Add try-except example to error reporting (GoogleCloudPlatform#1659)

* Update main.py

* Add Stackdriver error reporting instructions

Change-Id: I8fe091456bad352936d43a7174059c7b3a35721f

* Include error reporting in requirements.txt

Change-Id: I3bace7962c92440d6ac3ac0169ef5ad52e06072b

* Fix typo

Change-Id: I42113c49d165d0b04b2ff401b236b3347913c8c8

Author: Ace Nassri

functions/helloworld/main.py

@@ -149,6 +149,17 @@ def hello_method(request):
 
 def hello_error_1(request):
     # [START functions_helloworld_error]
+    # This WILL be reported to Stackdriver Error
+    # Reporting, and WILL NOT show up in logs or
+    # terminate the function.
+    from google.cloud import error_reporting
+    client = error_reporting.Client()
+
+    try:
+        raise RuntimeError('I failed you')
+    except RuntimeError:
+        client.report_exception()
+
     # This WILL be reported to Stackdriver Error Reporting,
     # and WILL terminate the function
     raise RuntimeError('I failed you')

functions/helloworld/requirements.txt

@@ -0,0 +1 @@
+google-cloud-error-reporting==0.30.0