initial import

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

msgpack.go

@@ -0,0 +1,105 @@
+// Package json provides a json codec
+package msgpack // import "go.unistack.org/micro-codec-msgpack/v3"
+
+import (
+	"io"
+
+	"github.com/vmihailenco/msgpack/v5"
+	"go.unistack.org/micro/v3/codec"
+	rutil "go.unistack.org/micro/v3/util/reflect"
+)
+
+type msgpackCodec struct {
+	opts codec.Options
+}
+
+const (
+	flattenTag = "flatten"
+)
+
+func (c *msgpackCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
+		return nil, nil
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
+		return m.Data, nil
+	}
+
+	return msgpack.Marshal(v)
+}
+
+func (c *msgpackCodec) Unmarshal(b []byte, v interface{}, opts ...codec.Option) error {
+	if len(b) == 0 || v == nil {
+		return nil
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, err := rutil.StructFieldByTag(v, options.TagName, flattenTag); err == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
+		m.Data = b
+		return nil
+	}
+
+	return msgpack.Unmarshal(b, v)
+}
+
+func (c *msgpackCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (c *msgpackCodec) ReadBody(conn io.Reader, v interface{}) error {
+	if v == nil {
+		return nil
+	}
+
+	buf, err := io.ReadAll(conn)
+	if err != nil {
+		return err
+	} else if len(buf) == 0 {
+		return nil
+	}
+
+	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
+	return c.Unmarshal(buf, v)
+}
+
+func (c *msgpackCodec) Write(conn io.Writer, m *codec.Message, v interface{}) error {
+	if v == nil {
+		return nil
+	}
+
+	buf, err := c.Marshal(v)
+	if err != nil {
+		return err
+	}
+	_, err = conn.Write(buf)
+	return err
+}
+
+func (c *msgpackCodec) String() string {
+	return "msgpack"
+}
+
+func NewCodec(opts ...codec.Option) codec.Codec {
+	return &msgpackCodec{opts: codec.NewOptions(opts...)}
+}