[#127] Split FrostFS ReadObject to separate methods

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

internal/frostfs/frostfs.go

@@ -11,6 +11,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/utils"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
 	"google.golang.org/grpc/codes"
@@ -76,8 +77,25 @@ func (x payloadReader) Read(p []byte) (int, error) {
 	return n, handleObjectError("read payload", err)
 }
 
-// ReadObject implements frostfs.FrostFS interface method.
-func (x *FrostFS) ReadObject(ctx context.Context, prm handler.PrmObjectRead) (*handler.ObjectPart, error) {
+// HeadObject implements frostfs.FrostFS interface method.
+func (x *FrostFS) HeadObject(ctx context.Context, prm handler.PrmObjectHead) (*object.Object, error) {
+	var prmHead pool.PrmObjectHead
+	prmHead.SetAddress(prm.Address)
+
+	if prm.BearerToken != nil {
+		prmHead.UseBearer(*prm.BearerToken)
+	}
+
+	res, err := x.pool.HeadObject(ctx, prmHead)
+	if err != nil {
+		return nil, handleObjectError("read object header via connection pool", err)
+	}
+
+	return &res, nil
+}
+
+// GetObject implements frostfs.FrostFS interface method.
+func (x *FrostFS) GetObject(ctx context.Context, prm handler.PrmObjectGet) (*handler.Object, error) {
 	var prmGet pool.PrmObjectGet
 	prmGet.SetAddress(prm.Address)
 
@@ -85,27 +103,19 @@ func (x *FrostFS) ReadObject(ctx context.Context, prm handler.PrmObjectRead) (*h
 		prmGet.UseBearer(*prm.BearerToken)
 	}
 
-	// The code below must be reworked. It was copied from frostfs-s3-gw
-	// to create similar mocks for unit and fuzzing tests.
-	//
-	// However, this code was changed due to specific of expected responses
-	// from HTTP gateway. HTTP Gateway requires two types of responses:
-	// * payload as io.Reader + HEAD request
-	// * only payload as io.Reader
-	// Therefore all unused params were deleted and code was simplified.
-
-	if prm.PayloadRange[0]+prm.PayloadRange[1] == 0 {
 	res, err := x.pool.GetObject(ctx, prmGet)
 	if err != nil {
-			return nil, handleObjectError("init full payload range reading via connection pool", err)
+		return nil, handleObjectError("init full object reading via connection pool", err)
 	}
 
-		return &handler.ObjectPart{
+	return &handler.Object{
+		Header:  res.Header,
 		Payload: res.Payload,
-			Head:    &res.Header,
 	}, nil
 }
 
+// RangeObject implements frostfs.FrostFS interface method.
+func (x *FrostFS) RangeObject(ctx context.Context, prm handler.PrmObjectRange) (io.ReadCloser, error) {
 	var prmRange pool.PrmObjectRange
 	prmRange.SetAddress(prm.Address)
 	prmRange.SetOffset(prm.PayloadRange[0])
@@ -120,9 +130,7 @@ func (x *FrostFS) ReadObject(ctx context.Context, prm handler.PrmObjectRead) (*h
 		return nil, handleObjectError("init payload range reading via connection pool", err)
 	}
 
-	return &handler.ObjectPart{
-		Payload: payloadReader{&res},
-	}, nil
+	return payloadReader{&res}, nil
 }
 
 // SearchObjects implements frostfs.FrostFS interface method.

internal/handler/download.go

@@ -153,19 +153,19 @@ func (h *Handler) DownloadZipped(c *fasthttp.RequestCtx) {
 }
 
 func (h *Handler) zipObject(ctx context.Context, zipWriter *zip.Writer, addr oid.Address, btoken *bearer.Token, bufZip []byte) error {
-	prm := PrmObjectRead{
+	prm := PrmObjectGet{
 		PrmAuth: PrmAuth{
 			BearerToken: btoken,
 		},
 		Address: addr,
 	}
 
-	resGet, err := h.frostfs.ReadObject(ctx, prm)
+	resGet, err := h.frostfs.GetObject(ctx, prm)
 	if err != nil {
 		return fmt.Errorf("get FrostFS object: %v", err)
 	}
 
-	objWriter, err := h.addObjectToZip(zipWriter, resGet.Head)
+	objWriter, err := h.addObjectToZip(zipWriter, &resGet.Header)
 	if err != nil {
 		return fmt.Errorf("zip create header: %v", err)
 	}

internal/handler/frostfs_mock.go

@@ -78,32 +78,49 @@ func (t *TestFrostFS) requestOwner(btoken *bearer.Token) user.ID {
 	return owner
 }
 
-func (t *TestFrostFS) ReadObject(_ context.Context, prm PrmObjectRead) (*ObjectPart, error) {
-	sAddr := prm.Address.EncodeToString()
+func (t *TestFrostFS) retrieveObject(addr oid.Address, btoken *bearer.Token) (*object.Object, error) {
+	sAddr := addr.EncodeToString()
 
 	if obj, ok := t.objects[sAddr]; ok {
-		owner := t.requestOwner(prm.BearerToken)
+		owner := t.requestOwner(btoken)
 
-		if !t.isAllowed(prm.Address.Container(), owner, acl.OpObjectGet, prm.Address.Object()) {
+		if !t.isAllowed(addr.Container(), owner, acl.OpObjectGet, addr.Object()) {
 			return nil, ErrAccessDenied
 		}
 
-		payload := obj.Payload()
-
-		if prm.PayloadRange[0]+prm.PayloadRange[1] > 0 {
-			off := prm.PayloadRange[0]
-			payload = payload[off : off+prm.PayloadRange[1]]
-			obj = nil // GetRange does not return header values
+		return obj, nil
 	}
 
-		return &ObjectPart{
-			Head:    obj,
-			Payload: io.NopCloser(bytes.NewReader(payload)),
+	return nil, fmt.Errorf("%w: %s", &apistatus.ObjectNotFound{}, addr)
+}
+
+func (t *TestFrostFS) HeadObject(_ context.Context, prm PrmObjectHead) (*object.Object, error) {
+	return t.retrieveObject(prm.Address, prm.BearerToken)
+}
+
+func (t *TestFrostFS) GetObject(_ context.Context, prm PrmObjectGet) (*Object, error) {
+	obj, err := t.retrieveObject(prm.Address, prm.BearerToken)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Object{
+		Header:  *obj,
+		Payload: io.NopCloser(bytes.NewReader(obj.Payload())),
 	}, nil
 }
 
-	return nil, fmt.Errorf("%w: %s", &apistatus.ObjectNotFound{}, prm.Address)
+func (t *TestFrostFS) RangeObject(_ context.Context, prm PrmObjectRange) (io.ReadCloser, error) {
+	obj, err := t.retrieveObject(prm.Address, prm.BearerToken)
+	if err != nil {
+		return nil, err
 	}
+
+	off := prm.PayloadRange[0]
+	payload := obj.Payload()[off : off+prm.PayloadRange[1]]
+	return io.NopCloser(bytes.NewReader(payload)), nil
+}
+
 func (t *TestFrostFS) CreateObject(_ context.Context, prm PrmObjectCreate) (oid.ID, error) {
 	b := make([]byte, 32)
 	if _, err := io.ReadFull(rand.Reader, b); err != nil {

internal/handler/handler.go

@@ -46,8 +46,26 @@ type PrmAuth struct {
 	BearerToken *bearer.Token
 }
 
-// PrmObjectRead groups parameters of FrostFS.ReadObject operation.
-type PrmObjectRead struct {
+// PrmObjectHead groups parameters of FrostFS.HeadObject operation.
+type PrmObjectHead struct {
+	// Authentication parameters.
+	PrmAuth
+
+	// Address to read the object header from.
+	Address oid.Address
+}
+
+// PrmObjectGet groups parameters of FrostFS.GetObject operation.
+type PrmObjectGet struct {
+	// Authentication parameters.
+	PrmAuth
+
+	// Address to read the object header from.
+	Address oid.Address
+}
+
+// PrmObjectRange groups parameters of FrostFS.RangeObject operation.
+type PrmObjectRange struct {
 	// Authentication parameters.
 	PrmAuth
 
@@ -58,10 +76,10 @@ type PrmObjectRead struct {
 	PayloadRange [2]uint64
 }
 
-// ObjectPart represents partially read FrostFS object.
-type ObjectPart struct {
-	// Object header with optional in-memory payload part.
-	Head *object.Object
+// Object represents FrostFS object.
+type Object struct {
+	// Object header (doesn't contain payload).
+	Header object.Object
 
 	// Object payload part encapsulated in io.Reader primitive.
 	// Returns ErrAccessDenied on read access violation.
@@ -115,7 +133,9 @@ var (
 // FrostFS represents virtual connection to FrostFS network.
 type FrostFS interface {
 	Container(context.Context, PrmContainer) (*container.Container, error)
-	ReadObject(context.Context, PrmObjectRead) (*ObjectPart, error)
+	HeadObject(context.Context, PrmObjectHead) (*object.Object, error)
+	GetObject(context.Context, PrmObjectGet) (*Object, error)
+	RangeObject(context.Context, PrmObjectRange) (io.ReadCloser, error)
 	CreateObject(context.Context, PrmObjectCreate) (oid.ID, error)
 	SearchObjects(context.Context, PrmObjectSearch) (ResObjectSearch, error)
 	utils.EpochInfoFetcher

internal/handler/head.go

@@ -29,22 +29,22 @@ func (h *Handler) headObject(ctx context.Context, req request, objectAddress oid
 
 	btoken := bearerToken(ctx)
 
-	prm := PrmObjectRead{
+	prm := PrmObjectHead{
 		PrmAuth: PrmAuth{
 			BearerToken: btoken,
 		},
 		Address: objectAddress,
 	}
 
-	obj, err := h.frostfs.ReadObject(ctx, prm)
+	obj, err := h.frostfs.HeadObject(ctx, prm)
 	if err != nil {
 		req.handleFrostFSErr(err, start)
 		return
 	}
 
-	req.Response.Header.Set(fasthttp.HeaderContentLength, strconv.FormatUint(obj.Head.PayloadSize(), 10))
+	req.Response.Header.Set(fasthttp.HeaderContentLength, strconv.FormatUint(obj.PayloadSize(), 10))
 	var contentType string
-	for _, attr := range obj.Head.Attributes() {
+	for _, attr := range obj.Attributes() {
 		key := attr.Key()
 		val := attr.Value()
 		if !isValidToken(key) || !isValidValue(val) {
@@ -70,11 +70,11 @@ func (h *Handler) headObject(ctx context.Context, req request, objectAddress oid
 		}
 	}
 
-	idsToResponse(&req.Response, obj.Head)
+	idsToResponse(&req.Response, obj)
 
 	if len(contentType) == 0 {
-		contentType, _, err = readContentType(obj.Head.PayloadSize(), func(sz uint64) (io.Reader, error) {
-			prmRange := PrmObjectRead{
+		contentType, _, err = readContentType(obj.PayloadSize(), func(sz uint64) (io.Reader, error) {
+			prmRange := PrmObjectRange{
 				PrmAuth: PrmAuth{
 					BearerToken: btoken,
 				},
@@ -82,11 +82,7 @@ func (h *Handler) headObject(ctx context.Context, req request, objectAddress oid
 				PayloadRange: [2]uint64{0, sz},
 			}
 
-			resObj, err := h.frostfs.ReadObject(ctx, prmRange)
-			if err != nil {
-				return nil, err
-			}
-			return resObj.Payload, nil
+			return h.frostfs.RangeObject(ctx, prmRange)
 		})
 		if err != nil && err != io.EOF {
 			req.handleFrostFSErr(err, start)

internal/handler/reader.go

@@ -55,14 +55,14 @@ func (h *Handler) receiveFile(ctx context.Context, req request, objectAddress oi
 		filename string
 	)
 
-	prm := PrmObjectRead{
+	prm := PrmObjectGet{
 		PrmAuth: PrmAuth{
 			BearerToken: bearerToken(ctx),
 		},
 		Address: objectAddress,
 	}
 
-	rObj, err := h.frostfs.ReadObject(ctx, prm)
+	rObj, err := h.frostfs.GetObject(ctx, prm)
 	if err != nil {
 		req.handleFrostFSErr(err, start)
 		return
@@ -74,11 +74,11 @@ func (h *Handler) receiveFile(ctx context.Context, req request, objectAddress oi
 		dis = "attachment"
 	}
 
-	payloadSize := rObj.Head.PayloadSize()
+	payloadSize := rObj.Header.PayloadSize()
 
 	req.Response.Header.Set(fasthttp.HeaderContentLength, strconv.FormatUint(payloadSize, 10))
 	var contentType string
-	for _, attr := range rObj.Head.Attributes() {
+	for _, attr := range rObj.Header.Attributes() {
 		key := attr.Key()
 		val := attr.Value()
 		if !isValidToken(key) || !isValidValue(val) {
@@ -107,7 +107,7 @@ func (h *Handler) receiveFile(ctx context.Context, req request, objectAddress oi
 		}
 	}
 
-	idsToResponse(&req.Response, rObj.Head)
+	idsToResponse(&req.Response, &rObj.Header)
 
 	if len(contentType) == 0 {
 		// determine the Content-Type from the payload head