Nginx write new module as filter.
Walter Dal Mut
info at walterdalmut.com
Sun Oct 9 08:09:38 UTC 2011
Thank you Simon,
Now the filter is engaged and works.
Thank you so much.
Walter
On 9 October 2011 04:00, Simon Liu <simohayha.bobo at gmail.com> wrote:
> 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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>
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