[#214] object: Implement Get\Head requests for EC object

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

object/ecinfo.go

@@ -0,0 +1,69 @@
+package object
+
+import (
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
+	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
+)
+
+type ECChunk object.ECChunk
+
+func (c *ECChunk) SetID(id oid.ID) {
+	objV2 := new(refs.ObjectID)
+	id.WriteToV2(objV2)
+	c.ID = *objV2
+}
+
+// ToV2 converts ECChunk to v2 ECChunk message.
+//
+// Nil ECChunk converts to nil.
+func (c *ECChunk) ToV2() *object.ECChunk {
+	return (*object.ECChunk)(c)
+}
+
+func NewECChunkFromV2(v2 *object.ECChunk) *ECChunk {
+	return (*ECChunk)(v2)
+}
+
+type ECInfo object.ECInfo
+
+// NewECInfoFromV2 wraps v2 ECInfo message to ECInfo.
+//
+// Nil object.ECInfo converts to nil.
+func NewECInfoFromV2(v2 *object.ECInfo) *ECInfo {
+	return (*ECInfo)(v2)
+}
+
+// NewECInfo creates and initializes blank ECInfo.
+func NewECInfo() *ECInfo {
+	return NewECInfoFromV2(new(object.ECInfo))
+}
+
+// ToV2 converts ECInfo to v2 ECInfo message.
+//
+// Nil ECInfo converts to nil.
+func (s *ECInfo) ToV2() *object.ECInfo {
+	return (*object.ECInfo)(s)
+}
+
+func (s *ECInfo) Marshal() ([]byte, error) {
+	return (*object.ECInfo)(s).StableMarshal(nil), nil
+}
+
+func (s *ECInfo) Unmarshal(data []byte) error {
+	return (*object.ECInfo)(s).Unmarshal(data)
+}
+
+// MarshalJSON implements json.Marshaler.
+func (s *ECInfo) MarshalJSON() ([]byte, error) {
+	return (*object.ECInfo)(s).MarshalJSON()
+}
+
+// UnmarshalJSON implements json.Unmarshaler.
+func (s *ECInfo) UnmarshalJSON(data []byte) error {
+	return (*object.ECInfo)(s).UnmarshalJSON(data)
+}
+
+func (s *ECInfo) AddChunk(chunk ECChunk) {
+	s.Chunks = append(s.Chunks, *chunk.ToV2())
+}

object/error.go

@@ -17,3 +17,21 @@ func (s *SplitInfoError) SplitInfo() *SplitInfo {
 func NewSplitInfoError(v *SplitInfo) *SplitInfoError {
 	return &SplitInfoError{si: v}
 }
+
+type ECInfoError struct {
+	ei *ECInfo
+}
+
+const ecInfoErrorMsg = "object not found, ec info has been provided"
+
+func (e *ECInfoError) Error() string {
+	return ecInfoErrorMsg
+}
+
+func (e *ECInfoError) ECInfo() *ECInfo {
+	return e.ei
+}
+
+func NewECInfoError(v *ECInfo) *ECInfoError {
+	return &ECInfoError{ei: v}
+}

object/error_test.go

@@ -1,9 +1,12 @@
 package object_test
 
 import (
+	"crypto/rand"
 	"errors"
 	"testing"
 
+	objectV2 "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/object"
+	"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/refs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	"github.com/stretchr/testify/require"
 )
@@ -31,3 +34,43 @@ func generateSplitInfo() *object.SplitInfo {
 
 	return si
 }
+
+func TestNewECInfoError(t *testing.T) {
+	var (
+		ei = generateECInfo()
+
+		err         error = object.NewECInfoError(ei)
+		expectedErr *object.ECInfoError
+	)
+
+	require.True(t, errors.As(err, &expectedErr))
+
+	eiErr, ok := err.(*object.ECInfoError)
+	require.True(t, ok)
+	require.Equal(t, ei, eiErr.ECInfo())
+}
+
+func generateECInfo() *object.ECInfo {
+	ei := object.NewECInfo()
+	ei.Chunks = append(ei.Chunks, objectV2.ECChunk{
+		ID:    generateV2ID(),
+		Index: 0,
+		Total: 2,
+	})
+	ei.Chunks = append(ei.Chunks, objectV2.ECChunk{
+		ID:    generateV2ID(),
+		Index: 1,
+		Total: 2,
+	})
+	return ei
+}
+
+func generateV2ID() refs.ObjectID {
+	var buf [32]byte
+	_, _ = rand.Read(buf[:])
+
+	var id refs.ObjectID
+	id.SetValue(buf[:])
+
+	return id
+}