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Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent"

Maxim Dounin
January 27, 2010 07:50AM
Hello!

Just a note: it's probably better idea to post patches to
nginx-devel@. Cc'd.

On Wed, Jan 27, 2010 at 06:04:16PM +0800, tOmasEn wrote:

> Maybe not many people using xslt as main web layout. but I do.
>
> This patch is similar to gzip_disable. xslt_enable only enable xslt
> transform for certain user agent.
>
> e.g.
> xslt_enable "Googlebot"
> will only enable xslt transform output for google's crawler.

While I tend to think this is good feature (though not sure), I
also think that it probably needs some better name. Something
more self-explaining.

Also it's probably better to make xslt controllable via variable
instead. This will handle you "disable via special header" case
as well.

> And, I'm also planing some other improve on xslt module. Like: when xslt
> transform failed, output original xml file instead of 500 server error; Skip
> xslt transform if client send specified HTTP header like "No-XSLT", etc.
> Should I talk to somebody and discuss the architect?
>
> --
> Tomasen
> http://twitter.com/ShooterPlayer
> http://t.sina.com.cn/Tomasen

> *** ../nginx-0.8.31/src/http/modules/ngx_http_xslt_filter_module.c 2010-01-27 17:23:37.000000000 +0800
> --- nginx-0.8.31/src/http/modules/ngx_http_xslt_filter_module.c 2009-11-30 21:15:10.000000000 +0800
> ***************
> *** 48,54 ****

Please use unified diff patches, and not reversed ones.

> ngx_array_t sheets; /* ngx_http_xslt_sheet_t */
> ngx_hash_t types;
> ngx_array_t *types_keys;
> - ngx_array_t *xslt_enable; /* xslt_enable */

Comment is pointless and wrongly placed. Just remove it.

> } ngx_http_xslt_filter_loc_conf_t;
>
>
> --- 48,53 ----
> ***************
> *** 135,143 ****
> void *child);
> static ngx_int_t ngx_http_xslt_filter_init(ngx_conf_t *cf);
> static void ngx_http_xslt_filter_exit(ngx_cycle_t *cycle);
> !
> ! static char *ngx_http_xslt_enable(ngx_conf_t *cf, ngx_command_t *cmd,
> ! void *conf);

1. Please follow nginx style.

2. Please move this to other config parsing functions.

>
> ngx_str_t ngx_http_xslt_default_types[] = {
> ngx_string("text/xml"),
> --- 134,140 ----
> void *child);
> static ngx_int_t ngx_http_xslt_filter_init(ngx_conf_t *cf);
> static void ngx_http_xslt_filter_exit(ngx_cycle_t *cycle);
> !
>
> ngx_str_t ngx_http_xslt_default_types[] = {
> ngx_string("text/xml"),
> ***************
> *** 168,183 ****
> offsetof(ngx_http_xslt_filter_loc_conf_t, types_keys),
> &ngx_http_xslt_default_types[0] },
>
> ! { ngx_string("xslt_enable"),
> ! NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
> ! ngx_http_xslt_enable,
> ! NGX_HTTP_LOC_CONF_OFFSET,
> ! offsetof(ngx_http_xslt_filter_loc_conf_t, xslt_enable),
> ! NULL },
> !
> ! ngx_null_command
> };
>
> static ngx_http_module_t ngx_http_xslt_filter_module_ctx = {
> NULL, /* preconfiguration */
> ngx_http_xslt_filter_init, /* postconfiguration */
> --- 165,174 ----
> offsetof(ngx_http_xslt_filter_loc_conf_t, types_keys),
> &ngx_http_xslt_default_types[0] },
>
> ! ngx_null_command
> };
>
> +

Unrelated (and wrong) whitespace change here.

> static ngx_http_module_t ngx_http_xslt_filter_module_ctx = {
> NULL, /* preconfiguration */
> ngx_http_xslt_filter_init, /* postconfiguration */
> ***************
> *** 212,289 ****
> 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 char *
> - ngx_http_xslt_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
> - {

Please move config parsing function to other config parsing
functions.

> - ngx_http_xslt_filter_loc_conf_t *clcf = conf;
> -
> - #if (NGX_PCRE)
> - ngx_str_t *value;
> - ngx_uint_t i;
> - ngx_regex_elt_t *re;
> - ngx_regex_compile_t rc;
> - u_char errstr[NGX_MAX_CONF_ERRSTR];
> -
> - if (clcf->xslt_enable == NULL) {
> - clcf->xslt_enable = ngx_array_create(cf->pool, 2,
> - sizeof(ngx_regex_elt_t));
> - if (clcf->xslt_enable == NULL) {
> - return NGX_CONF_ERROR;
> - }

No tabs, please.

> - }else{
> - //xslt_enable_is_not_required
> - return NGX_CONF_OK;

1. No C++ comments, please.

2. You should either return error here (something like return "is
duplicate") or append to list as gzip_disable do. Blindly
ignoring configuration directive isn't what nginx generally do.

> - }
> -
> - value = cf->args->elts;
> -
> - ngx_memzero(&rc, sizeof(ngx_regex_compile_t));
> -
> - rc.pool = cf->pool;
> - rc.err.len = NGX_MAX_CONF_ERRSTR;
> - rc.err.data = errstr;
> -
> - for (i = 1; i < cf->args->nelts; i++) {
> -
> - re = ngx_array_push(clcf->xslt_enable);
> - if (re == NULL) {
> - return NGX_CONF_ERROR;
> - }
> -
> - rc.pattern = value[1];
> - rc.options = NGX_REGEX_CASELESS;
> -
> - if (ngx_regex_compile(&rc) != NGX_OK) {
> - ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "%V", &rc.err);
> - return NGX_CONF_ERROR;
> - }
> -
> - re->regex = rc.regex;
> - re->name = value[i].data;
> -
> - }
> -
> - return NGX_CONF_OK;
> -
> - #else
> - ngx_str_t *value;
> -
> - value = cf->args->elts;

Any reason to use value here? Looks like cut-n-paste leftover
from gzip_disable.

> -
> - ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
> - "without PCRE library \"xslt_enable\" won't work ");
> -
> - return NGX_CONF_ERROR;
> - #endif
> - }
>
> static ngx_int_t
> ngx_http_xslt_header_filter(ngx_http_request_t *r)
> {
> ngx_http_xslt_filter_ctx_t *ctx;
> ngx_http_xslt_filter_loc_conf_t *conf;
> !
> ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
> "xslt filter header");
>
> --- 203,215 ----
> 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_xslt_header_filter(ngx_http_request_t *r)
> {
> ngx_http_xslt_filter_ctx_t *ctx;
> ngx_http_xslt_filter_loc_conf_t *conf;
> !
> ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
> "xslt filter header");
>
> ***************
> *** 299,318 ****
> return ngx_http_next_header_filter(r);
> }
>
> - #if (NGX_PCRE)
> -
> - if (conf->xslt_enable && r->headers_in.user_agent) {
> -
> - if (ngx_regex_exec_array(conf->xslt_enable,
> - &r->headers_in.user_agent->value,
> - r->connection->log)
> - == NGX_DECLINED)
> - {
> - return ngx_http_next_header_filter(r);
> - }
> - }
> -
> - #endif
> ctx = ngx_http_get_module_ctx(r, ngx_http_xslt_filter_module);
>
> if (ctx) {
> --- 225,230 ----

Maxim Dounin

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Subject Author Views Posted

Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent"

Maxim Dounin 2266 January 27, 2010 07:50AM

Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent"

tOmasEn 934 January 27, 2010 11:26AM

Re: Should I send patch here? - xslt_enable "only enable xslt transform for certain user agent" Attachments

tOmasEn 1211 January 27, 2010 12:14PM



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