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from asgiref.sync import sync_to_async
from django.db import models
from activities.models.timeline_event import TimelineEvent
from core.ld import canonicalise
from stator.models import State, StateField, StateGraph, StatorModel
class FanOutStates(StateGraph):
new = State(try_interval=300)
sent = State()
new.transitions_to(sent)
@classmethod
async def handle_new(cls, instance: "FanOut"):
"""
Sends the fan-out to the right inbox.
"""
fan_out = await instance.afetch_full()
# Handle Posts
if fan_out.type == FanOut.Types.post:
post = await fan_out.subject_post.afetch_full()
if fan_out.identity.local:
# Make a timeline event directly
# If it's a reply, we only add it if we follow at least one
# of the people mentioned.
add = True
mentioned = {identity.id for identity in post.mentions.all()}
if post.in_reply_to:
add = False
async for follow in fan_out.identity.outbound_follows.all():
if follow.target_id in mentioned:
add = True
break
if add:
await sync_to_async(TimelineEvent.add_post)(
identity=fan_out.identity,
post=post,
)
# We might have been mentioned
if fan_out.identity.id in mentioned:
await sync_to_async(TimelineEvent.add_mentioned)(
identity=fan_out.identity,
post=post,
)
else:
# Sign it and send it
await post.author.signed_request(
method="post",
uri=fan_out.identity.inbox_uri,
body=canonicalise(post.to_create_ap()),
)
# Handle deleting posts
elif fan_out.type == FanOut.Types.post_deleted:
post = await fan_out.subject_post.afetch_full()
if fan_out.identity.local:
# Remove all timeline events mentioning it
await TimelineEvent.objects.filter(
identity=fan_out.identity,
subject_post=post,
).adelete()
else:
# Send it to the remote inbox
await post.author.signed_request(
method="post",
uri=fan_out.identity.inbox_uri,
body=canonicalise(post.to_delete_ap()),
)
# Handle boosts/likes
elif fan_out.type == FanOut.Types.interaction:
interaction = await fan_out.subject_post_interaction.afetch_full()
if fan_out.identity.local:
# Make a timeline event directly
await sync_to_async(TimelineEvent.add_post_interaction)(
identity=fan_out.identity,
interaction=interaction,
)
else:
# Send it to the remote inbox
await interaction.identity.signed_request(
method="post",
uri=fan_out.identity.inbox_uri,
body=canonicalise(interaction.to_ap()),
)
# Handle undoing boosts/likes
elif fan_out.type == FanOut.Types.undo_interaction:
interaction = await fan_out.subject_post_interaction.afetch_full()
if fan_out.identity.local:
# Delete any local timeline events
await sync_to_async(TimelineEvent.delete_post_interaction)(
identity=fan_out.identity,
interaction=interaction,
)
else:
# Send an undo to the remote inbox
await interaction.identity.signed_request(
method="post",
uri=fan_out.identity.inbox_uri,
body=canonicalise(interaction.to_undo_ap()),
)
else:
raise ValueError(f"Cannot fan out with type {fan_out.type}")
return cls.sent
class FanOut(StatorModel):
"""
An activity that needs to get to an inbox somewhere.
"""
class Types(models.TextChoices):
post = "post"
post_edited = "post_edited"
post_deleted = "post_deleted"
interaction = "interaction"
undo_interaction = "undo_interaction"
state = StateField(FanOutStates)
# The user this event is targeted at
identity = models.ForeignKey(
"users.Identity",
on_delete=models.CASCADE,
related_name="fan_outs",
)
# What type of activity it is
type = models.CharField(max_length=100, choices=Types.choices)
# Links to the appropriate objects
subject_post = models.ForeignKey(
"activities.Post",
on_delete=models.CASCADE,
blank=True,
null=True,
related_name="fan_outs",
)
subject_post_interaction = models.ForeignKey(
"activities.PostInteraction",
on_delete=models.CASCADE,
blank=True,
null=True,
related_name="fan_outs",
)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
### Async helpers ###
async def afetch_full(self):
"""
Returns a version of the object with all relations pre-loaded
"""
return await FanOut.objects.select_related(
"identity",
"subject_post",
"subject_post_interaction",
).aget(pk=self.pk)
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