add nolog operation

lib/connect-logger.js

@@ -37,13 +37,17 @@ function getLogger(logger4js, options) {
 
     var thislogger = logger4js
   , level = levels.toLevel(options.level, levels.INFO)
-  , fmt = options.format || ':remote-addr - - ":method :url HTTP/:http-version" :status :content-length ":referrer" ":user-agent"';
+  , fmt = options.format || ':remote-addr - - ":method :url HTTP/:http-version" :status :content-length ":referrer" ":user-agent"'
+  , nolog = options.nolog ? createNoLogCondition(options.nolog) : null;
 
     return function (req, res, next) {
 
 	// mount safety
 	if (req._logging) return next();
 
+  // nologs
+  if(nolog.test(req.url)) return next();
+
 	if (thislogger.isLevelEnabled(level)) {
 
 	    var start = +new Date
@@ -111,4 +115,53 @@ function format(str, req, res) {
 		            });
 }
 
+/**
+ * Return RegExp Object about nolog
+ *
+ * @param  {String} nolog
+ * @return {RegExp}
+ * @api private
+ */
+
+/**
+ * syntax
+ *  1. String
+ *   1.1 "\\.gif"
+ *         NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.gif?fuga
+ *         LOGGING http://example.com/hoge.agif
+ *   1.2 in "\\.gif|\\.jpg$"
+ *         NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.gif?fuga and http://example.com/hoge.jpg?fuga
+ *         LOGGING http://example.com/hoge.agif, http://example.com/hoge.ajpg and http://example.com/hoge.jpg?hoge
+ *   1.3 in "\\.(gif|jpe?g|png)$"
+ *         NOT LOGGING http://example.com/hoge.gif and http://example.com/hoge.jpeg
+ *         LOGGING http://example.com/hoge.gif?uid=2 and http://example.com/hoge.jpg?pid=3
+ *  2. RegExp
+ *   2.1 in /\.(gif|jpe?g|png)$/
+ *         SAME AS 1.3
+ *  3. Array
+ *   3.1 ["\\.jpg$", "\\.png", "\\.gif"]
+ *         SAME AS "\\.jpg|\\.png|\\.gif"
+ */
+function createNoLogCondition(nolog, type) {
+  if(!nolog) return null;
+  type = type || '';
+
+  if(nolog instanceof RegExp){
+    if(type === 'string')
+      return nolog.source;
+    return nolog;
+  } else if(typeof nolog === 'string'){
+    if(type === 'string')
+      return nolog;
+    try{
+      return new RegExp(nolog);
+    } catch (ex) {
+      return null;
+    }
+  } else if(nolog instanceof Array){
+    var regexps = nolog.map(function(o){ return createNoLogCondition(o, 'string')});
+    return new RegExp(regexps.join('|'));
+  }
+}
+
 exports.connectLogger = getLogger;