Consider alternative Web Servers

[FabienLelaquais]

Description

Flask has a convenient built-in Web Server that is blocking. Some of our users need to potentially serve multiple, simultaneous requests therefore requesting the use of concurrent request processing from the web server.

The first candidates that come to mind are Apache (HTTP & Tomcat), Nginx or Unicorn.

We need to come up with scenarios of Web Server deployments when the Taipy GUI WSGI application can sit.

Acceptance Criteria

• [ ] We want a report on what can and cannot be expected with the current Taipy GUI architecture and its apparent dependency on Flask.

[FredLL-Avaiga]

gunicorn has already been used

[dinhlongviolin1]

We can consider closing this issue if you think it is not necessary anymore @FabienLelaquais

[FabienLelaquais]

I would love to see sections in the doc that show how to integrate a Taipy GUI app in Apache HTTP Server, IIS, Nginc or Jetty... At least a how-to.

The point of this issue is to address potential integration issues in the code if there are any.

[florian-vuillemot]

The WSGI required the following interface, which defined a callable:

def simple_app(environ, start_response):
        data = b"Hello, World!\n"
        start_response("200 OK", [
            ("Content-Type", "text/plain"),
            ("Content-Length", str(len(data)))
        ])
        return iter([data])

This interface can be implemented via a function or object defining the __call__ method. This method is called by the Web server, as shown in the following example for Gunicorn:

gunicorn -k "geventwebsocket.gunicorn.workers.GeventWebSocketWorker" -w 1 -b 0.0.0.0:8000 <filename>:<callable>

Note: The option -k "geventwebsocket.gunicorn.workers.GeventWebSocketWorker" is to provide the correct websocket support to Gunicorn and is not related to the topic.

Here is a POC of this potential implementation for Taipy:

$ cat main.py
....
class CallableGui(Gui):
    def __call__(self, *args, **kwargs):
        flask_app = self.get_flask_app()
        return flask_app(*args, **kwargs)

app = CallableGui(pages=pages)
tp.Core().run()
app.run(title="Covid Dashboard", run_server=False)

$ gunicorn -k "geventwebsocket.gunicorn.workers.GeventWebSocketWorker" -w 1 -b 0.0.0.0:8000 main.py:app

[ScalarJerk]

@FabienLelaquais to clarify the end result after the discussion here, we're looking to add a report(?) in the pull request? I didn't get that part. What is the exact deliverable we're looking for?

[KunjShah95]

Kindly assign it to me

[jrobinAV]

@KunjShah95 You are already assigned to another issue. For hacktoberfest, we only assign issues one at a time. Please submit a PR on the other issue first, or remove your assignment.

Thank you.

[kailashchoudhary11]

Hey @jrobinAV can you please assign this issue to me?

[FabienLelaquais]

@ScalarJerk To respond to your question... What Taipy GUI really does is rely on Flask to create a web app. We want to show how this can integrate other environments instead of the internal web server. Although this is great for dev, we don't want this for deployment.

Therefore, we want to:

• Describe how to configure a web server (like Tomcat or Nginx) to host a Taipy app
• Figure out what's missing from Taipy that would help the integration

[AlexandreSajus]

Assigned

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