1*f6217f89SApple OSS Distributionsimport logging 2*f6217f89SApple OSS Distributionsimport socket 3*f6217f89SApple OSS Distributionsimport select 4*f6217f89SApple OSS Distributions 5*f6217f89SApple OSS Distributionsclass Interface(object): 6*f6217f89SApple OSS Distributions """Basic communication interface.""" 7*f6217f89SApple OSS Distributions def __init__(self, host_cfg, portnum): 8*f6217f89SApple OSS Distributions super().__init__() 9*f6217f89SApple OSS Distributions self.host_cfg = host_cfg 10*f6217f89SApple OSS Distributions self.portnum = portnum 11*f6217f89SApple OSS Distributions self.pkt_size = 8192 12*f6217f89SApple OSS Distributions self.socket = None 13*f6217f89SApple OSS Distributions self.isblocking = True 14*f6217f89SApple OSS Distributions logging.debug("created %s" % str(self)) 15*f6217f89SApple OSS Distributions 16*f6217f89SApple OSS Distributions def connect(self): 17*f6217f89SApple OSS Distributions self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 18*f6217f89SApple OSS Distributions self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 19*f6217f89SApple OSS Distributions self.socket.bind((self.host_cfg, self.portnum)) 20*f6217f89SApple OSS Distributions logging.debug("Initializing network interface for communication host: %s:%d", self.host_cfg, self.portnum) 21*f6217f89SApple OSS Distributions self.socket.listen(5) 22*f6217f89SApple OSS Distributions num_retries = 3 23*f6217f89SApple OSS Distributions while num_retries > 0: 24*f6217f89SApple OSS Distributions ra,wa,ea = select.select([self.socket], [], [], 30) 25*f6217f89SApple OSS Distributions if not ra: 26*f6217f89SApple OSS Distributions num_retries -= 1 27*f6217f89SApple OSS Distributions logging.warning("timeout: select returned empty list. retrying..") 28*f6217f89SApple OSS Distributions continue 29*f6217f89SApple OSS Distributions self.connection, addr = self.socket.accept() 30*f6217f89SApple OSS Distributions logging.info("Connected to client from %s" % str(addr)) 31*f6217f89SApple OSS Distributions return True 32*f6217f89SApple OSS Distributions logging.error("Failed to connect. Exiting after multiple attempts.") 33*f6217f89SApple OSS Distributions return False 34*f6217f89SApple OSS Distributions 35*f6217f89SApple OSS Distributions def read(self): 36*f6217f89SApple OSS Distributions if self.isblocking: 37*f6217f89SApple OSS Distributions #BUG TODO make this unblocking soon 38*f6217f89SApple OSS Distributions #logging.warn("blocking read bug") 39*f6217f89SApple OSS Distributions self.connection.settimeout(15) 40*f6217f89SApple OSS Distributions self.isblocking = False 41*f6217f89SApple OSS Distributions r_bytes = bytes() 42*f6217f89SApple OSS Distributions try: 43*f6217f89SApple OSS Distributions r_bytes = self.connection.recv(self.pkt_size) 44*f6217f89SApple OSS Distributions except Exception as e: 45*f6217f89SApple OSS Distributions #logging.debug("Found exception in recv. %s " % (str(e))) 46*f6217f89SApple OSS Distributions pass 47*f6217f89SApple OSS Distributions 48*f6217f89SApple OSS Distributions return r_bytes 49*f6217f89SApple OSS Distributions 50*f6217f89SApple OSS Distributions def write(self, str): 51*f6217f89SApple OSS Distributions if not self.isblocking: 52*f6217f89SApple OSS Distributions self.connection.setblocking(1) 53*f6217f89SApple OSS Distributions self.isblocking = True 54*f6217f89SApple OSS Distributions return self.connection.send(str.encode()) 55*f6217f89SApple OSS Distributions 56*f6217f89SApple OSS Distributions def close(self): 57*f6217f89SApple OSS Distributions if self.connection: 58*f6217f89SApple OSS Distributions logging.debug('closing connection.') 59*f6217f89SApple OSS Distributions self.connection.close() 60*f6217f89SApple OSS Distributions return self.socket 61*f6217f89SApple OSS Distributions 62*f6217f89SApple OSS Distributions def __str__(self): 63*f6217f89SApple OSS Distributions return "interface: %s %d" % (self.host_cfg, self.portnum) 64