コード例 #1
0
ファイル: dispynetrelay.py プロジェクト: wsfax/dispy
    def listen_udp_proc(self, addrinfo, task=None):
        task.set_daemon()

        if addrinfo.family == socket.AF_INET6:
            mreq = socket.inet_pton(addrinfo.family, addrinfo.broadcast)
            mreq += struct.pack('@I', addrinfo.ifn)

        bc_sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_DGRAM))
        if addrinfo.family == socket.AF_INET:
            bc_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        else: # addrinfo.family == socket.AF_INET6
            bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS,
                               struct.pack('@i', 1))
            bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF, addrinfo.ifn)
        bc_sock.bind((addrinfo.ip, 0))
        if self.scheduler_ip_addrs and self.scheduler_port:
            relay_request = {'ip_addrs': self.scheduler_ip_addrs, 'port': self.scheduler_port,
                             'version': __version__, 'sign': None}
            bc_sock.sendto('PING:'.encode() + serialize(relay_request),
                           (self._broadcast, self.node_port))

        listen_sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_DGRAM))
        if addrinfo.family == socket.AF_INET:
            listen_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        else: # addrinfo.family == socket.AF_INET6
            listen_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)
        listen_sock.bind((addrinfo.ip, self.listen_port))

        while 1:
            msg, addr = yield listen_sock.recvfrom(1024)
            if not msg.startswith('PING:'.encode()):
                logger.debug('Ignoring message "%s" from %s',
                             msg[:min(len(msg), 5)], addr[0])
                continue
            logger.debug('Ping message from %s (%s)', addr[0], addr[1])
            try:
                info = deserialize(msg[len('PING:'.encode()):])
                if info['version'] != __version__:
                    logger.warning('Ignoring %s due to version mismatch: %s / %s',
                                   info['ip_addrs'], info['version'], __version__)
                    continue
                self.scheduler_ip_addrs = info['ip_addrs'] + [addr[0]]
                self.scheduler_port = info['port']
            except:
                logger.debug('Ignoring ping message from %s (%s)', addr[0], addr[1])
                logger.debug(traceback.format_exc())
                continue
            if info.get('relay', None):
                logger.debug('Ignoring ping back (from %s)', addr[0])
                continue
            logger.debug('relaying ping from %s / %s', info['ip_addrs'], addr[0])
            if self.node_port == self.listen_port:
                info['relay'] = 'y'  # 'check if this message loops back to self

            yield bc_sock.sendto('PING:'.encode() + serialize(info), addr)
コード例 #2
0
ファイル: dispynetrelay.py プロジェクト: ian2009/dispy
    def verify_broadcast(self, addrinfo, msg, task=None):
        if msg.get('relay', None):
            raise StopIteration
        msg['relay'] = 'y'
        # TODO: check if current scheduler is done with nodes?
        if msg['sign']:
            msg['auth'] = dispy.auth_code(self.secret, msg['sign'])
        reply = None
        for scheduler_ip_addr in msg['ip_addrs']:
            msg['scheduler_ip_addr'] = scheduler_ip_addr
            sock = AsyncSocket(socket.socket(addrinfo.family,
                                             socket.SOCK_STREAM),
                               keyfile=self.keyfile,
                               certfile=self.certfile)
            sock.settimeout(dispy.MsgTimeout)
            try:
                yield sock.connect((scheduler_ip_addr, msg['port']))
                yield sock.send_msg('RELAY_INFO:'.encode() + serialize(msg))
                reply = yield sock.recv_msg()
                reply = deserialize(reply)
            except:
                continue
            else:
                break
            finally:
                sock.close()

        if not reply:
            raise StopIteration

        # TODO: since dispynetrelay is not aware of computations closing, if
        # more than one client sends ping, nodes will respond to different
        # clients
        self.scheduler_ip_addr = reply['ip_addrs'] = [scheduler_ip_addr]
        self.scheduler_port = reply['port']
        bc_sock = AsyncSocket(socket.socket(addrinfo.family,
                                            socket.SOCK_DGRAM))
        ttl_bin = struct.pack('@i', 1)
        if addrinfo.family == socket.AF_INET:
            if self.ipv4_udp_multicast:
                bc_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL,
                                   ttl_bin)
            else:
                bc_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        else:  # addrinfo.family == socket.AF_INET6
            bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS,
                               ttl_bin)
            bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF,
                               addrinfo.ifn)
        bc_sock.bind((addrinfo.ip, 0))
        yield bc_sock.sendto('PING:'.encode() + serialize(msg),
                             (addrinfo.broadcast, self.node_port))
        bc_sock.close()
コード例 #3
0
ファイル: dispynetrelay.py プロジェクト: wsfax/dispy
 def tcp_req(conn, addr, task=None):
     conn.settimeout(5)
     try:
         msg = yield conn.recvall(auth_len)
         msg = yield conn.recv_msg()
     except:
         logger.debug(traceback.format_exc())
         logger.debug('Ignoring invalid TCP message from %s:%s', addr[0], addr[1])
         raise StopIteration
     finally:
         conn.close()
     logger.debug('Ping message from %s (%s)', addr[0], addr[1])
     try:
         info = deserialize(msg[len('PING:'.encode()):])
         if info['version'] != __version__:
             logger.warning('Ignoring %s due to version mismatch: %s / %s',
                            info['ip_addrs'], info['version'], __version__)
             raise StopIteration
         # TODO: since dispynetrelay is not aware of computations
         # closing, if more than one client sends ping, nodes will
         # respond to different clients
         self.scheduler_ip_addrs = info['ip_addrs'] + [addr[0]]
         self.scheduler_port = info['port']
     except:
         logger.debug('Ignoring ping message from %s (%s)', addr[0], addr[1])
         logger.debug(traceback.format_exc())
         raise StopIteration
     if info.get('relay', None):
         logger.debug('Ignoring ping back (from %s)', addr[0])
         raise StopIteration
     logger.debug('relaying ping from %s / %s', info['ip_addrs'], addr[0])
     if self.node_port == self.listen_port:
         info['relay'] = 'y'  # 'check if this message loops back to self
     yield bc_sock.sendto('PING:'.encode() + serialize(info),
                          (self._broadcast, self.node_port))
コード例 #4
0
 def discover_nodes(self, task=None):
     addrinfos = list(self.addrinfos.values())
     for addrinfo in addrinfos:
         info_msg = {
             'ip_addr': addrinfo.ip,
             'port': self.info_port,
             'sign': self.sign,
             'version': _dispy_version
         }
         bc_sock = AsyncSocket(
             socket.socket(addrinfo.family, socket.SOCK_DGRAM))
         bc_sock.settimeout(MsgTimeout)
         ttl_bin = struct.pack('@i', 1)
         if addrinfo.family == socket.AF_INET:
             if self.ipv4_udp_multicast:
                 bc_sock.setsockopt(socket.IPPROTO_IP,
                                    socket.IP_MULTICAST_TTL, ttl_bin)
             else:
                 bc_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST,
                                    1)
         else:  # addrinfo.family == socket.AF_INET6
             bc_sock.setsockopt(socket.IPPROTO_IPV6,
                                socket.IPV6_MULTICAST_HOPS, ttl_bin)
             bc_sock.setsockopt(socket.IPPROTO_IPV6,
                                socket.IPV6_MULTICAST_IF, addrinfo.ifn)
         bc_sock.bind((addrinfo.ip, 0))
         try:
             yield bc_sock.sendto(b'NODE_INFO:' + serialize(info_msg),
                                  (addrinfo.broadcast, self.node_port))
         except Exception:
             pass
         bc_sock.close()
コード例 #5
0
 def service_time(self, host, control, time, task=None):
     node = self.nodes.get(dispy._node_ipaddr(host), None)
     if not node or not node._priv.auth:
         raise StopIteration(-1)
     sock = AsyncSocket(socket.socket(node._priv.sock_family,
                                      socket.SOCK_STREAM),
                        keyfile=self.keyfile,
                        certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(node._priv.auth)
         yield sock.send_msg('SERVICE_TIME:'.encode() +
                             serialize({
                                 'control': control,
                                 'time': time
                             }))
         resp = yield sock.recv_msg()
         info = deserialize(resp)
         node.service_start = info['service_start']
         node.service_stop = info['service_stop']
         node.service_end = info['service_end']
         resp = 0
     except Exception:
         resp = -1
     sock.close()
     if resp:
         dispy.logger.debug('Setting service %s time of %s to %s failed',
                            control, host, time)
     raise StopIteration(resp)
コード例 #6
0
 def serve_clients(self, host, serve, task=None):
     node = self.nodes.get(dispy._node_ipaddr(host), None)
     if not node or not node._priv.auth:
         raise StopIteration(-1)
     sock = AsyncSocket(socket.socket(node._priv.sock_family,
                                      socket.SOCK_STREAM),
                        keyfile=self.keyfile,
                        certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(node._priv.auth)
         yield sock.send_msg('SERVE_CLIENTS:'.encode() +
                             serialize({'serve': serve}))
         resp = yield sock.recv_msg()
         info = deserialize(resp)
         node.serve = info['serve']
         resp = 0
     except Exception:
         dispy.logger.debug('Setting serve clients %s to %s failed', host,
                            serve)
         resp = -1
     finally:
         sock.close()
     raise StopIteration(resp)
コード例 #7
0
ファイル: dispynetrelay.py プロジェクト: pgiri/dispy
    def verify_broadcast(self, addrinfo, msg, task=None):
        if msg.get('relay', None):
            raise StopIteration
        msg['relay'] = 'y'
        # TODO: check if current scheduler is done with nodes?
        if msg['sign']:
            msg['auth'] = dispy.auth_code(self.secret, msg['sign'])
        reply = None
        for scheduler_ip_addr in msg['ip_addrs']:
            msg['scheduler_ip_addr'] = scheduler_ip_addr
            sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_STREAM),
                               keyfile=self.keyfile, certfile=self.certfile)
            sock.settimeout(dispy.MsgTimeout)
            try:
                yield sock.connect((scheduler_ip_addr, msg['port']))
                yield sock.send_msg('RELAY_INFO:'.encode() + serialize(msg))
                reply = yield sock.recv_msg()
                reply = deserialize(reply)
            except Exception:
                continue
            else:
                break
            finally:
                sock.close()

        if not reply:
            raise StopIteration

        # TODO: since dispynetrelay is not aware of computations closing, if
        # more than one client sends ping, nodes will respond to different
        # clients
        self.scheduler_ip_addr = reply['ip_addrs'] = [scheduler_ip_addr]
        self.scheduler_port = reply['port']
        bc_sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_DGRAM))
        ttl_bin = struct.pack('@i', 1)
        if addrinfo.family == socket.AF_INET:
            if self.ipv4_udp_multicast:
                bc_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl_bin)
            else:
                bc_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        else:  # addrinfo.family == socket.AF_INET6
            bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl_bin)
            bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF, addrinfo.ifn)
        bc_sock.bind((addrinfo.ip, 0))
        yield bc_sock.sendto('PING:'.encode() + serialize(msg),
                             (addrinfo.broadcast, self.node_port))
        bc_sock.close()
コード例 #8
0
ファイル: dispynetrelay.py プロジェクト: pgiri/dispy
 def relay_msg(msg, task=None):
     relay = {'ip_addrs': self.scheduler_ip_addr, 'port': self.scheduler_port,
              'version': __version__}
     relay['relay'] = 'y'
     sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(dispy.MsgTimeout)
     yield sock.connect((msg['ip_addr'], msg['port']))
     yield sock.sendall(dispy.auth_code(self.secret, msg['sign']))
     yield sock.send_msg('PING:'.encode() + serialize(relay))
     sock.close()
コード例 #9
0
ファイル: dispynetrelay.py プロジェクト: ian2009/dispy
 def relay_msg(msg, task=None):
     relay = {'ip_addrs': self.scheduler_ip_addr, 'port': self.scheduler_port,
              'version': __version__}
     relay['relay'] = 'y'
     sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(dispy.MsgTimeout)
     yield sock.connect((msg['ip_addr'], msg['port']))
     yield sock.sendall(dispy.auth_code(self.secret, msg['sign']))
     yield sock.send_msg('PING:'.encode() + serialize(relay))
     sock.close()
コード例 #10
0
    def sched_udp_proc(self, addrinfo, task=None):
        task.set_daemon()

        sched_sock = AsyncSocket(
            socket.socket(addrinfo.family, socket.SOCK_DGRAM))
        if addrinfo.family == socket.AF_INET:
            sched_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        else:  # addrinfo.family == socket.AF_INET6
            mreq = socket.inet_pton(addrinfo.family, addrinfo.broadcast)
            mreq += struct.pack('@I', addrinfo.ifn)
            sched_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP,
                                  mreq)

        sched_sock.bind((addrinfo.ip, self.scheduler_port))

        while 1:
            msg, addr = yield sched_sock.recvfrom(1024)
            if (not msg.startswith('PING:'.encode())
                    or not self.scheduler_ip_addrs or not self.scheduler_port):
                logger.debug('Ignoring ping message from %s (%s)', addr[0],
                             addr[1])
                continue
            try:
                info = deserialize(msg[len('PING:'.encode()):])
                assert info['version'] == __version__
                # assert isinstance(info['cpus'], int)
            except:
                logger.debug(traceback.format_exc())
            msg = {
                'ip_addrs': self.scheduler_ip_addrs,
                'port': self.scheduler_port,
                'version': __version__
            }
            if info.get('relay', None):
                logger.debug('Ignoring ping back from %s: %s', addr[0], info)
                continue
            msg['relay'] = 'y'
            relay_sock = AsyncSocket(
                socket.socket(addrinfo.family, socket.SOCK_DGRAM))
            relay_sock.bind((addrinfo.ip, 0))
            yield relay_sock.sendto('PING:'.encode() + serialize(msg),
                                    (info['ip_addr'], info['port']))
            relay_sock.close()
コード例 #11
0
ファイル: dispyadmin.py プロジェクト: zzygyx9119/dispy
 def set_cpus(self, host, cpus, task=None):
     node = self.nodes.get(host, None)
     if not node or not node._priv.auth:
         raise StopIteration(-1)
     sock = AsyncSocket(socket.socket(node._priv.sock_family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(node._priv.auth)
         yield sock.send_msg('SET_CPUS:'.encode() + serialize({'cpus': cpus}))
         resp = yield sock.recv_msg()
         info = deserialize(resp)
         node.cpus = info['cpus']
     except Exception:
         dispy.logger.debug('Setting cpus of %s to %s failed', host, cpus)
         raise StopIteration(-1)
     else:
         raise StopIteration(0)
     finally:
         sock.close()
コード例 #12
0
ファイル: dispyadmin.py プロジェクト: pgiri/dispy
 def serve_clients(self, host, serve, task=None):
     node = self.nodes.get(dispy._node_ipaddr(host), None)
     if not node or not node._priv.auth:
         raise StopIteration(-1)
     sock = AsyncSocket(socket.socket(node._priv.sock_family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(node._priv.auth)
         yield sock.send_msg('SERVE_CLIENTS:' + serialize({'serve': serve}))
         resp = yield sock.recv_msg()
         info = deserialize(resp)
         node.serve = info['serve']
         resp = 0
     except Exception:
         dispy.logger.debug('Setting serve %s to %s failed', host, serve)
         resp = -1
     finally:
         sock.close()
     raise StopIteration(resp)
コード例 #13
0
ファイル: dispyadmin.py プロジェクト: pgiri/dispy
 def set_cpus(self, host, cpus, task=None):
     node = self.nodes.get(host, None)
     if not node or not node._priv.auth:
         raise StopIteration(-1)
     sock = AsyncSocket(socket.socket(node._priv.sock_family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(node._priv.auth)
         yield sock.send_msg('SET_CPUS:' + serialize({'cpus': cpus}))
         resp = yield sock.recv_msg()
         info = deserialize(resp)
         node.cpus = info['cpus']
     except Exception:
         dispy.logger.debug('Setting cpus of %s to %s failed', host, cpus)
         raise StopIteration(-1)
     else:
         raise StopIteration(0)
     finally:
         sock.close()
コード例 #14
0
 def get_node_info(self, node, task=None):
     auth = node._priv.auth
     if not auth:
         auth = dispy.auth_code(self.secret, node._priv.sign)
     sock = AsyncSocket(socket.socket(node._priv.sock_family,
                                      socket.SOCK_STREAM),
                        keyfile=self.keyfile,
                        certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(auth)
         yield sock.send_msg(b'NODE_INFO:' + serialize({'sign': self.sign}))
         info = yield sock.recv_msg()
     except Exception:
         dispy.logger.debug('Could not get node information from %s:%s',
                            node.ip_addr, node._priv.port)
         # dispy.logger.debug(traceback.format_exc())
         raise StopIteration(-1)
     finally:
         sock.close()
     try:
         info = deserialize(info)
         node.name = info['name']
         node.cpus = info['cpus']
         node.max_cpus = info['max_cpus']
     except Exception:
         sign = info.decode()
         if node._priv.sign == sign:
             node.update_time = time.time()
             raise StopIteration(0)
         else:
             node._priv.sign = sign
             ret = yield self.get_node_info(node, task=task)
             raise StopIteration(ret)
     else:
         node._priv.auth = auth
         self.set_node_info(node, info)
         raise StopIteration(0)
コード例 #15
0
ファイル: dispyadmin.py プロジェクト: pgiri/dispy
    def timer_proc(self, task=None):
        task.set_daemon()

        last_ping = 0
        addrinfos = list(self.addrinfos.values())
        while 1:
            yield task.sleep(self.poll_interval)
            now = time.time()
            with self.lock:
                nodes = list(self.nodes.values())
            # TODO: it may be better to have nodes send updates periodically
            for node in nodes:
                if node._priv.auth:
                    Task(self.update_node_info, node)
            if (now - last_ping) >= self.ping_interval:
                last_ping = now
                for addrinfo in addrinfos:
                    info_msg = {'ip_addr': addrinfo.ip, 'port': self.info_port,
                                'sign': self.sign, 'version': _dispy_version}
                    bc_sock = AsyncSocket(socket.socket(addrinfo.family, socket.SOCK_DGRAM))
                    bc_sock.settimeout(MsgTimeout)
                    ttl_bin = struct.pack('@i', 1)
                    if addrinfo.family == socket.AF_INET:
                        if self.ipv4_udp_multicast:
                            bc_sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl_bin)
                        else:
                            bc_sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
                    else:  # addrinfo.family == socket.AF_INET6
                        bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl_bin)
                        bc_sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_IF,
                                           addrinfo.ifn)
                    bc_sock.bind((addrinfo.ip, 0))
                    try:
                        yield bc_sock.sendto('NODE_INFO:' + serialize(info_msg),
                                             (addrinfo.broadcast, self.node_port))
                    except Exception:
                        pass
                    bc_sock.close()
コード例 #16
0
ファイル: dispyadmin.py プロジェクト: pgiri/dispy
 def service_time(self, host, control, time, task=None):
     node = self.nodes.get(dispy._node_ipaddr(host), None)
     if not node or not node._priv.auth:
         raise StopIteration(-1)
     sock = AsyncSocket(socket.socket(node._priv.sock_family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(node._priv.auth)
         yield sock.send_msg('SERVICE_TIME:' + serialize({'control': control, 'time': time}))
         resp = yield sock.recv_msg()
         info = deserialize(resp)
         node.service_start = info['service_start']
         node.service_stop = info['service_stop']
         node.service_end = info['service_end']
         resp = 0
     except Exception:
         resp = -1
     sock.close()
     if resp:
         dispy.logger.debug('Setting service %s time of %s to %s failed', control, host, time)
     raise StopIteration(resp)
コード例 #17
0
ファイル: dispyadmin.py プロジェクト: pgiri/dispy
 def get_node_info(self, node, task=None):
     auth = node._priv.auth
     if not auth:
         auth = dispy.auth_code(self.secret, node._priv.sign)
     sock = AsyncSocket(socket.socket(node._priv.sock_family, socket.SOCK_STREAM),
                        keyfile=self.keyfile, certfile=self.certfile)
     sock.settimeout(MsgTimeout)
     try:
         yield sock.connect((node.ip_addr, node._priv.port))
         yield sock.sendall(auth)
         yield sock.send_msg('NODE_INFO:' + serialize({'sign': self.sign}))
         info = yield sock.recv_msg()
     except Exception:
         dispy.logger.debug('Could not get node information from %s:%s',
                            node.ip_addr, node._priv.port)
         # dispy.logger.debug(traceback.format_exc())
         raise StopIteration(-1)
     finally:
         sock.close()
     try:
         info = deserialize(info)
         node.name = info['name']
         node.cpus = info['cpus']
         node.max_cpus = info['max_cpus']
     except Exception:
         sign  = info.decode()
         if node._priv.sign == sign:
             node.update_time = time.time()
             raise StopIteration(0)
         else:
             node._priv.sign = sign
             raise StopIteration(yield self.get_node_info(node, task=task))
     else:
         node._priv.auth = auth
         self.set_node_info(node, info)
         raise StopIteration(0)
コード例 #18
0
 cnn = dbConnection.Cnn('gnss_data.cfg')
 GamitConfig = pyGamitConfig.GamitConfiguration('CPC-Ar_session.cfg')
 archive = pyArchiveStruct.RinexStruct(cnn)
 import pycos
 import pyDate
 dr = [pyDate.Date(year=2010, doy=1), pyDate.Date(year=2010, doy=2)]
 s1 = Station(cnn, 'rms', 'igm1', dr)
 s2 = Station(cnn, 'rms', 'lpgs', dr)
 s3 = Station(cnn, 'rms', 'chac', dr)
 s4 = Station(cnn, 'cap', 'chac', dr)
 si = StationInstance(cnn, archive, s1, dr[0], GamitConfig)
 gs = pyGamitSession.GamitSession(cnn, archive, 'igg', 'IGN', None,
                                  pyDate.Date(year=2020, doy=100),
                                  GamitConfig, [s1, s2, s3])
 c = StationCollection()
 a = pycos.unserialize(pycos.serialize(gs))
 print(a)
 b = pycos.unserialize(pycos.serialize(s1))
 print(b)
 c.append(s1)
 c.append(s2)
 c.append(s3)
 c = pycos.unserialize(pycos.serialize(c))
 print(c)
 # c.append(s4)
 # print c
 # c.replace_alias([s1, s2], ['zzz1', 'zzz1'])
 # print c
 # print c.get_active_stations(dr[0]).ismember(s3)
 # for i, s in enumerate(c):
 #     print i, s