1*e3723e1fSApple OSS Distributionsimport logging 2*e3723e1fSApple OSS Distributionsimport socket 3*e3723e1fSApple OSS Distributionsimport select 4*e3723e1fSApple OSS Distributions 5*e3723e1fSApple OSS Distributionsclass Interface(object): 6*e3723e1fSApple OSS Distributions """Basic communication interface.""" 7*e3723e1fSApple OSS Distributions def __init__(self, host_cfg, portnum): 8*e3723e1fSApple OSS Distributions super().__init__() 9*e3723e1fSApple OSS Distributions self.host_cfg = host_cfg 10*e3723e1fSApple OSS Distributions self.portnum = portnum 11*e3723e1fSApple OSS Distributions self.pkt_size = 8192 12*e3723e1fSApple OSS Distributions self.socket = None 13*e3723e1fSApple OSS Distributions self.isblocking = True 14*e3723e1fSApple OSS Distributions logging.debug("created %s" % str(self)) 15*e3723e1fSApple OSS Distributions 16*e3723e1fSApple OSS Distributions def connect(self): 17*e3723e1fSApple OSS Distributions self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 18*e3723e1fSApple OSS Distributions self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 19*e3723e1fSApple OSS Distributions self.socket.bind((self.host_cfg, self.portnum)) 20*e3723e1fSApple OSS Distributions logging.debug("Initializing network interface for communication host: %s:%d", self.host_cfg, self.portnum) 21*e3723e1fSApple OSS Distributions self.socket.listen(5) 22*e3723e1fSApple OSS Distributions num_retries = 3 23*e3723e1fSApple OSS Distributions while num_retries > 0: 24*e3723e1fSApple OSS Distributions ra,wa,ea = select.select([self.socket], [], [], 30) 25*e3723e1fSApple OSS Distributions if not ra: 26*e3723e1fSApple OSS Distributions num_retries -= 1 27*e3723e1fSApple OSS Distributions logging.warning("timeout: select returned empty list. retrying..") 28*e3723e1fSApple OSS Distributions continue 29*e3723e1fSApple OSS Distributions self.connection, addr = self.socket.accept() 30*e3723e1fSApple OSS Distributions logging.info("Connected to client from %s" % str(addr)) 31*e3723e1fSApple OSS Distributions return True 32*e3723e1fSApple OSS Distributions logging.error("Failed to connect. Exiting after multiple attempts.") 33*e3723e1fSApple OSS Distributions return False 34*e3723e1fSApple OSS Distributions 35*e3723e1fSApple OSS Distributions def read(self): 36*e3723e1fSApple OSS Distributions if self.isblocking: 37*e3723e1fSApple OSS Distributions #BUG TODO make this unblocking soon 38*e3723e1fSApple OSS Distributions #logging.warn("blocking read bug") 39*e3723e1fSApple OSS Distributions self.connection.settimeout(15) 40*e3723e1fSApple OSS Distributions self.isblocking = False 41*e3723e1fSApple OSS Distributions r_bytes = bytes() 42*e3723e1fSApple OSS Distributions try: 43*e3723e1fSApple OSS Distributions r_bytes = self.connection.recv(self.pkt_size) 44*e3723e1fSApple OSS Distributions except Exception as e: 45*e3723e1fSApple OSS Distributions #logging.debug("Found exception in recv. %s " % (str(e))) 46*e3723e1fSApple OSS Distributions pass 47*e3723e1fSApple OSS Distributions 48*e3723e1fSApple OSS Distributions return r_bytes 49*e3723e1fSApple OSS Distributions 50*e3723e1fSApple OSS Distributions def write(self, str): 51*e3723e1fSApple OSS Distributions if not self.isblocking: 52*e3723e1fSApple OSS Distributions self.connection.setblocking(1) 53*e3723e1fSApple OSS Distributions self.isblocking = True 54*e3723e1fSApple OSS Distributions return self.connection.send(str.encode()) 55*e3723e1fSApple OSS Distributions 56*e3723e1fSApple OSS Distributions def close(self): 57*e3723e1fSApple OSS Distributions if self.connection: 58*e3723e1fSApple OSS Distributions logging.debug('closing connection.') 59*e3723e1fSApple OSS Distributions self.connection.close() 60*e3723e1fSApple OSS Distributions return self.socket 61*e3723e1fSApple OSS Distributions 62*e3723e1fSApple OSS Distributions def __str__(self): 63*e3723e1fSApple OSS Distributions return "interface: %s %d" % (self.host_cfg, self.portnum) 64