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custom handler module - dynamic response with unknown content length

Yasser Zamani
February 28, 2014 02:16PM
Hi there,

I learned some about how to write a handler module from [1] and [2].
[1] http://blog.zhuzhaoyuan.com/2009/08/creating-a-hello-world-nginx-module/
[2] http://www.evanmiller.org/nginx-modules-guide.html#compiling

But I need to rewrite [1] to send dynamically generated octect stream to
client with unknown content length but it'll be large usually. Firstly I
tried:

/* allocate a buffer for your response body */
b = ngx_pcalloc(r->pool, sizeof(ngx_buf_t));
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}

/* attach this buffer to the buffer chain */
out.buf = b;
out.next = NULL;

/* adjust the pointers of the buffer */
b->pos = ngx_hello_string;
b->last = ngx_hello_string + sizeof(ngx_hello_string) - 1;
b->memory = 1; /* this buffer is in memory */
b->last_buf = 0; /* this is the last buffer in the buffer chain */

/* set the status line */
r->headers_out.status = NGX_HTTP_OK;
//r->headers_out.content_length_n = sizeof(ngx_hello_string) - 1;

/* send the headers of your response */
rc = ngx_http_send_header(r);

if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}

/* send the buffer chain of your response */
int i;
for(i=1;i<10000000;i++){b->flush =
(0==(i%1000));rc=ngx_http_output_filter(r,
&out);if(rc!=NGX_OK){ngx_log_error(NGX_LOG_ALERT,r->connection->log,0,"bad
rc, rc:%d", rc);return rc;}}
b->last_buf = 1;
return ngx_http_output_filter(r, &out);

But it simply fails with following errors:

2014/02/28 22:17:25 [alert] 25115#0: *1 zero size buf in writer t:0 r:0
f:0 00000000 080C7431-080C7431 00000000 0-0, client: 127.0.0.1, server:
localhost, request: "GET / HTTP/1.1", host: "localhost:8080"
2014/02/28 22:17:25 [alert] 25115#0: *1 bad rc, rc:-1, client:
127.0.0.1, server: localhost, request: "GET / HTTP/1.1", host:
"localhost:8080"


WHAT IS THE CORRECT WAY TO ACCOMPLISH MY NEED? (I searched a lot but I
only found [3] which has rc=-2 rather than -1)
[3] http://web.archiveorange.com/archive/v/yKUXMLzGBexXA3PccJa6

Thanks in advance!

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Subject Author Posted

custom handler module - dynamic response with unknown content length

Yasser Zamani February 28, 2014 02:16PM

Re: custom handler module - dynamic response with unknown content length

Maxim Dounin February 28, 2014 07:12PM

Re: custom handler module - dynamic response with unknown content length

Yasser Zamani March 01, 2014 04:20AM

Re: custom handler module - dynamic response with unknown content length

Maxim Dounin March 01, 2014 06:32AM

Re: custom handler module - dynamic response with unknown content length

Yasser Zamani March 01, 2014 09:58AM

Re: custom handler module - dynamic response with unknown content length

Yasser Zamani March 01, 2014 12:28PM



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