Create debian templates for the python 3 flask templates.

template/python3-flask-debian/Dockerfile

@@ -0,0 +1,56 @@
+FROM openfaas/of-watchdog:0.7.2 as watchdog
+FROM python:3.7-slim-buster
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+ARG ADDITIONAL_PACKAGE
+# Alternatively use ADD https:// (which will not be cached by Docker builder)
+
+RUN apt-get -qy update && apt-get -qy install gcc make ${ADDITIONAL_PACKAGE}
+
+# Add non root user
+RUN addgroup --system app && adduser app --system --ingroup app
+RUN chown app /home/app
+
+USER app
+
+ENV PATH=$PATH:/home/app/.local/bin
+
+WORKDIR /home/app/
+
+COPY index.py           .
+COPY requirements.txt   .
+
+USER root
+RUN pip install -r requirements.txt
+
+#build function directory and install user specified componenets.
+USER app
+
+RUN mkdir -p function
+RUN touch ./function/__init__.py
+WORKDIR /home/app/function/
+COPY function/requirements.txt	.
+RUN pip install --user -r requirements.txt
+
+WORKDIR /home/app/
+
+#install function code
+USER root
+
+COPY function   function
+RUN chown -R app:app ./
+
+#configure WSGI server and healthcheck
+USER app
+
+ENV fprocess="python index.py"
+
+ENV cgi_headers="true"
+ENV mode="http"
+ENV upstream_url="http://127.0.0.1:5000"
+
+HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["fwatchdog"]

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

@@ -0,0 +1,7 @@
+def handle(req):
+    """handle a request to the function
+    Args:
+        req (str): request body
+    """
+
+    return req

template/python3-flask-debian/index.py

@@ -0,0 +1,32 @@
+# 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.before_request
+def fix_transfer_encoding():
+    """
+    Sets the "wsgi.input_terminated" environment flag, thus enabling
+    Werkzeug to pass chunked requests as streams.  The gunicorn server
+    should set this, but it's not yet been implemented.
+    """
+
+    transfer_encoding = request.headers.get("Transfer-Encoding", None)
+    if transfer_encoding == u"chunked":
+        request.environ["wsgi.input_terminated"] = True
+
+@app.route("/", defaults={"path": ""}, methods=["POST", "GET"])
+@app.route("/<path:path>", methods=["POST", "GET"])
+def main_route(path):
+    ret = handler.handle(request.get_data())
+    return ret
+
+if __name__ == '__main__':
+
+    http_server = WSGIServer(('0.0.0.0', 5000), app)
+    http_server.serve_forever()

template/python3-flask-debian/requirements.txt

@@ -0,0 +1,3 @@
+flask
+gevent
+

template/python3-flask-debian/template.yml

@@ -0,0 +1,2 @@
+language: python3-flask-debian
+fprocess: python index.py

template/python3-flask/Dockerfile

@@ -5,6 +5,8 @@ COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
 RUN chmod +x /usr/bin/fwatchdog
 
 ARG ADDITIONAL_PACKAGE
+# Alternatively use ADD https:// (which will not be cached by Docker builder)
+
 RUN apk --no-cache add musl-dev gcc make ${ADDITIONAL_PACKAGE}
 
 # Add non root user
@@ -19,8 +21,11 @@ WORKDIR /home/app/
 
 COPY index.py           .
 COPY requirements.txt   .
+
 USER root
 RUN pip install -r requirements.txt
+
+#build function directory and install user specified componenets.
 USER app
 
 RUN mkdir -p function
@@ -31,9 +36,13 @@ RUN pip install --user -r requirements.txt
 
 WORKDIR /home/app/
 
+#install function code
 USER root
+
 COPY function   function
 RUN chown -R app:app ./
+
+#configure WSGI server and healthcheck
 USER app
 
 ENV fprocess="python index.py"

template/python3-http-debian/Dockerfile

@@ -0,0 +1,49 @@
+FROM openfaas/of-watchdog:0.7.2 as watchdog
+FROM python:3.7-slim-buster
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+ARG ADDITIONAL_PACKAGE
+# Alternatively use ADD https:// (which will not be cached by Docker builder)
+
+RUN apt-get -qy update && apt-get -qy install ${ADDITIONAL_PACKAGE}
+
+# Add non root user
+RUN addgroup --system app && adduser app --system --ingroup app
+RUN chown app /home/app
+
+USER app
+
+ENV PATH=$PATH:/home/app/.local/bin
+
+WORKDIR /home/app/
+
+COPY index.py           .
+COPY requirements.txt   .
+USER root
+RUN pip install -r requirements.txt
+USER app
+
+RUN mkdir -p function
+RUN touch ./function/__init__.py
+WORKDIR /home/app/function/
+COPY function/requirements.txt	.
+RUN pip install --user -r requirements.txt
+
+WORKDIR /home/app/
+
+USER root
+COPY function   function
+RUN chown -R app:app ./
+USER app
+
+# Set up of-watchdog for HTTP mode
+ENV fprocess="python index.py"
+ENV cgi_headers="true"
+ENV mode="http"
+ENV upstream_url="http://127.0.0.1:5000"
+
+HEALTHCHECK --interval=5s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["fwatchdog"]

template/python3-http-debian/function/handler.py

@@ -0,0 +1,5 @@
+def handle(event, context):
+    return {
+        "statusCode": 200,
+        "body": "Hello from OpenFaaS!"
+    }

template/python3-http-debian/index.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+from flask import Flask, request, jsonify
+from waitress import serve
+import os
+
+from function import handler
+
+app = Flask(__name__)
+
+class Event:
+    def __init__(self):
+        self.body = request.get_data()
+        self.headers = request.headers
+        self.method = request.method
+        self.query = request.args
+        self.path = request.path
+
+class Context:
+    def __init__(self):
+        self.hostname = os.environ['HOSTNAME']
+
+def format_status_code(resp):
+    if 'statusCode' in resp:
+        return resp['statusCode']
+
+    return 200
+
+def format_body(resp):
+    if 'body' not in resp:
+        return ""
+    elif type(resp['body']) == dict:
+        return jsonify(resp['body'])
+    else:
+        return str(resp['body'])
+
+def format_headers(resp):
+    if 'headers' not in resp:
+        return []
+    elif type(resp['headers']) == dict:
+        headers = []
+        for key in resp['headers'].keys():
+            header_tuple = (key, resp['headers'][key])
+            headers.append(header_tuple)
+        return headers
+
+    return resp['headers']
+
+def format_response(resp):
+    if resp == None:
+        return ('', 200)
+
+    statusCode = format_status_code(resp)
+    body = format_body(resp)
+    headers = format_headers(resp)
+
+    return (body, statusCode, headers)
+
+@app.route('/', defaults={'path': ''}, methods=['GET', 'PUT', 'POST', 'PATCH', 'DELETE'])
+@app.route('/<path:path>', methods=['GET', 'PUT', 'POST', 'PATCH', 'DELETE'])
+def call_handler(path):
+    event = Event()
+    context = Context()
+    response_data = handler.handle(event, context)
+
+    resp = format_response(response_data)
+    return resp
+
+if __name__ == '__main__':
+    serve(app, host='0.0.0.0', port=5000)

template/python3-http-debian/requirements.txt

@@ -0,0 +1,2 @@
+flask
+waitress

template/python3-http-debian/template.yml

@@ -0,0 +1,2 @@
+language: python3-http-debian
+fprocess: python index.py

template/python3-http/Dockerfile

@@ -6,6 +6,7 @@ RUN chmod +x /usr/bin/fwatchdog
 
 ARG ADDITIONAL_PACKAGE
 # Alternatively use ADD https:// (which will not be cached by Docker builder)
+
 RUN apk --no-cache add ${ADDITIONAL_PACKAGE}
 
 # Add non root user
@@ -22,6 +23,8 @@ COPY index.py           .
 COPY requirements.txt   .
 USER root
 RUN pip install -r requirements.txt
+
+#build function directory and install user specified componenets.
 USER app
 
 RUN mkdir -p function
@@ -32,12 +35,14 @@ RUN pip install --user -r requirements.txt
 
 WORKDIR /home/app/
 
+#install function code
 USER root
 COPY function   function
 RUN chown -R app:app ./
+
+#configure WSGI server and healthcheck
 USER app
 
-# Set up of-watchdog for HTTP mode
 ENV fprocess="python index.py"
 ENV cgi_headers="true"
 ENV mode="http"