func restore(fsm raft.FSM, fss raft.SnapshotStore, numLogs uint64) error {
snapshots, err := fss.List()
if err != nil {
return fmt.Errorf("fss.List(): %v", err)
}
// snapshots[0] is the most recent snapshot
snapshotId := snapshots[0].ID
_, readcloser, err := fss.Open(snapshotId)
if err != nil {
return fmt.Errorf("fss.Open(%s): %v", snapshotId, err)
}
if err := fsm.Restore(readcloser); err != nil {
return fmt.Errorf("fsm.Restore(): %v", err)
}
first, _ := fsm.(*FSM).ircstore.FirstIndex()
last, _ := fsm.(*FSM).ircstore.LastIndex()
if last-first >= numLogs {
return fmt.Errorf("Compaction did not decrease log size. got: %d, want: < %d", last-first, numLogs)
}
return nil
}
