log messages < error is now output to stdout instead of stderr (#1312)

rq/logutils.py

@@ -3,6 +3,7 @@ from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 
 import logging
+import sys
 
 from rq.utils import ColorizingStreamHandler
 from rq.defaults import (DEFAULT_LOGGING_FORMAT,
@@ -15,9 +16,14 @@ def setup_loghandlers(level=None, date_format=DEFAULT_LOGGING_DATE_FORMAT,
 
     if not _has_effective_handler(logger):
         formatter = logging.Formatter(fmt=log_format, datefmt=date_format)
-        handler = ColorizingStreamHandler()
+        handler = ColorizingStreamHandler(stream=sys.stdout)
         handler.setFormatter(formatter)
+        handler.addFilter(lambda record: record.levelno < logging.ERROR)
+        error_handler = ColorizingStreamHandler(stream=sys.stderr)
+        error_handler.setFormatter(formatter)
+        error_handler.addFilter(lambda record: record.levelno >= logging.ERROR)
         logger.addHandler(handler)
+        logger.addHandler(error_handler)
 
     if level is not None:
         # The level may be a numeric value (e.g. when using the logging module constants)

rq/worker.py

@@ -974,7 +974,7 @@ class Worker(object):
     def handle_exception(self, job, *exc_info):
         """Walks the exception handler stack to delegate exception handling."""
         exc_string = Worker._get_safe_exception_string(
-            traceback.format_exception_only(*exc_info[:2]) + traceback.format_exception(*exc_info)
+            traceback.format_exception(*exc_info)
         )
         self.log.error(exc_string, exc_info=True, extra={
             'func': job.func_name,