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from . import default_settings
class Settings(object):
def __init__(self, values=None):
self.values = values.copy() if values else {}
self.global_defaults = default_settings
def __getitem__(self, opt_name):
if opt_name in self.values:
return self.values[opt_name]
return getattr(self.global_defaults, opt_name, None)
def get(self, name, default=None):
return self[name] if self[name] is not None else default
def getbool(self, name, default=False):
"""
True is: 1, '1', True
False is: 0, '0', False, None
"""
return bool(int(self.get(name, default)))
def getint(self, name, default=0):
return int(self.get(name, default))
def getfloat(self, name, default=0.0):
return float(self.get(name, default))
def getlist(self, name, default=None):
value = self.get(name)
if value is None:
return default or []
elif hasattr(value, '__iter__'):
return value
else:
return str(value).split(',')
class CrawlerSettings(Settings):
def __init__(self, settings_module=None, **kw):
super(CrawlerSettings, self).__init__(**kw)
self.settings_module = settings_module
self.overrides = {}
self.defaults = {}
def __getitem__(self, opt_name):
if opt_name in self.overrides:
return self.overrides[opt_name]
if self.settings_module and hasattr(self.settings_module, opt_name):
return getattr(self.settings_module, opt_name)
if opt_name in self.defaults:
return self.defaults[opt_name]
return super(CrawlerSettings, self).__getitem__(opt_name)
def __str__(self):
return "<CrawlerSettings module=%r>" % self.settings_module
class SpiderSettings(Settings):
def __init__(self, spider, crawler_settings, **kw):
super(SpiderSettings, self).__init__(**kw)
self.spider = spider
self.cset = crawler_settings
def __getitem__(self, opt_name):
if opt_name in self.cset.overrides:
return self.cset.overrides[opt_name]
if hasattr(self.spider, opt_name):
return getattr(self.spider, opt_name)
if self.cset.settings_module and hasattr(self.cset.settings_module, opt_name):
return getattr(self.cset.settings_module, opt_name)
if opt_name in self.cset.defaults:
return self.cset.defaults[opt_name]
return super(SpiderSettings, self).__getitem__(opt_name)
def __str__(self):
return "<SpiderSettings spider=%r>" % self.spider.name
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