2022-10-24 16:44:29 +00:00
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/*
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* Copyright (C) 2022 Jordan Bancino <@jordan:bancino.net>
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <Db.h>
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#include <Memory.h>
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2022-11-06 00:47:17 +00:00
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#include <Json.h>
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2022-11-15 18:20:05 +00:00
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#include <Util.h>
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2022-10-24 16:44:29 +00:00
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#include <pthread.h>
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2022-11-21 16:13:11 +00:00
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#include <fcntl.h>
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2022-11-22 22:31:36 +00:00
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#include <unistd.h>
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2022-10-24 16:44:29 +00:00
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struct Db
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{
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2022-11-15 18:20:05 +00:00
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char *dir;
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2022-10-24 16:44:29 +00:00
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pthread_mutex_t lock;
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2022-10-31 12:12:42 +00:00
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2022-11-18 20:42:08 +00:00
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size_t cacheSize;
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size_t maxCache;
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2022-10-31 12:12:42 +00:00
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HashMap *cache;
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2022-11-18 20:42:08 +00:00
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DbRef *mostRecent;
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DbRef *leastRecent;
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2022-10-24 16:44:29 +00:00
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};
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struct DbRef
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{
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2022-10-31 12:12:42 +00:00
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HashMap *json;
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2022-10-24 16:44:29 +00:00
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pthread_mutex_t lock;
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2022-10-31 12:12:42 +00:00
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unsigned long ts;
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2022-11-15 18:20:05 +00:00
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size_t size;
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2022-11-21 20:31:37 +00:00
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Array *name;
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2022-11-18 20:42:08 +00:00
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DbRef *prev;
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DbRef *next;
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2022-11-21 16:13:11 +00:00
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FILE *fp;
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2022-10-24 16:44:29 +00:00
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};
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2022-11-12 18:26:31 +00:00
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static ssize_t DbComputeSize(HashMap *);
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static ssize_t
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DbComputeSizeOfValue(JsonValue * val)
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{
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MemoryInfo *a;
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ssize_t total = 0;
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size_t i;
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union
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{
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char *str;
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Array *arr;
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} u;
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if (!val)
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{
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return -1;
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}
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a = MemoryInfoGet(val);
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if (a)
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{
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total += MemoryInfoGetSize(a);
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}
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switch (JsonValueType(val))
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{
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case JSON_OBJECT:
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total += DbComputeSize(JsonValueAsObject(val));
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break;
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case JSON_ARRAY:
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u.arr = JsonValueAsArray(val);
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a = MemoryInfoGet(u.arr);
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if (a)
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{
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total += MemoryInfoGetSize(a);
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}
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for (i = 0; i < ArraySize(u.arr); i++)
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{
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total += DbComputeSizeOfValue(ArrayGet(u.arr, i));
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}
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break;
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case JSON_STRING:
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u.str = JsonValueAsString(val);
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a = MemoryInfoGet(u.str);
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if (a)
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{
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total += MemoryInfoGetSize(a);
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}
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break;
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case JSON_NULL:
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case JSON_INTEGER:
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case JSON_FLOAT:
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case JSON_BOOLEAN:
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default:
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/* These don't use any extra heap space */
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break;
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}
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return total;
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}
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2022-11-06 00:47:17 +00:00
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static ssize_t
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2022-11-08 01:05:28 +00:00
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DbComputeSize(HashMap * json)
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2022-11-06 00:47:17 +00:00
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{
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2022-11-08 01:05:28 +00:00
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char *key;
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JsonValue *val;
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MemoryInfo *a;
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size_t total;
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if (!json)
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{
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return -1;
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}
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total = 0;
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a = MemoryInfoGet(json);
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if (a)
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{
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total += MemoryInfoGetSize(a);
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}
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while (HashMapIterate(json, &key, (void **) &val))
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{
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a = MemoryInfoGet(key);
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if (a)
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{
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total += MemoryInfoGetSize(a);
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}
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2022-11-12 18:26:31 +00:00
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total += DbComputeSizeOfValue(val);
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2022-11-08 01:05:28 +00:00
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}
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return total;
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2022-11-06 00:47:17 +00:00
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}
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2022-11-15 18:20:05 +00:00
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static char *
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2022-11-21 20:31:37 +00:00
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DbHashKey(Array * args)
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2022-11-15 18:20:05 +00:00
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{
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2022-11-21 20:31:37 +00:00
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size_t i;
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char *str = NULL;
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for (i = 0; i < ArraySize(args); i++)
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{
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char *tmp = UtilStringConcat(str, ArrayGet(args, i));
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Free(str);
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str = tmp;
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}
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return str;
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2022-11-15 18:20:05 +00:00
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}
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static char *
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2022-11-21 20:31:37 +00:00
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DbDirName(Db * db, Array * args)
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2022-11-15 18:20:05 +00:00
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{
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2022-11-21 20:31:37 +00:00
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size_t i;
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char *str = UtilStringConcat(db->dir, "/");
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for (i = 0; i < ArraySize(args) - 1; i++)
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{
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char *tmp, *tmp2;
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2022-11-15 18:20:05 +00:00
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2022-11-21 20:31:37 +00:00
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tmp = UtilStringConcat(str, ArrayGet(args, i));
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tmp2 = UtilStringConcat(tmp, "/");
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2022-11-15 18:20:05 +00:00
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2022-11-21 20:31:37 +00:00
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Free(str);
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Free(tmp);
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2022-11-15 18:20:05 +00:00
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2022-11-21 20:31:37 +00:00
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str = tmp2;
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}
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return str;
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}
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static char *
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DbFileName(Db * db, Array * args)
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{
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size_t i;
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char *str = UtilStringConcat(db->dir, "/");
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for (i = 0; i < ArraySize(args); i++)
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{
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char *tmp, *tmp2;
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2022-12-15 16:07:45 +00:00
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char *arg = UtilStringDuplicate(ArrayGet(args, i));
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2022-11-21 20:31:37 +00:00
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2022-12-15 16:07:45 +00:00
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/* Sanitize name to prevent directory traversal attacks */
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while (*arg)
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{
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switch (*arg)
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{
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case '/':
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*arg = '_';
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break;
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case '.':
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*arg = '-';
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break;
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default:
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break;
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}
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arg++;
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}
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tmp = UtilStringConcat(str, arg);
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tmp2 = UtilStringConcat(tmp,
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(i < ArraySize(args) - 1) ? "/" : ".json");
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2022-11-21 20:31:37 +00:00
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2022-12-15 16:07:45 +00:00
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Free(arg);
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2022-11-21 20:31:37 +00:00
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Free(str);
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Free(tmp);
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str = tmp2;
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}
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return str;
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2022-11-15 18:20:05 +00:00
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}
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2022-11-18 20:42:08 +00:00
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static void
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DbCacheEvict(Db * db)
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{
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DbRef *ref = db->leastRecent;
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2022-11-18 22:17:56 +00:00
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DbRef *tmp;
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2022-11-18 20:42:08 +00:00
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while (ref && db->cacheSize > db->maxCache)
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{
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2022-11-21 20:31:37 +00:00
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char *hash = DbHashKey(ref->name);
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2022-11-18 20:42:08 +00:00
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2022-11-18 22:17:56 +00:00
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if (pthread_mutex_trylock(&ref->lock) != 0)
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{
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/* This ref is locked by another thread, don't evict it. */
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ref = ref->next;
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continue;
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}
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2022-11-18 20:42:08 +00:00
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JsonFree(ref->json);
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2022-11-18 22:17:56 +00:00
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pthread_mutex_unlock(&ref->lock);
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2022-11-18 20:42:08 +00:00
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pthread_mutex_destroy(&ref->lock);
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2022-11-21 20:31:37 +00:00
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hash = DbHashKey(ref->name);
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2022-11-18 20:42:08 +00:00
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HashMapDelete(db->cache, hash);
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Free(hash);
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2022-11-18 22:17:56 +00:00
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2022-11-21 20:31:37 +00:00
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ArrayFree(ref->name);
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2022-11-18 20:42:08 +00:00
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db->cacheSize -= ref->size;
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2022-11-18 22:17:56 +00:00
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ref->next->prev = ref->prev;
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if (!ref->prev)
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{
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db->leastRecent = ref->next;
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}
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else
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{
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ref->prev->next = ref->next;
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}
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tmp = ref->next;
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2022-11-18 20:42:08 +00:00
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Free(ref);
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2022-11-18 22:17:56 +00:00
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ref = tmp;
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2022-11-18 20:42:08 +00:00
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}
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}
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2022-10-24 16:44:29 +00:00
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Db *
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2022-11-15 18:20:05 +00:00
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DbOpen(char *dir, size_t cache)
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2022-10-24 16:44:29 +00:00
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{
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Db *db;
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2022-11-21 16:22:50 +00:00
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if (!dir || cache < DB_MIN_CACHE)
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2022-10-24 16:44:29 +00:00
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{
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return NULL;
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}
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db = Malloc(sizeof(Db));
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if (!db)
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{
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return NULL;
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}
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db->dir = dir;
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2022-10-31 12:12:42 +00:00
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db->maxCache = cache;
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2022-10-24 16:44:29 +00:00
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pthread_mutex_init(&db->lock, NULL);
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2022-11-18 22:17:56 +00:00
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db->cache = HashMapCreate();
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if (!db->cache)
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2022-11-15 18:20:05 +00:00
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{
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2022-11-18 22:17:56 +00:00
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return NULL;
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2022-11-15 18:20:05 +00:00
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}
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2022-10-24 16:44:29 +00:00
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2022-11-18 20:42:08 +00:00
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db->mostRecent = NULL;
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db->leastRecent = NULL;
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2022-10-24 16:44:29 +00:00
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return db;
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}
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void
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DbClose(Db * db)
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{
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2022-11-15 18:20:05 +00:00
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char *key;
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DbRef *val;
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2022-10-24 16:44:29 +00:00
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if (!db)
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{
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return;
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}
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2022-10-31 12:12:42 +00:00
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pthread_mutex_destroy(&db->lock);
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2022-11-15 18:20:05 +00:00
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2022-11-21 16:13:11 +00:00
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while (HashMapIterate(db->cache, &key, (void **) &val))
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2022-11-15 18:20:05 +00:00
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{
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2022-11-21 16:13:11 +00:00
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Free(key);
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JsonFree(val->json);
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2022-11-21 20:31:37 +00:00
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ArrayFree(val->name);
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2022-11-21 16:13:11 +00:00
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pthread_mutex_destroy(&val->lock);
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Free(val);
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2022-11-15 18:20:05 +00:00
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}
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2022-11-21 16:13:11 +00:00
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HashMapFree(db->cache);
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2022-10-31 12:12:42 +00:00
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2022-10-24 16:44:29 +00:00
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Free(db);
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}
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2022-11-21 20:31:37 +00:00
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static DbRef *
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DbLockFromArr(Db * db, Array * args)
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2022-10-24 16:44:29 +00:00
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{
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2022-11-15 18:20:05 +00:00
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char *file;
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char *hash;
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DbRef *ref;
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2022-11-21 16:13:11 +00:00
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|
FILE *fp;
|
|
|
|
struct flock lock;
|
2022-11-15 18:20:05 +00:00
|
|
|
|
2022-11-21 20:31:37 +00:00
|
|
|
if (!db || !args)
|
2022-10-31 12:12:42 +00:00
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
ref = NULL;
|
|
|
|
hash = NULL;
|
|
|
|
|
2022-10-31 12:12:42 +00:00
|
|
|
pthread_mutex_lock(&db->lock);
|
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
/* Check if the item is in the cache */
|
2022-11-21 20:31:37 +00:00
|
|
|
hash = DbHashKey(args);
|
2022-11-18 22:17:56 +00:00
|
|
|
ref = HashMapGet(db->cache, hash);
|
2022-11-21 20:31:37 +00:00
|
|
|
file = DbFileName(db, args);
|
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
/* Open the file for reading and writing so we can lock it */
|
|
|
|
fp = fopen(file, "r+");
|
|
|
|
if (!fp)
|
|
|
|
{
|
|
|
|
ref = NULL;
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
|
|
|
lock.l_start = 0;
|
|
|
|
lock.l_len = 0;
|
|
|
|
lock.l_type = F_WRLCK;
|
|
|
|
lock.l_whence = SEEK_SET;
|
|
|
|
|
|
|
|
/* Lock the file on the disk */
|
|
|
|
if (fcntl(fileno(fp), F_SETLK, &lock) < 0)
|
|
|
|
{
|
|
|
|
fclose(fp);
|
|
|
|
ref = NULL;
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
if (ref) /* In cache */
|
|
|
|
{
|
|
|
|
unsigned long diskTs = UtilLastModified(file);
|
|
|
|
|
2022-11-18 22:17:56 +00:00
|
|
|
pthread_mutex_lock(&ref->lock);
|
2022-11-21 16:13:11 +00:00
|
|
|
ref->fp = fp;
|
2022-11-18 22:17:56 +00:00
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
if (diskTs > ref->ts)
|
|
|
|
{
|
|
|
|
/* File was modified on disk since it was cached */
|
2022-11-21 16:13:11 +00:00
|
|
|
HashMap *json = JsonDecode(fp);
|
2022-11-15 18:20:05 +00:00
|
|
|
|
|
|
|
if (!json)
|
|
|
|
{
|
2022-11-18 22:17:56 +00:00
|
|
|
pthread_mutex_unlock(&ref->lock);
|
2022-11-21 16:13:11 +00:00
|
|
|
fclose(fp);
|
2022-11-15 18:20:05 +00:00
|
|
|
ref = NULL;
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
|
|
|
JsonFree(ref->json);
|
|
|
|
ref->json = json;
|
|
|
|
ref->ts = diskTs;
|
|
|
|
ref->size = DbComputeSize(ref->json);
|
2022-11-18 20:42:08 +00:00
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
}
|
2022-11-18 20:42:08 +00:00
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
/* Float this ref to mostRecent */
|
|
|
|
if (ref->next)
|
|
|
|
{
|
|
|
|
ref->next->prev = ref->prev;
|
2022-11-18 20:42:08 +00:00
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
if (!ref->prev)
|
|
|
|
{
|
|
|
|
db->leastRecent = ref->next;
|
2022-11-18 20:42:08 +00:00
|
|
|
}
|
2022-11-23 14:56:31 +00:00
|
|
|
else
|
|
|
|
{
|
|
|
|
ref->prev->next = ref->next;
|
|
|
|
}
|
2022-11-18 22:17:56 +00:00
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
ref->prev = db->mostRecent;
|
|
|
|
ref->next = NULL;
|
|
|
|
db->mostRecent = ref;
|
2022-11-15 18:20:05 +00:00
|
|
|
}
|
2022-11-21 16:13:11 +00:00
|
|
|
|
|
|
|
/* The file on disk may be larger than what we have in memory,
|
|
|
|
* which may require items in cache to be evicted. */
|
|
|
|
DbCacheEvict(db);
|
2022-11-15 18:20:05 +00:00
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
2022-11-23 14:56:31 +00:00
|
|
|
Array *name = ArrayCreate();
|
|
|
|
size_t i;
|
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
/* Not in cache; load from disk */
|
|
|
|
|
|
|
|
ref = Malloc(sizeof(DbRef));
|
|
|
|
if (!ref)
|
|
|
|
{
|
|
|
|
fclose(fp);
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
|
|
|
ref->json = JsonDecode(fp);
|
2022-11-21 16:13:11 +00:00
|
|
|
ref->fp = fp;
|
2022-11-15 18:20:05 +00:00
|
|
|
|
|
|
|
if (!ref->json)
|
|
|
|
{
|
|
|
|
Free(ref);
|
2022-11-21 16:13:11 +00:00
|
|
|
fclose(fp);
|
2022-11-15 18:20:05 +00:00
|
|
|
ref = NULL;
|
|
|
|
goto finish;
|
|
|
|
}
|
|
|
|
|
|
|
|
pthread_mutex_init(&ref->lock, NULL);
|
2022-11-18 22:17:56 +00:00
|
|
|
pthread_mutex_lock(&ref->lock);
|
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
ref->ts = UtilServerTs();
|
|
|
|
ref->size = DbComputeSize(ref->json);
|
2022-11-23 14:56:31 +00:00
|
|
|
|
|
|
|
for (i = 0; i < ArraySize(args); i++)
|
|
|
|
{
|
|
|
|
ArrayAdd(name, UtilStringDuplicate(ArrayGet(args, i)));
|
|
|
|
}
|
|
|
|
ref->name = name;
|
2022-11-15 18:20:05 +00:00
|
|
|
|
2022-11-18 22:17:56 +00:00
|
|
|
HashMapSet(db->cache, hash, ref);
|
|
|
|
db->cacheSize += ref->size;
|
2022-11-15 18:20:05 +00:00
|
|
|
|
2022-11-18 22:17:56 +00:00
|
|
|
ref->next = NULL;
|
|
|
|
ref->prev = db->mostRecent;
|
|
|
|
db->mostRecent = ref;
|
2022-11-18 20:42:08 +00:00
|
|
|
|
2022-11-18 22:17:56 +00:00
|
|
|
/* Adding this item to the cache may case it to grow too large,
|
|
|
|
* requiring some items to be evicted */
|
|
|
|
DbCacheEvict(db);
|
2022-11-15 18:20:05 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
finish:
|
2022-11-17 23:51:45 +00:00
|
|
|
pthread_mutex_unlock(&db->lock);
|
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
Free(file);
|
|
|
|
Free(hash);
|
2022-11-18 19:36:15 +00:00
|
|
|
|
2022-11-15 18:20:05 +00:00
|
|
|
return ref;
|
2022-10-24 16:44:29 +00:00
|
|
|
}
|
|
|
|
|
2022-11-21 20:31:37 +00:00
|
|
|
DbRef *
|
|
|
|
DbCreate(Db * db, size_t nArgs,...)
|
|
|
|
{
|
|
|
|
FILE *fp;
|
|
|
|
char *file;
|
|
|
|
char *dir;
|
|
|
|
va_list ap;
|
|
|
|
Array *args;
|
|
|
|
|
|
|
|
if (!db)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
va_start(ap, nArgs);
|
|
|
|
args = ArrayFromVarArgs(nArgs, ap);
|
|
|
|
va_end(ap);
|
|
|
|
|
|
|
|
if (!args)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
file = DbFileName(db, args);
|
|
|
|
|
2022-11-21 20:59:22 +00:00
|
|
|
if (UtilLastModified(file))
|
2022-11-21 20:31:37 +00:00
|
|
|
{
|
|
|
|
Free(file);
|
|
|
|
ArrayFree(args);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
dir = DbDirName(db, args);
|
|
|
|
if (UtilMkdir(dir, 0750) < 0)
|
|
|
|
{
|
|
|
|
Free(file);
|
|
|
|
ArrayFree(args);
|
|
|
|
Free(dir);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
2022-11-23 14:56:31 +00:00
|
|
|
Free(dir);
|
2022-11-21 20:59:22 +00:00
|
|
|
|
2022-11-21 20:31:37 +00:00
|
|
|
fp = fopen(file, "w");
|
|
|
|
Free(file);
|
|
|
|
if (!fp)
|
|
|
|
{
|
|
|
|
ArrayFree(args);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
fprintf(fp, "{}");
|
|
|
|
fflush(fp);
|
|
|
|
fclose(fp);
|
|
|
|
|
|
|
|
return DbLockFromArr(db, args);
|
|
|
|
}
|
|
|
|
|
2022-12-15 02:39:58 +00:00
|
|
|
int
|
|
|
|
DbDelete(Db * db, size_t nArgs,...)
|
|
|
|
{
|
|
|
|
va_list ap;
|
|
|
|
Array *args;
|
|
|
|
char *file;
|
|
|
|
char *hash;
|
|
|
|
int ret = 1;
|
|
|
|
DbRef *ref;
|
|
|
|
|
|
|
|
if (!db)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
va_start(ap, nArgs);
|
|
|
|
args = ArrayFromVarArgs(nArgs, ap);
|
|
|
|
va_end(ap);
|
|
|
|
|
|
|
|
pthread_mutex_lock(&db->lock);
|
|
|
|
|
|
|
|
hash = DbHashKey(args);
|
|
|
|
file = DbFileName(db, args);
|
|
|
|
|
|
|
|
ref = HashMapGet(db->cache, hash);
|
|
|
|
if (ref)
|
|
|
|
{
|
|
|
|
pthread_mutex_lock(&ref->lock);
|
|
|
|
|
|
|
|
HashMapDelete(db->cache, hash);
|
|
|
|
JsonFree(ref->json);
|
|
|
|
ArrayFree(ref->name);
|
|
|
|
|
|
|
|
db->cacheSize -= ref->size;
|
|
|
|
|
|
|
|
if (ref->next)
|
|
|
|
{
|
|
|
|
ref->next->prev = ref->prev;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
db->mostRecent = ref->prev;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ref->prev)
|
|
|
|
{
|
|
|
|
ref->prev->next = ref->next;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
db->leastRecent = ref->next;
|
|
|
|
}
|
|
|
|
|
|
|
|
pthread_mutex_unlock(&ref->lock);
|
|
|
|
pthread_mutex_destroy(&ref->lock);
|
|
|
|
Free(ref);
|
|
|
|
}
|
|
|
|
|
|
|
|
Free(hash);
|
|
|
|
|
|
|
|
if (UtilLastModified(file))
|
|
|
|
{
|
|
|
|
ret = remove(file) == 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
pthread_mutex_unlock(&db->lock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2022-11-21 20:31:37 +00:00
|
|
|
DbRef *
|
|
|
|
DbLock(Db * db, size_t nArgs,...)
|
|
|
|
{
|
|
|
|
va_list ap;
|
|
|
|
Array *args;
|
|
|
|
DbRef *ret;
|
|
|
|
|
|
|
|
va_start(ap, nArgs);
|
|
|
|
args = ArrayFromVarArgs(nArgs, ap);
|
|
|
|
va_end(ap);
|
|
|
|
|
|
|
|
if (!args)
|
|
|
|
{
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = DbLockFromArr(db, args);
|
|
|
|
|
|
|
|
ArrayFree(args);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2022-11-17 22:57:29 +00:00
|
|
|
int
|
2022-10-24 16:44:29 +00:00
|
|
|
DbUnlock(Db * db, DbRef * ref)
|
|
|
|
{
|
2022-10-31 12:12:42 +00:00
|
|
|
if (!db || !ref)
|
|
|
|
{
|
2022-11-17 22:57:29 +00:00
|
|
|
return 0;
|
2022-10-31 12:12:42 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
pthread_mutex_lock(&db->lock);
|
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
rewind(ref->fp);
|
2022-11-23 00:44:29 +00:00
|
|
|
if (ftruncate(fileno(ref->fp), 0) < 0)
|
2022-11-23 14:56:31 +00:00
|
|
|
{
|
|
|
|
pthread_mutex_unlock(&db->lock);
|
|
|
|
return 0;
|
|
|
|
}
|
2022-10-31 12:12:42 +00:00
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
JsonEncode(ref->json, ref->fp);
|
2022-11-15 18:20:05 +00:00
|
|
|
|
2022-11-21 16:13:11 +00:00
|
|
|
fflush(ref->fp);
|
|
|
|
fclose(ref->fp);
|
2022-11-15 18:20:05 +00:00
|
|
|
|
2022-11-18 22:17:56 +00:00
|
|
|
db->cacheSize -= ref->size;
|
|
|
|
ref->size = DbComputeSize(ref->json);
|
|
|
|
db->cacheSize += ref->size;
|
2022-11-18 20:42:08 +00:00
|
|
|
|
2022-11-18 22:17:56 +00:00
|
|
|
pthread_mutex_unlock(&ref->lock);
|
|
|
|
|
|
|
|
/* If this ref has grown significantly since we last computed its
|
|
|
|
* size, it may have filled the cache and require some items to be
|
|
|
|
* evicted. */
|
|
|
|
DbCacheEvict(db);
|
2022-11-17 22:57:29 +00:00
|
|
|
|
2022-11-18 19:36:15 +00:00
|
|
|
pthread_mutex_unlock(&db->lock);
|
2022-11-17 22:57:29 +00:00
|
|
|
return 1;
|
2022-10-24 16:44:29 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
HashMap *
|
|
|
|
DbJson(DbRef * ref)
|
|
|
|
{
|
2022-10-31 12:12:42 +00:00
|
|
|
return ref ? ref->json : NULL;
|
2022-10-24 16:44:29 +00:00
|
|
|
}
|