Server Code:
import http.server
import socketserver
PORT = 8000
Handler = http.server.SimpleHTTPRequestHandler
with socketserver.TCPServer(("", PORT), Handler) as httpd:
print("serving at port", PORT)
httpd.serve_forever()
Client Code:
import http.client
conn = http.client.HTTPSConnection("localhost", 8000)
conn.request("HEAD","/index.html")
I get ssl.SSLError: [SSL: UNKNOWN_PROTOCOL] unknown protocol (_ssl.c:777)
error on client side, and code 400, message Bad request version on server side. I have no idea what's wrong with it.
Related
I'm trying to get my webapp to send messages and I can't figure out why it isn't working. There are no errors that I can see, it's just that the actions in my event.py function aren't happening. I am running a gunicorn server with eventlet workers serving a flask app.
Here's the command that starts the gunicorn server through docker:
CMD [ "gunicorn", "--reload", "-b", "0.0.0.0:5000", "--worker-class", "eventlet", "-w", "1", "app:app"]
here's the relevant code on notes.html:
// Imports socketio
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.0.1/socket.io.js" integrity="sha512-q/dWJ3kcmjBLU4Qc47E4A9kTB4m3wuTY7vkFJDTZKjTs8jhyGQnaUrxa0Ytd0ssMZhbNua9hE+E7Qv1j+DyZwA==" crossorigin="anonymous"></script>
<script type="text/javascript" charset="utf-8">
// sets domain to talk to. (empty sets it to localhost)
const socket = io()
// send message to server on trigger from form.
socket.emit('send_new_session', new_session_form_id.value, new_session_form_number.value, new_session_form_title.value, new_session_form_synopsis.value)
console.log('send_new_session')
// console logs the message here, do I know it's getting this far. The problem seems to be that the server isn't getting the message for some reason.
events.py:
from . import db, socketio
from .classes import *
from flask_socketio import emit
#socketio.on('send_new_session')
def send_new_session(id, number, title, synopsis=None):
print("arrived!!!!!!!!!!!")
# more code that adds the new session the the database
..
I have the logging correctly set up to stdout but I never see the "arrived" message, so I know it's never hitting the server.
here is the server logs for when I send the message:
rest-server | Bpt-ydbpGYLF-HGKAAAC: Sending packet OPEN data {'sid': 'Bpt-ydbpGYLF-HGKAAAC', 'upgrades': ['websocket'], 'pingTimeout': 20000, 'pingInterval': 25000}
rest-server | Bpt-ydbpGYLF-HGKAAAC: Received packet MESSAGE data 0
rest-server | Bpt-ydbpGYLF-HGKAAAC: Sending packet MESSAGE data 0{"sid":"MRAxFiGYyLB3C6MBAAAD"}
rest-server | Bpt-ydbpGYLF-HGKAAAC: Received request to upgrade to websocket
rest-server | Bpt-ydbpGYLF-HGKAAAC: Upgrade to websocket successful
rest-server | Bpt-ydbpGYLF-HGKAAAC: Received packet MESSAGE data 2["send_new_session","1","2","foo","bar"]
rest-server | received event "send_new_session" from MRAxFiGYyLB3C6MBAAAD [/]
rest-server | Bpt-ydbpGYLF-HGKAAAC: Sending packet PING data None
rest-server | Bpt-ydbpGYLF-HGKAAAC: Received packet PONG data
you can see in the log that the message is in fact being sent and received, but for some reason the actions in the event aren't happening. I've been trying everything I can think of for a couple days not. any help would be greatly appreciated!!
Everything below here is probably not relevant, but if it it helps, this is how I set up the app:
file set up:
/app
--app.py
--requirements.txt
--Dockerfile
--docker-compose.yml
--.flaskenv
--/project
----/static
----/templates
----__init__.py
----settings.py
----events.py
----BONapp.py
----auth.py
etc...
settings.py
import os
from flask import Flask
app = Flask(__name__)
db_password = os.environ.get('DB_PASS')
app.config['SQLALCHEMY_DATABASE_URI'] = 'mysql+pymysql://root:' + db_password + '#bonmysqldb:3306/BON'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
app.config['SECRET_KEY'] = db_password
init.py
from flask_login import LoginManager
from flask_migrate import Migrate
from flask_sqlalchemy import SQLAlchemy
from flask_socketio import SocketIO
from .settings import app
db = SQLAlchemy(app)
socketio = SocketIO(app, logger=True, engineio_logger=True)
def create_app():
migrate = Migrate(app, db)
from .classes import Users
db.init_app(app)
socketio.init_app(app)
login_manager = LoginManager()
login_manager.login_view = 'auth.login'
login_manager.init_app(app)
# provide login_manager with a unicode user ID
#login_manager.user_loader
def load_user(user_id):
return Users.query.get(int(user_id))
# blueprint for auth routes of app
from .auth import auth as auth_blueprint
app.register_blueprint(auth_blueprint)
# blueprint for non-auth parts of app
from .BONapp import main as main_blueprint
app.register_blueprint(main_blueprint)
return app
app.py
from project.__init__ import create_app
app = create_app()
I figured it out while reading over my question again...
it was in events.py I changed:
from . import db, socketio
to:
from .__init__ import db, socketio
I'm not exactly sure why that mattered but it fixed it.
facepalm
Setup:
I have 3 docker containers
1) For Kafka
2) For Zookeeper
3) For JupyterLab
I setup networking between these containers and I see that kafka producer is able to run and produce the data.
KafkaProducer.ipynb
KAFKA_BROKER = ['172.20.0.2:9093']
from kafka import KafkaProducer
from kafka.errors import KafkaError
producer = KafkaProducer(bootstrap_servers=KAFKA_BROKER)
for _ in range(100):
print("sending")
producer.send('my-topic', key=b'foo', value=b'bar')
print("success")
Here the send() sends message 100 times.
KafkaConsumer.ipynb
KAFKA_BROKER = ['172.20.0.2:9093']
from kafka import KafkaConsumer
consumer = KafkaConsumer('my-topic',group_id='my-group',bootstrap_servers=KAFKA_BROKER)
print("Comm success")
for message in consumer:
# message value and key are raw bytes -- decode if necessary!
# e.g., for unicode: `message.value.decode('utf-8')`
print ("%s:%d:%d: key=%s value=%s" % (message.topic, message.partition,
message.offset, message.key,
message.value))
In the above consumer code the line print("Comm success") never gets gets executed. Based on producer code execution, the network is open and jupyter is able to talk to kafka broker. But, client is not able to connect to the same broker for data consumption. How can I start debugging this?
By default auto.offset.reset value is latest, so set it to earliest with new group.id
consumer = KafkaConsumer('my-topic',group_id='new-group',auto_offset_reset = 'earliest',bootstrap_servers=KAFKA_BROKER)
I am getting the error:
WebSocket connection to 'wss://iot.XXXX.GG:8883/mqtt' failed: Connection closed before receiving a handshake response
When trying to connect to a remote Mosquitto broker over SSL using Javascript Paho library on Windows 10.
What I have already tried is shown in the following listing:
<script type = "text/javascript" language = "javascript">
var mqtt;
var reconnectTimeout = 2000;
var host="iot.XXXX.GG" ;
var port=8883;
function onConnect() {
// Once a connection has been made, make a subscription and send a message.
console.log("Connected ");
message = new Paho.MQTT.Message("Hello World");
message.destinationName = "sensor1";
mqtt.send(message);
}
function MQTTconnect() {
console.log("connecting to "+ host +" "+ port);
mqtt = new Paho.MQTT.Client(host,port,"clientjs");
var options = {
useSSL:true,
timeout: 3,
userName:"abc",
password:"qweqwe",
onSuccess: onConnect
};
mqtt.connect(options);
};
</script>
Expected results should be a message saying 'Connected. Actual results are shown at the beginning of this post as the error I get.
By the way, my Mosquitto.conf file is:
allow_anonymous false
password_file /etc/mosquitto/passwd
listener 1883 localhost
protocol mqtt
listener 8883
certfile /etc/letsencrypt/live/iot.XXXX.GG/cert.pem
cafile /etc/letsencrypt/live/iot.XXXX.GG/chain.pem
keyfile /etc/letsencrypt/live/iot.XXXX.GG/privkey.pem
# WebSockets - insecure
listener 8083
protocol websockets
#http_dir /home/ΧΧΧΧ/domains/iot.XXXX.GG/public_html
#certfile /etc/letsencrypt/live/iot.XXXX.GG/cert.pem
#cafile /etc/letsencrypt/live/iot.XXXX.GG/chain.pem
#keyfile /etc/letsencrypt/live/iot.XXXX.GG/privkey.pem
The Paho MQTT client can only connect to a broker configured to run MQTT over WebSockets.
The mosquitto.conf file you have provided has 3 listeners defined.
The default native MQTT listener on port 1883 bound only to localhost
A native MQTT over SSL listener on port 8883 using the letsencrypt certificate
A MQTT over WebSockets listener on port 8083 with the certificates commented out.
If you want to connect from the web page using MQTT over WebSockets and SSL you need to uncomment the certificates from the 3rd listener and change the port you are connecting to in the page to 8083 (not 8883)
i try to perform a GET request to my localhost server. i run the flutter application on a external device with android studio and the XAMPP/php server with the endpoint run on the pc too. now is the problem every time i run the GET request it run on a wrong port. i write in the url port 80 but flutter perform it on 53555 or other 53...
i try to change the url but nothing changed.
here is the code and the error message
var url = new Uri.http("192.168.2.23:80", "/login", {"username":username,"password":password});
print(url);
var client = http.Client();
http.Response response = await client.get(url);
print('Response status: ${response.statusCode}');
print('Response body: ${response.body}');
this is the error
[ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: SocketException: OS Error: Connection timed out, errno = 110, address = 192.168.2.23, port = 53695
I have a Rpi-A connected to internet via 3G surf-stick and Rpi-B connected to internet via a WiFi hotspot. Rpi-A has a public ip address and also ports 1883 and 8883 are open. Both raspberry Pi's are on different networks. I am attempting to send binary data using MQTT from Rpi-B to Rpi-A.
update: I used the below code to test the MQTT connection. replacing XX.XX.XX.XX with public IP of raspberry Pi. Still I end up getting this error--->
error: [Errno 10060] A connection attempt failed because the connected
party did not properly respond after a period of time, or established
connection failed because connected host has failed to respond.
what might be the possible reason for this error ? Is there anything missing in my code
import paho.mqtt.client as mqtt
import time
def on_connect(client, userdata, flags, rc):
print("Connected with result code " + str(rc))
client = mqtt.Client()
client.on_connect = on_connect
client.connect("xx.xx.xxx.x", 1883, 60)
client.loop_start()
while True:
time.sleep(2)
client.publish('Due_0.72/cmd/in','hello')
print "publish.."