Add exception to interface

src/spider/CMakeLists.txt

@@ -42,6 +42,7 @@ set(SPIDER_CLIENT_SHARED_HEADERS
     client/Driver.hpp
     client/Context.hpp
     client/TaskGraph.hpp
+    client/Exception.hpp
     CACHE INTERNAL
     "spider client shared header files"
 )

src/spider/client/Exception.hpp

@@ -0,0 +1,19 @@
+#ifndef SPIDER_CLIENT_EXCEPTION_HPP
+#define SPIDER_CLIENT_EXCEPTION_HPP
+
+#include <cstdint>
+#include <exception>
+
+namespace spider {
+
+enum class ExceptionCode: std::uint8_t {
+    ConnectionError,
+
+};
+
+struct SpiderException: std::exception {
+    ExceptionCode code;
+};
+
+}
+#endif // SPIDER_CLIENT_EXCEPTION_HPP