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Limit req: limit_req_dry_run directive.

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A new directive limit_req_dry_run allows enabling the dry run mode.  In this
mode requests are neither rejected nor delayed, but reject/delay status is
logged as usual.
This commit is contained in:
Roman Arutyunyan 2019-06-05 19:55:27 +03:00
parent 16ebfa999b
commit dda58fc63b
1 changed files with 25 additions and 4 deletions
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29
src/http/modules/ngx_http_limit_req_module.c
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@ -53,6 +53,7 @@ typedef struct {
ngx_uint_t limit_log_level;
ngx_uint_t delay_log_level;
ngx_uint_t status_code;
ngx_flag_t dry_run;
} ngx_http_limit_req_conf_t;
@ -118,6 +119,13 @@ static ngx_command_t ngx_http_limit_req_commands[] = {
offsetof(ngx_http_limit_req_conf_t, status_code),
&ngx_http_limit_req_status_bounds },
{ ngx_string("limit_req_dry_run"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_limit_req_conf_t, dry_run),
NULL },
ngx_null_command
};
@ -230,9 +238,10 @@ ngx_http_limit_req_handler(ngx_http_request_t *r)
if (rc == NGX_BUSY) {
ngx_log_error(lrcf->limit_log_level, r->connection->log, 0,
"limiting requests, excess: %ui.%03ui by zone \"%V\"",
excess / 1000, excess % 1000,
&limit->shm_zone->shm.name);
"limiting requests%s, excess: %ui.%03ui by zone \"%V\"",
lrcf->dry_run ? ", dry run" : "",
excess / 1000, excess % 1000,
&limit->shm_zone->shm.name);
}
while (n--) {
@ -251,6 +260,10 @@ ngx_http_limit_req_handler(ngx_http_request_t *r)
ctx->node = NULL;
}
if (lrcf->dry_run) {
return NGX_DECLINED;
}
return lrcf->status_code;
}
@ -267,9 +280,14 @@ ngx_http_limit_req_handler(ngx_http_request_t *r)
}
ngx_log_error(lrcf->delay_log_level, r->connection->log, 0,
"delaying request, excess: %ui.%03ui, by zone \"%V\"",
"delaying request%s, excess: %ui.%03ui, by zone \"%V\"",
lrcf->dry_run ? ", dry run" : "",
excess / 1000, excess % 1000, &limit->shm_zone->shm.name);
if (lrcf->dry_run) {
return NGX_DECLINED;
}
if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
@ -711,6 +729,7 @@ ngx_http_limit_req_create_conf(ngx_conf_t *cf)
conf->limit_log_level = NGX_CONF_UNSET_UINT;
conf->status_code = NGX_CONF_UNSET_UINT;
conf->dry_run = NGX_CONF_UNSET;
return conf;
}
@ -735,6 +754,8 @@ ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
ngx_conf_merge_uint_value(conf->status_code, prev->status_code,
NGX_HTTP_SERVICE_UNAVAILABLE);
ngx_conf_merge_value(conf->dry_run, prev->dry_run, 0);
return NGX_CONF_OK;
}