[Twisted-web] getSession, componentized but not async?

[Glyph Lefkowitz]

> On Jul 7, 2016, at 5:14 AM, Carl Waldbieser <cwaldbieser at gmail.com> wrote:
> 
> As for persisting session data-- I guess the idea is that storing or retrieving the session object doesn't need to be async because it is just an object in memory corresponding to a cookie in the request.  However, writing to or reading from the session could definitely require async methods that talk to a back end store.  This could potentially be one area where implementing a component with an interface like `IRedisSessionStorage` might be useful (get session synchonously from request passing in IRedisStorage,  then call `storeThingInSession()` which returns a deferred).

This is an extremely subtle point so I am very happy that it seems to have somehow gotten across :).  Thanks for writing up this answer; it's close to exactly what I would have written.
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