<div dir="ltr">As in blocking send and connect? I don't know the specifics of Unix Sockets, but don't they block when the buffer fills (I know FIFO queues do)?</div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Mon, May 26, 2014 at 9:22 AM, Paulo Silva <span dir="ltr"><<a href="mailto:pauloasilva@gmail.com" target="_blank">pauloasilva@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
I'm not sure whether I will face problems with other filters modifying<br>
the response body after mine, but for know I'm comfortable as I can<br>
rebuild the full response body just iterating buffers chains.<br>
<br>
As I said before I'm using nginx as reverse proxy and my main goal is<br>
to pass the upstream (proxy_pass) response to another local process<br>
(relative to nginx).<br>
<br>
I am benchmarking Unix sockets and Shared memory as IPC.<br>
I did it already for Unix Sockets and with my prototype the nginx<br>
"performance" dropped for half the number of requests per second. Of<br>
course I'm doing something really bad.<br>
<br>
Is it OK to use socket/connect/send from inside an nginx module?<br>
<br>
I would be glad to hear from you.<br>
Thanks,<br>
<div class="HOEnZb"><div class="h5"><br>
On Fri, May 23, 2014 at 2:50 PM, Paulo Silva <<a href="mailto:pauloasilva@gmail.com">pauloasilva@gmail.com</a>> wrote:<br>
> Because I don't have deep knowledge of nginx internal and I can not<br>
> find a proper resource about it, the best I can do and with what I am<br>
> comfortable is with body_filter.<br>
><br>
> Do you think I can notice whether all other 3rd party module filters<br>
> finish modifying the ngx_chain_t *in ?<br>
><br>
><br>
><br>
> On Fri, May 23, 2014 at 2:41 PM, Maxim Dounin <<a href="mailto:mdounin@mdounin.ru">mdounin@mdounin.ru</a>> wrote:<br>
>> Hello!<br>
>><br>
>> On Fri, May 23, 2014 at 02:17:27PM +0100, Paulo Silva wrote:<br>
>><br>
>>> Hi,<br>
>>><br>
>>> On Fri, May 23, 2014 at 12:58 PM, Maxim Dounin <<a href="mailto:mdounin@mdounin.ru">mdounin@mdounin.ru</a>> wrote:<br>
>>> > Hello!<br>
>>> ><br>
>>> > On Fri, May 23, 2014 at 11:57:20AM +0100, Paulo Silva wrote:<br>
>>> ><br>
>>> >> there is other option than modify the auto/modules file?<br>
>>> >><br>
>>> >> According to my goal (capture the full request response body) I would<br>
>>> >> say that my module must run right before the postpone.<br>
>>> ><br>
>>> > Before the postpone filter you'll get subrequest bodies in your<br>
>>> > filter, which is probably not what you want (the postpone filter<br>
>>> > is to glue subrequest together, correctly ordered).<br>
>>> ><br>
>>> >> Am I supposed to modify the auto/modules like follows?<br>
>>> >><br>
>>> >> if [ $HTTP_POSTPONE = YES ]; then<br>
>>> >> HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_POSTPONE_FILTER_MODULE"<br>
>>> >> HTTP_SRCS="$HTTP_SRCS $HTTP_POSTPONE_FILTER_SRCS"<br>
>>> >> fi<br>
>>> >><br>
>>> >> # insert my module here!<br>
>>> >><br>
>>> >> if [ $HTTP_SSI = YES ]; then<br>
>>> >> have=NGX_HTTP_SSI . auto/have<br>
>>> >> HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_SSI_FILTER_MODULE"<br>
>>> >> HTTP_DEPS="$HTTP_DEPS $HTTP_SSI_DEPS"<br>
>>> >> HTTP_SRCS="$HTTP_SRCS $HTTP_SSI_SRCS"<br>
>>> >> fi<br>
>>> >><br>
>>> >><br>
>>> >> I did check my modules config file and I did realize that it is<br>
>>> >> "queued" as HTTP_AUX_FILTER_MODULES. There are different queues for<br>
>>> >> core modules and addons?<br>
>>> ><br>
>>> > The HTTP_AUX_FILTER_MODULES is a generic queue, and it's the<br>
>>> > only one currently officially supported for 3rd party modules.<br>
>>> ><br>
>>> > If you want your filter to be called right before/after postpone<br>
>>> > filter, it should be relatively safe to put it into the<br>
>>> > HTTP_POSTPONE_FILTER_MODULE variable though (and may be with some<br>
>>> > additional checks to make sure the postpone filter is enabled, or<br>
>>> > just a code to enable it unconditionally).<br>
>>> ><br>
>>><br>
>>> And this is also valid when compiling nginx with the --add-module flag?<br>
>>> How does config file look like?<br>
>>><br>
>>> My knowledge is restricted to Emiller's Guide To Nginx Module<br>
>>> Development (<a href="http://www.evanmiller.org/nginx-modules-guide.html" target="_blank">http://www.evanmiller.org/nginx-modules-guide.html</a>) and a<br>
>>> few debugging hours.<br>
>><br>
>> Uhm, looking again into auto/modules I think I was wrong, and<br>
>> modifying the HTTP_POSTPONE_FILTER_MODULE variable won't work<br>
>> (added module config scripts are executed later on), you should<br>
>> modify HTTP_FILTER_MODULES variable instead, and put your module<br>
>> into a proper position.<br>
>><br>
>> Note that the "config" file of a module is just a shell script,<br>
>> and you are free to do more or less anything there.<br>
>><br>
>> --<br>
>> Maxim Dounin<br>
>> <a href="http://nginx.org/" target="_blank">http://nginx.org/</a><br>
>><br>
>> _______________________________________________<br>
>> nginx-devel mailing list<br>
>> <a href="mailto:nginx-devel@nginx.org">nginx-devel@nginx.org</a><br>
>> <a href="http://mailman.nginx.org/mailman/listinfo/nginx-devel" target="_blank">http://mailman.nginx.org/mailman/listinfo/nginx-devel</a><br>
><br>
><br>
><br>
> --<br>
> Paulo A. Silva<br>
> <a href="http://tech.pauloasilva.com" target="_blank">http://tech.pauloasilva.com</a><br>
> <a href="http://linkedin.com/in/devpauloasilva/" target="_blank">http://linkedin.com/in/devpauloasilva/</a><br>
<br>
<br>
<br>
--<br>
Paulo A. Silva<br>
<a href="http://tech.pauloasilva.com" target="_blank">http://tech.pauloasilva.com</a><br>
<a href="http://linkedin.com/in/devpauloasilva/" target="_blank">http://linkedin.com/in/devpauloasilva/</a><br>
<br>
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</div></div></blockquote></div><br></div>