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Variables: generic prefix variables.

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This commit is contained in:
Dmitry Volyntsev 2017-01-31 21:19:58 +03:00
parent 7e080678d6
commit 897eaa9215
9 changed files with 267 additions and 163 deletions
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13
src/http/modules/ngx_http_rewrite_module.c
View File

@ -917,7 +917,8 @@ ngx_http_rewrite_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
value[1].len--;
value[1].data++;
v = ngx_http_add_variable(cf, &value[1], NGX_HTTP_VAR_CHANGEABLE);
v = ngx_http_add_variable(cf, &value[1],
NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_WEAK);
if (v == NULL) {
return NGX_CONF_ERROR;
}
@ -927,15 +928,7 @@ ngx_http_rewrite_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
return NGX_CONF_ERROR;
}
if (v->get_handler == NULL
&& ngx_strncasecmp(value[1].data, (u_char *) "http_", 5) != 0
&& ngx_strncasecmp(value[1].data, (u_char *) "sent_http_", 10) != 0
&& ngx_strncasecmp(value[1].data, (u_char *) "upstream_http_", 14) != 0
&& ngx_strncasecmp(value[1].data, (u_char *) "cookie_", 7) != 0
&& ngx_strncasecmp(value[1].data, (u_char *) "upstream_cookie_", 16)
!= 0
&& ngx_strncasecmp(value[1].data, (u_char *) "arg_", 4) != 0)
{
if (v->get_handler == NULL) {
v->get_handler = ngx_http_rewrite_var;
v->data = index;
}

3
src/http/ngx_http_core_module.h
View File

@ -158,7 +158,8 @@ typedef struct {
ngx_hash_t variables_hash;
ngx_array_t variables; /* ngx_http_variable_t */
ngx_array_t variables; /* ngx_http_variable_t */
ngx_array_t prefix_variables; /* ngx_http_variable_t */
ngx_uint_t ncaptures;
ngx_uint_t server_names_hash_max_size;

14
src/http/ngx_http_upstream.c
View File

@ -162,6 +162,10 @@ static ngx_int_t ngx_http_upstream_response_time_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_response_length_variable(
ngx_http_request_t *r, ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static ngx_int_t ngx_http_upstream_cookie_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static char *ngx_http_upstream(ngx_conf_t *cf, ngx_command_t *cmd, void *dummy);
static char *ngx_http_upstream_server(ngx_conf_t *cf, ngx_command_t *cmd,
@ -413,6 +417,12 @@ static ngx_http_variable_t ngx_http_upstream_vars[] = {
#endif
{ ngx_string("upstream_http_"), NULL, ngx_http_upstream_header_variable,
0, NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("upstream_cookie_"), NULL, ngx_http_upstream_cookie_variable,
0, NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_null_string, NULL, NULL, 0, 0, 0 }
};
@ -5391,7 +5401,7 @@ ngx_http_upstream_response_length_variable(ngx_http_request_t *r,
}
ngx_int_t
static ngx_int_t
ngx_http_upstream_header_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{
@ -5406,7 +5416,7 @@ ngx_http_upstream_header_variable(ngx_http_request_t *r,
}
ngx_int_t
static ngx_int_t
ngx_http_upstream_cookie_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data)
{

5
src/http/ngx_http_upstream.h
View File

@ -402,11 +402,6 @@ typedef struct {
} ngx_http_upstream_param_t;
ngx_int_t ngx_http_upstream_cookie_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
ngx_int_t ngx_http_upstream_create(ngx_http_request_t *r);
void ngx_http_upstream_init(ngx_http_request_t *r);
ngx_http_upstream_srv_conf_t *ngx_http_upstream_add(ngx_conf_t *cf,

242
src/http/ngx_http_variables.c
View File

@ -11,6 +11,9 @@
#include <nginx.h>
static ngx_http_variable_t *ngx_http_add_prefix_variable(ngx_conf_t *cf,
ngx_str_t *name, ngx_uint_t flags);
static ngx_int_t ngx_http_variable_request(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
#if 0
@ -356,6 +359,18 @@ static ngx_http_variable_t ngx_http_core_variables[] = {
3, NGX_HTTP_VAR_NOCACHEABLE, 0 },
#endif
{ ngx_string("http_"), NULL, ngx_http_variable_unknown_header_in,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("sent_http_"), NULL, ngx_http_variable_unknown_header_out,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("cookie_"), NULL, ngx_http_variable_cookie,
0, NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_string("arg_"), NULL, ngx_http_variable_argument,
0, NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_PREFIX, 0 },
{ ngx_null_string, NULL, NULL, 0, 0, 0 }
};
@ -384,6 +399,10 @@ ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
return NULL;
}
if (flags & NGX_HTTP_VAR_PREFIX) {
return ngx_http_add_prefix_variable(cf, name, flags);
}
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
key = cmcf->variables_keys->keys.elts;
@ -402,6 +421,8 @@ ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
return NULL;
}
v->flags &= flags | ~NGX_HTTP_VAR_WEAK;
return v;
}
@ -440,6 +461,59 @@ ngx_http_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
}
static ngx_http_variable_t *
ngx_http_add_prefix_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
{
ngx_uint_t i;
ngx_http_variable_t *v;
ngx_http_core_main_conf_t *cmcf;
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
v = cmcf->prefix_variables.elts;
for (i = 0; i < cmcf->prefix_variables.nelts; i++) {
if (name->len != v[i].name.len
|| ngx_strncasecmp(name->data, v[i].name.data, name->len) != 0)
{
continue;
}
v = &v[i];
if (!(v->flags & NGX_HTTP_VAR_CHANGEABLE)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the duplicate \"%V\" variable", name);
return NULL;
}
v->flags &= flags | ~NGX_HTTP_VAR_WEAK;
return v;
}
v = ngx_array_push(&cmcf->prefix_variables);
if (v == NULL) {
return NULL;
}
v->name.len = name->len;
v->name.data = ngx_pnalloc(cf->pool, name->len);
if (v->name.data == NULL) {
return NULL;
}
ngx_strlow(v->name.data, name->data, name->len);
v->set_handler = NULL;
v->get_handler = NULL;
v->data = 0;
v->flags = flags;
v->index = 0;
return v;
}
ngx_int_t
ngx_http_get_variable_index(ngx_conf_t *cf, ngx_str_t *name)
{
@ -573,6 +647,8 @@ ngx_http_get_flushed_variable(ngx_http_request_t *r, ngx_uint_t index)
ngx_http_variable_value_t *
ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name, ngx_uint_t key)
{
size_t len;
ngx_uint_t i, n;
ngx_http_variable_t *v;
ngx_http_variable_value_t *vv;
ngx_http_core_main_conf_t *cmcf;
@ -610,64 +686,22 @@ ngx_http_get_variable(ngx_http_request_t *r, ngx_str_t *name, ngx_uint_t key)
return NULL;
}
if (name->len >= 5 && ngx_strncmp(name->data, "http_", 5) == 0) {
len = 0;
if (ngx_http_variable_unknown_header_in(r, vv, (uintptr_t) name)
== NGX_OK)
v = cmcf->prefix_variables.elts;
n = cmcf->prefix_variables.nelts;
for (i = 0; i < cmcf->prefix_variables.nelts; i++) {
if (name->len >= v[i].name.len && name->len > len
&& ngx_strncmp(name->data, v[i].name.data, v[i].name.len) == 0)
{
return vv;
len = v[i].name.len;
n = i;
}
return NULL;
}
if (name->len >= 10 && ngx_strncmp(name->data, "sent_http_", 10) == 0) {
if (ngx_http_variable_unknown_header_out(r, vv, (uintptr_t) name)
== NGX_OK)
{
return vv;
}
return NULL;
}
if (name->len >= 14 && ngx_strncmp(name->data, "upstream_http_", 14) == 0) {
if (ngx_http_upstream_header_variable(r, vv, (uintptr_t) name)
== NGX_OK)
{
return vv;
}
return NULL;
}
if (name->len >= 7 && ngx_strncmp(name->data, "cookie_", 7) == 0) {
if (ngx_http_variable_cookie(r, vv, (uintptr_t) name) == NGX_OK) {
return vv;
}
return NULL;
}
if (name->len >= 16
&& ngx_strncmp(name->data, "upstream_cookie_", 16) == 0)
{
if (ngx_http_upstream_cookie_variable(r, vv, (uintptr_t) name)
== NGX_OK)
{
return vv;
}
return NULL;
}
if (name->len >= 4 && ngx_strncmp(name->data, "arg_", 4) == 0) {
if (ngx_http_variable_argument(r, vv, (uintptr_t) name) == NGX_OK) {
if (n != cmcf->prefix_variables.nelts) {
if (v[n].get_handler(r, vv, (uintptr_t) name) == NGX_OK) {
return vv;
}
@ -2502,7 +2536,6 @@ ngx_http_regex_exec(ngx_http_request_t *r, ngx_http_regex_t *re, ngx_str_t *s)
ngx_int_t
ngx_http_variables_add_core_vars(ngx_conf_t *cf)
{
ngx_int_t rc;
ngx_http_variable_t *cv, *v;
ngx_http_core_main_conf_t *cmcf;
@ -2523,27 +2556,20 @@ ngx_http_variables_add_core_vars(ngx_conf_t *cf)
return NGX_ERROR;
}
if (ngx_array_init(&cmcf->prefix_variables, cf->pool, 8,
sizeof(ngx_http_variable_t))
!= NGX_OK)
{
return NGX_ERROR;
}
for (cv = ngx_http_core_variables; cv->name.len; cv++) {
v = ngx_palloc(cf->pool, sizeof(ngx_http_variable_t));
v = ngx_http_add_variable(cf, &cv->name, cv->flags);
if (v == NULL) {
return NGX_ERROR;
}
*v = *cv;
rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v,
NGX_HASH_READONLY_KEY);
if (rc == NGX_OK) {
continue;
}
if (rc == NGX_BUSY) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"conflicting variable name \"%V\"", &v->name);
}
return NGX_ERROR;
}
return NGX_OK;
@ -2553,10 +2579,11 @@ ngx_http_variables_add_core_vars(ngx_conf_t *cf)
ngx_int_t
ngx_http_variables_init_vars(ngx_conf_t *cf)
{
size_t len;
ngx_uint_t i, n;
ngx_hash_key_t *key;
ngx_hash_init_t hash;
ngx_http_variable_t *v, *av;
ngx_http_variable_t *v, *av, *pv;
ngx_http_core_main_conf_t *cmcf;
/* set the handlers for the indexed http variables */
@ -2564,6 +2591,7 @@ ngx_http_variables_init_vars(ngx_conf_t *cf)
cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
v = cmcf->variables.elts;
pv = cmcf->prefix_variables.elts;
key = cmcf->variables_keys->keys.elts;
for (i = 0; i < cmcf->variables.nelts; i++) {
@ -2584,7 +2612,9 @@ ngx_http_variables_init_vars(ngx_conf_t *cf)
av->index = i;
if (av->get_handler == NULL) {
if (av->get_handler == NULL
|| (av->flags & NGX_HTTP_VAR_WEAK))
{
break;
}
@ -2592,68 +2622,34 @@ ngx_http_variables_init_vars(ngx_conf_t *cf)
}
}
if (v[i].name.len >= 5
&& ngx_strncmp(v[i].name.data, "http_", 5) == 0)
{
v[i].get_handler = ngx_http_variable_unknown_header_in;
v[i].data = (uintptr_t) &v[i].name;
len = 0;
av = NULL;
continue;
for (n = 0; n < cmcf->prefix_variables.nelts; n++) {
if (v[i].name.len >= pv[n].name.len && v[i].name.len > len
&& ngx_strncmp(v[i].name.data, pv[n].name.data, pv[n].name.len)
== 0)
{
av = &pv[n];
len = pv[n].name.len;
}
}
if (v[i].name.len >= 10
&& ngx_strncmp(v[i].name.data, "sent_http_", 10) == 0)
{
v[i].get_handler = ngx_http_variable_unknown_header_out;
if (av) {
v[i].get_handler = av->get_handler;
v[i].data = (uintptr_t) &v[i].name;
v[i].flags = av->flags;
continue;
goto next;
}
if (v[i].name.len >= 14
&& ngx_strncmp(v[i].name.data, "upstream_http_", 14) == 0)
{
v[i].get_handler = ngx_http_upstream_header_variable;
v[i].data = (uintptr_t) &v[i].name;
v[i].flags = NGX_HTTP_VAR_NOCACHEABLE;
if (v[i].get_handler == NULL) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"unknown \"%V\" variable", &v[i].name);
continue;
return NGX_ERROR;
}
if (v[i].name.len >= 7
&& ngx_strncmp(v[i].name.data, "cookie_", 7) == 0)
{
v[i].get_handler = ngx_http_variable_cookie;
v[i].data = (uintptr_t) &v[i].name;
continue;
}
if (v[i].name.len >= 16
&& ngx_strncmp(v[i].name.data, "upstream_cookie_", 16) == 0)
{
v[i].get_handler = ngx_http_upstream_cookie_variable;
v[i].data = (uintptr_t) &v[i].name;
v[i].flags = NGX_HTTP_VAR_NOCACHEABLE;
continue;
}
if (v[i].name.len >= 4
&& ngx_strncmp(v[i].name.data, "arg_", 4) == 0)
{
v[i].get_handler = ngx_http_variable_argument;
v[i].data = (uintptr_t) &v[i].name;
v[i].flags = NGX_HTTP_VAR_NOCACHEABLE;
continue;
}
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"unknown \"%V\" variable", &v[i].name);
return NGX_ERROR;
next:
continue;
}

2
src/http/ngx_http_variables.h
View File

@ -30,6 +30,8 @@ typedef ngx_int_t (*ngx_http_get_variable_pt) (ngx_http_request_t *r,
#define NGX_HTTP_VAR_NOCACHEABLE 2
#define NGX_HTTP_VAR_INDEXED 4
#define NGX_HTTP_VAR_NOHASH 8
#define NGX_HTTP_VAR_WEAK 16
#define NGX_HTTP_VAR_PREFIX 32
struct ngx_http_variable_s {

3
src/stream/ngx_stream.h
View File

@ -153,7 +153,8 @@ typedef struct {
ngx_hash_t variables_hash;
ngx_array_t variables; /* ngx_stream_variable_t */
ngx_array_t variables; /* ngx_stream_variable_t */
ngx_array_t prefix_variables; /* ngx_stream_variable_t */
ngx_uint_t ncaptures;
ngx_uint_t variables_hash_max_size;

146
src/stream/ngx_stream_variables.c
View File

@ -10,6 +10,8 @@
#include <ngx_stream.h>
#include <nginx.h>
static ngx_stream_variable_t *ngx_stream_add_prefix_variable(ngx_conf_t *cf,
ngx_str_t *name, ngx_uint_t flags);
static ngx_int_t ngx_stream_variable_binary_remote_addr(
ngx_stream_session_t *s, ngx_stream_variable_value_t *v, uintptr_t data);
@ -137,6 +139,10 @@ ngx_stream_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
return NULL;
}
if (flags & NGX_STREAM_VAR_PREFIX) {
return ngx_stream_add_prefix_variable(cf, name, flags);
}
cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
key = cmcf->variables_keys->keys.elts;
@ -155,6 +161,8 @@ ngx_stream_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
return NULL;
}
v->flags &= flags | ~NGX_STREAM_VAR_WEAK;
return v;
}
@ -193,6 +201,60 @@ ngx_stream_add_variable(ngx_conf_t *cf, ngx_str_t *name, ngx_uint_t flags)
}
static ngx_stream_variable_t *
ngx_stream_add_prefix_variable(ngx_conf_t *cf, ngx_str_t *name,
ngx_uint_t flags)
{
ngx_uint_t i;
ngx_stream_variable_t *v;
ngx_stream_core_main_conf_t *cmcf;
cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
v = cmcf->prefix_variables.elts;
for (i = 0; i < cmcf->prefix_variables.nelts; i++) {
if (name->len != v[i].name.len
|| ngx_strncasecmp(name->data, v[i].name.data, name->len) != 0)
{
continue;
}
v = &v[i];
if (!(v->flags & NGX_STREAM_VAR_CHANGEABLE)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"the duplicate \"%V\" variable", name);
return NULL;
}
v->flags &= flags | ~NGX_STREAM_VAR_WEAK;
return v;
}
v = ngx_array_push(&cmcf->prefix_variables);
if (v == NULL) {
return NULL;
}
v->name.len = name->len;
v->name.data = ngx_pnalloc(cf->pool, name->len);
if (v->name.data == NULL) {
return NULL;
}
ngx_strlow(v->name.data, name->data, name->len);
v->set_handler = NULL;
v->get_handler = NULL;
v->data = 0;
v->flags = flags;
v->index = 0;
return v;
}
ngx_int_t
ngx_stream_get_variable_index(ngx_conf_t *cf, ngx_str_t *name)
{
@ -327,6 +389,8 @@ ngx_stream_variable_value_t *
ngx_stream_get_variable(ngx_stream_session_t *s, ngx_str_t *name,
ngx_uint_t key)
{
size_t len;
ngx_uint_t i, n;
ngx_stream_variable_t *v;
ngx_stream_variable_value_t *vv;
ngx_stream_core_main_conf_t *cmcf;
@ -365,6 +429,28 @@ ngx_stream_get_variable(ngx_stream_session_t *s, ngx_str_t *name,
return NULL;
}
len = 0;
v = cmcf->prefix_variables.elts;
n = cmcf->prefix_variables.nelts;
for (i = 0; i < cmcf->prefix_variables.nelts; i++) {
if (name->len >= v[i].name.len && name->len > len
&& ngx_strncmp(name->data, v[i].name.data, v[i].name.len) == 0)
{
len = v[i].name.len;
n = i;
}
}
if (n != cmcf->prefix_variables.nelts) {
if (v[n].get_handler(s, vv, (uintptr_t) name) == NGX_OK) {
return vv;
}
return NULL;
}
vv->not_found = 1;
return vv;
@ -1000,7 +1086,6 @@ ngx_stream_regex_exec(ngx_stream_session_t *s, ngx_stream_regex_t *re,
ngx_int_t
ngx_stream_variables_add_core_vars(ngx_conf_t *cf)
{
ngx_int_t rc;
ngx_stream_variable_t *cv, *v;
ngx_stream_core_main_conf_t *cmcf;
@ -1021,27 +1106,20 @@ ngx_stream_variables_add_core_vars(ngx_conf_t *cf)
return NGX_ERROR;
}
if (ngx_array_init(&cmcf->prefix_variables, cf->pool, 8,
sizeof(ngx_stream_variable_t))
!= NGX_OK)
{
return NGX_ERROR;
}
for (cv = ngx_stream_core_variables; cv->name.len; cv++) {
v = ngx_palloc(cf->pool, sizeof(ngx_stream_variable_t));
v = ngx_stream_add_variable(cf, &cv->name, cv->flags);
if (v == NULL) {
return NGX_ERROR;
}
*v = *cv;
rc = ngx_hash_add_key(cmcf->variables_keys, &v->name, v,
NGX_HASH_READONLY_KEY);
if (rc == NGX_OK) {
continue;
}
if (rc == NGX_BUSY) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"conflicting variable name \"%V\"", &v->name);
}
return NGX_ERROR;
}
return NGX_OK;
@ -1051,10 +1129,11 @@ ngx_stream_variables_add_core_vars(ngx_conf_t *cf)
ngx_int_t
ngx_stream_variables_init_vars(ngx_conf_t *cf)
{
size_t len;
ngx_uint_t i, n;
ngx_hash_key_t *key;
ngx_hash_init_t hash;
ngx_stream_variable_t *v, *av;
ngx_stream_variable_t *v, *av, *pv;
ngx_stream_core_main_conf_t *cmcf;
/* set the handlers for the indexed stream variables */
@ -1062,6 +1141,7 @@ ngx_stream_variables_init_vars(ngx_conf_t *cf)
cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
v = cmcf->variables.elts;
pv = cmcf->prefix_variables.elts;
key = cmcf->variables_keys->keys.elts;
for (i = 0; i < cmcf->variables.nelts; i++) {
@ -1082,7 +1162,9 @@ ngx_stream_variables_init_vars(ngx_conf_t *cf)
av->index = i;
if (av->get_handler == NULL) {
if (av->get_handler == NULL
|| (av->flags & NGX_STREAM_VAR_WEAK))
{
break;
}
@ -1090,10 +1172,32 @@ ngx_stream_variables_init_vars(ngx_conf_t *cf)
}
}
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"unknown \"%V\" variable", &v[i].name);
len = 0;
av = NULL;
return NGX_ERROR;
for (n = 0; n < cmcf->prefix_variables.nelts; n++) {
if (v[i].name.len >= pv[n].name.len && v[i].name.len > len
&& ngx_strncmp(v[i].name.data, pv[n].name.data, pv[n].name.len)
== 0)
{
av = &pv[n];
len = pv[n].name.len;
}
}
if (av) {
v[i].get_handler = av->get_handler;
v[i].data = (uintptr_t) &v[i].name;
v[i].flags = av->flags;
goto next;
}
if (v[i].get_handler == NULL) {
ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
"unknown \"%V\" variable", &v[i].name);
return NGX_ERROR;
}
next:
continue;

2
src/stream/ngx_stream_variables.h
View File

@ -30,6 +30,8 @@ typedef ngx_int_t (*ngx_stream_get_variable_pt) (ngx_stream_session_t *s,
#define NGX_STREAM_VAR_NOCACHEABLE 2
#define NGX_STREAM_VAR_INDEXED 4
#define NGX_STREAM_VAR_NOHASH 8
#define NGX_STREAM_VAR_WEAK 16
#define NGX_STREAM_VAR_PREFIX 32
struct ngx_stream_variable_s {