284 lines
7.4 KiB
Python
284 lines
7.4 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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This file is part of the web2py Web Framework
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Copyrighted by Massimo Di Pierro <mdipierro@cs.depaul.edu>
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License: LGPLv3 (http://www.gnu.org/licenses/lgpl.html)
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Provides:
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- List; like list but returns None instead of IndexOutOfBounds
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- Storage; like dictionary allowing also for `obj.foo` for `obj['foo']`
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"""
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import cPickle
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import gluon.portalocker as portalocker
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__all__ = ['List', 'Storage', 'Settings', 'Messages',
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'StorageList', 'load_storage', 'save_storage']
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DEFAULT = lambda:0
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class Storage(dict):
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"""
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A Storage object is like a dictionary except `obj.foo` can be used
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in addition to `obj['foo']`, and setting obj.foo = None deletes item foo.
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>>> o = Storage(a=1)
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>>> print o.a
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1
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>>> o['a']
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1
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>>> o.a = 2
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>>> print o['a']
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2
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>>> del o.a
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>>> print o.a
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None
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"""
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__slots__ = ()
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__setattr__ = dict.__setitem__
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__delattr__ = dict.__delitem__
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__getitem__ = dict.get
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__getattr__ = dict.get
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__repr__ = lambda self: '<Storage %s>' % dict.__repr__(self)
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# http://stackoverflow.com/questions/5247250/why-does-pickle-getstate-accept-as-a-return-value-the-very-instance-it-requi
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__getstate__ = lambda self: None
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__copy__ = lambda self: Storage(self)
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def getlist(self, key):
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"""
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Return a Storage value as a list.
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If the value is a list it will be returned as-is.
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If object is None, an empty list will be returned.
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Otherwise, [value] will be returned.
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Example output for a query string of ?x=abc&y=abc&y=def
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>>> request = Storage()
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>>> request.vars = Storage()
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>>> request.vars.x = 'abc'
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>>> request.vars.y = ['abc', 'def']
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>>> request.vars.getlist('x')
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['abc']
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>>> request.vars.getlist('y')
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['abc', 'def']
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>>> request.vars.getlist('z')
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[]
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"""
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value = self.get(key, [])
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if value is None or isinstance(value, (list, tuple)):
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return value
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else:
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return [value]
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def getfirst(self, key, default=None):
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"""
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Return the first or only value when given a request.vars-style key.
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If the value is a list, its first item will be returned;
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otherwise, the value will be returned as-is.
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Example output for a query string of ?x=abc&y=abc&y=def
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>>> request = Storage()
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>>> request.vars = Storage()
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>>> request.vars.x = 'abc'
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>>> request.vars.y = ['abc', 'def']
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>>> request.vars.getfirst('x')
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'abc'
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>>> request.vars.getfirst('y')
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'abc'
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>>> request.vars.getfirst('z')
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"""
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values = self.getlist(key)
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return values[0] if values else default
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def getlast(self, key, default=None):
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"""
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Returns the last or only single value when
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given a request.vars-style key.
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If the value is a list, the last item will be returned;
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otherwise, the value will be returned as-is.
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Simulated output with a query string of ?x=abc&y=abc&y=def
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>>> request = Storage()
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>>> request.vars = Storage()
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>>> request.vars.x = 'abc'
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>>> request.vars.y = ['abc', 'def']
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>>> request.vars.getlast('x')
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'abc'
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>>> request.vars.getlast('y')
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'def'
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>>> request.vars.getlast('z')
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"""
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values = self.getlist(key)
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return values[-1] if values else default
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PICKABLE = (str, int, long, float, bool, list, dict, tuple, set)
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class StorageList(Storage):
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"""
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like Storage but missing elements default to [] instead of None
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"""
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def __getitem__(self, key):
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return self.__getattr__(key)
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def __getattr__(self, key):
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if key in self:
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return getattr(self, key)
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else:
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r = []
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setattr(self, key, r)
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return r
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def load_storage(filename):
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fp = None
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try:
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fp = portalocker.LockedFile(filename, 'rb')
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storage = cPickle.load(fp)
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finally:
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if fp:
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fp.close()
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return Storage(storage)
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def save_storage(storage, filename):
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fp = None
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try:
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fp = portalocker.LockedFile(filename, 'wb')
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cPickle.dump(dict(storage), fp)
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finally:
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if fp:
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fp.close()
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class Settings(Storage):
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def __setattr__(self, key, value):
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if key != 'lock_keys' and self['lock_keys'] and key not in self:
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raise SyntaxError('setting key \'%s\' does not exist' % key)
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if key != 'lock_values' and self['lock_values']:
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raise SyntaxError('setting value cannot be changed: %s' % key)
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self[key] = value
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class Messages(Settings):
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def __init__(self, T):
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Storage.__init__(self, T=T)
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def __getattr__(self, key):
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value = self[key]
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if isinstance(value, str):
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return str(self.T(value))
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return value
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class FastStorage(dict):
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"""
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Eventually this should replace class Storage but causes memory leak
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because of http://bugs.python.org/issue1469629
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>>> s = FastStorage()
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>>> s.a = 1
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>>> s.a
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1
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>>> s['a']
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1
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>>> s.b
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>>> s['b']
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>>> s['b']=2
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>>> s['b']
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2
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>>> s.b
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2
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>>> isinstance(s,dict)
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True
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>>> dict(s)
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{'a': 1, 'b': 2}
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>>> dict(FastStorage(s))
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{'a': 1, 'b': 2}
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>>> import pickle
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>>> s = pickle.loads(pickle.dumps(s))
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>>> dict(s)
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{'a': 1, 'b': 2}
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>>> del s.b
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>>> del s.a
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>>> s.a
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>>> s.b
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>>> s['a']
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>>> s['b']
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"""
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def __init__(self, *args, **kwargs):
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dict.__init__(self, *args, **kwargs)
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self.__dict__ = self
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def __getattr__(self, key):
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return getattr(self, key) if key in self else None
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def __getitem__(self, key):
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return dict.get(self, key, None)
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def copy(self):
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self.__dict__ = {}
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s = FastStorage(self)
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self.__dict__ = self
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return s
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def __repr__(self):
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return '<Storage %s>' % dict.__repr__(self)
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def __getstate__(self):
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return dict(self)
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def __setstate__(self, sdict):
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dict.__init__(self, sdict)
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self.__dict__ = self
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def update(self, *args, **kwargs):
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dict.__init__(self, *args, **kwargs)
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self.__dict__ = self
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class List(list):
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"""
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Like a regular python list but a[i] if i is out of bounds return None
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instead of IndexOutOfBounds
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"""
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def __call__(self, i, default=DEFAULT, cast=None, otherwise=None):
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"""
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request.args(0,default=0,cast=int,otherwise='http://error_url')
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request.args(0,default=0,cast=int,otherwise=lambda:...)
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"""
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n = len(self)
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if 0 <= i < n or -n <= i < 0:
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value = self[i]
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elif default is DEFAULT:
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value = None
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else:
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value, cast = default, False
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if cast:
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try:
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value = cast(value)
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except (ValueError, TypeError):
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from http import HTTP, redirect
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if otherwise is None:
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raise HTTP(404)
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elif isinstance(otherwise, str):
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redirect(otherwise)
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elif callable(otherwise):
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return otherwise()
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else:
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raise RuntimeError("invalid otherwise")
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return value
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if __name__ == '__main__':
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import doctest
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doctest.testmod()
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