Fixing issue #137

examples/smtp-appender.js

@@ -0,0 +1,43 @@
+//Note that smtp appender needs nodemailer to work.
+//If you haven't got nodemailer installed, you'll get cryptic
+//"cannot find module" errors when using the smtp appender
+var log4js = require('../lib/log4js')
+, log
+, logmailer
+, i = 0;
+log4js.configure({
+  "appenders": [
+    {
+      type: "console",
+      category: "test"
+    },
+    {
+      "type": "smtp",
+      "recipients": "logfilerecipient@logging.com",
+      "sendInterval": 5,
+      "transport": "SMTP",
+      "SMTP": {
+        "host": "smtp.gmail.com",
+        "secureConnection": true,
+        "port": 465,
+        "auth": {
+          "user": "someone@gmail",
+          "pass": "********************"
+        },
+        "debug": true
+      },
+      "category": "mailer"
+    }
+  ]
+});
+log = log4js.getLogger("test");
+logmailer = log4js.getLogger("mailer");
+
+function doTheLogging(x) {
+    log.info("Logging something %d", x);
+    logmailer.info("Logging something %d", x);
+}
+
+for ( ; i < 500; i++) {
+    doTheLogging(i);
+}

lib/appenders/smtp.js

@@ -1,6 +1,6 @@
 var layouts = require("../layouts"),
-	mailer = require("nodemailer"),
+mailer = require("nodemailer"),
-	os = require('os');
+os = require('os');
 
 /**
 * SMTP Appender. Sends logging events using SMTP protocol. 
@@ -17,12 +17,13 @@ function smtpAppender(config, layout) {
 	
 	var logEventBuffer = [];
 	var sendTimer;
-	var transport = mailer.createTransport(config.transport, config[config.transport]);
 	
 	function sendBuffer() {
-		if (logEventBuffer.length == 0)
+	  if (logEventBuffer.length == 0) {
 			return;
+    }
 		
+		var transport = mailer.createTransport(config.transport, config[config.transport]);
 		var firstEvent = logEventBuffer[0];
 		var body = "";
 		while (logEventBuffer.length > 0) {
@@ -35,29 +36,33 @@ function smtpAppender(config, layout) {
 				text: body,
 				headers: {"Hostname": os.hostname()}
 			};
-		if (config.sender)
+		if (config.sender) {
 			msg.from = config.sender;
+    }
 		transport.sendMail(msg, function(error, success) {
 			if (error) {
 				console.error("log4js.smtpAppender - Error happened ", error);
 			}
+      transport.close();
 		});
 	}
 	
 	function scheduleSend() {
-		if (!sendTimer)
+		if (!sendTimer) {
 			sendTimer = setTimeout(function() {
 				sendTimer = null; 
 				sendBuffer();
 			}, sendInterval);
+    }
 	}
 	
 	return function(loggingEvent) {
 		logEventBuffer.push(loggingEvent);
-		if (sendInterval > 0)
+		if (sendInterval > 0) {
 			scheduleSend();
-		else
+		} else {
 			sendBuffer();
+    }
 	};
 }