class Server(object):
"""
High level Server class
This class creates an opcua server with default values
Create your own namespace and then populate your server address space
using use the get_root() or get_objects() to get Node objects.
and get_event_object() to fire events.
Then start server. See example_server.py
All methods are threadsafe
If you need more flexibility you call directly the Ua Service methods
on the iserver or iserver.isesssion object members.
During startup the standard address space will be constructed, which may be
time-consuming when running a server on a less powerful device (e.g. a
Raspberry Pi). In order to improve startup performance, a optional path to a
cache file can be passed to the server constructor.
If the parameter is defined, the address space will be loaded from the
cache file or the file will be created if it does not exist yet.
As a result the first startup will be even slower due to the cache file
generation but all further startups will be significantly faster.
:ivar application_uri:
:vartype application_uri: uri
:ivar product_uri:
:vartype product_uri: uri
:ivar name:
:vartype name: string
:ivar default_timeout: timout in milliseconds for sessions and secure channel
:vartype default_timeout: int
:ivar iserver: internal server object
:vartype default_timeout: InternalServer
:ivar bserver: binary protocol server
:vartype bserver: BinaryServer
"""
def __init__(self, cacheFile = None):
self.logger = logging.getLogger(__name__)
self.endpoint = urlparse("opc.tcp://0.0.0.0:4840/freeopcua/server/")
self.application_uri = "urn:freeopcua:python:server"
self.product_uri = "urn:freeopcua.github.no:python:server"
self.name = "FreeOpcUa Python Server"
self.application_type = ua.ApplicationType.ClientAndServer
self.default_timeout = 3600000
self.iserver = InternalServer(cacheFile)
self.bserver = None
self._discovery_clients = {}
self._discovery_period = 60
self.certificate = None
self.private_key = None
self._policies = []
# setup some expected values
self.register_namespace(self.application_uri)
sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray))
sa_node.set_value([self.application_uri])
def __enter__(self):
self.start()
return self
def __exit__(self):
self.stop()
def load_certificate(self, path):
"""
load server certificate from file, either pem or der
"""
self.certificate = uacrypto.load_certificate(path)
def load_private_key(self, path):
self.private_key = uacrypto.load_private_key(path)
def disable_clock(self, val=True):
"""
for debugging you may want to disable clock that write every second
to address space
"""
self.iserver.disabled_clock = val
def set_application_uri(self, uri):
"""
Set application/server URI.
This uri is supposed to be unique. If you intent to register
your server to a discovery server, it really should be unique in
your system!
default is : "urn:freeopcua:python:server"
"""
self.application_uri = uri
def find_servers(self, uris=None):
"""
find_servers. mainly implemented for simmetry with client
"""
if uris is None:
uris = []
params = ua.FindServersParameters()
params.EndpointUrl = self.endpoint.geturl()
params.ServerUris = uris
return self.iserver.find_servers(params)
def register_to_discovery(self, url="opc.tcp://localhost:4840", period=60):
"""
Register to an OPC-UA Discovery server. Registering must be renewed at
least every 10 minutes, so this method will use our asyncio thread to
re-register every period seconds
if period is 0 registration is not automatically renewed
"""
# FIXME: habe a period per discovery
if url in self._discovery_clients:
self._discovery_clients[url].disconnect()
self._discovery_clients[url] = Client(url)
self._discovery_clients[url].connect()
self._discovery_clients[url].register_server(self)
self._discovery_period = period
if period:
self.iserver.loop.call_soon(self._renew_registration)
def unregister_to_discovery(self, url="opc.tcp://localhost:4840"):
"""
stop registration thread
"""
# FIXME: is there really no way to deregister?
self._discovery_clients[url].disconnect()
def _renew_registration(self):
for client in self._discovery_clients.values():
client.register_server(self)
self.iserver.loop.call_later(self._discovery_period, self._renew_registration)
def get_client_to_discovery(self, url="opc.tcp://localhost:4840"):
"""
Create a client to discovery server and return it
"""
client = Client(url)
client.connect()
return client
def allow_remote_admin(self, allow):
"""
Enable or disable the builtin Admin user from network clients
"""
self.iserver.allow_remote_admin = allow
def set_endpoint(self, url):
self.endpoint = urlparse(url)
def get_endpoints(self):
return self.iserver.get_endpoints()
def _setup_server_nodes(self):
# to be called just before starting server since it needs all parameters to be setup
self._set_endpoints()
self._policies = [ua.SecurityPolicyFactory()]
if self.certificate and self.private_key:
self._set_endpoints(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.SignAndEncrypt)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.SignAndEncrypt,
self.certificate,
self.private_key)
)
self._set_endpoints(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.Sign)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.Sign,
self.certificate,
self.private_key)
)
self._set_endpoints(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.SignAndEncrypt)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.SignAndEncrypt,
self.certificate,
self.private_key)
)
self._set_endpoints(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.Sign)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.Sign,
self.certificate,
self.private_key)
)
def _set_endpoints(self, policy=ua.SecurityPolicy, mode=ua.MessageSecurityMode.None_):
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'anonymous'
idtoken.TokenType = ua.UserTokenType.Anonymous
idtoken2 = ua.UserTokenPolicy()
idtoken2.PolicyId = 'certificate_basic256'
idtoken2.TokenType = ua.UserTokenType.Certificate
idtoken3 = ua.UserTokenPolicy()
idtoken3.PolicyId = 'certificate_basic128'
idtoken3.TokenType = ua.UserTokenType.Certificate
idtoken4 = ua.UserTokenPolicy()
idtoken4.PolicyId = 'username'
idtoken4.TokenType = ua.UserTokenType.UserName
appdesc = ua.ApplicationDescription()
appdesc.ApplicationName = ua.LocalizedText(self.name)
appdesc.ApplicationUri = self.application_uri
appdesc.ApplicationType = self.application_type
appdesc.ProductUri = self.product_uri
appdesc.DiscoveryUrls.append(self.endpoint.geturl())
edp = ua.EndpointDescription()
edp.EndpointUrl = self.endpoint.geturl()
edp.Server = appdesc
if self.certificate:
edp.ServerCertificate = uacrypto.der_from_x509(self.certificate)
edp.SecurityMode = mode
edp.SecurityPolicyUri = policy.URI
edp.UserIdentityTokens = [idtoken, idtoken2, idtoken3, idtoken4]
edp.TransportProfileUri = 'http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary'
edp.SecurityLevel = 0
self.iserver.add_endpoint(edp)
def set_server_name(self, name):
self.name = name
def start(self):
"""
Start to listen on network
"""
self._setup_server_nodes()
self.iserver.start()
self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port)
self.bserver.set_policies(self._policies)
self.bserver.start()
def stop(self):
"""
Stop server
"""
for client in self._discovery_clients.values():
client.disconnect()
self.bserver.stop()
self.iserver.stop()
def get_root_node(self):
"""
Get Root node of server. Returns a Node object.
"""
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.RootFolder))
def get_objects_node(self):
"""
Get Objects node of server. Returns a Node object.
"""
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.ObjectsFolder))
def get_server_node(self):
"""
Get Server node of server. Returns a Node object.
"""
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.Server))
def get_node(self, nodeid):
"""
Get a specific node using NodeId object or a string representing a NodeId
"""
return Node(self.iserver.isession, nodeid)
def create_subscription(self, period, handler):
"""
Create a subscription.
returns a Subscription object which allow
to subscribe to events or data on server
"""
params = ua.CreateSubscriptionParameters()
params.RequestedPublishingInterval = period
params.RequestedLifetimeCount = 3000
params.RequestedMaxKeepAliveCount = 10000
params.MaxNotificationsPerPublish = 0
params.PublishingEnabled = True
params.Priority = 0
return Subscription(self.iserver.isession, params, handler)
def get_namespace_array(self):
"""
get all namespace defined in server
"""
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
return ns_node.get_value()
def register_namespace(self, uri):
"""
Register a new namespace. Nodes should in custom namespace, not 0.
"""
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
uries = ns_node.get_value()
uries.append(uri)
ns_node.set_value(uries)
return len(uries) - 1
def get_namespace_index(self, uri):
"""
get index of a namespace using its uri
"""
uries = self.get_namespace_array()
return uries.index(uri)
def get_event_generator(self, etype=None, source=ua.ObjectIds.Server):
"""
Returns an event object using an event type from address space.
Use this object to fire events
"""
if not etype:
etype = ua.BaseEvent()
return EventGenerator(self.iserver.isession, etype, source)
def create_custom_event_type(self, idx, name, baseetype=ua.ObjectIds.BaseEventType, properties=[]):
if isinstance(baseetype, Node):
base_event = baseetype
elif isinstance(baseetype, ua.NodeId):
base_event = Node(self.iserver.isession, baseetype)
else:
base_event = Node(self.iserver.isession, ua.NodeId(baseetype))
custom_event = base_event.add_subtype(idx, name)
for property in properties:
custom_event.add_property(idx, property[0], ua.Variant(None, property[1]))
return custom_event
def import_xml(self, path):
"""
import nodes defined in xml
"""
importer = xmlimporter.XmlImporter(self.iserver.node_mgt_service)
importer.import_xml(path)
def delete_nodes(self, nodes, recursive=False):
return delete_nodes(self.iserver.isession, nodes, recursive)
def historize_node(self, node):
self.iserver.enable_history(node)
def dehistorize_node(self, node):
self.iserver.disable_history(node)
class Server(object):
"""
High level Server class
This class creates an opcua server with default values
Create your own namespace and then populate your server address space
using use the get_root() or get_objects() to get Node objects.
and get_event_object() to fire events.
Then start server. See example_server.py
All methods are threadsafe
If you need more flexibility you call directly the Ua Service methods
on the iserver or iserver.isesssion object members.
:ivar application_uri:
:vartype application_uri: uri
:ivar product_uri:
:vartype product_uri: uri
:ivar name:
:vartype name: string
:ivar default_timeout: timout in milliseconds for sessions and secure channel
:vartype default_timeout: int
:ivar iserver: internal server object
:vartype default_timeout: InternalServer
:ivar bserver: binary protocol server
:vartype bserver: BinaryServer
"""
def __init__(self):
self.logger = logging.getLogger(__name__)
self.endpoint = urlparse("opc.tcp://0.0.0.0:4840/freeopcua/server/")
self.application_uri = "urn:freeopcua:python:server"
self.product_uri = "urn:freeopcua.github.no:python:server"
self.name = "FreeOpcUa Python Server"
self.application_type = ua.ApplicationType.ClientAndServer
self.default_timeout = 3600000
self.iserver = InternalServer()
self.bserver = None
self._discovery_clients = {}
self._discovery_period = 60
self.certificate = None
self.private_key = None
self._policies = []
# setup some expected values
self.register_namespace(self.application_uri)
sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray))
sa_node.set_value([self.application_uri])
def load_certificate(self, path):
"""
load server certificate from file, either pem or der
"""
self.certificate = uacrypto.load_certificate(path)
def load_private_key(self, path):
self.private_key = uacrypto.load_private_key(path)
def disable_clock(self, val=True):
"""
for debugging you may want to disable clock that write every second
to address space
"""
self.iserver.disabled_clock = val
def set_application_uri(self, uri):
"""
Set application/server URI.
This uri is supposed to be unique. If you intent to register
your server to a discovery server, it really should be unique in
your system!
default is : "urn:freeopcua:python:server"
"""
self.application_uri = uri
def find_servers(self, uris=None):
"""
find_servers. mainly implemented for simmetry with client
"""
if uris is None:
uris = []
params = ua.FindServersParameters()
params.EndpointUrl = self.endpoint.geturl()
params.ServerUris = uris
return self.iserver.find_servers(params)
def register_to_discovery(self, url="opc.tcp://localhost:4840", period=60):
"""
Register to an OPC-UA Discovery server. Registering must be renewed at
least every 10 minutes, so this method will use our asyncio thread to
re-register every period seconds
if period is 0 registration is not automatically renewed
"""
# FIXME: habe a period per discovery
if url in self._discovery_clients:
self._discovery_clients[url].disconnect()
self._discovery_clients[url] = Client(url)
self._discovery_clients[url].connect()
self._discovery_clients[url].register_server(self)
self._discovery_period = period
if period:
self.iserver.loop.call_soon(self._renew_registration)
def unregister_to_discovery(self, url="opc.tcp://localhost:4840"):
"""
stop registration thread
"""
# FIXME: is there really no way to deregister?
self._discovery_clients[url].disconnect()
def _renew_registration(self):
for client in self._discovery_clients.values():
client.register_server(self)
self.iserver.loop.call_later(self._discovery_period, self._renew_registration)
def get_client_to_discovery(self, url="opc.tcp://localhost:4840"):
"""
Create a client to discovery server and return it
"""
client = Client(url)
client.connect()
return client
def allow_remote_admin(self, allow):
"""
Enable or disable the builtin Admin user from network clients
"""
self.iserver.allow_remote_admin = allow
def set_endpoint(self, url):
self.endpoint = urlparse(url)
def get_endpoints(self):
return self.iserver.get_endpoints()
def _setup_server_nodes(self):
# to be called just before starting server since it needs all parameters to be setup
self._set_endpoints()
self._policies = [ua.SecurityPolicyFactory()]
if self.certificate and self.private_key:
self._set_endpoints(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.SignAndEncrypt)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.SignAndEncrypt,
self.certificate,
self.private_key)
)
self._set_endpoints(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.Sign)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic128Rsa15,
ua.MessageSecurityMode.Sign,
self.certificate,
self.private_key)
)
self._set_endpoints(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.SignAndEncrypt)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.SignAndEncrypt,
self.certificate,
self.private_key)
)
self._set_endpoints(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.Sign)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256,
ua.MessageSecurityMode.Sign,
self.certificate,
self.private_key)
)
def _set_endpoints(self, policy=ua.SecurityPolicy, mode=ua.MessageSecurityMode.None_):
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'anonymous'
idtoken.TokenType = ua.UserTokenType.Anonymous
idtoken2 = ua.UserTokenPolicy()
idtoken2.PolicyId = 'certificate_basic256'
idtoken2.TokenType = ua.UserTokenType.Certificate
idtoken3 = ua.UserTokenPolicy()
idtoken3.PolicyId = 'certificate_basic128'
idtoken3.TokenType = ua.UserTokenType.Certificate
idtoken4 = ua.UserTokenPolicy()
idtoken4.PolicyId = 'username'
idtoken4.TokenType = ua.UserTokenType.UserName
appdesc = ua.ApplicationDescription()
appdesc.ApplicationName = ua.LocalizedText(self.name)
appdesc.ApplicationUri = self.application_uri
appdesc.ApplicationType = self.application_type
appdesc.ProductUri = self.product_uri
appdesc.DiscoveryUrls.append(self.endpoint.geturl())
edp = ua.EndpointDescription()
edp.EndpointUrl = self.endpoint.geturl()
edp.Server = appdesc
if self.certificate:
edp.ServerCertificate = uacrypto.der_from_x509(self.certificate)
edp.SecurityMode = mode
edp.SecurityPolicyUri = policy.URI
edp.UserIdentityTokens = [idtoken, idtoken2, idtoken3, idtoken4]
edp.TransportProfileUri = 'http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary'
edp.SecurityLevel = 0
self.iserver.add_endpoint(edp)
def set_server_name(self, name):
self.name = name
def start(self):
"""
Start to listen on network
"""
self._setup_server_nodes()
self.iserver.start()
self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port)
self.bserver.set_policies(self._policies)
self.bserver.start()
def stop(self):
"""
Stop server
"""
for client in self._discovery_clients.values():
client.disconnect()
self.bserver.stop()
self.iserver.stop()
def get_root_node(self):
"""
Get Root node of server. Returns a Node object.
"""
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.RootFolder))
def get_objects_node(self):
"""
Get Objects node of server. Returns a Node object.
"""
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.ObjectsFolder))
def get_server_node(self):
"""
Get Server node of server. Returns a Node object.
"""
return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.Server))
def get_node(self, nodeid):
"""
Get a specific node using NodeId object or a string representing a NodeId
"""
return Node(self.iserver.isession, nodeid)
def create_subscription(self, period, handler):
"""
Create a subscription.
returns a Subscription object which allow
to subscribe to events or data on server
"""
params = ua.CreateSubscriptionParameters()
params.RequestedPublishingInterval = period
params.RequestedLifetimeCount = 3000
params.RequestedMaxKeepAliveCount = 10000
params.MaxNotificationsPerPublish = 0
params.PublishingEnabled = True
params.Priority = 0
return Subscription(self.iserver.isession, params, handler)
def get_namespace_array(self):
"""
get all namespace defined in server
"""
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
return ns_node.get_value()
def register_namespace(self, uri):
"""
Register a new namespace. Nodes should in custom namespace, not 0.
"""
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
uries = ns_node.get_value()
uries.append(uri)
ns_node.set_value(uries)
return len(uries) - 1
def get_namespace_index(self, uri):
"""
get index of a namespace using its uri
"""
uries = self.get_namespace_array()
return uries.index(uri)
def get_event_object(self, etype=ua.ObjectIds.BaseEventType, source=ua.ObjectIds.Server):
"""
Returns an event object using an event type from address space.
Use this object to fire events
"""
return Event(self.iserver.isession, etype, source)
def import_xml(self, path):
"""
import nodes defined in xml
"""
importer = xmlimporter.XmlImporter(self.iserver.node_mgt_service)
importer.import_xml(path)
def delete_nodes(self, nodes, recursive=False):
return delete_nodes(self.iserver.isession, nodes, recursive)
def historize_node(self, node):
self.iserver.enable_history(node)
def dehistorize_node(self, node):
self.iserver.disable_history(node)
