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"""Tcp client for asynchronous uhd message tcp port"""
import threading
import Queue
import time
import socket
class _TcpAsyncClient(threading.Thread):
"""Thead for message polling"""
queue = Queue.Queue()
q_quit = Queue.Queue()
ip_address = None
port = None
BUFFER_SIZE = 1
def __init__(self, ip_address, port):
super(_TcpAsyncClient, self).__init__()
self.ip_address = ip_address
self.port = port
def __exit__(self):
self.stop()
def run(self):
"""connect and poll messages to queue"""
#Establish connection
sock = None
print("Connecting to asynchronous uhd message tcp port " + str(self.port))
while self.q_quit.empty():
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((self.ip_address, self.port))
break
except socket.error:
print("connecting to asynchronous uhd message tcp port " + str(self.port))
#traceback.print_exc()
sock.close()
time.sleep(0.5)
print("Connected to asynchronous uhd message tcp port " + str(self.port))
#Read messages
sock.settimeout(1)
while self.q_quit.empty():
try:
data = sock.recv(self.BUFFER_SIZE)
self.queue.put(data)
except socket.timeout:
pass
sock.close()
def stop(self):
"""stop thread"""
print("stop tcp_async uhd message tcp thread")
self.q_quit.put("end")
class UhdAsyncMsg(object):
"""Creates a thread to connect to the asynchronous uhd messages tcp port"""
def __init__(self, ip_address = "127.0.0.1", port = 47010):
self.tcpa = _TcpAsyncClient(ip_address, port)
self.tcpa.start()
def __exit__(self):
self.tcpa.stop()
def stop(self):
"""stop tcp thread"""
self.tcpa.stop()
def get_res(self):
"""get received messages as string of integer"""
out = ""
while not self.tcpa.queue.empty():
out += str(ord(self.tcpa.queue.get()))
return out
def has_msg(self):
"""Checks if one or more messages were received and empties the message queue"""
return self.get_res() != ""
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