Change logger to stream, decode HTML messages

- Using a WritableStream instead of manually buffering is a good idea
- Chat messages are logged with HTML entities decoded (< instead of &lt;)

channel.js

@@ -263,7 +263,7 @@ Channel.prototype.saveDump = function() {
     };
     var text = JSON.stringify(dump);
     fs.writeFileSync("chandump/" + this.name, text);
-    this.logger.flush();
+    this.logger.close();
 }
 
 // Save channel dumps every 5 minutes, in case of crash
@@ -1829,7 +1829,8 @@ Channel.prototype.sendMessage = function(username, msg, msgclass, data) {
     this.chatbuffer.push(msgobj);
     if(this.chatbuffer.length > 15)
         this.chatbuffer.shift();
-    this.logger.log("<" + username + "." + msgclass + "> " + msg);
+    var unescaped = sanitize(msg).entityDecode();
+    this.logger.log("<" + username + "." + msgclass + "> " + unescaped);
 };
 
 /* REGION Rank stuff */

logger.js

@@ -18,28 +18,22 @@ function getTimeString() {
 
 var Logger = function(filename) {
     this.filename = filename;
-    this.buffer = [];
-
-    setInterval(function() {
-        this.flush();
-    }.bind(this), 15000);
+    this.writer = fs.createWriteStream(filename, {
+        flags: "a",
+        encoding: "utf-8"
+    });
 }
 
-Logger.prototype.log = function(what) {
-    this.buffer.push("[" + getTimeString() + "] " + what);
+Logger.prototype.log = function () {
+    var msg = "";
+    for(var i in arguments)
+        msg += arguments[i];
+    var str = "[" + getTimeString() + "] " + msg + "\n";
+    this.writer.write(str);
 }
 
-Logger.prototype.flush = function() {
-    if(this.buffer.length == 0)
-        return;
-    var text = this.buffer.join("\n") + "\n";
-    this.buffer = [];
-    fs.appendFile(this.filename, text, function(err) {
-        if(err) {
-            errlog.log("Append to " + this.filename + " failed: ");
-            errlog.log(err);
-        }
-    }.bind(this));
+Logger.prototype.close = function () {
+    this.writer.end();
 }
 
 var errlog = new Logger("error.log");