first commit

web/state/logger.js

@@ -0,0 +1,38 @@
+const fs = require('fs');
+const _ = require('lodash');
+
+const BASEPATH = __dirname + '/../../logs/';
+
+const Logger = function(id) {
+
+  this.fileName = `${id}.log`;
+
+  this.writing = false;
+  this.queue = [];
+
+  _.bindAll(this);
+}
+
+Logger.prototype.write = function(line) {
+  if(!this.writing) {
+    this.writing = true;
+    fs.appendFile(
+      BASEPATH + this.fileName,
+      line + '\n',
+      this.handleWriteCallback
+    );
+  } else
+    this.queue.push(line);
+}
+
+Logger.prototype.handleWriteCallback = function(err) {
+  if(err)
+    console.error(`ERROR WRITING LOG FILE ${this.fileName}:`, err);
+
+  this.writing = false;
+
+  if(_.size(this.queue))
+    this.write(this.queue.shift())
+}
+
+module.exports = Logger;