Server.historize_node_data_change() - Code Metrics - Inspection of "Caching fixes (#353)" - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 6083f5...66575e )

by Olivier

created 2016-11-15 20:13 UTC

Server.historize_node_data_change() A

↳ Parent: Project

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Tests	4
CRAP Score	2

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Metric	Value
cc	2
dl	0
loc	13
ccs	4
cts	4
cp	1
crap	2
rs	9.4285
c	0
b	0
f	0

"""
High level interface to pure python OPC-UA server
"""

import logging
from datetime import timedelta
try:
    from urllib.parse import urlparse
except ImportError:
    from urlparse import urlparse


from opcua import ua
# from opcua.binary_server import BinaryServer
from opcua.server.binary_server_asyncio import BinaryServer
from opcua.server.internal_server import InternalServer
from opcua.server.event_generator import EventGenerator
from opcua.common.node import Node
from opcua.common.subscription import Subscription
from opcua.common import xmlimporter
from opcua.common.manage_nodes import delete_nodes
from opcua.client.client import Client
from opcua.crypto import security_policies
from opcua.common.event_objects import BaseEvent
from opcua.common.shortcuts import Shortcuts
from opcua.common.xmlexporter import XmlExporter
from opcua.common.ua_utils import get_nodes_of_namespace
use_crypto = True
try:
    from opcua.crypto import uacrypto
except ImportError:
    print("cryptography is not installed, use of crypto disabled")
    use_crypto = False


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 start ups 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: 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.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 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 _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 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.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=[]):
        """
        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:
        """
        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]
        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]
        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]
        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]
        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)


1		"""
2		High level interface to pure python OPC-UA server
3		"""
4
5	1	import logging
6	1	from datetime import timedelta
7	1	try:
8	1	from urllib.parse import urlparse
9		except ImportError:
10		from urlparse import urlparse
11
12
13	1	from opcua import ua
14		# from opcua.binary_server import BinaryServer
15	1	from opcua.server.binary_server_asyncio import BinaryServer
16	1	from opcua.server.internal_server import InternalServer
17	1	from opcua.server.event_generator import EventGenerator
18	1	from opcua.common.node import Node
19	1	from opcua.common.subscription import Subscription
20	1	from opcua.common import xmlimporter
21	1	from opcua.common.manage_nodes import delete_nodes
22	1	from opcua.client.client import Client
23	1	from opcua.crypto import security_policies
24	1	from opcua.common.event_objects import BaseEvent
25	1	from opcua.common.shortcuts import Shortcuts
26	1	from opcua.common.xmlexporter import XmlExporter
27	1	from opcua.common.ua_utils import get_nodes_of_namespace
28	1	use_crypto = True
29	1	try:
30	1	from opcua.crypto import uacrypto
31		except ImportError:
32		print("cryptography is not installed, use of crypto disabled")
33		use_crypto = False
34
35
36	1	class Server(object):
37
38		"""
39		High level Server class
40
41		This class creates an opcua server with default values
42
43		Create your own namespace and then populate your server address space
44		using use the get_root() or get_objects() to get Node objects.
45		and get_event_object() to fire events.
46		Then start server. See example_server.py
47		All methods are threadsafe
48
49		If you need more flexibility you call directly the Ua Service methods
50		on the iserver or iserver.isesssion object members.
51
52		During startup the standard address space will be constructed, which may be
53		time-consuming when running a server on a less powerful device (e.g. a
54		Raspberry Pi). In order to improve startup performance, a optional path to a
55		cache file can be passed to the server constructor.
56		If the parameter is defined, the address space will be loaded from the
57		cache file or the file will be created if it does not exist yet.
58		As a result the first startup will be even slower due to the cache file
59		generation but all further start ups will be significantly faster.
60
61		:ivar application_uri:
62		:vartype application_uri: uri
63		:ivar product_uri:
64		:vartype product_uri: uri
65		:ivar name:
66		:vartype name: string
67		:ivar default_timeout: timeout in milliseconds for sessions and secure channel
68		:vartype default_timeout: int
69		:ivar iserver: internal server object
70		:vartype default_timeout: InternalServer
71		:ivar bserver: binary protocol server
72		:vartype bserver: BinaryServer
73		:ivar nodes: shortcuts to common nodes
74		:vartype nodes: Shortcuts
75
76		"""
77
78	1	def __init__(self, shelffile=None, iserver=None):
79	1	self.logger = logging.getLogger(__name__)
80	1	self.endpoint = urlparse("opc.tcp://0.0.0.0:4840/freeopcua/server/")
81	1	self.application_uri = "urn:freeopcua:python:server"
82	1	self.product_uri = "urn:freeopcua.github.no:python:server"
83	1	self.name = "FreeOpcUa Python Server"
84	1	self.application_type = ua.ApplicationType.ClientAndServer
85	1	self.default_timeout = 3600000
86	1	if iserver is not None:
87		self.iserver = iserver
88		else:
89	1	self.iserver = InternalServer(shelffile)
90	1	self.bserver = None
91	1	self._discovery_clients = {}
92	1	self._discovery_period = 60
93	1	self.certificate = None
94	1	self.private_key = None
95	1	self._policies = []
96	1	self.nodes = Shortcuts(self.iserver.isession)
97
98		# setup some expected values
99	1	self.register_namespace(self.application_uri)
100	1	sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray))
101	1	sa_node.set_value([self.application_uri])
102
103	1	def __enter__(self):
104	1	self.start()
105	1	return self
106
107	1	def __exit__(self, exc_type, exc_value, traceback):
108	1	self.stop()
109
110	1	def load_certificate(self, path):
111		"""
112		load server certificate from file, either pem or der
113		"""
114	1	self.certificate = uacrypto.load_certificate(path)
115
116	1	def load_private_key(self, path):
117	1	self.private_key = uacrypto.load_private_key(path)
118
119	1	def disable_clock(self, val=True):
120		"""
121		for debugging you may want to disable clock that write every second
122		to address space
123		"""
124		self.iserver.disabled_clock = val
125
126	1	def set_application_uri(self, uri):
127		"""
128		Set application/server URI.
129		This uri is supposed to be unique. If you intent to register
130		your server to a discovery server, it really should be unique in
131		your system!
132		default is : "urn:freeopcua:python:server"
133		"""
134	1	self.application_uri = uri
135
136	1	def find_servers(self, uris=None):
137		"""
138		find_servers. mainly implemented for symmetry with client
139		"""
140	1	if uris is None:
141	1	uris = []
142	1	params = ua.FindServersParameters()
143	1	params.EndpointUrl = self.endpoint.geturl()
144	1	params.ServerUris = uris
145	1	return self.iserver.find_servers(params)
146
147	1	def register_to_discovery(self, url="opc.tcp://localhost:4840", period=60):
148		"""
149		Register to an OPC-UA Discovery server. Registering must be renewed at
150		least every 10 minutes, so this method will use our asyncio thread to
151		re-register every period seconds
152		if period is 0 registration is not automatically renewed
153		"""
154		# FIXME: have a period per discovery
155	1	if url in self._discovery_clients:
156	1	self._discovery_clients[url].disconnect()
157	1	self._discovery_clients[url] = Client(url)
158	1	self._discovery_clients[url].connect()
159	1	self._discovery_clients[url].register_server(self)
160	1	self._discovery_period = period
161	1	if period:
162		self.iserver.loop.call_soon(self._renew_registration)
163
164	1	def unregister_to_discovery(self, url="opc.tcp://localhost:4840"):
165		"""
166		stop registration thread
167		"""
168		# FIXME: is there really no way to deregister?
169		self._discovery_clients[url].disconnect()
170
171	1	def _renew_registration(self):
172		for client in self._discovery_clients.values():
173		client.register_server(self)
174		self.iserver.loop.call_later(self._discovery_period, self._renew_registration)
175
176	1	def get_client_to_discovery(self, url="opc.tcp://localhost:4840"):
177		"""
178		Create a client to discovery server and return it
179		"""
180		client = Client(url)
181		client.connect()
182		return client
183
184	1	def allow_remote_admin(self, allow):
185		"""
186		Enable or disable the builtin Admin user from network clients
187		"""
188		self.iserver.allow_remote_admin = allow
189
190	1	def set_endpoint(self, url):
191	1	self.endpoint = urlparse(url)
192
193	1	def get_endpoints(self):
194	1	return self.iserver.get_endpoints()
195
196	1	def _setup_server_nodes(self):
197		# to be called just before starting server since it needs all parameters to be setup
198	1	self._set_endpoints()
199	1	self._policies = [ua.SecurityPolicyFactory()]
200	1	if self.certificate and self.private_key:
201	1	self._set_endpoints(security_policies.SecurityPolicyBasic128Rsa15,
202		ua.MessageSecurityMode.SignAndEncrypt)
203	1	self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic128Rsa15,
204		ua.MessageSecurityMode.SignAndEncrypt,
205		self.certificate,
206		self.private_key)
207		)
208	1	self._set_endpoints(security_policies.SecurityPolicyBasic128Rsa15,
209		ua.MessageSecurityMode.Sign)
210	1	self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic128Rsa15,
211		ua.MessageSecurityMode.Sign,
212		self.certificate,
213		self.private_key)
214		)
215	1	self._set_endpoints(security_policies.SecurityPolicyBasic256,
216		ua.MessageSecurityMode.SignAndEncrypt)
217	1	self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256,
218		ua.MessageSecurityMode.SignAndEncrypt,
219		self.certificate,
220		self.private_key)
221		)
222	1	self._set_endpoints(security_policies.SecurityPolicyBasic256,
223		ua.MessageSecurityMode.Sign)
224	1	self._policies.append(ua.SecurityPolicyFactory(security_policies.SecurityPolicyBasic256,
225		ua.MessageSecurityMode.Sign,
226		self.certificate,
227		self.private_key)
228		)
229
230	1	def _set_endpoints(self, policy=ua.SecurityPolicy, mode=ua.MessageSecurityMode.None_):
231	1	idtoken = ua.UserTokenPolicy()
232	1	idtoken.PolicyId = 'anonymous'
233	1	idtoken.TokenType = ua.UserTokenType.Anonymous
234
235	1	idtoken2 = ua.UserTokenPolicy()
236	1	idtoken2.PolicyId = 'certificate_basic256'
237	1	idtoken2.TokenType = ua.UserTokenType.Certificate
238
239	1	idtoken3 = ua.UserTokenPolicy()
240	1	idtoken3.PolicyId = 'certificate_basic128'
241	1	idtoken3.TokenType = ua.UserTokenType.Certificate
242
243	1	idtoken4 = ua.UserTokenPolicy()
244	1	idtoken4.PolicyId = 'username'
245	1	idtoken4.TokenType = ua.UserTokenType.UserName
246
247	1	appdesc = ua.ApplicationDescription()
248	1	appdesc.ApplicationName = ua.LocalizedText(self.name)
249	1	appdesc.ApplicationUri = self.application_uri
250	1	appdesc.ApplicationType = self.application_type
251	1	appdesc.ProductUri = self.product_uri
252	1	appdesc.DiscoveryUrls.append(self.endpoint.geturl())
253
254	1	edp = ua.EndpointDescription()
255	1	edp.EndpointUrl = self.endpoint.geturl()
256	1	edp.Server = appdesc
257	1	if self.certificate:
258	1	edp.ServerCertificate = uacrypto.der_from_x509(self.certificate)
259	1	edp.SecurityMode = mode
260	1	edp.SecurityPolicyUri = policy.URI
261	1	edp.UserIdentityTokens = [idtoken, idtoken2, idtoken3, idtoken4]
262	1	edp.TransportProfileUri = 'http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary'
263	1	edp.SecurityLevel = 0
264	1	self.iserver.add_endpoint(edp)
265
266	1	def set_server_name(self, name):
267		self.name = name
268
269	1	def start(self):
270		"""
271		Start to listen on network
272		"""
273	1	self._setup_server_nodes()
274	1	self.iserver.start()
275	1	self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port)
276	1	self.bserver.set_policies(self._policies)
277	1	self.bserver.start()
278
279	1	def stop(self):
280		"""
281		Stop server
282		"""
283	1	for client in self._discovery_clients.values():
284	1	client.disconnect()
285	1	self.bserver.stop()
286	1	self.iserver.stop()
287
288	1	def get_root_node(self):
289		"""
290		Get Root node of server. Returns a Node object.
291		"""
292	1	return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.RootFolder))
293
294	1	def get_objects_node(self):
295		"""
296		Get Objects node of server. Returns a Node object.
297		"""
298	1	return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.ObjectsFolder))
299
300	1	def get_server_node(self):
301		"""
302		Get Server node of server. Returns a Node object.
303		"""
304	1	return self.get_node(ua.TwoByteNodeId(ua.ObjectIds.Server))
305
306	1	def get_node(self, nodeid):
307		"""
308		Get a specific node using NodeId object or a string representing a NodeId
309		"""
310	1	return Node(self.iserver.isession, nodeid)
311
312	1	def create_subscription(self, period, handler):
313		"""
314		Create a subscription.
315		returns a Subscription object which allow
316		to subscribe to events or data on server
317		"""
318	1	params = ua.CreateSubscriptionParameters()
319	1	params.RequestedPublishingInterval = period
320	1	params.RequestedLifetimeCount = 3000
321	1	params.RequestedMaxKeepAliveCount = 10000
322	1	params.MaxNotificationsPerPublish = 0
323	1	params.PublishingEnabled = True
324	1	params.Priority = 0
325	1	return Subscription(self.iserver.isession, params, handler)
326
327	1	def get_namespace_array(self):
328		"""
329		get all namespace defined in server
330		"""
331	1	ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
332	1	return ns_node.get_value()
333
334	1	def register_namespace(self, uri):
335		"""
336		Register a new namespace. Nodes should in custom namespace, not 0.
337		"""
338	1	ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray))
339	1	uries = ns_node.get_value()
340	1	if uri in uries:
341	1	return uries.index(uri)
342	1	uries.append(uri)
343	1	ns_node.set_value(uries)
344	1	return len(uries) - 1
345
346	1	def get_namespace_index(self, uri):
347		"""
348		get index of a namespace using its uri
349		"""
350	1	uries = self.get_namespace_array()
351	1	return uries.index(uri)
352
353	1	def get_event_generator(self, etype=None, source=ua.ObjectIds.Server):
354		"""
355		Returns an event object using an event type from address space.
356		Use this object to fire events
357		"""
358	1	if not etype:
359	1	etype = BaseEvent()
360	1	return EventGenerator(self.iserver.isession, etype, source)
361
362	1	def create_custom_data_type(self, idx, name, basetype=ua.ObjectIds.BaseDataType, properties=[]):
363	1	return self._create_custom_type(idx, name, basetype, properties, [], [])
364
365	1	def create_custom_event_type(self, idx, name, basetype=ua.ObjectIds.BaseEventType, properties=[]):
366	1	return self._create_custom_type(idx, name, basetype, properties, [], [])
367
368	1	def create_custom_object_type(self, idx, name, basetype=ua.ObjectIds.BaseObjectType, properties=[], variables=[], methods=[]):
369	1	return self._create_custom_type(idx, name, basetype, properties, variables, methods)
370
371		# def create_custom_reference_type(self, idx, name, basetype=ua.ObjectIds.BaseReferenceType, properties=[]):
372		# return self._create_custom_type(idx, name, basetype, properties)
373
374	1	def create_custom_variable_type(self, idx, name, basetype=ua.ObjectIds.BaseVariableType, properties=[], variables=[], methods=[]):
375	1	return self._create_custom_type(idx, name, basetype, properties, variables, methods)
376
377	1	def _create_custom_type(self, idx, name, basetype, properties, variables, methods):
378	1	if isinstance(basetype, Node):
379	1	base_t = basetype
380	1	elif isinstance(basetype, ua.NodeId):
381	1	base_t = Node(self.iserver.isession, basetype)
382		else:
383	1	base_t = Node(self.iserver.isession, ua.NodeId(basetype))
384
385	1	custom_t = base_t.add_object_type(idx, name)
386	1	for prop in properties:
387	1	datatype = None
388	1	if len(prop) > 2:
389		datatype = prop[2]
390	1	custom_t.add_property(idx, prop[0], ua.get_default_value(prop[1]), varianttype=prop[1], datatype=datatype)
391	1	for variable in variables:
392	1	datatype = None
393	1	if len(variable) > 2:
394	1	datatype = variable[2]
395	1	custom_t.add_variable(idx, variable[0], ua.get_default_value(variable[1]), varianttype=variable[1], datatype=datatype)
396	1	for method in methods:
397	1	custom_t.add_method(idx, method[0], method[1], method[2], method[3])
398
399	1	return custom_t
400
401	1	def import_xml(self, path):
402		"""
403		Import nodes defined in xml
404		"""
405	1	importer = xmlimporter.XmlImporter(self)
406	1	return importer.import_xml(path)
407
408	1	def export_xml(self, nodes, path):
409		"""
410		Export defined nodes to xml
411		"""
412	1	exp = XmlExporter(self)
413	1	exp.build_etree(nodes)
414	1	return exp.write_xml(path)
415
416	1	def export_xml_by_ns(self, path, namespaces=[]):
417		"""
418		Export nodes of one or more namespaces to an XML file.
419		Namespaces used by nodes are always exported for consistency.
420		Args:
421		server: opc ua server to use
422		path: name of the xml file to write
423		namespaces: list of string uris or int indexes of the namespace to export, if not provide all ns are used except 0
424
425		Returns:
426		"""
427		nodes = get_nodes_of_namespace(self, namespaces)
428		self.export_xml(nodes, path)
429
430	1	def delete_nodes(self, nodes, recursive=False):
431	1	return delete_nodes(self.iserver.isession, nodes, recursive)
432
433	1	def historize_node_data_change(self, node, period=timedelta(days=7), count=0):
434		"""
435		Start historizing supplied nodes; see history module
436		Args:
437		node: node or list of nodes that can be historized (variables/properties)
438		period: time delta to store the history; older data will be deleted from the storage
439		count: number of changes to store in the history
440
441		Returns:
442		"""
443	1	nodes = [node]
444	1	for node in nodes:
445	1	self.iserver.enable_history_data_change(node, period, count)
446
447	1	def dehistorize_node_data_change(self, node):
448		"""
449		Stop historizing supplied nodes; see history module
450		Args:
451		node: node or list of nodes that can be historized (UA variables/properties)
452
453		Returns:
454		"""
455		nodes = [node]
456		for node in nodes:
457		self.iserver.disable_history_data_change(node)
458
459	1	def historize_node_event(self, node, period=timedelta(days=7), count=0):
460		"""
461		Start historizing events from node (typically a UA object); see history module
462		Args:
463		node: node or list of nodes that can be historized (UA objects)
464		period: time delta to store the history; older data will be deleted from the storage
465		count: number of events to store in the history
466
467		Returns:
468		"""
469	1	nodes = [node]
470	1	for node in nodes:
471	1	self.iserver.enable_history_event(node, period, count)
472
473	1	def dehistorize_node_event(self, node):
474		"""
475		Stop historizing events from node (typically a UA object); see history module
476		Args:
477		node: node or list of nodes that can be historized (UA objects)
478
479		Returns:
480		"""
481		nodes = [node]
482		for node in nodes:
483		self.iserver.disable_history_event(node)
484
485	1	def subscribe_server_callback(self, event, handle):
486		self.iserver.subscribe_server_callback(event, handle)
487
488	1	def unsubscribe_server_callback(self, event, handle):
489		self.iserver.unsubscribe_server_callback(event, handle)
490
491	1	def link_method(self, node, callback):
492		"""
493		Link a python function to a UA method in the address space; required when a UA method has been imported
494		to the address space via XML; the python executable must be linked manually
495		Args:
496		node: UA method node
497		callback: python function that the UA method will call
498
499		Returns:
500		"""
501		self.iserver.isession.add_method_callback(node.nodeid, callback)
502

FreeOpcUa / python-opcua

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Server.historize_node_data_change() A

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