[#276] Merge repo with frostfs-api-go

Signed-off-by: Pavel Pogodaev <p.pogodaev@yadro.com>

api/util/proto/encoding/compat.go

@@ -0,0 +1,22 @@
+package encoding
+
+import (
+	_ "google.golang.org/grpc/encoding/proto" // Ensure default codec is registered before our one.
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/protoadapt"
+)
+
+// messageV2Of converts v to a proto.Message.
+// This is needed for this library to continue working in presence of external gRPC packages,
+// such as opentelemetry gRPC exporter.
+// Copied from https://github.com/grpc/grpc-go/blob/e524655becd8d4c7ba9e8687faef456e495e341e/encoding/proto/proto.go#L59.
+func messageV2Of(v any) proto.Message {
+	switch v := v.(type) {
+	case protoadapt.MessageV1:
+		return protoadapt.MessageV2Of(v)
+	case protoadapt.MessageV2:
+		return v
+	}
+
+	return nil
+}

api/util/proto/encoding/json.go

@@ -0,0 +1,48 @@
+package encoding
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"google.golang.org/grpc/encoding"
+	"google.golang.org/protobuf/encoding/protojson"
+)
+
+// JSONCodec is easyjson codec used for code generated by protogen.
+// It is binary-level compatible with the standard protojson format, thus uses the same name.
+type JSONCodec struct{}
+
+var _ encoding.Codec = JSONCodec{}
+
+func init() {
+	encoding.RegisterCodec(JSONCodec{})
+}
+
+// Name implements the encoding.Codec interface.
+func (JSONCodec) Name() string { return "json" }
+
+// Marshal implements the encoding.Codec interface.
+func (JSONCodec) Marshal(v any) ([]byte, error) {
+	switch v := v.(type) {
+	case json.Marshaler:
+		return json.Marshal(v)
+	default:
+		if v := messageV2Of(v); v != nil {
+			return protojson.Marshal(v)
+		}
+		return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
+	}
+}
+
+// Unmarshal implements the encoding.Codec interface.
+func (JSONCodec) Unmarshal(data []byte, v any) error {
+	switch v := v.(type) {
+	case json.Unmarshaler:
+		return json.Unmarshal(data, v)
+	default:
+		if v := messageV2Of(v); v != nil {
+			return protojson.Unmarshal(data, v)
+		}
+		return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
+	}
+}

api/util/proto/encoding/proto.go

@@ -0,0 +1,57 @@
+package encoding
+
+import (
+	"fmt"
+
+	"google.golang.org/grpc/encoding"
+	"google.golang.org/protobuf/proto"
+)
+
+// ProtoCodec is easyproto codec used for code generated by protogen.
+// It is binary-level compatible with the standard proto codec, thus uses the same name.
+type ProtoCodec struct{}
+
+// ProtoMarshaler is an interface accepted by ProtoCodec.Marshal.
+type ProtoMarshaler interface {
+	MarshalProtobuf([]byte) []byte
+}
+
+// ProtoUnmarshaler is an interface accepted by ProtoCodec.Unmarshal.
+type ProtoUnmarshaler interface {
+	UnmarshalProtobuf([]byte) error
+}
+
+var _ encoding.Codec = ProtoCodec{}
+
+func init() {
+	encoding.RegisterCodec(ProtoCodec{})
+}
+
+// Name implements the encoding.Codec interface.
+func (ProtoCodec) Name() string { return "proto" }
+
+// Marshal implements the encoding.Codec interface.
+func (ProtoCodec) Marshal(v any) ([]byte, error) {
+	switch v := v.(type) {
+	case ProtoMarshaler:
+		return v.MarshalProtobuf(nil), nil
+	default:
+		if v := messageV2Of(v); v != nil {
+			return proto.Marshal(v)
+		}
+		return nil, fmt.Errorf("failed to marshal, message is %T, want proto.Message", v)
+	}
+}
+
+// Unmarshal implements the encoding.Codec interface.
+func (ProtoCodec) Unmarshal(data []byte, v any) error {
+	switch v := v.(type) {
+	case ProtoUnmarshaler:
+		return v.UnmarshalProtobuf(data)
+	default:
+		if v := messageV2Of(v); v != nil {
+			return proto.Unmarshal(data, v)
+		}
+		return fmt.Errorf("failed to unmarshal, message is %T, want proto.Message", v)
+	}
+}