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"""
This module contains the ExtensionManager which takes care of loading and
keeping track of all enabled extensions. It also contains an instantiated
ExtensionManager (extensions) to be used as singleton.
"""
from scrapy.core.exceptions import NotConfigured
from scrapy.utils.misc import load_object
from scrapy.utils.conf import build_component_list
from scrapy import log
from scrapy.conf import settings
class ExtensionManager(object):
def __init__(self):
self.loaded = False
self.enabled = {}
self.disabled = {}
def load(self):
"""
Load enabled extensions in settings module
"""
self.loaded = False
self.enabled.clear()
self.disabled.clear()
extlist = build_component_list(settings['EXTENSIONS_BASE'], \
settings['EXTENSIONS'])
for extension_path in extlist:
try:
cls = load_object(extension_path)
self.enabled[cls.__name__] = cls()
except NotConfigured, e:
self.disabled[cls.__name__] = extension_path
if e.args:
log.msg(e)
self.loaded = True
def reload(self):
self.load()
extensions = ExtensionManager()
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