change the traceback format to print in one line (DataDog#362)

* change the traceback format to print in one line

Author: joeyzhao2018

datadog_lambda/wrapper.py

@@ -125,8 +125,8 @@ def __new__(cls, func):
             else:
                 logger.debug("datadog_lambda_wrapper already wrapped")
                 return _NoopDecorator(func)
-        except Exception:
-            traceback.print_exc()
+        except Exception as e:
+            logger.error(format_err_with_traceback(e))
             return func
 
     def __init__(self, func):
@@ -204,8 +204,8 @@ def __init__(self, func):
             patch_all()
 
             logger.debug("datadog_lambda_wrapper initialized")
-        except Exception:
-            traceback.print_exc()
+        except Exception as e:
+            logger.error(format_err_with_traceback(e))
 
     def __call__(self, event, context, **kwargs):
         """Executes when the wrapped function gets called"""
@@ -291,8 +291,8 @@ def _before(self, event, context):
             if profiling_env_var and is_new_sandbox():
                 self.prof.start(stop_on_exit=False, profile_children=True)
             logger.debug("datadog_lambda_wrapper _before() done")
-        except Exception:
-            traceback.print_exc()
+        except Exception as e:
+            logger.error(format_err_with_traceback(e))
 
     def _after(self, event, context):
         try:
@@ -358,8 +358,14 @@ def _after(self, event, context):
                     event.get("requestContext", {}).get("requestId")
                 )
             logger.debug("datadog_lambda_wrapper _after() done")
-        except Exception:
-            traceback.print_exc()
+        except Exception as e:
+            logger.error(format_err_with_traceback(e))
+
+
+def format_err_with_traceback(e):
+    return "Error {}. Traceback: {}".format(
+        e, traceback.format_exc().replace("\n", "\r")
+    )
 
 
 datadog_lambda_wrapper = _LambdaDecorator