91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
package etcdserver
|
|
|
|
import (
|
|
"log"
|
|
|
|
pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
|
|
"github.com/coreos/etcd/migrate"
|
|
"github.com/coreos/etcd/pkg/pbutil"
|
|
"github.com/coreos/etcd/pkg/types"
|
|
"github.com/coreos/etcd/raft/raftpb"
|
|
"github.com/coreos/etcd/snap"
|
|
"github.com/coreos/etcd/wal"
|
|
"github.com/coreos/etcd/wal/walpb"
|
|
)
|
|
|
|
type Storage interface {
|
|
// Save function saves ents and state to the underlying stable storage.
|
|
// Save MUST block until st and ents are on stable storage.
|
|
Save(st raftpb.HardState, ents []raftpb.Entry) error
|
|
// SaveSnap function saves snapshot to the underlying stable storage.
|
|
SaveSnap(snap raftpb.Snapshot) error
|
|
|
|
// TODO: WAL should be able to control cut itself. After implement self-controlled cut,
|
|
// remove it in this interface.
|
|
// Cut cuts out a new wal file for saving new state and entries.
|
|
Cut() error
|
|
// Close closes the Storage and performs finalization.
|
|
Close() error
|
|
}
|
|
|
|
type storage struct {
|
|
*wal.WAL
|
|
*snap.Snapshotter
|
|
}
|
|
|
|
func NewStorage(w *wal.WAL, s *snap.Snapshotter) Storage {
|
|
return &storage{w, s}
|
|
}
|
|
|
|
// SaveSnap saves the snapshot to disk and release the locked
|
|
// wal files since they will not be used.
|
|
func (st *storage) SaveSnap(snap raftpb.Snapshot) error {
|
|
err := st.Snapshotter.SaveSnap(snap)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
walsnap := walpb.Snapshot{
|
|
Index: snap.Metadata.Index,
|
|
Term: snap.Metadata.Term,
|
|
}
|
|
err = st.WAL.SaveSnapshot(walsnap)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
err = st.WAL.ReleaseLockTo(snap.Metadata.Index)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func readWAL(waldir string, snap walpb.Snapshot) (w *wal.WAL, id, cid types.ID, st raftpb.HardState, ents []raftpb.Entry) {
|
|
var err error
|
|
if w, err = wal.Open(waldir, snap); err != nil {
|
|
log.Fatalf("etcdserver: open wal error: %v", err)
|
|
}
|
|
var wmetadata []byte
|
|
if wmetadata, st, ents, err = w.ReadAll(); err != nil {
|
|
log.Fatalf("etcdserver: read wal error: %v", err)
|
|
}
|
|
var metadata pb.Metadata
|
|
pbutil.MustUnmarshal(&metadata, wmetadata)
|
|
id = types.ID(metadata.NodeID)
|
|
cid = types.ID(metadata.ClusterID)
|
|
return
|
|
}
|
|
|
|
// upgradeWAL converts an older version of the etcdServer data to the newest version.
|
|
// It must ensure that, after upgrading, the most recent version is present.
|
|
func upgradeWAL(cfg *ServerConfig, ver wal.WalVersion) error {
|
|
if ver == wal.WALv0_4 {
|
|
log.Print("etcdserver: converting v0.4 log to v2.0")
|
|
err := migrate.Migrate4To2(cfg.DataDir, cfg.Name)
|
|
if err != nil {
|
|
log.Fatalf("etcdserver: failed migrating data-dir: %v", err)
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|