Logs apparently not working properly

[lucassauro]

Hello!

I followed the Docs’ Python deployment tutorial to learn about Fly.

It worked and I modified the code a little bit to check how I would handle logs and environment variables.

So in addition to the original code, I just addded code to print: 1) the string passed to the route and 2) the environment variable “ENV_USER”.

import sys
from flask import Flask, render_template
import os

app = Flask(__name__)

@app.route('/')
@app.route('/<name>')
def hello(name=None):
    print("[NAME]:", name, file=sys.stdout)
    print(os.getenv("ENV_USER", "STANDARD_USER"), file=sys.stdout)
    return render_template('hello.html', name=name)

The application is deployed and running without any error but its not working.

I am successfully requesting the endpoint but the info is not being logged as you can see in these images.

It works when I’m running the server locally, btw.

Anyone know what I’m doing wrong?

Thank you so much in advance

[rngrnginf]

Having the same problem, I am trying to make it work with using “logging”

logging.basicConfig(
    format="%(levelname)s:%(message)s\n", level=logging.DEBUG, stream=sys.stdout
)

Unfortunately it won’t show up in Fly’s logs for me either.

[dusty]

It looks like Python is buffering the messages. Try adding flush=True to your print(). ie:

print("[NAME]:", name, file=sys.stdout, flush=True)