initial import

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

iso8583.go

@@ -0,0 +1,108 @@
+// Package iso8583 provides a iso8583 codec
+package iso8583 // import "go.unistack.org/micro-codec-iso8583/v3"
+
+import (
+	"fmt"
+	"io"
+
+	"github.com/moov-io/iso8583"
+	"go.unistack.org/micro/v3/codec"
+)
+
+type iso8583Codec struct {
+	opts codec.Options
+}
+
+var _ codec.Codec = &iso8583Codec{}
+
+func (c *iso8583Codec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
+		return nil, nil
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
+		return m.Data, nil
+	}
+
+	return nil, nil
+}
+
+func (c *iso8583Codec) 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 m, ok := v.(*codec.Frame); ok {
+		m.Data = b
+		return nil
+	}
+
+	var spec *iso8583.MessageSpec
+	if options.Context != nil {
+		if v, ok := options.Context.Value(specKey{}).(*iso8583.MessageSpec); ok {
+			spec = v
+		}
+	}
+	if spec == nil {
+		return fmt.Errorf("missing spec option")
+	}
+
+	message := iso8583.NewMessage(spec)
+	err := message.Unpack(b)
+	if err != nil {
+		return err
+	}
+
+	return message.Unmarshal(v)
+}
+
+func (c *iso8583Codec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
+	return nil
+}
+
+func (c *iso8583Codec) 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
+	}
+
+	return c.Unmarshal(buf, v)
+}
+
+func (c *iso8583Codec) 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 *iso8583Codec) String() string {
+	return "iso8583"
+}
+
+func NewCodec(opts ...codec.Option) *iso8583Codec {
+	return &iso8583Codec{opts: codec.NewOptions(opts...)}
+}