Add communication package

communication/protocol.go

@@ -0,0 +1,55 @@
+package communication
+
+import (
+	"bytes"
+	"encoding/gob"
+)
+
+const (
+	SERVER_COMMAND = 1 + iota
+	CLIENT_RESPONSE
+	P2P_MESSAGE
+)
+
+const (
+	V1 = 1 + iota
+)
+
+const (
+	NICKNAME = 1
+)
+
+type communicationMessage struct {
+	Type uint8
+	Data []byte
+}
+
+func AskClientNickname() ([]byte, error) {
+	c := communicationMessage{
+		Type: SERVER_COMMAND,
+		Data: []byte{NICKNAME},
+	}
+	return c.Bytes()
+}
+
+func (c *communicationMessage) Bytes() ([]byte, error) {
+	var buf bytes.Buffer
+	encoder := gob.NewEncoder(&buf)
+	err := encoder.Encode(c)
+	if err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+func Decode(serverBytes []byte) (*communicationMessage, error) {
+	var c communicationMessage
+	buf := bytes.NewBuffer(serverBytes)
+	decoder := gob.NewDecoder(buf)
+	err := decoder.Decode(&c)
+	if err != nil {
+		return nil, err
+	}
+
+	return &c, nil
+}