1*8d741a5dSApple OSS Distributionsimport logging 2*8d741a5dSApple OSS Distributionsimport socket 3*8d741a5dSApple OSS Distributionsimport select 4*8d741a5dSApple OSS Distributions 5*8d741a5dSApple OSS Distributionsclass Interface(object): 6*8d741a5dSApple OSS Distributions """Basic communication interface.""" 7*8d741a5dSApple OSS Distributions def __init__(self, host_cfg, portnum): 8*8d741a5dSApple OSS Distributions super().__init__() 9*8d741a5dSApple OSS Distributions self.host_cfg = host_cfg 10*8d741a5dSApple OSS Distributions self.portnum = portnum 11*8d741a5dSApple OSS Distributions self.pkt_size = 8192 12*8d741a5dSApple OSS Distributions self.socket = None 13*8d741a5dSApple OSS Distributions self.isblocking = True 14*8d741a5dSApple OSS Distributions logging.debug("created %s" % str(self)) 15*8d741a5dSApple OSS Distributions 16*8d741a5dSApple OSS Distributions def connect(self): 17*8d741a5dSApple OSS Distributions self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 18*8d741a5dSApple OSS Distributions self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) 19*8d741a5dSApple OSS Distributions self.socket.bind((self.host_cfg, self.portnum)) 20*8d741a5dSApple OSS Distributions logging.debug("Initializing network interface for communication host: %s:%d", self.host_cfg, self.portnum) 21*8d741a5dSApple OSS Distributions self.socket.listen(5) 22*8d741a5dSApple OSS Distributions num_retries = 3 23*8d741a5dSApple OSS Distributions while num_retries > 0: 24*8d741a5dSApple OSS Distributions ra,wa,ea = select.select([self.socket], [], [], 30) 25*8d741a5dSApple OSS Distributions if not ra: 26*8d741a5dSApple OSS Distributions num_retries -= 1 27*8d741a5dSApple OSS Distributions logging.warning("timeout: select returned empty list. retrying..") 28*8d741a5dSApple OSS Distributions continue 29*8d741a5dSApple OSS Distributions self.connection, addr = self.socket.accept() 30*8d741a5dSApple OSS Distributions logging.info("Connected to client from %s" % str(addr)) 31*8d741a5dSApple OSS Distributions return True 32*8d741a5dSApple OSS Distributions logging.error("Failed to connect. Exiting after multiple attempts.") 33*8d741a5dSApple OSS Distributions return False 34*8d741a5dSApple OSS Distributions 35*8d741a5dSApple OSS Distributions def read(self): 36*8d741a5dSApple OSS Distributions if self.isblocking: 37*8d741a5dSApple OSS Distributions #BUG TODO make this unblocking soon 38*8d741a5dSApple OSS Distributions #logging.warn("blocking read bug") 39*8d741a5dSApple OSS Distributions self.connection.settimeout(15) 40*8d741a5dSApple OSS Distributions self.isblocking = False 41*8d741a5dSApple OSS Distributions r_bytes = bytes() 42*8d741a5dSApple OSS Distributions try: 43*8d741a5dSApple OSS Distributions r_bytes = self.connection.recv(self.pkt_size) 44*8d741a5dSApple OSS Distributions except Exception as e: 45*8d741a5dSApple OSS Distributions #logging.debug("Found exception in recv. %s " % (str(e))) 46*8d741a5dSApple OSS Distributions pass 47*8d741a5dSApple OSS Distributions 48*8d741a5dSApple OSS Distributions return r_bytes 49*8d741a5dSApple OSS Distributions 50*8d741a5dSApple OSS Distributions def write(self, str): 51*8d741a5dSApple OSS Distributions if not self.isblocking: 52*8d741a5dSApple OSS Distributions self.connection.setblocking(1) 53*8d741a5dSApple OSS Distributions self.isblocking = True 54*8d741a5dSApple OSS Distributions return self.connection.send(str.encode()) 55*8d741a5dSApple OSS Distributions 56*8d741a5dSApple OSS Distributions def close(self): 57*8d741a5dSApple OSS Distributions if self.connection: 58*8d741a5dSApple OSS Distributions logging.debug('closing connection.') 59*8d741a5dSApple OSS Distributions self.connection.close() 60*8d741a5dSApple OSS Distributions return self.socket 61*8d741a5dSApple OSS Distributions 62*8d741a5dSApple OSS Distributions def __str__(self): 63*8d741a5dSApple OSS Distributions return "interface: %s %d" % (self.host_cfg, self.portnum) 64