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From "Filipe Manana (JIRA)" <>
Subject [jira] Commented: (COUCHDB-855) New host manager
Date Wed, 16 Feb 2011 20:54:24 GMT


Filipe Manana commented on COUCHDB-855:

Good call Paul. I'm not familiar at all either with the application environment, so yes there's
always a risk of not using it well or ending up not being reliable enough for this use case.
I also think preferable to let the other processes do all the matching and url processing,
just keeping the most expensive things in the gen_server, so that the gen_server call does
no processing at all (or very very little).

> New host manager
> ----------------
>                 Key: COUCHDB-855
>                 URL:
>             Project: CouchDB
>          Issue Type: Improvement
>    Affects Versions: 1.1
>            Reporter: Benoit Chesneau
>            Assignee: Benoit Chesneau
>            Priority: Blocker
>             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 :
> 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
> * = /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
> '' and won't work for CNAMEs. Second rule on the other hand
> match all CNAMES to example db. So or
> will work.
> The wildcard ('*') should always be the last in the cnames:
>      "* = /"  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 :
>      "*" = {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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