diff --git a/planetstack.deps b/planetstack.deps
new file mode 100644
index 0000000..6eae1fc
--- /dev/null
+++ b/planetstack.deps
@@ -0,0 +1,47 @@
+{
+    "Node": [
+        "Site", 
+        "Deployment"
+    ], 
+    "Slice": [
+        "Site"
+    ], 
+    "ReservedResource": [
+        "Sliver"
+    ], 
+    "SliceMembership": [
+        "User", 
+        "Slice", 
+        "Role"
+    ], 
+    "NetworkSlice": [
+        "Network", 
+        "Slice"
+    ], 
+    "Tag": [
+        "Project"
+    ], 
+    "User": [
+        "Site"
+    ], 
+    "SliceTag": [
+        "Slice"
+    ], 
+    "Reservation": [
+        "Slice"
+    ], 
+    "NetworkSliver": [
+        "Network", 
+        "Sliver"
+    ], 
+    "SitePrivilege": [
+        "User", 
+        "Site", 
+        "Role"
+    ], 
+    "Sliver": [
+        "Image", 
+        "Slice", 
+        "Node"
+    ]
+}
diff --git a/planetstack/core/models/plcorebase.py b/planetstack/core/models/plcorebase.py
index 30d4df3..00dc2d0 100644
--- a/planetstack/core/models/plcorebase.py
+++ b/planetstack/core/models/plcorebase.py
@@ -8,7 +8,6 @@
 
     created = models.DateTimeField(auto_now_add=True)
     updated = models.DateTimeField(auto_now=True)
-    enacted = models.DateTimeField(null=True, default=None)
 
     class Meta:
         abstract = True
diff --git a/planetstack/observer/event_loop.py b/planetstack/observer/event_loop.py
new file mode 100644
index 0000000..649918b
--- /dev/null
+++ b/planetstack/observer/event_loop.py
@@ -0,0 +1,235 @@
+import time
+import traceback
+import commands
+import threading
+import json
+
+from datetime import datetime
+from collections import defaultdict
+from core.models import *
+from django.db.models import F, Q
+from openstack.manager import OpenStackManager
+from util.logger import Logger, logging, logger
+#from timeout import timeout
+
+debug_mode = False
+
+logger = Logger(logfile='observer.log', level=logging.INFO)
+
+class StepNotReady(Exception):
+	pass
+
+def toposort(g, steps):
+	reverse = {}
+
+	for k,v in g.items():
+		for rk in v:
+			try:
+				reverse[rk].append(k)
+			except:
+				reverse[rk]=k
+
+	sources = []
+	for k,v in g.items():
+		if not reverse.has_key(k):
+			sources.append(k)
+
+
+	for k,v in reverse.iteritems():
+		if (not v):
+			sources.append(k)
+
+	order = []
+	marked = []
+	while sources:
+		n = sources.pop()
+		try:
+			for m in g[n]:
+				if m not in marked:
+					sources.append(m)
+					marked.append(m)
+		except KeyError:
+			pass
+		if (n in steps):
+			order.append(n)
+
+	return order
+
+class PlanetStackObserver:
+	sync_steps = ['SyncNetworks','SyncNetworkSlivers','SyncSites','SyncSitePrivileges','SyncSlices','SyncSliceMemberships','SyncSlivers','SyncSliverIps']
+
+	def __init__(self):
+		self.manager = OpenStackManager()
+		# The Condition object that gets signalled by Feefie events
+		self.load_sync_steps()
+		self.event_cond = threading.Condition()
+		self.load_enacted()
+
+	def wait_for_event(self, timeout):
+		self.event_cond.acquire()
+		self.event_cond.wait(timeout)
+		self.event_cond.release()
+		
+	def wake_up(self):
+		logger.info('Wake up routine called. Event cond %r'%self.event_cond)
+		self.event_cond.acquire()
+		self.event_cond.notify()
+		self.event_cond.release()
+
+	def load_sync_steps(self):
+		dep_path = Config().pl_dependency_path
+		try:
+			# This contains dependencies between records, not sync steps
+			self.model_dependency_graph = json.loads(open(dep_path).read())
+		except Exception,e:
+			raise e
+
+		backend_path = Config().backend_dependency_path
+		try:
+			# This contains dependencies between backend records
+			self.backend_dependency_graph = json.loads(open(backend_path).read())
+		except Exception,e:
+			raise e
+
+		provides_dict = {}
+		for s in sync_steps:
+			for m in s.provides:
+				provides_dict[m]=s.__name__
+				
+		step_graph = {}
+		for k,v in model_dependency_graph.iteritems():
+			try:
+				source = provides_dict[k]
+				for m in v:
+					try:
+						dest = provides_dict[m]
+					except KeyError:
+						pass
+						# no deps, pass
+					step_graph[source]=dest
+					
+			except KeyError:
+				pass
+				# no dependencies, pass
+		
+		if (backend_dependency_graph):
+			backend_dict = {}
+			for s in sync_steps:
+				for m in s.serves:
+					backend_dict[m]=s.__name__
+					
+			for k,v in backend_dependency_graph.iteritems():
+				try:
+					source = backend_dict[k]
+					for m in v:
+						try:
+							dest = backend_dict[m]
+						except KeyError:
+							# no deps, pass
+							pass
+						step_graph[source]=dest
+						
+				except KeyError:
+					pass
+					# no dependencies, pass
+
+		dependency_graph = step_graph
+
+		self.ordered_steps = toposort(dependency_graph, steps)
+		self.load_run_times()
+		
+
+	def check_duration(self):
+		try:
+			if (duration > S.deadline):
+				logger.info('Sync step %s missed deadline, took %.2f seconds'%(S.name,duration))
+		except AttributeError:
+			# S doesn't have a deadline
+			pass
+
+	def update_run_time(self, step):
+		self.last_run_times[step.name]=time.time()
+
+	def check_schedule(self, step):
+		time_since_last_run = time.time() - self.last_run_times[step.name]
+		try:
+			if (time_since_last_run < step.requested_interval):
+				raise StepNotReady
+		except AttributeError:
+			logger.info('Step %s does not have requested_interval set'%step.name)
+			raise StepNotReady
+	
+	def load_run_times(self):
+		try:
+			jrun_times = open('/tmp/observer_run_times').read()
+			self.last_run_times = json.loads(jrun_times)
+		except:
+			self.last_run_times={}
+			for e in self.ordered_steps:
+				self.last_run_times[e.name]=0
+
+
+
+	def save_run_times(self):
+		run_times = json.dumps(self.last_run_times)
+		open('/tmp/observer_run_times','w').write(run_times)
+
+	def check_class_dependency(self, step, failed_steps):
+		for failed_step in failed_steps:
+			if (failed_step in self.dependency_graph[step.name]):
+				raise StepNotReady
+
+	def run(self):
+		if not self.manager.enabled or not self.manager.has_openstack:
+			return
+
+		while True:
+			try:
+				logger.info('Waiting for event')
+				tBeforeWait = time.time()
+				self.wait_for_event(timeout=300)
+				logger.info('Observer woke up')
+
+				# Set of whole steps that failed
+				failed_steps = []
+
+				# Set of individual objects within steps that failed
+				failed_step_objects = []
+
+				for S in self.ordered_steps:
+					start_time=time.time()
+					
+					sync_step = S()
+					sync_step.dependencies = self.dependencies[sync_step.name]
+					sync_step.debug_mode = debug_mode
+
+					should_run = False
+					try:
+						# Various checks that decide whether
+						# this step runs or not
+						self.check_class_dependency(sync_step, failed_steps) # dont run Slices if Sites failed
+						self.check_schedule(sync_step) # dont run sync_network_routes if time since last run < 1 hour
+						should_run = True
+					except StepNotReady:
+						logging.info('Step not ready: %s'%sync_step.name)
+						failed_steps.add(sync_step)
+					except:
+						failed_steps.add(sync_step)
+
+					if (should_run):
+						try:
+							duration=time.time() - start_time
+
+							# ********* This is the actual sync step
+							failed_objects = sync_step(failed=failed_step_objects)
+
+
+							check_deadline(sync_step, duration)
+							failed_step_objects.extend(failed_objects)
+							self.update_run_time(sync_step)
+						except:
+							failed_steps.add(S)
+				self.save_run_times()
+			except:
+				logger.log_exc("Exception in observer run loop")
+				traceback.print_exc()
diff --git a/planetstack/observer/openstacksyncstep.py b/planetstack/observer/openstacksyncstep.py
new file mode 100644
index 0000000..3ce3c68
--- /dev/null
+++ b/planetstack/observer/openstacksyncstep.py
@@ -0,0 +1,17 @@
+import os
+import base64
+from syncstep import SyncStep
+
+class OpenStackSyncStep:
+	""" PlanetStack Sync step for copying data to OpenStack 
+	""" 
+	
+	def __init__(self, **args):
+		super(SyncStep,self).__init__(**args)
+		return
+
+	
+
+
+	def __call__(self):
+		return self.call()
diff --git a/planetstack/observer/steps/__init__.py b/planetstack/observer/steps/__init__.py
new file mode 100644
index 0000000..a239587
--- /dev/null
+++ b/planetstack/observer/steps/__init__.py
@@ -0,0 +1,10 @@
+from .syncexternalroutes import SyncExternalRoutes
+from .syncnetworkslivers import SyncNetworkSlivers
+from .syncnetworks import SyncNetworks
+from .syncsiteprivileges import SyncSitePrivileges
+from .syncsites import SyncSites
+from .syncslicememberships import SyncSliceMemberships
+from .syncslices import SyncSlices
+from .syncsliverips import SyncSliverIps
+from .syncslivers import SyncSlivers
+from .syncusers import SyncUsers
diff --git a/planetstack/observer/steps/sync_external_routes.py b/planetstack/observer/steps/sync_external_routes.py
new file mode 100644
index 0000000..fda66bd
--- /dev/null
+++ b/planetstack/observer/steps/sync_external_routes.py
@@ -0,0 +1,16 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncExternalRoutes(SyncStep):
+	# XXX what does this provide?
+	requested_interval = 86400 # This step is slow like a pig. Let's run it infrequently
+
+	def call(self):
+		routes = self.manager.driver.get_external_routes()
+        subnets = self.manager.driver.shell.quantum.list_subnets()['subnets']
+        for subnet in subnets:
+            try:
+                self.manager.driver.add_external_route(subnet, routes)
+            except:
+                logger.log_exc("failed to add external route for subnet %s" % subnet)
diff --git a/planetstack/observer/steps/sync_network_slivers.py b/planetstack/observer/steps/sync_network_slivers.py
new file mode 100644
index 0000000..3870924
--- /dev/null
+++ b/planetstack/observer/steps/sync_network_slivers.py
@@ -0,0 +1,73 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncNetworkSlivers(OpenStackSyncStep):
+	requested_interval = 3600
+	provides=[NetworkSliver]
+
+	def call(self):
+        networkSlivers = NetworkSliver.objects.all()
+        networkSlivers_by_id = {}
+        networkSlivers_by_port = {}
+        for networkSliver in networkSlivers:
+            networkSlivers_by_id[networkSliver.id] = networkSliver
+            networkSlivers_by_port[networkSliver.port_id] = networkSliver
+
+        networks = Network.objects.all()
+        networks_by_id = {}
+        for network in networks:
+            networks_by_id[network.network_id] = network
+
+        slivers = Sliver.objects.all()
+        slivers_by_instance_id = {}
+        for sliver in slivers:
+            slivers_by_instance_id[sliver.instance_id] = sliver
+
+        ports = self.manager.driver.shell.quantum.list_ports()["ports"]
+        for port in ports:
+            if port["id"] in networkSlivers_by_port:
+                # we already have it
+                print "already accounted for port", port["id"]
+                continue
+
+            if port["device_owner"] != "compute:nova":
+                # we only want the ports that connect to instances
+                continue
+
+            network = networks_by_id.get(port['network_id'], None)
+            if not network:
+                #print "no network for port", port["id"], "network", port["network_id"]
+                continue
+
+            sliver = slivers_by_instance_id.get(port['device_id'], None)
+            if not sliver:
+                print "no sliver for port", port["id"], "device_id", port['device_id']
+                continue
+
+            if network.template.sharedNetworkId is not None:
+                # If it's a shared network template, then more than one network
+                # object maps to the quantum network. We have to do a whole bunch
+                # of extra work to find the right one.
+                networks = network.template.network_set.all()
+                network = None
+                for candidate_network in networks:
+                    if (candidate_network.owner == sliver.slice):
+                        print "found network", candidate_network
+                        network = candidate_network
+
+                if not network:
+                    print "failed to find the correct network for a shared template for port", port["id"], "network", port["network_id"]
+                    continue
+
+            if not port["fixed_ips"]:
+                print "port", port["id"], "has no fixed_ips"
+                continue
+
+#            print "XXX", port
+
+            ns = NetworkSliver(network=network,
+                               sliver=sliver,
+                               ip=port["fixed_ips"][0]["ip_address"],
+                               port_id=port["id"])
+            ns.save()
diff --git a/planetstack/observer/steps/sync_networks.py b/planetstack/observer/steps/sync_networks.py
new file mode 100644
index 0000000..eb8fe86
--- /dev/null
+++ b/planetstack/observer/steps/sync_networks.py
@@ -0,0 +1,51 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncNetworks(OpenStackSyncStep):
+	provides=[Network]
+	requested_interval = 0
+
+	def save_network(self, network):
+		if not network.network_id:
+            if network.template.sharedNetworkName:
+                network.network_id = network.template.sharedNetworkId
+                (network.subnet_id, network.subnet) = self.driver.get_network_subnet(network.network_id)
+            else:
+                network_name = network.name
+
+                # create network
+                os_network = self.driver.create_network(network_name, shared=True)
+                network.network_id = os_network['id']
+
+                # create router
+                router = self.driver.create_router(network_name)
+                network.router_id = router['id']
+
+                # create subnet
+                next_subnet = self.get_next_subnet()
+                cidr = str(next_subnet.cidr)
+                ip_version = next_subnet.version
+                start = str(next_subnet[2])
+                end = str(next_subnet[-2])
+                subnet = self.driver.create_subnet(name=network_name,
+                                                   network_id = network.network_id,
+                                                   cidr_ip = cidr,
+                                                   ip_version = ip_version,
+                                                   start = start,
+                                                   end = end)
+                network.subnet = cidr
+                network.subnet_id = subnet['id']
+
+	@require_enabled
+	def sync_record(self, site):
+		if network.owner and network.owner.creator:
+                try:
+                    # update manager context
+                    self.driver.init_caller(network.owner.creator, network.owner.name)
+                    self.save_network(network)
+                    logger.info("saved network: %s" % (network))
+                except Exception,e:
+                    logger.log_exc("save network failed: %s" % network)	
+					raise e
+
diff --git a/planetstack/observer/steps/sync_site_privileges.py b/planetstack/observer/steps/sync_site_privileges.py
new file mode 100644
index 0000000..273fd33
--- /dev/null
+++ b/planetstack/observer/steps/sync_site_privileges.py
@@ -0,0 +1,13 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncSitePrivileges(OpenStackSyncStep):
+	requested_interval=0
+
+	provides=[SitePrivilege]
+	def sync_record(self, user):
+	   if site_priv.user.kuser_id and site_priv.site.tenant_id:
+			self.driver.add_user_role(site_priv.user.kuser_id,
+									  site_priv.site.tenant_id,
+									  site_priv.role.role_type) 
diff --git a/planetstack/observer/steps/sync_sites.py b/planetstack/observer/steps/sync_sites.py
new file mode 100644
index 0000000..59f32e6
--- /dev/null
+++ b/planetstack/observer/steps/sync_sites.py
@@ -0,0 +1,27 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncSites(OpenStackSyncStep):
+	provides=[Site]
+	requested_interval=0
+	def sync_record(self, site):
+		save_site = False
+		if not site.tenant_id:
+			tenant = self.driver.create_tenant(tenant_name=site.login_base,
+											   description=site.name,
+											   enabled=site.enabled)
+			site.tenant_id = tenant.id
+			save_site = True
+			# XXX - What's caller?
+			# self.driver.add_user_role(self.caller.kuser_id, tenant.id, 'admin')
+
+		# update the record
+		if site.id and site.tenant_id:
+			self.driver.update_tenant(site.tenant_id,
+									  description=site.name,
+									  enabled=site.enabled)
+
+		if (save_site):
+			site.save() # 
+
diff --git a/planetstack/observer/steps/sync_slice_memberships.py b/planetstack/observer/steps/sync_slice_memberships.py
new file mode 100644
index 0000000..c97bd49
--- /dev/null
+++ b/planetstack/observer/steps/sync_slice_memberships.py
@@ -0,0 +1,13 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncSliceMemberships(OpenStackSyncStep):
+	requested_interval=0
+	provides=[SliceMembership]
+	def sync_record(self, user):
+		if slice_memb.user.kuser_id and slice_memb.slice.tenant_id:
+				self.driver.add_user_role(slice_memb.user.kuser_id,
+										  slice_memb.slice.tenant_id,
+										  slice_memb.role.role_type)	
+	   
diff --git a/planetstack/observer/steps/sync_slices.py b/planetstack/observer/steps/sync_slices.py
new file mode 100644
index 0000000..fb787db
--- /dev/null
+++ b/planetstack/observer/steps/sync_slices.py
@@ -0,0 +1,56 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncSlices(OpenStackSyncStep):
+	provides=[Slice]
+	requested_interval=0
+	def sync_record(self, slice):
+		if not slice.tenant_id:
+            nova_fields = {'tenant_name': slice.name,
+                   'description': slice.description,
+                   'enabled': slice.enabled}
+            tenant = self.driver.create_tenant(**nova_fields)
+            slice.tenant_id = tenant.id
+
+            # XXX give caller an admin role at the tenant they've created
+            self.driver.add_user_role(self.caller.kuser_id, tenant.id, 'admin')
+
+            # refresh credentials using this tenant
+            self.driver.shell.connect(username=self.driver.shell.keystone.username,
+                                      password=self.driver.shell.keystone.password,
+                                      tenant=tenant.name)
+
+            # create network
+            network = self.driver.create_network(slice.name)
+            slice.network_id = network['id']
+
+            # create router
+            router = self.driver.create_router(slice.name)
+            slice.router_id = router['id']
+
+            # create subnet
+            next_subnet = self.get_next_subnet()
+            cidr = str(next_subnet.cidr)
+            ip_version = next_subnet.version
+            start = str(next_subnet[2])
+            end = str(next_subnet[-2]) 
+            subnet = self.driver.create_subnet(name=slice.name,
+                                               network_id = network['id'],
+                                               cidr_ip = cidr,
+                                               ip_version = ip_version,
+                                               start = start,
+                                               end = end)
+            slice.subnet_id = subnet['id']
+            # add subnet as interface to slice's router
+            self.driver.add_router_interface(router['id'], subnet['id'])
+            # add external route
+            self.driver.add_external_route(subnet)
+
+
+        if slice.id and slice.tenant_id:
+            self.driver.update_tenant(slice.tenant_id,
+                                      description=slice.description,
+                                      enabled=slice.enabled)   
+
+        slice.save()
diff --git a/planetstack/observer/steps/sync_sliver_ips.py b/planetstack/observer/steps/sync_sliver_ips.py
new file mode 100644
index 0000000..93f8cb3
--- /dev/null
+++ b/planetstack/observer/steps/sync_sliver_ips.py
@@ -0,0 +1,23 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncSliverIps(OpenStackSyncStep):
+	provides=[Sliver]
+	requested_interval=0
+	def fetch_pending(self):
+		slivers = Sliver.objects.filter(ip=None)
+		return slivers
+
+	def sync_record(self, sliver):
+		self.manager.init_admin(tenant=sliver.slice.name)
+		servers = self.manager.driver.shell.nova.servers.findall(id=sliver.instance_id)
+		if not servers:
+			continue
+		server = servers[0]
+		ips = server.addresses.get(sliver.slice.name, [])
+		if not ips:
+			continue
+		sliver.ip = ips[0]['addr']
+		sliver.save()
+		logger.info("saved sliver ip: %s %s" % (sliver, ips[0]))
diff --git a/planetstack/observer/steps/sync_slivers.py b/planetstack/observer/steps/sync_slivers.py
new file mode 100644
index 0000000..46f78fd
--- /dev/null
+++ b/planetstack/observer/steps/sync_slivers.py
@@ -0,0 +1,27 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncSlivers(OpenStackSyncStep):
+	provides=[Sliver]
+	requested_interval=0
+	def sync_record(self, slice):
+		if not sliver.instance_id:
+				nics = self.get_requested_networks(sliver.slice)
+				file("/tmp/scott-manager","a").write("slice: %s\nreq: %s\n" % (str(sliver.slice.name), str(nics)))
+				slice_memberships = SliceMembership.objects.filter(slice=sliver.slice)
+				pubkeys = [sm.user.public_key for sm in slice_memberships if sm.user.public_key]
+				pubkeys.append(sliver.creator.public_key)
+				instance = self.driver.spawn_instance(name=sliver.name,
+									   key_name = sliver.creator.keyname,
+									   image_id = sliver.image.image_id,
+									   hostname = sliver.node.name,
+									   pubkeys = pubkeys,
+									   nics = nics )
+				sliver.instance_id = instance.id
+				sliver.instance_name = getattr(instance, 'OS-EXT-SRV-ATTR:instance_name')
+
+			if sliver.instance_id and ("numberCores" in sliver.changed_fields):
+				self.driver.update_instance_metadata(sliver.instance_id, {"cpu_cores": str(sliver.numberCores)})
+
+			sliver.save()	
diff --git a/planetstack/observer/steps/sync_users.py b/planetstack/observer/steps/sync_users.py
new file mode 100644
index 0000000..1e93034
--- /dev/null
+++ b/planetstack/observer/steps/sync_users.py
@@ -0,0 +1,33 @@
+import os
+import base64
+from planetstack.config import Config
+
+class SyncUsers(OpenStackSyncStep):
+	provides=[User]
+	requested_interval=0
+	def sync_record(self, user):
+        name = user.email[:user.email.find('@')]
+        user_fields = {'name': name,
+                       'email': user.email,
+                       'password': hashlib.md5(user.password).hexdigest()[:6],
+                       'enabled': True}
+        if not user.kuser_id:
+            keystone_user = self.driver.create_user(**user_fields)
+            user.kuser_id = keystone_user.id
+        else:
+            self.driver.update_user(user.kuser_id, user_fields)     
+
+        if user.site:
+            self.driver.add_user_role(user.kuser_id, user.site.tenant_id, 'user')
+            if user.is_admin:
+                self.driver.add_user_role(user.kuser_id, user.site.tenant_id, 'admin')
+            else:
+                # may have admin role so attempt to remove it
+                self.driver.delete_user_role(user.kuser_id, user.site.tenant_id, 'admin')
+
+        if user.public_key:
+            self.init_caller(user, user.site.login_base)
+            self.save_key(user.public_key, user.keyname)
+            self.init_admin()
+
+        user.save()
diff --git a/planetstack/observer/syncstep.py b/planetstack/observer/syncstep.py
new file mode 100644
index 0000000..f3eb4ba
--- /dev/null
+++ b/planetstack/observer/syncstep.py
@@ -0,0 +1,62 @@
+import os
+import base64
+from planetstack.config import Config
+
+class FailedDependency(Exception):
+	pass
+
+class SyncStep:
+	""" A PlanetStack Sync step. 
+
+	Attributes:
+		psmodel		Model name the step synchronizes 
+		dependencies	list of names of models that must be synchronized first if the current model depends on them
+	""" 
+	slow=False
+	def get_prop(prop):
+		try:
+			sync_config_dir = Config().sync_config_dir
+		except:
+			sync_config_dir = '/etc/planetstack/sync'
+		prop_config_path = '/'.join(sync_config_dir,self.name,prop)
+		return open(prop_config_path).read().rstrip()
+
+	def __init__(self, **args):
+		"""Initialize a sync step
+		   Keyword arguments:
+		   		name -- Name of the step
+				provides -- PlanetStack models sync'd by this step
+		"""
+		dependencies = []
+		try:
+			self.soft_deadline = int(self.get_prop('soft_deadline_seconds'))
+		except:
+			self.soft_deadline = 5 # 5 seconds
+
+		return
+
+	def fetch_pending(self):
+		return Sliver.objects.filter(ip=None)
+	
+	def check_dependencies(self, obj):
+		for dep in dependencies:
+			peer_object = getattr(obj, dep.name.lowercase())
+			if (peer_object.pk==dep.pk):
+				raise DependencyFailed
+
+	def call(self, failed=failed_objects):
+		pending = self.fetch_pending()
+		failed = []
+		for o in pending:
+			if (not self.depends_on(o, failed)):
+				try:
+					check_dependencies(o) # Raises exception if failed					
+					self.sync_record(o)
+					o.enacted = datetime.now() # Is this the same timezone? XXX
+					o.save(update_fields=['enacted'])
+				except:
+					failed.append(o)
+		return failed
+
+	def __call__(self):
+		return self.call()
diff --git a/planetstack/observer/toposort.py b/planetstack/observer/toposort.py
new file mode 100755
index 0000000..34bf6f5
--- /dev/null
+++ b/planetstack/observer/toposort.py
@@ -0,0 +1,48 @@
+#!/usr/bin/python
+
+import time
+import traceback
+import commands
+import threading
+import json
+
+from datetime import datetime
+from collections import defaultdict
+
+def toposort(g, steps):
+	reverse = {}
+
+	for k,v in g.items():
+		for rk in v:
+			try:
+				reverse[rk].append(k)
+			except:
+				reverse[rk]=k
+
+	sources = []
+	for k,v in g.items():
+		if not reverse.has_key(k):
+			sources.append(k)
+
+
+	for k,v in reverse.iteritems():
+		if (not v):
+			sources.append(k)
+
+	order = []
+	marked = []
+	while sources:
+		n = sources.pop()
+		try:
+			for m in g[n]:
+				if m not in marked:
+					sources.append(m)
+					marked.append(m)
+		except KeyError:
+			pass
+		if (n in steps):
+			order.append(n)
+
+	return order
+
+print toposort({'a':'b','b':'c','c':'d','d':'c'},['d','c','b','a'])
diff --git a/planetstack/openstack/backend.py b/planetstack/openstack/backend.py
index 2f4aa71..4e4b1e2 100644
--- a/planetstack/openstack/backend.py
+++ b/planetstack/openstack/backend.py
@@ -1,12 +1,12 @@
 import threading
-from openstack.observer import OpenStackObserver
+from openstack.observer import PlanetStackObserver
 from openstack.event_manager import EventListener
 
 class Backend:
     
     def run(self):
         # start the openstack observer
-        observer = OpenStackObserver()
+        observer = PlanetStackObserver()
         observer_thread = threading.Thread(target=observer.run)
         observer_thread.start()
 
diff --git a/planetstack/openstack/observer.py b/planetstack/openstack/observer.py
deleted file mode 100644
index d8c3c61..0000000
--- a/planetstack/openstack/observer.py
+++ /dev/null
@@ -1,479 +0,0 @@
-import time
-import traceback
-import commands
-import threading
-
-from datetime import datetime
-from collections import defaultdict
-from core.models import *
-from django.db.models import F, Q
-from openstack.manager import OpenStackManager
-from util.logger import Logger, logging, logger
-#from timeout import timeout
-
-
-logger = Logger(logfile='observer.log', level=logging.INFO)
-
-class OpenStackObserver:
-    
-    def __init__(self):
-        self.manager = OpenStackManager()
-        # The Condition object that gets signalled by Feefie events
-        self.event_cond = threading.Condition()
-
-    def wait_for_event(self, timeout):
-        self.event_cond.acquire()
-        self.event_cond.wait(timeout)
-        self.event_cond.release()
-        
-    def wake_up(self):
-        logger.info('Wake up routine called. Event cond %r'%self.event_cond)
-        self.event_cond.acquire()
-        self.event_cond.notify()
-        self.event_cond.release()
-
-    def run(self):
-        if not self.manager.enabled or not self.manager.has_openstack:
-            return
-        while True:
-            try:
-                start_time=time.time()
-                logger.info('Observer run loop')
-                #self.sync_roles()
-
-                logger.info('Calling sync tenants')
-                try:
-                    self.sync_tenants()
-                except:
-                    logger.log_exc("Exception in sync_tenants")
-                    traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync tenants took %f seconds'%(finish_time-start_time))
-
-                logger.info('Calling sync users')
-                try:
-                    self.sync_users()
-                except:
-                    logger.log_exc("Exception in sync_users")
-                    traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync users took %f seconds'%(finish_time-start_time))
-
-                logger.info('Calling sync tenant roles')
-                try:
-                    self.sync_user_tenant_roles()
-                except:
-                    logger.log_exc("Exception in sync_users")
-                    traceback.print_exc()
-
-                logger.info('Calling sync slivers')
-                try:
-                    self.sync_slivers()
-                except:
-                    logger.log_exc("Exception in sync slivers")
-                    traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync slivers took %f seconds'%(finish_time-start_time))
-
-                logger.info('Calling sync sliver ips')
-                try:
-                    self.sync_sliver_ips()
-                except:
-                    logger.log_exc("Exception in sync_sliver_ips")
-                    traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync sliver ips took %f seconds'%(finish_time-start_time))
-
-                logger.info('Calling sync networks')
-                try:
-                    self.sync_networks()
-                except:
-                    logger.log_exc("Exception in sync_networks")
-                    traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync networks took %f seconds'%(finish_time-start_time))
-
-                logger.info('Calling sync network slivers')
-                try:
-                    self.sync_network_slivers()
-                except:
-                    logger.log_exc("Exception in sync_network_slivers")
-                    traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync network sliver ips took %f seconds'%(finish_time-start_time))
-
-                logger.info('Calling sync external routes')
-                try:
-                    self.sync_external_routes()
-                except:
-                     logger.log_exc("Exception in sync_external_routes")
-                     traceback.print_exc()
-                finish_time = time.time()
-                logger.info('Sync external routes took %f seconds'%(finish_time-start_time))
-
-                logger.info('Waiting for event')
-                tBeforeWait = time.time()
-                self.wait_for_event(timeout=300)
-
-                # Enforce 5 minutes between wakeups
-                tSleep = 300 - (time.time() - tBeforeWait)
-                if tSleep > 0:
-                    logger.info('Sleeping for %d seconds' % tSleep)
-                    time.sleep(tSleep)
-
-                logger.info('Observer woken up')
-            except:
-                logger.log_exc("Exception in observer run loop")
-                traceback.print_exc()
-
-    def sync_roles(self):
-        """
-        save all role that don't already exist in keystone. Remove keystone roles that
-        don't exist in planetstack
-        """
-        # sync all roles that don't already in keystone  
-        keystone_roles = self.manager.driver.shell.keystone.roles.findall()
-        keystone_role_names = [kr.name for kr in keystone_roles]
-        pending_roles = Role.objects.all()
-        pending_role_names = [r.role_type for r in pending_roles] 
-        for role in pending_roles:
-            if role.role_type not in keystone_role_names:
-                try:
-                    self.manager.save_role(role)
-                    logger.info("save role: %s" % (role))
-                except:
-                    logger.log_exc("save role failed: %s" % role)  
-                    traceback.print_exc()
-
-        # don't delete roles for now 
-        """ 
-        # delete keystone roles that don't exist in planetstack
-        for keystone_role in keystone_roles:
-            if keystone_role.name == 'admin':
-                continue
-            if keystone_role.name not in pending_role_names:
-                try:
-                    self.manager.driver.delete_role({id: keystone_role.id})
-                except:
-                    traceback.print_exc()
-        """
-
-    def sync_tenants(self):
-        """
-        Save all sites and sliceswhere enacted < updated or enacted == None. 
-        Remove sites and slices that no don't exist in openstack db if they 
-        have an enacted time (enacted != None).
-        """ 
-        # get all sites that need to be synced (enacted < updated or enacted is None)
-        pending_sites = Site.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for site in pending_sites:
-            try:
-                self.manager.save_site(site)
-                logger.info("saved site %s" % site)
-            except:
-                logger.log_exc("save site failed: %s" % site)
-
-        # get all slices that need to be synced (enacted < updated or enacted is None)
-        pending_slices = Slice.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for slice in pending_slices:
-            try:
-                self.manager.init_caller(slice.creator, slice.creator.site.login_base)
-                self.manager.save_slice(slice)
-                logger.info("saved slice %s" % slice)
-            except:
-                logger.log_exc("save slice failed: %s" % slice)
-
-        # get all sites that where enacted != null. We can assume these sites
-        # have previously been synced and need to be checed for deletion.
-        sites = Site.objects.filter(enacted__isnull=False)
-        site_dict = {}
-        for site in sites:
-            site_dict[site.login_base] = site
-
-        # get all slices that where enacted != null. We can assume these slices
-        # have previously been synced and need to be checed for deletion.
-        slices = Slice.objects.filter(enacted__isnull=False)
-        slice_dict = {}
-        for slice in slices:
-            slice_dict[slice.name] = slice
-
-        # delete keystone tenants that don't have a site record
-        tenants = self.manager.driver.shell.keystone.tenants.findall()
-        system_tenants = ['admin','service']
-        for tenant in tenants:
-            if tenant.name in system_tenants: 
-                continue
-            if tenant.name not in site_dict and tenant.name not in slice_dict:
-                try:
-                    self.manager.driver.delete_tenant(tenant.id)
-                    logger.info("deleted tenant: %s" % (tenant))
-                except:
-                    logger.log_exc("delete tenant failed: %s" % tenant)
-
-
-    def sync_users(self):
-        """
-        save all users where enacted < updated or enacted == None. Remove users that
-        no don't exist in openstack db if they have an enacted time (enacted != None).
-        """ 
-        # get all users that need to be synced (enacted < updated or enacted is None)
-        pending_users = User.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for user in pending_users:
-            try:
-                self.manager.save_user(user)
-                logger.info("saved user: %s" % (user))
-            except:
-                logger.log_exc("save user failed: %s" %user)
-
-        # get all users that where enacted != null. We can assume these users
-        # have previously been synced and need to be checed for deletion.
-        users = User.objects.filter(enacted__isnull=False)
-        user_dict = {}
-        for user in users:
-            user_dict[user.kuser_id] = user
-
-        # delete keystone users that don't have a user record
-        system_users = ['admin', 'nova', 'quantum', 'glance', 'cinder', 'swift', 'service']
-        users = self.manager.driver.shell.keystone.users.findall()
-        for user in users:
-            if user.name in system_users:
-                continue
-            if user.id not in user_dict:
-                try:
-                    #self.manager.driver.delete_user(user.id)
-                    logger.info("deleted user: %s" % user)
-                except:
-                    logger.log_exc("delete user failed: %s" % user)
-                    
-
-    def sync_user_tenant_roles(self):
-        """
-        Save all site privileges and slice memberships wheree enacted < updated or 
-        enacted == None. Remove ones that don't exist in openstack db if they have 
-        an enacted time (enacted != None).
-        """
-        # sync site privileges
-        pending_site_privileges = SitePrivilege.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for site_priv in pending_site_privileges:
-            try:
-                self.manager.save_site_privilege(site_priv)  
-                logger.info("saved site privilege: %s" % (site_priv))
-            except: logger.log_exc("save site privilege failed: %s " % site_priv)
-
-        # sync slice memberships
-        pending_slice_memberships = SliceMembership.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for slice_memb in pending_slice_memberships:
-            try:
-                self.manager.save_slice_membership(slice_memb)
-                logger.info("saved slice membership: %s" % (slice_memb))
-            except: logger.log_exc("save slice membership failed: %s" % slice_memb)
-
-        # get all site privileges and slice memberships that have been enacted 
-        user_tenant_roles = defaultdict(list)
-        for site_priv in SitePrivilege.objects.filter(enacted__isnull=False):
-            user_tenant_roles[(site_priv.user.kuser_id, site_priv.site.tenant_id)].append(site_priv.role.role)
-        for slice_memb in SliceMembership.objects.filter(enacted__isnull=False):
-            user_tenant_roles[(slice_memb.user.kuser_id, slice_memb.slice.tenant_id)].append(slice_memb.role.role)  
- 
-        # Some user tenant role aren't stored in planetstack but they must be preserved. 
-        # Role that fall in this category are
-        # 1. Never remove a user's role that their home site
-        # 2. Never remove a user's role at a slice they've created.
-        # Keep track of all roles that must be preserved.     
-        users = User.objects.all()
-        preserved_roles = {}
-        for user in users:
-            tenant_ids = [s['tenant_id'] for s in user.slices.values()]
-            tenant_ids.append(user.site.tenant_id) 
-            preserved_roles[user.kuser_id] = tenant_ids
-
- 
-        # begin removing user tenant roles from keystone. This is stored in the 
-        # Metadata table.
-        for metadata in self.manager.driver.shell.keystone_db.get_metadata():
-            # skip admin roles
-            if metadata.user_id == self.manager.driver.admin_user.id:
-                continue
-            # skip preserved tenant ids
-            if metadata.user_id in preserved_roles and \
-               metadata.tenant_id in preserved_roles[metadata.user_id]: 
-                continue           
-            # get roles for user at this tenant
-            user_tenant_role_ids = user_tenant_roles.get((metadata.user_id, metadata.tenant_id), [])
-
-            if user_tenant_role_ids:
-                # The user has roles at the tenant. Check if roles need to 
-                # be updated.
-                user_keystone_role_ids = metadata.data.get('roles', [])
-                for role_id in user_keystone_role_ids:
-                    if role_id not in user_tenant_role_ids: 
-                        user_keystone_role_ids.pop(user_keystone_role_ids.index(role_id))
-            else:
-                # The user has no roles at this tenant. 
-                metadata.data['roles'] = [] 
-            #session.add(metadata)
-            logger.info("pruning metadata for %s at %s" % (metadata.user_id, metadata.tenant_id))
- 
-    def sync_slivers(self):
-        """
-        save all slivers where enacted < updated or enacted == None. Remove slivers that
-        no don't exist in openstack db if they have an enacted time (enacted != None).
-        """
-        # get all users that need to be synced (enacted < updated or enacted is None)
-        pending_slivers = Sliver.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for sliver in pending_slivers:
-            if sliver.creator: 
-                try: 
-                    # update manager context
-                    self.manager.init_caller(sliver.creator, sliver.slice.name)
-                    self.manager.save_sliver(sliver)
-                    logger.info("saved sliver: %s" % (sliver))
-                except:
-                    logger.log_exc("save sliver failed: %s" % sliver) 
-
-        # get all slivers where enacted != null. We can assume these users
-        # have previously been synced and need to be checed for deletion.
-        slivers = Sliver.objects.filter(enacted__isnull=False)
-        sliver_dict = {}
-        for sliver in slivers:
-            sliver_dict[sliver.instance_id] = sliver
-
-        # delete sliver that don't have a sliver record
-        ctx = self.manager.driver.shell.nova_db.ctx
-        instances = self.manager.driver.shell.nova_db.instance_get_all(ctx)
-        for instance in instances:
-            if instance.uuid not in sliver_dict:
-                try:
-                    # lookup tenant and update context
-                    try:
-                        tenant = self.manager.driver.shell.keystone.tenants.find(id=instance.project_id)
-                        tenant_name = tenant.name
-                    except:
-                        tenant_name = None
-                        logger.info("exception while retrieving tenant %s. Deleting instance using root tenant." % instance.project_id)
-                    self.manager.init_admin(tenant=tenant_name)
-                    self.manager.driver.destroy_instance(instance.uuid)
-                    logger.info("destroyed sliver: %s" % (instance.uuid))
-                except:
-                    logger.log_exc("destroy sliver failed: %s" % instance) 
-                
-
-    def sync_sliver_ips(self):
-        # fill in null ip addresses
-        slivers = Sliver.objects.filter(ip=None)
-        for sliver in slivers:
-            # update connection
-            self.manager.init_admin(tenant=sliver.slice.name)
-            servers = self.manager.driver.shell.nova.servers.findall(id=sliver.instance_id)
-            if not servers:
-                continue
-            server = servers[0]
-            ips = server.addresses.get(sliver.slice.name, [])
-            if not ips:
-                continue
-            sliver.ip = ips[0]['addr']
-            sliver.save()
-            logger.info("saved sliver ip: %s %s" % (sliver, ips[0]))
-
-    def sync_external_routes(self):
-        routes = self.manager.driver.get_external_routes() 
-        subnets = self.manager.driver.shell.quantum.list_subnets()['subnets']
-        for subnet in subnets:
-            try:
-                self.manager.driver.add_external_route(subnet, routes)
-            except:
-                logger.log_exc("failed to add external route for subnet %s" % subnet)
-
-    def sync_network_slivers(self):
-        networkSlivers = NetworkSliver.objects.all()
-        networkSlivers_by_id = {}
-        networkSlivers_by_port = {}
-        for networkSliver in networkSlivers:
-            networkSlivers_by_id[networkSliver.id] = networkSliver
-            networkSlivers_by_port[networkSliver.port_id] = networkSliver
-
-        networks = Network.objects.all()
-        networks_by_id = {}
-        for network in networks:
-            networks_by_id[network.network_id] = network
-
-        slivers = Sliver.objects.all()
-        slivers_by_instance_id = {}
-        for sliver in slivers:
-            slivers_by_instance_id[sliver.instance_id] = sliver
-
-        ports = self.manager.driver.shell.quantum.list_ports()["ports"]
-        for port in ports:
-            if port["id"] in networkSlivers_by_port:
-                # we already have it
-                print "already accounted for port", port["id"]
-                continue
-
-            if port["device_owner"] != "compute:nova":
-                # we only want the ports that connect to instances
-                continue
-
-            network = networks_by_id.get(port['network_id'], None)
-            if not network:
-                #print "no network for port", port["id"], "network", port["network_id"]
-                continue
-
-            sliver = slivers_by_instance_id.get(port['device_id'], None)
-            if not sliver:
-                print "no sliver for port", port["id"], "device_id", port['device_id']
-                continue
-
-            if network.template.sharedNetworkId is not None:
-                # If it's a shared network template, then more than one network
-                # object maps to the quantum network. We have to do a whole bunch
-                # of extra work to find the right one.
-                networks = network.template.network_set.all()
-                network = None
-                for candidate_network in networks:
-                    if (candidate_network.owner == sliver.slice):
-                        print "found network", candidate_network
-                        network = candidate_network
-
-                if not network:
-                    print "failed to find the correct network for a shared template for port", port["id"], "network", port["network_id"]
-                    continue
-
-            if not port["fixed_ips"]:
-                print "port", port["id"], "has no fixed_ips"
-                continue
-
-#            print "XXX", port
-
-            ns = NetworkSliver(network=network,
-                               sliver=sliver,
-                               ip=port["fixed_ips"][0]["ip_address"],
-                               port_id=port["id"])
-            ns.save()
-
-    def sync_networks(self):
-        """
-        save all networks where enacted < updated or enacted == None. Remove networks that
-        no don't exist in openstack db if they have an enacted time (enacted != None).
-        """
-        # get all users that need to be synced (enacted < updated or enacted is None)
-        pending_networks = Network.objects.filter(Q(enacted__lt=F('updated')) | Q(enacted=None))
-        for network in pending_networks:
-            if network.owner and network.owner.creator:
-                try:
-                    # update manager context
-                    self.manager.init_caller(network.owner.creator, network.owner.name)
-                    self.manager.save_network(network)
-                    logger.info("saved network: %s" % (network))
-                except:
-                    logger.log_exc("save network failed: %s" % network)
-
-        # get all networks where enacted != null. We can assume these users
-        # have previously been synced and need to be checed for deletion.
-        networks = Network.objects.filter(enacted__isnull=False)
-        network_dict = {}
-        for network in networks:
-            network_dict[network.network_id] = network
-
-        # TODO: delete Network objects if quantum network doesn't exist
-        #       (need to write self.manager.driver.shell.quantum_db)
-