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kv.go
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kv.go
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package kv
import (
"fmt"
"path"
"chainspace.io/chainspace-go/internal/log"
"chainspace.io/chainspace-go/internal/log/fld"
"chainspace.io/chainspace-go/service"
"github.com/dgraph-io/badger"
"github.com/gogo/protobuf/proto"
)
const (
badgerStorePath = "/kvstore/"
)
type Config struct {
RuntimeDir string
}
type Service interface {
Get(key []byte) ([]byte, error)
GetByPrefix(prefix []byte) ([]ObjectEntry, error)
Set(key, value []byte) error
}
type kvService struct {
store *badger.DB
}
type ObjectEntry struct {
Label []byte
VersionID []byte
}
func (s *kvService) handleGet(m *service.Message) (*service.Message, error) {
req := &GetRequest{}
err := proto.Unmarshal(m.Payload, req)
if err != nil {
log.Error("KV::handleGet, unable to unmarshal GetRequest", fld.Err(err))
return nil, err
}
if len(req.Key) <= 0 {
log.Error("KV::handleGet, empty key")
return nil, fmt.Errorf("empty key")
}
value, err := s.Get(req.Key)
if err != nil {
return nil, err
}
res := &GetResponse{ObjectID: value}
b, err := proto.Marshal(res)
if err != nil {
log.Error("KV::handleGet, unable to marshal response", fld.Err(err))
return nil, err
}
return &service.Message{
ID: m.ID,
Opcode: int32(Opcode_GET),
Payload: b,
}, nil
}
func (s *kvService) Get(key []byte) ([]byte, error) {
var valueout []byte
err := s.store.View(func(txn *badger.Txn) error {
item, err := txn.Get(key)
if err != nil {
return err
}
value, err := item.Value()
if err != nil {
return err
}
valueout = make([]byte, len(value))
copy(valueout, value)
return nil
})
if err != nil {
log.Error("unable to get objectID from key", fld.Err(err))
return nil, err
}
return valueout, nil
}
func (s *kvService) GetByPrefix(prefix []byte) ([]ObjectEntry, error) {
entries := []ObjectEntry{}
err := s.store.View(func(txn *badger.Txn) error {
it := txn.NewIterator(badger.DefaultIteratorOptions)
defer it.Close()
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
var entry ObjectEntry
item := it.Item()
k := item.Key()
entry.Label = make([]byte, len(k))
copy(entry.Label, k)
v, err := item.Value()
if err != nil {
return err
}
entry.VersionID = make([]byte, len(v))
copy(entry.VersionID, v)
entries = append(entries, entry)
}
return nil
})
if err != nil {
log.Error("unable to get entries from prefix", fld.Err(err))
return nil, err
}
return entries, nil
}
func (s *kvService) Handle(peerID uint64, m *service.Message) (*service.Message, error) {
switch Opcode(m.Opcode) {
case Opcode_GET:
return s.handleGet(m)
default:
log.Error("kvstore: unknown opcode",
log.Int32("OP", m.Opcode), fld.PeerID(peerID))
return nil, fmt.Errorf("kvstore: unknown opcode: %v", m.Opcode)
}
}
func (s *kvService) Set(key, value []byte) error {
return s.store.Update(func(txn *badger.Txn) error {
log.Error("adding new value for key", log.String("key", string(key)))
return txn.Set(key, value)
})
}
func New(cfg *Config) (*kvService, error) {
p := path.Join(cfg.RuntimeDir, badgerStorePath)
opts := badger.DefaultOptions
opts.Dir, opts.ValueDir = p, p
store, err := badger.Open(opts)
if err != nil {
return nil, err
}
return &kvService{
store: store,
}, nil
}