author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Sun, 15 Feb 2009 18:55:05 +0000 | |
changeset 1352 | 4f118840617f |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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from django.template import Library, Node, TemplateSyntaxError, Variable, VariableDoesNotExist |
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from django.template import resolve_variable |
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from django.core.cache import cache |
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from django.utils.encoding import force_unicode |
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parents:
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from django.utils.http import urlquote |
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register = Library() |
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class CacheNode(Node): |
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def __init__(self, nodelist, expire_time_var, fragment_name, vary_on): |
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self.nodelist = nodelist |
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parents:
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self.expire_time_var = Variable(expire_time_var) |
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self.fragment_name = fragment_name |
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self.vary_on = vary_on |
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def render(self, context): |
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parents:
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try: |
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parents:
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expire_time = self.expire_time_var.resolve(context) |
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except VariableDoesNotExist: |
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raise TemplateSyntaxError('"cache" tag got an unknkown variable: %r' % self.expire_time_var.var) |
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parents:
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try: |
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parents:
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expire_time = int(expire_time) |
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except (ValueError, TypeError): |
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raise TemplateSyntaxError('"cache" tag got a non-integer timeout value: %r' % expire_time) |
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# Build a unicode key for this fragment and all vary-on's. |
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parents:
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cache_key = u':'.join([self.fragment_name] + [urlquote(resolve_variable(var, context)) for var in self.vary_on]) |
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value = cache.get(cache_key) |
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if value is None: |
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value = self.nodelist.render(context) |
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parents:
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cache.set(cache_key, value, expire_time) |
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return value |
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def do_cache(parser, token): |
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""" |
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This will cache the contents of a template fragment for a given amount |
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parents:
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of time. |
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parents:
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parents:
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Usage:: |
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parents:
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{% load cache %} |
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Todd Larsen <tlarsen@google.com>
parents:
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{% cache [expire_time] [fragment_name] %} |
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Todd Larsen <tlarsen@google.com>
parents:
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.. some expensive processing .. |
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Todd Larsen <tlarsen@google.com>
parents:
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{% endcache %} |
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Todd Larsen <tlarsen@google.com>
parents:
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parents:
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This tag also supports varying by a list of arguments:: |
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parents:
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parents:
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{% load cache %} |
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{% cache [expire_time] [fragment_name] [var1] [var2] .. %} |
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parents:
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49 |
.. some expensive processing .. |
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parents:
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{% endcache %} |
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parents:
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Each unique set of arguments will result in a unique cache entry. |
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""" |
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nodelist = parser.parse(('endcache',)) |
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parser.delete_first_token() |
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tokens = token.contents.split() |
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if len(tokens) < 3: |
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raise TemplateSyntaxError(u"'%r' tag requires at least 2 arguments." % tokens[0]) |
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return CacheNode(nodelist, tokens[1], tokens[2], tokens[3:]) |
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register.tag('cache', do_cache) |