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import re
from datetime import date, timedelta
from typing import Dict, List
import urlman
from asgiref.sync import sync_to_async
from django.db import models
from django.utils import timezone
from django.utils.safestring import mark_safe
from core.html import strip_html
from core.models import Config
from stator.models import State, StateField, StateGraph, StatorModel
class HashtagStates(StateGraph):
outdated = State(try_interval=300, force_initial=True)
updated = State(try_interval=3600, attempt_immediately=False)
outdated.transitions_to(updated)
updated.transitions_to(outdated)
@classmethod
async def handle_outdated(cls, instance: "Hashtag"):
"""
Computes the stats and other things for a Hashtag
"""
from .post import Post
posts_query = Post.objects.local_public().tagged_with(instance)
total = await posts_query.acount()
today = timezone.now().date()
# TODO: single query
total_today = await posts_query.filter(
created__gte=today,
created__lte=today + timedelta(days=1),
).acount()
total_month = await posts_query.filter(
created__year=today.year,
created__month=today.month,
).acount()
total_year = await posts_query.filter(
created__year=today.year,
).acount()
if total:
if not instance.stats:
instance.stats = {}
instance.stats.update(
{
"total": total,
today.isoformat(): total_today,
today.strftime("%Y-%m"): total_month,
today.strftime("%Y"): total_year,
}
)
instance.stats_updated = timezone.now()
await sync_to_async(instance.save)()
return cls.updated
@classmethod
async def handle_updated(cls, instance: "Hashtag"):
if instance.state_age > Config.system.hashtag_stats_max_age:
return cls.outdated
class HashtagQuerySet(models.QuerySet):
def public(self):
public_q = models.Q(public=True)
if Config.system.hashtag_unreviewed_are_public:
public_q |= models.Q(public__isnull=True)
return self.filter(public_q)
def hashtag_or_alias(self, hashtag: str):
return self.filter(
models.Q(hashtag=hashtag) | models.Q(aliases__contains=hashtag)
)
class HashtagManager(models.Manager):
def get_queryset(self):
return HashtagQuerySet(self.model, using=self._db)
def public(self):
return self.get_queryset().public()
def hashtag_or_alias(self, hashtag: str):
return self.get_queryset().hashtag_or_alias(hashtag)
class Hashtag(StatorModel):
# Normalized hashtag without the '#'
hashtag = models.SlugField(primary_key=True, max_length=100)
# Friendly display override
name_override = models.CharField(max_length=100, null=True, blank=True)
# Should this be shown in the public UI?
public = models.BooleanField(null=True)
# State of this Hashtag
state = StateField(HashtagStates)
# Metrics for this Hashtag
stats = models.JSONField(null=True, blank=True)
# Timestamp of last time the stats were updated
stats_updated = models.DateTimeField(null=True, blank=True)
# List of other hashtags that are considered similar
aliases = models.JSONField(null=True, blank=True)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
objects = HashtagManager()
class urls(urlman.Urls):
root = "/admin/hashtags/"
create = "/admin/hashtags/create/"
edit = "/admin/hashtags/{self.hashtag}/"
delete = "{edit}delete/"
timeline = "/tags/{self.hashtag}/"
hashtag_regex = re.compile(r"\B#([a-zA-Z0-9(_)]+\b)(?!;)")
def save(self, *args, **kwargs):
self.hashtag = self.hashtag.lstrip("#")
if self.name_override:
self.name_override = self.name_override.lstrip("#")
return super().save(*args, **kwargs)
@property
def display_name(self):
return self.name_override or self.hashtag
def __str__(self):
return self.display_name
def usage_months(self, num: int = 12) -> Dict[date, int]:
"""
Return the most recent num months of stats
"""
if not self.stats:
return {}
results = {}
for key, val in self.stats.items():
parts = key.split("-")
if len(parts) == 2:
year = int(parts[0])
month = int(parts[1])
results[date(year, month, 1)] = val
return dict(sorted(results.items(), reverse=True)[:num])
def usage_days(self, num: int = 7) -> Dict[date, int]:
"""
Return the most recent num days of stats
"""
if not self.stats:
return {}
results = {}
for key, val in self.stats.items():
parts = key.split("-")
if len(parts) == 3:
year = int(parts[0])
month = int(parts[1])
day = int(parts[2])
results[date(year, month, day)] = val
return dict(sorted(results.items(), reverse=True)[:num])
@classmethod
def hashtags_from_content(cls, content) -> List[str]:
"""
Return a parsed and sanitized of hashtags found in content without
leading '#'.
"""
hashtag_hits = cls.hashtag_regex.findall(strip_html(content))
hashtags = sorted({tag.lower() for tag in hashtag_hits})
return list(hashtags)
@classmethod
def linkify_hashtags(cls, content) -> str:
def replacer(match):
hashtag = match.group(1)
return f'<a class="hashtag" href="/tags/{hashtag.lower()}/">#{hashtag}</a>'
return mark_safe(Hashtag.hashtag_regex.sub(replacer, content))
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