commandodev/stargate_process_example.py

## stargate_process_example.py
import eventlet
from eventlet import wsgi
from paste.httpserver import serve
from pyramid.config import Configurator
from pyramid.response import Response
from pyramid.view import view_config
from stargate import WebSocketAwareResource, WebSocketView, is_websocket
import simplejson as json

host = "127.0.0.1"
port = 9999

home_html = """\
<html>
    <head>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
        <script>
            $(function() {
    ws = new WebSocket("ws://%(host)s:%(port)s/jobs/1/");
    ws.onmessage = function(msg) {
        $("body").append("<p>" + msg.data + "</p>");
    };
    STARTED = false;
    $("#start-stop").click(function(evt) {
        $.post("/jobs/1/", {state: STARTED ? "stop" : "start"}, function(result) {
            STARTED = !STARTED;
            $('#start-stop span').text(STARTED ? "on" : "off");

        });
    });
});
        </script>
    </head>
    <body>
        <h1>Hi</h1>
        <button id="start-stop">Job 1 <span>off</span></button>
    </body>
</html>
""" % dict(host=host, port=port)

class JobRoot(object):
    """A container for jobs

    Gets or creates Job objects for certain ids
    """

    def __init__(self):
        self._jobs = {}

    def __getitem__(self, item):
        try:
            return self._jobs[item]
        except KeyError:
            return self.create_job(item)

    def create_job(self, id):
        job = Job(id, self)
        self._jobs[id] = job
        return job


class Job(WebSocketAwareResource):
    """This is a permanent object.

    It's responsible for maintaning a list of connected clients (websockets)
    and updating them when its state changes
    """

    def __init__(self, id, parent):
        self.__name__ = id
        self.__parent__ = parent
        self.state = "OFF"

    def control(self, state):
        """This function updates the state

        Its called by the control function (in response to a post)
        It triggers the sending of self.state to all connected clients. If you
        connect multiple browsers (or tabs) they will all be updated
        """
        self.state = state
        self.send(state)

class JobView(WebSocketView):
    """The view connects pyramid with the resource

    In this simple example it simply adds the websocket to the Job's listeners.
    It then goes to sleep *blocking the thread it's in* this is where eventlet
    comes in. In real live in the while True bit you'd do things like listening
    for updates and handline messages coming in on the websocket
    """

    def handler(self, websocket):
        job = self.request.context
        job.add_listener(websocket)
        while True:
            eventlet.sleep(60)

def control(job, request):
    """Post to this view to set the state

    this will trigger Job to report the state to connected clients
    """
    state = request.POST.get("state")
    if state:
        job.control(state)
    return dict(id=job.__name__, state=job.state)

class Root(dict):
    """The root of url traversal

            /jobs/{id}
    -> Root['jobs'][id]
    -> Root/JobRoot/Job

    See https://pylonsproject.org/projects/pyramid/dev/narr/traversal.html
    """

    def __init__(self):
        super(Root, self).__init__(jobs=JobRoot())

def home(request):
    """Serves up home_html, setting up a simple js demo"""
    return Response(home_html)

root = Root()

def root_factory(request):
    return root

if __name__ == '__main__':
    config = Configurator(root_factory=root_factory)
    config.add_view(home, context=Root)
    config.add_view(JobView, context=Job, custom_predicates=[is_websocket])
    config.add_view(control, context=Job, renderer="json", xhr=True)
    #config.add_static_view(name='static', path='/Users/tim2/nyb/python')
    app = config.make_wsgi_app()
    listener = eventlet.listen((host, port))
    wsgi.server(listener, app)
	import eventlet
	from eventlet import wsgi
	from paste.httpserver import serve
	from pyramid.config import Configurator
	from pyramid.response import Response
	from pyramid.view import view_config
	from stargate import WebSocketAwareResource, WebSocketView, is_websocket
	import simplejson as json

	host = "127.0.0.1"
	port = 9999

	home_html = """\
	<html>
	<head>
	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
	<script>
	$(function() {
	ws = new WebSocket("ws://%(host)s:%(port)s/jobs/1/");
	ws.onmessage = function(msg) {
	$("body").append("<p>" + msg.data + "</p>");
	};
	STARTED = false;
	$("#start-stop").click(function(evt) {
	$.post("/jobs/1/", {state: STARTED ? "stop" : "start"}, function(result) {
	STARTED = !STARTED;
	$('#start-stop span').text(STARTED ? "on" : "off");

	});
	});
	});
	</script>
	</head>
	<body>
	<h1>Hi</h1>
	<button id="start-stop">Job 1 <span>off</span></button>
	</body>
	</html>
	""" % dict(host=host, port=port)

	class JobRoot(object):
	"""A container for jobs

	Gets or creates Job objects for certain ids
	"""

	def __init__(self):
	self._jobs = {}

	def __getitem__(self, item):
	try:
	return self._jobs[item]
	except KeyError:
	return self.create_job(item)

	def create_job(self, id):
	job = Job(id, self)
	self._jobs[id] = job
	return job


	class Job(WebSocketAwareResource):
	"""This is a permanent object.

	It's responsible for maintaning a list of connected clients (websockets)
	and updating them when its state changes
	"""

	def __init__(self, id, parent):
	self.__name__ = id
	self.__parent__ = parent
	self.state = "OFF"

	def control(self, state):
	"""This function updates the state

	Its called by the control function (in response to a post)
	It triggers the sending of self.state to all connected clients. If you
	connect multiple browsers (or tabs) they will all be updated
	"""
	self.state = state
	self.send(state)

	class JobView(WebSocketView):
	"""The view connects pyramid with the resource

	In this simple example it simply adds the websocket to the Job's listeners.
	It then goes to sleep blocking the thread it's in this is where eventlet
	comes in. In real live in the while True bit you'd do things like listening
	for updates and handline messages coming in on the websocket
	"""

	def handler(self, websocket):
	job = self.request.context
	job.add_listener(websocket)
	while True:
	eventlet.sleep(60)

	def control(job, request):
	"""Post to this view to set the state

	this will trigger Job to report the state to connected clients
	"""
	state = request.POST.get("state")
	if state:
	job.control(state)
	return dict(id=job.__name__, state=job.state)

	class Root(dict):
	"""The root of url traversal

	/jobs/{id}
	-> Root['jobs'][id]
	-> Root/JobRoot/Job

	See https://pylonsproject.org/projects/pyramid/dev/narr/traversal.html
	"""

	def __init__(self):
	super(Root, self).__init__(jobs=JobRoot())

	def home(request):
	"""Serves up home_html, setting up a simple js demo"""
	return Response(home_html)

	root = Root()

	def root_factory(request):
	return root

	if __name__ == '__main__':
	config = Configurator(root_factory=root_factory)
	config.add_view(home, context=Root)
	config.add_view(JobView, context=Job, custom_predicates=[is_websocket])
	config.add_view(control, context=Job, renderer="json", xhr=True)
	#config.add_static_view(name='static', path='/Users/tim2/nyb/python')
	app = config.make_wsgi_app()
	listener = eventlet.listen((host, port))
	wsgi.server(listener, app)