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Nginx write new module as filter.

Walter Dal Mut
October 08, 2011 05:44PM
Hi everybody I am new to nginx and actually I am interested on nginx
extensions.

I need to write a new module for nginx and compile a version with this
module. I don't want to write down an handler but a filter, I need to work
on headers.

For that reason I start my module using gzip as a base and cut different
part that I don't want use.

I compile nginx with my module and all works fine. After that I start the
server with my personal configuration (corley on;) in the main conf file and
the server start correctly. The problem is that my module seems never used.
The filter functionality is pretty simple, I want to force text/plain
header.

I don't understand why my module is never called. Any one can help me?

The main filename is: *ngx_http_corley_filter_module.c*
The configuration filename is:* config*
*
*
The config content:
*
*
ngx_addon_name=ngx_http_corley_filter_module
HTTP_MODULES="$HTTP_MODULES ngx_http_corley_filter_module"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS
$ngx_addon_dir/ngx_http_corley_filter_module.c"


The ngx_http_corley_filter_module.c content:

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>

typedef struct {
ngx_flag_t enable;
} ngx_http_corley_conf_t;

static ngx_int_t ngx_http_corley_filter_init(ngx_conf_t *cf);
static void * ngx_http_corley_create_conf(ngx_conf_t *cf);
static char * ngx_http_corley_merge_conf(ngx_conf_t *cf, void *parent, void
*child);
static void * ngx_http_corley_create_conf(ngx_conf_t *cf);

static ngx_command_t ngx_http_corley_filter_commands[] = {

{ ngx_string("corley"),

NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_corley_conf_t, enable),
NULL },

ngx_null_command
};


static ngx_http_module_t ngx_http_corley_filter_module_ctx = {
NULL, /* preconfiguration */
ngx_http_corley_filter_init, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_corley_create_conf, /* create location configuration
*/
ngx_http_corley_merge_conf /* merge location configuration */
};


ngx_module_t ngx_http_corley_filter_module = {
NGX_MODULE_V1,
&ngx_http_corley_filter_module_ctx, /* module context */
ngx_http_corley_filter_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};


static ngx_http_output_header_filter_pt ngx_http_next_header_filter;
static ngx_http_output_body_filter_pt ngx_http_next_body_filter;


*static ngx_int_t
ngx_http_corley_header_filter(ngx_http_request_t *r)
{
ngx_http_corley_conf_t *conf;
conf = ngx_http_get_module_loc_conf(r, ngx_http_corley_filter_module);

ngx_table_elt_t *h;

h = ngx_list_push(&r->headers_out.headers);
if (h == NULL) {
return NGX_ERROR;
}

h->hash = 1;
ngx_str_set(&h->key, "Content-Encoding");
ngx_str_set(&h->value, "text/plain");

r->headers_out.content_encoding = h;

r->main_filter_need_in_memory = 1;

ngx_http_clear_content_length(r);
ngx_http_clear_accept_ranges(r);


return ngx_http_next_header_filter(r);
}
*

static ngx_int_t
ngx_http_corley_body_filter(ngx_http_request_t *r, ngx_chain_t *in)
{
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"not well formed XML document");
return ngx_http_next_body_filter(r, in);
}

static void *
ngx_http_corley_create_conf(ngx_conf_t *cf)
{
ngx_http_corley_conf_t *conf;

conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_corley_conf_t));
if (conf == NULL) {
return NULL;
}

/*
* set by ngx_pcalloc():
*
* conf->bufs.num = 0;
* conf->types = { NULL };
* conf->types_keys = NULL;
*/

conf->enable = NGX_CONF_UNSET;

return conf;
}


static char *
ngx_http_corley_merge_conf(ngx_conf_t *cf, void *parent, void *child)
{
ngx_http_corley_conf_t *prev = parent;
ngx_http_corley_conf_t *conf = child;

ngx_conf_merge_value(conf->enable, prev->enable, 0);

return NGX_CONF_OK;
}

static ngx_int_t
ngx_http_corley_filter_init(ngx_conf_t *cf)
{
ngx_http_next_header_filter = ngx_http_top_header_filter;
ngx_http_top_header_filter = ngx_http_corley_header_filter;

ngx_http_next_body_filter = ngx_http_top_body_filter;
ngx_http_top_body_filter = ngx_http_corley_body_filter;

return NGX_OK;
}

Thanks to all.
Walter
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Subject Author Views Posted

Nginx write new module as filter.

Walter Dal Mut 1702 October 08, 2011 05:44PM

Re: Nginx write new module as filter.

Simon Liu 481 October 08, 2011 10:02PM

Re: Nginx write new module as filter.

Walter Dal Mut 636 October 09, 2011 04:12AM



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