[GitHub] potiuk opened a new pull request #4350: [AIRFLOW-3527] Cloud SQL Proxy has shorter path for UNIX socket

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potiuk opened a new pull request #4350: [AIRFLOW-3527] Cloud SQL Proxy has shorter path for UNIX socket
URL: https://github.com/apache/incubator-airflow/pull/4350
 
 
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   ### Jira
   
   - [ ] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW-3527)
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   
   There is a limitation of UNIX socket path length as described in
   http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_un.h.html#tag_13_67_04
   
   Cloud SQL Proxy uses generated path and it can get longer than the limit
   in case of POSTGRES connections especially (POSTGRES adds few characters on
   its own). The error returned by sqlproxy in this case is pretty vague
   (invalid path) - it makes it difficult to understand the problem by
   the user.
   
   This commit fixes it in two ways:
   * makes it less likely that the path length will be exceeded
   by shorter random string generated for the socket directory.
   * raises an Error in case of calculated path is too long
   ### Tests
   
   - [x] My PR adds the following unit tests:
   CloudSqlQueryValidationTest:
   * test_create_operator_with_too_long_unix_socket_path
   * test_create_operator_with_not_too_long_unix_socket_path
   
   ### 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 documentation update is needed.
   
   ### Code Quality
   - [x] Passes `flake8`
   

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