Output filter is not finished

[Dave Bailey]

On Tue, Aug 9, 2011 at 11:00 AM, Adelino Monteiro <adelino at ainou.net> wrote:

> Well since I got no response I suppose that I might have not expressed
> myself properly.
>
> The problem is that I don't know howto tell nginx  that there is no
> information and to go on with the next  request in the output buffer chain.
> I looked at other modules and google around but couldn't find any
> information that I could use.
>

I have found the gzip filter
(src/http/modules/ngx_http_gzip_filter_module.c) to be a useful template for
this.

-dave


> Any help would be appreciated.
>
> AM
>
> On 8 August 2011 16:38, Adelino Monteiro <adelino at ainou.net> wrote:
>
>>
>>
>> Hello,
>>
>> I've build an output filter based on the guide from Evan Miller and some
>> other modules.
>>
>> Everything has been working fine but lately I found that my
>> next_body_filter call is returning NGX_AGAIN.
>> This happens when I only have a very small  chain that won't get processed
>> (I put in the ctx to process the next time), so the call to
>>  ngx_http_next_body_filter(r, in)  basically don't has any output to
>> process.
>> Strangely I see that nginx put my request into a timer but what happens is
>> that after that time the request is broken and the rest of the file don't
>> get processed.
>>
>> Have a look at the output please:
>>
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 http postpone filter "/u2.mp4?"
>> 0000000001A02790
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 write new buf t:0 f:0
>> 0000000000000000, pos 0000000001A0A56C, size: 5 file: 0, size: 0
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 write new buf t:1 f:0
>> 0000000001A6ACB0, pos 0000000001A6ACB0, size: -5 file: 0, size: 0
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 http write filter: l:0 f:1 s:0
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 Save left_bytes [13] in context
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 http copy filter: -2 "/u2.mp4?"
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 http finalize request: -2,
>> "/u2.mp4?" a:1, c:1
>> 2011/08/08 15:45:41 [debug] 11461#0: *1 event timer add: 3:
>> 60000:1312814801328
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 event timer del: 3: 1312814801328
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http run request: "/u2.mp4?"
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http writer handler: "/u2.mp4?"
>> 2011/08/08 15:46:41 [info] 11461#0: *1 client timed out (110: Connection
>> timed out) while sending mp4 to client, client: 192.168.56.1, server:
>> localhost, request: "GET /u2.mp4 HTTP/1.1", host: "192.168.56.101:8080"
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http finalize request: 408,
>> "/u2.mp4?" a:1, c:1
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http terminate request count:1
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http terminate cleanup count:1
>> blk:0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http posted request: "/u2.mp4?"
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http terminate handler count:1
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http request count:1 blk:0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http close request
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 http log handler
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 run cleanup: 0000000001A0A290
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 file cleanup: fd:12
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000000000000
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A6ACB0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A546C0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A098C0, unused: 8
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A02680, unused:
>> 3527
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 close http connection: 3
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 reusable connection: 0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A094B0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A08EB0
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 00000000019FDBE0, unused: 8
>> 2011/08/08 15:46:41 [debug] 11461#0: *1 free: 0000000001A093A0, unused:
>> 128
>>
>> My question is what magic do I need to do in order to tell Nginx that I
>> don't have data to processe this time and to send me other content.
>>
>> I googled around and found some information from 2007 that told me to use
>> timer but I can't find a example with that implementation and don't know if
>> that is any longer supported.
>>
>> Any help is appreciated.
>>
>> AM
>>
>
>
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