// Don't call this multiple times concurrently
func (s *raftStorage) save(state raftpb.HardState, entries []raftpb.Entry) error {
wb := s.db.NewBatch()
if !raft.IsEmptyHardState(state) {
stateBytes, err := state.Marshal()
if err != nil {
return err
}
wb.Put(s.hardStateKey, stateBytes)
}
if len(entries) > 0 {
lastIndex, err := s.LastIndex()
if err != nil {
return err
}
if entries[0].Index > lastIndex+1 {
panic(fmt.Errorf("missing log entries [last: %d, append at: %d]", lastIndex, entries[0].Index))
}
// clear all old entries past the new index, if any
for ix := entries[0].Index; ix <= lastIndex; ix++ {
wb.Delete(s.getEntryKey(ix))
}
// append the new entries
for _, entry := range entries {
entryBytes, err := entry.Marshal()
if err != nil {
return err
}
wb.Put(s.getEntryKey(entry.Index), entryBytes)
}
}
err := s.db.Write(wb)
return err
}
func (w *WAL) SaveState(s *raftpb.HardState) error {
if raft.IsEmptyHardState(*s) {
return nil
}
b, err := s.Marshal()
if err != nil {
panic(err)
}
rec := &walpb.Record{Type: stateType, Data: b}
return w.encoder.encode(rec)
}
func (w *WAL) SaveState(s *raftpb.HardState) error {
if raft.IsEmptyHardState(*s) {
return nil
}
log.Printf("path=%s wal.saveState state=\"%+v\"", w.f.Name(), s)
b, err := s.Marshal()
if err != nil {
panic(err)
}
rec := &walpb.Record{Type: stateType, Data: b}
return w.encoder.encode(rec)
}
// Store stores the snapshot, hardstate and entries for a given RAFT group.
func (w *Wal) Store(gid uint32, s raftpb.Snapshot, h raftpb.HardState, es []raftpb.Entry) error {
b := w.wals.NewWriteBatch()
defer b.Destroy()
if !raft.IsEmptySnap(s) {
data, err := s.Marshal()
if err != nil {
return x.Wrapf(err, "wal.Store: While marshal snapshot")
}
b.Put(w.snapshotKey(gid), data)
}
if !raft.IsEmptyHardState(h) {
data, err := h.Marshal()
if err != nil {
return x.Wrapf(err, "wal.Store: While marshal hardstate")
}
b.Put(w.hardStateKey(gid), data)
}
var t, i uint64
for _, e := range es {
t, i = e.Term, e.Index
data, err := e.Marshal()
if err != nil {
return x.Wrapf(err, "wal.Store: While marshal entry")
}
k := w.entryKey(gid, e.Term, e.Index)
b.Put(k, data)
}
// If we get no entries, then the default value of t and i would be zero. That would
// end up deleting all the previous valid raft entry logs. This check avoids that.
if t > 0 || i > 0 {
// Delete all keys above this index.
start := w.entryKey(gid, t, i+1)
prefix := w.prefix(gid)
itr := w.wals.NewIterator()
defer itr.Close()
for itr.Seek(start); itr.ValidForPrefix(prefix); itr.Next() {
b.Delete(itr.Key().Data())
}
}
err := w.wals.WriteBatch(b)
return x.Wrapf(err, "wal.Store: While WriteBatch")
}