[Libwebsockets] CGI on lws

James Stormes jstormes at stormes.net
Tue Feb 23 17:00:24 CET 2016


This is exactly what I am waiting for.  I work mostly in ASP C# and/or PHP
and need to connect live data updates on the server to javascript.  My
current best practice is long poll AJAX, but scalability is an issue.

What I am looking for, and time permitting trying to build, is all the
plumbing.  What you are doing can takes us a long way to connecting PHP on
the server to JavaScript in the browser via web sockets.

My suggestion is to build out enough to get connected to something like PHP
and get some example code working so we can start finding issues in the
design, and developing the techniques and best practice in the higher level

*James Stormes*
*Software Developer*
(817) 676-4291 (Cell)

Zend Certified Engineer <http://www.zend.com/en/yellow-pages/ZEND026190>

On Tue, Feb 23, 2016 at 5:06 AM, Andy Green <andy at warmcat.com> wrote:

> Hi -
> I am working on adding a cmake-selectable CGI api to lws, basically
> lws_cgi(struct lws *wsi, char * const *exec_array);
> lws_cgi_kill(struct lws *wsi);
> where the forked process' stdin/out/err is piped on to three slave wsi
> created in the same service thread as the master: these are managed through
> the same event loop as everything else, when the process has output, his
> pipe fd POLLIN fires and there's a user callback where the user code can
> wire it up to outputting it when the sink socket is writeable.  That
> happens piecemeal and multitasked according to the combination of server,
> network and process conditions; the user code in the callback can choose to
> wire it up to http[s] or ws[s] according to what they want.
> The guts of it work already in my local tree, but there are quite a lot of
> things to take care about with regard to managing the event loop properly
> for all cases, as well as deal with POST -> stdin and that might take a
> while.
> The goal of it is to provide a primitive with which you can easily spawn
> "io-encapsulated" subprocesses to the network, ie, run cgi like mailman or
> general scripts or web language interpreters.
> I am curious if potential users of it have any comments or suggestions
> about this direction, since it's one of decreasing number of missing bits
> in the lws toolkit from the point of view of it being able to make a
> generic webserver.
> -Andy
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