Logger: Add encoding

kivy/logger.py

@@ -144,6 +144,7 @@ class FileHandler(logging.Handler):
     filename = 'log.txt'
     fd = None
     log_dir = ''
+    encoding = 'utf-8'
 
     def purge_logs(self):
         '''Purge log is called randomly to prevent the log directory from being
@@ -219,8 +220,7 @@ def _configure(self, *largs, **kwargs):
         FileHandler.filename = filename
         if FileHandler.fd is not None:
             FileHandler.fd.close()
-        FileHandler.fd = open(filename, 'w')
-
+        FileHandler.fd = open(filename, 'w', encoding=FileHandler.encoding)
         Logger.info('Logger: Record log in %s' % filename)
 
     def _write_message(self, record):

kivy/tests/test_issues/test_issue_6909.py

@@ -0,0 +1,28 @@
+import locale
+import unittest
+from unittest import mock
+from kivy import Config
+from kivy.logger import Logger, FileHandler
+import pytest
+
+
+class CodecLoggingTestCase(unittest.TestCase):
+    def test_log_handles_cp949(self):
+        with mock.patch("locale.getpreferredencoding", return_value="cp949"):
+            FileHandler.fd = None
+            FileHandler.encoding = "utf-8"
+            Config.set("kivy", "log_enable", 1)
+            Config.set("kivy", "log_level", "trace")
+            for string in ["한국어", "Niñas and niños"]:
+                Logger.trace("Lang: call_fn => value=%r" % (string,))
+
+    def test_non_utf8_encoding_raises_exception(
+        self,
+    ):  # the old error before utf-8 was standard
+        FileHandler.fd = None
+        FileHandler.encoding = "cp949"
+        Config.set("kivy", "log_enable", 1)
+        Config.set("kivy", "log_level", "trace")
+
+        with pytest.raises(UnicodeError):
+            Logger.trace("Lang: call_fn => value=%r" % ("Niñas and niños",))