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Limit zone: added the "limit_conn_zone" directive.

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It supersedes old "limit_zone" directive (deprecated accordingly) and uses
syntax consistent with the "limit_req_zone" directive.
This commit is contained in:
Valentin Bartenev 2011-11-10 16:25:08 +00:00
parent aaf5a5772f
commit 1dbd331849
1 changed files with 132 additions and 3 deletions
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135
src/http/modules/ngx_http_limit_zone_module.c
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@ -50,6 +50,8 @@ static ngx_inline void ngx_http_limit_zone_cleanup_all(ngx_pool_t *pool);
static void *ngx_http_limit_zone_create_conf(ngx_conf_t *cf);
static char *ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent,
void *child);
static char *ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd,
@ -57,6 +59,11 @@ static char *ngx_http_limit_conn(ngx_conf_t *cf, ngx_command_t *cmd,
static ngx_int_t ngx_http_limit_zone_init(ngx_conf_t *cf);
static ngx_conf_deprecated_t ngx_conf_deprecated_limit_zone = {
ngx_conf_deprecated, "limit_zone", "limit_conn_zone"
};
static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = {
{ ngx_string("info"), NGX_LOG_INFO },
{ ngx_string("notice"), NGX_LOG_NOTICE },
@ -68,6 +75,13 @@ static ngx_conf_enum_t ngx_http_limit_conn_log_levels[] = {
static ngx_command_t ngx_http_limit_zone_commands[] = {
{ ngx_string("limit_conn_zone"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE2,
ngx_http_limit_conn_zone,
0,
0,
NULL },
{ ngx_string("limit_zone"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
ngx_http_limit_zone,
@ -392,7 +406,7 @@ ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data)
if (octx) {
if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
"limit_zone \"%V\" uses the \"%V\" variable "
"limit_conn_zone \"%V\" uses the \"%V\" variable "
"while previously it used the \"%V\" variable",
&shm_zone->shm.name, &ctx->var, &octx->var);
return NGX_ERROR;
@ -426,14 +440,14 @@ ngx_http_limit_zone_init_zone(ngx_shm_zone_t *shm_zone, void *data)
ngx_rbtree_init(ctx->rbtree, sentinel,
ngx_http_limit_zone_rbtree_insert_value);
len = sizeof(" in limit_zone \"\"") + shm_zone->shm.name.len;
len = sizeof(" in limit_conn_zone \"\"") + shm_zone->shm.name.len;
shpool->log_ctx = ngx_slab_alloc(shpool, len);
if (shpool->log_ctx == NULL) {
return NGX_ERROR;
}
ngx_sprintf(shpool->log_ctx, " in limit_zone \"%V\"%Z",
ngx_sprintf(shpool->log_ctx, " in limit_conn_zone \"%V\"%Z",
&shm_zone->shm.name);
return NGX_OK;
@ -478,6 +492,119 @@ ngx_http_limit_zone_merge_conf(ngx_conf_t *cf, void *parent, void *child)
}
static char *
ngx_http_limit_conn_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
u_char *p;
ssize_t size;
ngx_str_t *value, name, s;
ngx_uint_t i;
ngx_shm_zone_t *shm_zone;
ngx_http_limit_zone_ctx_t *ctx;
value = cf->args->elts;
ctx = NULL;
size = 0;
name.len = 0;
for (i = 1; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
name.data = value[i].data + 5;
p = (u_char *) ngx_strchr(name.data, ':');
if (p == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid zone size \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
name.len = p - name.data;
s.data = p + 1;
s.len = value[i].data + value[i].len - s.data;
size = ngx_parse_size(&s);
if (size == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid zone size \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (size < (ssize_t) (8 * ngx_pagesize)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"zone \"%V\" is too small", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (value[i].data[0] == '$') {
value[i].len--;
value[i].data++;
ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_zone_ctx_t));
if (ctx == NULL) {
return NGX_CONF_ERROR;
}
ctx->index = ngx_http_get_variable_index(cf, &value[i]);
if (ctx->index == NGX_ERROR) {
return NGX_CONF_ERROR;
}
ctx->var = value[i];
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (name.len == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%V\" must have \"zone\" parameter",
&cmd->name);
return NGX_CONF_ERROR;
}
if (ctx == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"no variable is defined for %V \"%V\"",
&cmd->name, &name);
return NGX_CONF_ERROR;
}
shm_zone = ngx_shared_memory_add(cf, &name, size,
&ngx_http_limit_zone_module);
if (shm_zone == NULL) {
return NGX_CONF_ERROR;
}
if (shm_zone->data) {
ctx = shm_zone->data;
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"%V \"%V\" is already bound to variable \"%V\"",
&cmd->name, &name, &ctx->var);
return NGX_CONF_ERROR;
}
shm_zone->init = ngx_http_limit_zone_init_zone;
shm_zone->data = ctx;
return NGX_CONF_OK;
}
static char *
ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
@ -486,6 +613,8 @@ ngx_http_limit_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
ngx_shm_zone_t *shm_zone;
ngx_http_limit_zone_ctx_t *ctx;
ngx_conf_deprecated(cf, &ngx_conf_deprecated_limit_zone, NULL);
value = cf->args->elts;
if (value[2].data[0] != '$') {