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From "Benoit Chesneau (JIRA)" <j...@apache.org>
Subject [jira] Updated: (COUCHDB-855) New host manager
Date Fri, 21 Jan 2011 19:23:43 GMT

     [ https://issues.apache.org/jira/browse/COUCHDB-855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benoit Chesneau updated COUCHDB-855:
------------------------------------

    Attachment: COUCHDB-855-2.patch

Without using the gen_server, we have to rebuild the redirect vhost handler function each
time. Also previous patch was loading the vhosts global list on each request like it was before
which make host dispatching slower.

Thhis new patch load vhosts and vhosts gllobal list only when couch_httpd is started. Values
are saved in appliucation env. This version is still a little slower than previous (0.134MS
AGAINS 0.110 MS) but a lot better than the 0.234ms we had before.

> New host manager
> ----------------
>
>                 Key: COUCHDB-855
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-855
>             Project: CouchDB
>          Issue Type: Improvement
>    Affects Versions: 1.1
>            Reporter: Benoit Chesneau
>            Assignee: Benoit Chesneau
>             Fix For: 1.1
>
>         Attachments: 0001-New-vhost-manager.-allows-dynamic-add-of-vhosts-with.patch,
0001-Squashed-commit-of-the-following.patch, COUCHDB-855-1.patch, COUCHDB-855-2.patch
>
>
> New vhost manager. allows dynamic add of vhosts without restart, wildcard in vhost and
specific functions in erlang by kind of domain. It also fix issue in etap test (160) .
> Find attached to this ticket the patch. It is also available in my github repo :
> http://github.com/benoitc/couchdb/commit/435c756cc6e687886cc7055302963f422cf0e161
> more details :
> This gen_server keep state of vhosts added to the ini and try to
> match the Host header (or forwarded) against rules built against
> vhost list. 
> Declaration of vhosts take place in the configuration file :
> [vhosts]
> example.com = /example
> *.example.com = /example
> The first line will rewrite the rquest to display the content of the
> example database. This rule works only if the Host header is
> 'example.com' and won't work for CNAMEs. Second rule on the other hand
> match all CNAMES to example db. So www.example.com or db.example.com
> will work.
> The wildcard ('*') should always be the last in the cnames:
>      "*.db.example.com = /"  will match all cname on top of db
> examples to the root of the machine. (for now no rewriting is
> possible).
> By default vhosts redirection is handle by the function
> couch_httpd_vhost:redirect_to_vhost, but you could pass per vhost a
> specific function :
>      "*.domain.com" = {Module, Func}"
> The function take the Mochiweb Request object and should return a new
> Mochiweb Request object.
> You could also change the default function to handle request by
> changing the setting `redirect_vhost_handler` in `httpd` section of
> the Ini:
>       [httpd]
>       redirect_vhost_handler = {Module, Fun}
> The function take 2 args : the mochiweb request object and the target
> path. 

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