[Snow-users-list] [gambit-list] AWS, Termite, and Snow
jhosteny at gmail.com
Wed Jan 30 08:00:10 EST 2008
On Jan 30, 2008, at 12:05 AM, Marc Feeley wrote:
> On 29-Jan-08, at 11:29 PM, Joe Hosteny wrote:
>> Hi all,
>> First of all, let me preface this email with a disclaimer. I'm
>> new (again) to Scheme (last exposure was 10+ years ago in college).
>> I'm still feeling my way around a bit, and have settled on Gambit,
>> Chicken, and PLT, to a lesser extent. What I'm trying to say is -
>> questions may follow!
>> I recently wrote a library to manage a cluster of machines in
>> Amazon's EC2. I'm looking to totally rewrite it, and port it to
>> in the process. I was also looking at having some facility for
>> managing the cluster from within, with event monitoring via SQS or
>> Termite. Currently, the library does that via polling from a machine
>> external to the cluster. It's not ideal, but was sufficient to get my
>> application working.
>> As a start, I wrote a simple Snow package to do MD5 and SHA1 HMAC
>> calculations (the AWS query string API uses SHA1 signatures).
> The "digest" Snow package does MD5, SHA1, and other digests:
Yes, actually I only wrote the HMAC part, and am using the digests
from this package.
>> started to look around for some utilities for URI parsing and
>> for use in Gambit, but didn't seem to find anything. So, first
>> question - is anyone aware of a suitable package for this?
> Check examples/web-server/http.scm in the Gambit distribution.
>> question - if one doesn't exist, what do people do for regular
>> expression parsing in Gambit?
> I normally use pregexp: http://www.ccs.neu.edu/home/dorai/pregexp/pregexp.html
> It is well written and portable, so it shouldn't be hard to turn it
> into a Snow module.
>> Since I haven't really fleshed out the new architecture, I'm not
>> it's a requirement that I host code to both communicate events across
>> the cluster and issue AWS API calls from within the same executable.
>> So I guess an option would be to use Chicken for the HTTP stuff, and
>> Gambit for Termite and making calls to the code written with Chicken
>> (though at that point, it may make sense to just use one of the Ruby
>> or Java libs for that part). I'd prefer not to, if for nothing more
>> than to be able to contribute the AWS portion as a Chicken or Snow
>> So, a few general questions follow. From recent mailing list
>> discussions, it sounds like Termite will be targeted towards Gambit
>> only, for the time being at least. Guillaume, is that correct? If
>> do you have an idea of when it might be seen on other Schemes
>> (specifically, Chicken or PLT)?
>> Also, does anyone have a feel for what is going on with Snow? It
>> seems like the traffic on the mailing list is a bit slow, and the
>> number of packages is still relatively few.
> I'm still very much interested in continuing to develop Snow.
> However I've been busy with other things recently and hope to get
> back to maintaining Snow more actively soon. To ease the workload
> I'm also looking for someone to take on some of the maintenance
> tasks. Is anyone interested in getting involved?
I may be able to help some. Feel free to contact me off list if you'd
like to discuss.
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