sparts 0.7.3

Service

sparts.vtask.VService - This is the core of any sparts service.

Simply subclass VService for any custom service instance logic, and run its initFromCLI() and you are done.

For example, myservice.py:

from sparts.vservice import VService
class MyService(VService):
    pass

MyService.initFromCLI()

Now, you can run this file with the -h option (to see the available options), or run with: python myservice.py

This should emit something like the following output:

DEBUG:VService:All tasks started``

And pressing ^C will emit:

^CINFO:VService:KeyboardInterrupt Received!  Stopping Tasks...
INFO:VService:Instance shut down gracefully

This simple service, by itself, is pretty damn useless. That’s where Tasks come into play

Tasks

sparts.vtask.VTask - This is the base class for all tasks

Tasks are what trigger your program to take action. This action can be processing periodic events, handling HTTP requests, handling thrift requests, working on items from a queue, waking up on an event, operating some ioloop, or whatever.

Here’s a simple example of a service with tasks (requires tornado installed):

from sparts.vservice import VService
from sparts.tasks.tornado import TornadoHTTPTask
TornadoHTTPTask.register()
VService.initFromCLI()

Now running it emits:

> python myservice.py --http-port 8000
INFO:VService.TornadoHTTPTask:TornadoHTTPTask Server Started on 0.0.0.0 (port 8000)
INFO:VService.TornadoHTTPTask:TornadoHTTPTask Server Started on :: (port 8000)
DEBUG:MyService:All tasks started

And as you can see, you can curl the webserver:

> curl localhost:8000
Hello, world

Tasks can be subclassed to do all kinds of things. This one prints the current unix timestamp every second:

from sparts.tasks.periodic import PeriodicTask

class PrintClock(PeriodicTask):
    INTERVAL = 1.0
    def execute(self):
        print time.time()
PrintClock.register()

from sparts.vservice import VService
VService.initFromCLI()

And the result:

DEBUG:VService:All tasks started
DEBUG:VService:VService Active.  Awaiting graceful shutdown.
1376081805.08
1376081806.08
1376081807.08
1376081808.08
1376081809.08
1376081810.08
1376081811.08