client version

backend/entities/clients.go

@@ -0,0 +1,53 @@
+package entities
+
+import "fmt"
+
+const SERVER_VERSION = 1
+
+type Client interface {
+	GetClientVersion() int
+}
+
+func NewClient(clientVersion int) (error, Client) {
+
+	isCompatible := ServerClientIsCompatibleWithClient(clientVersion)
+
+	if !isCompatible {
+		return fmt.Errorf("You client version %n is not compatible with the server verison %n", clientVersion, SERVER_VERSION), nil
+	}
+
+	client := ClientVerisonOne{
+		Version: clientVersion,
+	}
+
+	return nil, &client
+
+}
+
+func ServerClientIsCompatibleWithClient(clientVersion int) bool {
+
+	switch clientVersion {
+	case 1:
+
+		serverCompatibleVersion := []int{1}
+
+		for _, serverVersion := range serverCompatibleVersion {
+			if serverVersion == clientVersion {
+				return true
+			}
+		}
+
+		return false
+	default:
+		return false
+	}
+
+}
+
+type ClientVerisonOne struct {
+	Version int
+}
+
+func (c *ClientVerisonOne) GetClientVersion() int {
+	return c.Version
+}