416
|
1
|
|
2 /*
|
|
3 * Copyright (C) Igor Sysoev
|
|
4 */
|
|
5
|
|
6
|
|
7 #include <ngx_config.h>
|
|
8 #include <ngx_core.h>
|
|
9 #include <ngx_http.h>
|
|
10
|
|
11
|
|
12 typedef struct {
|
480
|
13 u_char color;
|
|
14 u_char dummy;
|
|
15 u_short len;
|
|
16 ngx_queue_t queue;
|
|
17 ngx_msec_t last;
|
|
18 /* integer value, 1 corresponds to 0.001 r/s */
|
|
19 ngx_uint_t excess;
|
|
20 u_char data[1];
|
416
|
21 } ngx_http_limit_req_node_t;
|
|
22
|
|
23
|
|
24 typedef struct {
|
480
|
25 ngx_rbtree_t rbtree;
|
|
26 ngx_rbtree_node_t sentinel;
|
|
27 ngx_queue_t queue;
|
|
28 } ngx_http_limit_req_shctx_t;
|
|
29
|
|
30
|
|
31 typedef struct {
|
|
32 ngx_http_limit_req_shctx_t *sh;
|
|
33 ngx_slab_pool_t *shpool;
|
|
34 /* integer value, 1 corresponds to 0.001 r/s */
|
|
35 ngx_uint_t rate;
|
|
36 ngx_int_t index;
|
|
37 ngx_str_t var;
|
416
|
38 } ngx_http_limit_req_ctx_t;
|
|
39
|
|
40
|
|
41 typedef struct {
|
480
|
42 ngx_shm_zone_t *shm_zone;
|
|
43 /* integer value, 1 corresponds to 0.001 r/s */
|
|
44 ngx_uint_t burst;
|
|
45 ngx_uint_t nodelay;/* unsigned nodelay:1 */
|
416
|
46 } ngx_http_limit_req_conf_t;
|
|
47
|
|
48
|
|
49 static void ngx_http_limit_req_delay(ngx_http_request_t *r);
|
426
|
50 static ngx_int_t ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf,
|
|
51 ngx_uint_t hash, u_char *data, size_t len, ngx_http_limit_req_node_t **lrp);
|
416
|
52 static void ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx,
|
|
53 ngx_uint_t n);
|
|
54
|
|
55 static void *ngx_http_limit_req_create_conf(ngx_conf_t *cf);
|
|
56 static char *ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent,
|
|
57 void *child);
|
|
58 static char *ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
59 void *conf);
|
|
60 static char *ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd,
|
|
61 void *conf);
|
|
62 static ngx_int_t ngx_http_limit_req_init(ngx_conf_t *cf);
|
|
63
|
|
64
|
|
65 static ngx_command_t ngx_http_limit_req_commands[] = {
|
|
66
|
|
67 { ngx_string("limit_req_zone"),
|
|
68 NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE3,
|
|
69 ngx_http_limit_req_zone,
|
|
70 0,
|
|
71 0,
|
|
72 NULL },
|
|
73
|
|
74 { ngx_string("limit_req"),
|
|
75 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE123,
|
|
76 ngx_http_limit_req,
|
|
77 NGX_HTTP_LOC_CONF_OFFSET,
|
|
78 0,
|
|
79 NULL },
|
|
80
|
|
81 ngx_null_command
|
|
82 };
|
|
83
|
|
84
|
|
85 static ngx_http_module_t ngx_http_limit_req_module_ctx = {
|
|
86 NULL, /* preconfiguration */
|
|
87 ngx_http_limit_req_init, /* postconfiguration */
|
|
88
|
|
89 NULL, /* create main configuration */
|
|
90 NULL, /* init main configuration */
|
|
91
|
|
92 NULL, /* create server configuration */
|
|
93 NULL, /* merge server configuration */
|
|
94
|
|
95 ngx_http_limit_req_create_conf, /* create location configration */
|
|
96 ngx_http_limit_req_merge_conf /* merge location configration */
|
|
97 };
|
|
98
|
|
99
|
|
100 ngx_module_t ngx_http_limit_req_module = {
|
|
101 NGX_MODULE_V1,
|
|
102 &ngx_http_limit_req_module_ctx, /* module context */
|
|
103 ngx_http_limit_req_commands, /* module directives */
|
|
104 NGX_HTTP_MODULE, /* module type */
|
|
105 NULL, /* init master */
|
|
106 NULL, /* init module */
|
|
107 NULL, /* init process */
|
|
108 NULL, /* init thread */
|
|
109 NULL, /* exit thread */
|
|
110 NULL, /* exit process */
|
|
111 NULL, /* exit master */
|
|
112 NGX_MODULE_V1_PADDING
|
|
113 };
|
|
114
|
|
115
|
|
116 static ngx_int_t
|
|
117 ngx_http_limit_req_handler(ngx_http_request_t *r)
|
|
118 {
|
|
119 size_t len, n;
|
|
120 uint32_t hash;
|
|
121 ngx_int_t rc;
|
420
|
122 ngx_uint_t excess;
|
416
|
123 ngx_time_t *tp;
|
|
124 ngx_rbtree_node_t *node;
|
|
125 ngx_http_variable_value_t *vv;
|
|
126 ngx_http_limit_req_ctx_t *ctx;
|
426
|
127 ngx_http_limit_req_node_t *lr;
|
|
128 ngx_http_limit_req_conf_t *lrcf;
|
416
|
129
|
|
130 if (r->main->limit_req_set) {
|
|
131 return NGX_DECLINED;
|
|
132 }
|
|
133
|
426
|
134 lrcf = ngx_http_get_module_loc_conf(r, ngx_http_limit_req_module);
|
416
|
135
|
426
|
136 if (lrcf->shm_zone == NULL) {
|
416
|
137 return NGX_DECLINED;
|
|
138 }
|
|
139
|
426
|
140 ctx = lrcf->shm_zone->data;
|
416
|
141
|
|
142 vv = ngx_http_get_indexed_variable(r, ctx->index);
|
|
143
|
|
144 if (vv == NULL || vv->not_found) {
|
|
145 return NGX_DECLINED;
|
|
146 }
|
|
147
|
|
148 len = vv->len;
|
|
149
|
|
150 if (len == 0) {
|
|
151 return NGX_DECLINED;
|
|
152 }
|
|
153
|
|
154 if (len > 65535) {
|
|
155 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
156 "the value of the \"%V\" variable "
|
|
157 "is more than 65535 bytes: \"%v\"",
|
|
158 &ctx->var, vv);
|
|
159 return NGX_DECLINED;
|
|
160 }
|
|
161
|
|
162 r->main->limit_req_set = 1;
|
|
163
|
|
164 hash = ngx_crc32_short(vv->data, len);
|
|
165
|
|
166 ngx_shmtx_lock(&ctx->shpool->mutex);
|
|
167
|
|
168 ngx_http_limit_req_expire(ctx, 1);
|
|
169
|
426
|
170 rc = ngx_http_limit_req_lookup(lrcf, hash, vv->data, len, &lr);
|
416
|
171
|
426
|
172 if (lr) {
|
|
173 ngx_queue_remove(&lr->queue);
|
416
|
174
|
480
|
175 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
|
416
|
176
|
426
|
177 excess = lr->excess;
|
416
|
178
|
|
179 } else {
|
420
|
180 excess = 0;
|
416
|
181 }
|
|
182
|
420
|
183 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
506
|
184 "limit_req: %i %ui.%03ui", rc, excess / 1000, excess % 1000);
|
416
|
185
|
|
186 if (rc == NGX_BUSY) {
|
|
187 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
188
|
|
189 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
426
|
190 "limiting requests, excess: %ui.%03ui by zone \"%V\"",
|
480
|
191 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
|
416
|
192
|
|
193 return NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
194 }
|
|
195
|
|
196 if (rc == NGX_AGAIN) {
|
|
197 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
198
|
426
|
199 if (lrcf->nodelay) {
|
418
|
200 return NGX_DECLINED;
|
416
|
201 }
|
|
202
|
418
|
203 ngx_log_error(NGX_LOG_WARN, r->connection->log, 0,
|
426
|
204 "delaying request, excess: %ui.%03ui, by zone \"%V\"",
|
480
|
205 excess / 1000, excess % 1000, &lrcf->shm_zone->shm.name);
|
418
|
206
|
|
207 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
|
|
208 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
209 }
|
|
210
|
|
211 r->read_event_handler = ngx_http_test_reading;
|
|
212 r->write_event_handler = ngx_http_limit_req_delay;
|
420
|
213 ngx_add_timer(r->connection->write, (ngx_msec_t) excess);
|
418
|
214
|
|
215 return NGX_AGAIN;
|
416
|
216 }
|
|
217
|
|
218 if (rc == NGX_OK) {
|
|
219 goto done;
|
|
220 }
|
|
221
|
|
222 /* rc == NGX_DECLINED */
|
|
223
|
|
224 n = offsetof(ngx_rbtree_node_t, color)
|
|
225 + offsetof(ngx_http_limit_req_node_t, data)
|
|
226 + len;
|
|
227
|
|
228 node = ngx_slab_alloc_locked(ctx->shpool, n);
|
|
229 if (node == NULL) {
|
|
230
|
|
231 ngx_http_limit_req_expire(ctx, 0);
|
|
232
|
|
233 node = ngx_slab_alloc_locked(ctx->shpool, n);
|
|
234 if (node == NULL) {
|
|
235 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
236 return NGX_HTTP_SERVICE_UNAVAILABLE;
|
|
237 }
|
|
238 }
|
|
239
|
426
|
240 lr = (ngx_http_limit_req_node_t *) &node->color;
|
416
|
241
|
|
242 node->key = hash;
|
426
|
243 lr->len = (u_char) len;
|
416
|
244
|
|
245 tp = ngx_timeofday();
|
426
|
246 lr->last = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
416
|
247
|
426
|
248 lr->excess = 0;
|
|
249 ngx_memcpy(lr->data, vv->data, len);
|
416
|
250
|
480
|
251 ngx_rbtree_insert(&ctx->sh->rbtree, node);
|
416
|
252
|
480
|
253 ngx_queue_insert_head(&ctx->sh->queue, &lr->queue);
|
416
|
254
|
|
255 done:
|
|
256
|
|
257 ngx_shmtx_unlock(&ctx->shpool->mutex);
|
|
258
|
|
259 return NGX_DECLINED;
|
|
260 }
|
|
261
|
|
262
|
|
263 static void
|
|
264 ngx_http_limit_req_delay(ngx_http_request_t *r)
|
|
265 {
|
506
|
266 ngx_event_t *wev;
|
|
267
|
416
|
268 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
506
|
269 "limit_req delay");
|
|
270
|
|
271 wev = r->connection->write;
|
|
272
|
|
273 if (!wev->timedout) {
|
|
274
|
|
275 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
|
|
276 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
277 }
|
|
278
|
|
279 return;
|
|
280 }
|
|
281
|
|
282 wev->timedout = 0;
|
416
|
283
|
|
284 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
|
|
285 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
|
|
286 return;
|
|
287 }
|
|
288
|
|
289 r->read_event_handler = ngx_http_block_reading;
|
|
290 r->write_event_handler = ngx_http_core_run_phases;
|
|
291
|
|
292 ngx_http_core_run_phases(r);
|
|
293 }
|
|
294
|
|
295
|
|
296 static void
|
|
297 ngx_http_limit_req_rbtree_insert_value(ngx_rbtree_node_t *temp,
|
|
298 ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
|
|
299 {
|
|
300 ngx_rbtree_node_t **p;
|
426
|
301 ngx_http_limit_req_node_t *lrn, *lrnt;
|
416
|
302
|
|
303 for ( ;; ) {
|
|
304
|
|
305 if (node->key < temp->key) {
|
|
306
|
|
307 p = &temp->left;
|
|
308
|
|
309 } else if (node->key > temp->key) {
|
|
310
|
|
311 p = &temp->right;
|
|
312
|
|
313 } else { /* node->key == temp->key */
|
|
314
|
426
|
315 lrn = (ngx_http_limit_req_node_t *) &node->color;
|
|
316 lrnt = (ngx_http_limit_req_node_t *) &temp->color;
|
416
|
317
|
426
|
318 p = (ngx_memn2cmp(lrn->data, lrnt->data, lrn->len, lrnt->len) < 0)
|
416
|
319 ? &temp->left : &temp->right;
|
|
320 }
|
|
321
|
|
322 if (*p == sentinel) {
|
|
323 break;
|
|
324 }
|
|
325
|
|
326 temp = *p;
|
|
327 }
|
|
328
|
|
329 *p = node;
|
|
330 node->parent = temp;
|
|
331 node->left = sentinel;
|
|
332 node->right = sentinel;
|
|
333 ngx_rbt_red(node);
|
|
334 }
|
|
335
|
|
336
|
|
337 static ngx_int_t
|
426
|
338 ngx_http_limit_req_lookup(ngx_http_limit_req_conf_t *lrcf, ngx_uint_t hash,
|
|
339 u_char *data, size_t len, ngx_http_limit_req_node_t **lrp)
|
416
|
340 {
|
420
|
341 ngx_int_t rc, excess;
|
416
|
342 ngx_time_t *tp;
|
|
343 ngx_msec_t now;
|
|
344 ngx_msec_int_t ms;
|
|
345 ngx_rbtree_node_t *node, *sentinel;
|
|
346 ngx_http_limit_req_ctx_t *ctx;
|
426
|
347 ngx_http_limit_req_node_t *lr;
|
416
|
348
|
426
|
349 ctx = lrcf->shm_zone->data;
|
416
|
350
|
480
|
351 node = ctx->sh->rbtree.root;
|
|
352 sentinel = ctx->sh->rbtree.sentinel;
|
416
|
353
|
|
354 while (node != sentinel) {
|
|
355
|
|
356 if (hash < node->key) {
|
|
357 node = node->left;
|
|
358 continue;
|
|
359 }
|
|
360
|
|
361 if (hash > node->key) {
|
|
362 node = node->right;
|
|
363 continue;
|
|
364 }
|
|
365
|
|
366 /* hash == node->key */
|
|
367
|
|
368 do {
|
426
|
369 lr = (ngx_http_limit_req_node_t *) &node->color;
|
416
|
370
|
426
|
371 rc = ngx_memn2cmp(data, lr->data, len, (size_t) lr->len);
|
416
|
372
|
|
373 if (rc == 0) {
|
|
374
|
|
375 tp = ngx_timeofday();
|
|
376
|
|
377 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
426
|
378 ms = (ngx_msec_int_t) (now - lr->last);
|
416
|
379
|
426
|
380 excess = lr->excess - ctx->rate * ngx_abs(ms) / 1000 + 1000;
|
416
|
381
|
420
|
382 if (excess < 0) {
|
|
383 excess = 0;
|
416
|
384 }
|
|
385
|
426
|
386 lr->excess = excess;
|
|
387 lr->last = now;
|
416
|
388
|
426
|
389 *lrp = lr;
|
416
|
390
|
426
|
391 if ((ngx_uint_t) excess > lrcf->burst) {
|
416
|
392 return NGX_BUSY;
|
|
393 }
|
|
394
|
420
|
395 if (excess) {
|
416
|
396 return NGX_AGAIN;
|
|
397 }
|
|
398
|
|
399 return NGX_OK;
|
|
400 }
|
|
401
|
|
402 node = (rc < 0) ? node->left : node->right;
|
|
403
|
|
404 } while (node != sentinel && hash == node->key);
|
|
405
|
|
406 break;
|
|
407 }
|
|
408
|
426
|
409 *lrp = NULL;
|
416
|
410
|
|
411 return NGX_DECLINED;
|
|
412 }
|
|
413
|
|
414
|
|
415 static void
|
|
416 ngx_http_limit_req_expire(ngx_http_limit_req_ctx_t *ctx, ngx_uint_t n)
|
|
417 {
|
420
|
418 ngx_int_t excess;
|
416
|
419 ngx_time_t *tp;
|
|
420 ngx_msec_t now;
|
|
421 ngx_queue_t *q;
|
|
422 ngx_msec_int_t ms;
|
|
423 ngx_rbtree_node_t *node;
|
426
|
424 ngx_http_limit_req_node_t *lr;
|
416
|
425
|
|
426 tp = ngx_timeofday();
|
|
427
|
|
428 now = (ngx_msec_t) (tp->sec * 1000 + tp->msec);
|
|
429
|
|
430 /*
|
|
431 * n == 1 deletes one or two zero rate entries
|
|
432 * n == 0 deletes oldest entry by force
|
|
433 * and one or two zero rate entries
|
|
434 */
|
|
435
|
|
436 while (n < 3) {
|
|
437
|
480
|
438 if (ngx_queue_empty(&ctx->sh->queue)) {
|
416
|
439 return;
|
|
440 }
|
|
441
|
480
|
442 q = ngx_queue_last(&ctx->sh->queue);
|
416
|
443
|
426
|
444 lr = ngx_queue_data(q, ngx_http_limit_req_node_t, queue);
|
416
|
445
|
|
446 if (n++ != 0) {
|
|
447
|
426
|
448 ms = (ngx_msec_int_t) (now - lr->last);
|
416
|
449 ms = ngx_abs(ms);
|
|
450
|
|
451 if (ms < 60000) {
|
|
452 return;
|
|
453 }
|
|
454
|
426
|
455 excess = lr->excess - ctx->rate * ms / 1000;
|
416
|
456
|
420
|
457 if (excess > 0) {
|
416
|
458 return;
|
|
459 }
|
|
460 }
|
|
461
|
|
462 ngx_queue_remove(q);
|
|
463
|
|
464 node = (ngx_rbtree_node_t *)
|
426
|
465 ((u_char *) lr - offsetof(ngx_rbtree_node_t, color));
|
416
|
466
|
480
|
467 ngx_rbtree_delete(&ctx->sh->rbtree, node);
|
416
|
468
|
|
469 ngx_slab_free_locked(ctx->shpool, node);
|
|
470 }
|
|
471 }
|
|
472
|
|
473
|
|
474 static ngx_int_t
|
|
475 ngx_http_limit_req_init_zone(ngx_shm_zone_t *shm_zone, void *data)
|
|
476 {
|
|
477 ngx_http_limit_req_ctx_t *octx = data;
|
|
478
|
468
|
479 size_t len;
|
416
|
480 ngx_http_limit_req_ctx_t *ctx;
|
|
481
|
|
482 ctx = shm_zone->data;
|
|
483
|
|
484 if (octx) {
|
|
485 if (ngx_strcmp(ctx->var.data, octx->var.data) != 0) {
|
|
486 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
|
|
487 "limit_req \"%V\" uses the \"%V\" variable "
|
|
488 "while previously it used the \"%V\" variable",
|
480
|
489 &shm_zone->shm.name, &ctx->var, &octx->var);
|
416
|
490 return NGX_ERROR;
|
|
491 }
|
|
492
|
480
|
493 ctx->sh = octx->sh;
|
416
|
494 ctx->shpool = octx->shpool;
|
|
495
|
|
496 return NGX_OK;
|
|
497 }
|
|
498
|
|
499 ctx->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
|
|
500
|
480
|
501 if (shm_zone->shm.exists) {
|
|
502 ctx->sh = ctx->shpool->data;
|
|
503
|
|
504 return NGX_OK;
|
416
|
505 }
|
|
506
|
480
|
507 ctx->sh = ngx_slab_alloc(ctx->shpool, sizeof(ngx_http_limit_req_shctx_t));
|
|
508 if (ctx->sh == NULL) {
|
416
|
509 return NGX_ERROR;
|
|
510 }
|
|
511
|
480
|
512 ctx->shpool->data = ctx->sh;
|
|
513
|
|
514 ngx_rbtree_init(&ctx->sh->rbtree, &ctx->sh->sentinel,
|
416
|
515 ngx_http_limit_req_rbtree_insert_value);
|
|
516
|
480
|
517 ngx_queue_init(&ctx->sh->queue);
|
416
|
518
|
480
|
519 len = sizeof(" in limit_req zone \"\"") + shm_zone->shm.name.len;
|
468
|
520
|
|
521 ctx->shpool->log_ctx = ngx_slab_alloc(ctx->shpool, len);
|
|
522 if (ctx->shpool->log_ctx == NULL) {
|
|
523 return NGX_ERROR;
|
|
524 }
|
|
525
|
|
526 ngx_sprintf(ctx->shpool->log_ctx, " in limit_req zone \"%V\"%Z",
|
480
|
527 &shm_zone->shm.name);
|
468
|
528
|
416
|
529 return NGX_OK;
|
|
530 }
|
|
531
|
|
532
|
|
533 static void *
|
|
534 ngx_http_limit_req_create_conf(ngx_conf_t *cf)
|
|
535 {
|
|
536 ngx_http_limit_req_conf_t *conf;
|
|
537
|
|
538 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_conf_t));
|
|
539 if (conf == NULL) {
|
496
|
540 return NULL;
|
416
|
541 }
|
|
542
|
|
543 /*
|
|
544 * set by ngx_pcalloc():
|
|
545 *
|
|
546 * conf->shm_zone = NULL;
|
426
|
547 * conf->burst = 0;
|
418
|
548 * conf->nodelay = 0;
|
416
|
549 */
|
|
550
|
|
551 return conf;
|
|
552 }
|
|
553
|
|
554
|
|
555 static char *
|
|
556 ngx_http_limit_req_merge_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
557 {
|
|
558 ngx_http_limit_req_conf_t *prev = parent;
|
|
559 ngx_http_limit_req_conf_t *conf = child;
|
|
560
|
|
561 if (conf->shm_zone == NULL) {
|
|
562 *conf = *prev;
|
|
563 }
|
|
564
|
|
565 return NGX_CONF_OK;
|
|
566 }
|
|
567
|
|
568
|
|
569 static char *
|
|
570 ngx_http_limit_req_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
571 {
|
|
572 u_char *p;
|
|
573 size_t size, len;
|
|
574 ngx_str_t *value, name, s;
|
|
575 ngx_int_t rate, scale;
|
|
576 ngx_uint_t i;
|
|
577 ngx_shm_zone_t *shm_zone;
|
|
578 ngx_http_limit_req_ctx_t *ctx;
|
|
579
|
|
580 value = cf->args->elts;
|
|
581
|
|
582 ctx = NULL;
|
|
583 size = 0;
|
|
584 rate = 1;
|
|
585 scale = 1;
|
|
586 name.len = 0;
|
|
587
|
|
588 for (i = 1; i < cf->args->nelts; i++) {
|
|
589
|
|
590 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
591
|
|
592 name.data = value[i].data + 5;
|
|
593
|
|
594 p = (u_char *) ngx_strchr(name.data, ':');
|
|
595
|
|
596 if (p) {
|
480
|
597 *p = '\0';
|
|
598
|
416
|
599 name.len = p - name.data;
|
|
600
|
|
601 p++;
|
|
602
|
|
603 s.len = value[i].data + value[i].len - p;
|
|
604 s.data = p;
|
|
605
|
|
606 size = ngx_parse_size(&s);
|
|
607 if (size > 8191) {
|
|
608 continue;
|
|
609 }
|
|
610 }
|
|
611
|
|
612 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
613 "invalid zone size \"%V\"", &value[i]);
|
|
614 return NGX_CONF_ERROR;
|
|
615 }
|
|
616
|
|
617 if (ngx_strncmp(value[i].data, "rate=", 5) == 0) {
|
|
618
|
|
619 len = value[i].len;
|
|
620 p = value[i].data + len - 3;
|
|
621
|
|
622 if (ngx_strncmp(p, "r/s", 3) == 0) {
|
|
623 scale = 1;
|
|
624 len -= 3;
|
|
625
|
|
626 } else if (ngx_strncmp(p, "r/m", 3) == 0) {
|
|
627 scale = 60;
|
|
628 len -= 3;
|
|
629 }
|
|
630
|
|
631 rate = ngx_atoi(value[i].data + 5, len - 5);
|
|
632 if (rate <= NGX_ERROR) {
|
|
633 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
634 "invalid rate \"%V\"", &value[i]);
|
|
635 return NGX_CONF_ERROR;
|
|
636 }
|
|
637
|
|
638 continue;
|
|
639 }
|
|
640
|
|
641 if (value[i].data[0] == '$') {
|
|
642
|
|
643 value[i].len--;
|
|
644 value[i].data++;
|
|
645
|
|
646 ctx = ngx_pcalloc(cf->pool, sizeof(ngx_http_limit_req_ctx_t));
|
|
647 if (ctx == NULL) {
|
|
648 return NGX_CONF_ERROR;
|
|
649 }
|
|
650
|
|
651 ctx->index = ngx_http_get_variable_index(cf, &value[i]);
|
|
652 if (ctx->index == NGX_ERROR) {
|
|
653 return NGX_CONF_ERROR;
|
|
654 }
|
|
655
|
|
656 ctx->var = value[i];
|
|
657
|
|
658 continue;
|
|
659 }
|
|
660
|
|
661 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
662 "invalid parameter \"%V\"", &value[i]);
|
|
663 return NGX_CONF_ERROR;
|
|
664 }
|
|
665
|
|
666 if (name.len == 0 || size == 0) {
|
|
667 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
668 "\"%V\" must have \"zone\" parameter",
|
|
669 &cmd->name);
|
|
670 return NGX_CONF_ERROR;
|
|
671 }
|
|
672
|
|
673 if (ctx == NULL) {
|
|
674 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
675 "no variable is defined for limit_req_zone \"%V\"",
|
|
676 &cmd->name);
|
|
677 return NGX_CONF_ERROR;
|
|
678 }
|
|
679
|
420
|
680 ctx->rate = rate * 1000 / scale;
|
416
|
681
|
|
682 shm_zone = ngx_shared_memory_add(cf, &name, size,
|
|
683 &ngx_http_limit_req_module);
|
|
684 if (shm_zone == NULL) {
|
|
685 return NGX_CONF_ERROR;
|
|
686 }
|
|
687
|
|
688 if (shm_zone->data) {
|
|
689 ctx = shm_zone->data;
|
|
690
|
|
691 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
692 "limit_req_zone \"%V\" is already bound to variable \"%V\"",
|
|
693 &value[1], &ctx->var);
|
|
694 return NGX_CONF_ERROR;
|
|
695 }
|
|
696
|
|
697 shm_zone->init = ngx_http_limit_req_init_zone;
|
|
698 shm_zone->data = ctx;
|
|
699
|
|
700 return NGX_CONF_OK;
|
|
701 }
|
|
702
|
|
703
|
|
704 static char *
|
|
705 ngx_http_limit_req(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
706 {
|
426
|
707 ngx_http_limit_req_conf_t *lrcf = conf;
|
416
|
708
|
418
|
709 ngx_int_t burst;
|
|
710 ngx_str_t *value, s;
|
|
711 ngx_uint_t i;
|
416
|
712
|
426
|
713 if (lrcf->shm_zone) {
|
416
|
714 return "is duplicate";
|
|
715 }
|
|
716
|
|
717 value = cf->args->elts;
|
|
718
|
|
719 burst = 0;
|
|
720
|
|
721 for (i = 1; i < cf->args->nelts; i++) {
|
|
722
|
|
723 if (ngx_strncmp(value[i].data, "zone=", 5) == 0) {
|
|
724
|
|
725 s.len = value[i].len - 5;
|
|
726 s.data = value[i].data + 5;
|
|
727
|
426
|
728 lrcf->shm_zone = ngx_shared_memory_add(cf, &s, 0,
|
416
|
729 &ngx_http_limit_req_module);
|
426
|
730 if (lrcf->shm_zone == NULL) {
|
416
|
731 return NGX_CONF_ERROR;
|
|
732 }
|
|
733
|
|
734 continue;
|
|
735 }
|
|
736
|
|
737 if (ngx_strncmp(value[i].data, "burst=", 6) == 0) {
|
|
738
|
418
|
739 burst = ngx_atoi(value[i].data + 6, value[i].len - 6);
|
416
|
740 if (burst <= 0) {
|
|
741 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
742 "invalid burst rate \"%V\"", &value[i]);
|
|
743 return NGX_CONF_ERROR;
|
|
744 }
|
|
745
|
|
746 continue;
|
|
747 }
|
|
748
|
418
|
749 if (ngx_strncmp(value[i].data, "nodelay", 7) == 0) {
|
426
|
750 lrcf->nodelay = 1;
|
416
|
751 continue;
|
|
752 }
|
|
753
|
|
754 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
755 "invalid parameter \"%V\"", &value[i]);
|
|
756 return NGX_CONF_ERROR;
|
|
757 }
|
|
758
|
426
|
759 if (lrcf->shm_zone == NULL) {
|
416
|
760 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
761 "\"%V\" must have \"zone\" parameter",
|
|
762 &cmd->name);
|
|
763 return NGX_CONF_ERROR;
|
|
764 }
|
|
765
|
426
|
766 if (lrcf->shm_zone->data == NULL) {
|
416
|
767 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
768 "unknown limit_req_zone \"%V\"",
|
480
|
769 &lrcf->shm_zone->shm.name);
|
416
|
770 return NGX_CONF_ERROR;
|
|
771 }
|
|
772
|
426
|
773 lrcf->burst = burst * 1000;
|
416
|
774
|
|
775 return NGX_CONF_OK;
|
|
776 }
|
|
777
|
|
778
|
|
779 static ngx_int_t
|
|
780 ngx_http_limit_req_init(ngx_conf_t *cf)
|
|
781 {
|
|
782 ngx_http_handler_pt *h;
|
|
783 ngx_http_core_main_conf_t *cmcf;
|
|
784
|
|
785 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
|
|
786
|
|
787 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
|
|
788 if (h == NULL) {
|
|
789 return NGX_ERROR;
|
|
790 }
|
|
791
|
|
792 *h = ngx_http_limit_req_handler;
|
|
793
|
|
794 return NGX_OK;
|
|
795 }
|