Python 3.7 Flask-SocketIO + uWSGI + nginx configuration - python-3.x

Question

I'm hosting two python applications (app1 and app2) on ubuntu machine (16.04) under the same setup with different python versions (2.7 and 3.7), both are based on Flask framework using Flask-SocketIO, running on uWSGI (2.0.17.1) behind Nginx proxy.
I've been able to successfully implement websocket support in version 2.7 but im failing to do the same on 3.7.
Nginx configuration and uwsgi are the same, with only exception of different plugin for uwsgi (python version)
In both cases I'm using uwsgi websocket server (via SocketIO) with redis queue.
Beside websocket problem app2 works just fine.
Python Setup
Python 2.7 Libs:
Flask==0.12.2
Flask-SocketIO==2.9.4
gevent==1.2.2
greenlet==0.4.13
Python 3.7 Libs:
Flask==1.0.2
Flask-Script==2.0.6
gevent==1.3.7
greenlet==0.4.15
uWSGI - 2.0.17.1
Working configuration of app1:
__init__.py
app = Flask(__name__)
# SocketIO
try: # This step is required only for version deployed on UWSGI
import uwsgi
socketio = SocketIO(app, message_queue=app.config['REDIS_QUEUE_URL'])
except ImportError:
print 'Application runs outside of uWSGI context'
socketio = SocketIO(app)
manage.py
from flask-script import Manager
from app1 import app
#manager.command
def runserver(host = None, port = None, socket = True):
if not host:
host = 'localhost'
if not port:
port = 5000
if socket:
socketio.run(app)
else:
app.run(host, port, debug=False)
app1.ini
[uwsgi]
plugins-dir = /usr/local/lib/uwsgi
plugins = python27
#application's base folder
base = /home/ubuntu/app1
#python module to import
app = manage
module = %(app)
home = %(base)/venv
virtualenv = %(base)/venv
pythonpath = %(base)
#socket file's location
socket = %(base)/app1.sock
#permissions for the socket file
chmod-socket = 666
callable = app
logto = /var/log/uwsgi/%n.log
processes = 20
http-websockets = true
gevent = 500
vacuum = true
die-on-term = true
enable-threads = true
master = true
app1-site
server {
listen 1014 ssl default_server;
server_name server_name_1;
access_log /var/log/nginx/app1_access_log;
error_log /var/log/nginx/app1_error_log;
auth_basic off;
# SSL only
ssl on;
ssl_certificate /etc/nginx/ssl/nginx.crt;
ssl_certificate_key /etc/nginx/ssl/nginx.key;
ssl_session_timeout 5m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
location /socket.io/ {
include uwsgi_params;
uwsgi_pass unix:/home/ubuntu/app1/app1.sock;
proxy_http_version 1.1;
proxy_read_timeout 180s;
proxy_buffering on;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
}
location / {deny all;}
location = /app1{ rewrite ^ /app1/; }
location /app1{
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://localhost:8080;
proxy_read_timeout 90;
proxy_redirect http://server:8080 https://server_name_1:1014/app1;
try_files $uri #app1; }
location #app1{
include uwsgi_params;
uwsgi_param SCRIPT_NAME /app1;
uwsgi_modifier1 30;
uwsgi_read_timeout 180s;
uwsgi_send_timeout 180s;
proxy_read_timeout 180s;
uwsgi_pass unix:/home/ubuntu/app1/app1.sock;
}}
Configuration of app2
__init__.py
def create_app():
...
app = Flask(__name__)
socket_io.init_app(app, message_queue = app.config['REDIS_URL'])
...
return app
wsgi.py
import uwsgi
from gevent.monkey import patch_all
patch_all()
print('Patching all!')
from app2 import create_app
application = create_app()
app2.ini
[uwsgi]
plugins-dir = /usr/local/lib/uwsgi
plugins = python37
#application's base folder
base = /home/ubuntu/app2
home = %(base)/venv
virtualenv = %(base)/venv
pythonpath = %(base)
mount = /app2=%(base)/wsgi.py
callable = application
socket = %(base)/app2.sock
chmod-socket = 666
chdir = %(base)
attach-daemon = %(virtualenv)/bin/celery -A celery_worker.celery worker
attach-daemon = %(virtualenv)/bin/celery -A celery_worker.celery beat
logto = /var/log/uwsgi/%n.log
processes = 20
vacuum = true
die-on-term = true
enable-threads = true
master = true
manage-script-name = true
http-websockets = true
gevent = 5000
#Workaround for flask send_file() failing on python 3 and uwsgi
wsgi-disable-file-wrapper = true
app2-site
server {
listen 1015 ssl default_server;
server_name server_name_2;
access_log /var/log/nginx/app2_access_log;
error_log /var/log/nginx/app2_error_log;
auth_basic off;
# SSL only
ssl on;
ssl_certificate /etc/nginx/ssl/nginx.crt;
ssl_certificate_key /etc/nginx/ssl/nginx.key;
ssl_session_timeout 5m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
location /socket.io/ {
include uwsgi_params;
uwsgi_buffering off;
uwsgi_pass unix:/home/ubuntu/app2/app2.sock;
proxy_http_version 1.1;
proxy_read_timeout 180s;
proxy_buffering on;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "Upgrade";
}
location / {deny all;}
location = /app2 { rewrite ^ /app2/; }
location /app2/ {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass http://localhost:8080;
proxy_read_timeout 90;
proxy_redirect http://localhost:8080 https://server_name_2:1015/app2;
try_files $uri #app2; }
location #app2 {
include uwsgi_params;
uwsgi_read_timeout 180s;
uwsgi_send_timeout 180s;
proxy_read_timeout 180s;
uwsgi_pass unix:/home/ubuntu/app2/app2.sock;
}}
Based on my research problem is in uWSGI, for some reason it is not receiving any wss calls. From client perspective socket connection is Finished instead of 101 Pending.
Issue persist no matter of what client I'm using.
In app1 I can see each attemp&error of socket connection in both nginx and uwsgi (vassal) log files, in case of app2 I can only see 499 error for each socket connection attempt, without matching entry in vassal log.
Initially I was blaming uwsgi websocket server, that could host only 1 application, but I can freely duplicate app1 as many times as I want under different vassals and nginx sites, websocket connections are fine.
What I've tried
switching between lib versions (gevent must be >= 1.3.6)
using http socket instead of unix one
experiments with paths
juggling with buffer sizes on both nginx and uwsgi
Are there any known issues with python 3.7 & uwsgi & SocketIO integration? I'm out of ideas.