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suprememoocow/intercept.js

Created May 29, 2012 09:53
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  1. suprememoocow created this gist May 29, 2012.
    62 changes: 62 additions & 0 deletions intercept.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,62 @@

    (function(XHR) {
    "use strict";

    var stats = [];
    var timeoutId = null;

    var open = XHR.prototype.open;
    var send = XHR.prototype.send;

    XHR.prototype.open = function(method, url, async, user, pass) {
    this._url = url;
    open.call(this, method, url, async, user, pass);
    };

    XHR.prototype.send = function(data) {
    var self = this;
    var start;
    var oldOnReadyStateChange;
    var url = this._url;

    function onReadyStateChange() {
    if(self.readyState == 4 /* complete */) {
    var time = new Date() - start;
    stats.push({
    url: url,
    duration: time
    });

    if(!timeoutId) {
    timeoutId = window.setTimeout(function() {
    var xhr = new XHR();
    xhr.noIntercept = true;
    xhr.open("POST", "/clientAjaxStats", true);
    xhr.setRequestHeader("Content-type","application/json");
    xhr.send(JSON.stringify({ stats: stats } ));

    timeoutId = null;
    stats = [];
    }, 2000);
    }
    }

    if(oldOnReadyStateChange) {
    oldOnReadyStateChange();
    }
    }

    if(!this.noIntercept) {
    start = new Date();

    if(this.addEventListener) {
    this.addEventListener("readystatechange", onReadyStateChange, false);
    } else {
    oldOnReadyStateChange = this.onreadystatechange;
    this.onreadystatechange = onReadyStateChange;
    }
    }

    send.call(this, data);
    }
    })(XMLHttpRequest);