class IContactObserver(object):
"""
Class that utilizes icontact client to sync model with icontact service
"""
def __init__(self, client=None):
"""
Initialize an instance of the CalendarObserver class.
"""
self.adapters = {}
self._client = client
def observe(self, model, adapter):
"""
Establishes a connection between the model and Google Calendar, using
adapter to transform data.
"""
self.adapters[model] = adapter
signals.post_save.connect(self.on_update, sender=model)
signals.post_delete.connect(self.on_delete, sender=model)
def on_update(self, **kwargs):
"""
Called by Django's signal mechanism when an observed model is updated.
"""
created = kwargs.get('created', False)
if created:
logging.debug("Created")
self.create(kwargs['sender'], kwargs['instance'])
return
logging.debug("Updating")
self.update(kwargs['sender'], kwargs['instance'])
def on_delete(self, **kwargs):
"""
Called by Django's signal mechanism when an observed model is deleted.
"""
self.delete(kwargs['sender'], kwargs['instance'])
def client(self):
"""
Instantiate the client class to make authenticated calls to icontact.
"""
if self._client is None:
self._client = IContactClient()
return self._client
def get_contact(self, instance):
"""
gets a contact from icontact service
"""
contact_id = IContact.objects.get_contact_id(instance)
logging.debug("contact id: {id}".format(id=contact_id))
try:
contact = self._client.get_contact(contact_id)
except IContactException:
return None
logging.debug('contact retrived')
logging.debug(contact)
return contact
def create(self, sender, instance):
"""
creates a new contact on icontact's datata base as well as a
iContact instance
"""
adapter = self.adapters[sender]
logging.debug('Adapter: {adapter}'.format(adapter=adapter))
client = self.client()
contact = adapter.get_contact_data(instance) #IcontactData instance
data = contact.get_data()
logging.debug("contact's data: %s"%data)
try:
icontact = client.create_contact(payload=data)
contact_id = icontact['contacts'][0]['contactId']
subscription = client.subscribe(contact_id)
except IContactException:
return None
IContact.objects.set_contact_id(instance, contact_id)
def update(self, sender, instance):
"""
Update or create an Icontact Contact.
By default the client subscribes to the deault list specified in
settings.py
"""
adapter = self.adapters[sender]
client = self.client()
contact = adapter.get_contact_data(instance) #IcontactData instance
data = contact.get_data()
logging.debug(data)
logging.debug(data['contact'])
try:
icontact = self.get_contact(instance)
contact_id = icontact['contact']['contactId']
client.update_contact(contact_id=contact_id, payload=data['contact'])
except IContactException:
return None
IContact.objects.set_contact_id(instance, contact_id)
def delete(self, sender, instance):
"""
Deletes iContact record from their service and from our database
"""
adapter = self.adapters[sender]
client = self.client()
contact = adapter.get_contact_data(instance) #IcontactData instance
icontact = self.get_contact(instance)
if not icontact: return None
contact_id = icontact['contact']['contactId']
try:
client.delete_contact(contact_id) #delete from icontact
except IContactException:
pass
IContact.objects.delete_contact_id(instance) #delete from database
