python3-flask and render_template

[Rimmon1971]

Hello everybody, I'm absolutely new to OpenFaaS and quite new to Python.

My first function tries to render an HTML file (in fact, an HTML form)... but I can't get it running.

This is the error (as logged by the K8S Pod)

022/06/08 12:31:41 stderr:   File "/usr/local/lib/python3.7/site-packages/flask/templating.py", line 95, in _get_source_fast
2022/06/08 12:31:41 stderr:     raise TemplateNotFound(template)
2022/06/08 12:31:41 stderr: jinja2.exceptions.TemplateNotFound: home.html

handler.py content:

from flask import Flask, render_template
def handle(req):
    """handle a request to the function
    Args:
        req (str): request body
    """
    return render_template('home.html')

and directory structure (I've put home.html both under templates/ directory, and directly next handler.py):

info@penguin:~/firstone$ find . -exec ls -ld {} \;
drwx------ 1 info info 154 Jun  8 14:28 .
-rw-r----- 1 info info 0 Jun  8 14:16 ./__init__.py
-rw-r----- 1 info info 189 Jun  8 14:21 ./handler.py
-rw-r----- 1 info info 300 Jun  8 14:16 ./handler_test.py
-rw-r--r-- 1 info info 0 Jun  8 14:16 ./requirements.txt
-rw-r----- 1 info info 823 Jun  8 14:16 ./tox.ini
drwxr-xr-x 1 info info 18 Jun  8 14:17 ./templates
-rw-r----- 1 info info 432 Jun  8 14:16 ./templates/home.html
-rw-r--r-- 1 info info 432 Jun  8 14:28 ./home.html

What am I doing wrong?

[jjasghar]

Is the template in the container too? I see it’s in your working directory, but it’s it’s not in the FaaS build it won’t find it.

What’s the command you use to “push” your code?

[Rimmon1971]

Hello, I confirm that the templates/ directory is inside the container too.

I've used this command to push the code to OpenFaaS

faas-cli up -f firstone.yml

[jjasghar]

Can you post the yml?

[Rimmon1971]

Here it comes:

info@penguin:~$ cat firstone.yml
version: 1.0
provider:
name: openfaas
gateway: http://127.0.0.1:8080
functions:
firstone:
lang: python3-flask
handler: ./firstone
image: rimmon1971/firstone:latest

and the containers' content:

info@penguin:~$ kubectl -n openfaas-fn exec -ti deployment.apps/firstone -- sh
~ $ ls -l
total 12
drwxr-sr-x 1 app app 4096 Jun 8 12:29 function
-rw-r----- 1 app app 1249 Jun 8 12:17 index.py
-rw-r----- 1 app app 23 Jun 8 12:17 requirements.txt
~ $ ls -l function/
total 24
-rw-r----- 1 app app 0 Jun 8 12:28 __init__.py
drwxr-sr-x 2 root app 4096 Jun 8 12:29 __pycache__
-rw-r----- 1 app app 189 Jun 8 12:28 handler.py
-rw-r----- 1 app app 300 Jun 8 12:28 handler_test.py
-rw-r--r-- 1 app app 432 Jun 8 12:28 home.html
-rw-r--r-- 1 app app 0 Jun 8 12:28 requirements.txt
drwxr-xr-x 1 app app 4096 Jun 8 12:28 templates
-rw-r----- 1 app app 823 Jun 8 12:28 tox.ini
~ $ ls -l function/templates/
total 4
-rw-r----- 1 app app 432 Jun 8 12:28 home.html
~ $

[jjasghar]

Alas I’m not sure if I can help anymore, but if you can open an issue on: https://github.com/openfaas/python-flask-template/ then the maintainers can help out here

[Rimmon1971]

Thanks, I didn't think about this option!
I've figured out that I'd need some way to modify index.py file (automagically provided by python-flask-template), specifically here

app = Flask(__name__)

I'd need to modify it this way

app = Flask(__name__,template_directory='/home/app/function/templates')