Add Modules Example

appengine/modules/README.md

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+## App Engine Modules Docs Snippets
+
+This sample application demonstrates how to use Google App Engine's modules API.
+
+

appengine/modules/app.yaml

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

appengine/modules/backend.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.
+
+"""
+Sample backend module deployed by backend.yaml and accessed in main.py
+"""
+
+import webapp2
+
+
+class BackendHandler(webapp2.RequestHandler):
+    def get(self):
+        self.response.write("hello world")
+
+
+app = webapp2.WSGIApplication([
+    ('/', BackendHandler),
+], debug=True)

appengine/modules/backend.yaml

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+runtime: python27
+api_version: 1
+threadsafe: yes
+module: my-backend
+
+handlers:
+- url: .*
+  script: backend.app

appengine/modules/main.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.
+
+"""
+Sample application that demonstrates getting information about this
+AppEngine modules and accessing other modules in the same project.
+"""
+
+import urllib2
+# [START modules_import]
+from google.appengine.api import modules
+# [END modules_import]
+import webapp2
+
+
+class GetModuleInfoHandler(webapp2.RequestHandler):
+    def get(self):
+        # [START module_info]
+        module = modules.get_current_module_name()
+        instance_id = modules.get_current_instance_id()
+        self.response.write(
+            'module_id={}&instance_id={}'.format(module, instance_id))
+        # [END module_info]
+
+
+class GetBackendHandler(webapp2.RequestHandler):
+    def get(self):
+        # [START access_another_module]
+        backend_hostname = modules.get_hostname(module='my-backend')
+        url = "http://{}/".format(backend_hostname)
+        try:
+            result = urllib2.urlopen(url).read()
+            self.response.write('Got response {}'.format(result))
+        except urllib2.URLError:
+            pass
+        # [END access_another_module]
+
+app = webapp2.WSGIApplication([
+    ('/', GetModuleInfoHandler),
+    ('/access_backend', GetBackendHandler),
+], debug=True)

appengine/modules/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 mock
+import pytest
+import webtest
+
+
+@pytest.fixture
+def app():
+    return webtest.TestApp(main.app)
+
+
+@mock.patch("main.modules")
+def test_get_module_info(modules_mock, app):
+    modules_mock.get_current_module_name.return_value = "default"
+    modules_mock.get_current_instance_id.return_value = 1
+    response = app.get('/')
+    assert response.status_int == 200
+    results = response.body.split('&')
+    assert results[0].split('=')[1] == 'default'
+    assert results[1].split('=')[1] == '1'
+
+
+@mock.patch("main.modules")
+@mock.patch("urllib2.urlopen")
+def test_get_backend(url_open_mock, modules_mock, app):
+    url_read_mock = mock.Mock(read=mock.Mock(return_value='hello world'))
+    url_open_mock.return_value = url_read_mock
+    response = app.get('/access_backend')
+
+    assert response.status_int == 200
+    assert response.body == 'Got response hello world'