Package: wampy
wampy[whomp-ee]For a background as to what WAMP is, please seehere.This is a Python implementation ofWAMPusingGevent, but you can also configurewampyto useeventlet, if that is how your
application does async.Wampyis is a light-weight alternative toautobahn.Withwampy, you can quickly and easily create your ownWAMPclients, whether this is in a web app, a microservice, a script or just
in a Python shell. You can integratewampyinto your existing
applications without having to re-write or re-design anything.wampytries to provide an intuitive API for yourWAMPmessaging.SeeReadTheDocsfor more
detailed documentation, but the README here is detailed enough to get
going.wampy featuresRemote Procedure Calls over websocketsPublish and Subscribe over websocketsOpen Source and OpenThoughts- seeinternalsand then the entire WIKIUsewampyas a microservice/app, or in your Flask or nameko
apps, or in scripts.... or just in a Python shell!Client Authentication (Ticket and WCA)Transport Layer SecurityCLI for easy and rapid developmentPytest fixtures to use when testing your projects, including a
Crossbar.io fixture that tears down between each testnamekointegration withnamekowwampFlaskintegration withflaskwwampCompatible with gevent, eventlet and asyncioAlpha features (see below)QuickStart - Connect and Go!If you've already got access to a runningRouterwhich has otherPeersconnected, then stay here. If not, jump to the next section.
If you're still here...pip install wampy...and then open a Python shell.The example here assumes aPeerconnected to aRouteronlocalhost, port8080, that has registered a remote procedure calledget_foobar, and you want tocallthat procedure.from wampy.peers import Client

with Client() as client:
    response = client.rpc.get_foobar()

# do something with the response hereThe same example here, but theRouteris on aremotehost.from wampy.peers import Client

with Client(url="ws://example.com:8080") as client:
    response = client.rpc.get_foobar()

# do something with the response hereThe WAMP Session is "context managed", meaning it begins as you enter,
and ends as you exit the scope of the client instance.SeeReadTheDocsfor much more
detail on this.Running and Calling a wampy ApplicationBefore any messaging can happen you need aRouter. Messages are then
routed betweenClientsover an administrative domain on theRoutercalled aRealm.For the quickest of starts I suggest that you useCrossbar.ioand
start it up on the default host and port, and with the defaultrealmandroles. See theCrossbar.io
docsfor the instructions on this
or alternatively run withwampy'stesting setup.Note, if you already have Crossbar installed and running you donotneed these steps, because the dev requirements also include Crossbar.$ make dev-install

$ crossbar start --config ./wampy/testing/configs/crossbar.jsonwampy RPCNow open your preferred text editor and we'll write a few lines of
Python constructing a simpleWAMPservice that takes a decimal
number and returns the binary representation of it - wowzers!from wampy.peers.clients import Client
from wampy.roles import callee

class BinaryNumberService(Client):

    @callee
    def get_binary_number(self, number):
        return bin(number)Save this module somewhere on your Python path and we'll use awampycommand line interface tool to start the service.$ wampy run path.to.your.module.including.module_name:BinaryNumberServiceFor example, running one of thewampyexample applications against
the Router suggested previously:$ wampy run docs.examples.services:DateService --config ./wampy/testing/configs/crossbar.jsonActually - no need to panic! TheBinaryNumberServiceexample already
exists in thewampyexamples so put that text editor away if you
like. Just execute from the command line:$ wampy run docs.examples.services:BinaryNumberService --config ./wampy/testing/configs/crossbar.jsonNow, open a Python console in a new terminal, allowing theBinaryNumberServiceto run uninterupted in your original terminal (but
once you're done with itCtrl-Cis required).In [1]: from wampy.peers.clients import Client

In [2]: with Client(url="ws://localhost:8080") as client:
            result = client.rpc.get_binary_number(number=100)

In [3]: result
Out[3]: u'0b1100100'wampy RPC for Crossbar.ioThe RPC pattern above was inspired by thenamekoproject, but this pattern may not
feel intuitive for those familiar withCrossbar.io, the primary
Router used bywampy.For this reason there also exists theCallProxyobject which
implements thecallAPI by more loosely wrappingwampy'sCallMessage. In this pattern, applications and their endpoints are
identified by dot delimented strings rather than a single API name, e.g."com.example.endpoint"Just like therpcAPI, thecallAPI is directly available on everywampyclient. Lets look at the two examples side by side.>>> client.rpc.get_foo_bar(eggs, foo=bar, spam=ham)
>>> client.call("get_foo_bar", eggs, foo=bar, spam=ham)Noted these are very similar and achieve the same, but the intention
here is for thecallAPI to behave more like a classicCrossbar.ioapplication and therpcto be used innamekowwamp.ThecallAPI however does allow calls of the form...>>> client.call("com.myapp.foo.bar", eggs, foo=bar, spam=ham)...which you will not be able to do with therpcAPI.Publishing and Subscribing is equally as simpleTo demonstrate, first of all you need aSubscriber. You can either
create one yourself in a Python module (as a subclass of awampyClient) or use the exampleClientalready for you indocs.examples.services.Here we use the said example service, but all aSubscriberis is awampyClientwith a method decorated bysubscribe. Take a look
and see for yourself in theexamples.Let's start up that example service.$ wampy run docs.examples.services:SubscribingService --config ./wampy/testing/configs/crossbar.jsonNow we have a service running that subscribes to the topic "foo".In another terminal, with awampyvirtualenv, you can create aPublisher- which is no different to any otherwampyClient.In [1]: from wampy.peers import Client

In [2]: with Client() as client:
            result = client.publish(topic="foo", message="spam")Hopefully you'll see any message you send printed to the screen where
the example service is running. You'll also see the meta data thatwampychooses to send.Please note.wampybelieves in explicitkwargsand not bareargs, so you can only publish keyword arguments. Bare arguments don't
tell readers enough about the call, so even thoughWAMPsupports
them,wampydoes not.It doesn't matter what thekwargsare they will be published, but you
might find a call like this is not supported by subscribers of otherWAMPimplementations (sorry) e.g.In [1]: from wampy.peers import Client

In [2]: with Client() as client:
            client.publish(
                topic="foo",
                ham="spam",
                birds={'foo_bird': 1, 'bar_bird': 2},
                message="hello world",
            )Noticetopicisalwaysfirst, followed bykwargs. Happy to explore
how implementations likeautobahncan be
supported here.SeeReadTheDocsfor more
detailed documentation.Have Fun With WampyYou can simply import a wampy client into a Python shell and start
creating WAMP apps. Open a few shells and start clients running! Or
start an example app and open a shell and start calling it. Don't forget
to start Crossbar first though!$ make install

$ crossbar start --config ./wampy/testing/configs/crossbar.jsonExtensionsWampy is a "simple" WAMP client and so it can easily be integrated with
other frameworks. The current extensions are:Flask-WAMPnameko-wampExtensions for other Python Frameworks are encouraged!Async NetworkingThe default backend for async networking isgevent, but you can
switch this toeventletif that is what your applications already
use.$ export WAMPY_ASYNC_NAME=eventletSwapping back is easy.$ export WAMPY_ASYNC_NAME=geventGevent is officially supported but eventlet no longer is, sorry. There
were issues with Eventlet and Python 3.7 that I cannot currently work
around.Async.io would require a complete re-write, and if you're already using
the standard library and want to usewampythat isnota problem -
just roll with the default gevent - as the two event loops can run side
by side.Why does wampy support both eventlet and gevent? Because wampy is not a
framework like Flask or nameko, and wampy tries to make as few
assumptions about the process it is running in as possible. Wampy is
intended to be integrated into existing Python apps as an easy way to
send and receive WAMP messages, and if your app is already committed to
a paritcular async architecture, then wampy may not be usable unless he
can switch between them freely. And do remember: both options are
compatible with the core asyncio library, so don't be put off if your
app uses this.Alpha FeaturesWebSocket Client -> Server PingsDisabled by default, but by setting the environment variableDEFAULT_HEARTBEAT_SECONDSyou can tell wampy to start Pinging the
Router/Broker, i.e. Crossbar.$ export DEFAULT_HEARTBEAT_SECONDS=5There is alsoHEARTBEAT_TIMEOUT_SECONDS(defaults to 2 seconds)
which on missed will incrmeent a missed Pong counter. That's it for now;
WIP.WAMP Call TimeOutsWAMP advacned protocol describes an RPC timeout whichwampyimplements but Crossbar as yet does not. Seehttps://github.com/crossbario/crossbar/issues/299. wampy does pass
your preferred value to the Router/Broker in the Call Message, but the
actual timeout is implemented by wampy, simply cutting the request off
at the head. Sadly this does mean the server still may return a value
for you and your app will have to handle this. We send the Cancel
Message too, but there are issues here as well: Work In Progress.Running the tests$ pip install --editable .[dev]
$ py.test ./test -vBuild the docs$ pip install -r rtd_requirements.txt
$ sphinx-build -E -b html ./docs/ ./docs/_build/If you like this project, then Thank You, and you're welcome to get
involved.ContributingFirstly. thank you everyone who does. Andeveryoneis welcome to. And
thanks for reading theCONTRIBUTINGguidelines. And for adding yourselves to theCONTRIBUTORSlist on your PR - you should! Many thanks. It's also great to hear how
everyone uses wampy, so please do share how with me on your PR in
comments.Then, please read about theinternals.Finally.... get coding!!Thanks!TroubleShootingCrossbar.io is used by the test runner and has many dependencies.Mac OSsnappy/snappymodule.cc:31:10: fatal error: 'snappy-c.h' file not found   #include <snappy-c.h>Fix by brew install snappy