pass pk and model_dict to deleter, dynamic load of deleters

[plstackapi.git] / planetstack / observer / event_manager.py

diff --git a/planetstack/observer/event_manager.py b/planetstack/observer/event_manager.py
index 8ec3fc2..112564a 100644 (file)
--- a/planetstack/observer/event_manager.py
+++ b/planetstack/observer/event_manager.py
@@ -2,13 +2,16 @@ import threading
 import requests, json
 
 from planetstack.config import Config
-from observer.deleters import deleters
+from observer.deleter import Deleter
 
 import uuid
 import os
+import imp
+import inspect
 import base64
 from fofum import Fofum
 import json
+import traceback
 
 # decorator that marks dispatachable event methods       
 def event(func):
@@ -52,29 +55,61 @@ class EventSender:
 
        def fire(self,**kwargs):
                 kwargs["uuid"] = str(uuid.uuid1())
-                print "YYY fire", kwargs
                self.fofum.fire(json.dumps(kwargs))
 
 class EventListener:
        def __init__(self,wake_up=None):
                self.handler = EventHandler()
                self.wake_up = wake_up
+                self.deleters = {}
+                self.load_deleter_modules()
+
+        def load_deleter_modules(self, deleter_dir=None):
+            if deleter_dir is None:
+                if hasattr(Config(), "observer_deleters_dir"):
+                    deleter_dir = Config().observer_deleters_dir
+                else:
+                    deleter_dir = "/opt/planetstack/observer/deleters"
+
+            for fn in os.listdir(deleter_dir):
+                pathname = os.path.join(deleter_dir,fn)
+                if os.path.isfile(pathname) and fn.endswith(".py") and (fn!="__init__.py"):
+                    module = imp.load_source(fn[:-3],pathname)
+                    for classname in dir(module):
+                        c = getattr(module, classname, None)
+
+                        # make sure 'c' is a descendent of Deleter and has a
+                        # provides field (this eliminates the abstract base classes
+                        # since they don't have a provides)
+
+                        if inspect.isclass(c) and issubclass(c, Deleter) and hasattr(c,"model") and c.model!=None:
+                            modelName = c.model
+                            if not modelName in self.deleters:
+                                self.deleters[modelName] = []
+                            if not (c in self.deleters[modelName]):
+                                self.deleters[modelName].append(c)
+            print 'loaded deleters: %s' % ",".join(self.deleters.keys())
+
 
        def handle_event(self, payload):
                payload_dict = json.loads(payload)
 
                try:
                        deletion = payload_dict.get('delete_flag', False)
-                        print "XXX", payload_dict, deletion
                        if (deletion):
                                model = payload_dict['model']
                                pk = payload_dict['pk']
+                                model_dict = payload_dict['model_dict']
 
-                                print "XXX", model, pk, deleters
+                               for deleter in self.deleters[model]:
+                                        try:
+                                           deleter()(pk, model_dict)
+                                        except:
+                                            # something is silently eating these
+                                            # exceptions...
+                                            traceback.print_exc()
+                                            raise
 
-                               for deleter in deleters[model]:
-                                        print "ZZZ executing deleter"
-                                       deleter(pk)
                except:
                        deletion = False