Added exception logging with stack trace (#93)

- Added logException method to capture exceptions, including their
`stack` traces and optional messages.
- Exceptions are logged to both console and file using existing
`logToStdOut` and `logToFile` methods.

src/polyphy/utils/logger.py

@@ -6,6 +6,8 @@
 from datetime import datetime
 import logging
 import time
+import traceback
+from logging.handlers import RotatingFileHandler
 
 
 class Logger:
@@ -45,6 +47,7 @@ def logToStdOut(level, *msg) -> None:
     # FILE:
     file_logger = logging.getLogger("file")
     file_handler = logging.FileHandler("polyphy.log")
+    file_handler = RotatingFileHandler("polyphy.log", maxBytes=1024*1024, backupCount=3)
     file_formatter = logging.Formatter("%(asctime)s - %(levelname)s - %(message)s")
     file_handler.setFormatter(file_formatter)
     file_logger.addHandler(file_handler)
@@ -61,3 +64,13 @@ def logToFile(level, *msg) -> None:
         Logger.file_logger.setLevel(Logger.log_level.get(level, logging.INFO))
         res = " ".join(map(str, msg))
         Logger.file_log_functions.get(level, Logger.file_logger.info)(res)
+
+    @staticmethod
+    def logException(level, exception, *msg) -> None:
+        log_msg = " ".join(map(str, msg))
+        log_msg += f"\nException: {repr(exception)}"
+        log_msg += f"\nStack Trace: {traceback.format_exc()}"
+        # Log to console
+        Logger.logToStdOut(level, log_msg)
+        # Log to file
+        Logger.logToFile(level, log_msg)