ephraimbuddy commented on code in PR #42913: URL: https://github.com/apache/airflow/pull/42913#discussion_r1816083320
########## airflow/models/dag_version.py: ########## @@ -0,0 +1,149 @@ +# Licensed to the Apache Software Foundation (ASF) under one +# or more contributor license agreements. See the NOTICE file +# distributed with this work for additional information +# regarding copyright ownership. The ASF licenses this file +# to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance +# with the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, +# software distributed under the License is distributed on an +# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +# KIND, either express or implied. See the License for the +# specific language governing permissions and limitations +# under the License. + +from __future__ import annotations + +import logging +import random +import string +from typing import TYPE_CHECKING + +from sqlalchemy import Column, ForeignKey, Integer, select +from sqlalchemy.orm import relationship + +from airflow.models.base import Base, StringID +from airflow.utils.session import NEW_SESSION, provide_session + +if TYPE_CHECKING: + from sqlalchemy.orm import Session + + from airflow.models.dagcode import DagCode + from airflow.models.serialized_dag import SerializedDagModel + +log = logging.getLogger(__name__) + + +class DagVersion(Base): + """Model to track the versions of DAGs in the database.""" + + __tablename__ = "dag_version" + id = Column(Integer, primary_key=True) + version_number = Column(Integer) + version_name = Column(StringID()) + dag_id = Column(StringID(), ForeignKey("dag.dag_id", ondelete="CASCADE")) + dag_model = relationship("DagModel", back_populates="dag_versions") + dag_code = relationship("DagCode", back_populates="dag_version", uselist=False) + serialized_dag = relationship("SerializedDagModel", back_populates="dag_version", uselist=False) + dag_runs = relationship("DagRun", back_populates="dag_version") + task_instances = relationship("TaskInstance", back_populates="dag_version") + + def __init__( + self, + *, + dag_id: str, + version_number: int, + dag_code: DagCode, + serialized_dag: SerializedDagModel, + version_name: str | None = None, + ): + self.dag_id = dag_id + self.version_number = version_number + self.dag_code = dag_code + self.serialized_dag = serialized_dag + self.version_name = version_name + + def __repr__(self): + return f"<DagVersion {self.dag_id} - {self.version_name}>" + + @classmethod + def _generate_random_string(cls): + letters = string.ascii_letters + string.digits + return "dag-" + "".join(random.choice(letters) for i in range(10)) + + @classmethod + @provide_session + def _generate_unique_random_string(cls, session: Session = NEW_SESSION): + while True: + random_str = cls._generate_random_string() + # Check if the generated string exists + if not session.scalar(select(cls).where(cls.version_name == random_str)): + return random_str + + @classmethod + @provide_session + def write_dag( + cls, + *, + dag_id: str, + dag_code: DagCode, + serialized_dag: SerializedDagModel, + version_name: str | None = None, + session: Session = NEW_SESSION, + ): + """Write a new DagVersion into database.""" + existing_dag_version = session.scalar( + select(cls).where(cls.dag_id == dag_id).order_by(cls.version_number.desc()).limit(1) + ) + version_number = 1 + + if existing_dag_version: + version_number = existing_dag_version.version_number + 1 Review Comment: It's not just for ordering. The version number helps to track the version changes. If a version named `my_version` is added, it first gets `my_version_1`, if there's a change in the code but the version name is still not change, then the number will increment and we have `my_version_2`. So it's not just for ordering -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@airflow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
