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/*
* Copyright (c) 2015 DeNA Co., Ltd., Kazuho Oku
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <unistd.h>
#include "khash.h"
#include "h2o/memory.h"
#include "h2o/filecache.h"
KHASH_SET_INIT_STR(opencache_set)
struct st_h2o_filecache_t {
khash_t(opencache_set) * hash;
h2o_linklist_t lru;
size_t capacity;
};
static inline void release_from_cache(h2o_filecache_t *cache, khiter_t iter)
{
const char *path = kh_key(cache->hash, iter);
h2o_filecache_ref_t *ref = H2O_STRUCT_FROM_MEMBER(h2o_filecache_ref_t, _path, path);
/* detach from list */
kh_del(opencache_set, cache->hash, iter);
h2o_linklist_unlink(&ref->_lru);
/* and close */
h2o_filecache_close_file(ref);
}
h2o_filecache_t *h2o_filecache_create(size_t capacity)
{
h2o_filecache_t *cache = h2o_mem_alloc(sizeof(*cache));
cache->hash = kh_init(opencache_set);
h2o_linklist_init_anchor(&cache->lru);
cache->capacity = capacity;
return cache;
}
void h2o_filecache_destroy(h2o_filecache_t *cache)
{
h2o_filecache_clear(cache);
assert(kh_size(cache->hash) == 0);
assert(h2o_linklist_is_empty(&cache->lru));
kh_destroy(opencache_set, cache->hash);
free(cache);
}
void h2o_filecache_clear(h2o_filecache_t *cache)
{
khiter_t iter;
for (iter = kh_begin(cache->hash); iter != kh_end(cache->hash); ++iter) {
if (!kh_exist(cache->hash, iter))
continue;
release_from_cache(cache, iter);
}
assert(kh_size(cache->hash) == 0);
}
h2o_filecache_ref_t *h2o_filecache_open_file(h2o_filecache_t *cache, const char *path, int oflag)
{
khiter_t iter = kh_get(opencache_set, cache->hash, path);
h2o_filecache_ref_t *ref;
int dummy;
/* lookup cache, and return the one if found */
if (iter != kh_end(cache->hash)) {
ref = H2O_STRUCT_FROM_MEMBER(h2o_filecache_ref_t, _path, kh_key(cache->hash, iter));
++ref->_refcnt;
goto Exit;
}
/* create a new cache entry */
ref = h2o_mem_alloc(offsetof(h2o_filecache_ref_t, _path) + strlen(path) + 1);
ref->_refcnt = 1;
ref->_lru = (h2o_linklist_t){NULL};
strcpy(ref->_path, path);
/* if cache is used, then... */
if (cache->capacity != 0) {
/* purge one entry from LRU if cache is full */
if (kh_size(cache->hash) == cache->capacity) {
h2o_filecache_ref_t *purge_ref = H2O_STRUCT_FROM_MEMBER(h2o_filecache_ref_t, _lru, cache->lru.prev);
khiter_t purge_iter = kh_get(opencache_set, cache->hash, purge_ref->_path);
assert(purge_iter != kh_end(cache->hash));
release_from_cache(cache, purge_iter);
}
/* assign the new entry */
++ref->_refcnt;
kh_put(opencache_set, cache->hash, ref->_path, &dummy);
h2o_linklist_insert(cache->lru.next, &ref->_lru);
}
/* open the file, or memoize the error */
if ((ref->fd = open(path, oflag)) != -1 && fstat(ref->fd, &ref->st) == 0) {
ref->_last_modified.str[0] = '\0';
ref->_etag.len = 0;
} else {
ref->open_err = errno;
if (ref->fd != -1) {
close(ref->fd);
ref->fd = -1;
}
}
Exit:
/* if the cache entry retains an error, return it instead of the reference */
if (ref->fd == -1) {
errno = ref->open_err;
h2o_filecache_close_file(ref);
ref = NULL;
}
return ref;
}
void h2o_filecache_close_file(h2o_filecache_ref_t *ref)
{
if (--ref->_refcnt != 0)
return;
assert(!h2o_linklist_is_linked(&ref->_lru));
if (ref->fd != -1) {
close(ref->fd);
ref->fd = -1;
}
free(ref);
}
struct tm *h2o_filecache_get_last_modified(h2o_filecache_ref_t *ref, char *outbuf)
{
assert(ref->fd != -1);
if (ref->_last_modified.str[0] == '\0') {
gmtime_r(&ref->st.st_mtime, &ref->_last_modified.gm);
h2o_time2str_rfc1123(ref->_last_modified.str, &ref->_last_modified.gm);
}
if (outbuf != NULL)
memcpy(outbuf, ref->_last_modified.str, H2O_TIMESTR_RFC1123_LEN + 1);
return &ref->_last_modified.gm;
}
size_t h2o_filecache_get_etag(h2o_filecache_ref_t *ref, char *outbuf)
{
assert(ref->fd != -1);
if (ref->_etag.len == 0)
ref->_etag.len = sprintf(ref->_etag.buf, "\"%08x-%zx\"", (unsigned)ref->st.st_mtime, (size_t)ref->st.st_size);
memcpy(outbuf, ref->_etag.buf, ref->_etag.len + 1);
return ref->_etag.len;
}
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