Add discrete exception type for gNMI errors

src/ucentral-client/platform/larch-sonic/utils.cpp

@@ -197,7 +197,7 @@ std::string gnmi_get(const std::string &yang_path)
 
 	if (!status.ok())
 	{
-		throw std::runtime_error{
+		throw gnmi_exception{
 		    "gNMI get operation wasn't successful: "
 		    + status.error_message() + "; error code "
 		    + std::to_string(status.error_code())};
@@ -205,25 +205,25 @@ std::string gnmi_get(const std::string &yang_path)
 
 	if (gres.notification_size() != 1)
 	{
-		throw std::runtime_error{"Unsupported notification size"};
+		throw gnmi_exception{"Unsupported notification size"};
 	}
 
 	gnmi::Notification notification = gres.notification(0);
 	if (notification.update_size() != 1)
 	{
-		throw std::runtime_error{"Unsupported update size"};
+		throw gnmi_exception{"Unsupported update size"};
 	}
 
 	gnmi::Update update = notification.update(0);
 	if (!update.has_val())
 	{
-		throw std::runtime_error{"Empty value"};
+		throw gnmi_exception{"Empty value"};
 	}
 
 	gnmi::TypedValue value = update.val();
 	if (!value.has_json_ietf_val())
 	{
-		throw std::runtime_error{"Empty JSON value"};
+		throw gnmi_exception{"Empty JSON value"};
 	}
 
 	return value.json_ietf_val();
@@ -259,10 +259,10 @@ void gnmi_operation::execute()
 
 	if (!status.ok())
 	{
-		throw std::runtime_error{
+		throw gnmi_exception{
 		    "gNMI set operation wasn't successful: "
-			+ status.error_message() + "; error code "
-			+ std::to_string(status.error_code())};
+		    + status.error_message() + "; error code "
+		    + std::to_string(status.error_code())};
 	}
 }
 

src/ucentral-client/platform/larch-sonic/utils.hpp

@@ -5,6 +5,7 @@
 
 #include <gnmi.pb.h>
 
+#include <stdexcept>
 #include <string>
 #include <vector>
 
@@ -15,6 +16,10 @@ split_string(std::string str, const std::string &delimiter);
 
 void convert_yang_path_to_proto(std::string yang_path, gnmi::Path *proto_path);
 
+class gnmi_exception : public std::runtime_error {
+	using std::runtime_error::runtime_error;
+};
+
 /**
  * @brief Get value by specified path.
  *