+++ /dev/null
-/*
- * This file contains a set of abstractions that allow Citadel to plug into any
- * record manager or database system for its data store.
- */
-
-
-#include <stdlib.h>
-#include <unistd.h>
-#include <stdio.h>
-#include <time.h>
-#include <ctype.h>
-#include <string.h>
-#include <errno.h>
-#include <pthread.h>
-#include <gdbm.h>
-#include "citadel.h"
-#include "server.h"
-#include "database.h"
-#include "sysdep_decls.h"
-
-
-/*
- * This array holds one gdbm handle for each Citadel database.
- */
-GDBM_FILE gdbms[MAXCDB];
-
-/*
- * We also keep these around, for sequential searches... (one per
- * session. Maybe there's a better way?)
- */
-#define MAXKEYS 256
-datum dtkey[MAXKEYS];
-
-
-/*
- * Reclaim unused space in the databases. We need to do each one of
- * these discretely, rather than in a loop.
- */
-void defrag_databases(void) {
-
- /* defrag the message base */
- begin_critical_section(S_MSGMAIN);
- gdbm_reorganize(gdbms[CDB_MSGMAIN]);
- end_critical_section(S_MSGMAIN);
-
- /* defrag the user file, mailboxes, and user/room relationships */
- begin_critical_section(S_USERSUPP);
- gdbm_reorganize(gdbms[CDB_USERSUPP]);
- gdbm_reorganize(gdbms[CDB_MAILBOXES]);
- gdbm_reorganize(gdbms[CDB_VISIT]);
- end_critical_section(S_USERSUPP);
-
- /* defrag the room files and message lists */
- begin_critical_section(S_QUICKROOM);
- gdbm_reorganize(gdbms[CDB_QUICKROOM]);
- gdbm_reorganize(gdbms[CDB_MSGLISTS]);
- end_critical_section(S_QUICKROOM);
-
- /* defrag the floor table */
- begin_critical_section(S_FLOORTAB);
- gdbm_reorganize(gdbms[CDB_FLOORTAB]);
- end_critical_section(S_FLOORTAB);
- }
-
-
-/*
- * Open the various gdbm databases we'll be using. Any database which
- * does not exist should be created.
- */
-void open_databases(void) {
- int a;
-
- /*
- * Silently try to create the database subdirectory. If it's
- * already there, no problem.
- */
- system("exec mkdir data 2>/dev/null");
-
- gdbms[CDB_MSGMAIN] = gdbm_open("data/msgmain.gdbm", 8192,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_MSGMAIN] == NULL) {
- lprintf(2, "Cannot open msgmain: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- gdbms[CDB_USERSUPP] = gdbm_open("data/usersupp.gdbm", 0,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_USERSUPP] == NULL) {
- lprintf(2, "Cannot open usersupp: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- gdbms[CDB_VISIT] = gdbm_open("data/visit.gdbm", 0,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_VISIT] == NULL) {
- lprintf(2, "Cannot open visit file: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- gdbms[CDB_QUICKROOM] = gdbm_open("data/quickroom.gdbm", 0,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_QUICKROOM] == NULL) {
- lprintf(2, "Cannot open quickroom: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- gdbms[CDB_FLOORTAB] = gdbm_open("data/floortab.gdbm", 0,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_FLOORTAB] == NULL) {
- lprintf(2, "Cannot open floortab: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- gdbms[CDB_MSGLISTS] = gdbm_open("data/msglists.gdbm", 0,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_MSGLISTS] == NULL) {
- lprintf(2, "Cannot open msglists: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- gdbms[CDB_MAILBOXES] = gdbm_open("data/mailboxes.gdbm", 0,
- GDBM_WRCREAT, 0600, NULL);
- if (gdbms[CDB_MAILBOXES] == NULL) {
- lprintf(2, "Cannot open mailboxes: %s\n",
- gdbm_strerror(gdbm_errno));
- }
-
- for (a=0; a<MAXKEYS; ++a) {
- dtkey[a].dsize = 0;
- dtkey[a].dptr = NULL;
- }
-
- }
-
-
-/*
- * Close all of the gdbm database files we've opened. This can be done
- * in a loop, since it's just a bunch of closes.
- */
-void close_databases(void) {
- int a;
-
- /* Hmm... we should decide when would be a good time to defrag.
- * Server shutdowns might be an opportune time.
- defrag_databases(); */
-
- for (a=0; a<MAXCDB; ++a) {
- lprintf(7, "Closing database %d\n", a);
- gdbm_close(gdbms[a]);
- }
-
- for (a=0; a<MAXKEYS; ++a) {
- if (dtkey[a].dptr != NULL) {
- free(dtkey[a].dptr);
- }
- }
-
- }
-
-
-/*
- * Store a piece of data. Returns 0 if the operation was successful. If a
- * datum already exists it should be overwritten.
- */
-int cdb_store(int cdb,
- void *key, int keylen,
- void *data, int datalen) {
-
- datum dkey, ddata;
-
- dkey.dsize = keylen;
- dkey.dptr = key;
- ddata.dsize = datalen;
- ddata.dptr = data;
-
- if ( gdbm_store(gdbms[cdb], dkey, ddata, GDBM_REPLACE) < 0 ) {
- lprintf(2, "gdbm error: %s\n", gdbm_strerror(gdbm_errno));
- return(-1);
- }
-
- return(0);
- }
-
-
-/*
- * Delete a piece of data. Returns 0 if the operation was successful.
- */
-int cdb_delete(int cdb, void *key, int keylen) {
-
- datum dkey;
-
- dkey.dsize = keylen;
- dkey.dptr = key;
-
- return(gdbm_delete(gdbms[cdb], dkey));
-
- }
-
-
-
-
-/*
- * Fetch a piece of data. If not found, returns NULL. Otherwise, it returns
- * a struct cdbdata which it is the caller's responsibility to free later on
- * using the cdb_free() routine.
- */
-struct cdbdata *cdb_fetch(int cdb, void *key, int keylen) {
-
- struct cdbdata *tempcdb;
- datum dkey, dret;
-
- dkey.dsize = keylen;
- dkey.dptr = key;
-
- dret = gdbm_fetch(gdbms[cdb], dkey);
- if (dret.dptr == NULL) {
- return NULL;
- }
-
- tempcdb = (struct cdbdata *) malloc(sizeof(struct cdbdata));
- if (tempcdb == NULL) {
- lprintf(2, "Cannot allocate memory!\n");
- }
-
- tempcdb->len = dret.dsize;
- tempcdb->ptr = dret.dptr;
- return(tempcdb);
- }
-
-
-/*
- * Free a cdbdata item (ok, this is really no big deal, but we might need to do
- * more complex stuff with other database managers in the future).
- */
-void cdb_free(struct cdbdata *cdb) {
- free(cdb->ptr);
- free(cdb);
- }
-
-
-/*
- * Prepare for a sequential search of an entire database. (In the gdbm model,
- * we do this by keeping an array dtkey[] of "the next" key for each session
- * that is open. There is guaranteed to be no more than one traversal in
- * progress per session at any given time.)
- */
-void cdb_rewind(int cdb) {
-
- if (dtkey[CC->cs_pid].dptr != NULL) {
- free(dtkey[CC->cs_pid].dptr);
- }
-
- dtkey[CC->cs_pid] = gdbm_firstkey(gdbms[cdb]);
- }
-
-
-/*
- * Fetch the next item in a sequential search. Returns a pointer to a
- * cdbdata structure, or NULL if we've hit the end.
- */
-struct cdbdata *cdb_next_item(int cdb) {
- datum dret;
- struct cdbdata *cdbret;
-
-
- if (dtkey[CC->cs_pid].dptr == NULL) { /* end of file */
- return NULL;
- }
-
- dret = gdbm_fetch(gdbms[cdb], dtkey[CC->cs_pid]);
- if (dret.dptr == NULL) { /* bad read */
- free(dtkey[CC->cs_pid].dptr);
- return NULL;
- }
-
- cdbret = (struct cdbdata *) malloc(sizeof(struct cdbdata));
- cdbret->len = dret.dsize;
- cdbret->ptr = dret.dptr;
-
- dtkey[CC->cs_pid] = gdbm_nextkey(gdbms[cdb], dtkey[CC->cs_pid]);
- return(cdbret);
- }
projects / citadel.git / blobdiff