[GitHub] griff122 opened a new pull request #4423: [AIRFLOW-3618] - Fix models.connection.Connection get_hook function

[GitBox <gi...@apache.org>]

griff122 opened a new pull request #4423: [AIRFLOW-3618] - Fix models.connection.Connection get_hook function
URL: https://github.com/apache/incubator-airflow/pull/4423
 
 
   Make sure you have checked _all_ steps below.
   
   ### Jira
   
   - [x] https://issues.apache.org/jira/browse/AIRFLOW-3618
   
   ### Description
   
   - [x] The airflow.models.connection.Connection class function get_hook did not work as expected. The `conn_type` was not guaranteed to be lower case, and the get_hook function expected all lowercase type names. By updating the code so that the conditionals used `self.conn_type.lower()` instead of just `self.conn_type`, we can now make sure that the conditionals match the expected. 
   
   For example:
   ```
   >>> import airflow
   >>> from airflow.hooks.base_hook import BaseHook
   >>> airflow.__version__
   '1.10.1'
   >>> conn = BaseHook.get_connection('test_local_mysql')
   [2019-01-02 11:36:15,530] {base_hook.py:83} INFO - Using connection to: localhost
   >>> conn.conn_type
   'MySQL'
   >>> type(conn.get_hook())
   <class 'NoneType'>
   >>> conn.conn_type = conn.conn_type.lower()
   >>> conn.conn_type
   'mysql'
   >>> type(conn.get_hook())
   <class 'airflow.hooks.mysql_hook.MySqlHook'>
   ```
   
   ### Tests
   
   - [x] Does not need tests as it is updating existing functionality which should already have test associated.
   
   ### Commits
   
   - [x] My commits all reference Jira issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "[How to write a good git commit message](http://chris.beams.io/posts/git-commit/)":
     1. Subject is separated from body by a blank line
     1. Subject is limited to 50 characters (not including Jira issue reference)
     1. Subject does not end with a period
     1. Subject uses the imperative mood ("add", not "adding")
     1. Body wraps at 72 characters
     1. Body explains "what" and "why", not "how"
   
   ### Documentation
   
   - [x] No new documentation is needed as the change is a bug fix which does not change the expected functionality of the function `Connection.get_hook`.
   
   ### Code Quality
   
   - [x] Passes `flake8`

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