Changed crystal template, picked latest flask one

template/python3-flask/Dockerfile

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+ARG PYTHON_VERSION=3.11
+FROM --platform=${TARGETPLATFORM:-linux/amd64} ghcr.io/openfaas/of-watchdog:0.9.10 as watchdog
+FROM --platform=${TARGETPLATFORM:-linux/amd64} python:${PYTHON_VERSION}-alpine as build
+
+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 openssl-dev ${ADDITIONAL_PACKAGE}
+
+# Add non root user
+RUN addgroup -S app && adduser app -S -G app
+RUN chown app /home/app
+
+USER app
+
+ENV PATH=$PATH:/home/app/.local/bin
+
+WORKDIR /home/app/
+
+COPY --chown=app:app index.py           .
+COPY --chown=app:app requirements.txt   .
+
+USER root
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Build the function directory and install any user-specified components
+USER app
+
+RUN mkdir -p function
+RUN touch ./function/__init__.py
+WORKDIR /home/app/function/
+COPY --chown=app:app function/requirements.txt	.
+RUN pip install --no-cache-dir --user -r requirements.txt
+
+#install function code
+USER root
+
+COPY --chown=app:app function/   .
+
+
+FROM build as test
+ARG TEST_COMMAND=tox
+ARG TEST_ENABLED=true
+RUN [ "$TEST_ENABLED" = "false" ] && echo "skipping tests" || eval "$TEST_COMMAND"
+
+FROM build as ship
+WORKDIR /home/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/function/handler.py

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

template/python3-flask/function/handler_test.py

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+from .handler import handle
+
+# Test your handler here
+
+# To disable testing, you can set the build_arg `TEST_ENABLED=false` on the CLI or in your stack.yml
+# https://docs.openfaas.com/reference/yaml/#function-build-args-build-args
+
+def test_handle():
+    # assert handle("input") == "input"
+    pass

template/python3-flask/function/tox.ini

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+# If you would like to disable
+# automated testing during faas-cli build,
+
+# Replace the content of this file with
+#   [tox]
+#   skipsdist = true
+
+# You can also edit, remove, or add additional test steps
+# by editing, removing, or adding new testenv sections
+
+
+# find out more about tox: https://tox.readthedocs.io/en/latest/
+[tox]
+envlist = lint,test
+skipsdist = true
+
+[testenv:test]
+deps =
+  flask
+  pytest
+  -rrequirements.txt
+commands =
+  # run unit tests with pytest
+  # https://docs.pytest.org/en/stable/
+  # configure by adding a pytest.ini to your handler
+  pytest
+
+[testenv:lint]
+deps =
+  flake8
+commands =
+  flake8 .
+
+[flake8]
+count = true
+max-line-length = 127
+max-complexity = 10
+statistics = true
+# stop the build if there are Python syntax errors or undefined names
+select = E9,F63,F7,F82
+show-source = true

template/python3-flask/index.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 waitress import serve
+import os
+
+app = Flask(__name__)
+
+# distutils.util.strtobool() can throw an exception
+def is_true(val):
+    return len(val) > 0 and val.lower() == "true" or val == "1"
+
+@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):
+    raw_body = os.getenv("RAW_BODY", "false")
+
+    as_text = True
+
+    if is_true(raw_body):
+        as_text = False
+    
+    ret = handler.handle(request.get_data(as_text=as_text))
+    return ret
+
+if __name__ == '__main__':
+    serve(app, host='0.0.0.0', port=5000)

template/python3-flask/requirements.txt

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+flask
+waitress
+tox==3.*

template/python3-flask/template.yml

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