0
|
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
|
|
13 static ngx_http_module_t ngx_http_cache_module_ctx = {
|
|
14 NULL, /* pre conf */
|
|
15
|
|
16 NULL, /* create main configuration */
|
|
17 NULL, /* init main configuration */
|
|
18
|
|
19 NULL, /* create server configuration */
|
|
20 NULL, /* merge server configuration */
|
|
21
|
|
22 NULL, /* create location configuration */
|
|
23 NULL /* merge location configuration */
|
|
24 };
|
|
25
|
|
26
|
|
27 ngx_module_t ngx_http_cache_module = {
|
|
28 NGX_MODULE,
|
|
29 &ngx_http_cache_module_ctx, /* module context */
|
|
30 NULL, /* module directives */
|
|
31 NGX_HTTP_MODULE, /* module type */
|
|
32 NULL, /* init module */
|
|
33 NULL /* init child */
|
|
34 };
|
|
35
|
|
36
|
|
37 ngx_http_cache_t *ngx_http_cache_get(ngx_http_cache_hash_t *hash,
|
|
38 ngx_http_cleanup_t *cleanup,
|
|
39 ngx_str_t *key, uint32_t *crc)
|
|
40 {
|
|
41 ngx_uint_t i;
|
|
42 ngx_http_cache_t *c;
|
|
43
|
|
44 *crc = ngx_crc(key->data, key->len);
|
|
45
|
|
46 c = hash->elts + *crc % hash->hash * hash->nelts;
|
|
47
|
|
48 if (ngx_mutex_lock(&hash->mutex) == NGX_ERROR) {
|
|
49 return (void *) NGX_ERROR;
|
|
50 }
|
|
51
|
|
52 for (i = 0; i < hash->nelts; i++) {
|
|
53 if (c[i].crc == *crc
|
|
54 && c[i].key.len == key->len
|
|
55 && ngx_rstrncmp(c[i].key.data, key->data, key->len) == 0)
|
|
56 {
|
|
57 #if 0
|
|
58 if (c[i].expired) {
|
|
59 ngx_mutex_unlock(&hash->mutex);
|
|
60 return (void *) NGX_AGAIN;
|
|
61 }
|
|
62 #endif
|
|
63
|
|
64 c[i].refs++;
|
|
65
|
|
66 if ((!(c[i].notify && (ngx_event_flags & NGX_HAVE_KQUEUE_EVENT)))
|
|
67 && (ngx_cached_time - c[i].updated >= hash->update))
|
|
68 {
|
|
69 c[i].expired = 1;
|
|
70 }
|
|
71
|
|
72 ngx_mutex_unlock(&hash->mutex);
|
|
73
|
|
74 if (cleanup) {
|
|
75 cleanup->data.cache.hash = hash;
|
|
76 cleanup->data.cache.cache = &c[i];
|
|
77 cleanup->valid = 1;
|
|
78 cleanup->cache = 1;
|
|
79 }
|
|
80
|
|
81 return &c[i];
|
|
82 }
|
|
83 }
|
|
84
|
|
85 ngx_mutex_unlock(&hash->mutex);
|
|
86
|
|
87 return NULL;
|
|
88 }
|
|
89
|
|
90
|
|
91 ngx_http_cache_t *ngx_http_cache_alloc(ngx_http_cache_hash_t *hash,
|
|
92 ngx_http_cache_t *cache,
|
|
93 ngx_http_cleanup_t *cleanup,
|
|
94 ngx_str_t *key, uint32_t crc,
|
|
95 ngx_str_t *value, ngx_log_t *log)
|
|
96 {
|
|
97 time_t old;
|
|
98 ngx_uint_t i;
|
|
99 ngx_http_cache_t *c;
|
|
100
|
|
101 old = ngx_cached_time + 1;
|
|
102
|
|
103 c = hash->elts + crc % hash->hash * hash->nelts;
|
|
104
|
|
105 if (ngx_mutex_lock(&hash->mutex) == NGX_ERROR) {
|
|
106 return (void *) NGX_ERROR;
|
|
107 }
|
|
108
|
|
109 if (cache == NULL) {
|
|
110
|
|
111 /* allocate a new entry */
|
|
112
|
|
113 for (i = 0; i < hash->nelts; i++) {
|
|
114 if (c[i].refs > 0) {
|
|
115 /* a busy entry */
|
|
116 continue;
|
|
117 }
|
|
118
|
|
119 if (c[i].key.len == 0) {
|
|
120 /* a free entry is found */
|
|
121 cache = &c[i];
|
|
122 break;
|
|
123 }
|
|
124
|
|
125 /* looking for the oldest cache entry */
|
|
126
|
|
127 if (old > c[i].accessed) {
|
|
128
|
|
129 old = c[i].accessed;
|
|
130 cache = &c[i];
|
|
131 }
|
|
132 }
|
|
133
|
|
134 if (cache == NULL) {
|
|
135 ngx_mutex_unlock(&hash->mutex);
|
|
136 return NULL;
|
|
137 }
|
|
138
|
|
139 ngx_http_cache_free(cache, key, value, log);
|
|
140
|
|
141 if (cache->key.data == NULL) {
|
|
142 cache->key.data = ngx_alloc(key->len, log);
|
|
143 if (cache->key.data == NULL) {
|
|
144 ngx_http_cache_free(cache, NULL, NULL, log);
|
|
145 ngx_mutex_unlock(&hash->mutex);
|
|
146 return NULL;
|
|
147 }
|
|
148 }
|
|
149
|
|
150 cache->key.len = key->len;
|
|
151 ngx_memcpy(cache->key.data, key->data, key->len);
|
|
152
|
|
153 } else if (value) {
|
|
154 ngx_http_cache_free(cache, key, value, log);
|
|
155 }
|
|
156
|
|
157 if (value) {
|
|
158 if (cache->data.value.data == NULL) {
|
|
159 cache->data.value.data = ngx_alloc(value->len, log);
|
|
160 if (cache->data.value.data == NULL) {
|
|
161 ngx_http_cache_free(cache, NULL, NULL, log);
|
|
162 ngx_mutex_unlock(&hash->mutex);
|
|
163 return NULL;
|
|
164 }
|
|
165 }
|
|
166
|
|
167 cache->data.value.len = value->len;
|
|
168 ngx_memcpy(cache->data.value.data, value->data, value->len);
|
|
169 }
|
|
170
|
|
171 cache->crc = crc;
|
|
172 cache->key.len = key->len;
|
|
173
|
|
174 cache->refs = 1;
|
|
175 cache->count = 0;
|
|
176
|
|
177 cache->deleted = 0;
|
|
178 cache->expired = 0;
|
|
179 cache->memory = 0;
|
|
180 cache->mmap = 0;
|
|
181 cache->notify = 0;
|
|
182
|
|
183 if (cleanup) {
|
|
184 cleanup->data.cache.hash = hash;
|
|
185 cleanup->data.cache.cache = cache;
|
|
186 cleanup->valid = 1;
|
|
187 cleanup->cache = 1;
|
|
188 }
|
|
189
|
|
190 ngx_mutex_unlock(&hash->mutex);
|
|
191
|
|
192 return cache;
|
|
193 }
|
|
194
|
|
195
|
|
196 void ngx_http_cache_free(ngx_http_cache_t *cache,
|
|
197 ngx_str_t *key, ngx_str_t *value, ngx_log_t *log)
|
|
198 {
|
|
199 if (cache->memory) {
|
|
200 if (cache->data.value.data
|
|
201 && (value == NULL || value->len > cache->data.value.len))
|
|
202 {
|
|
203 ngx_free(cache->data.value.data);
|
|
204 cache->data.value.data = NULL;
|
|
205 }
|
|
206 }
|
|
207
|
|
208 /* TODO: mmap */
|
|
209
|
|
210 cache->data.value.len = 0;
|
|
211
|
|
212 if (cache->fd != NGX_INVALID_FILE) {
|
|
213
|
|
214 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, log, 0,
|
|
215 "http cache close fd: %d", cache->fd);
|
|
216
|
|
217 if (ngx_close_file(cache->fd) == NGX_FILE_ERROR) {
|
|
218 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
|
|
219 ngx_close_file_n " \"%s\" failed",
|
|
220 cache->key.data);
|
|
221 }
|
|
222
|
|
223 cache->fd = NGX_INVALID_FILE;
|
|
224 }
|
|
225
|
|
226 if (cache->key.data && (key == NULL || key->len > cache->key.len)) {
|
|
227 ngx_free(cache->key.data);
|
|
228 cache->key.data = NULL;
|
|
229 }
|
|
230
|
|
231 cache->key.len = 0;
|
|
232
|
|
233 cache->refs = 0;
|
|
234 }
|
|
235
|
|
236
|
|
237 void ngx_http_cache_lock(ngx_http_cache_hash_t *hash, ngx_http_cache_t *cache)
|
|
238 {
|
|
239 if (ngx_mutex_lock(&hash->mutex) == NGX_ERROR) {
|
|
240 return;
|
|
241 }
|
|
242 }
|
|
243
|
|
244
|
|
245 void ngx_http_cache_unlock(ngx_http_cache_hash_t *hash,
|
|
246 ngx_http_cache_t *cache, ngx_log_t *log)
|
|
247 {
|
|
248 if (ngx_mutex_lock(&hash->mutex) == NGX_ERROR) {
|
|
249 return;
|
|
250 }
|
|
251
|
|
252 cache->refs--;
|
|
253
|
|
254 if (cache->refs == 0 && cache->deleted) {
|
|
255 ngx_http_cache_free(cache, NULL, NULL, log);
|
|
256 }
|
|
257
|
|
258 ngx_mutex_unlock(&hash->mutex);
|
|
259 }
|
|
260
|
|
261
|
|
262 #if 0
|
|
263
|
|
264 ngx_http_cache_add_file_event(ngx_http_cache_hash_t *hash,
|
|
265 ngx_http_cache_t *cache)
|
|
266 {
|
|
267 ngx_event_t *ev;
|
|
268 ngx_http_cache_event_ctx_t *ctx;
|
|
269
|
|
270 ev = &ngx_cycle->read_events[fd];
|
|
271 ngx_memzero(ev, sizeof(ngx_event_t);
|
|
272
|
|
273 ev->data = data;
|
|
274 ev->event_handler = ngx_http_cache_invalidate;
|
|
275
|
|
276 return ngx_add_event(ev, NGX_VNODE_EVENT, 0);
|
|
277 }
|
|
278
|
|
279
|
|
280 void ngx_http_cache_invalidate(ngx_event_t *ev)
|
|
281 {
|
|
282 ngx_http_cache_event_ctx_t *ctx;
|
|
283
|
|
284 ctx = ev->data;
|
|
285
|
|
286 ngx_http_cache_lock(&ctx->hash->mutex);
|
|
287
|
|
288 if (ctx->cache->refs == 0)
|
|
289 ngx_http_cache_free(ctx->cache, NULL, NULL, ctx->log);
|
|
290
|
|
291 } else {
|
|
292 ctx->cache->deleted = 1;
|
|
293 }
|
|
294
|
|
295 ngx_http_cache_unlock(&ctx->hash->mutex);
|
|
296 }
|
|
297
|
|
298 #endif
|
|
299
|
|
300
|
|
301 /* TODO: currently fd only */
|
|
302
|
|
303 ngx_int_t ngx_http_send_cached(ngx_http_request_t *r)
|
|
304 {
|
|
305 ngx_int_t rc;
|
|
306 ngx_hunk_t *h;
|
|
307 ngx_chain_t out;
|
|
308 ngx_http_log_ctx_t *ctx;
|
|
309
|
|
310 ctx = r->connection->log->data;
|
|
311 ctx->action = "sending response to client";
|
|
312
|
|
313 r->headers_out.status = NGX_HTTP_OK;
|
|
314 r->headers_out.content_length_n = r->cache->data.size;
|
|
315 r->headers_out.last_modified_time = r->cache->last_modified;
|
|
316
|
|
317 if (ngx_http_set_content_type(r) != NGX_OK) {
|
|
318 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
319 }
|
|
320
|
|
321 /* we need to allocate all before the header would be sent */
|
|
322
|
|
323 if (!(h = ngx_pcalloc(r->pool, sizeof(ngx_hunk_t)))) {
|
|
324 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
325 }
|
|
326
|
|
327 if (!(h->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t)))) {
|
|
328 return NGX_HTTP_INTERNAL_SERVER_ERROR;
|
|
329 }
|
|
330
|
|
331 rc = ngx_http_send_header(r);
|
|
332
|
|
333 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
|
|
334 return rc;
|
|
335 }
|
|
336
|
|
337 h->type = r->main ? NGX_HUNK_FILE : NGX_HUNK_FILE|NGX_HUNK_LAST;
|
|
338
|
|
339 h->file_pos = 0;
|
|
340 h->file_last = r->cache->data.size;
|
|
341
|
|
342 h->file->fd = r->cache->fd;
|
|
343 h->file->log = r->connection->log;
|
|
344
|
|
345 out.hunk = h;
|
|
346 out.next = NULL;
|
|
347
|
|
348 return ngx_http_output_filter(r, &out);
|
|
349 }
|
|
350
|
|
351
|
|
352 char *ngx_http_set_cache_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
353 {
|
|
354 char *p = conf;
|
|
355
|
|
356 ngx_int_t i, j, dup, invalid;
|
|
357 ngx_str_t *value, line;
|
|
358 ngx_http_cache_t *c;
|
|
359 ngx_http_cache_hash_t *ch, **chp;
|
|
360
|
|
361 chp = (ngx_http_cache_hash_t **) (p + cmd->offset);
|
|
362 if (*chp) {
|
|
363 return "is duplicate";
|
|
364 }
|
|
365
|
|
366 if (!(ch = ngx_pcalloc(cf->pool, sizeof(ngx_http_cache_hash_t)))) {
|
|
367 return NGX_CONF_ERROR;
|
|
368 }
|
|
369 *chp = ch;
|
|
370
|
|
371 dup = 0;
|
|
372 invalid = 0;
|
|
373
|
|
374 value = cf->args->elts;
|
|
375
|
|
376 for (i = 1; i < cf->args->nelts; i++) {
|
|
377
|
|
378 if (value[i].data[1] != '=') {
|
|
379 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
380 "invalid value \"%s\"", value[i].data);
|
|
381 return NGX_CONF_ERROR;
|
|
382 }
|
|
383
|
|
384 switch (value[i].data[0]) {
|
|
385
|
|
386 case 'h':
|
|
387 if (ch->hash) {
|
|
388 dup = 1;
|
|
389 break;
|
|
390 }
|
|
391
|
|
392 ch->hash = ngx_atoi(value[i].data + 2, value[i].len - 2);
|
|
393 if (ch->hash == (size_t) NGX_ERROR || ch->hash == 0) {
|
|
394 invalid = 1;
|
|
395 break;
|
|
396 }
|
|
397
|
|
398 continue;
|
|
399
|
|
400 case 'n':
|
|
401 if (ch->nelts) {
|
|
402 dup = 1;
|
|
403 break;
|
|
404 }
|
|
405
|
|
406 ch->nelts = ngx_atoi(value[i].data + 2, value[i].len - 2);
|
|
407 if (ch->nelts == (size_t) NGX_ERROR || ch->nelts == 0) {
|
|
408 invalid = 1;
|
|
409 break;
|
|
410 }
|
|
411
|
|
412 continue;
|
|
413
|
|
414 case 'l':
|
|
415 if (ch->life) {
|
|
416 dup = 1;
|
|
417 break;
|
|
418 }
|
|
419
|
|
420 line.len = value[i].len - 2;
|
|
421 line.data = value[i].data + 2;
|
|
422
|
|
423 ch->life = ngx_parse_time(&line, 1);
|
|
424 if (ch->life == NGX_ERROR || ch->life == 0) {
|
|
425 invalid = 1;
|
|
426 break;
|
|
427 }
|
|
428
|
|
429 continue;
|
|
430
|
|
431 case 'u':
|
|
432 if (ch->update) {
|
|
433 dup = 1;
|
|
434 break;
|
|
435 }
|
|
436
|
|
437 line.len = value[i].len - 2;
|
|
438 line.data = value[i].data + 2;
|
|
439
|
|
440 ch->update = ngx_parse_time(&line, 1);
|
|
441 if (ch->update == NGX_ERROR || ch->update == 0) {
|
|
442 invalid = 1;
|
|
443 break;
|
|
444 }
|
|
445
|
|
446 continue;
|
|
447
|
|
448 default:
|
|
449 invalid = 1;
|
|
450 }
|
|
451
|
|
452 if (dup) {
|
|
453 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
454 "duplicate value \"%s\"", value[i].data);
|
|
455 return NGX_CONF_ERROR;
|
|
456 }
|
|
457
|
|
458 if (invalid) {
|
|
459 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
460 "invalid value \"%s\"", value[i].data);
|
|
461 return NGX_CONF_ERROR;
|
|
462 }
|
|
463 }
|
|
464
|
|
465 ch->elts = ngx_pcalloc(cf->pool,
|
|
466 ch->hash * ch->nelts * sizeof(ngx_http_cache_t));
|
|
467 if (ch->elts == NULL) {
|
|
468 return NGX_CONF_ERROR;
|
|
469 }
|
|
470
|
|
471 for (i = 0; i < (ngx_int_t) ch->hash; i++) {
|
|
472 c = ch->elts + i * ch->nelts;
|
|
473
|
|
474 for (j = 0; j < (ngx_int_t) ch->nelts; j++) {
|
|
475 c[j].fd = NGX_INVALID_FILE;
|
|
476 }
|
|
477 }
|
|
478
|
|
479 return NGX_CONF_OK;
|
|
480 }
|