khyurri commented on a change in pull request #10254:
URL: https://github.com/apache/airflow/pull/10254#discussion_r499124977
##########
File path: airflow/utils/db.py
##########
@@ -606,6 +606,59 @@ def check_migrations(timeout):
log.info('Waiting for migrations... %s second(s)', ticker)
+def check_conn_id_duplicates(session=None):
+ """
+ Check unique conn_id in connection table
+ @param session: session of the sqlalchemy
+ @return: str
+ """
+ dups = session.query(Connection, func.count(Connection.conn_id)) \
+ .group_by(Connection.conn_id) \
+ .having(func.count(Connection.conn_id) > 1).all()
+ if dups:
+ return f'Seems you have non unique conn_id in connection table.\n' \
+ f'You have to manage those duplicate connections ' \
+ f'before upgrading the database.\n' \
+ f'Duplicated conn_id: {[dup[0] for dup in dups]}'
+ return ''
+
+
+def check_conn_type_null(session=None):
+ """
+ Check nullable conn_type column in connection table
+ @param session: session of the sqlalchemy
+ @return: str
+ """
+ n_nulls = session.query(Connection)\
+ .filter(Connection.conn_type.is_(None)).all()
+ if n_nulls:
+ return f'The conn_type column in the connection ' \
+ f'table must contain content.\n' \
+ f'Make sure you don\'t have null ' \
+ f'in the conn_type column.\n' \
+ f'Null conn_type conn_id: {list(n_nulls)}'
+ return ''
+
+
+@provide_session
+def auto_migrations_available(session=None):
+ """
+ @session: session of the sqlalchemy
+ @return: list[str]
+ """
+ errors_ = []
+ try:
+ for check_fn in (check_conn_id_duplicates, check_conn_type_null):
+ err = check_fn(session)
+ if err:
+ errors_.append(err)
+ except (exc.OperationalError, exc.ProgrammingError):
+ # fallback if tables hasn't been created yet
+ pass
Review comment:
> I would expect that if Connection table does not exits, other tables
won't exist either.
Agree.
If `exc.OperationalError, exc.ProgrammingError`, it means, that database in
unexpected state (eg empty). No reason to continue check migration safety.
Other way:
The script can except `exc.OperationalError, exc.ProgrammingError` on every
item in loop:
```python
for check_fn in (check_conn_id_duplicates, check_conn_type_null):
try:
err = check_fn(session)
if err:
errors_.append(err)
except (exc.OperationalError, exc.ProgrammingError):
# fallback if table hasn't been created yet
pass
```
What do you think about it?
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