Cache templatetag with memcached can't handle long tags

[235]

similar to #10016
Memcached has a hard limit of 250 characters for cache keys.

So we have to use md5 hash instead of the whole cached tag name with all vary variables.

Traceback (most recent call last):

  File "/var/www/virtual/sumno.com/modules/django/core/handlers/base.py", line 86, in get_response
    response = callback(request, *callback_args, **callback_kwargs)

  File "/var/www/virtual/sumno.com/htdocs/sumnocom/apps/lib/decorators.py", line 56, in wrapper
    return func(request, *args, **kwargs)

  File "/var/www/virtual/sumno.com/htdocs/sumnocom/../sumnocom/apps/generic_content/views.py", line 370, in detail_view_content_entry
    context_instance=RequestContext(request))

  File "/var/www/virtual/sumno.com/modules/django/shortcuts/__init__.py", line 18, in render_to_response
    return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs)

  File "/var/www/virtual/sumno.com/modules/django/template/loader.py", line 107, in render_to_string
    return t.render(context_instance)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 176, in render
    return self.nodelist.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/loader_tags.py", line 97, in render
    return compiled_parent.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 176, in render
    return self.nodelist.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/loader_tags.py", line 97, in render
    return compiled_parent.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 176, in render
    return self.nodelist.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/loader_tags.py", line 24, in render
    result = self.nodelist.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/htdocs/sumnocom/apps/lib/templatetags/smartspaceless.py", line 17, in render
    s = self.nodelist.render(context).strip()

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/loader_tags.py", line 24, in render
    result = self.nodelist.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/loader_tags.py", line 24, in render
    result = self.nodelist.render(context)

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 768, in render
    bits.append(self.render_node(node, context))

  File "/var/www/virtual/sumno.com/modules/django/template/__init__.py", line 781, in render_node
    return node.render(context)

  File "/var/www/virtual/sumno.com/modules/django/templatetags/cache.py", line 27, in render
    value = cache.get(cache_key)

  File "/var/www/virtual/sumno.com/modules/django/core/cache/backends/memcached.py", line 25, in get
    val = self._cache.get(smart_str(key))

  File "/var/lib/python-support/python2.5/memcache.py", line 619, in get
    check_key(key)

  File "/var/lib/python-support/python2.5/memcache.py", line 885, in check_key
    % SERVER_MAX_KEY_LENGTH)

MemcachedKeyLengthError: Key length is > 250

[235]

django/templatetags/cache.py patch

[Chris Beaven]

If Jacob thought #10016 was 1.1 worthy, this should be too.

[Russell Keith-Magee]

(In [11067]) Fixed #11270 -- Corrected naming conflict in templatetag test. Thanks to steveire for the report.

[Russell Keith-Magee]

(In [11068]) Fixed #11270 -- Modified cache template tag to prevent the creation of very long cache keys. Thanks to 235 for the report and patch.

[Russell Keith-Magee]

Please ignore the commit message for [11067] - that commit should have referenced #11289.

[Russell Keith-Magee]

(In [11070]) [1.0.X] Fixed #11270 -- Modified cache template tag to prevent the creation of very long cache keys. Thanks to 235 for the report and patch.

Merge of r11068 from trunk.

[Jacob]

Milestone 1.1 deleted