George2: Created page with " #Blocking vs Non Blocking Sockets #Blocking stops #Non Blocking runs in the background """ https://docs.python.org/3.8/howto/sockets.html#non-blocking-..."

2022-01-14T22:53:02Z

Created page with "<source lang="python"> #Blocking vs Non Blocking Sockets #Blocking stops #Non Blocking runs in the background """ https://docs.python.org/3.8/howto/sockets.html#non-blocking-..."

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<source lang="python">
#Blocking vs Non Blocking Sockets
#Blocking stops
#Non Blocking runs in the background

"""
https://docs.python.org/3.8/howto/sockets.html#non-blocking-sockets
ready_to_read, ready_to_write, in_error = \
select.select(
potential_readers,
potential_writers,
potential_errs,
timeout)
"""
#Imports
import logging
import socket
import select

logging.basicConfig(format='%(levelname)s - %(asctime)s: %(message)s',datefmt='%H:%M:%S', level=logging.DEBUG)

#Blocking socket example
def create_blocking(host,ip):
logging.info('Blocking - creating socket')
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

logging.info('Blocking - connecting')
s.connect((host,ip))

logging.info('Blocking - connected')
logging.info('Blocking - sending...')
s.send(b'hello\r\n')

logging.info('Blocking - waiting...')
data = s.recv(1024)
logging.info(f'Blocking - data= {len(data)}')
logging.info('Blocking - closing...')
s.close()

#Non Blocking socket example
def create_nonblocking(host,port):
logging.info('Non Blocking - creating socket')
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

logging.info('Non Blocking - connecting')
ret = s.connect_ex((host,port)) #BLOCKING

if ret != 0:
logging.info('Non Blocking - failed to connect!')
return

logging.info('Non Blocking - connected!')
s.setblocking(False)

inputs = [s]
outputs = [s]
while inputs:
logging.info('Non Blocking - waiting...')
readable,writable,exceptional = select.select(inputs,outputs,inputs,0.5)

for s in writable:
logging.info('Non Blocking - sending...')
data = s.send(b'hello\r\n')
logging.info(f'Non Blocking - sent: {data}')
outputs.remove(s)

for s in readable:
logging.info(f'Non Blocking - reading...')
data = s.recv(1024)
logging.info(f'Non Blocking - data: {len(data)}')
logging.info(f'Non Blocking - closing...')
s.close()
inputs.remove(s)
break

for s in exceptional:
logging.info(f'Non Blocking - error')
inputs.remove(s)
outputs.remove(s)
break

#Main
def main():
#create_blocking('voidrealms.com',80)
create_nonblocking('voidrealms.com',80)

if __name__ == "__main__":
main()
</source>

Non blocking sockets - Revision history

George2: Created page with " #Blocking vs Non Blocking Sockets #Blocking stops #Non Blocking runs in the background """ https://docs.python.org/3.8/howto/sockets.html#non-blocking-..."