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Date: Thu, 27 Jan 2011 15:50:44 -0500 (EST)
From: "Benoit Chesneau (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Subject: [jira] Commented: (COUCHDB-1046) support load of external erlang
 modules in couchdb.
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    [ https://issues.apache.org/jira/browse/COUCHDB-1046?page=3Dcom.atlassi=
an.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D12=
987752#action_12987752 ]=20

Benoit Chesneau commented on COUCHDB-1046:
------------------------------------------

Installing in  $PREFIX/lib/couchdb/erlang/lib would make difficult to detec=
t plugins or are you suggesting $PREFIX/lib/couchdb/erlang/lib/plugins ?

Which could be better so we make sure plugins are related to one couchbd ve=
rsion.

- beno=C3=AEt


- benoit

> support load of external erlang modules in couchdb.=20
> ----------------------------------------------------
>
>                 Key: COUCHDB-1046
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1046
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core
>            Reporter: Benoit Chesneau
>             Fix For: 1.2
>
>         Attachments: couchdb-plugins-003.patch, couchdb-plugins-004.patch=
, couchdb-plugins-01.patch, couchdb-plugins-02.patch
>
>
> If you want to add external modules in CouchDB and load them , you need t=
o set the ERL_FLAGS environnement variable to the path of a module.=20
> The attached patch allows couchdb to load plugins from plugin key in couc=
hdb section. It add needed path to the code path, so the vm can find module=
s.
> ex:
>    [couchdb]
>    plugins =3D plugin1, plugin2
>  Each plugin can have its own section where it set the binaries patch, ev=
entually if a service need to be added to the supervision you can set the m=
odule and function to load like in daemon section and tel if it's a supervi=
sor or simple service.
> It also allows couchdb to load a plugin service (gen_server or such) to t=
he supervision. You can choose if the service is a simple daemon or a super=
visor.
>  ex:
>    [plugin1]
>    code_path =3D /path/to/plugin1/ebin
>    daemon =3D {module, function, [Args]}
>    supervisor =3D false
> Let me know what you think about it. This patch is really useful here and=
 allows me to dynamically load modules I want. Also it eases the integratio=
n of external module. For ex I can load my couchapp_ng modules with this li=
nes in local.ini :=20
>     [couchdb]
>     plugins =3D couchapp-ng
>     [couchapp-ng]
>     code_path=3D/Users/benoitc/work/couchapp_ng/ebin
>     daemon =3D {couchapp_ng_routes, start_link, []}
>     [httpd_design_handlers]
>     _app =3D {couchapp_ng_httpd, handle_app_req}
>     [couchapp_ng_handlers]
>     rewrite =3D {couchapp_ng_handlers, rewrite_handler}
>     proxy =3D {couchapp_ng_handlers, proxy_handler}
> and can do the same with geocouch etc. Tested here with these modules.

--=20
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