57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
"""
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Caching framework.
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This package defines set of cache backends that all conform to a simple API.
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In a nutshell, a cache is a set of values -- which can be any object that
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may be pickled -- identified by string keys. For the complete API, see
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the abstract BaseCache class in django.core.cache.backends.base.
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Client code should not access a cache backend directly; instead it should
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either use the "cache" variable made available here, or it should use the
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get_cache() function made available here. get_cache() takes a backend URI
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(e.g. "memcached://127.0.0.1:11211/") and returns an instance of a backend
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cache class.
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See docs/cache.txt for information on the public API.
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"""
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from cgi import parse_qsl
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from django.conf import settings
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from django.core.cache.backends.base import InvalidCacheBackendError
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# Name for use in settings file --> name of module in "backends" directory.
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# Any backend scheme that is not in this dictionary is treated as a Python
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# import path to a custom backend.
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BACKENDS = {
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'memcached': 'memcached',
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'locmem': 'locmem',
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'file': 'filebased',
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'db': 'db',
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'dummy': 'dummy',
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}
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def get_cache(backend_uri):
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if backend_uri.find(':') == -1:
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raise InvalidCacheBackendError, "Backend URI must start with scheme://"
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scheme, rest = backend_uri.split(':', 1)
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if not rest.startswith('//'):
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raise InvalidCacheBackendError, "Backend URI must start with scheme://"
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host = rest[2:]
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qpos = rest.find('?')
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if qpos != -1:
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params = dict(parse_qsl(rest[qpos+1:]))
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host = rest[2:qpos]
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else:
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params = {}
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if host.endswith('/'):
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host = host[:-1]
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if scheme in BACKENDS:
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module = __import__('django.core.cache.backends.%s' % BACKENDS[scheme], {}, {}, [''])
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else:
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module = __import__(scheme, {}, {}, [''])
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return getattr(module, 'CacheClass')(host, params)
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cache = get_cache(settings.CACHE_BACKEND)
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