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YoutubeIE: reuse instances of InfoExtractors (closes #998)

When a IE is added to the list, it's also added to a dictionary. When a IE is requested it first looks in the dictionary and if there's no instance it will create a new one.

That way _real_initialize is only called once for each IE, saving time if it needs to login for example.
This commit is contained in:
Jaime Marquínez Ferrándiz 2013-07-08 15:14:27 +02:00
parent 81f0259b9e
commit 56c7366547
2 changed files with 20 additions and 3 deletions

View file

@ -97,6 +97,7 @@ class YoutubeDL(object):
def __init__(self, params):
"""Create a FileDownloader object with the given options."""
self._ies = []
self._ies_instances = {}
self._pps = []
self._progress_hooks = []
self._download_retcode = 0
@ -111,8 +112,21 @@ class YoutubeDL(object):
def add_info_extractor(self, ie):
"""Add an InfoExtractor object to the end of the list."""
self._ies.append(ie)
self._ies_instances[ie.ie_key()] = ie
ie.set_downloader(self)
def get_info_extractor(self, ie_key):
"""
Get an instance of an IE with name ie_key, it will try to get one from
the _ies list, if there's no instance it will create a new one and add
it to the extractor list.
"""
ie = self._ies_instances.get(ie_key)
if ie is None:
ie = get_info_extractor(ie_key)()
self.add_info_extractor(ie)
return ie
def add_default_info_extractors(self):
"""
Add the InfoExtractors returned by gen_extractors to the end of the list
@ -294,9 +308,7 @@ class YoutubeDL(object):
'''
if ie_key:
ie = get_info_extractor(ie_key)()
ie.set_downloader(self)
ies = [ie]
ies = [self.get_info_extractor(ie_key)]
else:
ies = self._ies

View file

@ -106,6 +106,11 @@ class InfoExtractor(object):
"""Real extraction process. Redefine in subclasses."""
pass
@classmethod
def ie_key(cls):
"""A string for getting the InfoExtractor with get_info_extractor"""
return cls.__name__[:-2]
@property
def IE_NAME(self):
return type(self).__name__[:-2]