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Limit req: support for multiple "limit_req" limits.

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This commit is contained in:
Valentin Bartenev 2012-01-30 10:17:56 +00:00
parent 73d0b6a721
commit b06200f3dc
1 changed files with 238 additions and 87 deletions
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255
src/http/modules/ngx_http_limit_req_module.c
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@ -18,6 +18,7 @@ typedef struct {
ngx_msec_t last; ngx_msec_t last;
/* integer value, 1 corresponds to 0.001 r/s */ /* integer value, 1 corresponds to 0.001 r/s */
ngx_uint_t excess; ngx_uint_t excess;
ngx_uint_t count;
u_char data[1]; u_char data[1];
} ngx_http_limit_req_node_t; } ngx_http_limit_req_node_t;
@ -36,6 +37,7 @@ typedef struct {
ngx_uint_t rate; ngx_uint_t rate;
ngx_int_t index; ngx_int_t index;
ngx_str_t var; ngx_str_t var;
ngx_http_limit_req_node_t *node;
} ngx_http_limit_req_ctx_t; } ngx_http_limit_req_ctx_t;
@ -43,16 +45,23 @@ typedef struct {
ngx_shm_zone_t *shm_zone; ngx_shm_zone_t *shm_zone;
/* integer value, 1 corresponds to 0.001 r/s */ /* integer value, 1 corresponds to 0.001 r/s */
ngx_uint_t burst; ngx_uint_t burst;
ngx_uint_t nodelay; /* unsigned nodelay:1 */
} ngx_http_limit_req_limit_t;
typedef struct {
ngx_array_t limits;
ngx_uint_t limit_log_level; ngx_uint_t limit_log_level;
ngx_uint_t delay_log_level; ngx_uint_t delay_log_level;
ngx_uint_t nodelay; /* unsigned nodelay:1 */
} ngx_http_limit_req_conf_t; } ngx_http_limit_req_conf_t;
static void ngx_http_limit_req_delay(ngx_http_request_t *r); static void ngx_http_limit_req_delay(ngx_http_request_t *r);
static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit,
ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep); ngx_uint_t hash, u_char *data, size_t len, ngx_uint_t *ep,
ngx_uint_t account);
static ngx_msec_t ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits,
ngx_uint_t n, ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit);
static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
ngx_uint_t n); ngx_uint_t n);
@ -139,33 +148,40 @@ ngx_http_limit_req_handler(ngx_http_request_t *r)
size_t len; size_t len;
uint32_t hash; uint32_t hash;
ngx_int_t rc; ngx_int_t rc;
ngx_uint_t excess; ngx_uint_t n, excess;
ngx_msec_t delay;
ngx_http_variable_value_t *vv; ngx_http_variable_value_t *vv;
ngx_http_limit_req_ctx_t *ctx; ngx_http_limit_req_ctx_t *ctx;
ngx_http_limit_req_conf_t *lrcf; ngx_http_limit_req_conf_t *lrcf;
ngx_http_limit_req_limit_t *limit, *limits;
if (r->main->limit_req_set) { if (r->main->limit_req_set) {
return NGX_DECLINED; return NGX_DECLINED;
} }
lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module); lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
limits = lrcf->limits.elts;
if (lrcf->shm_zone == NULL) { excess = 0;
return NGX_DECLINED;
}
ctx = lrcf->shm_zone->data; rc = NGX_DECLINED;
for (n = 0; n < lrcf->limits.nelts; n++) {
limit = &limits[n];
ctx = limit->shm_zone->data;
vv = ngx_http_get_indexed_variable(r, ctx->index); vv = ngx_http_get_indexed_variable(r, ctx->index);
if (vv == NULL || vv->not_found) { if (vv == NULL || vv->not_found) {
return NGX_DECLINED; continue;
} }
len = vv->len; len = vv->len;
if (len == 0) { if (len == 0) {
return NGX_DECLINED; continue;
} }
if (len > 65535) { if (len > 65535) {
@ -173,47 +189,76 @@ ngx_http_limit_req_handler(ngx_http_request_t *r)
"the value of the \"%V\" variable " "the value of the \"%V\" variable "
"is more than 65535 bytes: \"%v\"", "is more than 65535 bytes: \"%v\"",
&ctx->var, vv); &ctx->var, vv);
return NGX_DECLINED; continue;
} }
r->main->limit_req_set = 1;
hash = ngx_crc32_short(vv->data, len); hash = ngx_crc32_short(vv->data, len);
ngx_shmtx_lock(&ctx->shpool->mutex); ngx_shmtx_lock(&ctx->shpool->mutex);
rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &excess); rc = ngx_http_limit_req_lookup(limit, hash, vv->data, len, &excess,
(n == lrcf->limits.nelts - 1));
ngx_shmtx_unlock(&ctx->shpool->mutex); ngx_shmtx_unlock(&ctx->shpool->mutex);
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000); "limit_req[%ui]: %i %ui.%03ui",
n, rc, excess / 1000, excess % 1000);
if (rc == NGX_OK) { if (rc != NGX_AGAIN) {
break;
}
}
if (rc == NGX_DECLINED) {
return NGX_DECLINED; return NGX_DECLINED;
} }
r->main->limit_req_set = 1;
if (rc == NGX_BUSY || rc == NGX_ERROR) { if (rc == NGX_BUSY || rc == NGX_ERROR) {
if (rc == NGX_BUSY) { if (rc == NGX_BUSY) {
ngx_log_error(lrcf->limit_log_level, r->connection->log, 0, ngx_log_error(lrcf->limit_log_level, r->connection->log, 0,
"limiting requests, excess: %ui.%03ui by zone \"%V\"", "limiting requests, excess: %ui.%03ui by zone \"%V\"",
excess / 1000, excess % 1000, excess / 1000, excess % 1000,
&lrcf->shm_zone->shm.name); &limit->shm_zone->shm.name);
}
while (n--) {
ctx = limits[n].shm_zone->data;
if (ctx->node == NULL) {
continue;
}
ngx_shmtx_lock(&ctx->shpool->mutex);
ctx->node->count--;
ngx_shmtx_unlock(&ctx->shpool->mutex);
ctx->node = NULL;
} }
return NGX_HTTP_SERVICE_UNAVAILABLE; return NGX_HTTP_SERVICE_UNAVAILABLE;
} }
/* rc == NGX_AGAIN */ /* rc == NGX_AGAIN || rc == NGX_OK */
if (lrcf->nodelay) { if (rc == NGX_AGAIN) {
excess = 0;
}
delay = ngx_http_limit_req_account(limits, n, &excess, &limit);
if (!delay) {
return NGX_DECLINED; return NGX_DECLINED;
} }
ngx_log_error(lrcf->delay_log_level, r->connection->log, 0, ngx_log_error(lrcf->delay_log_level, r->connection->log, 0,
"delaying request, excess: %ui.%03ui, by zone \"%V\"", "delaying request, excess: %ui.%03ui, by zone \"%V\"",
excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name); excess / 1000, excess % 1000, &limit->shm_zone->shm.name);
if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) { if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
return NGX_HTTP_INTERNAL_SERVER_ERROR; return NGX_HTTP_INTERNAL_SERVER_ERROR;
@ -221,8 +266,7 @@ ngx_http_limit_req_handler(ngx_http_request_t *r)
r->read_event_handler = ngx_http_test_reading; r->read_event_handler = ngx_http_test_reading;
r->write_event_handler = ngx_http_limit_req_delay; r->write_event_handler = ngx_http_limit_req_delay;
ngx_add_timer(r->connection->write, ngx_add_timer(r->connection->write, delay);
(ngx_msec_t) excess * 1000 / ctx->rate);
return NGX_AGAIN; return NGX_AGAIN;
} }
@ -303,8 +347,8 @@ ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
static ngx_int_t static ngx_int_t
ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash, ngx_http_limit_req_lookup(ngx_http_limit_req_limit_t *limit, ngx_uint_t hash,
u_char *data, size_t len, ngx_uint_t *ep) u_char *data, size_t len, ngx_uint_t *ep, ngx_uint_t account)
{ {
size_t size; size_t size;
ngx_int_t rc, excess; ngx_int_t rc, excess;
@ -318,7 +362,7 @@ ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
tp = ngx_timeofday(); tp = ngx_timeofday();
now = (ngx_msec_t) (tp->sec * 1000 + tp->msec); now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
ctx = lrcf->shm_zone->data; ctx = limit->shm_zone->data;
node = ctx->sh->rbtree.root; node = ctx->sh->rbtree.root;
sentinel = ctx->sh->rbtree.sentinel; sentinel = ctx->sh->rbtree.sentinel;
@ -356,18 +400,21 @@ ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
*ep = excess; *ep = excess;
if ((ngx_uint_t) excess > lrcf->burst) { if ((ngx_uint_t) excess > limit->burst) {
return NGX_BUSY; return NGX_BUSY;
} }
if (account) {
lr->excess = excess; lr->excess = excess;
lr->last = now; lr->last = now;
return NGX_OK;
if (excess) {
return NGX_AGAIN;
} }
return NGX_OK; lr->count++;
ctx->node = lr;
return NGX_AGAIN;
} }
node = (rc < 0) ? node->left : node->right; node = (rc < 0) ? node->left : node->right;
@ -406,13 +453,90 @@ ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
lr->len = (u_char) len; lr->len = (u_char) len;
lr->excess = 0; lr->excess = 0;
lr->last = now;
ngx_memcpy(lr->data, data, len); ngx_memcpy(lr->data, data, len);
if (account) {
lr->last = now;
lr->count = 0;
return NGX_OK; return NGX_OK;
} }
lr->last = 0;
lr->count = 1;
ctx->node = lr;
return NGX_AGAIN;
}
static ngx_msec_t
ngx_http_limit_req_account(ngx_http_limit_req_limit_t *limits, ngx_uint_t n,
ngx_uint_t *ep, ngx_http_limit_req_limit_t **limit)
{
ngx_int_t excess;
ngx_time_t *tp;
ngx_msec_t now, delay, max_delay;
ngx_msec_int_t ms;
ngx_http_limit_req_ctx_t *ctx;
ngx_http_limit_req_node_t *lr;
excess = *ep;
if (excess == 0 || (*limit)->nodelay) {
max_delay = 0;
} else {
ctx = (*limit)->shm_zone->data;
max_delay = excess * 1000 / ctx->rate;
}
while (n--) {
ctx = limits[n].shm_zone->data;
lr = ctx->node;
if (lr == NULL) {
continue;
}
ngx_shmtx_lock(&ctx->shpool->mutex);
tp = ngx_timeofday();
now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
ms = (ngx_msec_int_t) (now - lr->last);
excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
if (excess < 0) {
excess = 0;
}
lr->last = now;
lr->excess = excess;
lr->count--;
ngx_shmtx_unlock(&ctx->shpool->mutex);
ctx->node = NULL;
if (limits[n].nodelay) {
continue;
}
delay = excess * 1000 / ctx->rate;
if (delay > max_delay) {
max_delay = delay;
*ep = excess;
*limit = &limits[n];
}
}
return max_delay;
}
static void static void
ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n) ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
@ -445,6 +569,16 @@ ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue); lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
if (lr->count) {
/*
* There is not much sense in looking further,
* because we bump nodes on the lookup stage.
*/
return;
}
if (n++ != 0) { if (n++ != 0) {
ms = (ngx_msec_int_t) (now - lr->last); ms = (ngx_msec_int_t) (now - lr->last);
@ -545,9 +679,7 @@ ngx_http_limit_req_create_conf(ngx_conf_t *cf)
/* /*
* set by ngx_pcalloc(): * set by ngx_pcalloc():
* *
* conf->shm_zone = NULL; * conf->limits.elts = NULL;
* conf->burst = 0;
* conf->nodelay = 0;
*/ */
conf->limit_log_level = NGX_CONF_UNSET_UINT; conf->limit_log_level = NGX_CONF_UNSET_UINT;
@ -562,10 +694,8 @@ ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
ngx_http_limit_req_conf_t *prev = parent; ngx_http_limit_req_conf_t *prev = parent;
ngx_http_limit_req_conf_t *conf = child; ngx_http_limit_req_conf_t *conf = child;
if (conf->shm_zone == NULL) { if (conf->limits.elts == NULL) {
conf->shm_zone = prev->shm_zone; conf->limits = prev->limits;
conf->burst = prev->burst;
conf->nodelay = prev->nodelay;
} }
ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level, ngx_conf_merge_uint_value(conf->limit_log_level, prev->limit_log_level,
@ -728,15 +858,15 @@ ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
ngx_int_t burst; ngx_int_t burst;
ngx_str_t *value, s; ngx_str_t *value, s;
ngx_uint_t i; ngx_uint_t i, nodelay;
ngx_shm_zone_t *shm_zone;
if (lrcf->shm_zone) { ngx_http_limit_req_limit_t *limit, *limits;
return "is duplicate";
}
value = cf->args->elts; value = cf->args->elts;
shm_zone = NULL;
burst = 0; burst = 0;
nodelay = 0;
for (i = 1; i < cf->args->nelts; i++) { for (i = 1; i < cf->args->nelts; i++) {
@ -745,9 +875,9 @@ ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
s.len = value[i].len - 5; s.len = value[i].len - 5;
s.data = value[i].data + 5; s.data = value[i].data + 5;
lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0, shm_zone = ngx_shared_memory_add(cf, &s, 0,
&ngx_http_limit_req_module); &ngx_http_limit_req_module);
if (lrcf->shm_zone == NULL) { if (shm_zone == NULL) {
return NGX_CONF_ERROR; return NGX_CONF_ERROR;
} }
@ -767,7 +897,7 @@ ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
} }
if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) { if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
lrcf->nodelay = 1; nodelay = 1;
continue; continue;
} }
@ -776,21 +906,42 @@ ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
return NGX_CONF_ERROR; return NGX_CONF_ERROR;
} }
if (lrcf->shm_zone == NULL) { if (shm_zone == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%V\" must have \"zone\" parameter", "\"%V\" must have \"zone\" parameter",
&cmd->name); &cmd->name);
return NGX_CONF_ERROR; return NGX_CONF_ERROR;
} }
if (lrcf->shm_zone->data == NULL) { if (shm_zone->data == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"unknown limit_req_zone \"%V\"", "unknown limit_req_zone \"%V\"",
&lrcf->shm_zone->shm.name); &shm_zone->shm.name);
return NGX_CONF_ERROR; return NGX_CONF_ERROR;
} }
lrcf->burst = burst * 1000; limits = lrcf->limits.elts;
if (limits == NULL) {
if (ngx_array_init(&lrcf->limits, cf->pool, 1,
sizeof(ngx_http_limit_req_limit_t))
!= NGX_OK)
{
return NGX_CONF_ERROR;
}
}
for (i = 0; i < lrcf->limits.nelts; i++) {
if (shm_zone == limits[i].shm_zone) {
return "is duplicate";
}
}
limit = ngx_array_push(&lrcf->limits);
limit->shm_zone = shm_zone;
limit->burst = burst * 1000;
limit->nodelay = nodelay;
return NGX_CONF_OK; return NGX_CONF_OK;
} }