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repl.go
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repl.go
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package sync
import (
"bytes"
"encoding/gob"
"errors"
"github.com/golang/protobuf/proto"
"io"
"github.com/flipkart-incubator/dkv/internal/storage"
"github.com/flipkart-incubator/dkv/internal/sync/raftpb"
"github.com/flipkart-incubator/dkv/pkg/serverpb"
"github.com/flipkart-incubator/nexus/pkg/db"
)
type dkvReplStore struct {
kvs storage.KVStore
}
// NewDKVReplStore creates a wrapper out of the given KVStore
// that performs synchronous replication of all operations
// over Nexus onto multiple replicas.
func NewDKVReplStore(kvs storage.KVStore) db.Store {
return &dkvReplStore{kvs}
}
func (dr *dkvReplStore) Save(_ db.RaftEntry, req []byte) (res []byte, err error) {
intReq := new(raftpb.InternalRaftRequest)
if err = proto.Unmarshal(req, intReq); err != nil {
return nil, err
}
switch {
case intReq.Put != nil:
res, err = dr.put(intReq.Put)
case intReq.MultiPut != nil:
res, err = dr.multiPut(intReq.MultiPut)
case intReq.Delete != nil:
res, err = dr.delete(intReq.Delete)
case intReq.Cas != nil:
res, err = dr.cas(intReq.Cas)
default:
err = errors.New("Unknown Save request in dkv")
}
return
}
func (dr *dkvReplStore) Load(req []byte) ([]byte, error) {
intReq := new(raftpb.InternalRaftRequest)
if err := proto.Unmarshal(req, intReq); err != nil {
return nil, err
}
switch {
case intReq.Get != nil:
return dr.get(intReq.Get)
case intReq.MultiGet != nil:
return dr.multiGet(intReq.MultiGet)
default:
return nil, errors.New("Unknown Load request in dkv")
}
}
func (dr *dkvReplStore) put(putReq *serverpb.PutRequest) ([]byte, error) {
err := dr.kvs.Put(&serverpb.KVPair{Key: putReq.Key, Value: putReq.Value, ExpireTS: putReq.ExpireTS})
return nil, err
}
func (dr *dkvReplStore) multiPut(multiPutReq *serverpb.MultiPutRequest) ([]byte, error) {
puts := make([]*serverpb.KVPair, len(multiPutReq.PutRequest))
for i, request := range multiPutReq.PutRequest {
puts[i] = &serverpb.KVPair{Key: request.Key, Value: request.Value, ExpireTS: request.ExpireTS}
}
err := dr.kvs.Put(puts...)
return nil, err
}
func (dr *dkvReplStore) cas(casReq *serverpb.CompareAndSetRequest) ([]byte, error) {
res, err := dr.kvs.CompareAndSet(casReq)
succ, fail := []byte{0}, []byte{1}
if res && err == nil {
return succ, nil
}
return fail, err
}
func (dr *dkvReplStore) delete(delReq *serverpb.DeleteRequest) ([]byte, error) {
err := dr.kvs.Delete(delReq.Key)
return nil, err
}
func (dr *dkvReplStore) get(getReq *serverpb.GetRequest) ([]byte, error) {
vals, err := dr.kvs.Get(getReq.Key)
if err != nil {
return nil, err
}
return gobEncode(vals)
}
func (dr *dkvReplStore) multiGet(multiGetReq *serverpb.MultiGetRequest) ([]byte, error) {
vals, err := dr.kvs.Get(multiGetReq.Keys...)
if err != nil {
return nil, err
}
return gobEncode(vals)
}
func gobEncode(data interface{}) ([]byte, error) {
var buf bytes.Buffer
if err := gob.NewEncoder(&buf).Encode(data); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (dr *dkvReplStore) Close() error {
return dr.kvs.Close()
}
// TODO: implement this correctly
func (dr *dkvReplStore) GetLastAppliedEntry() (db.RaftEntry, error) {
return db.RaftEntry{}, errors.New("not implemented")
}
func (dr *dkvReplStore) Backup(_ db.SnapshotState) (io.ReadCloser, error) {
return dr.kvs.GetSnapshot()
}
func (dr *dkvReplStore) Restore(data io.ReadCloser) error {
return dr.kvs.PutSnapshot(data)
}