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import six
import json
import warnings
from collections import MutableMapping
from importlib import import_module
from scrapy.utils.deprecate import create_deprecated_class
from scrapy.exceptions import ScrapyDeprecationWarning
from . import default_settings
SETTINGS_PRIORITIES = {
'default': 0,
'command': 10,
'project': 20,
'cmdline': 40,
}
class SettingsAttribute(object):
"""Class for storing data related to settings attributes.
This class is intended for internal usage, you should try Settings class
for settings configuration, not this one.
"""
def __init__(self, value, priority):
self.value = value
self.priority = priority
def set(self, value, priority):
"""Sets value if priority is higher or equal than current priority."""
if priority >= self.priority:
self.value = value
self.priority = priority
def __str__(self):
return "<SettingsAttribute value={self.value!r} " \
"priority={self.priority}>".format(self=self)
__repr__ = __str__
class Settings(object):
def __init__(self, values=None, priority='project'):
self.attributes = {}
self.setmodule(default_settings, priority='default')
if values is not None:
self.setdict(values, priority)
def __getitem__(self, opt_name):
value = None
if opt_name in self.attributes:
value = self.attributes[opt_name].value
return value
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(',')
def getdict(self, name, default=None):
value = self.get(name)
if value is None:
return default or {}
if isinstance(value, six.string_types):
value = json.loads(value)
if isinstance(value, dict):
return value
raise ValueError("Cannot convert value for setting '%s' to dict: '%s'" % (name, value))
def set(self, name, value, priority='project'):
if isinstance(priority, six.string_types):
priority = SETTINGS_PRIORITIES[priority]
if name not in self.attributes:
self.attributes[name] = SettingsAttribute(value, priority)
else:
self.attributes[name].set(value, priority)
def setdict(self, values, priority='project'):
for name, value in six.iteritems(values):
self.set(name, value, priority)
def setmodule(self, module, priority='project'):
if isinstance(module, six.string_types):
module = import_module(module)
for key in dir(module):
if key.isupper():
self.set(key, getattr(module, key), priority)
@property
def overrides(self):
warnings.warn("`Settings.overrides` attribute is deprecated and won't "
"be supported in Scrapy 0.26, use "
"`Settings.set(name, value, priority='cmdline')` instead",
category=ScrapyDeprecationWarning, stacklevel=2)
try:
o = self._overrides
except AttributeError:
self._overrides = o = _DictProxy(self, 'cmdline')
return o
@property
def defaults(self):
warnings.warn("`Settings.defaults` attribute is deprecated and won't "
"be supported in Scrapy 0.26, use "
"`Settings.set(name, value, priority='default')` instead",
category=ScrapyDeprecationWarning, stacklevel=2)
try:
o = self._defaults
except AttributeError:
self._defaults = o = _DictProxy(self, 'default')
return o
class _DictProxy(MutableMapping):
def __init__(self, settings, priority):
self.o = {}
self.settings = settings
self.priority = priority
def __len__(self):
return len(self.o)
def __getitem__(self, k):
return self.o[k]
def __setitem__(self, k, v):
self.settings.set(k, v, priority=self.priority)
self.o[k] = v
def __delitem__(self, k):
del self.o[k]
def __iter__(self, k, v):
return iter(self.o)
class CrawlerSettings(Settings):
def __init__(self, settings_module=None, **kw):
Settings.__init__(self, **kw)
self.settings_module = settings_module
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 Settings.__getitem__(self, opt_name)
def __str__(self):
return "<CrawlerSettings module=%r>" % self.settings_module
CrawlerSettings = create_deprecated_class(
'CrawlerSettings', CrawlerSettings,
new_class_path='scrapy.settings.Settings')
def iter_default_settings():
"""Return the default settings as an iterator of (name, value) tuples"""
for name in dir(default_settings):
if name.isupper():
yield name, getattr(default_settings, name)
def overridden_settings(settings):
"""Return a dict of the settings that have been overridden"""
for name, defvalue in iter_default_settings():
value = settings[name]
if not isinstance(defvalue, dict) and value != defvalue:
yield name, value
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