Protobuf and JSON (un-)marshalling methods for peer.ID

peer_serde.go

@@ -0,0 +1,44 @@
+// This file contains Protobuf and JSON serialization/deserialization methods for peer IDs.
+package peer
+
+import (
+	"encoding/json"
+)
+
+// Interface assertions commented out to avoid introducing hard dependencies to protobuf.
+// var _ proto.Marshaler = (*ID)(nil)
+// var _ proto.Unmarshaler = (*ID)(nil)
+var _ json.Marshaler = (*ID)(nil)
+var _ json.Unmarshaler = (*ID)(nil)
+
+func (id ID) Marshal() ([]byte, error) {
+	return []byte(id), nil
+}
+
+func (id ID) MarshalTo(data []byte) (n int, err error) {
+	return copy(data, []byte(id)), nil
+}
+
+func (id *ID) Unmarshal(data []byte) (err error) {
+	*id, err = IDFromBytes(data)
+	return err
+}
+
+// Implements Gogo's proto.Sizer, but we omit the compile-time assertion to avoid introducing a hard
+// dependency on gogo.
+func (id ID) Size() int {
+	return len([]byte(id))
+}
+
+func (id ID) MarshalJSON() ([]byte, error) {
+	return json.Marshal(IDB58Encode(id))
+}
+
+func (id *ID) UnmarshalJSON(data []byte) (err error) {
+	var v string
+	if err = json.Unmarshal(data, &v); err != nil {
+		return err
+	}
+	*id, err = IDB58Decode(v)
+	return err
+}

peer_serde_test.go

@@ -0,0 +1,45 @@
+package peer_test
+
+import (
+	"testing"
+
+	"github.com/libp2p/go-libp2p-peer"
+	"github.com/libp2p/go-libp2p-peer/test"
+)
+
+func TestPeerSerdePB(t *testing.T) {
+	id, err := testutil.RandPeerID()
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, err := id.Marshal()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	var id2 peer.ID
+	if err = id2.Unmarshal(b); err != nil {
+		t.Fatal(err)
+	}
+	if id != id2 {
+		t.Error("expected equal ids in circular serde test")
+	}
+}
+
+func TestPeerSerdeJSON(t *testing.T) {
+	id, err := testutil.RandPeerID()
+	if err != nil {
+		t.Fatal(err)
+	}
+	b, err := id.MarshalJSON()
+	if err != nil {
+		t.Fatal(err)
+	}
+	var id2 peer.ID
+	if err = id2.UnmarshalJSON(b); err != nil {
+		t.Fatal(err)
+	}
+	if id != id2 {
+		t.Error("expected equal ids in circular serde test")
+	}
+}