Deploy H2O Wave application to Heroku?

Question

I am relatively new to deploying python web applications but I was trying to deploy my H2O wave app to Heroku but kept running into issues and I couldn't find much help in the documentation.

Everything works fine locally if I start the server using the command (in the SDK for wave):

$ ./waved
2021/01/22 10:26:38 # 
2021/01/22 10:26:38 # ┌─────────────────────────┐
2021/01/22 10:26:38 # │  ┌    ┌ ┌──┐ ┌  ┌ ┌──┐  │ H2O Wave
2021/01/22 10:26:38 # │  │ ┌──┘ │──│ │  │ └┐    │ 0.11.0 20210118061246
2021/01/22 10:26:38 # │  └─┘    ┘  ┘ └──┘  └─┘  │ ? 2020 H2O.ai, Inc.
2021/01/22 10:26:38 # └─────────────────────────┘
2021/01/22 10:26:38 # 
2021/01/22 10:26:38 # {"address":":10101","t":"listen","webroot":"/Users/kenjohnson/Documents/TTT/H2O Wave/wave/www"}
2021/01/22 10:26:39 # {"addr":"127.0.0.1:64065","route":"/tennis-pred","t":"ui_add"}
2021/01/22 10:46:04 # {"host":"http://127.0.0.1:8000","route":"/counter","t":"app_add"}

then in the root directory of the project running:

uvicorn tennis_pred_app:main

For deployment, all I have other than my wave python file is a requirements.txt and a Procfile:

web: uvicorn tennis_pred_app:main --host 0.0.0.0 --port 10101

this is what my foo (tennis_pred_app.py) looks like (simplified):

from h2o_wave import Q, main, app, ui

@app("/tennis-pred")
async def serve(q: Q):
    show_form(q)
    await q.page.save()

The error I am currently running into is:

2021-01-22T00:28:41.000000+00:00 app[api]: Build started by user x
2021-01-22T00:31:07.040695+00:00 heroku[web.1]: State changed from crashed to starting
2021-01-22T00:31:06.879674+00:00 app[api]: Deploy 1dc65130 by user x
2021-01-22T00:31:06.879674+00:00 app[api]: Release v23 created by user x
2021-01-22T00:31:26.580199+00:00 heroku[web.1]: Starting process with command `uvicorn tennis_pred_app:main --host 0.0.0.0 --port 20819`
2021-01-22T00:31:30.299421+00:00 app[web.1]: INFO:     Uvicorn running on http://0.0.0.0:20819 (Press CTRL+C to quit)
2021-01-22T00:31:30.299892+00:00 app[web.1]: INFO:     Started parent process [4]
2021-01-22T00:31:46.000000+00:00 app[api]: Build succeeded
2021-01-22T00:32:27.041954+00:00 heroku[web.1]: Error R10 (Boot timeout) -> Web process failed to bind to $PORT within 60 seconds of launch
2021-01-22T00:32:27.093099+00:00 heroku[web.1]: Stopping process with SIGKILL
2021-01-22T00:32:27.199933+00:00 heroku[web.1]: Process exited with status 137
2021-01-22T00:32:27.242769+00:00 heroku[web.1]: State changed from starting to crashed

question from:https://stackoverflow.com/questions/65836484/deploy-h2o-wave-application-to-heroku

Answer 1

You don't get to choose your port on Heroku. Instead, Heroku assigns you a port via the PORT environment variable.

Change your Procfile from

web: uvicorn foo:main --host 0.0.0.0 --port 10101

to

web: uvicorn foo:main --host 0.0.0.0 --port $PORT