chore(storage): integrate Compose in new interface

storage/client.go

@@ -281,7 +281,6 @@ type composeObjectRequest struct {
 	dstObject     destinationObject
 	srcs          []sourceObject
 	predefinedACL string
-	encryptionKey []byte
 	sendCRC32C    bool
 }
 

storage/copy.go

@@ -188,6 +188,9 @@ func (c *Composer) Run(ctx context.Context) (attrs *ObjectAttrs, err error) {
 	if err := c.dst.validate(); err != nil {
 		return nil, err
 	}
+	if c.dst.gen != defaultGen {
+		return nil, fmt.Errorf("storage: generation cannot be specified on compose destination, got %v", c.dst.gen)
+	}
 	if len(c.srcs) == 0 {
 		return nil, errors.New("storage: at least one source object must be specified")
 	}
@@ -204,45 +207,36 @@ func (c *Composer) Run(ctx context.Context) (attrs *ObjectAttrs, err error) {
 		}
 	}
 
-	// TODO: transport agnostic interface starts here.
-	req := &raw.ComposeRequest{}
-	// Compose requires a non-empty Destination, so we always set it,
-	// even if the caller-provided ObjectAttrs is the zero value.
-	req.Destination = c.ObjectAttrs.toRawObject(c.dst.bucket)
-	if c.SendCRC32C {
-		req.Destination.Crc32c = encodeUint32(c.ObjectAttrs.CRC32C)
+	req := &composeObjectRequest{
+		dstBucket:     c.dst.bucket,
+		predefinedACL: c.PredefinedACL,
+		sendCRC32C:    c.SendCRC32C,
+	}
+	req.dstObject = destinationObject{
+		name:          c.dst.object,
+		bucket:        c.dst.bucket,
+		conds:         c.dst.conds,
+		attrs:         &c.ObjectAttrs,
+		encryptionKey: c.dst.encryptionKey,
 	}
 	for _, src := range c.srcs {
-		srcObj := &raw.ComposeRequestSourceObjects{
-			Name: src.object,
+		s := sourceObject{
+			name:   src.object,
+			bucket: src.bucket,
+			gen:    src.gen,
+			conds:  src.conds,
 		}
-		if err := applyConds("ComposeFrom source", src.gen, src.conds, composeSourceObj{srcObj}); err != nil {
-			return nil, err
-		}
-		req.SourceObjects = append(req.SourceObjects, srcObj)
+		req.srcs = append(req.srcs, s)
 	}
 
-	call := c.dst.c.raw.Objects.Compose(c.dst.bucket, c.dst.object, req).Context(ctx)
-	if err := applyConds("ComposeFrom destination", c.dst.gen, c.dst.conds, call); err != nil {
-		return nil, err
+	isIdempotent := c.dst.conds != nil && (c.dst.conds.GenerationMatch != 0 || c.dst.conds.DoesNotExist)
+	opts := []storageOption{idempotent(isIdempotent)}
+	if c.dst.retry != nil {
+		opts = append(opts, withRetryConfig(c.dst.retry))
 	}
 	if c.dst.userProject != "" {
-		call.UserProject(c.dst.userProject)
-	}
-	if c.PredefinedACL != "" {
-		call.DestinationPredefinedAcl(c.PredefinedACL)
+		opts = append(opts, withUserProject(c.dst.userProject))
 	}
-	if err := setEncryptionHeaders(call.Header(), c.dst.encryptionKey, false); err != nil {
-		return nil, err
-	}
-	var obj *raw.Object
-	setClientHeader(call.Header())
 
-	retryCall := func() error { obj, err = call.Do(); return err }
-	isIdempotent := c.dst.conds != nil && (c.dst.conds.GenerationMatch != 0 || c.dst.conds.DoesNotExist)
-
-	if err := run(ctx, retryCall, c.dst.retry, isIdempotent, setRetryHeaderHTTP(call)); err != nil {
-		return nil, err
-	}
-	return newObject(obj), nil
+	return c.dst.c.tc.ComposeObject(ctx, req, opts...)
 }

storage/grpc_client.go

@@ -727,7 +727,7 @@ func (c *grpcStorageClient) ComposeObject(ctx context.Context, req *composeObjec
 
 	dstObjPb := req.dstObject.attrs.toProtoObject(req.dstBucket)
 	dstObjPb.Name = req.dstObject.name
-	if err := applyCondsProto("ComposeObject destination", -1, req.dstObject.conds, dstObjPb); err != nil {
+	if err := applyCondsProto("ComposeObject destination", defaultGen, req.dstObject.conds, dstObjPb); err != nil {
 		return nil, err
 	}
 	if req.sendCRC32C {
@@ -750,8 +750,8 @@ func (c *grpcStorageClient) ComposeObject(ctx context.Context, req *composeObjec
 	if req.predefinedACL != "" {
 		rawReq.DestinationPredefinedAcl = req.predefinedACL
 	}
-	if req.encryptionKey != nil {
-		rawReq.CommonObjectRequestParams = toProtoCommonObjectRequestParams(req.encryptionKey)
+	if req.dstObject.encryptionKey != nil {
+		rawReq.CommonObjectRequestParams = toProtoCommonObjectRequestParams(req.dstObject.encryptionKey)
 	}
 
 	var obj *storagepb.Object

storage/http_client.go

@@ -692,7 +692,7 @@ func (c *httpStorageClient) ComposeObject(ctx context.Context, req *composeObjec
 	}
 
 	call := c.raw.Objects.Compose(req.dstBucket, req.dstObject.name, rawReq).Context(ctx)
-	if err := applyConds("ComposeFrom destination", -1, req.dstObject.conds, call); err != nil {
+	if err := applyConds("ComposeFrom destination", defaultGen, req.dstObject.conds, call); err != nil {
 		return nil, err
 	}
 	if s.userProject != "" {
@@ -701,7 +701,7 @@ func (c *httpStorageClient) ComposeObject(ctx context.Context, req *composeObjec
 	if req.predefinedACL != "" {
 		call.DestinationPredefinedAcl(req.predefinedACL)
 	}
-	if err := setEncryptionHeaders(call.Header(), req.encryptionKey, false); err != nil {
+	if err := setEncryptionHeaders(call.Header(), req.dstObject.encryptionKey, false); err != nil {
 		return nil, err
 	}
 	var obj *raw.Object

storage/reader.go

@@ -94,7 +94,7 @@ func (o *ObjectHandle) NewRangeReader(ctx context.Context, offset, length int64)
 	ctx = trace.StartSpan(ctx, "cloud.google.com/go/storage.Object.NewRangeReader")
 	defer func() { trace.EndSpan(ctx, err) }()
 
-	if o.c.tc != nil {
+	if o.c.useGRPC {
 		return o.newRangeReaderWithGRPC(ctx, offset, length)
 	}
 

storage/storage.go

@@ -115,6 +115,10 @@ type Client struct {
 
 	// tc is the transport-agnostic client implemented with either gRPC or HTTP.
 	tc storageClient
+	// useGRPC flags whether the client uses gRPC. This is needed while the
+	// integration piece is only partially complete.
+	// TODO: remove before merging to main.
+	useGRPC bool
 }
 
 // NewClient creates a new Google Cloud Storage client.
@@ -195,12 +199,18 @@ func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error
 		return nil, fmt.Errorf("supplied endpoint %q is not valid: %v", ep, err)
 	}
 
+	tc, err := newHTTPStorageClient(ctx, withClientOptions(opts...))
+	if err != nil {
+		return nil, fmt.Errorf("storage: %v", err)
+	}
+
 	return &Client{
 		hc:       hc,
 		raw:      rawService,
 		scheme:   u.Scheme,
 		readHost: u.Host,
 		creds:    creds,
+		tc:       tc,
 	}, nil
 }
 
@@ -215,7 +225,7 @@ func newGRPCClient(ctx context.Context, opts ...option.ClientOption) (*Client, e
 		return nil, err
 	}
 
-	return &Client{tc: tc}, nil
+	return &Client{tc: tc, useGRPC: true}, nil
 }
 
 // Close closes the Client.

storage/writer.go

@@ -236,7 +236,7 @@ func (w *Writer) Write(p []byte) (n int, err error) {
 	}
 	if !w.opened {
 		// gRPC client has been initialized - use gRPC to upload.
-		if w.o.c.tc != nil {
+		if w.o.c.useGRPC {
 			if err := w.openWriter(); err != nil {
 				return 0, err
 			}
@@ -264,7 +264,7 @@ func (w *Writer) Write(p []byte) (n int, err error) {
 // can be retrieved by calling Attrs.
 func (w *Writer) Close() error {
 	if !w.opened {
-		if w.o.c.tc != nil {
+		if w.o.c.useGRPC {
 			if err := w.openWriter(); err != nil {
 				return err
 			}