feat: better logger stream allocation (#1006)

# Motivation

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# Content

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# Testing

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# Please check the following before marking your PR as ready for review

- [ ] I have added tests for my changes
- [ ] I have updated the documentation or added new documentation as
needed

Author: caroljung-cg

src/codegen/shared/logging/get_logger.py

@@ -1,41 +1,76 @@
 import logging
+import sys
 
 import colorlog
 
-
-def get_logger(name: str, level: int = logging.INFO) -> logging.Logger:
-    # Force configure the root logger with a NullHandler to prevent duplicate logs
-    logging.basicConfig(handlers=[logging.NullHandler()], force=True)
-
-    formatter = colorlog.ColoredFormatter(
-        "%(white)s%(asctime)s - %(name)s - %(log_color)s%(levelname)s%(reset)s%(white)s - %(message_log_color)s%(message)s",
-        log_colors={
+formatter = colorlog.ColoredFormatter(
+    "%(white)s%(asctime)s - %(name)s - %(log_color)s%(levelname)s%(reset)s%(white)s - %(message_log_color)s%(message)s",
+    log_colors={
+        "DEBUG": "white",
+        "INFO": "green",
+        "WARNING": "yellow",
+        "ERROR": "red",
+        "CRITICAL": "red,bg_white",
+    },
+    secondary_log_colors={
+        "message": {
             "DEBUG": "cyan",
-            "INFO": "green",
+            "INFO": "white",
             "WARNING": "yellow",
             "ERROR": "red",
             "CRITICAL": "red,bg_white",
-        },
-        secondary_log_colors={
-            "message": {
-                "DEBUG": "cyan",
-                "INFO": "blue",
-                "WARNING": "yellow",
-                "ERROR": "red",
-                "CRITICAL": "red,bg_white",
-            }
-        },
-    )
+        }
+    },
+)
+
+
+class StdOutFilter(logging.Filter):
+    def filter(self, record):
+        return record.levelno < logging.ERROR
+
+
+class StdErrFilter(logging.Filter):
+    def filter(self, record):
+        return record.levelno >= logging.ERROR
+
+
+# Create handlers
+stdout_handler = logging.StreamHandler(sys.stdout)  # Logs to stdout
+stdout_handler.setFormatter(formatter)
+stdout_handler.addFilter(StdOutFilter())
+
+stderr_handler = logging.StreamHandler(sys.stderr)  # Logs to stderr
+stderr_handler.setFormatter(formatter)
+stderr_handler.addFilter(StdErrFilter())
+
+
+def get_logger(name: str, level: int = logging.INFO) -> logging.Logger:
+    logger = _setup_logger(name, level)
+    _setup_exception_logging(logger)
+    return logger
+
+
+def _setup_logger(name: str, level: int = logging.INFO) -> logging.Logger:
+    # Force configure the root logger with a NullHandler to prevent duplicate logs
+    logging.basicConfig(handlers=[logging.NullHandler()], force=True)
     logger = logging.getLogger(name)
     if logger.hasHandlers():
         for h in logger.handlers:
             logger.removeHandler(h)
 
-    handler = colorlog.StreamHandler()
-    handler.setFormatter(formatter)
-    logger.addHandler(handler)
+    logger.addHandler(stdout_handler)
+    logger.addHandler(stderr_handler)
+
     # Ensure the logger propagates to the root logger
     logger.propagate = True
     # Set the level on the logger itself
     logger.setLevel(level)
     return logger
+
+
+def _setup_exception_logging(logger: logging.Logger) -> None:
+    def log_exception(exc_type, exc_value, exc_traceback):
+        logger.exception("Uncaught exception", exc_info=(exc_type, exc_value, exc_traceback))
+
+    # Set the log_exception function as the exception hook
+    sys.excepthook = log_exception