[Libwebsockets] protocol plugin
andy at warmcat.com
Thu Feb 2 07:30:19 CET 2017
On 02/02/2017 02:17 PM, Joel Winarske wrote:
> Say I want to implement a single plugin for multiple mount points. In
> the protocol callback, how do I get the mount point string value? Do
> I have to examine the header, or is it already available somewhere?
The right way to look at it is you created a plugin with a single protocol.
It happened that multiple mountpoints, usually on a different vhost each
time, wanted to mount an instance of that protocol somewhere in their
As far as that goes, in itself the protocol callback is not aware of the
mountpoint, and the mounts are all treated the same, although you can
use per-vhost structs in the callback to mean that mounted protocol
instances on each vhost can do things separately.
To make things more useful, you can pass in "pvo", per-vhost options
when you enable the protocol for each vhost individually. For example
the server-status URL I sent before has its protocol enabled like this
So you could just as easily enable the protocol on another vhost, but
with different settings.
There are also "pmo", per-mount options the plugin can access. But pvo
are probably want you want if each mount is on a different vhost.
You can see how the server status plugin gets ahold of the pvo at init
since he stashes them in his per-vhost struct, he can act completely
differently simultaneously depndning on the vhost you access him from.
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