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5bde3efa ACK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
1e1ddfac JH |
5 | /* Copyright (c) University of Cambridge 2016 - 2018 */ |
6 | /* Copyright (c) The Exim Maintainers 2020 */ | |
5bde3efa ACK |
7 | /* See the file NOTICE for conditions of use and distribution. */ |
8 | ||
9 | #include "../exim.h" | |
10 | ||
11 | #ifdef EXPERIMENTAL_LMDB | |
12 | ||
13 | #include <lmdb.h> | |
14 | ||
15 | typedef struct lmdbstrct | |
16 | { | |
17 | MDB_txn *txn; | |
18 | MDB_dbi db_dbi; | |
19 | } Lmdbstrct; | |
20 | ||
21 | ||
22 | /************************************************* | |
23 | * Open entry point * | |
24 | *************************************************/ | |
25 | ||
26 | static void * | |
d447dbd1 | 27 | lmdb_open(const uschar * filename, uschar ** errmsg) |
5bde3efa ACK |
28 | { |
29 | MDB_env * db_env = NULL; | |
30 | Lmdbstrct * lmdb_p; | |
31 | int ret, save_errno; | |
32 | const uschar * errstr; | |
33 | ||
f3ebb786 | 34 | lmdb_p = store_get(sizeof(Lmdbstrct), FALSE); |
5bde3efa ACK |
35 | lmdb_p->txn = NULL; |
36 | ||
37 | if ((ret = mdb_env_create(&db_env))) | |
38 | { | |
39 | errstr = US"create environment"; | |
40 | goto bad; | |
41 | } | |
42 | ||
43 | if ((ret = mdb_env_open(db_env, CS filename, MDB_NOSUBDIR|MDB_RDONLY, 0660))) | |
44 | { | |
a3382e87 | 45 | errstr = string_sprintf("open environment with %s", filename); |
5bde3efa ACK |
46 | goto bad; |
47 | } | |
48 | ||
49 | if ((ret = mdb_txn_begin(db_env, NULL, MDB_RDONLY, &lmdb_p->txn))) | |
50 | { | |
51 | errstr = US"start transaction"; | |
52 | goto bad; | |
53 | } | |
54 | ||
55 | if ((ret = mdb_open(lmdb_p->txn, NULL, 0, &lmdb_p->db_dbi))) | |
56 | { | |
57 | errstr = US"open database"; | |
58 | goto bad; | |
59 | } | |
60 | ||
61 | return lmdb_p; | |
62 | ||
63 | bad: | |
64 | save_errno = errno; | |
65 | if (lmdb_p->txn) mdb_txn_abort(lmdb_p->txn); | |
66 | if (db_env) mdb_env_close(db_env); | |
67 | *errmsg = string_sprintf("LMDB: Unable to %s: %s", errstr, mdb_strerror(ret)); | |
68 | errno = save_errno; | |
69 | return NULL; | |
70 | } | |
71 | ||
72 | ||
73 | /************************************************* | |
74 | * Find entry point * | |
75 | *************************************************/ | |
76 | ||
77 | static int | |
d447dbd1 | 78 | lmdb_find(void * handle, const uschar * filename, |
5bde3efa | 79 | const uschar * keystring, int length, uschar ** result, uschar ** errmsg, |
67a57a5a | 80 | uint * do_cache, const uschar * opts) |
5bde3efa ACK |
81 | { |
82 | int ret; | |
83 | MDB_val dbkey, data; | |
84 | Lmdbstrct * lmdb_p = handle; | |
85 | ||
86 | dbkey.mv_data = CS keystring; | |
87 | dbkey.mv_size = length; | |
88 | ||
42c7f0b4 | 89 | DEBUG(D_lookup) debug_printf_indent("LMDB: lookup key: %s\n", CS keystring); |
5bde3efa ACK |
90 | |
91 | if ((ret = mdb_get(lmdb_p->txn, lmdb_p->db_dbi, &dbkey, &data)) == 0) | |
92 | { | |
93 | *result = string_copyn(US data.mv_data, data.mv_size); | |
42c7f0b4 | 94 | DEBUG(D_lookup) debug_printf_indent("LMDB: lookup result: %s\n", *result); |
5bde3efa ACK |
95 | return OK; |
96 | } | |
97 | else if (ret == MDB_NOTFOUND) | |
98 | { | |
99 | *errmsg = US"LMDB: lookup, no data found"; | |
42c7f0b4 | 100 | DEBUG(D_lookup) debug_printf_indent("%s\n", *errmsg); |
5bde3efa ACK |
101 | return FAIL; |
102 | } | |
103 | else | |
104 | { | |
105 | *errmsg = string_sprintf("LMDB: lookup error: %s", mdb_strerror(ret)); | |
42c7f0b4 | 106 | DEBUG(D_lookup) debug_printf_indent("%s\n", *errmsg); |
5bde3efa ACK |
107 | return DEFER; |
108 | } | |
109 | } | |
110 | ||
111 | ||
112 | /************************************************* | |
113 | * Close entry point * | |
114 | *************************************************/ | |
115 | ||
116 | static void | |
117 | lmdb_close(void * handle) | |
118 | { | |
119 | Lmdbstrct * lmdb_p = handle; | |
120 | MDB_env * db_env = mdb_txn_env(lmdb_p->txn); | |
121 | mdb_txn_abort(lmdb_p->txn); | |
122 | mdb_env_close(db_env); | |
123 | } | |
124 | ||
125 | ||
126 | /************************************************* | |
127 | * Version reporting entry point * | |
128 | *************************************************/ | |
129 | ||
130 | #include "../version.h" | |
131 | ||
132 | void | |
133 | lmdb_version_report(FILE * f) | |
134 | { | |
135 | fprintf(f, "Library version: LMDB: Compile: %d.%d.%d\n", | |
136 | MDB_VERSION_MAJOR, MDB_VERSION_MINOR, MDB_VERSION_PATCH); | |
137 | #ifdef DYNLOOKUP | |
138 | fprintf(f, " Exim version %s\n", EXIM_VERSION_STR); | |
139 | #endif | |
140 | } | |
141 | ||
142 | static lookup_info lmdb_lookup_info = { | |
9f400174 JH |
143 | .name = US"lmdb", /* lookup name */ |
144 | .type = lookup_absfile, /* query-style lookup */ | |
145 | .open = lmdb_open, /* open function */ | |
146 | .check = NULL, /* no check function */ | |
147 | .find = lmdb_find, /* find function */ | |
148 | .close = lmdb_close, /* close function */ | |
149 | .tidy = NULL, /* tidy function */ | |
150 | .quote = NULL, /* quoting function */ | |
151 | .version_report = lmdb_version_report /* version reporting */ | |
5bde3efa ACK |
152 | }; |
153 | ||
154 | #ifdef DYNLOOKUP | |
155 | # define lmdb_lookup_module_info _lookup_module_info | |
156 | #endif /* DYNLOOKUP */ | |
157 | ||
158 | static lookup_info *_lookup_list[] = { &lmdb_lookup_info }; | |
159 | lookup_module_info lmdb_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
160 | ||
161 | #endif /* EXPERIMENTAL_LMDB */ |