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models.py
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models.py
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import json
from datetime import datetime, time
from django.db import models
from django.db.models import Q
from django.db.models.signals import post_save
from django.dispatch import receiver
from django.utils import timezone
from multiselectfield import MultiSelectField
from aas.alert.models import Alert
from aas.auth.models import User
from .utils import AttrGetter, NestedAttrGetter
class TimeSlot(models.Model):
class Meta:
constraints = [
models.UniqueConstraint(
fields=["name", "user"], name="timeslot_unique_name_per_user"
),
]
ordering = ["name"]
user = models.ForeignKey(
to=User, on_delete=models.CASCADE, related_name="time_slots",
)
name = models.CharField(max_length=40)
def timestamp_is_within_time_intervals(self, timestamp: datetime):
for time_interval in self.time_intervals.all():
if time_interval.timestamp_is_within(timestamp):
return True
return False
def __str__(self):
return self.name
# Create default immediate TimeSlot when a user is created
@staticmethod
@receiver(post_save, sender=User)
def create_default_time_slot(sender, instance, created, raw, *args, **kwargs):
if raw or not created:
return
time_slot = TimeSlot.objects.create(user=instance, name="Immediately")
time_interval_start, time_interval_end = (
TimeInterval.DAY_START,
TimeInterval.DAY_END,
)
for day, _day_name in TimeInterval.DAY_CHOICES:
TimeInterval.objects.create(
time_slot=time_slot,
day=day,
start=time_interval_start,
end=time_interval_end,
)
class TimeInterval(models.Model):
DAY_START = time.min
DAY_END = time.max
MONDAY = "MO"
TUESDAY = "TU"
WEDNESDAY = "WE"
THURSDAY = "TH"
FRIDAY = "FR"
SATURDAY = "SA"
SUNDAY = "SU"
DAY_CHOICES = (
(MONDAY, "Monday"),
(TUESDAY, "Tuesday"),
(WEDNESDAY, "Wednesday"),
(THURSDAY, "Thursday"),
(FRIDAY, "Friday"),
(SATURDAY, "Saturday"),
(SUNDAY, "Sunday"),
)
# Map day name to ISO index, e.g. 'MO': 1
DAY_NAME_TO_INDEX = {day: i + 1 for i, (day, _) in enumerate(DAY_CHOICES)}
time_slot = models.ForeignKey(
to=TimeSlot, on_delete=models.CASCADE, related_name="time_intervals",
)
day = models.CharField(max_length=2, choices=DAY_CHOICES)
start = models.TimeField(help_text="Local time.")
end = models.TimeField(help_text="Local time.")
@property
def isoweekday(self):
return self.DAY_NAME_TO_INDEX[self.day]
def timestamp_is_within(self, timestamp: datetime):
# FIXME: Might affect performance negatively if calling this method frequently
timestamp = timestamp.astimezone(timezone.get_current_timezone())
return (
timestamp.isoweekday() == self.isoweekday
and self.start <= timestamp.time() <= self.end
)
""" needed?
def __eq__(self, other):
if type(other) is not TimeInterval:
return False
if super().__eq__(other):
return True
return (
self.day == other.day
and self.start == other.start
and self.end == other.end
)
"""
def __str__(self):
return f"{self.start}-{self.end} on {self.get_day_display()}s"
class Filter(models.Model):
class Meta:
constraints = [
models.UniqueConstraint(
fields=["name", "user"], name="filter_unique_name_per_user"
),
]
FILTER_STRING_FIELDS = {
"sourceIds": AttrGetter("source"),
"objectTypeIds": NestedAttrGetter("object.type"),
"parentObjectIds": AttrGetter("parent_object"),
"problemTypeIds": AttrGetter("problem_type"),
}
user = models.ForeignKey(to=User, on_delete=models.CASCADE, related_name="filters",)
name = models.CharField(max_length=40)
filter_string = models.TextField()
@property
def filter_json(self):
return json.loads(self.filter_string)
@property
def filtered_alerts(self):
return Alert.prefetch_related_fields(
Alert.objects.filter(self.get_alert_query())
)
def get_alert_query(self):
json_dict = self.filter_json
alert_query = Q()
for filter_field_name, attr_getter in self.FILTER_STRING_FIELDS.items():
filter_field_value_list = json_dict[filter_field_name]
if filter_field_value_list:
alert_arg = {f"{attr_getter.query}__in": filter_field_value_list}
alert_query &= Q(**alert_arg)
return alert_query
def alert_fits(self, alert: Alert):
json_dict = self.filter_json
for filter_field_name, attr_getter in self.FILTER_STRING_FIELDS.items():
filter_field_value_set = set(json_dict[filter_field_name])
if filter_field_value_set:
alert_attr = attr_getter(alert)
if alert_attr.pk not in filter_field_value_set:
return False
return True
def __str__(self):
return f"{self.name} [{self.filter_string}]"
class NotificationProfile(models.Model):
user = models.ForeignKey(
to=User, on_delete=models.CASCADE, related_name="notification_profiles",
)
# TODO: add constraint that user must be the same
time_slot = models.OneToOneField(
to=TimeSlot,
on_delete=models.CASCADE,
primary_key=True,
related_name="notification_profile",
)
filters = models.ManyToManyField(to=Filter, related_name="notification_profiles",)
EMAIL = "EM"
SMS = "SM"
SLACK = "SL"
MEDIA_CHOICES = (
(EMAIL, "Email"),
(SMS, "SMS"),
(SLACK, "Slack"),
)
# TODO: support for multiple email addresses / phone numbers / Slack users
media = MultiSelectField(choices=MEDIA_CHOICES, min_choices=1, default=EMAIL)
active = models.BooleanField(default=True)
@property
def filtered_alerts(self):
alert_query = Q()
for filter_ in self.filters.all():
alert_query |= filter_.get_alert_query()
return Alert.prefetch_related_fields(Alert.objects.filter(alert_query))
def alert_fits(self, alert: Alert):
if not self.active:
return False
return self.time_slot.timestamp_is_within_time_intervals(
alert.timestamp
) and any(f.alert_fits(alert) for f in self.filters.all())
def __str__(self):
return f"{self.time_slot}: {', '.join(str(f) for f in self.filters.all())}"