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From: Jan Lehnardt <jan@apache.org>
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Subject: Re: Post on Trigger
Date: Thu, 19 May 2016 18:12:59 +0200
References: <DUB128-W62E3011C01754F0FFE1533F44A0@phx.gbl> <D255860A-9B7E-4A05-A233-721DAAA786AE@apache.org> <CAOikdzuM3Tg-agv2zzZau3Wxaf6M4pGFtU484L8LRyRAMbNOSQ@mail.gmail.com>
To: dev@couchdb.apache.org
In-Reply-To: <CAOikdzuM3Tg-agv2zzZau3Wxaf6M4pGFtU484L8LRyRAMbNOSQ@mail.gmail.com>
archived-at: Thu, 19 May 2016 16:13:09 -0000

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> On 19 May 2016, at 18:03, Matthew Rijk <mrijk11@gmail.com> wrote:
>=20
> How can i unsubscribe to this feed

This is the documentation: =
http://docs.couchdb.org/en/1.6.1/api/database/changes.html

Best
Jan
--

>=20
> On Thu, May 19, 2016 at 9:06 AM, Jan Lehnardt <jan@apache.org> wrote:
>=20
>> Heya,
>>=20
>> the easiest way to build this today is with a CouchDB External:
>> http://docs.couchdb.org/en/1.6.1/externals.html that listens to a
>> _changes feed.
>>=20
>> You can use changes feed filters (
>> http://docs.couchdb.org/en/1.6.1/api/database/changes.html) to get =
the
>> =E2=80=9Conly when a doc is emitted=E2=80=9D type of event you =
mention (or you filter that
>> in your external script). =46rom the script then you can do whatever =
you want.
>>=20
>> A CouchDB External is started and stopped (and kept alive) by CouchDB
>> itself, so you are saving yourself the effort of a system integration
>> startup script.
>>=20
>> Best
>> Jan
>> --
>>=20
>>=20
>>> On 19 May 2016, at 13:49, Reddy B. <reddy.b@live.fr> wrote:
>>>=20
>>> Hi,
>>>=20
>>> I am fairly new to CouchDb and loving it so far. I think this =
database
>> is shockingly underated. I love the "Relax" approach and the design
>> choices  that have been done, and I hope things will continue with =
the same
>> philosophy.
>>>=20
>>> I couldn't find if this has been discussed before but I was thinking
>> that it would be extremely cool to be able to setup triggers that =
POST
>> arbitrary json to arbitrary endpoints. I think this would be a killer
>> feature if there was built-in support for that - and seems to fit =
well with
>> the HTTP approach of couch.
>>>=20
>>> So basically, this would be about allowing us to add an arbitrary =
number
>> of triggers to any view. Each trigger would be called only if the =
view
>> emitted "something" and the trigger would receive the document passed =
as a
>> parameter to the view (this is to take advantage of the update =
frequency of
>> views) Then in terms of posting, there could be a new built-in =
javascript
>> function calling curl behind the scenes which can be called from the
>> triggers.
>>>=20
>>> For the same purpose, it would be interesting to introduce =
configuration
>> documents at the database level whose properties could be accessed =
from
>> these triggers (I'm thinking of situations when one would need to =
call a
>> different URL when in testing, staging, production etc...)
>>>=20
>>> In terms of use case, this would allow us to do things as diverse as
>> sending email notifications, and maintenance tasks. More generally, =
this
>> would eliminate the need for most of the maintenance jobs out there =
while
>> making these systems much more efficient by removing the need to run =
jobs
>> at arbitrary times even when this is not necessary. Also, since most =
web
>> frameworks are asynchronous and process each request in a different
>> thread,  this would be a way to easily parallelize certain =
operations.
>>>=20
>>> I just wanted to know if there was any chance to see this come out =
one
>> day or if this would be a "no-go" for design of philosophical =
reasons.
>>>=20
>>> Cheers,
>>>=20
>>> Reddy
>>>=20
>>=20
>> --
>> Professional Support for Apache CouchDB:
>> https://neighbourhood.ie/couchdb-support/
>>=20
>>=20

--=20
Professional Support for Apache CouchDB:
https://neighbourhood.ie/couchdb-support/


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