Feat: done tcp

tcp/utils.go

@@ -0,0 +1,44 @@
+package tcp
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+)
+
+const (
+	LengthPrefixSize = 4
+)
+
+func readFrame(conn net.Conn) ([]byte, error) {
+	lengthBytes := make([]byte, LengthPrefixSize)
+	_, err := io.ReadFull(conn, lengthBytes)
+	if err != nil {
+		return []byte{}, err
+	}
+
+	messageLength := binary.BigEndian.Uint32(lengthBytes)
+
+	payload := make([]byte, messageLength)
+	_, err = io.ReadFull(conn, payload)
+	if err != nil {
+		return []byte{}, err
+	}
+
+	return payload, nil
+}
+
+func sendFrame(conn net.Conn, data []byte) error {
+	messageLength := uint32(len(data))
+
+	lengthBytes := make([]byte, LengthPrefixSize)
+	binary.BigEndian.PutUint32(lengthBytes, messageLength)
+
+	_, err := conn.Write(lengthBytes)
+	if err != nil {
+		return err
+	}
+
+	_, err = conn.Write(data)
+	return err
+}