WIP ITS#9823 Check minCSN when setting up delta-log replay

servers/slapd/overlays/syncprov.c

@@ -3084,7 +3084,7 @@ syncprov_op_search( Operation *op, SlapReply *rs )
 	sync_control *srs;
 	BerVarray ctxcsn;
 	int i, *sids, numcsns;
-	struct berval mincsn, maxcsn;
+	struct berval mincsn, maxcsn, *vals;
 	int minsid, maxsid;
 	int dirty = 0;
 
@@ -3340,6 +3340,41 @@ no_change:	if ( !(op->o_sync_mode & SLAP_SYNC_PERSIST) ) {
 					numcsns, sids, &mincsn, minsid ) ) {
 				do_present = SS_PRESENT;
 			}
+		} else if ( si->si_nopres && si->si_usehint && backend_attribute( op,
+					NULL, &op->o_bd->be_nsuffix[0], ad_minCSN, &vals, ACL_NONE
+					) == LDAP_SUCCESS && vals ) {
+			/* We are instructed to trust minCSN and it exists, is it contained
+			 * in our cookie? */
+			int *log_sids, log_numcsns;
+
+			log_numcsns = ldap_count_values_len( &vals );
+			log_sids = slap_parse_csn_sids( vals, log_numcsns, op->o_tmpmemctx );
+			slap_sort_csn_sids( vals, log_sids, log_numcsns, op->o_tmpmemctx );
+
+			for ( i=0, j=0; i<log_numcsns; i++ ) {
+				while ( j < numcsns && log_sids[i] > sids[j] ) j++;
+				if ( j < numcsns && log_sids[i] == sids[j] &&
+						ber_bvcmp( &vals[i], &srs->sr_state.ctxcsn[j] ) <= 0 ) {
+					/* minCSN for this serverID is contained, keep going */
+					continue;
+				}
+				/*
+				 * Log BD's minCSN claims we can only replay from a certain
+				 * CSN for this serverID, but consumer's cookie hasn't met that
+				 * threshold: they need to refresh
+				 */
+				/* ITS#9580 FIXME: when we've figured out and split the
+				 * sessionlog/deltalog tracking, check the appropriate
+				 * attribute */
+				Debug( LDAP_DEBUG_SYNC, "%s syncprov_op_search: "
+					"consumer not within recorded mincsn for DB's mincsn=%s\n",
+					op->o_log_prefix, vals[i].bv_val );
+				rs->sr_err = LDAP_SYNC_REFRESH_REQUIRED;
+				rs->sr_text = "sync cookie is stale";
+				slap_sl_free( log_sids, op->o_tmpmemctx );
+				goto bailout;
+			}
+			slap_sl_free( log_sids, op->o_tmpmemctx );
 		}
 		/*
 		 * If sessionlog wasn't useful, see if we can find at least one entry
@@ -3785,6 +3820,7 @@ sp_cf_gen(ConfigArgs *c)
 		break;
 	case SP_USEHINT:
 		si->si_usehint = c->value_int;
+		rc = syncprov_setup_accesslog();
 		break;
 	case SP_LOGDB:
 		if ( si->si_logs ) {