[0], 'Event 1');
+    },
+
+    'but not when log writes are disabled': function(events) {
+      assert.equal(events.length, 2);
+      assert.equal(events[1].data[0], 'Event 3');
+    }
   }
 }).exportTo(module);

test/logging-test.js

@@ -75,13 +75,65 @@ vows.describe('log4js').addBatch({
         assert.equal(events[1].level.toString(), 'WARN');
       },
       
-      'should include the error if passed in': function (events) {
+      'should include the error if passed in': function(events) {
         assert.instanceOf(events[2].data[1], Error);
         assert.equal(events[2].data[1].message, 'Pants are on fire!');
       }
-      
+    }
+  },
+
+  'when shutdown is called': {
+    topic: function() {
+      var events = {
+       appenderShutdownCalled: false,
+       shutdownCallbackCalled: false
+      },
+      log4js = sandbox.require(
+        '../lib/log4js',
+        {
+          requires: {
+            './appenders/file':
+            {
+              name: "file",
+              appender: function() {},
+              configure: function(configuration) {
+                return function() {};
+              },
+              shutdown: function(cb) {
+                events.appenderShutdownCalled = true;
+                cb();
+              }
+            }
+          }
+        }
+      ),
+      shutdownCallback = function() {
+        events.shutdownCallbackCalled = true;
+      },
+      config = { appenders:
+                 [ { "type" : "file",
+                     "filename" : "cheesy-wotsits.log",
+                     "maxLogSize" : 1024,
+                     "backups" : 3
+                   }
+                 ]
+               };
+
+      log4js.configure(config);
+      log4js.shutdown(shutdownCallback);
+      // Re-enable log writing so other tests that use logger are not
+      // affected.
+      require('../lib/logger').enableAllLogWrites();
+      return events;
     },
-    
+
+    'should invoke appender shutdowns': function(events) {
+      assert.ok(events.appenderShutdownCalled);
+    },
+
+    'should call callback': function(events) {
+      assert.ok(events.shutdownCallbackCalled);
+    }
   },
   
   'invalid configuration': {