Adding appstats sample

appengine/appstats/app.yaml

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+runtime: python27
+api_version: 1
+threadsafe: yes
+
+builtins:
+- appstats: on
+
+handlers:
+- url: .*
+  script: main.app

appengine/appstats/appengine_config.py

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+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# The app engine runtime will call this function during instance startup.
+def webapp_add_wsgi_middleware(app):
+    from google.appengine.ext.appstats import recording
+    app = recording.appstats_wsgi_middleware(app)
+    return app

appengine/appstats/main.py

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+# Copyright 2016 Google Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Sample Google App Engine application that demonstrates using appstats.
+
+For more information about App Engine, see README.md under /appengine.
+"""
+
+# [START all]
+from google.appengine.api import memcache
+import webapp2
+
+
+class MainPage(webapp2.RequestHandler):
+    def get(self):
+        # Perform some RPCs so that appstats can capture them.
+        memcache.set('example_key', 50)
+        value = memcache.get('example_key')
+        self.response.write('Value is: {}'.format(value))
+
+app = webapp2.WSGIApplication([
+    ('/', MainPage)
+], debug=True)
+# [END all]

appengine/appstats/main_test.py

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+# Copyright 2016 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import main
+import webtest
+
+
+def test_app(testbed):
+    app = webtest.TestApp(main.app)
+    app.get('/')