[#43] cmd/neofs-node: Implement in-memory bucket

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

cmd/neofs-node/object.go

@@ -3,16 +3,84 @@ package main
 import (
 	"context"
 	"errors"
+	"sync"
 
+	"github.com/mr-tron/base58"
 	"github.com/nspcc-dev/neofs-api-go/v2/object"
 	objectGRPC "github.com/nspcc-dev/neofs-api-go/v2/object/grpc"
 	"github.com/nspcc-dev/neofs-api-go/v2/session"
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/bucket"
 	objectTransportGRPC "github.com/nspcc-dev/neofs-node/pkg/network/transport/object/grpc"
 	objectService "github.com/nspcc-dev/neofs-node/pkg/services/object"
 )
 
 type objectExecutor struct{}
 
+type inMemBucket struct {
+	bucket.Bucket
+	*sync.RWMutex
+	items map[string][]byte
+}
+
+func newBucket() bucket.Bucket {
+	return &inMemBucket{
+		RWMutex: new(sync.RWMutex),
+		items:   map[string][]byte{},
+	}
+}
+
+func (b *inMemBucket) Get(key []byte) ([]byte, error) {
+	b.RLock()
+	v, ok := b.items[base58.Encode(key)]
+	b.RUnlock()
+
+	if !ok {
+		return nil, errors.New("not found")
+	}
+
+	return v, nil
+}
+
+func (b *inMemBucket) Set(key, value []byte) error {
+	k := base58.Encode(key)
+
+	b.Lock()
+	b.items[k] = makeCopy(value)
+	b.Unlock()
+
+	return nil
+}
+
+func (b *inMemBucket) Iterate(handler bucket.FilterHandler) error {
+	if handler == nil {
+		return bucket.ErrNilFilterHandler
+	}
+
+	b.RLock()
+	for key, val := range b.items {
+		k, err := base58.Decode(key)
+		if err != nil {
+			panic(err)
+		}
+
+		v := makeCopy(val)
+
+		if !handler(k, v) {
+			return bucket.ErrIteratingAborted
+		}
+	}
+	b.RUnlock()
+
+	return nil
+}
+
+func makeCopy(val []byte) []byte {
+	tmp := make([]byte, len(val))
+	copy(tmp, val)
+
+	return tmp
+}
+
 func (*objectExecutor) Get(context.Context, *object.GetRequestBody) (objectService.GetObjectBodyStreamer, error) {
 	return nil, errors.New("unimplemented service call")
 }