browser-based enforcement of interface contracts in web applications with beepbeep (talk @ cav 2009)
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Sylvain Hallé
Sylvain Hallé, Roger Villemaire
Browser-based Enforcement ofInterface Contracts in Web Applications
with BeepBeep
University of CaliforniaSanta Barbara, USA
Université du Québec à MontréalMontréal, CANADA
Sylvain Hallé
Some web services
E-Commerce ServiceCompute Cloud
PayPal API: billing, express checkout
Shopping: like AmazonGoogle Search, Google Maps, GMail, ...
Sylvain Hallé
MyApplication.com
Using web applications
Sylvain Hallé
MyApplication.com
Using web applications
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MyApplication.comi ?
Using web applications
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MyApplication.com
1.
2.
...
i ?
Using web applications
Sylvain Hallé
<ListItems>
</ListItems> birds<title> </title>
<Items>
</Items>
1
abc
<Item> </ID> <Title> </Title> </Item> ...
<ID>
MyApplication.com
XML request
XMLresponse
Using web applications
Sylvain Hallé
Using web applications
MyApplication.com
2
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Using web applications
MyApplication.com
c
2
Sylvain Hallé
<cart>
</cart>
<id> </id><items>
</items>
c
2 <item> </item>
<cartCreate>
</cartCreate> 2<item> </item>
XML request
MyApplication.com
XMLresponse
Using web applications
Sylvain Hallé
Using web applications
MyApplication.com
2
c
Sylvain Hallé
Using web applications
MyApplication.com
2
c
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Constraints on the message trace
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i ?
Constraints on the message trace
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i ?
1.
2.
...
Constraints on the message trace
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i ?
1.
2.
...
2
c
Constraints on the message trace
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i ?
1.
2.
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2
c
2
c
Constraints on the message trace
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i ?
1.
2.
...
2
c
2
c
You cannot add the same item twiceto the shopping cart
Constraints on the message trace
Sylvain Hallé
i ?
1.
2.
...
2
c
2
c
You cannot add the same item twiceto the shopping cart
Constraints on the message trace
???
Sylvain Hallé
Constraints on the message trace
???
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Constraints on the message trace
???
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2 2
c
You cannot add the same item twiceto the shopping cart
! Atoms are properties over messages...
Constraints on the message trace
Sylvain Hallé
2 2
cG F( (Þ Ø
You cannot add the same item twiceto the shopping cart
! Atoms are properties over messages...! + LTL operators...
Constraints on the message trace
Sylvain Hallé
i i
cG( (Þ"i FØ
You cannot add the same item twiceto the shopping cart
! Atoms are properties over messages...! + LTL operators...! + quantification on elements
Constraints on the message trace
Sylvain Hallé
i i
cG( (Þ"i FØ
You cannot add the same item twiceto the shopping cart
! Atoms are properties over messages...! + LTL operators...! + quantification on elements } LTL-FO+
Constraints on the message trace
Sylvain Hallé
Enter BeepBeep
MyApplication.com
Sylvain Hallé
MyApplication.com
Enter BeepBeep
Sylvain Hallé
MyApplication.com
ii ii
ccGG(( ((ÞÞ""ii FFØØ
Enter BeepBeep
Sylvain Hallé
Enter BeepBeep
MyApplication.com
2
Sylvain Hallé
MyApplication.com
Enter BeepBeep
Sylvain Hallé
Enter BeepBeep
MyApplication.com
2
Sylvain Hallé
Enter BeepBeep
MyApplication.com
2
Sylvain Hallé
MyApplication.com
Enter BeepBeep
Sylvain Hallé
MyApplication.com
Enter BeepBeep
Sylvain Hallé
Adding BeepBeep to a real application
Sylvain Hallé
Adding BeepBeep to a real application
Copy BeepBeep to application folderhttp://beepbeep.sourceforge.net
�
Sylvain Hallé
Adding BeepBeep to a real application
Copy BeepBeep to application folderhttp://beepbeep.sourceforge.net
Include BeepBeep
�
�
Sylvain Hallé
Adding BeepBeep to a real application
myapplication.html
<html><head><title></title><script type=" " href=" "/>
</head><body>
</body></html>
My Application
...
text/javascriptmyapplication.js
Copy BeepBeep to application folderhttp://beepbeep.sourceforge.net
Include BeepBeep
�
�
Sylvain Hallé
Adding BeepBeep to a real application
myapplication.html
<html><head><title></title><script type=" " href=" "/>
</head><body>
</body></html>
My Application
...
text/javascriptmyapplication.js
<script type="text/javascript" href="beepbeep.js"/>
Copy BeepBeep to application folderhttp://beepbeep.sourceforge.net
Include BeepBeep
�
�
Sylvain Hallé
Adding BeepBeep to a real application
myapplication.html myapplication.js
<html><head><title></title><script type=" " href=" "/>
</head><body>
</body></html>
My Application
...
text/javascriptmyapplication.js
<script type="text/javascript" href="beepbeep.js"/>
// Initializations
= ();
(){
( );}
...
req XMLHttpRequest
...
abc
... req. some_message
new
function
send
Copy BeepBeep to application folderhttp://beepbeep.sourceforge.net
Include BeepBeep
�
�
Sylvain Hallé
Adding BeepBeep to a real application
myapplication.html myapplication.js
<html><head><title></title><script type=" " href=" "/>
</head><body>
</body></html>
My Application
...
text/javascriptmyapplication.js
<script type="text/javascript" href="beepbeep.js"/>
// Initializations
= ();
(){
( );}
...
req
...
abc
... req. some_message
new
function
send
XMLHttpRequestBB
Copy BeepBeep to application folderhttp://beepbeep.sourceforge.net
Include BeepBeep
�
�
Sylvain Hallé
Obtain (or create) a with LTL-FO+ formulaecontract file�
Adding BeepBeep to a real application
# ---------------------------------------------------------------# BeepBeep contract file for the Amazon ECS# ---------------------------------------------------------------
% To create a cart, you must put at least one item
% You can only create a cart once
% No CartAdd can occur before a CartCreate
% You cannot add the same item twice to the shopping cart
; G ([x1 /CartCreate/Operation] (((x1) = ({CartCreate})) -> (<x2 /CartCreate/Items/Item/ASIN> ({TRUE}))))
; G ([x1 /CartCreate/Operation] (((x1) = ({CartCreate})) -> (X (G (!(<x2 /CartCreate/Operation> ((x2) = ({CartCreate}))))))))
; (!(<x1 /CartAdd/Operation> ((x1) = ({CartAdd})))) U (<x2 /CartCreate/Operation> ((x2) = ({CartCreate})))
; G ([i /CartCreate/Items/Item/ASIN] (X (G ([j /CartAdd/Items/Item/ASIN] (!((i) = (j)))))))
Sylvain Hallé
Quick demo
Sylvain Hallé
Sample property: "each car entering in a parking lot must exit before entering again"
Tim
e pe
r m
essa
ge (
ms)
Trace length
Experimental results
Hallé & Villemaire, EDOC 2008
< 5 ms/msg.
Sylvain Hallé
Simultaneous monitoring of 11 properties (Amazon example)
Experimental results
-20
0 20 40 60 80 100 120 140 160 180 200
-10
0
10
20
Moyenne
Tim
e d
iffe
ren
ce (
%)
< 5%
Trace length
Sylvain Hallé
Simultaneous monitoring of 11 properties (Amazon example)
Experimental results
Tim
e pe
r m
essa
ge (
ms)
Trace length
Data domain
00 20 40 60 80 100 120 140 160
2
4
14
6
8
10
12
200
25
Sylvain Hallé
Take-home points
Sylvain Hallé
1. Constraints involving operators and on message contents arise naturally in web applications
temporal quantificationreal
Take-home points
Sylvain Hallé
1. Constraints involving operators and on message contents arise naturally in web applications
2. An extension of LTL can formalize them:
temporal quantificationreal
LTL-FO+
Take-home points
Sylvain Hallé
1. Constraints involving operators and on message contents arise naturally in web applications
2. An extension of LTL can formalize them:
3. of these constraints can be doneefficiently, even with quantification
temporal quantificationreal
LTL-FO+
Runtime monitoring
Take-home points
Sylvain Hallé
1. Constraints involving operators and on message contents arise naturally in web applications
2. An extension of LTL can formalize them:
3. of these constraints can be doneefficiently, even with quantification
4. BeepBeep is a tool that allows it with on real applications
temporal quantificationreal
LTL-FO+
Runtime monitoring
minimal modifications
http://beepbeep.sourceforge.net/
Take-home points
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