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from asgiref.sync import sync_to_async
from django.db import models
from stator.models import State, StateField, StateGraph, StatorModel
class InboxMessageStates(StateGraph):
received = State(try_interval=300)
processed = State()
received.transitions_to(processed)
@classmethod
async def handle_received(cls, instance: "InboxMessage"):
from activities.models import Post, PostInteraction
from users.models import Follow
match instance.message_type:
case "follow":
await sync_to_async(Follow.handle_request_ap)(instance.message)
case "announce":
await sync_to_async(PostInteraction.handle_ap)(instance.message)
case "like":
await sync_to_async(PostInteraction.handle_ap)(instance.message)
case "create":
match instance.message_object_type:
case "note":
await sync_to_async(Post.handle_create_ap)(instance.message)
case unknown:
raise ValueError(
f"Cannot handle activity of type create.{unknown}"
)
case "accept":
match instance.message_object_type:
case "follow":
await sync_to_async(Follow.handle_accept_ap)(instance.message)
case unknown:
raise ValueError(
f"Cannot handle activity of type accept.{unknown}"
)
case "undo":
match instance.message_object_type:
case "follow":
await sync_to_async(Follow.handle_undo_ap)(instance.message)
case "like":
await sync_to_async(PostInteraction.handle_undo_ap)(
instance.message
)
case "announce":
await sync_to_async(PostInteraction.handle_undo_ap)(
instance.message
)
case unknown:
raise ValueError(
f"Cannot handle activity of type undo.{unknown}"
)
case "delete":
match instance.message_object_type:
case "tombstone":
await sync_to_async(Post.handle_delete_ap)(instance.message)
case unknown:
raise ValueError(
f"Cannot handle activity of type delete.{unknown}"
)
case unknown:
raise ValueError(f"Cannot handle activity of type {unknown}")
return cls.processed
class InboxMessage(StatorModel):
"""
an incoming inbox message that needs processing.
Yes, this is kind of its own message queue built on the state graph system.
It's fine. It'll scale up to a decent point.
"""
message = models.JSONField()
state = StateField(InboxMessageStates)
@property
def message_type(self):
return self.message["type"].lower()
@property
def message_object_type(self):
return self.message["object"]["type"].lower()
@property
def message_actor(self):
return self.message.get("actor")
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