chushihua

node_modules/sockjs-client/lib/info-ajax.js

@@ -0,0 +1,49 @@
+'use strict';
+
+var EventEmitter = require('events').EventEmitter
+  , inherits = require('inherits')
+  , JSON3 = require('json3')
+  , objectUtils = require('./utils/object')
+  ;
+
+var debug = function() {};
+if (process.env.NODE_ENV !== 'production') {
+  debug = require('debug')('sockjs-client:info-ajax');
+}
+
+function InfoAjax(url, AjaxObject) {
+  EventEmitter.call(this);
+
+  var self = this;
+  var t0 = +new Date();
+  this.xo = new AjaxObject('GET', url);
+
+  this.xo.once('finish', function(status, text) {
+    var info, rtt;
+    if (status === 200) {
+      rtt = (+new Date()) - t0;
+      if (text) {
+        try {
+          info = JSON3.parse(text);
+        } catch (e) {
+          debug('bad json', text);
+        }
+      }
+
+      if (!objectUtils.isObject(info)) {
+        info = {};
+      }
+    }
+    self.emit('finish', info, rtt);
+    self.removeAllListeners();
+  });
+}
+
+inherits(InfoAjax, EventEmitter);
+
+InfoAjax.prototype.close = function() {
+  this.removeAllListeners();
+  this.xo.close();
+};
+
+module.exports = InfoAjax;