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nginx/src/http/ngx_http_file_cache.c
Dmitry Volyntsev c6df6bf923 Cache: ignore long locked entries during forced expire. 
Abnormally exited workers may leave locked cache entries, this can
result in the cache size on disk exceeding max_size and shared memory
exhaustion.

This change mitigates the issue by ignoring locked entries during forced
expire.  It also increases the visibility of the problem by logging such
entries.
2017-05-18 18:39:16 +03:00

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/*
* Copyright (C) Igor Sysoev
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_md5.h>
static ngx_int_t ngx_http_file_cache_lock(ngx_http_request_t *r,
ngx_http_cache_t *c);
static void ngx_http_file_cache_lock_wait_handler(ngx_event_t *ev);
static void ngx_http_file_cache_lock_wait(ngx_http_request_t *r,
ngx_http_cache_t *c);
static ngx_int_t ngx_http_file_cache_read(ngx_http_request_t *r,
ngx_http_cache_t *c);
static ssize_t ngx_http_file_cache_aio_read(ngx_http_request_t *r,
ngx_http_cache_t *c);
#if (NGX_HAVE_FILE_AIO)
static void ngx_http_cache_aio_event_handler(ngx_event_t *ev);
#endif
#if (NGX_THREADS)
static ngx_int_t ngx_http_cache_thread_handler(ngx_thread_task_t *task,
ngx_file_t *file);
static void ngx_http_cache_thread_event_handler(ngx_event_t *ev);
#endif
static ngx_int_t ngx_http_file_cache_exists(ngx_http_file_cache_t *cache,
ngx_http_cache_t *c);
static ngx_int_t ngx_http_file_cache_name(ngx_http_request_t *r,
ngx_path_t *path);
static ngx_http_file_cache_node_t *
ngx_http_file_cache_lookup(ngx_http_file_cache_t *cache, u_char *key);
static void ngx_http_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel);
static void ngx_http_file_cache_vary(ngx_http_request_t *r, u_char *vary,
size_t len, u_char *hash);
static void ngx_http_file_cache_vary_header(ngx_http_request_t *r,
ngx_md5_t *md5, ngx_str_t *name);
static ngx_int_t ngx_http_file_cache_reopen(ngx_http_request_t *r,
ngx_http_cache_t *c);
static ngx_int_t ngx_http_file_cache_update_variant(ngx_http_request_t *r,
ngx_http_cache_t *c);
static void ngx_http_file_cache_cleanup(void *data);
static time_t ngx_http_file_cache_forced_expire(ngx_http_file_cache_t *cache);
static time_t ngx_http_file_cache_expire(ngx_http_file_cache_t *cache);
static void ngx_http_file_cache_delete(ngx_http_file_cache_t *cache,
ngx_queue_t *q, u_char *name);
static void ngx_http_file_cache_loader_sleep(ngx_http_file_cache_t *cache);
static ngx_int_t ngx_http_file_cache_noop(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static ngx_int_t ngx_http_file_cache_manage_file(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static ngx_int_t ngx_http_file_cache_manage_directory(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static ngx_int_t ngx_http_file_cache_add_file(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static ngx_int_t ngx_http_file_cache_add(ngx_http_file_cache_t *cache,
ngx_http_cache_t *c);
static ngx_int_t ngx_http_file_cache_delete_file(ngx_tree_ctx_t *ctx,
ngx_str_t *path);
static void ngx_http_file_cache_set_watermark(ngx_http_file_cache_t *cache);
ngx_str_t ngx_http_cache_status[] = {
ngx_string("MISS"),
ngx_string("BYPASS"),
ngx_string("EXPIRED"),
ngx_string("STALE"),
ngx_string("UPDATING"),
ngx_string("REVALIDATED"),
ngx_string("HIT")
};
static u_char ngx_http_file_cache_key[] = { LF, 'K', 'E', 'Y', ':', ' ' };
static ngx_int_t
ngx_http_file_cache_init(ngx_shm_zone_t *shm_zone, void *data)
{
ngx_http_file_cache_t *ocache = data;
size_t len;
ngx_uint_t n;
ngx_http_file_cache_t *cache;
cache = shm_zone->data;
if (ocache) {
if (ngx_strcmp(cache->path->name.data, ocache->path->name.data) != 0) {
ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
"cache \"%V\" uses the \"%V\" cache path "
"while previously it used the \"%V\" cache path",
&shm_zone->shm.name, &cache->path->name,
&ocache->path->name);
return NGX_ERROR;
}
for (n = 0; n < NGX_MAX_PATH_LEVEL; n++) {
if (cache->path->level[n] != ocache->path->level[n]) {
ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
"cache \"%V\" had previously different levels",
&shm_zone->shm.name);
return NGX_ERROR;
}
}
cache->sh = ocache->sh;
cache->shpool = ocache->shpool;
cache->bsize = ocache->bsize;
cache->max_size /= cache->bsize;
if (!cache->sh->cold || cache->sh->loading) {
cache->path->loader = NULL;
}
return NGX_OK;
}
cache->shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
if (shm_zone->shm.exists) {
cache->sh = cache->shpool->data;
cache->bsize = ngx_fs_bsize(cache->path->name.data);
return NGX_OK;
}
cache->sh = ngx_slab_alloc(cache->shpool, sizeof(ngx_http_file_cache_sh_t));
if (cache->sh == NULL) {
return NGX_ERROR;
}
cache->shpool->data = cache->sh;
ngx_rbtree_init(&cache->sh->rbtree, &cache->sh->sentinel,
ngx_http_file_cache_rbtree_insert_value);
ngx_queue_init(&cache->sh->queue);
cache->sh->cold = 1;
cache->sh->loading = 0;
cache->sh->size = 0;
cache->sh->count = 0;
cache->sh->watermark = (ngx_uint_t) -1;
cache->bsize = ngx_fs_bsize(cache->path->name.data);
cache->max_size /= cache->bsize;
len = sizeof(" in cache keys zone \"\"") + shm_zone->shm.name.len;
cache->shpool->log_ctx = ngx_slab_alloc(cache->shpool, len);
if (cache->shpool->log_ctx == NULL) {
return NGX_ERROR;
}
ngx_sprintf(cache->shpool->log_ctx, " in cache keys zone \"%V\"%Z",
&shm_zone->shm.name);
cache->shpool->log_nomem = 0;
return NGX_OK;
}
ngx_int_t
ngx_http_file_cache_new(ngx_http_request_t *r)
{
ngx_http_cache_t *c;
c = ngx_pcalloc(r->pool, sizeof(ngx_http_cache_t));
if (c == NULL) {
return NGX_ERROR;
}
if (ngx_array_init(&c->keys, r->pool, 4, sizeof(ngx_str_t)) != NGX_OK) {
return NGX_ERROR;
}
r->cache = c;
c->file.log = r->connection->log;
c->file.fd = NGX_INVALID_FILE;
return NGX_OK;
}
ngx_int_t
ngx_http_file_cache_create(ngx_http_request_t *r)
{
ngx_http_cache_t *c;
ngx_pool_cleanup_t *cln;
ngx_http_file_cache_t *cache;
c = r->cache;
cache = c->file_cache;
cln = ngx_pool_cleanup_add(r->pool, 0);
if (cln == NULL) {
return NGX_ERROR;
}
cln->handler = ngx_http_file_cache_cleanup;
cln->data = c;
if (ngx_http_file_cache_exists(cache, c) == NGX_ERROR) {
return NGX_ERROR;
}
if (ngx_http_file_cache_name(r, cache->path) != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
void
ngx_http_file_cache_create_key(ngx_http_request_t *r)
{
size_t len;
ngx_str_t *key;
ngx_uint_t i;
ngx_md5_t md5;
ngx_http_cache_t *c;
c = r->cache;
len = 0;
ngx_crc32_init(c->crc32);
ngx_md5_init(&md5);
key = c->keys.elts;
for (i = 0; i < c->keys.nelts; i++) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http cache key: \"%V\"", &key[i]);
len += key[i].len;
ngx_crc32_update(&c->crc32, key[i].data, key[i].len);
ngx_md5_update(&md5, key[i].data, key[i].len);
}
c->header_start = sizeof(ngx_http_file_cache_header_t)
+ sizeof(ngx_http_file_cache_key) + len + 1;
ngx_crc32_final(c->crc32);
ngx_md5_final(c->key, &md5);
ngx_memcpy(c->main, c->key, NGX_HTTP_CACHE_KEY_LEN);
}
ngx_int_t
ngx_http_file_cache_open(ngx_http_request_t *r)
{
ngx_int_t rc, rv;
ngx_uint_t test;
ngx_http_cache_t *c;
ngx_pool_cleanup_t *cln;
ngx_open_file_info_t of;
ngx_http_file_cache_t *cache;
ngx_http_core_loc_conf_t *clcf;
c = r->cache;
if (c->waiting) {
return NGX_AGAIN;
}
if (c->reading) {
return ngx_http_file_cache_read(r, c);
}
cache = c->file_cache;
if (c->node == NULL) {
cln = ngx_pool_cleanup_add(r->pool, 0);
if (cln == NULL) {
return NGX_ERROR;
}
cln->handler = ngx_http_file_cache_cleanup;
cln->data = c;
}
rc = ngx_http_file_cache_exists(cache, c);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache exists: %i e:%d", rc, c->exists);
if (rc == NGX_ERROR) {
return rc;
}
if (rc == NGX_AGAIN) {
return NGX_HTTP_CACHE_SCARCE;
}
if (rc == NGX_OK) {
if (c->error) {
return c->error;
}
c->temp_file = 1;
test = c->exists ? 1 : 0;
rv = NGX_DECLINED;
} else { /* rc == NGX_DECLINED */
test = cache->sh->cold ? 1 : 0;
if (c->min_uses > 1) {
if (!test) {
return NGX_HTTP_CACHE_SCARCE;
}
rv = NGX_HTTP_CACHE_SCARCE;
} else {
c->temp_file = 1;
rv = NGX_DECLINED;
}
}
if (ngx_http_file_cache_name(r, cache->path) != NGX_OK) {
return NGX_ERROR;
}
if (!test) {
goto done;
}
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
ngx_memzero(&of, sizeof(ngx_open_file_info_t));
of.uniq = c->uniq;
of.valid = clcf->open_file_cache_valid;
of.min_uses = clcf->open_file_cache_min_uses;
of.events = clcf->open_file_cache_events;
of.directio = NGX_OPEN_FILE_DIRECTIO_OFF;
of.read_ahead = clcf->read_ahead;
if (ngx_open_cached_file(clcf->open_file_cache, &c->file.name, &of, r->pool)
!= NGX_OK)
{
switch (of.err) {
case 0:
return NGX_ERROR;
case NGX_ENOENT:
case NGX_ENOTDIR:
goto done;
default:
ngx_log_error(NGX_LOG_CRIT, r->connection->log, of.err,
ngx_open_file_n " \"%s\" failed", c->file.name.data);
return NGX_ERROR;
}
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache fd: %d", of.fd);
c->file.fd = of.fd;
c->file.log = r->connection->log;
c->uniq = of.uniq;
c->length = of.size;
c->fs_size = (of.fs_size + cache->bsize - 1) / cache->bsize;
c->buf = ngx_create_temp_buf(r->pool, c->body_start);
if (c->buf == NULL) {
return NGX_ERROR;
}
return ngx_http_file_cache_read(r, c);
done:
if (rv == NGX_DECLINED) {
return ngx_http_file_cache_lock(r, c);
}
return rv;
}
static ngx_int_t
ngx_http_file_cache_lock(ngx_http_request_t *r, ngx_http_cache_t *c)
{
ngx_msec_t now, timer;
ngx_http_file_cache_t *cache;
if (!c->lock) {
return NGX_DECLINED;
}
now = ngx_current_msec;
cache = c->file_cache;
ngx_shmtx_lock(&cache->shpool->mutex);
timer = c->node->lock_time - now;
if (!c->node->updating || (ngx_msec_int_t) timer <= 0) {
c->node->updating = 1;
c->node->lock_time = now + c->lock_age;
c->updating = 1;
c->lock_time = c->node->lock_time;
}
ngx_shmtx_unlock(&cache->shpool->mutex);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache lock u:%d wt:%M",
c->updating, c->wait_time);
if (c->updating) {
return NGX_DECLINED;
}
if (c->lock_timeout == 0) {
return NGX_HTTP_CACHE_SCARCE;
}
c->waiting = 1;
if (c->wait_time == 0) {
c->wait_time = now + c->lock_timeout;
c->wait_event.handler = ngx_http_file_cache_lock_wait_handler;
c->wait_event.data = r;
c->wait_event.log = r->connection->log;
}
timer = c->wait_time - now;
ngx_add_timer(&c->wait_event, (timer > 500) ? 500 : timer);
r->main->blocked++;
return NGX_AGAIN;
}
static void
ngx_http_file_cache_lock_wait_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_http_request_t *r;
r = ev->data;
c = r->connection;
ngx_http_set_log_request(c->log, r);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http file cache wait: \"%V?%V\"", &r->uri, &r->args);
ngx_http_file_cache_lock_wait(r, r->cache);
ngx_http_run_posted_requests(c);
}
static void
ngx_http_file_cache_lock_wait(ngx_http_request_t *r, ngx_http_cache_t *c)
{
ngx_uint_t wait;
ngx_msec_t now, timer;
ngx_http_file_cache_t *cache;
now = ngx_current_msec;
timer = c->wait_time - now;
if ((ngx_msec_int_t) timer <= 0) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"cache lock timeout");
c->lock_timeout = 0;
goto wakeup;
}
cache = c->file_cache;
wait = 0;
ngx_shmtx_lock(&cache->shpool->mutex);
timer = c->node->lock_time - now;
if (c->node->updating && (ngx_msec_int_t) timer > 0) {
wait = 1;
}
ngx_shmtx_unlock(&cache->shpool->mutex);
if (wait) {
ngx_add_timer(&c->wait_event, (timer > 500) ? 500 : timer);
return;
}
wakeup:
c->waiting = 0;
r->main->blocked--;
r->write_event_handler(r);
}
static ngx_int_t
ngx_http_file_cache_read(ngx_http_request_t *r, ngx_http_cache_t *c)
{
u_char *p;
time_t now;
ssize_t n;
ngx_str_t *key;
ngx_int_t rc;
ngx_uint_t i;
ngx_http_file_cache_t *cache;
ngx_http_file_cache_header_t *h;
n = ngx_http_file_cache_aio_read(r, c);
if (n < 0) {
return n;
}
if ((size_t) n < c->header_start) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" is too small", c->file.name.data);
return NGX_DECLINED;
}
h = (ngx_http_file_cache_header_t *) c->buf->pos;
if (h->version != NGX_HTTP_CACHE_VERSION) {
ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
"cache file \"%s\" version mismatch", c->file.name.data);
return NGX_DECLINED;
}
if (h->crc32 != c->crc32 || (size_t) h->header_start != c->header_start) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" has md5 collision", c->file.name.data);
return NGX_DECLINED;
}
p = c->buf->pos + sizeof(ngx_http_file_cache_header_t)
+ sizeof(ngx_http_file_cache_key);
key = c->keys.elts;
for (i = 0; i < c->keys.nelts; i++) {
if (ngx_memcmp(p, key[i].data, key[i].len) != 0) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" has md5 collision",
c->file.name.data);
return NGX_DECLINED;
}
p += key[i].len;
}
if ((size_t) h->body_start > c->body_start) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" has too long header",
c->file.name.data);
return NGX_DECLINED;
}
if (h->vary_len > NGX_HTTP_CACHE_VARY_LEN) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" has incorrect vary length",
c->file.name.data);
return NGX_DECLINED;
}
if (h->vary_len) {
ngx_http_file_cache_vary(r, h->vary, h->vary_len, c->variant);
if (ngx_memcmp(c->variant, h->variant, NGX_HTTP_CACHE_KEY_LEN) != 0) {
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache vary mismatch");
return ngx_http_file_cache_reopen(r, c);
}
}
c->buf->last += n;
c->valid_sec = h->valid_sec;
c->updating_sec = h->updating_sec;
c->error_sec = h->error_sec;
c->last_modified = h->last_modified;
c->date = h->date;
c->valid_msec = h->valid_msec;
c->body_start = h->body_start;
c->etag.len = h->etag_len;
c->etag.data = h->etag;
r->cached = 1;
cache = c->file_cache;
if (cache->sh->cold) {
ngx_shmtx_lock(&cache->shpool->mutex);
if (!c->node->exists) {
c->node->uses = 1;
c->node->body_start = c->body_start;
c->node->exists = 1;
c->node->uniq = c->uniq;
c->node->fs_size = c->fs_size;
cache->sh->size += c->fs_size;
}
ngx_shmtx_unlock(&cache->shpool->mutex);
}
now = ngx_time();
if (c->valid_sec < now) {
c->stale_updating = c->valid_sec + c->updating_sec >= now;
c->stale_error = c->valid_sec + c->error_sec >= now;
ngx_shmtx_lock(&cache->shpool->mutex);
if (c->node->updating) {
rc = NGX_HTTP_CACHE_UPDATING;
} else {
c->node->updating = 1;
c->updating = 1;
c->lock_time = c->node->lock_time;
rc = NGX_HTTP_CACHE_STALE;
}
ngx_shmtx_unlock(&cache->shpool->mutex);
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache expired: %i %T %T",
rc, c->valid_sec, now);
return rc;
}
return NGX_OK;
}
static ssize_t
ngx_http_file_cache_aio_read(ngx_http_request_t *r, ngx_http_cache_t *c)
{
#if (NGX_HAVE_FILE_AIO || NGX_THREADS)
ssize_t n;
ngx_http_core_loc_conf_t *clcf;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
#endif
#if (NGX_HAVE_FILE_AIO)
if (clcf->aio == NGX_HTTP_AIO_ON && ngx_file_aio) {
n = ngx_file_aio_read(&c->file, c->buf->pos, c->body_start, 0, r->pool);
if (n != NGX_AGAIN) {
c->reading = 0;
return n;
}
c->reading = 1;
c->file.aio->data = r;
c->file.aio->handler = ngx_http_cache_aio_event_handler;
r->main->blocked++;
r->aio = 1;
return NGX_AGAIN;
}
#endif
#if (NGX_THREADS)
if (clcf->aio == NGX_HTTP_AIO_THREADS) {
c->file.thread_task = c->thread_task;
c->file.thread_handler = ngx_http_cache_thread_handler;
c->file.thread_ctx = r;
n = ngx_thread_read(&c->file, c->buf->pos, c->body_start, 0, r->pool);
c->thread_task = c->file.thread_task;
c->reading = (n == NGX_AGAIN);
return n;
}
#endif
return ngx_read_file(&c->file, c->buf->pos, c->body_start, 0);
}
#if (NGX_HAVE_FILE_AIO)
static void
ngx_http_cache_aio_event_handler(ngx_event_t *ev)
{
ngx_event_aio_t *aio;
ngx_connection_t *c;
ngx_http_request_t *r;
aio = ev->data;
r = aio->data;
c = r->connection;
ngx_http_set_log_request(c->log, r);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http file cache aio: \"%V?%V\"", &r->uri, &r->args);
r->main->blocked--;
r->aio = 0;
r->write_event_handler(r);
ngx_http_run_posted_requests(c);
}
#endif
#if (NGX_THREADS)
static ngx_int_t
ngx_http_cache_thread_handler(ngx_thread_task_t *task, ngx_file_t *file)
{
ngx_str_t name;
ngx_thread_pool_t *tp;
ngx_http_request_t *r;
ngx_http_core_loc_conf_t *clcf;
r = file->thread_ctx;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
tp = clcf->thread_pool;
if (tp == NULL) {
if (ngx_http_complex_value(r, clcf->thread_pool_value, &name)
!= NGX_OK)
{
return NGX_ERROR;
}
tp = ngx_thread_pool_get((ngx_cycle_t *) ngx_cycle, &name);
if (tp == NULL) {
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"thread pool \"%V\" not found", &name);
return NGX_ERROR;
}
}
task->event.data = r;
task->event.handler = ngx_http_cache_thread_event_handler;
if (ngx_thread_task_post(tp, task) != NGX_OK) {
return NGX_ERROR;
}
r->main->blocked++;
r->aio = 1;
return NGX_OK;
}
static void
ngx_http_cache_thread_event_handler(ngx_event_t *ev)
{
ngx_connection_t *c;
ngx_http_request_t *r;
r = ev->data;
c = r->connection;
ngx_http_set_log_request(c->log, r);
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http file cache thread: \"%V?%V\"", &r->uri, &r->args);
r->main->blocked--;
r->aio = 0;
r->write_event_handler(r);
ngx_http_run_posted_requests(c);
}
#endif
static ngx_int_t
ngx_http_file_cache_exists(ngx_http_file_cache_t *cache, ngx_http_cache_t *c)
{
ngx_int_t rc;
ngx_http_file_cache_node_t *fcn;
ngx_shmtx_lock(&cache->shpool->mutex);
fcn = c->node;
if (fcn == NULL) {
fcn = ngx_http_file_cache_lookup(cache, c->key);
}
if (fcn) {
ngx_queue_remove(&fcn->queue);
if (c->node == NULL) {
fcn->uses++;
fcn->count++;
}
if (fcn->error) {
if (fcn->valid_sec < ngx_time()) {
goto renew;
}
rc = NGX_OK;
goto done;
}
if (fcn->exists || fcn->uses >= c->min_uses) {
c->exists = fcn->exists;
if (fcn->body_start) {
c->body_start = fcn->body_start;
}
rc = NGX_OK;
goto done;
}
rc = NGX_AGAIN;
goto done;
}
fcn = ngx_slab_calloc_locked(cache->shpool,
sizeof(ngx_http_file_cache_node_t));
if (fcn == NULL) {
ngx_http_file_cache_set_watermark(cache);
ngx_shmtx_unlock(&cache->shpool->mutex);
(void) ngx_http_file_cache_forced_expire(cache);
ngx_shmtx_lock(&cache->shpool->mutex);
fcn = ngx_slab_calloc_locked(cache->shpool,
sizeof(ngx_http_file_cache_node_t));
if (fcn == NULL) {
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"could not allocate node%s", cache->shpool->log_ctx);
rc = NGX_ERROR;
goto failed;
}
}
cache->sh->count++;
ngx_memcpy((u_char *) &fcn->node.key, c->key, sizeof(ngx_rbtree_key_t));
ngx_memcpy(fcn->key, &c->key[sizeof(ngx_rbtree_key_t)],
NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t));
ngx_rbtree_insert(&cache->sh->rbtree, &fcn->node);
fcn->uses = 1;
fcn->count = 1;
renew:
rc = NGX_DECLINED;
fcn->valid_msec = 0;
fcn->error = 0;
fcn->exists = 0;
fcn->valid_sec = 0;
fcn->uniq = 0;
fcn->body_start = 0;
fcn->fs_size = 0;
done:
fcn->expire = ngx_time() + cache->inactive;
ngx_queue_insert_head(&cache->sh->queue, &fcn->queue);
c->uniq = fcn->uniq;
c->error = fcn->error;
c->node = fcn;
failed:
ngx_shmtx_unlock(&cache->shpool->mutex);
return rc;
}
static ngx_int_t
ngx_http_file_cache_name(ngx_http_request_t *r, ngx_path_t *path)
{
u_char *p;
ngx_http_cache_t *c;
c = r->cache;
if (c->file.name.len) {
return NGX_OK;
}
c->file.name.len = path->name.len + 1 + path->len
+ 2 * NGX_HTTP_CACHE_KEY_LEN;
c->file.name.data = ngx_pnalloc(r->pool, c->file.name.len + 1);
if (c->file.name.data == NULL) {
return NGX_ERROR;
}
ngx_memcpy(c->file.name.data, path->name.data, path->name.len);
p = c->file.name.data + path->name.len + 1 + path->len;
p = ngx_hex_dump(p, c->key, NGX_HTTP_CACHE_KEY_LEN);
*p = '\0';
ngx_create_hashed_filename(path, c->file.name.data, c->file.name.len);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"cache file: \"%s\"", c->file.name.data);
return NGX_OK;
}
static ngx_http_file_cache_node_t *
ngx_http_file_cache_lookup(ngx_http_file_cache_t *cache, u_char *key)
{
ngx_int_t rc;
ngx_rbtree_key_t node_key;
ngx_rbtree_node_t *node, *sentinel;
ngx_http_file_cache_node_t *fcn;
ngx_memcpy((u_char *) &node_key, key, sizeof(ngx_rbtree_key_t));
node = cache->sh->rbtree.root;
sentinel = cache->sh->rbtree.sentinel;
while (node != sentinel) {
if (node_key < node->key) {
node = node->left;
continue;
}
if (node_key > node->key) {
node = node->right;
continue;
}
/* node_key == node->key */
fcn = (ngx_http_file_cache_node_t *) node;
rc = ngx_memcmp(&key[sizeof(ngx_rbtree_key_t)], fcn->key,
NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t));
if (rc == 0) {
return fcn;
}
node = (rc < 0) ? node->left : node->right;
}
/* not found */
return NULL;
}
static void
ngx_http_file_cache_rbtree_insert_value(ngx_rbtree_node_t *temp,
ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
{
ngx_rbtree_node_t **p;
ngx_http_file_cache_node_t *cn, *cnt;
for ( ;; ) {
if (node->key < temp->key) {
p = &temp->left;
} else if (node->key > temp->key) {
p = &temp->right;
} else { /* node->key == temp->key */
cn = (ngx_http_file_cache_node_t *) node;
cnt = (ngx_http_file_cache_node_t *) temp;
p = (ngx_memcmp(cn->key, cnt->key,
NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t))
< 0)
? &temp->left : &temp->right;
}
if (*p == sentinel) {
break;
}
temp = *p;
}
*p = node;
node->parent = temp;
node->left = sentinel;
node->right = sentinel;
ngx_rbt_red(node);
}
static void
ngx_http_file_cache_vary(ngx_http_request_t *r, u_char *vary, size_t len,
u_char *hash)
{
u_char *p, *last;
ngx_str_t name;
ngx_md5_t md5;
u_char buf[NGX_HTTP_CACHE_VARY_LEN];
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache vary: \"%*s\"", len, vary);
ngx_md5_init(&md5);
ngx_md5_update(&md5, r->cache->main, NGX_HTTP_CACHE_KEY_LEN);
ngx_strlow(buf, vary, len);
p = buf;
last = buf + len;
while (p < last) {
while (p < last && (*p == ' ' || *p == ',')) { p++; }
name.data = p;
while (p < last && *p != ',' && *p != ' ') { p++; }
name.len = p - name.data;
if (name.len == 0) {
break;
}
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache vary: %V", &name);
ngx_md5_update(&md5, name.data, name.len);
ngx_md5_update(&md5, (u_char *) ":", sizeof(":") - 1);
ngx_http_file_cache_vary_header(r, &md5, &name);
ngx_md5_update(&md5, (u_char *) CRLF, sizeof(CRLF) - 1);
}
ngx_md5_final(hash, &md5);
}
static void
ngx_http_file_cache_vary_header(ngx_http_request_t *r, ngx_md5_t *md5,
ngx_str_t *name)
{
size_t len;
u_char *p, *start, *last;
ngx_uint_t i, multiple, normalize;
ngx_list_part_t *part;
ngx_table_elt_t *header;
multiple = 0;
normalize = 0;
if (name->len == sizeof("Accept-Charset") - 1
&& ngx_strncasecmp(name->data, (u_char *) "Accept-Charset",
sizeof("Accept-Charset") - 1) == 0)
{
normalize = 1;
} else if (name->len == sizeof("Accept-Encoding") - 1
&& ngx_strncasecmp(name->data, (u_char *) "Accept-Encoding",
sizeof("Accept-Encoding") - 1) == 0)
{
normalize = 1;
} else if (name->len == sizeof("Accept-Language") - 1
&& ngx_strncasecmp(name->data, (u_char *) "Accept-Language",
sizeof("Accept-Language") - 1) == 0)
{
normalize = 1;
}
part = &r->headers_in.headers.part;
header = part->elts;
for (i = 0; /* void */ ; i++) {
if (i >= part->nelts) {
if (part->next == NULL) {
break;
}
part = part->next;
header = part->elts;
i = 0;
}
if (header[i].hash == 0) {
continue;
}
if (header[i].key.len != name->len) {
continue;
}
if (ngx_strncasecmp(header[i].key.data, name->data, name->len) != 0) {
continue;
}
if (!normalize) {
if (multiple) {
ngx_md5_update(md5, (u_char *) ",", sizeof(",") - 1);
}
ngx_md5_update(md5, header[i].value.data, header[i].value.len);
multiple = 1;
continue;
}
/* normalize spaces */
p = header[i].value.data;
last = p + header[i].value.len;
while (p < last) {
while (p < last && (*p == ' ' || *p == ',')) { p++; }
start = p;
while (p < last && *p != ',' && *p != ' ') { p++; }
len = p - start;
if (len == 0) {
break;
}
if (multiple) {
ngx_md5_update(md5, (u_char *) ",", sizeof(",") - 1);
}
ngx_md5_update(md5, start, len);
multiple = 1;
}
}
}
static ngx_int_t
ngx_http_file_cache_reopen(ngx_http_request_t *r, ngx_http_cache_t *c)
{
ngx_http_file_cache_t *cache;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->file.log, 0,
"http file cache reopen");
if (c->secondary) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
"cache file \"%s\" has incorrect vary hash",
c->file.name.data);
return NGX_DECLINED;
}
cache = c->file_cache;
ngx_shmtx_lock(&cache->shpool->mutex);
c->node->count--;
c->node = NULL;
ngx_shmtx_unlock(&cache->shpool->mutex);
c->secondary = 1;
c->file.name.len = 0;
c->body_start = c->buf->end - c->buf->start;
ngx_memcpy(c->key, c->variant, NGX_HTTP_CACHE_KEY_LEN);
return ngx_http_file_cache_open(r);
}
ngx_int_t
ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf)
{
ngx_http_file_cache_header_t *h = (ngx_http_file_cache_header_t *) buf;
u_char *p;
ngx_str_t *key;
ngx_uint_t i;
ngx_http_cache_t *c;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache set header");
c = r->cache;
ngx_memzero(h, sizeof(ngx_http_file_cache_header_t));
h->version = NGX_HTTP_CACHE_VERSION;
h->valid_sec = c->valid_sec;
h->updating_sec = c->updating_sec;
h->error_sec = c->error_sec;
h->last_modified = c->last_modified;
h->date = c->date;
h->crc32 = c->crc32;
h->valid_msec = (u_short) c->valid_msec;
h->header_start = (u_short) c->header_start;
h->body_start = (u_short) c->body_start;
if (c->etag.len <= NGX_HTTP_CACHE_ETAG_LEN) {
h->etag_len = (u_char) c->etag.len;
ngx_memcpy(h->etag, c->etag.data, c->etag.len);
}
if (c->vary.len) {
if (c->vary.len > NGX_HTTP_CACHE_VARY_LEN) {
/* should not happen */
c->vary.len = NGX_HTTP_CACHE_VARY_LEN;
}
h->vary_len = (u_char) c->vary.len;
ngx_memcpy(h->vary, c->vary.data, c->vary.len);
ngx_http_file_cache_vary(r, c->vary.data, c->vary.len, c->variant);
ngx_memcpy(h->variant, c->variant, NGX_HTTP_CACHE_KEY_LEN);
}
if (ngx_http_file_cache_update_variant(r, c) != NGX_OK) {
return NGX_ERROR;
}
p = buf + sizeof(ngx_http_file_cache_header_t);
p = ngx_cpymem(p, ngx_http_file_cache_key, sizeof(ngx_http_file_cache_key));
key = c->keys.elts;
for (i = 0; i < c->keys.nelts; i++) {
p = ngx_copy(p, key[i].data, key[i].len);
}
*p = LF;
return NGX_OK;
}
static ngx_int_t
ngx_http_file_cache_update_variant(ngx_http_request_t *r, ngx_http_cache_t *c)
{
ngx_http_file_cache_t *cache;
if (!c->secondary) {
return NGX_OK;
}
if (c->vary.len
&& ngx_memcmp(c->variant, c->key, NGX_HTTP_CACHE_KEY_LEN) == 0)
{
return NGX_OK;
}
/*
* if the variant hash doesn't match one we used as a secondary
* cache key, switch back to the original key
*/
cache = c->file_cache;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache main key");
ngx_shmtx_lock(&cache->shpool->mutex);
c->node->count--;
c->node->updating = 0;
c->node = NULL;
ngx_shmtx_unlock(&cache->shpool->mutex);
c->file.name.len = 0;
ngx_memcpy(c->key, c->main, NGX_HTTP_CACHE_KEY_LEN);
if (ngx_http_file_cache_exists(cache, c) == NGX_ERROR) {
return NGX_ERROR;
}
if (ngx_http_file_cache_name(r, cache->path) != NGX_OK) {
return NGX_ERROR;
}
return NGX_OK;
}
void
ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf)
{
off_t fs_size;
ngx_int_t rc;
ngx_file_uniq_t uniq;
ngx_file_info_t fi;
ngx_http_cache_t *c;
ngx_ext_rename_file_t ext;
ngx_http_file_cache_t *cache;
c = r->cache;
if (c->updated) {
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache update");
cache = c->file_cache;
c->updated = 1;
c->updating = 0;
uniq = 0;
fs_size = 0;
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache rename: \"%s\" to \"%s\"",
tf->file.name.data, c->file.name.data);
ext.access = NGX_FILE_OWNER_ACCESS;
ext.path_access = NGX_FILE_OWNER_ACCESS;
ext.time = -1;
ext.create_path = 1;
ext.delete_file = 1;
ext.log = r->connection->log;
rc = ngx_ext_rename_file(&tf->file.name, &c->file.name, &ext);
if (rc == NGX_OK) {
if (ngx_fd_info(tf->file.fd, &fi) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_fd_info_n " \"%s\" failed", tf->file.name.data);
rc = NGX_ERROR;
} else {
uniq = ngx_file_uniq(&fi);
fs_size = (ngx_file_fs_size(&fi) + cache->bsize - 1) / cache->bsize;
}
}
ngx_shmtx_lock(&cache->shpool->mutex);
c->node->count--;
c->node->error = 0;
c->node->uniq = uniq;
c->node->body_start = c->body_start;
cache->sh->size += fs_size - c->node->fs_size;
c->node->fs_size = fs_size;
if (rc == NGX_OK) {
c->node->exists = 1;
}
c->node->updating = 0;
ngx_shmtx_unlock(&cache->shpool->mutex);
}
void
ngx_http_file_cache_update_header(ngx_http_request_t *r)
{
ssize_t n;
ngx_err_t err;
ngx_file_t file;
ngx_file_info_t fi;
ngx_http_cache_t *c;
ngx_http_file_cache_header_t h;
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache update header");
c = r->cache;
ngx_memzero(&file, sizeof(ngx_file_t));
file.name = c->file.name;
file.log = r->connection->log;
file.fd = ngx_open_file(file.name.data, NGX_FILE_RDWR, NGX_FILE_OPEN, 0);
if (file.fd == NGX_INVALID_FILE) {
err = ngx_errno;
/* cache file may have been deleted */
if (err == NGX_ENOENT) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache \"%s\" not found",
file.name.data);
return;
}
ngx_log_error(NGX_LOG_CRIT, r->connection->log, err,
ngx_open_file_n " \"%s\" failed", file.name.data);
return;
}
/*
* make sure cache file wasn't replaced;
* if it was, do nothing
*/
if (ngx_fd_info(file.fd, &fi) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, ngx_errno,
ngx_fd_info_n " \"%s\" failed", file.name.data);
goto done;
}
if (c->uniq != ngx_file_uniq(&fi)
|| c->length != ngx_file_size(&fi))
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache \"%s\" changed",
file.name.data);
goto done;
}
n = ngx_read_file(&file, (u_char *) &h,
sizeof(ngx_http_file_cache_header_t), 0);
if (n == NGX_ERROR) {
goto done;
}
if ((size_t) n != sizeof(ngx_http_file_cache_header_t)) {
ngx_log_error(NGX_LOG_CRIT, r->connection->log, 0,
ngx_read_file_n " read only %z of %z from \"%s\"",
n, sizeof(ngx_http_file_cache_header_t), file.name.data);
goto done;
}
if (h.version != NGX_HTTP_CACHE_VERSION
|| h.last_modified != c->last_modified
|| h.crc32 != c->crc32
|| (size_t) h.header_start != c->header_start
|| (size_t) h.body_start != c->body_start)
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache \"%s\" content changed",
file.name.data);
goto done;
}
/*
* update cache file header with new data,
* notably h.valid_sec and h.date
*/
ngx_memzero(&h, sizeof(ngx_http_file_cache_header_t));
h.version = NGX_HTTP_CACHE_VERSION;
h.valid_sec = c->valid_sec;
h.updating_sec = c->updating_sec;
h.error_sec = c->error_sec;
h.last_modified = c->last_modified;
h.date = c->date;
h.crc32 = c->crc32;
h.valid_msec = (u_short) c->valid_msec;
h.header_start = (u_short) c->header_start;
h.body_start = (u_short) c->body_start;
if (c->etag.len <= NGX_HTTP_CACHE_ETAG_LEN) {
h.etag_len = (u_char) c->etag.len;
ngx_memcpy(h.etag, c->etag.data, c->etag.len);
}
if (c->vary.len) {
if (c->vary.len > NGX_HTTP_CACHE_VARY_LEN) {
/* should not happen */
c->vary.len = NGX_HTTP_CACHE_VARY_LEN;
}
h.vary_len = (u_char) c->vary.len;
ngx_memcpy(h.vary, c->vary.data, c->vary.len);
ngx_http_file_cache_vary(r, c->vary.data, c->vary.len, c->variant);
ngx_memcpy(h.variant, c->variant, NGX_HTTP_CACHE_KEY_LEN);
}
(void) ngx_write_file(&file, (u_char *) &h,
sizeof(ngx_http_file_cache_header_t), 0);
done:
if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_ALERT, r->connection->log, ngx_errno,
ngx_close_file_n " \"%s\" failed", file.name.data);
}
}
ngx_int_t
ngx_http_cache_send(ngx_http_request_t *r)
{
ngx_int_t rc;
ngx_buf_t *b;
ngx_chain_t out;
ngx_http_cache_t *c;
c = r->cache;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http file cache send: %s", c->file.name.data);
if (r != r->main && c->length - c->body_start == 0) {
return ngx_http_send_header(r);
}
/* we need to allocate all before the header would be sent */
b = ngx_calloc_buf(r->pool);
if (b == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
b->file = ngx_pcalloc(r->pool, sizeof(ngx_file_t));
if (b->file == NULL) {
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
rc = ngx_http_send_header(r);
if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
return rc;
}
b->file_pos = c->body_start;
b->file_last = c->length;
b->in_file = (c->length - c->body_start) ? 1: 0;
b->last_buf = (r == r->main) ? 1: 0;
b->last_in_chain = 1;
b->file->fd = c->file.fd;
b->file->name = c->file.name;
b->file->log = r->connection->log;
out.buf = b;
out.next = NULL;
return ngx_http_output_filter(r, &out);
}
void
ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf)
{
ngx_http_file_cache_t *cache;
ngx_http_file_cache_node_t *fcn;
if (c->updated || c->node == NULL) {
return;
}
cache = c->file_cache;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->file.log, 0,
"http file cache free, fd: %d", c->file.fd);
ngx_shmtx_lock(&cache->shpool->mutex);
fcn = c->node;
fcn->count--;
if (c->updating && fcn->lock_time == c->lock_time) {
fcn->updating = 0;
}
if (c->error) {
fcn->error = c->error;
if (c->valid_sec) {
fcn->valid_sec = c->valid_sec;
fcn->valid_msec = c->valid_msec;
}
} else if (!fcn->exists && fcn->count == 0 && c->min_uses == 1) {
ngx_queue_remove(&fcn->queue);
ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
ngx_slab_free_locked(cache->shpool, fcn);
cache->sh->count--;
c->node = NULL;
}
ngx_shmtx_unlock(&cache->shpool->mutex);
c->updated = 1;
c->updating = 0;
if (c->temp_file) {
if (tf && tf->file.fd != NGX_INVALID_FILE) {
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->file.log, 0,
"http file cache incomplete: \"%s\"",
tf->file.name.data);
if (ngx_delete_file(tf->file.name.data) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, c->file.log, ngx_errno,
ngx_delete_file_n " \"%s\" failed",
tf->file.name.data);
}
}
}
if (c->wait_event.timer_set) {
ngx_del_timer(&c->wait_event);
}
}
static void
ngx_http_file_cache_cleanup(void *data)
{
ngx_http_cache_t *c = data;
if (c->updated) {
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->file.log, 0,
"http file cache cleanup");
if (c->updating && !c->background) {
ngx_log_error(NGX_LOG_ALERT, c->file.log, 0,
"stalled cache updating, error:%ui", c->error);
}
ngx_http_file_cache_free(c, NULL);
}
static time_t
ngx_http_file_cache_forced_expire(ngx_http_file_cache_t *cache)
{
u_char *name, *p;
size_t len;
time_t wait;
ngx_uint_t tries;
ngx_path_t *path;
ngx_queue_t *q, *sentinel;
ngx_http_file_cache_node_t *fcn;
u_char key[2 * NGX_HTTP_CACHE_KEY_LEN];
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache forced expire");
path = cache->path;
len = path->name.len + 1 + path->len + 2 * NGX_HTTP_CACHE_KEY_LEN;
name = ngx_alloc(len + 1, ngx_cycle->log);
if (name == NULL) {
return 10;
}
ngx_memcpy(name, path->name.data, path->name.len);
wait = 10;
tries = 20;
sentinel = NULL;
ngx_shmtx_lock(&cache->shpool->mutex);
for ( ;; ) {
if (ngx_queue_empty(&cache->sh->queue)) {
break;
}
q = ngx_queue_last(&cache->sh->queue);
if (q == sentinel) {
break;
}
fcn = ngx_queue_data(q, ngx_http_file_cache_node_t, queue);
ngx_log_debug6(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache forced expire: #%d %d %02xd%02xd%02xd%02xd",
fcn->count, fcn->exists,
fcn->key[0], fcn->key[1], fcn->key[2], fcn->key[3]);
if (fcn->count == 0) {
ngx_http_file_cache_delete(cache, q, name);
wait = 0;
break;
}
p = ngx_hex_dump(key, (u_char *) &fcn->node.key,
sizeof(ngx_rbtree_key_t));
len = NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t);
(void) ngx_hex_dump(p, fcn->key, len);
/*
* abnormally exited workers may leave locked cache entries,
* and although it may be safe to remove them completely,
* we prefer to just move them to the top of the inactive queue
*/
ngx_queue_remove(q);
fcn->expire = ngx_time() + cache->inactive;
ngx_queue_insert_head(&cache->sh->queue, &fcn->queue);
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"ignore long locked inactive cache entry %*s, count:%d",
(size_t) 2 * NGX_HTTP_CACHE_KEY_LEN, key, fcn->count);
if (sentinel == NULL) {
sentinel = q;
}
if (--tries) {
continue;
}
wait = 1;
break;
}
ngx_shmtx_unlock(&cache->shpool->mutex);
ngx_free(name);
return wait;
}
static time_t
ngx_http_file_cache_expire(ngx_http_file_cache_t *cache)
{
u_char *name, *p;
size_t len;
time_t now, wait;
ngx_path_t *path;
ngx_msec_t elapsed;
ngx_queue_t *q;
ngx_http_file_cache_node_t *fcn;
u_char key[2 * NGX_HTTP_CACHE_KEY_LEN];
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache expire");
path = cache->path;
len = path->name.len + 1 + path->len + 2 * NGX_HTTP_CACHE_KEY_LEN;
name = ngx_alloc(len + 1, ngx_cycle->log);
if (name == NULL) {
return 10;
}
ngx_memcpy(name, path->name.data, path->name.len);
now = ngx_time();
ngx_shmtx_lock(&cache->shpool->mutex);
for ( ;; ) {
if (ngx_quit || ngx_terminate) {
wait = 1;
break;
}
if (ngx_queue_empty(&cache->sh->queue)) {
wait = 10;
break;
}
q = ngx_queue_last(&cache->sh->queue);
fcn = ngx_queue_data(q, ngx_http_file_cache_node_t, queue);
wait = fcn->expire - now;
if (wait > 0) {
wait = wait > 10 ? 10 : wait;
break;
}
ngx_log_debug6(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache expire: #%d %d %02xd%02xd%02xd%02xd",
fcn->count, fcn->exists,
fcn->key[0], fcn->key[1], fcn->key[2], fcn->key[3]);
if (fcn->count == 0) {
ngx_http_file_cache_delete(cache, q, name);
goto next;
}
if (fcn->deleting) {
wait = 1;
break;
}
p = ngx_hex_dump(key, (u_char *) &fcn->node.key,
sizeof(ngx_rbtree_key_t));
len = NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t);
(void) ngx_hex_dump(p, fcn->key, len);
/*
* abnormally exited workers may leave locked cache entries,
* and although it may be safe to remove them completely,
* we prefer to just move them to the top of the inactive queue
*/
ngx_queue_remove(q);
fcn->expire = ngx_time() + cache->inactive;
ngx_queue_insert_head(&cache->sh->queue, &fcn->queue);
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"ignore long locked inactive cache entry %*s, count:%d",
(size_t) 2 * NGX_HTTP_CACHE_KEY_LEN, key, fcn->count);
next:
if (++cache->files >= cache->manager_files) {
wait = 0;
break;
}
ngx_time_update();
elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last));
if (elapsed >= cache->manager_threshold) {
wait = 0;
break;
}
}
ngx_shmtx_unlock(&cache->shpool->mutex);
ngx_free(name);
return wait;
}
static void
ngx_http_file_cache_delete(ngx_http_file_cache_t *cache, ngx_queue_t *q,
u_char *name)
{
u_char *p;
size_t len;
ngx_path_t *path;
ngx_http_file_cache_node_t *fcn;
fcn = ngx_queue_data(q, ngx_http_file_cache_node_t, queue);
if (fcn->exists) {
cache->sh->size -= fcn->fs_size;
path = cache->path;
p = name + path->name.len + 1 + path->len;
p = ngx_hex_dump(p, (u_char *) &fcn->node.key,
sizeof(ngx_rbtree_key_t));
len = NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t);
p = ngx_hex_dump(p, fcn->key, len);
*p = '\0';
fcn->count++;
fcn->deleting = 1;
ngx_shmtx_unlock(&cache->shpool->mutex);
len = path->name.len + 1 + path->len + 2 * NGX_HTTP_CACHE_KEY_LEN;
ngx_create_hashed_filename(path, name, len);
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache expire: \"%s\"", name);
if (ngx_delete_file(name) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, ngx_cycle->log, ngx_errno,
ngx_delete_file_n " \"%s\" failed", name);
}
ngx_shmtx_lock(&cache->shpool->mutex);
fcn->count--;
fcn->deleting = 0;
}
if (fcn->count == 0) {
ngx_queue_remove(q);
ngx_rbtree_delete(&cache->sh->rbtree, &fcn->node);
ngx_slab_free_locked(cache->shpool, fcn);
cache->sh->count--;
}
}
static ngx_msec_t
ngx_http_file_cache_manager(void *data)
{
ngx_http_file_cache_t *cache = data;
off_t size;
time_t wait;
ngx_msec_t elapsed, next;
ngx_uint_t count, watermark;
cache->last = ngx_current_msec;
cache->files = 0;
next = (ngx_msec_t) ngx_http_file_cache_expire(cache) * 1000;
if (next == 0) {
next = cache->manager_sleep;
goto done;
}
for ( ;; ) {
ngx_shmtx_lock(&cache->shpool->mutex);
size = cache->sh->size;
count = cache->sh->count;
watermark = cache->sh->watermark;
ngx_shmtx_unlock(&cache->shpool->mutex);
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache size: %O c:%ui w:%i",
size, count, (ngx_int_t) watermark);
if (size < cache->max_size && count < watermark) {
break;
}
wait = ngx_http_file_cache_forced_expire(cache);
if (wait > 0) {
next = (ngx_msec_t) wait * 1000;
break;
}
if (ngx_quit || ngx_terminate) {
break;
}
if (++cache->files >= cache->manager_files) {
next = cache->manager_sleep;
break;
}
ngx_time_update();
elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last));
if (elapsed >= cache->manager_threshold) {
next = cache->manager_sleep;
break;
}
}
done:
elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last));
ngx_log_debug3(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache manager: %ui e:%M n:%M",
cache->files, elapsed, next);
return next;
}
static void
ngx_http_file_cache_loader(void *data)
{
ngx_http_file_cache_t *cache = data;
ngx_tree_ctx_t tree;
if (!cache->sh->cold || cache->sh->loading) {
return;
}
if (!ngx_atomic_cmp_set(&cache->sh->loading, 0, ngx_pid)) {
return;
}
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache loader");
tree.init_handler = NULL;
tree.file_handler = ngx_http_file_cache_manage_file;
tree.pre_tree_handler = ngx_http_file_cache_manage_directory;
tree.post_tree_handler = ngx_http_file_cache_noop;
tree.spec_handler = ngx_http_file_cache_delete_file;
tree.data = cache;
tree.alloc = 0;
tree.log = ngx_cycle->log;
cache->last = ngx_current_msec;
cache->files = 0;
if (ngx_walk_tree(&tree, &cache->path->name) == NGX_ABORT) {
cache->sh->loading = 0;
return;
}
cache->sh->cold = 0;
cache->sh->loading = 0;
ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0,
"http file cache: %V %.3fM, bsize: %uz",
&cache->path->name,
((double) cache->sh->size * cache->bsize) / (1024 * 1024),
cache->bsize);
}
static ngx_int_t
ngx_http_file_cache_noop(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
return NGX_OK;
}
static ngx_int_t
ngx_http_file_cache_manage_file(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
ngx_msec_t elapsed;
ngx_http_file_cache_t *cache;
cache = ctx->data;
if (ngx_http_file_cache_add_file(ctx, path) != NGX_OK) {
(void) ngx_http_file_cache_delete_file(ctx, path);
}
if (++cache->files >= cache->loader_files) {
ngx_http_file_cache_loader_sleep(cache);
} else {
ngx_time_update();
elapsed = ngx_abs((ngx_msec_int_t) (ngx_current_msec - cache->last));
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache loader time elapsed: %M", elapsed);
if (elapsed >= cache->loader_threshold) {
ngx_http_file_cache_loader_sleep(cache);
}
}
return (ngx_quit || ngx_terminate) ? NGX_ABORT : NGX_OK;
}
static ngx_int_t
ngx_http_file_cache_manage_directory(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
if (path->len >= 5
&& ngx_strncmp(path->data + path->len - 5, "/temp", 5) == 0)
{
return NGX_DECLINED;
}
return NGX_OK;
}
static void
ngx_http_file_cache_loader_sleep(ngx_http_file_cache_t *cache)
{
ngx_msleep(cache->loader_sleep);
ngx_time_update();
cache->last = ngx_current_msec;
cache->files = 0;
}
static ngx_int_t
ngx_http_file_cache_add_file(ngx_tree_ctx_t *ctx, ngx_str_t *name)
{
u_char *p;
ngx_int_t n;
ngx_uint_t i;
ngx_http_cache_t c;
ngx_http_file_cache_t *cache;
if (name->len < 2 * NGX_HTTP_CACHE_KEY_LEN) {
return NGX_ERROR;
}
/*
* Temporary files in cache have a suffix consisting of a dot
* followed by 10 digits.
*/
if (name->len >= 2 * NGX_HTTP_CACHE_KEY_LEN + 1 + 10
&& name->data[name->len - 10 - 1] == '.')
{
return NGX_OK;
}
if (ctx->size < (off_t) sizeof(ngx_http_file_cache_header_t)) {
ngx_log_error(NGX_LOG_CRIT, ctx->log, 0,
"cache file \"%s\" is too small", name->data);
return NGX_ERROR;
}
ngx_memzero(&c, sizeof(ngx_http_cache_t));
cache = ctx->data;
c.length = ctx->size;
c.fs_size = (ctx->fs_size + cache->bsize - 1) / cache->bsize;
p = &name->data[name->len - 2 * NGX_HTTP_CACHE_KEY_LEN];
for (i = 0; i < NGX_HTTP_CACHE_KEY_LEN; i++) {
n = ngx_hextoi(p, 2);
if (n == NGX_ERROR) {
return NGX_ERROR;
}
p += 2;
c.key[i] = (u_char) n;
}
return ngx_http_file_cache_add(cache, &c);
}
static ngx_int_t
ngx_http_file_cache_add(ngx_http_file_cache_t *cache, ngx_http_cache_t *c)
{
ngx_http_file_cache_node_t *fcn;
ngx_shmtx_lock(&cache->shpool->mutex);
fcn = ngx_http_file_cache_lookup(cache, c->key);
if (fcn == NULL) {
fcn = ngx_slab_calloc_locked(cache->shpool,
sizeof(ngx_http_file_cache_node_t));
if (fcn == NULL) {
ngx_http_file_cache_set_watermark(cache);
if (cache->fail_time != ngx_time()) {
cache->fail_time = ngx_time();
ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, 0,
"could not allocate node%s", cache->shpool->log_ctx);
}
ngx_shmtx_unlock(&cache->shpool->mutex);
return NGX_ERROR;
}
cache->sh->count++;
ngx_memcpy((u_char *) &fcn->node.key, c->key, sizeof(ngx_rbtree_key_t));
ngx_memcpy(fcn->key, &c->key[sizeof(ngx_rbtree_key_t)],
NGX_HTTP_CACHE_KEY_LEN - sizeof(ngx_rbtree_key_t));
ngx_rbtree_insert(&cache->sh->rbtree, &fcn->node);
fcn->uses = 1;
fcn->exists = 1;
fcn->fs_size = c->fs_size;
cache->sh->size += c->fs_size;
} else {
ngx_queue_remove(&fcn->queue);
}
fcn->expire = ngx_time() + cache->inactive;
ngx_queue_insert_head(&cache->sh->queue, &fcn->queue);
ngx_shmtx_unlock(&cache->shpool->mutex);
return NGX_OK;
}
static ngx_int_t
ngx_http_file_cache_delete_file(ngx_tree_ctx_t *ctx, ngx_str_t *path)
{
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ctx->log, 0,
"http file cache delete: \"%s\"", path->data);
if (ngx_delete_file(path->data) == NGX_FILE_ERROR) {
ngx_log_error(NGX_LOG_CRIT, ctx->log, ngx_errno,
ngx_delete_file_n " \"%s\" failed", path->data);
}
return NGX_OK;
}
static void
ngx_http_file_cache_set_watermark(ngx_http_file_cache_t *cache)
{
cache->sh->watermark = cache->sh->count - cache->sh->count / 8;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, ngx_cycle->log, 0,
"http file cache watermark: %ui", cache->sh->watermark);
}
time_t
ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status)
{
ngx_uint_t i;
ngx_http_cache_valid_t *valid;
if (cache_valid == NULL) {
return 0;
}
valid = cache_valid->elts;
for (i = 0; i < cache_valid->nelts; i++) {
if (valid[i].status == 0) {
return valid[i].valid;
}
if (valid[i].status == status) {
return valid[i].valid;
}
}
return 0;
}
char *
ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
char *confp = conf;
off_t max_size;
u_char *last, *p;
time_t inactive;
ssize_t size;
ngx_str_t s, name, *value;
ngx_int_t loader_files, manager_files;
ngx_msec_t loader_sleep, manager_sleep, loader_threshold,
manager_threshold;
ngx_uint_t i, n, use_temp_path;
ngx_array_t *caches;
ngx_http_file_cache_t *cache, **ce;
cache = ngx_pcalloc(cf->pool, sizeof(ngx_http_file_cache_t));
if (cache == NULL) {
return NGX_CONF_ERROR;
}
cache->path = ngx_pcalloc(cf->pool, sizeof(ngx_path_t));
if (cache->path == NULL) {
return NGX_CONF_ERROR;
}
use_temp_path = 1;
inactive = 600;
loader_files = 100;
loader_sleep = 50;
loader_threshold = 200;
manager_files = 100;
manager_sleep = 50;
manager_threshold = 200;
name.len = 0;
size = 0;
max_size = NGX_MAX_OFF_T_VALUE;
value = cf->args->elts;
cache->path->name = value[1];
if (cache->path->name.data[cache->path->name.len - 1] == '/') {
cache->path->name.len--;
}
if (ngx_conf_full_name(cf->cycle, &cache->path->name, 0) != NGX_OK) {
return NGX_CONF_ERROR;
}
for (i = 2; i < cf->args->nelts; i++) {
if (ngx_strncmp(value[i].data, "levels=", 7) == 0) {
p = value[i].data + 7;
last = value[i].data + value[i].len;
for (n = 0; n < NGX_MAX_PATH_LEVEL && p < last; n++) {
if (*p > '0' && *p < '3') {
cache->path->level[n] = *p++ - '0';
cache->path->len += cache->path->level[n] + 1;
if (p == last) {
break;
}
if (*p++ == ':' && n < NGX_MAX_PATH_LEVEL - 1 && p < last) {
continue;
}
goto invalid_levels;
}
goto invalid_levels;
}
if (cache->path->len < 10 + NGX_MAX_PATH_LEVEL) {
continue;
}
invalid_levels:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid \"levels\" \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (ngx_strncmp(value[i].data, "use_temp_path=", 14) == 0) {
if (ngx_strcmp(&value[i].data[14], "on") == 0) {
use_temp_path = 1;
} else if (ngx_strcmp(&value[i].data[14], "off") == 0) {
use_temp_path = 0;
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid use_temp_path value \"%V\", "
"it must be \"on\" or \"off\"",
&value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "keys_zone=", 10) == 0) {
name.data = value[i].data + 10;
p = (u_char *) ngx_strchr(name.data, ':');
if (p) {
name.len = p - name.data;
p++;
s.len = value[i].data + value[i].len - p;
s.data = p;
size = ngx_parse_size(&s);
if (size > 8191) {
continue;
}
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid keys zone size \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (ngx_strncmp(value[i].data, "inactive=", 9) == 0) {
s.len = value[i].len - 9;
s.data = value[i].data + 9;
inactive = ngx_parse_time(&s, 1);
if (inactive == (time_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid inactive value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "max_size=", 9) == 0) {
s.len = value[i].len - 9;
s.data = value[i].data + 9;
max_size = ngx_parse_offset(&s);
if (max_size < 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid max_size value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "loader_files=", 13) == 0) {
loader_files = ngx_atoi(value[i].data + 13, value[i].len - 13);
if (loader_files == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid loader_files value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "loader_sleep=", 13) == 0) {
s.len = value[i].len - 13;
s.data = value[i].data + 13;
loader_sleep = ngx_parse_time(&s, 0);
if (loader_sleep == (ngx_msec_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid loader_sleep value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "loader_threshold=", 17) == 0) {
s.len = value[i].len - 17;
s.data = value[i].data + 17;
loader_threshold = ngx_parse_time(&s, 0);
if (loader_threshold == (ngx_msec_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid loader_threshold value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "manager_files=", 14) == 0) {
manager_files = ngx_atoi(value[i].data + 14, value[i].len - 14);
if (manager_files == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid manager_files value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "manager_sleep=", 14) == 0) {
s.len = value[i].len - 14;
s.data = value[i].data + 14;
manager_sleep = ngx_parse_time(&s, 0);
if (manager_sleep == (ngx_msec_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid manager_sleep value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
if (ngx_strncmp(value[i].data, "manager_threshold=", 18) == 0) {
s.len = value[i].len - 18;
s.data = value[i].data + 18;
manager_threshold = ngx_parse_time(&s, 0);
if (manager_threshold == (ngx_msec_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid manager_threshold value \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
continue;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid parameter \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
if (name.len == 0 || size == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"\"%V\" must have \"keys_zone\" parameter",
&cmd->name);
return NGX_CONF_ERROR;
}
cache->path->manager = ngx_http_file_cache_manager;
cache->path->loader = ngx_http_file_cache_loader;
cache->path->data = cache;
cache->path->conf_file = cf->conf_file->file.name.data;
cache->path->line = cf->conf_file->line;
cache->loader_files = loader_files;
cache->loader_sleep = loader_sleep;
cache->loader_threshold = loader_threshold;
cache->manager_files = manager_files;
cache->manager_sleep = manager_sleep;
cache->manager_threshold = manager_threshold;
if (ngx_add_path(cf, &cache->path) != NGX_OK) {
return NGX_CONF_ERROR;
}
cache->shm_zone = ngx_shared_memory_add(cf, &name, size, cmd->post);
if (cache->shm_zone == NULL) {
return NGX_CONF_ERROR;
}
if (cache->shm_zone->data) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"duplicate zone \"%V\"", &name);
return NGX_CONF_ERROR;
}
cache->shm_zone->init = ngx_http_file_cache_init;
cache->shm_zone->data = cache;
cache->use_temp_path = use_temp_path;
cache->inactive = inactive;
cache->max_size = max_size;
caches = (ngx_array_t *) (confp + cmd->offset);
ce = ngx_array_push(caches);
if (ce == NULL) {
return NGX_CONF_ERROR;
}
*ce = cache;
return NGX_CONF_OK;
}
char *
ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf)
{
char *p = conf;
time_t valid;
ngx_str_t *value;
ngx_uint_t i, n, status;
ngx_array_t **a;
ngx_http_cache_valid_t *v;
static ngx_uint_t statuses[] = { 200, 301, 302 };
a = (ngx_array_t **) (p + cmd->offset);
if (*a == NGX_CONF_UNSET_PTR) {
*a = ngx_array_create(cf->pool, 1, sizeof(ngx_http_cache_valid_t));
if (*a == NULL) {
return NGX_CONF_ERROR;
}
}
value = cf->args->elts;
n = cf->args->nelts - 1;
valid = ngx_parse_time(&value[n], 1);
if (valid == (time_t) NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid time value \"%V\"", &value[n]);
return NGX_CONF_ERROR;
}
if (n == 1) {
for (i = 0; i < 3; i++) {
v = ngx_array_push(*a);
if (v == NULL) {
return NGX_CONF_ERROR;
}
v->status = statuses[i];
v->valid = valid;
}
return NGX_CONF_OK;
}
for (i = 1; i < n; i++) {
if (ngx_strcmp(value[i].data, "any") == 0) {
status = 0;
} else {
status = ngx_atoi(value[i].data, value[i].len);
if (status < 100) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid status \"%V\"", &value[i]);
return NGX_CONF_ERROR;
}
}
v = ngx_array_push(*a);
if (v == NULL) {
return NGX_CONF_ERROR;
}
v->status = status;
v->valid = valid;
}
return NGX_CONF_OK;
}
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