Merge pull request #58 from ilikecake/file_flush_fix

Add flush to the file write functions

Author: FoamyGuy

adafruit_logging.py

@@ -179,6 +179,9 @@ def emit(self, record: LogRecord) -> None:
 
         raise NotImplementedError()
 
+    def flush(self) -> None:
+        """Placeholder for flush function in subclasses."""
+
 
 #  pylint: disable=too-few-public-methods
 class StreamHandler(Handler):
@@ -206,6 +209,12 @@ def emit(self, record: LogRecord) -> None:
         """
         self.stream.write(self.format(record) + self.terminator)
 
+    def flush(self) -> None:
+        """flush the stream. You might need to call this if your messages
+        are not appearing in the log file.
+        """
+        self.stream.flush()
+
 
 class FileHandler(StreamHandler):
     """File handler for working with log files off of the microcontroller (like
@@ -239,6 +248,7 @@ def emit(self, record: LogRecord) -> None:
         :param record: The record (message object) to be logged
         """
         self.stream.write(self.format(record))
+        self.stream.flush()
 
 
 class RotatingFileHandler(FileHandler):
@@ -338,6 +348,7 @@ def emit(self, record: LogRecord) -> None:
         ):
             self.doRollover()
         self.stream.write(self.format(record))
+        self.stream.flush()
 
 
 class NullHandler(Handler):