Add Python3 / Flask template for armhf

This template was tested on Kubernetes with RPi3b+ and enables a
much faster response time for Python3 on the armhf platform.

Signed-off-by: Alex Ellis (VMware) <alexellis2@gmail.com>

Author: alexellis

template/python3-flask-armhf/Dockerfile

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+FROM armhf/python:3.6-alpine
+
+# Alternatively use ADD https:// (which will not be cached by Docker builder)
+RUN apk --no-cache add curl \
+    && echo "Pulling watchdog binary from Github." \
+    && curl -sSLf https://github.com/openfaas-incubator/of-watchdog/releases/download/0.2.4/of-watchdog-armhf > /usr/bin/fwatchdog \
+    && chmod +x /usr/bin/fwatchdog \
+    && apk del curl --no-cache
+
+RUN apk --no-cache add musl-dev gcc make openssl-dev libffi-dev
+
+WORKDIR /root/
+
+COPY requirements.txt   .
+RUN pip install -r requirements.txt
+COPY index.py           .
+
+RUN mkdir -p function
+RUN touch ./function/__init__.py
+WORKDIR /root/function/
+COPY function/requirements.txt	.
+RUN pip install -r requirements.txt
+
+WORKDIR /root/
+COPY function           function
+
+ENV fprocess="python index.py"
+
+ENV cgi_headers="true"
+ENV mode="http"
+ENV upstream_url="http://127.0.0.1:5000"
+
+
+HEALTHCHECK --interval=1s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["fwatchdog"]

template/python3-flask-armhf/function/__init__.py

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+def handle(req):
+    """handle a request to the function
+    Args:
+        req (str): request body
+    """
+
+    return req

template/python3-flask-armhf/function/handler.py

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+# Copyright (c) Alex Ellis 2017. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+from flask import Flask, request
+from function import handler
+#from gevent.wsgi import WSGIServer
+from gevent.pywsgi import WSGIServer
+
+app = Flask(__name__)
+
+@app.route("/", methods=["POST", "GET"])
+def main_route():
+    ret = handler.handle(request.get_data())
+    return ret
+
+if __name__ == '__main__':
+    #app.run(host='0.0.0.0', port=5000, debug=False)
+
+    http_server = WSGIServer(('', 5000), app)
+    http_server.serve_forever()

template/python3-flask-armhf/function/requirements.txt

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+flask
+gevent
+

template/python3-flask-armhf/index.py

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+language: python3-flask-armhf
+fprocess: python index.py