1 /*
2   Copyright 2021 Northern.tech AS
3 
4   This file is part of CFEngine 3 - written and maintained by Northern.tech AS.
5 
6   This program is free software; you can redistribute it and/or modify it
7   under the terms of the GNU General Public License as published by the
8   Free Software Foundation; version 3.
9 
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14 
15   You should have received a copy of the GNU General Public License
16   along with this program; if not, write to the Free Software
17   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
18 
19   To the extent this program is licensed as part of the Enterprise
20   versions of CFEngine, the applicable Commercial Open Source License
21   (COSL) may apply to this file if you as a licensee so wish it. See
22   included file COSL.txt.
23 */
24 
25 #ifndef CFENGINE_DBM_PRIV_H
26 #define CFENGINE_DBM_PRIV_H
27 
28 #include <dbm_api_types.h>
29 /* DBM implementation is supposed to define the following structures and
30  * implement the following functions */
31 
32 typedef struct DBPriv_ DBPriv;
33 typedef struct DBCursorPriv_ DBCursorPriv;
34 
35 const char *DBPrivGetFileExtension(void);
36 
37 #define DB_PRIV_DATABASE_BROKEN ((DBPriv *)-1)
38 
39 void DBPrivSetMaximumConcurrentTransactions(int max_txn);
40 
41 /*
42  * These two functions will always be called with a per-database lock held.
43  */
44 
45 /*
46  * Should return either
47  * - NULL in case of generic error
48  * - DB_PRIV_DATABASE_BROKEN in case database file is broken, need to be moved
49       away and attempt to open database again should be performed.
50  * - valid pointer to DBPriv * in case database was opened successfully.
51  */
52 DBPriv *DBPrivOpenDB(const char *dbpath, dbid id);
53 void DBPrivCloseDB(DBPriv *hdbp);
54 void DBPrivCommit(DBPriv *hdbp);
55 bool DBPrivClean(DBPriv *hdbp);
56 
57 bool DBPrivHasKey(DBPriv *db, const void *key, int key_size);
58 int DBPrivGetValueSize(DBPriv *db, const void *key, int key_size);
59 
60 bool DBPrivRead(DBPriv *db, const void *key, int key_size,
61             void *dest, size_t dest_size);
62 
63 bool DBPrivWrite(DBPriv *db, const void *key, int key_size,
64              const void *value, int value_size);
65 
66 bool DBPrivOverwrite(DBPriv *handle,
67                      const char *key, int key_size,
68                      const void *value, size_t value_size,
69                      OverwriteCondition Condition, void *data);
70 
71 bool DBPrivDelete(DBPriv *db, const void *key, int key_size);
72 
73 
74 DBCursorPriv *DBPrivOpenCursor(DBPriv *db);
75 bool DBPrivAdvanceCursor(DBCursorPriv *cursor, void **key, int *key_size,
76                      void **value, int *value_size);
77 bool DBPrivDeleteCursorEntry(DBCursorPriv *cursor);
78 bool DBPrivWriteCursorEntry(DBCursorPriv *cursor, const void *value, int value_size);
79 void DBPrivCloseCursor(DBCursorPriv *cursor);
80 
81 /**
82  * @brief Check a database file for consistency
83  * @param dbpath Path to database file
84  * @return NULL if successful, else an error string that must be freed
85  */
86 char *DBPrivDiagnose(const char *dbpath);
87 
88 #endif
89