[tornado] My Tornado server cannot be accessed by other devices in the local network. Where did I do wrong?

[Akmal Hakimi]

So this is my main code that will randomly push the data to the tornado web
server:

import time
from random import randint
from web_app import WebAppModule

# Start webapp
web_app_client = WebAppModule()
web_app_client.initialize_web_app_client(web_app_client)

def random_int(max):
return (randint(0, max))

def send_message():

name_arr = ["John Doe","Danial Johnson","Zack
Smith","Cheryl","Jeremy Chong","Sivakumar","David Gilbert","Ted Stinson"]
id_arr =
["018359","018332","015421","014656","015114","017712","014651","015892"]
category_arr =
["Admin","Staff","Staff","Staff","Staff","Staff","Staff","VIP"]
preference_arr = ["Milk Tea","White Coffee","Green Tea","Black
Coffee","Mocha Coffee","Caramel Coffee","White Coffee","Black Coffee"]

r = random_int(7)
print name_arr[r] + " detected..."

web_app_client.broadcast_message(name_arr[r],id_arr[r],category_arr[r],preference_arr[r])

if __name__ == "__main__":

print "Starting web app..."
time.sleep(5)
while True:
send_message()
time.sleep(2)

cam.release()

And this is the code for the Tornado server:

#!/usr/bin/python
# -*- encoding: UTF-8 -*-

import tornado.ioloop
import tornado.web
import tornado.websocket
import tornado.template
import time
import threading
import os
import logging
clients = []
wsThread = None

web_app_client = None

class WebAppModule():
def __init__(self):
global wsThread
if wsThread==None:
wsThread = threading.Thread(target=start_websocket).start()

def initialize_web_app_client(self,client):
global web_app_client
web_app_client = client

def
broadcast_message(self,username="N/A",userid="N/A",category="N/A",preference="N/A"):
for client in clients:
if imageurl=="":
imageurl='{{ static_url("face/default.jpg") }}'
msg = {'username': username, 'userid': userid,'category':
category, 'preference': preference,}
global clients

client.write_message(msg)
self.process_running = False
print "Execution paused..."
while self.process_running==False:
pass
print "Execution resumed..."

def start_websocket():
application.listen(9000)
tornado.ioloop.IOLoop.instance().start()

class MainHandler(tornado.web.RequestHandler):
def get(self):
self.render('web/index.html')

class WSHandler(tornado.websocket.WebSocketHandler):
def open(self):
clients.append(self)
print 'web app connection opened...'

def check_origin(self, origin):
return True

def on_message(self, message):
print 'received:', message
if "DONE" in message:
web_app_client.process_running = True

def on_close(self):
clients.remove(self)
print 'connection closed...'

settings = {
"static_path": os.path.join(os.path.dirname(__file__), "web"),
}

application = tornado.web.Application([
(r'/ws', WSHandler),
(r'/', MainHandler),
], **settings)


From what I understand, sending the message to all client via "for client
in clients" should make it work. However, it didn't for my case. Where did
I do wrong?

Whenever I try connecting from other devices, the console is showing

"Websocket connection to 'ws://localhost:9000/ws' failed. Error in
connection establishment: net::ERR_CONNECTION_REFUSED"

[Ben Darnell]

Tornado is not designed to be used with multiple threads. You must call all
Tornado methods such as write_message() from the IOLoop thread. Use
IOLoop.current().add_callback() to transfer control to the IOLoop thread.
See http://www.tornadoweb.org/en/stable/#threads-and-wsgi for more.

-Ben

Post by Akmal Hakimi
So this is my main code that will randomly push the data to the tornado
import time
from random import randint
from web_app import WebAppModule
# Start webapp
web_app_client = WebAppModule()
web_app_client.initialize_web_app_client(web_app_client)
return (randint(0, max))
name_arr = ["John Doe","Danial Johnson","Zack
Smith","Cheryl","Jeremy Chong","Sivakumar","David Gilbert","Ted Stinson"]
id_arr =
["018359","018332","015421","014656","015114","017712","014651","015892"]
category_arr =
["Admin","Staff","Staff","Staff","Staff","Staff","Staff","VIP"]
preference_arr = ["Milk Tea","White Coffee","Green Tea","Black
Coffee","Mocha Coffee","Caramel Coffee","White Coffee","Black Coffee"]
r = random_int(7)
print name_arr[r] + " detected..."
web_app_client.broadcast_message(name_arr[r],id_arr[r],category_arr[r],preference_arr[r])
print "Starting web app..."
time.sleep(5)
send_message()
time.sleep(2)
cam.release()
#!/usr/bin/python
# -*- encoding: UTF-8 -*-
import tornado.ioloop
import tornado.web
import tornado.websocket
import tornado.template
import time
import threading
import os
import logging
clients = []
wsThread = None
web_app_client = None
global wsThread
wsThread = threading.Thread(target=start_websocket).start()
global web_app_client
web_app_client = client
def
imageurl='{{ static_url("face/default.jpg") }}'
category, 'preference': preference,}
global clients
client.write_message(msg)
self.process_running = False
print "Execution paused..."
pass
print "Execution resumed..."
application.listen(9000)
tornado.ioloop.IOLoop.instance().start()
self.render('web/index.html')
clients.append(self)
print 'web app connection opened...'
return True
print 'received:', message
web_app_client.process_running = True
clients.remove(self)
print 'connection closed...'
settings = {
"static_path": os.path.join(os.path.dirname(__file__), "web"),
}
application = tornado.web.Application([
(r'/ws', WSHandler),
(r'/', MainHandler),
], **settings)
From what I understand, sending the message to all client via "for client
in clients" should make it work. However, it didn't for my case. Where did
I do wrong?
Whenever I try connecting from other devices, the console is showing

"Websocket connection to 'ws://localhost:9000/ws' failed. Error in
connection establishment: net::ERR_CONNECTION_REFUSED"

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