Adding redis flexible sample.

Change-Id: I4a37c5e2ce724ef2b130f76a97ca999aebec0d01

Author: Jon Wayne Parrott

appengine/flexible/redis/app.yaml

@@ -0,0 +1,13 @@
+runtime: python
+vm: true
+entrypoint: gunicorn -b :$PORT main:app
+
+runtime_config:
+  python_version: 3
+
+# [START env_variables]
+env_variables:
+    REDIS_HOST: your-redis-host
+    REDIS_PORT: your-redis-port
+    REDIS_PASSWORD: your-redis-password
+# [END env_variables]

appengine/flexible/redis/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.
+
+import logging
+import os
+
+from flask import Flask
+import redis
+
+
+app = Flask(__name__)
+
+
+# [START client]
+redis_host = os.environ.get('REDIS_HOST', 'localhost')
+redis_port = int(os.environ.get('REDIS_PORT', 6379))
+redis_password = os.environ.get('REDIS_PASSWORD', None)
+redis_client = redis.StrictRedis(
+    host=redis_host, port=redis_port, password=redis_password)
+# [END client]
+
+
+# [START example]
+@app.route('/')
+def index():
+
+    # Set initial value if necessary
+    if not redis_client.get('counter'):
+        redis_client.set('counter', 0)
+
+    value = redis_client.incr('counter', 1)
+
+    return 'Value is {}'.format(value)
+# [END example]
+
+
+@app.errorhandler(500)
+def server_error(e):
+    logging.exception('An error occurred during a request.')
+    return """
+    An internal error occurred: <pre>{}</pre>
+    See logs for full stacktrace.
+    """.format(e), 500
+
+
+if __name__ == '__main__':
+    # This is used when running locally. Gunicorn is used to run the
+    # application on Google App Engine. See entrypoint in app.yaml.
+    app.run(host='127.0.0.1', port=8080, debug=True)

appengine/flexible/redis/main_test.py

@@ -0,0 +1,34 @@
+# 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.
+
+import main
+import pytest
+
+
+def test_index():
+    try:
+        main.redis_client.set('counter', 0)
+    except Exception:
+        pytest.skip('Redis is unavailable.')
+
+    main.app.testing = True
+    client = main.app.test_client()
+
+    r = client.get('/')
+    assert r.status_code == 200
+    assert '1' in r.data.decode('utf-8')
+
+    r = client.get('/')
+    assert r.status_code == 200
+    assert '2' in r.data.decode('utf-8')

appengine/flexible/redis/requirements.txt

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+Flask==0.11.1
+gunicorn==19.6.0
+redis==2.10.5