[jira] [Commented] (AIRFLOW-850) Airflow should support a general purpose PythonSensor

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/AIRFLOW-850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16726472#comment-16726472 ] 

ASF GitHub Bot commented on AIRFLOW-850:
----------------------------------------

feng-tao opened a new pull request #4349: [AIRFLOW-850] Add a PythonSensor
URL: https://github.com/apache/incubator-airflow/pull/4349
 
 
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   ### Jira
   
   - [x] My PR addresses the following [Airflow Jira](https://issues.apache.org/jira/browse/AIRFLOW/) issues and references them in the PR title. For example, "\[AIRFLOW-XXX\] My Airflow PR"
     - https://issues.apache.org/jira/browse/AIRFLOW-850
     - In case you are fixing a typo in the documentation you can prepend your commit with \[AIRFLOW-XXX\], code changes always need a Jira issue.
   
   ### Description
   
   - [x] Here are some details about my PR, including screenshots of any UI changes:
   A general purpose PythonSensor which allows an arbitrary Python callable to delay Task execution until the callable returns True. This is based on a stale pr(https://github.com/apache/incubator-airflow/pull/2058)
   
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   yes
   
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   ### Documentation
   
   - [x] In case of new functionality, my PR adds documentation that describes how to use it.
     - When adding new operators/hooks/sensors, the autoclass documentation generation needs to be added.
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   ### Code Quality
   
   - [x] Passes `flake8`
   

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> Airflow should support a general purpose PythonSensor
> -----------------------------------------------------
>
>                 Key: AIRFLOW-850
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-850
>             Project: Apache Airflow
>          Issue Type: Improvement
>          Components: operators
>    Affects Versions: 1.8.0
>            Reporter: Daniel Gies
>            Assignee: Daniel Gies
>            Priority: Major
>
> Today I found myself trying to use a sensor to postpone execution until data for the current execution date appeared in a file.  It occurred to me that having a general purpose PythonSensor would allow developers to use the sensor paradigm with arbitrary code.
> We should add a PythonSensor to the core sensors module which takes a python_callable and optional args like the PythonOperator does.



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