bkyryliuk commented on a change in pull request #10605:
URL:
https://github.com/apache/incubator-superset/pull/10605#discussion_r476651301
##########
File path: superset/models/alerts.py
##########
@@ -100,3 +119,187 @@ class AlertLog(Model):
@property
def duration(self) -> int:
return (self.dttm_end - self.dttm_start).total_seconds()
+
+
+class Observer(Model):
+
+ __tablename__ = "alert_observers"
+
+ id = Column(Integer, primary_key=True)
+ name = Column(String(150), nullable=False)
+ observer_type = Column(Enum(AlertObserverType))
+ validation_type = Column(Enum(AlertValidationType))
+
+ @declared_attr
+ def alert_id(self) -> int:
+ return Column(Integer, ForeignKey("alerts.id"), nullable=False)
+
+ @declared_attr
+ def alert(self) -> RelationshipProperty:
+ return relationship(
+ "Alert",
+ foreign_keys=[self.alert_id],
+ backref=backref("alert_observers", cascade="all, delete-orphan"),
+ )
+
+ @declared_attr
+ def database_id(self) -> int:
+ return Column(Integer, ForeignKey("dbs.id"), nullable=False)
+
+ @declared_attr
+ def database(self) -> RelationshipProperty:
+ return relationship(
+ "Database",
+ foreign_keys=[self.database_id],
+ backref=backref("alert_observers", cascade="all, delete-orphan"),
+ )
+
+ __mapper_args__ = {
+ "polymorphic_identity": "base_observer",
+ "polymorphic_on": observer_type,
+ }
+
+
+class SQLObserver(Observer):
+
+ __tablename__ = "alert_observers"
+
+ sql = Column(Text, nullable=False)
+
+ def query(self) -> None:
+ parsed_query = ParsedQuery(self.sql)
+ sql = parsed_query.stripped()
+ df = self.database.get_df(sql)
+
+ self.observations.append( # pylint: disable=no-member
+ Observation(dttm_ts=datetime.utcnow(), value=df.to_json())
+ )
+
+ db.session.commit()
+
+ def get_observations(self, observation_num: int) -> List[Any]:
+ return (
+ db.session.query(Observation)
+ .filter_by(observer_id=self.id)
+ .order_by(Observation.dttm_ts.desc())
+ .limit(observation_num)
+ )
+
+ __mapper_args__ = {"polymorphic_identity": AlertObserverType.sql}
+
+
+class Observation(Model): # pylint: disable=too-few-public-methods
+
+ __tablename__ = "alert_observations"
+
+ id = Column(Integer, primary_key=True)
+ dttm_ts = Column(DateTime, default=datetime.utcnow)
+ observer_id = Column(Integer, ForeignKey("alert_observers.id"),
nullable=False)
+ observer = relationship(
+ "Observer",
+ foreign_keys=[observer_id],
+ backref=backref("observations", cascade="all, delete-orphan"),
+ )
+ value = Column(Text)
+
+
+class Validator(Model):
+
+ __tablename__ = "alert_validators"
Review comment:
no need for the validator table, probably move this class closer to the
alerts logic
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