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From Benoit Chesneau <bchesn...@gmail.com>
Subject Re: Building substantial "pure" 2 tier CouchApps - feasible?
Date Tue, 12 Jul 2011 08:00:50 GMT
On Tue, Jul 12, 2011 at 4:06 AM, Jason Smith <jhs@iriscouch.com> wrote:
> tl;dr summary: It is practical using external processes to check in
> and keep things sane. This is very future-proof, but with a slightly
> longer time-to-market.
>
> On Tue, Jul 12, 2011 at 6:18 AM, Andrew Stuart (SuperCoders)
> <andrew.stuart@supercoders.com.au> wrote:
>> I'd like to build a rather substantial application, it would be nice to
>> build it as a pure 2 tier CouchApp.
>
> Many have tried.
>
> It is completely impractical to build a pure 2-tier Couch app.
> However, two tiers, plus external helpers ("2.1 tier") is very
> practical.
>
> We've got some difficult days ahead. But it doesn't really matter with
> me now. Because I've been to the mountaintop. I don't mind. Like
> anybody, I would like to build a full-featured Couch app; scalability
> has its place. But I'm not concerned about that now. I just want to do
> God's will. And He's allowed me to go up to the mountain. And I've
> looked over. And I've seen the Promised Land. I may not get there with
> you. But I want you to know tonight, that we, as a people, will get to
> the Promised Land. So I'm happy, tonight. I'm not worried about
> anything. I'm not fearing any <span>.
>
> What I prefer is this: Your programmers develop on and deploy to the
> Couch. Your users also interact directly with the Couch. However,
> *external agents* also access the couch and perform administrative
> tasks as needed.
>
> The benefits of two-tier apps are obvious; I will list a few:
>
> * Simpler
> * Reduced sysadmin workload
> * Excellent future-proofing: multi-datacenter, offline operation, run
> from an iPhone, etc.
>
> Unfortunately, real-world apps are more than a pretty web page. To name a few:
>
> * Send emails or other messages (e.g. push notifications)
> * Help users recover their password
> * Interface with related services: boot EC2 instances, update a DNS
> entry, generate an certificate
> * Notice that somebody is spamming and do the needful
> * Ops stuff: run backups, rotate logs, monitor services. Maybe that's
> an external responsibility; but IMO nowadays that is an application's
> self-hygeine
> * Catch unexpected errors, reassure the user, alert the staff
>
> There is no alternative. You need a third component--admin stuff--to
> build a comprehensive service.

ANother path would be providing a way to code these features inside
couch by providing needed API and the way to script it. Exactly like
it was possible in good old hypercard time.

- benoƮt

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