Initial commit: split dlp-io library out of DataPacker

dlp_io/_errors.py

@@ -0,0 +1,22 @@
+class DlpIoError(Exception):
+    """Base exception for dlp-io failures."""
+
+
+class DlpConfigurationError(DlpIoError):
+    """The bridge configuration is invalid for the current lifecycle state."""
+
+
+class DlpHelperStartError(DlpIoError):
+    """The approved Python helper could not be started."""
+
+
+class DlpProtocolError(DlpIoError):
+    """The helper and client exchanged an invalid protocol message."""
+
+
+class DlpTransportError(DlpIoError):
+    """The authenticated pipe stream failed before a valid EOF."""
+
+
+class DlpSessionBusyError(DlpIoError):
+    """A session already owns an active file stream."""