planetstack/observer/event_manager.py

   1 import threading
   2 import requests, json
   3
   4 from core.models import *
   5 from planetstack.config import Config
   6 from observer.deleters import deleters
   7
   8 import os
   9 import base64
  10 from fofum import Fofum
  11 import json
  12
  13 # decorator that marks dispatachable event methods
  14 def event(func):
  15         setattr(func, 'event', func.__name__)
  16         return func
  17
  18 class EventHandler:
  19         # This code is currently not in use.
  20         def __init__(self):
  21         pass
  22
  23         @staticmethod
  24         def get_events():
  25                 events = []
  26                 for name in dir(EventHandler):
  27                         attribute = getattr(EventHandler, name)
  28                         if hasattr(attribute, 'event'):
  29                                 events.append(getattr(attribute, 'event'))
  30                 return events
  31
  32         def dispatch(self, event, *args, **kwds):
  33                 if hasattr(self, event):
  34                         return getattr(self, event)(*args, **kwds)
  35
  36
  37 class EventSender:
  38         def __init__(self,user=None,clientid=None):
  39                 try:
  40                         clid = Config().feefie_client_id
  41                         user = Config().feefie_client_user
  42                 except:
  43                         clid = 'planetstack_core_team'
  44                         user = 'pl'
  45
  46                 self.fofum = Fofum(user=user)
  47                 self.fofum.make(clid)
  48
  49         def fire(self,**args):
  50                 self.fofum.fire(json.dumps(args))
  51
  52 class EventListener:
  53         def __init__(self,wake_up=None):
  54                 self.handler = EventHandler()
  55                 self.wake_up = wake_up
  56
  57         def handle_event(self, payload):
  58                 payload_dict = json.loads(payload)
  59
  60                 try:
  61                         deletion = payload_dict['deletion_flag']
  62                         if (deletion):
  63                                 model = payload_dict['model']
  64                                 pk = payload_dict['pk']
  65
  66                                 for deleter in deleters[model]:
  67                                         deleter(pk)
  68                 except:
  69                         deletion = False
  70
  71                 if (not deletion and self.wake_up):
  72                         self.wake_up()
  73
  74
  75         def run(self):
  76                 # This is our unique client id, to be used when firing and receiving events
  77                 # It needs to be generated once and placed in the config file
  78
  79                 try:
  80                         clid = Config().feefie_client_id
  81                         user = Config().feefie_client_user
  82                 except:
  83                         clid = 'planetstack_core_team'
  84                         user = 'pl'
  85
  86                 f = Fofum(user=user)
  87
  88                 listener_thread = threading.Thread(target=f.listen_for_event,args=(clid,self.handle_event))
  89                 listener_thread.start()