[Haskell-cafe] Conduit versions of wai and warp?

Michael Snoyman michael at snoyman.com
Thu Jan 19 10:08:54 CET 2012

On Thu, Jan 19, 2012 at 10:14 AM, Gregory Collins
<greg at gregorycollins.net> wrote:
> On Thu, Jan 19, 2012 at 5:26 AM, Michael Snoyman <michael at snoyman.com>
> wrote:
>> We can still have a conduit-based version of WAI and Warp, even if an
>> underlying package uses enumerator. The enumerator usage from
>> asn1-data doesn't leak into WAI or Warp at all[1]. We could ask
>> Vincent to consider moving over to attoparsec-conduit instead, but I
>> don't think there's any strong need for this.
> Speaking of the migration issue; it should be possible to have an enumerator
> <-> conduit wrapper library to help people continue to use their
> enumerator-based code for awhile (and vice-versa).

I think it's easier said than done. Some conversions should be
straight-forward: turning a Source into an Enumerator, for example.
But others won't be possible without dirty hacks (e.g., Enumerator to
Source will likely require forking a thread and using Chan), while
others may be completely impossible (Enumeratee to Conduit). I agree
such a package is a good idea, and I'd be happy to help anyone who
wants to step up to the plate on it, but I'm not very hopeful that it
will be incredibly useful.


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