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49 lines
1.0 KiB
Python
49 lines
1.0 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015-2019 Mike Fährmann
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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"""Downloader modules"""
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import importlib
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modules = [
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"http",
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"text",
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"ytdl",
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]
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def find(scheme):
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"""Return downloader class suitable for handling the given scheme"""
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try:
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return _cache[scheme]
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except KeyError:
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pass
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klass = None
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if scheme == "https":
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scheme = "http"
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if scheme in modules: # prevent unwanted imports
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try:
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module = importlib.import_module("." + scheme, __package__)
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except ImportError:
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pass
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else:
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klass = module.__downloader__
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if scheme == "http":
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_cache["http"] = _cache["https"] = klass
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else:
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_cache[scheme] = klass
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return klass
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# --------------------------------------------------------------------
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# internals
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_cache = {}
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