1*2c2f96dcSApple OSS Distributionsimport logging 2*2c2f96dcSApple OSS Distributionsimport socket 3*2c2f96dcSApple OSS Distributionsimport select 4*2c2f96dcSApple OSS Distributions 5*2c2f96dcSApple OSS Distributionsclass Interface(object): 6*2c2f96dcSApple OSS Distributions """Basic communication interface.""" 7*2c2f96dcSApple OSS Distributions def __init__(self, host_cfg, portnum): 8*2c2f96dcSApple OSS Distributions super(Interface, self).__init__() 9*2c2f96dcSApple OSS Distributions self.host_cfg = host_cfg 10*2c2f96dcSApple OSS Distributions self.portnum = portnum 11*2c2f96dcSApple OSS Distributions self.pkt_size = 8192 12*2c2f96dcSApple OSS Distributions self.socket = None 13*2c2f96dcSApple OSS Distributions self.isblocking = True 14*2c2f96dcSApple OSS Distributions logging.debug("created %s" % str(self)) 15*2c2f96dcSApple OSS Distributions 16*2c2f96dcSApple OSS Distributions def connect(self): 17*2c2f96dcSApple OSS Distributions self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 18*2c2f96dcSApple OSS Distributions self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 19*2c2f96dcSApple OSS Distributions self.socket.bind((self.host_cfg, self.portnum)) 20*2c2f96dcSApple OSS Distributions logging.debug("Initializing network interface for communication host: %s:%d", self.host_cfg, self.portnum) 21*2c2f96dcSApple OSS Distributions self.socket.listen(5) 22*2c2f96dcSApple OSS Distributions num_retries = 3 23*2c2f96dcSApple OSS Distributions while num_retries > 0: 24*2c2f96dcSApple OSS Distributions ra,wa,ea = select.select([self.socket], [], [], 30) 25*2c2f96dcSApple OSS Distributions if not ra: 26*2c2f96dcSApple OSS Distributions num_retries -= 1 27*2c2f96dcSApple OSS Distributions logging.warning("timeout: select returned empty list. retrying..") 28*2c2f96dcSApple OSS Distributions continue 29*2c2f96dcSApple OSS Distributions self.connection, addr = self.socket.accept() 30*2c2f96dcSApple OSS Distributions logging.info("Connected to client from %s" % str(addr)) 31*2c2f96dcSApple OSS Distributions return True 32*2c2f96dcSApple OSS Distributions logging.error("Failed to connect. Exiting after multiple attempts.") 33*2c2f96dcSApple OSS Distributions return False 34*2c2f96dcSApple OSS Distributions 35*2c2f96dcSApple OSS Distributions def read(self): 36*2c2f96dcSApple OSS Distributions if self.isblocking: 37*2c2f96dcSApple OSS Distributions #BUG TODO make this unblocking soon 38*2c2f96dcSApple OSS Distributions #logging.warn("blocking read bug") 39*2c2f96dcSApple OSS Distributions self.connection.settimeout(15) 40*2c2f96dcSApple OSS Distributions self.isblocking = False 41*2c2f96dcSApple OSS Distributions r_bytes = bytes() 42*2c2f96dcSApple OSS Distributions try: 43*2c2f96dcSApple OSS Distributions r_bytes = self.connection.recv(self.pkt_size) 44*2c2f96dcSApple OSS Distributions except Exception as e: 45*2c2f96dcSApple OSS Distributions #logging.debug("Found exception in recv. %s " % (str(e))) 46*2c2f96dcSApple OSS Distributions pass 47*2c2f96dcSApple OSS Distributions 48*2c2f96dcSApple OSS Distributions return r_bytes 49*2c2f96dcSApple OSS Distributions 50*2c2f96dcSApple OSS Distributions def write(self, str): 51*2c2f96dcSApple OSS Distributions if not self.isblocking: 52*2c2f96dcSApple OSS Distributions self.connection.setblocking(1) 53*2c2f96dcSApple OSS Distributions self.isblocking = True 54*2c2f96dcSApple OSS Distributions return self.connection.send(str.encode()) 55*2c2f96dcSApple OSS Distributions 56*2c2f96dcSApple OSS Distributions def close(self): 57*2c2f96dcSApple OSS Distributions if self.connection: 58*2c2f96dcSApple OSS Distributions logging.debug('closing connection.') 59*2c2f96dcSApple OSS Distributions self.connection.close() 60*2c2f96dcSApple OSS Distributions return self.socket 61*2c2f96dcSApple OSS Distributions 62*2c2f96dcSApple OSS Distributions def __str__(self): 63*2c2f96dcSApple OSS Distributions return "interface: %s %d" % (self.host_cfg, self.portnum) 64