[serial-console] Fix garbled console output by decoding binary websocket frames

The serial-console extension's on_message callback assumed websocket
frames were always str. Newer versions of websocket-client (>= 1.0)
return bytes for binary frames, which the extension passed straight
into print() and got rendered as a Python bytes repr (b'...\r\n
\x1b[0;32m...'). This makes the serial console unusable on recent
Python/websocket-client combinations (reproduced on Python 3.13 with
the vendored websocket-client 1.3.1).

Decode bytes to str inside on_message so that ANSI escapes and CR/LF
are interpreted by the user's terminal as intended.

Bumps version to 1.0.0b4 and adds a HISTORY.rst entry.

Fixes #9796

Made-with: Cursor

Author: muram

src/serial-console/HISTORY.rst

@@ -1,5 +1,9 @@
 Release History
 ===============
+1.0.0b4
+++++++
+* Fixed garbled console output where binary websocket frames were printed as a Python bytes repr (``b'...\\r\\n\\x1b[...]'``) instead of decoded text. Decode bytes to str in ``on_message`` so ANSI escapes and CR/LF are interpreted by the user's terminal.
+
 1.0.0b3
 ++++++
 * Fixed an issue where admin commands were not being sent when the VM was using a custom boot diagnostics storage account.

src/serial-console/azext_serialconsole/custom.py

@@ -432,6 +432,11 @@ def on_open(_):
                 GV.websocket_instance.send(self.access_token)
 
         def on_message(_, message):
+            # Binary websocket frames arrive as bytes from websocket-client >= 1.0.
+            # Decode to str so that ANSI escapes and CR/LF are interpreted by the
+            # user's terminal instead of being printed as a bytes repr (b'...').
+            if isinstance(message, (bytes, bytearray)):
+                message = bytes(message).decode("utf-8", errors="replace")
             if GV.first_message:
                 GV.websocket_instance.send(self.access_token)
                 GV.first_message = False

src/serial-console/setup.py

@@ -16,7 +16,7 @@
 
 # TODO: Confirm this is the right version number you want and it matches your
 # HISTORY.rst entry.
-VERSION = '1.0.0b3'
+VERSION = '1.0.0b4'
 
 # The full list of classifiers is available at
 # https://pypi.python.org/pypi?%3Aaction=list_classifiers