package getsvc import ( "context" "io" objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object" ) // ChunkWriter is an interface of target component // to write payload chunk. type ChunkWriter interface { WriteChunk(context.Context, []byte) error } // HeaderWriter is an interface of target component // to write object header. type HeaderWriter interface { WriteHeader(context.Context, *objectSDK.Object) error } // ObjectWriter is an interface of target component to write object. type ObjectWriter interface { HeaderWriter ChunkWriter } type SimpleObjectWriter struct { obj *objectSDK.Object pld []byte } type partWriter struct { ObjectWriter headWriter HeaderWriter chunkWriter ChunkWriter } type hasherWrapper struct { hash io.Writer } func NewSimpleObjectWriter() *SimpleObjectWriter { return &SimpleObjectWriter{ obj: objectSDK.New(), } } func (s *SimpleObjectWriter) WriteHeader(_ context.Context, obj *objectSDK.Object) error { s.obj = obj s.pld = make([]byte, 0, obj.PayloadSize()) return nil } func (s *SimpleObjectWriter) WriteChunk(_ context.Context, p []byte) error { s.pld = append(s.pld, p...) return nil } func (s *SimpleObjectWriter) Object() *objectSDK.Object { if len(s.pld) > 0 { s.obj.SetPayload(s.pld) } return s.obj } func (w *partWriter) WriteChunk(ctx context.Context, p []byte) error { return w.chunkWriter.WriteChunk(ctx, p) } func (w *partWriter) WriteHeader(ctx context.Context, o *objectSDK.Object) error { return w.headWriter.WriteHeader(ctx, o) } func (h *hasherWrapper) WriteChunk(_ context.Context, p []byte) error { _, err := h.hash.Write(p) return err }