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/* See license.txt for terms of usage */
// ********************************************************************************************* //
// Constants
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;
const Cu = Components.utils;
var EXPORTED_SYMBOLS = ["httpRequestObserver"];
var observerService = Cc["@mozilla.org/observer-service;1"].getService(Ci.nsIObserverService);
var categoryManager = Cc["@mozilla.org/categorymanager;1"].getService(Ci.nsICategoryManager);
Cu["import"]("resource://firebug/fbtrace.js");
// ********************************************************************************************* //
// HTTP Request Observer implementation
/**
* @service This service is intended as the only HTTP observer registered by Firebug.
* All FB extensions and Firebug itself should register a listener within this
* service in order to listen for http-on-modify-request, http-on-examine-response and
* http-on-examine-cached-response events.
*
* See also: <a href="http://developer.mozilla.org/en/Setting_HTTP_request_headers">
* Setting_HTTP_request_headers</a>
*/
var httpRequestObserver =
/** lends HttpRequestObserver */
{
preInitialize: function()
{
this.observers = [];
this.observing = 0;
this.initialize();
},
initialize: function()
{
observerService.addObserver(this, "quit-application", false);
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.initialize OK");
},
shutdown: function()
{
observerService.removeObserver(this, "quit-application");
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.shutdown OK");
},
registerObservers: function()
{
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.registerObservers; wasObserving: " +
this.observing + " with observers "+this.observers.length, this.observers);
if (!this.observing)
{
observerService.addObserver(this, "http-on-opening-request", false);
observerService.addObserver(this, "http-on-modify-request", false);
observerService.addObserver(this, "http-on-examine-response", false);
observerService.addObserver(this, "http-on-examine-cached-response", false);
}
this.observing = true;
},
unregisterObservers: function()
{
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.unregisterObservers; wasObserving: " +
this.observing + " with observers "+this.observers.length, this.observers);
if (this.observing)
{
observerService.removeObserver(this, "http-on-opening-request");
observerService.removeObserver(this, "http-on-modify-request");
observerService.removeObserver(this, "http-on-examine-response");
observerService.removeObserver(this, "http-on-examine-cached-response");
}
this.observing = false;
},
/* nsIObserve */
observe: function(subject, topic, data)
{
if (topic == "quit-application")
{
this.shutdown();
return;
}
try
{
if (!(subject instanceof Ci.nsIHttpChannel))
return;
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.observe " + (topic ? topic.toUpperCase() : topic) +
", " + safeGetName(subject));
// Notify all registered observers.
if (topic == "http-on-opening-request" ||
topic == "http-on-modify-request" ||
topic == "http-on-examine-response" ||
topic == "http-on-examine-cached-response")
{
this.notifyObservers(subject, topic, data);
}
}
catch (err)
{
if (FBTrace.DBG_ERRORS)
FBTrace.sysout("httpObserver.observe EXCEPTION", err);
}
},
/* nsIObserverService */
addObserver: function(observer, topic, weak)
{
if (!topic)
topic = "firebug-http-event";
if (topic != "firebug-http-event")
throw Cr.NS_ERROR_INVALID_ARG;
this.observers.push(observer);
if (this.observers.length > 0)
this.registerObservers();
},
removeObserver: function(observer, topic)
{
if (!topic)
topic = "firebug-http-event";
if (topic != "firebug-http-event")
throw Cr.NS_ERROR_INVALID_ARG;
for (var i=0; i<this.observers.length; i++)
{
if (this.observers[i] == observer)
{
this.observers.splice(i, 1);
if (this.observers.length == 0)
this.unregisterObservers();
return;
}
}
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.removeObserver FAILED (no such observer)");
},
notifyObservers: function(subject, topic, data)
{
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.notifyObservers (" + this.observers.length + ") " + topic);
for (var i=0; i<this.observers.length; i++)
{
var observer = this.observers[i];
try
{
if (observer.observe)
observer.observe(subject, topic, data);
}
catch (err)
{
if (FBTrace.DBG_HTTPOBSERVER)
FBTrace.sysout("httpObserver.notifyObservers; EXCEPTION " + err, err);
}
}
}
};
// ********************************************************************************************* //
// Request helpers
function safeGetName(request)
{
try
{
return request.name;
}
catch (exc)
{
}
return null;
}
// ********************************************************************************************* //
// Debugging Helpers
function dumpStack(message)
{
dump(message + "\n");
for (var frame = Components.stack, i = 0; frame; frame = frame.caller, i++)
{
if (i < 1)
continue;
var fileName = unescape(frame.filename ? frame.filename : "");
var lineNumber = frame.lineNumber ? frame.lineNumber : "";
dump(fileName + ":" + lineNumber + "\n");
}
}
// ********************************************************************************************* //
// Initialization
httpRequestObserver.preInitialize();
// ********************************************************************************************* //
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