Metadata-Version: 2.1
Name: luigi-soft-failures
Version: 0.1.1
Summary: Allow Luigi tasks to fail softly, without cancelling downstream tasks.
Home-page: https://github.com/maxhollmann/luigi_soft_failures
Author: Max Hollmann
Author-email: maxhollmann@gmail.com
License: MIT
Description: 
        Provides a decorator for Luigi tasks that allows them to fail *softly*. Tasks that fail softly are seen by Luigi as complete, and thus don't prevent dependent tasks from running. The dependent task can check if it's dependencies actually ran successfully or failed softly.
        
        
        # Installation
        
            pip install luigi_soft_failures
        
        
        # Usage
        
        ```python
        from luigi_soft_failures import softly_failing
        ```
        
        Use as class decorator:
        
        ```python
        @softly_failing(catch_all=True, propagate=True)
        class SomeTask(luigi.Task):
            ...
        ```
        
        Or on demand in the requiring task:
        
        ```python
        def requires(self):
            return softly_failing(catch_all=True)(SomeTask)(some_param=42)
        ```
        
        The dependent task can check the status of it's dependencies using `failed_softly`:
        
        ```python
        def run(self):
            if self.requires().failed_softly():
                ...
        ```
        
        For a complete example see [as_decorator.py](https://github.com/maxhollmann/luigi_soft_failures/blob/master/examples/as_decorator.py).
        
        
        ## API
        
        `softly_failing` accepts the following parameters:
        
        * `catch_all` (`bool`, default `False`):
        
          When `True`, any exception thrown in the task's `run` method will lead to a soft failure. Otherwise, soft failures can be generated manually by calling `self.fail_softly('Some error message')` from the task's `run` method and exiting the method without exception.
        
        * `propagate` (`bool`, default `False`):
        
          When `True`, the task fails softly if any of it's dependencies failed softly, and `run` is never executed. Otherwise, `run` is executed as if the dependencies ran successfully.
        
        * `output_dir` (`str`, default `None`): Described [below](#storage-of-soft-failure-reports).
        
        
        ## Storage of soft failure reports
        
        Whan the wrapped task fails softly, it creates a report with the failure message or exception traceback to indicate this. These reports are stored in a directory specified in one of the following ways (in this order of precedence):
        
        * `output_dir` parameter passed to `softly_failing`
        * Specified in `luigi.cfg`:
        
              [luigi_soft_failures.Config]
              output_dir=/some/path
        
        * Environment variable `LUIGI_SOFT_FAILURES_OUTPUT_DIR`
        * Default `./soft_failures/`
        
        
        # Limitations
        
        * Soft failure status is stored using a `LocalTarget`, so a local storage that all workers have access to is required.
        * In the Luigi visualizer, softly failed tasks are shown as complete.
        
        Pull requests to address these are very welcome!
        
Platform: UNKNOWN
Classifier: License :: OSI Approved :: MIT License
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3 :: Only
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Requires-Python: >=3.6.0
Description-Content-Type: text/markdown
