mirror of https://github.com/yt-dlp/yt-dlp
[extractor] Use classmethod/property where possible
and refactor lazy extractors accordingly. This reduces the need to create extractor instancespull/3723/head
pukkandan
3 years ago
parent
7ddbf09c25
commit
82d020804d
@ -1,30 +1,28 @@
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import importlib
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import random
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import re
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from ..utils import bug_reports_message, write_string
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from ..utils import bug_reports_message, classproperty, write_string
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class LazyLoadMetaClass(type):
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def __getattr__(cls, name):
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if '_real_class' not in cls.__dict__:
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# "is_suitable" requires "_TESTS". However, they bloat the lazy_extractors
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if '_real_class' not in cls.__dict__ and name not in ('is_suitable', 'get_testcases'):
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write_string(
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'WARNING: Falling back to normal extractor since lazy extractor '
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f'{cls.__name__} does not have attribute {name}{bug_reports_message()}')
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return getattr(cls._get_real_class(), name)
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f'{cls.__name__} does not have attribute {name}{bug_reports_message()}\n')
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return getattr(cls.real_class, name)
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class LazyLoadExtractor(metaclass=LazyLoadMetaClass):
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_module = None
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_WORKING = True
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@classmethod
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def _get_real_class(cls):
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@classproperty
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def real_class(cls):
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if '_real_class' not in cls.__dict__:
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mod = __import__(cls._module, fromlist=(cls.__name__,))
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cls._real_class = getattr(mod, cls.__name__)
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cls._real_class = getattr(importlib.import_module(cls._module), cls.__name__)
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return cls._real_class
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def __new__(cls, *args, **kwargs):
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real_cls = cls._get_real_class()
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instance = real_cls.__new__(real_cls)
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instance = cls.real_class.__new__(cls.real_class)
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instance.__init__(*args, **kwargs)
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return instance
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@ -1,101 +1,125 @@
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#!/usr/bin/env python3
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import os
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import optparse
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import sys
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from inspect import getsource
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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lazy_extractors_filename = sys.argv[1] if len(sys.argv) > 1 else 'yt_dlp/extractor/lazy_extractors.py'
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NO_ATTR = object()
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STATIC_CLASS_PROPERTIES = ['IE_NAME', 'IE_DESC', 'SEARCH_KEY', '_WORKING', '_NETRC_MACHINE']
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CLASS_METHODS = [
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'ie_key', 'working', 'description', 'suitable', '_match_valid_url', '_match_id', 'get_temp_id',
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]
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IE_TEMPLATE = '''
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class {name}({bases}):
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_module = {module!r}
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'''
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with open('devscripts/lazy_load_template.py', encoding='utf-8') as f:
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MODULE_TEMPLATE = f.read()
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def main():
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parser = optparse.OptionParser(usage='%prog [OUTFILE.py]')
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args = parser.parse_args()[1] or ['yt_dlp/extractor/lazy_extractors.py']
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if len(args) != 1:
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parser.error('Expected only an output filename')
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lazy_extractors_filename = args[0]
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if os.path.exists(lazy_extractors_filename):
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os.remove(lazy_extractors_filename)
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# Block plugins from loading
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plugins_dirname = 'ytdlp_plugins'
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plugins_blocked_dirname = 'ytdlp_plugins_blocked'
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if os.path.exists(plugins_dirname):
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os.rename(plugins_dirname, plugins_blocked_dirname)
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_ALL_CLASSES = get_all_ies() # Must be before import
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from yt_dlp.extractor import _ALL_CLASSES
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from yt_dlp.extractor.common import InfoExtractor, SearchInfoExtractor
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if os.path.exists(plugins_blocked_dirname):
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os.rename(plugins_blocked_dirname, plugins_dirname)
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DummyInfoExtractor = type('InfoExtractor', (InfoExtractor,), {'IE_NAME': NO_ATTR})
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module_src = '\n'.join((
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MODULE_TEMPLATE,
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' _module = None',
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*extra_ie_code(DummyInfoExtractor),
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'\nclass LazyLoadSearchExtractor(LazyLoadExtractor):\n pass\n',
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*build_ies(_ALL_CLASSES, (InfoExtractor, SearchInfoExtractor), DummyInfoExtractor),
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))
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with open('devscripts/lazy_load_template.py', encoding='utf-8') as f:
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module_template = f.read()
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with open(lazy_extractors_filename, 'wt', encoding='utf-8') as f:
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f.write(f'{module_src}\n')
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CLASS_PROPERTIES = ['ie_key', 'working', '_match_valid_url', 'suitable', '_match_id', 'get_temp_id']
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module_contents = [
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module_template,
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*[getsource(getattr(InfoExtractor, k)) for k in CLASS_PROPERTIES],
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'\nclass LazyLoadSearchExtractor(LazyLoadExtractor):\n pass\n']
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ie_template = '''
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class {name}({bases}):
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_module = '{module}'
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'''
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def get_all_ies():
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PLUGINS_DIRNAME = 'ytdlp_plugins'
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BLOCKED_DIRNAME = f'{PLUGINS_DIRNAME}_blocked'
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if os.path.exists(PLUGINS_DIRNAME):
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os.rename(PLUGINS_DIRNAME, BLOCKED_DIRNAME)
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try:
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from yt_dlp.extractor import _ALL_CLASSES
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finally:
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if os.path.exists(BLOCKED_DIRNAME):
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os.rename(BLOCKED_DIRNAME, PLUGINS_DIRNAME)
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return _ALL_CLASSES
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def get_base_name(base):
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if base is InfoExtractor:
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return 'LazyLoadExtractor'
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elif base is SearchInfoExtractor:
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return 'LazyLoadSearchExtractor'
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else:
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return base.__name__
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def extra_ie_code(ie, base=None):
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for var in STATIC_CLASS_PROPERTIES:
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val = getattr(ie, var)
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if val != (getattr(base, var) if base else NO_ATTR):
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yield f' {var} = {val!r}'
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yield ''
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for name in CLASS_METHODS:
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f = getattr(ie, name)
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if not base or f.__func__ != getattr(base, name).__func__:
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yield getsource(f)
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def build_lazy_ie(ie, name):
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s = ie_template.format(
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name=name,
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bases=', '.join(map(get_base_name, ie.__bases__)),
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module=ie.__module__)
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valid_url = getattr(ie, '_VALID_URL', None)
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if not valid_url and hasattr(ie, '_make_valid_url'):
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valid_url = ie._make_valid_url()
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if valid_url:
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s += f' _VALID_URL = {valid_url!r}\n'
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if not ie._WORKING:
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s += ' _WORKING = False\n'
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if ie.suitable.__func__ is not InfoExtractor.suitable.__func__:
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s += f'\n{getsource(ie.suitable)}'
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return s
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def build_ies(ies, bases, attr_base):
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names = []
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for ie in sort_ies(ies, bases):
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yield build_lazy_ie(ie, ie.__name__, attr_base)
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if ie in ies:
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names.append(ie.__name__)
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# find the correct sorting and add the required base classes so that subclasses
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# can be correctly created
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classes = _ALL_CLASSES[:-1]
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ordered_cls = []
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yield f'\n_ALL_CLASSES = [{", ".join(names)}]'
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def sort_ies(ies, ignored_bases):
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"""find the correct sorting and add the required base classes so that subclasses can be correctly created"""
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classes, returned_classes = ies[:-1], set()
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assert ies[-1].__name__ == 'GenericIE', 'Last IE must be GenericIE'
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while classes:
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for c in classes[:]:
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bases = set(c.__bases__) - {object, InfoExtractor, SearchInfoExtractor}
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stop = False
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bases = set(c.__bases__) - {object, *ignored_bases}
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restart = False
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for b in bases:
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if b not in classes and b not in ordered_cls:
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if b.__name__ == 'GenericIE':
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exit()
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if b not in classes and b not in returned_classes:
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assert b.__name__ != 'GenericIE', 'Cannot inherit from GenericIE'
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classes.insert(0, b)
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stop = True
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if stop:
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restart = True
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if restart:
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break
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if all(b in ordered_cls for b in bases):
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ordered_cls.append(c)
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if bases <= returned_classes:
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yield c
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returned_classes.add(c)
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classes.remove(c)
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break
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ordered_cls.append(_ALL_CLASSES[-1])
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yield ies[-1]
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names = []
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for ie in ordered_cls:
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name = ie.__name__
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src = build_lazy_ie(ie, name)
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module_contents.append(src)
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if ie in _ALL_CLASSES:
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names.append(name)
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module_contents.append(
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'\n_ALL_CLASSES = [{}]'.format(', '.join(names)))
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def build_lazy_ie(ie, name, attr_base):
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bases = ', '.join({
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'InfoExtractor': 'LazyLoadExtractor',
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'SearchInfoExtractor': 'LazyLoadSearchExtractor',
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}.get(base.__name__, base.__name__) for base in ie.__bases__)
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module_src = '\n'.join(module_contents) + '\n'
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s = IE_TEMPLATE.format(name=name, module=ie.__module__, bases=bases)
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valid_url = getattr(ie, '_VALID_URL', None)
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if not valid_url and hasattr(ie, '_make_valid_url'):
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valid_url = ie._make_valid_url()
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if valid_url:
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s += f' _VALID_URL = {valid_url!r}\n'
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return s + '\n'.join(extra_ie_code(ie, attr_base))
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with open(lazy_extractors_filename, 'wt', encoding='utf-8') as f:
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f.write(module_src)
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if __name__ == '__main__':
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main()
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