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Posted to dev@couchdb.apache.org by "Benoit Chesneau (JIRA)" <ji...@apache.org> on 2011/04/30 19:32:03 UTC
[jira] [Commented] (COUCHDB-1046) support load of external erlang
modules in couchdb.
[ https://issues.apache.org/jira/browse/COUCHDB-1046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13027350#comment-13027350 ]
Benoit Chesneau commented on COUCHDB-1046:
------------------------------------------
Is there any more work to do to have it in trunk? Any feedback is appreciated.
> support load of external erlang modules in couchdb.
> ----------------------------------------------------
>
> 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-005.patch, couchdb-plugins-01.patch, couchdb-plugins-02.patch
>
>
> If you want to add external modules in CouchDB and load them , you need to set the ERL_FLAGS environnement variable to the path of a module.
> The attached patch allows couchdb to load plugins from plugin key in couchdb section. It add needed path to the code path, so the vm can find modules.
> ex:
> [couchdb]
> plugins = plugin1, plugin2
> Each plugin can have its own section where it set the binaries patch, eventually if a service need to be added to the supervision you can set the module and function to load like in daemon section and tel if it's a supervisor or simple service.
> It also allows couchdb to load a plugin service (gen_server or such) to the supervision. You can choose if the service is a simple daemon or a supervisor.
> ex:
> [plugin1]
> code_path = /path/to/plugin1/ebin
> daemon = {module, function, [Args]}
> supervisor = 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 integration of external module. For ex I can load my couchapp_ng modules with this lines in local.ini :
> [couchdb]
> plugins = couchapp-ng
> [couchapp-ng]
> code_path=/Users/benoitc/work/couchapp_ng/ebin
> daemon = {couchapp_ng_routes, start_link, []}
> [httpd_design_handlers]
> _app = {couchapp_ng_httpd, handle_app_req}
> [couchapp_ng_handlers]
> rewrite = {couchapp_ng_handlers, rewrite_handler}
> proxy = {couchapp_ng_handlers, proxy_handler}
> and can do the same with geocouch etc. Tested here with these modules.
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