Telodendria/src/Db.c

241 lines
4.3 KiB
C

/*
* Copyright (C) 2022 Jordan Bancino <@jordan:bancino.net>
*
* 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 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 <Db.h>
#include <Memory.h>
#include <Json.h>
#include <pthread.h>
struct Db
{
const char *dir;
size_t cacheSize;
size_t maxCache;
pthread_mutex_t lock;
HashMap *cache;
};
struct DbRef
{
HashMap *json;
pthread_mutex_t lock;
unsigned long ts;
char *file;
};
static ssize_t DbComputeSize(HashMap *);
static ssize_t
DbComputeSizeOfValue(JsonValue * val)
{
MemoryInfo *a;
ssize_t total = 0;
size_t i;
union
{
char *str;
Array *arr;
} u;
if (!val)
{
return -1;
}
a = MemoryInfoGet(val);
if (a)
{
total += MemoryInfoGetSize(a);
}
switch (JsonValueType(val))
{
case JSON_OBJECT:
total += DbComputeSize(JsonValueAsObject(val));
break;
case JSON_ARRAY:
u.arr = JsonValueAsArray(val);
a = MemoryInfoGet(u.arr);
if (a)
{
total += MemoryInfoGetSize(a);
}
for (i = 0; i < ArraySize(u.arr); i++)
{
total += DbComputeSizeOfValue(ArrayGet(u.arr, i));
}
break;
case JSON_STRING:
u.str = JsonValueAsString(val);
a = MemoryInfoGet(u.str);
if (a)
{
total += MemoryInfoGetSize(a);
}
break;
case JSON_NULL:
case JSON_INTEGER:
case JSON_FLOAT:
case JSON_BOOLEAN:
default:
/* These don't use any extra heap space */
break;
}
return total;
}
static ssize_t
DbComputeSize(HashMap * json)
{
char *key;
JsonValue *val;
MemoryInfo *a;
size_t total;
if (!json)
{
return -1;
}
total = 0;
a = MemoryInfoGet(json);
if (a)
{
total += MemoryInfoGetSize(a);
}
while (HashMapIterate(json, &key, (void **) &val))
{
a = MemoryInfoGet(key);
if (a)
{
total += MemoryInfoGetSize(a);
}
total += DbComputeSizeOfValue(val);
}
return total;
}
Db *
DbOpen(const char *dir, size_t cache)
{
Db *db;
if (!dir)
{
return NULL;
}
db = Malloc(sizeof(Db));
if (!db)
{
return NULL;
}
db->dir = dir;
db->maxCache = cache;
pthread_mutex_init(&db->lock, NULL);
if (db->maxCache)
{
db->cache = HashMapCreate();
if (!db->cache)
{
return NULL;
}
}
return db;
}
void
DbClose(Db * db)
{
if (!db)
{
return;
}
pthread_mutex_destroy(&db->lock);
HashMapFree(db->cache);
Free(db);
}
DbRef *
DbCreate(Db * db, char *prefix, char *key)
{
if (!db || !prefix || !key)
{
return NULL;
}
return NULL;
}
DbRef *
DbLock(Db * db, char *prefix, char *key)
{
if (!db || !prefix || !key)
{
return NULL;
}
pthread_mutex_lock(&db->lock);
pthread_mutex_unlock(&db->lock);
return NULL;
}
void
DbUnlock(Db * db, DbRef * ref)
{
if (!db || !ref)
{
return;
}
pthread_mutex_lock(&db->lock);
pthread_mutex_unlock(&db->lock);
return;
}
HashMap *
DbJson(DbRef * ref)
{
return ref ? ref->json : NULL;
}