From 028de3a13c79a5f007b3d591b79d886f70e41d0f Mon Sep 17 00:00:00 2001
From: Abder Benbachir <anis.benbachir@gmail.com>
Date: Wed, 13 Feb 2019 15:07:19 -0800
Subject: [PATCH] improve python-lttngust documentation

---
 2.10/lttng-docs-2.10.txt | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/2.10/lttng-docs-2.10.txt b/2.10/lttng-docs-2.10.txt
index 1e3b904..f5c33bf 100644
--- a/2.10/lttng-docs-2.10.txt
+++ b/2.10/lttng-docs-2.10.txt
@@ -5039,19 +5039,26 @@ import lttngust
 import logging
 import time
 
-
+def add_handler_if_not_exist(logger, handler_class):
+    handlers = []
+    handlers += logger.handlers
+    handlers += logger.parent.handlers if logger.parent else []
+
+    if not any([handler for handler in handlers if isinstance(handler, handler_class)]):
+        logger.addHandler(handler_class())
+        
 def example():
     logging.basicConfig()
     logger = logging.getLogger('my-logger')
-
-    while True:
-        logger.debug('debug message')
-        logger.info('info message')
-        logger.warn('warn message')
-        logger.error('error message')
-        logger.critical('critical message')
-        time.sleep(1)
-
+    # keep logging to stderr even with tracing enabled
+    add_handler_if_not_exist(logger, logging.StreamHandler)
+    
+    logger.debug('debug message')
+    logger.info('info message')
+    logger.warn('warn message')
+    logger.error('error message')
+    logger.critical('critical message')
+    time.sleep(1)
 
 if __name__ == '__main__':
     example()