Merge pull request #1258 from rqlite/unified-stale-read-check

Add stale-read check to Store.Request()

store/store.go

@@ -965,6 +965,10 @@ func (s *Store) Request(eqr *command.ExecuteQueryRequest) ([]*command.ExecuteQue
 	}
 
 	if !s.RequiresLeader(eqr) {
+		if eqr.Level == command.ExecuteQueryRequest_QUERY_REQUEST_LEVEL_NONE && eqr.Freshness > 0 &&
+			time.Since(s.raft.LastContact()).Nanoseconds() > eqr.Freshness {
+			return nil, ErrStaleRead
+		}
 		if eqr.Request.Transaction {
 			// Transaction requested during query, but not going through consensus. This means
 			// we need to block any database serialization during the query.