I'm connecting to the same websocket address but for some reason I can't receive data using websockets+asyncio.
However, it does work when using websocket as well as using a raw websocket connection with Postman.
if SOCKET is the address
Using websockets + asyncio
import asyncio
import websockets
SOCKET = 'wss://api...'
async def handle(uri):
async with websockets.connect(uri) as websocket:
while True:
print(await websocket.recv())
asyncio.get_event_loop().run_until_complete(handle(SOCKET))
Using websocket
from websocket import create_connection
ws = create_connection(SOCKET)
while True:
try:
result = ws.recv()
print(result)
Does anyone know what can possibly be wrong with the first option? I'm actually following a python sample request suggested by a site's documentation when using websockets+asyncio.
Related
There is some game that communicates with the server via a Websocket connection. I want to simulate this connection in python. When I click on the link, in the network tab, I see these connections: Image.
I copy the first message that the client sends in base64 format and try to reproduce it in code:
import asyncio, base64
from websockets import connect
URL = "wss://c7.eu.tankionline.com:9090/"
MSG_1 = base64.b64decode("ACoAA1TOlEGHY2d6XOx8gfqrE53STCBraCMoiOob+n2N6U10AAAAAAX2kcw=")
async def setup():
async with connect(URL) as websocket:
await websocket.send(MSG_1)
resp = await websocket.recv()
print(resp)
asyncio.run(setup())
But there is no response from the server. Why is that?
I am trying to create a code using rtmidi and websockets, which listenes for midi input and then sends data through websocket to all connected users. The data is beeing sent inside if statement, when some condition is met. In this test, the condition is simply random number comparison. Client can conenct to websocket server, however never receives any dat, even though server confirms that it was sent.
When I added asyncio.sleep(0) just before sending data, everything started working. Why is that? Should I use sleep, or is there a better solution?
I removed everything rtmidi related from example to make it easier, the problem is still the same.
Server code:
import asyncio
import websockets
import random
async def key(websocket, path):
print("port connected ", path)
while True:
rnd=random.randrange(0,300000)
if rnd==0:
#await asyncio.sleep(0) #when not commented everything works
print("sent")
await websocket.send("hello")
start_server = websockets.serve(key, "127.0.0.1", 8765)
print("done")
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()
Client code:
import asyncio
import websockets
async def gdata():
uri = "ws://127.0.0.1:8765"
async with websockets.connect(uri) as websocket:
while True:
data = await websocket.recv()
print(data)
asyncio.get_event_loop().run_until_complete(gdata())
I am currently working on a django project where I use aiohttp to communicate between the backend and frontend. I wanted to get the IP address of a client when a request is made from the frontend. Looked in different docs but none seems to point to exactly how to get the IP address using aiohttp. Someone Help!
from aiohttp import web
async def handler(request):
ws = web.WebSocketResponse()
await ws.prepare(request)
try:
async for msg in ws:
# handle incoming messages
# use ws.send_str() to send data back
...
finally:
task.cancel()
Based on the aiohttp docs you can get the originating IP address of a client initiated HTTP request from requests remote parameter (request.remote).
I'm trying to create a unidirectional websocket connection between the client and server (python). The libraries I've currently been prototyping with are websockets and simplesocketserver. I've got a hello world example getting from the server to the client, but I need to be able to send data from the backend to the client unprompted from the client. All of the websockets examples seem to show the server listening to the client and then responding.
So far I've tried:
Using websockets 8.0, sending data from server to client unprompted, this works but only with hard-coded strings, I don't understand how to send real data on demand unprompted from the client
Using simplesocketserver in the same exact manner
Started investigating server sent events - is this more appropriate?
Example from the websockets documentation:
import asyncio
import websockets
async def hello(websocket, path):
name = await websocket.recv()
print(f"< {name}")
greeting = f"Hello {name}!"
await websocket.send(greeting)
print(f"> {greeting}")
start_server = websockets.serve(hello, "localhost", 8765)
asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()
Note: the need for unidirectional communication is due to existing architecture.
Any guidance or resources on this would be great, I hope I'm overlooking something easy. Thank you!
I came across a similar issue. After some trial and error I found a solution that works for me, maybe so it does for you. I've tested this on Linux and with Firefox and mobile Safari (parallel).
The InputThread waits for input (words) on the command line and writes them into a list, that is sent to all connected clients each time a new string is appended or a client is connected.
Code snippet
import asyncio
import websockets
import json
from threading import Thread
words = []
clients = []
async def register_client(websocket, path):
# register new client in list and keep connection open
clients.append(websocket)
await send_to_all_clients()
while True:
await asyncio.sleep(10)
async def send_to_all_clients():
global words
for i, ws in list(enumerate(clients))[::-1]:
try:
await ws.send(json.dumps({"words": words}))
except websockets.exceptions.ConnectionClosedError:
# remove if connection closed
del clients[i]
class InputThread(Thread):
def run(self):
global words
async def sending_loop():
while True:
i = input()
if not i.strip():
continue
words.append({"options": i.strip().slit()})
await send_to_all_clients()
asyncio.run(sending_loop())
InputThread().start()
asyncio.get_event_loop().run_until_complete(
websockets.serve(register_client, "localhost", 8765))
asyncio.get_event_loop().run_forever()
I have this server
https://github.com/crossbario/autobahn-python/blob/master/examples/twisted/websocket/echo_tls/server.py
And I want to connect to the server with this code:
ws = create_connection("wss://127.0.0.1:9000")
What options do I need to add to create_connection? Adding sslopt={"cert_reqs": ssl.CERT_NONE} does not work:
websocket._exceptions.WebSocketBadStatusException: Handshake status 400
This works
import asyncio
import websockets
import ssl
async def hello():
async with websockets.connect('wss://127.0.0.1:9000',ssl=ssl.SSLContext(protocol=ssl.PROTOCOL_TLS)) as websocket:
data = 'hi'
await websocket.send(data)
print("> {}".format(data))
response = await websocket.recv()
print("< {}".format(response))
asyncio.get_event_loop().run_until_complete(hello())
For me the option from the question seems to work:
from websocket import create_connection
import ssl
ws = create_connection("wss://echo.websocket.org", sslopt={"cert_reqs": ssl.CERT_NONE})
ws.send("python hello!")
print (ws.recv())
ws.close()
See also here:
https://github.com/websocket-client/websocket-client#faq
Note: I'm using win7 with python 3.6.5 with following packages installed(pip):
simple-websocket-server==0.4.0
websocket-client==0.53.0
websockets==6.0