NeoMutt  2025-05-10
Teaching an old dog new tricks
 		DOXYGEN
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tdb.c
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1
31#include "config.h"
32#include <fcntl.h>
33#include <stdbool.h>
34#include <stddef.h>
35#include <tdb.h>
36#include "mutt/lib.h"
37#include "lib.h"
38
42static StoreHandle *store_tdb_open(const char *path, bool create)
43{
44 if (!path)
45 return NULL;
46
47 /* TDB_NOLOCK - Don't do any locking
48 * TDB_NOSYNC - Don't use synchronous transactions
49 * TDB_INCOMPATIBLE_HASH - Better hashing
50 */
51 const int flags = TDB_NOLOCK | TDB_INCOMPATIBLE_HASH | TDB_NOSYNC;
52 const int hash_size = 33533; // Based on test timings for 100K emails
53
54 struct tdb_context *db = tdb_open(path, hash_size, flags,
55 (create ? O_CREAT : 0) | O_RDWR, 00600);
56
57 // Return an opaque pointer
58 return (StoreHandle *) db;
59}
60
64static void *store_tdb_fetch(StoreHandle *store, const char *key, size_t klen, size_t *vlen)
65{
66 if (!store)
67 return NULL;
68
69 // Decloak an opaque pointer
70 TDB_CONTEXT *db = store;
71 TDB_DATA dkey;
72 TDB_DATA data;
73
74 dkey.dptr = (unsigned char *) key;
75 dkey.dsize = klen;
76 data = tdb_fetch(db, dkey);
77
78 *vlen = data.dsize;
79 return data.dptr;
80}
81
85static void store_tdb_free(StoreHandle *store, void **ptr)
86{
87 FREE(ptr);
88}
89
93static int store_tdb_store(StoreHandle *store, const char *key, size_t klen,
94 void *value, size_t vlen)
95{
96 if (!store)
97 return -1;
98
99 // Decloak an opaque pointer
100 TDB_CONTEXT *db = store;
101 TDB_DATA dkey;
102 TDB_DATA databuf;
103
104 dkey.dptr = (unsigned char *) key;
105 dkey.dsize = klen;
106
107 databuf.dsize = vlen;
108 databuf.dptr = value;
109
110 return tdb_store(db, dkey, databuf, TDB_INSERT);
111}
112
116static int store_tdb_delete_record(StoreHandle *store, const char *key, size_t klen)
117{
118 if (!store)
119 return -1;
120
121 // Decloak an opaque pointer
122 TDB_CONTEXT *db = store;
123 TDB_DATA dkey;
124
125 dkey.dptr = (unsigned char *) key;
126 dkey.dsize = klen;
127
128 return tdb_delete(db, dkey);
129}
130
134static void store_tdb_close(StoreHandle **ptr)
135{
136 if (!ptr || !*ptr)
137 return;
138
139 // Decloak an opaque pointer
140 TDB_CONTEXT *db = *ptr;
141 tdb_close(db);
142 *ptr = NULL;
143}
144
148static const char *store_tdb_version(void)
149{
150 // TDB doesn't supply any version info
151 return "tdb";
152}
153
154STORE_BACKEND_OPS(tdb)
store_tdb_close
static void store_tdb_close(StoreHandle **ptr)
Close a Store connection - Implements StoreOps::close() -.
Definition: tdb.c:134
store_tdb_delete_record
static int store_tdb_delete_record(StoreHandle *store, const char *key, size_t klen)
Delete a record from the Store - Implements StoreOps::delete_record() -.
Definition: tdb.c:116
store_tdb_fetch
static void * store_tdb_fetch(StoreHandle *store, const char *key, size_t klen, size_t *vlen)
Fetch a Value from the Store - Implements StoreOps::fetch() -.
Definition: tdb.c:64
store_tdb_free
static void store_tdb_free(StoreHandle *store, void **ptr)
Free a Value returned by fetch() - Implements StoreOps::free() -.
Definition: tdb.c:85
store_tdb_open
static StoreHandle * store_tdb_open(const char *path, bool create)
Open a connection to a Store - Implements StoreOps::open() -.
Definition: tdb.c:42
store_tdb_store
static int store_tdb_store(StoreHandle *store, const char *key, size_t klen, void *value, size_t vlen)
Write a Value to the Store - Implements StoreOps::store() -.
Definition: tdb.c:93
store_tdb_version
static const char * store_tdb_version(void)
Get a Store version string - Implements StoreOps::version() -.
Definition: tdb.c:148
FREE
#define FREE(x)
Definition: memory.h:55
lib.h
Convenience wrapper for the library headers.
lib.h
Key value store.
StoreHandle
void StoreHandle
Opaque type for store backend.
Definition: lib.h:61
STORE_BACKEND_OPS
#define STORE_BACKEND_OPS(_name)
Definition: lib.h:163