def _initialize_slaves(self):
"""Sets up the slave contexts for the server"""
slaves = []
collection = self.cb_system.Collection(self.cb_auth, collectionName=self.cb_slaves)
query = Query()
if self.ip_address is not None:
self.log.debug("Querying ClearBlade based on ip_address: {}".format(self.ip_address))
query.equalTo(COL_PROXY_IP_ADDRESS, self.ip_address)
else:
self.log.debug("No ip_address found in ClearBlade, querying based on non-empty slave_id")
query.notEqualTo(COL_SLAVE_ID, '')
rows = collection.getItems(query)
self.log.debug("Found {} rows in ClearBlade adapter config".format(len(rows)))
for row in rows:
slave_id = int(row[COL_SLAVE_ID])
if slave_id not in slaves:
slaves.append(slave_id)
self[slave_id] = ClearBladeModbusProxySlaveContext(server_context=self, config=row, log=self.log)
else:
self.log.warning("Duplicate slave_id {} found in RTUs collection - only 1 RTU per server context"
.format(slave_id))
def run_async_server():
"""
The main loop instantiates one or more PyModbus servers mapped to ClearBlade Modbus proxies based on
IP address and port defined in a ClearBlade platform Collection
"""
log = None
virtual_ifs = []
err_msg = None
defer_reactor = False
try:
parser = get_parser()
user_options = parser.parse_args()
local_ip_address = user_options.ip_address
local_tcp_port = user_options.tcp_port
net_if = user_options.net_if
if user_options.log_level == 'DEBUG':
_debug = True
else:
_debug = False
HEARTBEAT = user_options.heartbeat
log = headless.get_wrapping_logger(name=ADAPTER_DEVICE_ID, debug=_debug)
server_log = headless.get_wrapping_logger(name="pymodbus.server", debug=_debug)
log.info("Initializing ClearBlade System connection")
cb_system = System(systemKey=user_options.systemKey, systemSecret=user_options.systemSecret, url=user_options.url)
cb_auth = cb_system.Device(name=user_options.deviceName, key=user_options.deviceKey)
cb_slave_config = user_options.slaves_collection
cb_data = user_options.data_collection
ip_proxies = []
proxy_ports = []
ip_address = None
collection = cb_system.Collection(cb_auth, collectionName=cb_slave_config)
query = Query()
query.notEqualTo(COL_PROXY_IP_ADDRESS, '')
rows = collection.getItems(query)
for row in rows:
# TODO: allow for possibility of multiple IPs with same port or same IP with multiple ports
ip_address = str(row[COL_PROXY_IP_ADDRESS])
tcp_port = int(row[COL_PROXY_IP_PORT])
if ip_address not in ip_proxies:
log.info("Found slave at {} on ClearBlade adapter config".format(ip_address))
ip_proxies.append(ip_address)
proxy_ports.append(tcp_port)
else:
log.warning("Duplicate proxy IP address {} found in configuration - ignoring".format(ip_address))
log.debug("Processing {} slaves".format(len(ip_proxies)))
for i in range(0, len(ip_proxies)):
log.debug("Getting server context for {}".format(ip_proxies[i]))
context = ClearBladeModbusProxyServerContext(cb_system=cb_system, cb_auth=cb_auth,
cb_slaves_config=cb_slave_config, cb_data=cb_data,
ip_address=ip_proxies[i], log=log)
# Create IP aliases
local_ip_address = ip_proxies[i]
ip_mask = '255.255.255.0'
local_tcp_port = proxy_ports[i]
if sys.platform.startswith('win'):
log.info("I'm on Windows!")
local_ip_address = 'localhost'
elif sys.platform.startswith('linux') or sys.platform.startswith('cygwin'):
virtual_if = '{nif}:{alias}'.format(nif=net_if, alias=i)
virtual_ifs.append(virtual_if)
linux_command = "ifconfig {vif} {ip}".format(vif=virtual_if, ip=local_ip_address)
if ip_mask is not None:
linux_command += " netmask {mask}".format(mask=ip_mask)
log.info("Creating virtual IP address / alias via $ {}".format(linux_command))
subprocess.call(linux_command, shell=True)
# Create Server Identification
identity = ModbusDeviceIdentification()
identity.VendorName = 'PyModbus'
identity.VendorUrl = 'http://github.com/bashwork/pymodbus/'
identity.ProductName = 'Inmarsat/ClearBlade Modbus Server Adapter'
identity.ModelName = ip_proxies[i]
identity.MajorMinorRevision = '1.0'
# Setup Modbus TCP Server
log.info("Starting Modbus TCP server on {}:{}".format(local_ip_address, local_tcp_port))
modbus_server_args = {
'context': context,
'identity': identity,
'address': (local_ip_address, local_tcp_port),
# 'console': _debug,
'defer_reactor_run': True,
}
if modbus_server_args['defer_reactor_run']:
defer_reactor = True
reactor.callInThread(StartTcpServer, **modbus_server_args)
if local_ip_address == 'localhost':
log.info("Windows retricted environment prevents IP alias - running localhost for {}"
.format(ip_proxies[i]))
break
reactor.callInThread(_heartbeat, log, time.time(), HEARTBEAT)
if defer_reactor:
reactor.suggestThreadPoolSize(len(ip_proxies))
reactor.run()
except KeyboardInterrupt:
err_msg = "modbus_server_adapter.py halted by Keyboard Interrupt"
if log is not None:
log.info(err_msg)
else:
print(err_msg)
sys.exit("modbus_server_adapter.py halted by Keyboard Interrupt")
except Exception as e:
err_msg = "EXCEPTION: {}".format(e)
if log is not None:
log.info(err_msg)
else:
print(err_msg)
sys.exit("modbus_server_adapter.py halted by exception {}".format(e))
finally:
if defer_reactor and reactor.running:
reactor.stop()
for vif in virtual_ifs:
debug_msg = "Taking down virtual interface {}".format(vif)
if log is not None:
log.debug(debug_msg)
else:
print(debug_msg)
linux_command = "ifconfig {} down".format(vif)
subprocess.call(linux_command, shell=True)
print("Exiting...")