From: Sapan Bhatia <gwsapan@gmail.com>
Date: Wed, 16 Oct 2013 17:26:05 +0000 (-0400)
Subject: Set observer/disabled=1 to run an observerless PlanetStack
X-Git-Url: http://git.onelab.eu/?a=commitdiff_plain;h=9c2c8fa92c81666bde7a97ecd4df1a4262704b11;hp=808b239586c8b082d7bb51c26c6c5eb26a83e720;p=plstackapi.git

Set observer/disabled=1 to run an observerless PlanetStack
---

diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index dcc3c39..b64df5f 100644
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -1,62 +1,59 @@
 import os
 from django.db import models
 from django.forms.models import model_to_dict
-from observer.event_manager import EventSender
-
+# This is a no-op if observer_disabled is set to 1 in the config file
+from observer import *
 
 class PlCoreBase(models.Model):
 
-	created = models.DateTimeField(auto_now_add=True)
-	updated = models.DateTimeField(auto_now=True)
-	enacted = models.DateTimeField(null=True, default=None)
-
-	class Meta:
-		abstract = True
-		app_label = "core"
-
-	def __init__(self, *args, **kwargs):
-		super(PlCoreBase, self).__init__(*args, **kwargs)
-		self.__initial = self._dict
-
-	@property
-	def diff(self):
-		d1 = self.__initial
-		d2 = self._dict
-		diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
-		return dict(diffs)
-
-	@property
-	def has_changed(self):
-		return bool(self.diff)
-
-	@property
-	def changed_fields(self):
-		return self.diff.keys()
-
-	def get_field_diff(self, field_name):
-		return self.diff.get(field_name, None)
-
-	def delete(self, *args, **kwds):
-		super(PlCoreBase, self).delete(*args, **kwds)
-
-		try:
-			EventSender().fire({'delete_flag':True,'model':self.__name__})
-		except:
-			# Investigate later. 
-			pass
-
-	def save(self, *args, **kwargs):
-		super(PlCoreBase, self).save(*args, **kwargs)
-		
-		# Tell the observer that the source database has been updated
-		#EventSender().fire()
-
-		self.__initial = self._dict
-
-	@property
-	def _dict(self):
-		return model_to_dict(self, fields=[field.name for field in
-							 self._meta.fields])
+    created = models.DateTimeField(auto_now_add=True)
+    updated = models.DateTimeField(auto_now=True)
+    enacted = models.DateTimeField(null=True, default=None)
+
+    class Meta:
+        abstract = True
+        app_label = "core"
+
+    def __init__(self, *args, **kwargs):
+        super(PlCoreBase, self).__init__(*args, **kwargs)
+        self.__initial = self._dict
+
+    @property
+    def diff(self):
+        d1 = self.__initial
+        d2 = self._dict
+        diffs = [(k, (v, d2[k])) for k, v in d1.items() if v != d2[k]]
+        return dict(diffs)
+
+    @property
+    def has_changed(self):
+        return bool(self.diff)
+
+    @property
+    def changed_fields(self):
+        return self.diff.keys()
+
+    def get_field_diff(self, field_name):
+        return self.diff.get(field_name, None)
+
+    def delete(self, *args, **kwds):
+        super(PlCoreBase, self).delete(*args, **kwds)
+
+        # This is a no-op if observer_disabled is set
+        notify_observer(model=self, delete=True)
+
+    def save(self, *args, **kwargs):
+        super(PlCoreBase, self).save(*args, **kwargs)
+        
+        # This is a no-op if observer_disabled is set
+        notify_observer()
+
+        self.__initial = self._dict
+
+    @property
+    def _dict(self):
+        return model_to_dict(self, fields=[field.name for field in
+                             self._meta.fields])
 
 
 
diff --git a/planetstack/observer/__init__.py b/planetstack/observer/__init__.py
index e69de29..b23caf2 100644
--- a/planetstack/observer/__init__.py
+++ b/planetstack/observer/__init__.py
@@ -0,0 +1,27 @@
+from planetstack.config import Config
+
+try:
+    observer_disabled = Config().observer_disabled
+except:
+    observer_disabled = False
+
+print_once = True
+
+if (not observer_disabled):
+    from .event_manager import EventSender
+
+    def notify_observer(model=None, delete=False):
+        try:
+            if (model and delete):
+                EventSender().fire({'delete_flag':delete,'model':model.__name__}) 
+            else:
+                EventSender().fire()
+        except Exception,e:
+            print "Exception in Observer. This should not disrupt the front end. %s"%str(e)
+
+else:
+    def notify_observer(model=None, delete=False):
+        if (print_once):
+            print "The observer is disabled"
+            print_once = False
+        return