https://github.com/shir0kamii/pyhooks

Python hooks for methods
https://github.com/shir0kamii/pyhooks

Last synced: about 1 month ago
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Python hooks for methods

• Host: GitHub
• URL: https://github.com/shir0kamii/pyhooks
• Owner: Shir0kamii
• Created: 2016-10-01T13:15:34.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2019-10-16T19:54:51.000Z (about 5 years ago)
• Last Synced: 2024-11-11T00:42:34.580Z (about 1 month ago)
• Language: Python
• Size: 34.2 KB
• Stars: 75
• Watchers: 5
• Forks: 12
• Open Issues: 0
• Metadata Files:
  • Readme: README.rst

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README

        
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PyHooks

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PyHooks is meant to expose method hook for classes

======

Status

======

This project is maintained, feel free to open issues or pull requests.

=======

Purpose

=======

Have you ever wanted to execute code before or after a method ? PyHooks solve

this exact problem taking inspiration from marshmallow's hook system.

============

Installation

============

Like any other published python package, you can install it via `pip` : 

.. code-block:: bash

    pip install pyhooks

============

How to use ?

============

To use it, you first need to implement a hooked method. You do this by

decorating the method with `@Hook`.

For example, suppose you have a class that at some moment save your data (such

as a database). If you want to be able to plug new behavior, your code

will look like this:

.. code-block:: python 

    from pyhooks import Hook

    class DatabaseEntry(object):

        @Hook

        def save(self):

            pass # save implementation here

Thanks to the `@Hook` line, you will now be able to add functions that execute

before and after the `save` method using the decorators `@precall_register` 

and `@postcall_register`.

For instance, if you want to increment a version variable before 

saving, you could do:

.. code-block:: python

    from pyhooks import precall_register

    class VersionnedEntry(DatabaseEntry):

        @precall_register("save")

        def increment_version(self):

            self.version += 1

The decorator directive indicates to your class that `increment_version` should

be run before the `save` method that is passed to the decorator as argument.

========

Examples

========

You can find some more examples in the `examples/` directory of this

repository.

==============

Advanced usage

==============

You can specialize a register decorator by calling it outside of a decorator

context. The last example would yield:

.. code-block:: python

    from pyhooks import precall_register

    pre_save = precall_register("save")

    class VersionnedEntry(DatabaseEntry):

        @pre_save

        def increment_version(self):

            self.version += 1