2 * This file contains a set of abstractions that allow Citadel to plug into any
3 * record manager or database system for its data store.
19 #include "sysdep_decls.h"
23 * This array holds one gdbm handle for each Citadel database.
25 GDBM_FILE gdbms[MAXCDB];
28 * We also keep these around, for sequential searches... (one per
29 * session. Maybe there's a better way?)
36 * Reclaim unused space in the databases. We need to do each one of
37 * these discretely, rather than in a loop.
39 void defrag_databases(void) {
41 /* defrag the message base */
42 begin_critical_section(S_MSGMAIN);
43 gdbm_reorganize(gdbms[CDB_MSGMAIN]);
44 end_critical_section(S_MSGMAIN);
46 /* defrag the user file, mailboxes, and user/room relationships */
47 begin_critical_section(S_USERSUPP);
48 gdbm_reorganize(gdbms[CDB_USERSUPP]);
49 gdbm_reorganize(gdbms[CDB_VISIT]);
50 end_critical_section(S_USERSUPP);
52 /* defrag the room files and message lists */
53 begin_critical_section(S_QUICKROOM);
54 gdbm_reorganize(gdbms[CDB_QUICKROOM]);
55 gdbm_reorganize(gdbms[CDB_MSGLISTS]);
56 end_critical_section(S_QUICKROOM);
58 /* defrag the floor table */
59 begin_critical_section(S_FLOORTAB);
60 gdbm_reorganize(gdbms[CDB_FLOORTAB]);
61 end_critical_section(S_FLOORTAB);
66 * Open the various gdbm databases we'll be using. Any database which
67 * does not exist should be created.
69 void open_databases(void) {
73 * Silently try to create the database subdirectory. If it's
74 * already there, no problem.
76 system("exec mkdir data 2>/dev/null");
78 gdbms[CDB_MSGMAIN] = gdbm_open("data/msgmain.gdbm", 8192,
79 GDBM_WRCREAT, 0600, NULL);
80 if (gdbms[CDB_MSGMAIN] == NULL) {
81 lprintf(2, "Cannot open msgmain: %s\n",
82 gdbm_strerror(gdbm_errno));
85 gdbms[CDB_USERSUPP] = gdbm_open("data/usersupp.gdbm", 0,
86 GDBM_WRCREAT, 0600, NULL);
87 if (gdbms[CDB_USERSUPP] == NULL) {
88 lprintf(2, "Cannot open usersupp: %s\n",
89 gdbm_strerror(gdbm_errno));
92 gdbms[CDB_VISIT] = gdbm_open("data/visit.gdbm", 0,
93 GDBM_WRCREAT, 0600, NULL);
94 if (gdbms[CDB_VISIT] == NULL) {
95 lprintf(2, "Cannot open visit file: %s\n",
96 gdbm_strerror(gdbm_errno));
99 gdbms[CDB_QUICKROOM] = gdbm_open("data/quickroom.gdbm", 0,
100 GDBM_WRCREAT, 0600, NULL);
101 if (gdbms[CDB_QUICKROOM] == NULL) {
102 lprintf(2, "Cannot open quickroom: %s\n",
103 gdbm_strerror(gdbm_errno));
106 gdbms[CDB_FLOORTAB] = gdbm_open("data/floortab.gdbm", 0,
107 GDBM_WRCREAT, 0600, NULL);
108 if (gdbms[CDB_FLOORTAB] == NULL) {
109 lprintf(2, "Cannot open floortab: %s\n",
110 gdbm_strerror(gdbm_errno));
113 gdbms[CDB_MSGLISTS] = gdbm_open("data/msglists.gdbm", 0,
114 GDBM_WRCREAT, 0600, NULL);
115 if (gdbms[CDB_MSGLISTS] == NULL) {
116 lprintf(2, "Cannot open msglists: %s\n",
117 gdbm_strerror(gdbm_errno));
120 for (a=0; a<MAXKEYS; ++a) {
122 dtkey[a].dptr = NULL;
129 * Close all of the gdbm database files we've opened. This can be done
130 * in a loop, since it's just a bunch of closes.
132 void close_databases(void) {
135 /* Hmm... we should decide when would be a good time to defrag.
136 * Server shutdowns might be an opportune time.
138 /* defrag_databases(); */
140 for (a=0; a<MAXCDB; ++a) {
141 lprintf(7, "Closing database %d\n", a);
142 gdbm_close(gdbms[a]);
145 for (a=0; a<MAXKEYS; ++a) {
146 if (dtkey[a].dptr != NULL) {
155 * Store a piece of data. Returns 0 if the operation was successful. If a
156 * datum already exists it should be overwritten.
158 int cdb_store(int cdb,
159 void *key, int keylen,
160 void *data, int datalen) {
166 ddata.dsize = datalen;
169 if ( gdbm_store(gdbms[cdb], dkey, ddata, GDBM_REPLACE) < 0 ) {
170 lprintf(2, "gdbm error: %s\n", gdbm_strerror(gdbm_errno));
179 * Delete a piece of data. Returns 0 if the operation was successful.
181 int cdb_delete(int cdb, void *key, int keylen) {
188 return(gdbm_delete(gdbms[cdb], dkey));
196 * Fetch a piece of data. If not found, returns NULL. Otherwise, it returns
197 * a struct cdbdata which it is the caller's responsibility to free later on
198 * using the cdb_free() routine.
200 struct cdbdata *cdb_fetch(int cdb, void *key, int keylen) {
202 struct cdbdata *tempcdb;
208 dret = gdbm_fetch(gdbms[cdb], dkey);
209 if (dret.dptr == NULL) {
213 tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
214 if (tempcdb == NULL) {
215 lprintf(2, "Cannot allocate memory!\n");
218 tempcdb->len = dret.dsize;
219 tempcdb->ptr = dret.dptr;
225 * Free a cdbdata item (ok, this is really no big deal, but we might need to do
226 * more complex stuff with other database managers in the future).
228 void cdb_free(struct cdbdata *cdb) {
235 * Prepare for a sequential search of an entire database. (In the gdbm model,
236 * we do this by keeping an array dtkey[] of "the next" key for each session
237 * that is open. There is guaranteed to be no more than one traversal in
238 * progress per session at any given time.)
240 void cdb_rewind(int cdb) {
242 if (dtkey[CC->cs_pid].dptr != NULL) {
243 free(dtkey[CC->cs_pid].dptr);
246 dtkey[CC->cs_pid] = gdbm_firstkey(gdbms[cdb]);
251 * Fetch the next item in a sequential search. Returns a pointer to a
252 * cdbdata structure, or NULL if we've hit the end.
254 struct cdbdata *cdb_next_item(int cdb) {
256 struct cdbdata *cdbret;
259 if (dtkey[CC->cs_pid].dptr == NULL) { /* end of file */
263 dret = gdbm_fetch(gdbms[cdb], dtkey[CC->cs_pid]);
264 if (dret.dptr == NULL) { /* bad read */
265 free(dtkey[CC->cs_pid].dptr);
269 cdbret = (struct cdbdata *) malloc(sizeof(struct cdbdata));
270 cdbret->len = dret.dsize;
271 cdbret->ptr = dret.dptr;
273 dtkey[CC->cs_pid] = gdbm_nextkey(gdbms[cdb], dtkey[CC->cs_pid]);