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from typing import Optional
from django.db import models
from stator.models import State, StateField, StateGraph, StatorModel
class FollowStates(StateGraph):
unrequested = State(try_interval=30)
requested = State(try_interval=24 * 60 * 60)
accepted = State()
unrequested.transitions_to(requested)
requested.transitions_to(accepted)
@classmethod
async def handle_unrequested(cls, instance: "Follow"):
print("Would have tried to follow on", instance)
@classmethod
async def handle_requested(cls, instance: "Follow"):
print("Would have tried to requested on", instance)
class Follow(StatorModel):
"""
When one user (the source) follows other (the target)
"""
source = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="outbound_follows",
)
target = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="inbound_follows",
)
uri = models.CharField(blank=True, null=True, max_length=500)
note = models.TextField(blank=True, null=True)
state = StateField(FollowStates)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
class Meta:
unique_together = [("source", "target")]
@classmethod
def maybe_get(cls, source, target) -> Optional["Follow"]:
"""
Returns a follow if it exists between source and target
"""
try:
return Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
return None
@classmethod
def create_local(cls, source, target):
"""
Creates a Follow from a local Identity to the target
(which can be local or remote).
"""
if not source.local:
raise ValueError("You cannot initiate follows from a remote Identity")
try:
follow = Follow.objects.get(source=source, target=target)
except Follow.DoesNotExist:
follow = Follow.objects.create(source=source, target=target, uri="")
follow.uri = source.actor_uri + f"follow/{follow.pk}/"
# TODO: Local follow approvals
if target.local:
follow.state = FollowStates.accepted
follow.save()
return follow
@classmethod
def remote_created(cls, source, target, uri):
follow = cls.maybe_get(source=source, target=target)
if follow is None:
follow = Follow.objects.create(source=source, target=target, uri=uri)
if follow.state == FollowStates.fresh:
follow.transition_perform(FollowStates.requested)
@classmethod
def remote_accepted(cls, source, target):
follow = cls.maybe_get(source=source, target=target)
if follow and follow.state == FollowStates.requested:
follow.transition_perform(FollowStates.accepted)
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