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I am creating a socket client and trying to obtain some data. In order to do so, I need to connect to a web server via socket and the server actually creates another socket which listens and awaits for the data after which sends back to the client.

The problem I have with the code below is that my socket client does not wait for the incoming data from the server and just accepts empty data.

How can I wait for a non-empty data from the server using Python sockets?

My code:

import sys
import json
import socketIO_client
import time

host = 'https://SOME_URL'

socketIO = socketIO_client.SocketIO(host, params="email" : "edmund@gmail.com")
def on_connect(*args):
 print "socket.io connected"

def on_disconnect(*args):
 print "socketIO diconnected"

socketIO.on('connect', on_connect)
socketIO.on('disconnect', on_disconnect)

def on_response_state(*args):
 print args # Prints ()

socketIO.emit('receive_state',on_response_state)
socketIO.wait_for_callbacks(seconds=3)

Here's an example using socket. Using s.accept(), the client will wait till a client accepts the connection before starting the while loop to receive data. This should help with your problem.

def receiver():
 PORT = 123
 CHUNK_SIZE = 1024

 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
 s.bind(('0.0.0.0', PORT))
 s.listen(1)
 conn,address=s.accept() # accept an incoming connection using accept() method which will block until a new client connects

 while True:
 datachunk = conn.recv(CHUNK_SIZE) # reads data chunk from the socket in batches using method recv() until it returns an empty string
 if not datachunk:
 break # no more data coming in, so break out of the while loop
 data.append(datachunk) # add chunk to your already collected data

 conn.close()
 print(data)
 return

receiver()

put the recv socket in a while thread.

like this:

 def rec(self):

 while 1:
 sleep 0.01
 rdata = self.clientsocket.recv(self.buffsize)

 print("rec from server: ", rdata.decode('utf8'),'n','press enter to continue')

....

t2 = threading.Thread(target=y.rec, name="rec") 

t2.start()

Since you're using the SocketIO library to include parameters (achieved using requests), and want to emit a message, you can wait indefinitely for a response by not specifying a wait time.

with SocketIO(host, params="email" : "edmund@gmail.com") as socketIO:
 def on_response_state(*args):
 print args # Prints ()

 socketIO.emit('receive_state', on_response_state)
 socketIO.wait()