Generation of md5 hash (see cachekey.c).
describe file layout and MD5 hash stuff
path_to_src/firstbyte/secondbyte/fullhash.(cache|key)
item is dict of
- exp_time
- Seconds past the epoch at which this cached
representation expires.
- defer_time
- when using deferred rendering, the expired
component's lifetime is temporarily extended so that it gives the
process time to render it and write it back to the cache. When this
is the case, this is the time at which it expires again, otherwise -1.
- output
- Serialized form of component output.
- full_key
- Serialized form of full cache key.
