Comments (1)
@mperezfra
I changed the service to resume on app on_resume()
Because the stop() code does not work, I previously made these changes #9 (comment)
In on_resume(), I detect no response from the service, and restart it. Restart requires an elegant termination.
I expect there are issues that I have not considered, but this appears to work on Windows and Android.
Code fragments:
main .py:
server.bind(b'/alive', self.alive_response)
# ask if the service is alive
def ask_service_alive(self):
self.im_alive = False
self.client.send_message(b'/alive', [])
# check for response after a short time
Clock.schedule_once(self.check_alive,0.1)
# the response, which we may not get
def alive_response(self, message):
self.im_alive = message.decode('utf8') == 'alive'
# check for no response
def check_alive(self, dt):
if not self.im_alive:
# lets hope whatever killed the service cleaned up afterwards
self.start_service()
# a user might hope this would resume a service
def on_resume(self):
if self.service:
self.ask_service_alive(True)
service.py :
def alive():
CLIENT.send_message(
b'/alive',
['alive'.encode('utf8'), ],
)
stopped = False
def stop(*_):
global stopped
stopped = True
if __name__ == '__main__':
SERVER = OSCThreadServer()
SERVER.listen('localhost', port=3000, default=True)
SERVER.bind(b'/ping', ping)
SERVER.bind(b'/stop', stop)
SERVER.bind(b'/alive', alive)
SERVER.getaddress()
while True:
sleep(1)
if stopped:
break
send_date()
SERVER.terminate_server()
sleep(0.1)
SERVER.close()
The choice to restart the service on_resume() is totally arbitrary. One could perhaps have two services restarting each other......
The unanswered question is what causes Android to stop the service? ( other than because it can)
These are not exactly helpful:
https://developer.android.com/guide/components/services#Basics
https://developer.android.com/reference/android/app/Service
More interesting how can one write a service that is unlikely to be stopped?
I have not seen an Android stop yet, but I'm restarting; and because of the way the demo is written I wouldn't.
from kivy_service_osc.
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