[MOD/WIP] Separate all DB operations

Somewhat untested, but I fail to see how it could fail, right?

Next up: Getting the basics of LMDB up and running.

src/Db/Db.c

@@ -292,15 +292,9 @@ DbCreate(Db * db, size_t nArgs,...)
 bool
 DbDelete(Db * db, size_t nArgs,...)
 {
-    (void) nArgs;
-    (void) db;
-    /* TODO */
-    /*va_list ap;
+    va_list ap;
     Array *args;
-    char *file;
-    char *hash;
     bool ret = true;
-    DbRef *ref;
 
     if (!db)
     {
@@ -311,59 +305,10 @@ DbDelete(Db * db, size_t 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)
-    {
-        HashMapDelete(db->cache, hash);
-        JsonFree(ref->json);
-        StringArrayFree(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;
-        }
-
-        if (!db->leastRecent)
-        {
-            db->leastRecent = db->mostRecent;
-        }
-
-        Free(ref);
-    }
-
-    Free(hash);
-
-    if (UtilLastModified(file))
-    {
-        ret = (remove(file) == 0);
-    }
-
-    pthread_mutex_unlock(&db->lock);
+    ret = db->delete(db, args);
 
     ArrayFree(args);
-    Free(file);
-    return ret;*/
-    return false;
+    return ret;
 }
 
 DbRef *
@@ -403,13 +348,13 @@ DbUnlock(Db * db, DbRef * ref)
 bool
 DbExists(Db * db, size_t nArgs,...)
 {
-    (void) nArgs;
-    (void) db;
-    return false;
-    /*va_list ap;
+    va_list ap;
     Array *args;
-    char *file;
     bool ret;
+    if (!db || !nArgs || !db->exists)
+    {
+        return false;
+    }
 
     va_start(ap, nArgs);
     args = ArrayFromVarArgs(nArgs, ap);
@@ -420,81 +365,32 @@ DbExists(Db * db, size_t nArgs,...)
         return false;
     }
 
-    pthread_mutex_lock(&db->lock);
-
-    file = DbFileName(db, args);
-    ret = (UtilLastModified(file) != 0);
-
-    pthread_mutex_unlock(&db->lock);
-
-    Free(file);
+    ret = db->exists(db, args);
     ArrayFree(args);
 
-    return ret;*/
+    return ret;
 }
 
 Array *
 DbList(Db * db, size_t nArgs,...)
 {
-    (void) db;
-    (void) nArgs;
-    /* TODO */
-    /*Array *result;
+    Array *result;
     Array *path;
-    DIR *files;
-    struct dirent *file;
-    char *dir;
     va_list ap;
 
-    if (!db || !nArgs)
-    {
-        return NULL;
-    }
-
-    result = ArrayCreate();
-    if (!result)
+    if (!db || !nArgs || !db->list)
     {
         return NULL;
     }
 
     va_start(ap, nArgs);
     path = ArrayFromVarArgs(nArgs, ap);
-    dir = DbDirName(db, path, 0);
-
-    pthread_mutex_lock(&db->lock);
-
-    files = opendir(dir);
-    if (!files)
-    {
-        ArrayFree(path);
-        ArrayFree(result);
-        Free(dir);
-        pthread_mutex_unlock(&db->lock);
-        return NULL;
-    }
-    while ((file = readdir(files)))
-    {
-        size_t namlen = strlen(file->d_name);
-
-        if (namlen > 5)
-        {
-            int nameOffset = namlen - 5;
-
-            if (StrEquals(file->d_name + nameOffset, ".json"))
-            {
-                file->d_name[nameOffset] = '\0';
-                ArrayAdd(result, StrDuplicate(file->d_name));
-            }
-        }
-    }
-    closedir(files);
+    va_end(ap);
 
+    result = db->list(db, path);
+    
     ArrayFree(path);
-    Free(dir);
-    pthread_mutex_unlock(&db->lock);
-
-    return result;*/
-    return NULL;
+    return result;
 }
 
 void
@@ -574,3 +470,12 @@ DbRefInit(Db *db, DbRef *ref)
     }
     db->mostRecent = ref;
 }
+void
+StringArrayAppend(Array *arr, char *str)
+{
+    if (!arr || !str)
+    {
+        return;
+    }
+    ArrayAdd(arr, StrDuplicate(str));
+}

src/Db/Flat.c

@@ -252,6 +252,100 @@ FlatCreate(Db *d, Array *dir)
     return ret;
 }
 
+static bool
+FlatDelete(Db *d, Array *dir)
+{
+    bool ret = true;
+    char *file;
+    FlatDb *db = (FlatDb *) d;
+    if (!d || !dir)
+    {
+        return false;
+    }
+
+    pthread_mutex_lock(&d->lock);
+    file = DbFileName(db, dir);
+
+    /* TODO: Unlink the entry from the linkedlist */
+    if (UtilLastModified(file))
+    {
+        ret = remove(file) == 0;
+    }
+
+    Free(file);
+    pthread_mutex_lock(&d->lock);
+    return ret;
+}
+
+static Array *
+FlatList(Db *d, Array *dir)
+{
+    FlatDb *db = (FlatDb *) d;
+    struct dirent *file;
+    Array *ret;
+    DIR *files;
+    char *path;
+
+    if (!d || !dir)
+    {
+        return NULL;
+    }
+
+    pthread_mutex_lock(&d->lock);
+
+    path = DbDirName(db, dir, 0);
+    files = opendir(path);
+    if (!files)
+    {
+        Free(path);
+        pthread_mutex_unlock(&d->lock);
+        return NULL;
+    }
+
+    ret = ArrayCreate();
+    while ((file = readdir(files)))
+    {
+        size_t namlen = strlen(file->d_name);
+
+        if (namlen > 5)
+        {
+            int nameOffset = namlen - 5;
+
+            if (StrEquals(file->d_name + nameOffset, ".json"))
+            {
+                file->d_name[nameOffset] = '\0';
+                StringArrayAppend(ret, file->d_name);
+            }
+        }
+    }
+    closedir(files);
+    Free(path);
+
+    pthread_mutex_unlock(&d->lock);
+    return ret;
+}
+static bool
+FlatExists(Db *d, Array *dir)
+{
+    FlatDb *db = (FlatDb *) d;
+    char *path;
+    bool ret;
+    if (!d || !dir)
+    {
+        return NULL;
+    }
+
+    pthread_mutex_lock(&d->lock);
+
+    path = DbFileName(db, dir);
+    ret = UtilLastModified(path) != 0;
+    Free(path);
+
+    pthread_mutex_unlock(&d->lock);
+
+    return ret;
+}
+
 Db *
 DbOpen(char *dir, size_t cache)
 {
@@ -268,6 +362,9 @@ DbOpen(char *dir, size_t cache)
     db->base.lockFunc = FlatLock;
     db->base.unlock = FlatUnlock;
     db->base.create = FlatCreate;
+    db->base.delete = FlatDelete;
+    db->base.exists = FlatExists;
+    db->base.list   = FlatList;
     db->base.close = NULL;
 
     return (Db *) db;

src/Db/Internal.h

@@ -64,11 +64,14 @@ struct Db
     DbRef *mostRecent;
     DbRef *leastRecent;
 
-    /* TODO: Functions for implementation-specific operations
+    /* Functions for implementation-specific operations
      * (opening a ref, closing a db, removing an entry, ...) */
     DbRef * (*lockFunc)(Db *, Array *);
     DbRef * (*create)(Db *, Array *);
+    Array * (*list)(Db *, Array *);
     bool (*unlock)(Db *, DbRef *);
+    bool (*delete)(Db *, Array *);
+    bool (*exists)(Db *, Array *);
     void (*close)(Db *);
 
     /* Implementation-specific constructs */
@@ -94,5 +97,6 @@ struct DbRef
 extern void DbInit(Db *);
 extern void DbRefInit(Db *, DbRef *);
 extern void StringArrayFree(Array *);
+extern void StringArrayAppend(Array *, char *);
 
 #endif