NOTICE GeniusWebPython is due for release on august 2, 2021

GeniusWebPython

GeniusWeb is an open architecture for negotiation via the internet. The core of the architecture is a JSON based communication protocol that standardizes the communication messages comprising a negotiation.

This project contains a c-python-3-based implementation of GeniusWeb core objects. It allows easy (de)serialization of many data structures needed for negotiation in GeniusWeb. Some data structures have not yet been implemented in GeniusWebPython, this will be done as needed. Please contact us if you need some missing classes.

A specification and full reference implementation of the GeniusWeb core is available ​here

Overview of the available core objects

Most classes in the python core are explained in the java reference implementation:

class	wiki reference
issuevalue	see ​wiki issuevalue
inform	see ​wiki inform
actions	see ​wiki actions
deadline	see ​wiki deadline
progress	see ​wiki progress
connection	see ​wiki connection

Example Parties

Example parties can be found here. Many of these are also included with the basic ​parties server to provide basic functionality.

Below is a table showing the currently available example parties and their properties. Notice, "Supported profile types" gives the class names of all supported types, so for instance "PartialOrdering" means all subclasses of PartialOrdering which also includes all UtilitySpaces.

Party	Protocol	Supported profile types	Parameters (default value)
RandomParty	SAOP, Learn	LinearAdditive	minPower (2), maxPower (infinity). Used to control voting behaviour
stupidparty	SAOP	LinearAdditive	-

Writing a party

Example parties can be found here. You can easily clone a party with SVN using svn co https://tracinsy.ewi.tudelft.nl/pub/svn/GeniusWebPython/exampleparties/randomparty/ (this clones randomparty, use a different name to fetch another example).

After cloning, create your venv and install the requirements, eg

python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt

You can now run the junit tests.

You may have to take different or additional steps if you use an IDE like eclipse with pydev, or pycharm.

A party is compiled with python. Compile with python3 setup.py sdist. This gives you a you get a dist/yourparty-X.Y.Z.tar.gz that can be copied into the pypartiesserver for deployment.

The basic structure of a party that supports the SAOP behaviour looks like this

class RandomParty (DefaultParty):
    """
    Offers random bids until a bid with sufficient utility is offered
    """
    def __init__(self):
        super().__init__()
        self.getReporter().log(logging.INFO,"party is initialized")
        self._profile = None
        self._lastReceivedBid:Bid = None

    def notifyChange(self, info: Inform):
        #self.getReporter().log(logging.INFO,"received info:"+str(info))
        if isinstance(info,Settings) :
            settings:Settings=cast(Settings,info)    
            self._me = settings.getID()
            self._protocol:str = str(settings.getProtocol().getURI())
            self._progress = settings.getProgress()
            if "Learn" ==  self._protocol:
                self.getConnection().send(LearningDone(self._me))
            else:
                self._profile = ProfileConnectionFactory.create(info.getProfile().getURI(), self.getReporter())
        elif isinstance(info, ActionDone):
            action:Action=cast( ActionDone,info).getAction()
            if isinstance(action, Offer):
                self._lastReceivedBid = cast(Offer, action).getBid()
        elif isinstance(info, YourTurn):
            self._myTurn()
            if isinstance(self._progress, ProgressRounds) :
                self._progress = self._progress.advance()
        elif isinstance(info, Finished):
            self.terminate()
        else:
            self.getReporter().log(logging.WARNING, "Ignoring unknown info "+str(info))


    def getCapabilities(self) -> Capabilities:
        return Capabilities( set([ "SAOP", "Learn"]), set(['geniusweb.profile.utilityspace.LinearAdditive']))

    def getDescription(self) -> str:
        return "Offers random bids until a bid with sufficient utility is offered"

    def _myTurn(self):
        if self._lastReceivedBid != None and \
            self._profile.getProfile().getUtility(self._lastReceivedBid) > 0.6:
            action = Accept(self._me, self._lastReceivedBid)
        else:
            for _attempt in range(20):
                bid = self._getRandomBid(self._profile.getProfile().getDomain())
                if self._isGood(bid):
                    break
            action = Offer(self._me, bid);
        self.getConnection().send(action)

    def _isGood(self, bid:Bid)->bool:
        profile = self._profile.getProfile()
        return profile.getUtility(bid) > 0.6

...

The party must follow the behaviours that it promises. The example above folows the SAOP behaviour.

Notice, above is slightly simplified code, for fully working code check the source code.

Throwing exceptions

A special warning is in place regarding throwing exceptions from your implementation, particularly from notifyChange. In line with the general Listener interface, exceptions are only logged and your party usually is immediately disconnected if it throws any exception. Make sure that you free up any used resources to avoid memory leaks if you really need to throw an exception.

Preparing the jar file

In order to put your party on the ​partiesserver for running, you need a jar file of your party.

Normally the party includes all dependencies. The jar files are loaded with an isolated jar class loader that should avoid collisions with possibly identically named but possibly different packages in other jar files.

Party jar files must have a Main-Class set in the MANIFEST.MF file. This main-class must implement Party and have a no-arg constructor.

The example randomparty does this from the maven build script.

We recommend to do initialization of the party only in the init() and not in the constructor or static code. This because instances of your class can be made both for extracting general info as getDescription(), or to really run your class.

GeniusWeb sources

Downloading source code

You can browse the GeniusWeb core sources directly using the browse button at the right top of this page.

You can download the source code of this component using

svn co https://tracinsy.ewi.tudelft.nl/pub/svn/GeniusWebPython

Normal developers that write new parties do not need to install the GeniusWeb source code. Even if you want to debug/trace into the GeniusWeb code -- for instance for debugging or understanding the inner workings of geniusWeb--, IDEs like Eclipse automatically allow this as the pip-installed libraries contain sources.