[jira] [Created] (AIRFLOW-1543) Improve logging when `fernet_key` format is incorrect

["Tiantian Gao (JIRA)" <ji...@apache.org>]

Tiantian Gao created AIRFLOW-1543:
-------------------------------------

             Summary: Improve logging when `fernet_key` format is incorrect
                 Key: AIRFLOW-1543
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1543
             Project: Apache Airflow
          Issue Type: Bug
    Affects Versions: 1.9.0
            Reporter: Tiantian Gao
            Priority: Minor


Using the default airflow.cfg, and modify "fernet_key" to some thing like "sdfsdfsfsdf", which incorrect format.

then run "airflow initdb", raise below 

{code:python}
[2017-08-29 23:01:20,197] {driver.py:120} INFO - Generating grammar tables from /usr/lib/python2.7/lib2to3/Grammar.txt
[2017-08-29 23:01:20,231] {driver.py:120} INFO - Generating grammar tables from /usr/lib/python2.7/lib2to3/PatternGrammar.txt
[2017-08-29 23:01:20,436] {__init__.py:45} INFO - Using executor SequentialExecutor
DB: sqlite:////home/ubuntu/airflow/airflow.db
[2017-08-29 23:01:20,618] {db.py:311} INFO - Creating tables
INFO  [alembic.runtime.migration] Context impl SQLiteImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
/home/ubuntu/src/incubator-airflow/.venv/local/lib/python2.7/site-packages/cffi/model.py:525: UserWarning: 'point_conversion_form_t' has no values explicitly defined; guessing that it is equivalent to 'unsigned int'
  % self._get_c_name())
Traceback (most recent call last):
  File "/home/ubuntu/src/incubator-airflow/.venv/bin/airflow", line 10, in <module>
    execfile(__file__)
  File "/home/ubuntu/src/incubator-airflow/airflow/bin/airflow", line 28, in <module>
    args.func(args)
  File "/home/ubuntu/src/incubator-airflow/airflow/bin/cli.py", line 894, in initdb
    db_utils.initdb()
  File "/home/ubuntu/src/incubator-airflow/airflow/utils/db.py", line 112, in initdb
    schema='airflow_ci'))
  File "<string>", line 4, in __init__
  File "/home/ubuntu/src/incubator-airflow/.venv/local/lib/python2.7/site-packages/sqlalchemy/orm/state.py", line 414, in _initialize_instance
    manager.dispatch.init_failure(self, args, kwargs)
  File "/home/ubuntu/src/incubator-airflow/.venv/local/lib/python2.7/site-packages/sqlalchemy/util/langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/home/ubuntu/src/incubator-airflow/.venv/local/lib/python2.7/site-packages/sqlalchemy/orm/state.py", line 411, in _initialize_instance
    return manager.original_init(*mixed[1:], **kwargs)
  File "/home/ubuntu/src/incubator-airflow/airflow/models.py", line 585, in __init__
    self.extra = extra
  File "<string>", line 1, in __set__
  File "/home/ubuntu/src/incubator-airflow/airflow/models.py", line 646, in set_extra
    fernet = get_fernet()
  File "/home/ubuntu/src/incubator-airflow/airflow/models.py", line 105, in get_fernet
    return Fernet(configuration.get('core', 'FERNET_KEY').encode('utf-8'))
  File "/home/ubuntu/src/incubator-airflow/.venv/local/lib/python2.7/site-packages/cryptography/fernet.py", line 34, in __init__
    key = base64.urlsafe_b64decode(key)
  File "/usr/lib/python2.7/base64.py", line 112, in urlsafe_b64decode
    return b64decode(s, '-_')
  File "/usr/lib/python2.7/base64.py", line 76, in b64decode
    raise TypeError(msg)
TypeError: Incorrect padding
{code}




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