Adding app engine request handling samples.

appengine/requests/README.md

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+## App Engine Requests Docs Snippets
+
+These snippets demonstrate various aspects of App Engine Python request handling.
+
+<!-- auto-doc-link -->
+These samples are used on the following documentation page:
+
+> https://cloud.google.com/appengine/docs/python/requests
+
+<!-- end-auto-doc-link -->

appengine/requests/app.yaml

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+runtime: python27
+api_version: 1
+threadsafe: yes
+
+handlers:
+- url: .*  # This regex directs all routes to main.app
+  script: main.app

appengine/requests/main.py

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+# Copyright 2015 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.
+
+"""
+Sample application that demonstrates various aspects of App Engine's request
+handling.
+"""
+
+import os
+import time
+
+import webapp2
+
+
+# [START request_timer]
+class TimerHandler(webapp2.RequestHandler):
+    def get(self):
+        from google.appengine.runtime import DeadlineExceededError
+
+        try:
+            time.sleep(70)
+            self.response.write('Completed.')
+        except DeadlineExceededError:
+            self.response.clear()
+            self.response.set_status(500)
+            self.response.out.write(
+                'The request did not complete in time.')
+# [END request_timer]
+
+
+# [START environment]
+class PrintEnvironmentHandler(webapp2.RequestHandler):
+    def get(self):
+        self.response.headers['Content-Type'] = 'text/plain'
+        for key, value in os.environ.iteritems():
+            self.response.out.write(
+                "{} = {}\n".format(key, value))
+# [END environment]
+
+
+# [START request_ids]
+class RequestIdHandler(webapp2.RequestHandler):
+    def get(self):
+        self.response.headers['Content-Type'] = 'text/plain'
+        request_id = os.environ.get('REQUEST_LOG_ID')
+        self.response.write(
+            'REQUEST_LOG_ID={}'.format(request_id))
+# [END request_ids]
+
+
+app = webapp2.WSGIApplication([
+    ('/timer', TimerHandler),
+    ('/environment', PrintEnvironmentHandler),
+    ('/requestid', RequestIdHandler)
+], debug=True)

appengine/requests/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 os
+
+from google.appengine.runtime import DeadlineExceededError
+import main
+import mock
+import webtest
+
+
+def test_timer(testbed):
+    app = webtest.TestApp(main.app)
+
+    with mock.patch('main.time.sleep') as sleep_mock:
+        sleep_mock.side_effect = DeadlineExceededError()
+        app.get('/timer', status=500)
+        assert sleep_mock.called
+
+
+def test_environment(testbed):
+    app = webtest.TestApp(main.app)
+    response = app.get('/environment')
+    assert response.headers['Content-Type'] == 'text/plain'
+    assert response.body
+
+
+def test_request_id(testbed):
+    app = webtest.TestApp(main.app)
+    os.environ['REQUEST_LOG_ID'] = '1234'
+    response = app.get('/requestid')
+    assert response.headers['Content-Type'] == 'text/plain'
+    assert '1234' in response.body