/* Remove all keys from all the databases in a Redis server.
* If callback is given the function is called from time to time to
* signal that work is in progress.
*
* The dbnum can be -1 if all teh DBs should be flushed, or the specified
* DB number if we want to flush only a single Redis database number.
*
* Flags are be EMPTYDB_NO_FLAGS if no special flags are specified or
* EMPTYDB_ASYNC if we want the memory to be freed in a different thread
* and the function to return ASAP.
*
* On success the fuction returns the number of keys removed from the
* database(s). Otherwise -1 is returned in the specific case the
* DB number is out of range, and errno is set to EINVAL. */
long long emptyDb(int dbnum, int flags, void(callback)(void*)) {
int j, async = (flags & EMPTYDB_ASYNC);
long long removed = 0;
if (dbnum < -1 || dbnum >= server.dbnum) {
errno = EINVAL;
return -1;
}
for (j = 0; j < server.dbnum; j++) {
if (dbnum != -1 && dbnum != j) continue;
removed += dictSize(server.db[j].dict);
if (async) {
emptyDbAsync(&server.db[j]);
} else {
dictEmpty(server.db[j].dict,callback);
dictEmpty(server.db[j].expires,callback);
}
}
if (server.cluster_enabled) {
if (async) {
slotToKeyFlushAsync();
} else {
slotToKeyFlush();
}
}
return removed;
}
void flushdbCommand(client *c) {
server.dirty += dictSize(c->db->dict);
signalFlushedDb(c->db->id);
dictEmpty(c->db->dict,NULL);
dictEmpty(c->db->expires,NULL);
if (server.cluster_enabled) slotToKeyFlush();
addReply(c,shared.ok);
}
long long emptyDb(void(callback)(void*)) {
int j;
long long removed = 0;
for (j = 0; j < server.dbnum; j++) {
removed += dictSize(server.db[j].dict);
dictEmpty(server.db[j].dict,callback);
dictEmpty(server.db[j].expires,callback);
}
if (server.cluster_enabled) slotToKeyFlush();
return removed;
}
