Skip to main content

A module for Python to provide the ability to extend programs using packages, plugins, and extensions.

Project description

Dismantle

Dismantle is a module created for Python programs to provide the ability to provide additional functionality using packages listed within local or remote indices and installed during runtime.

Dismantle does this by checking a package index and using that index to manage package versions. Packages then contain plugins (using decorators) and extensions (using a custom module loader) to add the additional functionality to the application.

Installing Dismantle

Dismantle is available on PyPI:

$ python -m pip install dismantle

NOTE: *Dismantle officially supports Python from 3.7 up

Supported Features & Best–Practices

Dismantle provides the flexibility within applications allowing developers to build rich ecosystems around core applications. It does this by providing the following:

Index Management

Index files are used to provide list of available packages and provide information on packages and the versions of said packages available.

  • support for multiple index files that cascade
  • easy to create custom index handlers providing additional ways to define package indices
  • local index file support using json built in
  • url based index file support using json built in
  • etag based caching for url based index

Packaging

Packages listed in index files provide the ability to bundle features and act as a transport mechanism for additional functionality while providing security.

  • easy to create custom package handlers providing additional ways to define package sources
  • easy to create custom package formats compression types and structures
  • support for zip, tar.gz, tgz, and local directories as package formats built in
  • support for local and url based (http/https) package handlers built in
  • hash validation for packages with the ability to verify package integrity

Extensions

Extensions contained within packages provide a way to dynamically load modules at runtime for Python modules as needed. Packages can replace or extend application functionality at runtime by replacing or adding modules in Pythons global modules manager.

  • Categorized extension groups to filter extension types (eg. loggers, parsers, ...)
  • Support for init or .py based module loading.
  • Extension activation and deactivation management.
  • Module name collision avoidance
  • Hierarchical module naming

Plugins

Plugins contained within packages provide a way to intercept function parameters and return values in order to manipulate data on the fly. Plugins can be used for data validation, manipilation, or to provide additional logging or auditing functionality.

  • Decorator based plugins with pre and post value interceptions and/or modification
  • Multiple plugins per function with ability to set execution order
  • Activation management

Example implementations

Plugin

"""Simple plugin example"""
from dismantle import plugin


class Chat():
    @plugin.register('chat.message')
    def show(self, message):
        print(message)


@plugin.plugin('chat.message', order=-1)
def make_uppercase(message):
    return message.upper()

Extension

"""Full example using all aspects."""
from dismantle.extension import Extensions, IExtension
from dismantle.index import JsonFileIndexHandler
from dismantle.package import LocalPackageHandler


class ColorExtension(IExtension):
    _category = 'color'

    def color(self) -> None:
        ...


class GreenColorExtension(ColorExtension):
    _name = 'green'

    def color(self) -> None:
        print(f'color is {self._name}')


packages = {}
index = JsonFileIndexHandler('index.json')
for pkg_meta in index:
    meta = index[pkg_meta]
    package = LocalPackageHandler(meta['name'], 'foo/path')
    package._meta = {**package._meta, **meta}
    package.install()
    packages[package.name] = package
extensions = Extensions([ColorExtension], packages, 'ext_')
assert extensions.types == ['color']
assert list(extensions.category('color').keys()) == [
    '@scope-one/package-one.extension.green.GreenColorExtension',
    '@scope-one/package-two.extension.red.RedColorExtension',
    '@scope-one/package-three.extension.blue.BlueColorExtension',
]
assert list(extensions.extensions.keys()) == ['color']
assert list(extensions.imports.keys()) == [
    '@scope-one/package-one.extension.green',
    '@scope-one/package-two.extension.red',
    '@scope-one/package-three.extension.blue'
]

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

dismantle-1.1.0.tar.gz (31.2 kB view details)

Uploaded Source

Built Distribution

dismantle-1.1.0-py3-none-any.whl (17.5 kB view details)

Uploaded Python 3

File details

Details for the file dismantle-1.1.0.tar.gz.

File metadata

  • Download URL: dismantle-1.1.0.tar.gz
  • Upload date:
  • Size: 31.2 kB
  • Tags: Source
  • Uploaded using Trusted Publishing? No
  • Uploaded via: pdm/2.4.6 CPython/3.11.2

File hashes

Hashes for dismantle-1.1.0.tar.gz
Algorithm Hash digest
SHA256 046cc428ff8b4b6474e7a49c9ffccfeea85c853c1f1a8ab8d0cc14831603ec63
MD5 82b9d16418b96b7169c06285fabf75d0
BLAKE2b-256 eff8b7a4b7eb582d1468fdd6d81b1aa029e533d5c070b8f9ac049e0728d72483

See more details on using hashes here.

File details

Details for the file dismantle-1.1.0-py3-none-any.whl.

File metadata

  • Download URL: dismantle-1.1.0-py3-none-any.whl
  • Upload date:
  • Size: 17.5 kB
  • Tags: Python 3
  • Uploaded using Trusted Publishing? No
  • Uploaded via: pdm/2.4.6 CPython/3.11.2

File hashes

Hashes for dismantle-1.1.0-py3-none-any.whl
Algorithm Hash digest
SHA256 36d1149e87c6638d0807cdca08aee28dd572ba7f06c9a5d95f456251a387cde9
MD5 a4c95040fc85a22a3812043ef98ab104
BLAKE2b-256 489de5258f0294d5d505b8de4cfa2e68d7775d79432ca13b8412cf7b27df989f

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page