Daniel,
I have successfully implemented the router in lua using a lua script called
from a "LuaHookFixups" directive.
LuaHookFixups /var/www/lua/myscript.lua router
-- /var/www/lua/myscript.lua
function router(r)
local route = get_route(r)
if route then
r.filename = "proxy:balancer://" .. route .. r.uri
end
return apache2.DECLINED
end
For the second requirement- i wired up a LuaOutputFilter which can catch
the custom response code. What i was not able to figure out was how to send
the request back to the backend.
LuaOutputFilter myfilter /var/www/lua/myscript.lua output_filter
function output_filter(r)
if r.status ~= 399 then
return
end
coroutine.yield()
while bucket ~= nil do
coroutine.yield(bucket)
end
coroutine.yield()
end
Is it possible to retry the request again from the output filter ?
Regards,
Jose
On Fri, Dec 18, 2015 at 9:42 PM, Daniel Gruno <humbed...@apache.org> wrote:
> I think you need two phases here, as mod_lua doesn't itself do the
> proxying, but delegates it to mod_proxy.
>
> First, http://modlua.org/recipes/loadbalancing will show you how to proxy.
>
> Secondly, you could then set up a handler for the specific HTTP code
> using ErrorDocument or an output filter.
>
> I haven't tried this myself (the 'act on return code'), but it should work.
>
> With regards,
> Daniel.
>
> On 12/18/2015 04:23 PM, Jim Jagielski wrote:
> > I'm not a mod_lua expert, esp as it relates to exposing the
> > full Apache httpd API... it is possible that using r.handler
> > and specifying the proxy may work.
> >
> >> On Dec 18, 2015, at 8:05 AM, Jose Thomas <jos...@gmail.com> wrote:
> >>
> >> Jim,
> >>
> >> Sorry, I could not find the documentation on how to do this using
> mod_lua. Can you please point me there ?
> >>
> >> In my current setup which is on httpd 2.2 - we use modpython. For
> routing requests (based on a header) we use a simple python script. For
> refiring the request (when a custom response code is received), another
> python script is configured in a "PythonOutputFilter". That script
> internally uses the python requests library.
> >>
> >> We are upgrading to httpd 2.4 and wanted to see if this code can be
> ported to mod_lua. I have already ported the first script (routing) to lua.
> Where i am clueless, is how to resend the request to backend for the 2nd
> script in a "LuaOutputFilter".
> >>
> >> Thanks & regards,
> >> Jose
> >>
> >> On Fri, Dec 18, 2015 at 5:08 PM, Jim Jagielski <j...@jagunet.com> wrote:
> >> In general, if you prepend the URL w/ 'proxy:' and then
> >> use it in a subrequest, it will be processed as a proxy
> >> request.
> >>> On Dec 17, 2015, at 9:21 AM, Jose Thomas <jos...@gmail.com> wrote:
> >>>
> >>> All,
> >>>
> >>> I am using httpd 2.4 with mod_proxy (http) routing requests to
> multiple backends.
> >>>
> >>> I have a strange requirement. If a backend responds with a custom
> response code - i need to re-execute the request to a different backend.
> >>>
> >>> What would be the right way to implement this functionality ?
> >>>
> >>> I was looking at mod_lua for a solution. The idea is to use a
> "LuaOutputFilter" to check the response code, and then re-execute the
> request with a different backend. How can i refire the request ? Should i
> use a lua httpclient library for this ? Is there a easier way to do this ?
> >>>
> >>> Any other suggestions/comments are welcome.
> >>>
> >>> Version of stack
> >>> * Apache 2.4.6
> >>> * Lua 5.1.4
> >>>
> >>> Regards,
> >>> Jose
> >>> ____________
> >>>
> >>>
> >>>
> >>
> >>
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> >>
> >
> >
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