Nginx write new module as filter.
Simon Liu
simohayha.bobo at gmail.com
Sun Oct 9 02:00:21 UTC 2011
You should use HTTP_AUX_FILTER_MODULES="$HTTP_AUX_FILTER_MODULES
ngx_http_corley_filter_module" rather than HTTP_MODULES="$HTTP_MODULES
ngx_http_corley_filter_module"
On Sun, Oct 9, 2011 at 5:42 AM, Walter Dal Mut <info at walterdalmut.com>wrote:
> 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
>
> _______________________________________________
> nginx-devel mailing list
> nginx-devel at nginx.org
> http://mailman.nginx.org/mailman/listinfo/nginx-devel
>
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