On Wed, 09 Feb 2011, Jesse Rosenthal wrote:
> By the way, I've also realized that most attachment downloading is done
> not by "--format=raw" but by "notmuch part". It's possible to do caching
> there as well. There are a few options there:
> 
>   * One option would be to just cache by the attachment number -- but
>     this is very fragile if you delete an attachment through mutt or
>     some other client that allows it.

This is obviously the simplest possibility. I do not know how often do
you (and others) delete attachments, but I do it rarely and usually I
delete all the attachments of the messages older than something. So this
would work for me.

Additionally, I have added the following command to the attachment
fetching code: 

    find ${CACHE} -ctime +$CACHE_MAX_DAYS -and -mtime +$CACHE_MAX_DAYS -print0 
| xargs -r -0 rm -f

It deletes attachments older than one week (in my case) so it there is
some inconsistency, it would not last more than one week.        

>   * cache by the hash of the attachment. The idea is that asking the
>     server to fetch it, hash it, and send the hash would still save
>     time over sending the whole attachment. Probably -- though most
>     attachments are small enough and most connections are fast enough
>     that this might not actually matter.

If people do more weird things with their attachments, this is probably
the best solution.

>   * Actually stick the attachment hash in the json output in the first
>     place. But this would be a lot of trouble for a small gain for
>     very few.

Agreed.

-Michal
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