signals_thing

signals.py

from flask import Flask, current_app

#Import Namespace from blinker, use this as your custom namespace for signals. You can change this but most folk
#just use the provided one.
from blinker import Namespace

#Just some flask boiler plate
app = Flask(__name__)
app.secret_key = 'DND'

 #Call the Namespace() method from blinker and assign it to our variable sample_signal. This should intialise the namespace
 # for the signals and setup sample_signal to process signals
sample_signal = Namespace()


# Just a method definition which matches the prototype for the signal we'll create
def foobar_signal(app, message, **extra):
    print(message)


#Uses the sample_signal we created above to establish the a named signal called signal_handler_example. This acts as our
#reference to the queue/bus/etc and is how stuff gets sent between events and the subscribers.
foobar = sample_signal.signal('signal_handler_example')

#The subscriber. This  says that our foobar_signal method will be triggered by events from the flask app method, connected together 
#via our signal_handler_example which is assigned to foobar
foobar.connect(foobar_signal, app)


#Generic flask stuff. With this 
@app.route('/', methods=['POST', 'GET'])
def home():
    #Here we're calling the signal we created above to explicitly tell it to send messages to the signal_handler_example signal and
    #trigger foobar_signal
    foobar.send(current_app._get_current_object(), message='Hi')
    foobar.send(current_app._get_current_object(), message='Hi')
    foobar.send(current_app._get_current_object(), message='Hi')
    return 'toot'


if __name__ == '__main__':
app.run(debug=True, port=5002)