lib/dbwrap/dbwrap.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Database interface wrapper around tdb
   4    Copyright (C) Volker Lendecke 2005-2007
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef __DBWRAP_H__
  21 #define __DBWRAP_H__
  22
  23 #include "replace.h"
  24 #include <talloc.h>
  25 #include <tevent.h>
  26 #include "libcli/util/ntstatus.h"
  27 #include "tdb.h"
  28
  29 struct db_record;
  30 struct db_context;
  31
  32 enum dbwrap_lock_order {
  33         DBWRAP_LOCK_ORDER_NONE = 0, /* Don't check lock orders for this db. */
  34         /*
  35          * We only allow orders 1, 2, 3:
  36          * These are the orders that CTDB currently supports.
  37          */
  38         DBWRAP_LOCK_ORDER_1 = 1,
  39         DBWRAP_LOCK_ORDER_2 = 2,
  40         DBWRAP_LOCK_ORDER_3 = 3
  41 };
  42
  43 #define DBWRAP_FLAG_NONE                     0x0000000000000000ULL
  44 #define DBWRAP_FLAG_OPTIMIZE_READONLY_ACCESS 0x0000000000000001ULL
  45
  46 enum dbwrap_req_state {
  47         /**
  48          * We are creating the request
  49          */
  50         DBWRAP_REQ_INIT,
  51         /**
  52          * The request is queued and waiting to be dispatched
  53          */
  54         DBWRAP_REQ_QUEUED,
  55         /**
  56          * We are waiting to receive the reply
  57          */
  58         DBWRAP_REQ_DISPATCHED,
  59         /**
  60          * The request is finished
  61          */
  62         DBWRAP_REQ_DONE,
  63         /**
  64          * The request errored out
  65          */
  66         DBWRAP_REQ_ERROR
  67 };
  68
  69 /* The following definitions come from lib/dbwrap.c  */
  70
  71 TDB_DATA dbwrap_record_get_key(const struct db_record *rec);
  72 TDB_DATA dbwrap_record_get_value(const struct db_record *rec);
  73 NTSTATUS dbwrap_record_store(struct db_record *rec, TDB_DATA data, int flags);
  74 NTSTATUS dbwrap_record_storev(struct db_record *rec,
  75                               const TDB_DATA *dbufs, int num_dbufs, int flags);
  76 NTSTATUS dbwrap_record_delete(struct db_record *rec);
  77 struct db_record *dbwrap_fetch_locked(struct db_context *db,
  78                                       TALLOC_CTX *mem_ctx,
  79                                       TDB_DATA key);
  80 struct db_record *dbwrap_try_fetch_locked(struct db_context *db,
  81                                           TALLOC_CTX *mem_ctx,
  82                                           TDB_DATA key);
  83 struct db_context *dbwrap_record_get_db(struct db_record *rec);
  84
  85 NTSTATUS dbwrap_do_locked(struct db_context *db, TDB_DATA key,
  86                           void (*fn)(struct db_record *rec,
  87                                      void *private_data),
  88                           void *private_data);
  89
  90 NTSTATUS dbwrap_delete(struct db_context *db, TDB_DATA key);
  91 NTSTATUS dbwrap_store(struct db_context *db, TDB_DATA key,
  92                       TDB_DATA data, int flags);
  93 NTSTATUS dbwrap_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
  94                       TDB_DATA key, TDB_DATA *value);
  95 bool dbwrap_exists(struct db_context *db, TDB_DATA key);
  96 NTSTATUS dbwrap_traverse(struct db_context *db,
  97                          int (*f)(struct db_record*, void*),
  98                          void *private_data,
  99                          int *count);
 100 NTSTATUS dbwrap_traverse_read(struct db_context *db,
 101                               int (*f)(struct db_record*, void*),
 102                               void *private_data,
 103                               int *count);
 104 NTSTATUS dbwrap_parse_record(struct db_context *db, TDB_DATA key,
 105                              void (*parser)(TDB_DATA key, TDB_DATA data,
 106                                             void *private_data),
 107                              void *private_data);
 108 /**
 109  * Async implementation of dbwrap_parse_record
 110  *
 111  * @param[in]  mem_ctx      talloc memory context to use.
 112  *
 113  * @param[in]  ev           tevent context to use
 114  *
 115  * @param[in]  db           Database to query
 116  *
 117  * @param[in]  key          Record key, the function makes a copy of this
 118  *
 119  * @param[in]  parser       Parser callback function
 120  *
 121  * @param[in]  private_data Private data for the callback function
 122  *
 123  * @param[out] req_state    Pointer to a enum dbwrap_req_state variable
 124  *
 125  * @note req_state is updated in the send function. To determine the final
 126  * result of the request the caller should therefor not rely on req_state. The
 127  * primary use case is to give the caller an indication whether the request is
 128  * already sent to ctdb (DBWRAP_REQ_DISPATCHED) or if it's still stuck in the
 129  * sendqueue (DBWRAP_REQ_QUEUED).
 130  **/
 131 struct tevent_req *dbwrap_parse_record_send(
 132         TALLOC_CTX *mem_ctx,
 133         struct tevent_context *ev,
 134         struct db_context *db,
 135         TDB_DATA key,
 136         void (*parser)(TDB_DATA key, TDB_DATA data, void *private_data),
 137         void *private_data,
 138         enum dbwrap_req_state *req_state);
 139 NTSTATUS dbwrap_parse_record_recv(struct tevent_req *req);
 140 int dbwrap_wipe(struct db_context *db);
 141 int dbwrap_check(struct db_context *db);
 142 int dbwrap_get_seqnum(struct db_context *db);
 143 /* Returns 0 if unknown. */
 144 int dbwrap_transaction_start(struct db_context *db);
 145 NTSTATUS dbwrap_transaction_start_nonblock(struct db_context *db);
 146 int dbwrap_transaction_commit(struct db_context *db);
 147 int dbwrap_transaction_cancel(struct db_context *db);
 148 size_t dbwrap_db_id(struct db_context *db, uint8_t *id, size_t idlen);
 149 bool dbwrap_is_persistent(struct db_context *db);
 150 const char *dbwrap_name(struct db_context *db);
 151
 152 /* The following definitions come from lib/dbwrap_util.c  */
 153
 154 NTSTATUS dbwrap_purge(struct db_context *db, TDB_DATA key);
 155 NTSTATUS dbwrap_purge_bystring(struct db_context *db, const char *key);
 156 NTSTATUS dbwrap_delete_bystring(struct db_context *db, const char *key);
 157 NTSTATUS dbwrap_store_bystring(struct db_context *db, const char *key,
 158                                TDB_DATA data, int flags);
 159 NTSTATUS dbwrap_fetch_bystring(struct db_context *db, TALLOC_CTX *mem_ctx,
 160                                const char *key, TDB_DATA *value);
 161
 162 NTSTATUS dbwrap_fetch_int32(struct db_context *db, TDB_DATA key,
 163                             int32_t *result);
 164 NTSTATUS dbwrap_fetch_int32_bystring(struct db_context *db, const char *keystr,
 165                                      int32_t *result);
 166 NTSTATUS dbwrap_store_int32_bystring(struct db_context *db, const char *keystr,
 167                                      int32_t v);
 168 NTSTATUS dbwrap_fetch_uint32_bystring(struct db_context *db,
 169                                       const char *keystr, uint32_t *val);
 170 NTSTATUS dbwrap_store_uint32_bystring(struct db_context *db,
 171                                       const char *keystr, uint32_t v);
 172 NTSTATUS dbwrap_change_uint32_atomic_bystring(struct db_context *db,
 173                                               const char *keystr,
 174                                               uint32_t *oldval,
 175                                               uint32_t change_val);
 176 NTSTATUS dbwrap_trans_change_uint32_atomic_bystring(struct db_context *db,
 177                                                     const char *keystr,
 178                                                     uint32_t *oldval,
 179                                                     uint32_t change_val);
 180 NTSTATUS dbwrap_change_int32_atomic(struct db_context *db,
 181                                     TDB_DATA key,
 182                                     int32_t *oldval,
 183                                     int32_t change_val);
 184 NTSTATUS dbwrap_change_int32_atomic_bystring(struct db_context *db,
 185                                              const char *keystr,
 186                                              int32_t *oldval,
 187                                              int32_t change_val);
 188 NTSTATUS dbwrap_trans_change_int32_atomic_bystring(struct db_context *db,
 189                                                    const char *keystr,
 190                                                    int32_t *oldval,
 191                                                    int32_t change_val);
 192 NTSTATUS dbwrap_trans_store(struct db_context *db, TDB_DATA key, TDB_DATA dbuf,
 193                             int flag);
 194 NTSTATUS dbwrap_trans_delete(struct db_context *db, TDB_DATA key);
 195 NTSTATUS dbwrap_trans_store_int32_bystring(struct db_context *db,
 196                                            const char *keystr,
 197                                            int32_t v);
 198 NTSTATUS dbwrap_trans_store_uint32_bystring(struct db_context *db,
 199                                             const char *keystr,
 200                                             uint32_t v);
 201 NTSTATUS dbwrap_trans_store_bystring(struct db_context *db, const char *key,
 202                                      TDB_DATA data, int flags);
 203 NTSTATUS dbwrap_trans_delete_bystring(struct db_context *db, const char *key);
 204 NTSTATUS dbwrap_trans_do(struct db_context *db,
 205                          NTSTATUS (*action)(struct db_context *, void *),
 206                          void *private_data);
 207 NTSTATUS dbwrap_trans_traverse(struct db_context *db,
 208                                int (*f)(struct db_record*, void*),
 209                                void *private_data);
 210
 211 NTSTATUS dbwrap_delete_bystring_upper(struct db_context *db, const char *key);
 212 NTSTATUS dbwrap_store_bystring_upper(struct db_context *db, const char *key,
 213                                      TDB_DATA data, int flags);
 214 NTSTATUS dbwrap_fetch_bystring_upper(struct db_context *db, TALLOC_CTX *mem_ctx,
 215                                      const char *key, TDB_DATA *value);
 216
 217 size_t dbwrap_marshall(struct db_context *db, uint8_t *buf, size_t bufsize);
 218 NTSTATUS dbwrap_parse_marshall_buf(const uint8_t *buf, size_t buflen,
 219                                    bool (*fn)(TDB_DATA key, TDB_DATA value,
 220                                               void *private_data),
 221                                    void *private_data);
 222 NTSTATUS dbwrap_unmarshall(struct db_context *db, const uint8_t *buf,
 223                            size_t buflen);
 224
 225 TDB_DATA dbwrap_merge_dbufs(TALLOC_CTX *mem_ctx,
 226                             const TDB_DATA *dbufs, int num_dbufs);
 227
 228
 229 /**
 230  * This opens a tdb file
 231  */
 232 struct db_context *dbwrap_local_open(TALLOC_CTX *mem_ctx,
 233                                      const char *name,
 234                                      int hash_size, int tdb_flags,
 235                                      int open_flags, mode_t mode,
 236                                      enum dbwrap_lock_order lock_order,
 237                                      uint64_t dbwrap_flags);
 238
 239 #endif /* __DBWRAP_H__ */