Bokeh Server Embed in Flask Application "Port in Use" OSError

lemgog · May 8, 2021, 7:13pm

Update

I was able to get this error to go away by following the instructions for running Bokeh with Flask on gunicorn. This handles multi-threaded situations and creates multiple ports, which is how Flask defaults to now even without gunicorn. I am not using gunicorn.

github.com

bokeh/bokeh/blob/branch-2.4/examples/howto/server_embed/flask_gunicorn_embed.py

try:
    import asyncio
except ImportError:
    raise RuntimeError("This example requries Python3 / asyncio")

from threading import Thread

from flask import Flask, render_template
from tornado.httpserver import HTTPServer
from tornado.ioloop import IOLoop

from bokeh.application import Application
from bokeh.application.handlers import FunctionHandler
from bokeh.embed import server_document
from bokeh.layouts import column
from bokeh.models import ColumnDataSource, Slider
from bokeh.plotting import figure
from bokeh.sampledata.sea_surface_temperature import sea_surface_temperature
from bokeh.server.server import BaseServer
from bokeh.server.tornado import BokehTornado

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However, my plots still are not showing up on the webpage even though this error is now gone. I am passing the port from my init.py to my routes.py through an os environment variable, which I’m not sure is the correct way to implement this. I’ll keep troubleshooting but I’d appreciate anyone’s thoughts on how to best handle this.