thrift/thriftutil: Add Clone method helper

thrift/thriftutil/clone.go

@@ -0,0 +1,46 @@
+package thriftutil
+
+import (
+	"github.com/upfluence/pkg/bytesutil"
+	"github.com/upfluence/thrift/lib/go/thrift"
+)
+
+var (
+	transportFactory = BinaryProtocolFactory
+	bufferPool       = bytesutil.NewBufferPool()
+)
+
+func Clone[T any, PT interface {
+	thrift.TStruct
+	*T
+}](in PT) (PT, error) {
+	var (
+		cpy PT = new(T)
+		buf    = bufferPool.Get()
+	)
+
+	defer bufferPool.Put(buf)
+
+	if err := in.Write(transportFactory.GetProtocol(WrapWriter(buf))); err != nil {
+		return nil, err
+	}
+
+	if err := cpy.Read(transportFactory.GetProtocol(WrapReader(buf))); err != nil {
+		return nil, err
+	}
+
+	return cpy, nil
+}
+
+func MustClone[T any, PT interface {
+	thrift.TStruct
+	*T
+}](in PT) PT {
+	res, err := Clone(in)
+
+	if err != nil {
+		panic(err)
+	}
+
+	return res
+}

thrift/thriftutil/clone_test.go

@@ -0,0 +1,34 @@
+package thriftutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/upfluence/thrift/lib/go/thrift"
+)
+
+type stringTStruct struct {
+	s string
+}
+
+func (sts *stringTStruct) String() string { return sts.s }
+
+func (sts *stringTStruct) Write(p thrift.TProtocol) error {
+	return p.WriteString(sts.s)
+}
+
+func (sts *stringTStruct) Read(p thrift.TProtocol) error {
+	var err error
+
+	sts.s, err = p.ReadString()
+
+	return err
+}
+
+func TestClone(t *testing.T) {
+	res, err := Clone(&stringTStruct{s: "foobar"})
+
+	require.NoError(t, err)
+	assert.Equal(t, &stringTStruct{"foobar"}, res)
+}