Added buffer option to logger

Improves performance greatly, however to
retain the information that could be potentially
lost we may want to do some signal trapping and
error handling to ensure logs are written to
the stream

docs/logger.md

@@ -6,6 +6,12 @@ The _logger_ middleware provides common log format support, as well as custom fo
 		connect.logger(),
 	);
 
+The logger also has built in buffering support to increase performance. When the `buffer` option is set to `true` it defaults to 1000 milliseconds, however you can specify your own duration. When using the `buffer` option log lines are not written to the stream immediately, they are buffered in an array, and flushed periodically.
+
+    connect.createServer(
+		connect.logger({ buffer: 2000 })
+	);
+
 A custom format can also be passed:
 
     connect.createServer(

examples/router/app.js

@@ -58,7 +58,7 @@ function main(app){
 var connect = require('./../../lib/connect');
 
 var server = connect.createServer(
-    connect.logger()
+    connect.logger({ buffer: true })
 );
 
 server.use("/users/", connect.router(user));

lib/connect/middleware/logger.js

@@ -5,13 +5,30 @@
  * MIT Licensed
  */
 
+/**
+ * Log buffer.
+ * 
+ * @type Array
+ */
+
+var buf = [];
+
+/**
+ * Default log buffer duration.
+ *
+ * @type Number
+ */
+
+var defaultBufferDuration = 1000;
+
 /**
  * Log requests with the given `options`.
  *
  * Options:
  *
  *   - `format`  Format string, see below for tokens
  *   - `stream`  Output stream, defaults to _stdout_
+ *   - `buffer`  Buffer duration, defaults to 1000ms when _true_
  *
  * Tokens:
  *
@@ -35,7 +52,23 @@ module.exports = function logger(options) {
     options = options || {};
 
     var fmt = process.connectEnv.logFormat || options.format,
-        stream = options.stream || process.stdout;
+        realStream = stream = options.stream || process.stdout,
+        buffer = options.buffer;
+
+    // Buffering support
+    if (buffer) {
+        setInterval(function(){
+            if (buf.length) {
+                realStream.write(buf.join(''), 'ascii');
+                buf.length = 0;
+            }
+        }, typeof buffer === 'number' ? buffer : defaultBufferDuration); 
+        stream = {
+            write: function(str){
+                buf.push(str);
+            }
+        };
+    }
 
     return function logger(req, res, next) {
         var start = +new Date,