import ( "github.com/boltdb/bolt" "github.com/hashicorp/raft" ) type BoltSnapshotSink struct { db *bolt.DB } func (b *BoltSnapshotSink) Persist(sink raft.SnapshotSink) error { // Write the snapshot data to BoltDB err := b.db.Update(func(tx *bolt.Tx) error { bucket, err := tx.CreateBucketIfNotExists([]byte("snapshots")) if err != nil { return err } if err := bucket.Put([]byte("snapshot"), sink.Bytes()); err != nil { return err } return nil }) if err != nil { return err } // Notify Raft that the snapshot is complete return sink.Close() } func (b *BoltSnapshotSink) Close() error { // Close the BoltDB instance return b.db.Close() } func main() { // Initialize BoltDB db, _ := bolt.Open("mydatabase.db", 0600, nil) // Create a new BoltSnapshotSink snapSink := &BoltSnapshotSink{db} // Use the BoltSnapshotSink with Raft config := raft.DefaultConfig() store := raft.NewInmemStore() fs := raft.NewNullFS() snapshot := raft.NewSnapshot(snapData, nil) snapshotSink := raft.NewDiscardSnapshotSink() ra, err := raft.NewRaft(config, (*fsm)(nil), store, store, fs, snapshot, snapSink, snapshotSink) if err != nil { panic(err) } }
import ( "bytes" "fmt" "io/ioutil" "github.com/aws/aws-sdk-go/aws" "github.com/aws/aws-sdk-go/aws/session" "github.com/aws/aws-sdk-go/service/s3" "github.com/hashicorp/raft" ) type AWSSnapshotSink struct { bucket string key string svc *s3.S3 } func (a *AWSSnapshotSink) Persist(sink raft.SnapshotSink) error { // Write the snapshot data to S3 _, err := a.svc.PutObject(&s3.PutObjectInput{ Bucket: aws.String(a.bucket), Key: aws.String(a.key), Body: bytes.NewReader(sink.Bytes()), }) if err != nil { return err } // Notify Raft that the snapshot is complete return sink.Close() } func (a *AWSSnapshotSink) Close() error { // Nothing to do here return nil } func main() { // Initialize AWS session sess, _ := session.NewSession(&aws.Config{ Region: aws.String("us-west-2"), }) // Create a new S3 service client svc := s3.New(sess) // Create a new AWSSnapshotSink snapSink := &AWSSnapshotSink{ bucket: "my-raft-snapshots", key: "snapshot-1", svc: svc, } // Use the AWSSnapshotSink with Raft config := raft.DefaultConfig() store := raft.NewInmemStore() fs := raft.NewNullFS() snapshot := raft.NewSnapshot(snapData, nil) snapshotSink := raft.NewDiscardSnapshotSink() ra, err := raft.NewRaft(config, (*fsm)(nil), store, store, fs, snapshot, snapSink, snapshotSink) if err != nil { panic(err) } }In the above example, we have defined a struct called AWSSnapshotSink that implements the SnapshotSink interface. It uses AWS S3 to persist the snapshot data. We then create a new instance of AWSSnapshotSink and use it with Raft to persist the snapshot data.