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.isession 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 start ups will be significantly faster.
:ivar product_uri:
:vartype product_uri: uri
:ivar name:
:vartype name: string
:ivar default_timeout: timeout 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
:ivar nodes: shortcuts to common nodes
:vartype nodes: Shortcuts
"""
def __init__(self, shelffile=None, iserver=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
if iserver is not None:
self.iserver = iserver
else:
self.iserver = InternalServer(shelffile)
self.bserver = None
self._discovery_clients = {}
self._discovery_period = 60
self.certificate = None
self.private_key = None
self._policies = []
self.nodes = Shortcuts(self.iserver.isession)
# setup some expected values
self.set_application_uri(self._application_uri)
sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray))
sa_node.set_value([self._application_uri])
# enable all endpoints by default
self._security_policy = [#"None", "Basic128Rsa15_Sign",
# "Basic128Rsa15_SignAndEncrypt",
"Basic256_Sign", "Basic256_SignAndEncrypt"]
self._policyIDs = ["Anonymous", "Basic256", "Basic128", "Username"]
def __enter__(self):
self.start()
return self
def __exit__(self, exc_type, exc_value, traceback):
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
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
uries = ns_node.get_value()
if len(uries) > 1:
uries[1] = uri # application uri is always namespace 1
else:
uries.append(uri)
ns_node.set_value(uries)
def find_servers(self, uris=None):
"""
find_servers. mainly implemented for symmetry 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: have 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 set_security_policy(self, security_policy):
"""
Method setting up the security policies for connections
to the server. During server object initialization, all
possible endpoints are enabled:
security_policy = ["None",
"Basic128Rsa15_Sign",
"Basic128Rsa15_SignAndEncrypt",
"Basic256_Sign",
"Basic256_SignAndEncrypt"]
where security_policy is a list of strings. "None" enables an
endpoint without any security.
E.g. to limit the number of endpoints and disable no encryption:
set_security_policy(["Basic256_Sign",
"Basic256_SignAndEncrypt"])
"""
self._security_policy = security_policy
def set_security_IDs(self, policyIDs):
"""
Method setting up the security endpoints for identification
of clients. During server object initialization, all possible
endpoints are enabled:
self._policyIDs = ["Anonymous", "Basic256", "Basic128", "Username"]
E.g. to limit the number of IDs and disable anonymous clients:
set_security_policy(["Basic256"])
(Implementation for ID check is currently not finalized...)
"""
self._policyIDs = policyIDs
def _setup_server_nodes(self):
# to be called just before starting server since it needs all parameters to be setup
if "None" in self._security_policy:
self._set_endpoints()
self._policies = [ua.SecurityPolicyFactory()]
if (len(self._security_policy)>1) and self.private_key:
self.logger.warning("Creating an open endpoint to the server, although encrypted endpoints are enabled.")
if self.certificate and self.private_key:
if "Basic128Rsa15_SignAndEncrypt" in self._security_policy:
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)
)
if "Basic128Rsa15_Sign" in self._security_policy:
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)
)
if "Basic256_SignAndEncrypt" in self._security_policy:
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)
)
if "Basic256_Sign" in self._security_policy:
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_):
idtokens = []
if "Anonymous" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'anonymous'
idtoken.TokenType = ua.UserTokenType.Anonymous
idtokens.append(idtoken)
if "Basic256" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'certificate_basic256'
idtoken.TokenType = ua.UserTokenType.Certificate
idtokens.append(idtoken)
if "Basic128" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'certificate_basic128'
idtoken.TokenType = ua.UserTokenType.Certificate
idtokens.append(idtoken)
if "Username" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'username'
idtoken.TokenType = ua.UserTokenType.UserName
idtokens.append(idtoken)
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 = idtokens
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()
try:
self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port)
self.bserver.set_policies(self._policies)
self.bserver.start()
except Exception as exp:
self.iserver.stop()
raise exp
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()
if uri in uries:
return uries.index(uri)
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 = BaseEvent()
return EventGenerator(self.iserver.isession, etype, source)
def create_custom_data_type(self, idx, name, basetype=ua.ObjectIds.BaseDataType, properties=None):
if properties is None:
properties = []
return self._create_custom_type(idx, name, basetype, properties, [], [])
def create_custom_event_type(self, idx, name, basetype=ua.ObjectIds.BaseEventType, properties=None):
if properties is None:
properties = []
return self._create_custom_type(idx, name, basetype, properties, [], [])
def create_custom_object_type(self, idx, name, basetype=ua.ObjectIds.BaseObjectType, properties=None, variables=None, methods=None):
if properties is None:
properties = []
if variables is None:
variables = []
if methods is None:
methods = []
return self._create_custom_type(idx, name, basetype, properties, variables, methods)
# def create_custom_reference_type(self, idx, name, basetype=ua.ObjectIds.BaseReferenceType, properties=[]):
# return self._create_custom_type(idx, name, basetype, properties)
def create_custom_variable_type(self, idx, name, basetype=ua.ObjectIds.BaseVariableType, properties=None, variables=None, methods=None):
if properties is None:
properties = []
if variables is None:
variables = []
if methods is None:
methods = []
return self._create_custom_type(idx, name, basetype, properties, variables, methods)
def _create_custom_type(self, idx, name, basetype, properties, variables, methods):
if isinstance(basetype, Node):
base_t = basetype
elif isinstance(basetype, ua.NodeId):
base_t = Node(self.iserver.isession, basetype)
else:
base_t = Node(self.iserver.isession, ua.NodeId(basetype))
custom_t = base_t.add_object_type(idx, name)
for prop in properties:
datatype = None
if len(prop) > 2:
datatype = prop[2]
custom_t.add_property(idx, prop[0], ua.get_default_value(prop[1]), varianttype=prop[1], datatype=datatype)
for variable in variables:
datatype = None
if len(variable) > 2:
datatype = variable[2]
custom_t.add_variable(idx, variable[0], ua.get_default_value(variable[1]), varianttype=variable[1], datatype=datatype)
for method in methods:
custom_t.add_method(idx, method[0], method[1], method[2], method[3])
return custom_t
def import_xml(self, path):
"""
Import nodes defined in xml
"""
importer = XmlImporter(self)
return importer.import_xml(path)
def export_xml(self, nodes, path):
"""
Export defined nodes to xml
"""
exp = XmlExporter(self)
exp.build_etree(nodes)
return exp.write_xml(path)
def export_xml_by_ns(self, path, namespaces=None):
"""
Export nodes of one or more namespaces to an XML file.
Namespaces used by nodes are always exported for consistency.
Args:
server: opc ua server to use
path: name of the xml file to write
namespaces: list of string uris or int indexes of the namespace to export, if not provide all ns are used except 0
Returns:
"""
if namespaces is None:
namespaces = []
nodes = get_nodes_of_namespace(self, namespaces)
self.export_xml(nodes, path)
def delete_nodes(self, nodes, recursive=False):
return delete_nodes(self.iserver.isession, nodes, recursive)
def historize_node_data_change(self, node, period=timedelta(days=7), count=0):
"""
Start historizing supplied nodes; see history module
Args:
node: node or list of nodes that can be historized (variables/properties)
period: time delta to store the history; older data will be deleted from the storage
count: number of changes to store in the history
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.enable_history_data_change(node, period, count)
def dehistorize_node_data_change(self, node):
"""
Stop historizing supplied nodes; see history module
Args:
node: node or list of nodes that can be historized (UA variables/properties)
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.disable_history_data_change(node)
def historize_node_event(self, node, period=timedelta(days=7), count=0):
"""
Start historizing events from node (typically a UA object); see history module
Args:
node: node or list of nodes that can be historized (UA objects)
period: time delta to store the history; older data will be deleted from the storage
count: number of events to store in the history
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.enable_history_event(node, period, count)
def dehistorize_node_event(self, node):
"""
Stop historizing events from node (typically a UA object); see history module
Args:
node: node or list of nodes that can be historized (UA objects)
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.disable_history_event(node)
def subscribe_server_callback(self, event, handle):
self.iserver.subscribe_server_callback(event, handle)
def unsubscribe_server_callback(self, event, handle):
self.iserver.unsubscribe_server_callback(event, handle)
def link_method(self, node, callback):
"""
Link a python function to a UA method in the address space; required when a UA method has been imported
to the address space via XML; the python executable must be linked manually
Args:
node: UA method node
callback: python function that the UA method will call
Returns:
"""
self.iserver.isession.add_method_callback(node.nodeid, callback)
def load_type_definitions(self, nodes=None):
return load_type_definitions(self, nodes)
class Server(object):
"""
High level Server class
Create an opcua server with default values
The class is very short. Users are adviced to read the code.
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
: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://0.0.0.0:4841/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]
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)
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
:ivar nodes: shortcuts to common nodes
:vartype nodes: Shortcuts
"""
def __init__(self, cacheFile = None, iserver = 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
if iserver is not None :
self.iserver = iserver
else :
self.iserver = InternalServer(cacheFile)
self.bserver = None
self._discovery_clients = {}
self._discovery_period = 60
self.certificate = None
self.private_key = None
self._policies = []
self.nodes = Shortcuts(self.iserver.isession)
# 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, exc_type, exc_value, traceback):
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()
if uri in uries:
return uries.index(uri)
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 = BaseEvent()
return EventGenerator(self.iserver.isession, etype, source)
def create_custom_data_type(self, idx, name, basetype=ua.ObjectIds.BaseDataType, properties=[]):
return self._create_custom_type(idx, name, basetype, properties, [], [])
def create_custom_event_type(self, idx, name, basetype=ua.ObjectIds.BaseEventType, properties=[]):
return self._create_custom_type(idx, name, basetype, properties, [], [])
def create_custom_object_type(self, idx, name, basetype=ua.ObjectIds.BaseObjectType, properties=[], variables=[], methods=[]):
return self._create_custom_type(idx, name, basetype, properties, variables, methods)
#def create_custom_reference_type(self, idx, name, basetype=ua.ObjectIds.BaseReferenceType, properties=[]):
#return self._create_custom_type(idx, name, basetype, properties)
def create_custom_variable_type(self, idx, name, basetype=ua.ObjectIds.BaseVariableType, properties=[], variables=[], methods=[]):
return self._create_custom_type(idx, name, basetype, properties, variables, methods)
def _create_custom_type(self, idx, name, basetype, properties, variables, methods):
if isinstance(basetype, Node):
base_t = basetype
elif isinstance(basetype, ua.NodeId):
base_t = Node(self.iserver.isession, basetype)
else:
base_t = Node(self.iserver.isession, ua.NodeId(basetype))
custom_t = base_t.add_object_type(idx, name)
for property in properties:
datatype = None
if len(property) > 2:
datatype = property[2]
custom_t.add_property(idx, property[0], None, varianttype=property[1], datatype=datatype)
for variable in variables:
datatype = None
if len(variable) > 2:
datatype = variable[2]
custom_t.add_variable(idx, variable[0], None, varianttype=variable[1], datatype=datatype)
for method in methods:
custom_t.add_method(idx, method[0], method[1], method[2], method[3])
return custom_t
def import_xml(self, path):
"""
import nodes defined in xml
"""
importer = xmlimporter.XmlImporter(self.iserver.node_mgt_service)
importer.import_xml(path, self)
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)
def subscribe_server_callback(self, event, handle):
self.iserver.subscribe_server_callback(event, handle)
def unsubscribe_server_callback(self, event, handle):
self.iserver.unsubscribe_server_callback(event, handle)
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)
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.isession 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 start ups will be significantly faster.
:ivar product_uri:
:vartype product_uri: uri
:ivar name:
:vartype name: string
:ivar default_timeout: timeout 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
:ivar nodes: shortcuts to common nodes
:vartype nodes: Shortcuts
"""
def __init__(self, shelffile=None, iserver=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.io:python:server"
self.name = "FreeOpcUa Python Server"
self.manufacturer_name = "FreeOpcUa"
self.application_type = ua.ApplicationType.ClientAndServer
self.default_timeout = 3600000
if iserver is not None:
self.iserver = iserver
else:
self.iserver = InternalServer(shelffile = shelffile, parent = self)
self.bserver = None
self._policies = []
self.nodes = Shortcuts(self.iserver.isession)
# setup some expected values
self.set_application_uri(self._application_uri)
sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray))
sa_node.set_value([self._application_uri])
status_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerStatus))
build_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerStatus_BuildInfo))
status = ua.ServerStatusDataType()
status.BuildInfo.ProductUri = self.product_uri
status.BuildInfo.ManufacturerName = self.manufacturer_name
status.BuildInfo.ProductName = self.name
status.BuildInfo.SoftwareVersion = "1.0pre"
status.BuildInfo.BuildNumber = "0"
status.BuildInfo.BuildDate = datetime.now()
status.SecondsTillShutdown = 0
status_node.set_value(status)
build_node.set_value(status.BuildInfo)
# enable all endpoints by default
self.certificate = None
self.private_key = None
self.user_manager = UserManager(parent = self)
self._security_policy = [
ua.SecurityPolicyType.NoSecurity,
ua.SecurityPolicyType.Basic256Sha256_SignAndEncrypt,
ua.SecurityPolicyType.Basic256Sha256_Sign
]
self._policyIDs = ["Anonymous", "Basic256Sha256", "Username"]
def __enter__(self):
self.start()
return self
def __exit__(self, exc_type, exc_value, traceback):
self.stop()
@property
def local_discovery_service(self):
return self.iserver.local_discovery_service
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
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
uries = ns_node.get_value()
if len(uries) > 1:
uries[1] = uri # application uri is always namespace 1
else:
uries.append(uri)
ns_node.set_value(uries)
def find_servers(self, uris=None):
"""
find_servers. mainly implemented for symmetry with client
"""
if uris is None:
uris = []
params = ua.FindServersParameters()
params.EndpointUrl = self.endpoint.geturl()
params.ServerUris = uris
return self.local_discovery_service.find_servers(params)
def allow_remote_admin(self, allow):
"""
Enable or disable the builtin Admin user from network clients
"""
self.user_manager.allow_remote_admin = allow
def set_endpoint(self, url):
self.endpoint = urlparse(url)
def get_endpoints(self):
return self.iserver.get_endpoints()
def set_security_policy(self, security_policy):
"""
Method setting up the security policies for connections
to the server, where security_policy is a list of integers.
During server initialization, all endpoints are enabled:
security_policy = [
ua.SecurityPolicyType.NoSecurity,
ua.SecurityPolicyType.Basic256Sha256_SignAndEncrypt,
ua.SecurityPolicyType.Basic256Sha256_Sign
]
E.g. to limit the number of endpoints and disable no encryption:
set_security_policy([
ua.SecurityPolicyType.Basic256Sha256_SignAndEncrypt])
"""
self._security_policy = security_policy
def set_security_IDs(self, policyIDs):
"""
Method setting up the security endpoints for identification
of clients. During server object initialization, all possible
endpoints are enabled:
self._policyIDs = ["Anonymous", "Basic256Sha256", "Username"]
E.g. to limit the number of IDs and disable anonymous clients:
set_security_policy(["Basic256Sha256"])
(Implementation for ID check is currently not finalized...)
"""
self._policyIDs = policyIDs
def _setup_server_nodes(self):
# to be called just before starting server since it needs all parameters to be setup
if ua.SecurityPolicyType.NoSecurity in self._security_policy:
self._set_endpoints()
self._policies = [ua.SecurityPolicyFactory()]
if self._security_policy != [ua.SecurityPolicyType.NoSecurity]:
if not (self.certificate and self.private_key):
self.logger.warning("Endpoints other than open requested but private key and certificate are not set.")
return
if ua.SecurityPolicyType.NoSecurity in self._security_policy:
self.logger.warning("Creating an open endpoint to the server, although encrypted endpoints are enabled.")
if ua.SecurityPolicyType.Basic256Sha256_SignAndEncrypt in self._security_policy:
self._set_endpoints(security_policies.SecurityPolicyBasic256Sha256,
ua.MessageSecurityMode.SignAndEncrypt)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256Sha256,
ua.MessageSecurityMode.SignAndEncrypt,
self.certificate,
self.private_key)
)
if ua.SecurityPolicyType.Basic256Sha256_Sign in self._security_policy:
self._set_endpoints(security_policies.SecurityPolicyBasic256Sha256,
ua.MessageSecurityMode.Sign)
self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256Sha256,
ua.MessageSecurityMode.Sign,
self.certificate,
self.private_key)
)
def _set_endpoints(self, policy=ua.SecurityPolicy, mode=ua.MessageSecurityMode.None_):
idtokens = []
if "Anonymous" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'anonymous'
idtoken.TokenType = ua.UserTokenType.Anonymous
idtokens.append(idtoken)
if "Basic256Sha256" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'certificate_basic256sha256'
idtoken.TokenType = ua.UserTokenType.Certificate
idtokens.append(idtoken)
if "Username" in self._policyIDs:
idtoken = ua.UserTokenPolicy()
idtoken.PolicyId = 'username'
idtoken.TokenType = ua.UserTokenType.UserName
idtokens.append(idtoken)
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 = idtokens
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()
try:
if not self.bserver:
self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port)
self.bserver.set_policies(self._policies)
self.bserver.set_loop(self.iserver.loop)
self.bserver.start()
except Exception as exp:
self.iserver.stop()
raise exp
def stop(self):
"""
Stop server
"""
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
period is in milliseconds
handler is a python object with following methods:
def datachange_notification(self, node, val, data):
def event_notification(self, event):
def status_change_notification(self, status):
"""
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()
if uri in uries:
return uries.index(uri)
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, emitting_node=ua.ObjectIds.Server):
"""
Returns an event object using an event type from address space.
Use this object to fire events
"""
if not etype:
etype = BaseEvent()
return EventGenerator(self.iserver.isession, etype, emitting_node=emitting_node)
def create_custom_data_type(self, idx, name, basetype=ua.ObjectIds.BaseDataType, properties=None):
if properties is None:
properties = []
return self._create_custom_type(idx, name, basetype, properties, [], [])
def create_custom_event_type(self, idx, name, basetype=ua.ObjectIds.BaseEventType, properties=None):
if properties is None:
properties = []
return self._create_custom_type(idx, name, basetype, properties, [], [])
def create_custom_object_type(self, idx, name, basetype=ua.ObjectIds.BaseObjectType, properties=None, variables=None, methods=None):
if properties is None:
properties = []
if variables is None:
variables = []
if methods is None:
methods = []
return self._create_custom_type(idx, name, basetype, properties, variables, methods)
# def create_custom_reference_type(self, idx, name, basetype=ua.ObjectIds.BaseReferenceType, properties=[]):
# return self._create_custom_type(idx, name, basetype, properties)
def create_custom_variable_type(self, idx, name, basetype=ua.ObjectIds.BaseVariableType, properties=None, variables=None, methods=None):
if properties is None:
properties = []
if variables is None:
variables = []
if methods is None:
methods = []
return self._create_custom_type(idx, name, basetype, properties, variables, methods)
def _create_custom_type(self, idx, name, basetype, properties, variables, methods):
if isinstance(basetype, Node):
base_t = basetype
elif isinstance(basetype, ua.NodeId):
base_t = Node(self.iserver.isession, basetype)
else:
base_t = Node(self.iserver.isession, ua.NodeId(basetype))
custom_t = base_t.add_object_type(idx, name)
for prop in properties:
datatype = None
if len(prop) > 2:
datatype = prop[2]
custom_t.add_property(idx, prop[0], ua.get_default_value(prop[1]), varianttype=prop[1], datatype=datatype)
for variable in variables:
datatype = None
if len(variable) > 2:
datatype = variable[2]
custom_t.add_variable(idx, variable[0], ua.get_default_value(variable[1]), varianttype=variable[1], datatype=datatype)
for method in methods:
custom_t.add_method(idx, method[0], method[1], method[2], method[3])
return custom_t
def import_xml(self, path=None, xmlstring=None):
"""
Import nodes defined in xml
"""
importer = XmlImporter(self)
return importer.import_xml(path, xmlstring)
def export_xml(self, nodes, path):
"""
Export defined nodes to xml
"""
exp = XmlExporter(self)
exp.build_etree(nodes)
return exp.write_xml(path)
def export_xml_by_ns(self, path, namespaces=None):
"""
Export nodes of one or more namespaces to an XML file.
Namespaces used by nodes are always exported for consistency.
Args:
server: opc ua server to use
path: name of the xml file to write
namespaces: list of string uris or int indexes of the namespace to export, if not provide all ns are used except 0
Returns:
"""
if namespaces is None:
namespaces = []
nodes = get_nodes_of_namespace(self, namespaces)
self.export_xml(nodes, path)
def delete_nodes(self, nodes, recursive=False):
return delete_nodes(self.iserver.isession, nodes, recursive)
def historize_node_data_change(self, node, period=timedelta(days=7), count=0):
"""
Start historizing supplied nodes; see history module
Args:
node: node or list of nodes that can be historized (variables/properties)
period: time delta to store the history; older data will be deleted from the storage
count: number of changes to store in the history
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.enable_history_data_change(node, period, count)
def dehistorize_node_data_change(self, node):
"""
Stop historizing supplied nodes; see history module
Args:
node: node or list of nodes that can be historized (UA variables/properties)
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.disable_history_data_change(node)
def historize_node_event(self, node, period=timedelta(days=7), count=0):
"""
Start historizing events from node (typically a UA object); see history module
Args:
node: node or list of nodes that can be historized (UA objects)
period: time delta to store the history; older data will be deleted from the storage
count: number of events to store in the history
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.enable_history_event(node, period, count)
def dehistorize_node_event(self, node):
"""
Stop historizing events from node (typically a UA object); see history module
Args:
node: node or list of nodes that can be historized (UA objects)
Returns:
"""
nodes = node if isinstance(node, (list, tuple)) else [node]
for node in nodes:
self.iserver.disable_history_event(node)
def subscribe_server_callback(self, event, handle):
self.iserver.subscribe_server_callback(event, handle)
def unsubscribe_server_callback(self, event, handle):
self.iserver.unsubscribe_server_callback(event, handle)
def link_method(self, node, callback):
"""
Link a python function to a UA method in the address space; required when a UA method has been imported
to the address space via XML; the python executable must be linked manually
Args:
node: UA method node
callback: python function that the UA method will call
Returns:
"""
self.iserver.isession.add_method_callback(node.nodeid, callback)
def load_type_definitions(self, nodes=None):
"""
load custom structures from our server.
Server side this can be used to create python objects from custom structures
imported through xml into server
"""
return load_type_definitions(self, nodes)
def load_enums(self):
"""
load UA structures and generate python Enums in ua module for custom enums in server
"""
return load_enums(self)
def set_attribute_value(self, nodeid, datavalue, attr=ua.AttributeIds.Value):
"""
directly write datavalue to the Attribute, bypasing some checks and structure creation
so it is a little faster
"""
return self.iserver.set_attribute_value(nodeid, datavalue, attr)