|
1
|
|
|
""" |
|
2
|
|
|
High level interface to pure python OPC-UA server |
|
3
|
|
|
""" |
|
4
|
|
|
|
|
5
|
1 |
|
import logging |
|
6
|
1 |
|
try: |
|
7
|
1 |
|
from urllib.parse import urlparse |
|
8
|
|
|
except ImportError: |
|
9
|
|
|
from urlparse import urlparse |
|
10
|
|
|
|
|
11
|
|
|
|
|
12
|
1 |
|
from opcua import ua |
|
13
|
|
|
#from opcua.binary_server import BinaryServer |
|
14
|
1 |
|
from opcua.binary_server_asyncio import BinaryServer |
|
15
|
1 |
|
from opcua.internal_server import InternalServer |
|
16
|
1 |
|
from opcua import Node, Subscription, ObjectIds, Event |
|
17
|
1 |
|
from opcua import xmlimporter |
|
18
|
1 |
|
from opcua import Client |
|
19
|
|
|
|
|
20
|
|
|
|
|
21
|
1 |
|
class Server(object): |
|
22
|
|
|
|
|
23
|
|
|
""" |
|
24
|
|
|
High level Server class |
|
25
|
|
|
Create an opcua server with default values |
|
26
|
|
|
The class is very short. Users are adviced to read the code. |
|
27
|
|
|
Create your own namespace and then populate your server address space |
|
28
|
|
|
using use the get_root() or get_objects() to get Node objects. |
|
29
|
|
|
and get_event_object() to fire events. |
|
30
|
|
|
Then start server. See example_server.py |
|
31
|
|
|
All methods are threadsafe |
|
32
|
|
|
|
|
33
|
|
|
|
|
34
|
|
|
:ivar application_uri: |
|
35
|
|
|
:vartype application_uri: uri |
|
36
|
|
|
:ivar product_uri: |
|
37
|
|
|
:vartype product_uri: uri |
|
38
|
|
|
:ivar name: |
|
39
|
|
|
:vartype name: string |
|
40
|
|
|
:ivar default_timeout: timout in milliseconds for sessions and secure channel |
|
41
|
|
|
:vartype default_timeout: int |
|
42
|
|
|
:ivar iserver: internal server object |
|
43
|
|
|
:vartype default_timeout: InternalServer |
|
44
|
|
|
:ivar bserver: binary protocol server |
|
45
|
|
|
:vartype bserver: BinaryServer |
|
46
|
|
|
|
|
47
|
|
|
""" |
|
48
|
|
|
|
|
49
|
1 |
|
def __init__(self): |
|
50
|
1 |
|
self.logger = logging.getLogger(__name__) |
|
51
|
1 |
|
self.endpoint = urlparse("opc.tcp://0.0.0.0:4841/freeopcua/server/") |
|
52
|
1 |
|
self.application_uri = "urn:freeopcua:python:server" |
|
53
|
1 |
|
self.product_uri = "urn:freeopcua.github.no:python:server" |
|
54
|
1 |
|
self.name = "FreeOpcUa Python Server" |
|
55
|
1 |
|
self.application_type = ua.ApplicationType.ClientAndServer |
|
56
|
1 |
|
self.default_timeout = 3600000 |
|
57
|
1 |
|
self.iserver = InternalServer() |
|
58
|
1 |
|
self.bserver = None |
|
59
|
1 |
|
self._discovery_client = None |
|
60
|
1 |
|
self._discovery_period = 60 |
|
61
|
|
|
|
|
62
|
|
|
# setup some expected values |
|
63
|
1 |
|
self.register_namespace(self.application_uri) |
|
64
|
1 |
|
sa_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_ServerArray)) |
|
65
|
1 |
|
sa_node.set_value([self.application_uri]) |
|
66
|
|
|
|
|
67
|
1 |
|
def disable_clock(self, val=True): |
|
68
|
|
|
""" |
|
69
|
|
|
for debugging you may want to disable clock that write every second |
|
70
|
|
|
to address space |
|
71
|
|
|
""" |
|
72
|
|
|
self.iserver.disabled_clock = val |
|
73
|
|
|
|
|
74
|
1 |
|
def set_application_uri(self, uri): |
|
75
|
|
|
""" |
|
76
|
|
|
Set application/server URI. |
|
77
|
|
|
This uri is supposed to be unique. If you intent to register |
|
78
|
|
|
your server to a discovery server, it really should be unique in |
|
79
|
|
|
your system! |
|
80
|
|
|
default is : "urn:freeopcua:python:server" |
|
81
|
|
|
""" |
|
82
|
1 |
|
self.application_uri = uri |
|
83
|
|
|
|
|
84
|
1 |
|
def find_servers(self, uris=None): |
|
85
|
|
|
""" |
|
86
|
|
|
find_servers. mainly implemented for simmetry with client |
|
87
|
|
|
""" |
|
88
|
1 |
|
if uris is None: |
|
89
|
1 |
|
uris = [] |
|
90
|
1 |
|
params = ua.FindServersParameters() |
|
91
|
1 |
|
params.EndpointUrl = self.endpoint.geturl() |
|
92
|
1 |
|
params.ServerUris = uris |
|
93
|
1 |
|
return self.iserver.find_servers(params) |
|
94
|
|
|
|
|
95
|
1 |
|
def register_to_discovery(self, url, period=60): |
|
96
|
|
|
""" |
|
97
|
|
|
Register to a OPC-UA Discovery server. Registering must be renewed at |
|
98
|
|
|
least every 10 minutes, so this method will use our asyncio thread to |
|
99
|
|
|
re-register every period seconds |
|
100
|
|
|
""" |
|
101
|
1 |
|
self._discovery_period = period |
|
102
|
1 |
|
self._discovery_client = Client(url) |
|
103
|
1 |
|
self._discovery_client.connect() |
|
104
|
1 |
|
self.iserver.loop.call_soon(self._renew_registration) |
|
105
|
|
|
|
|
106
|
1 |
|
def _renew_registration(self): |
|
107
|
1 |
|
if self._discovery_client: |
|
108
|
1 |
|
self._discovery_client.register_server(self) |
|
109
|
1 |
|
self.iserver.loop.call_later(self._discovery_period, self._renew_registration) |
|
110
|
|
|
|
|
111
|
1 |
|
def allow_remote_admin(self, allow): |
|
112
|
|
|
""" |
|
113
|
|
|
Enable or disable the builtin Admin user from network clients |
|
114
|
|
|
""" |
|
115
|
|
|
self.iserver.allow_remote_admin = allow |
|
116
|
|
|
|
|
117
|
1 |
|
def set_endpoint(self, url): |
|
118
|
1 |
|
self.endpoint = urlparse(url) |
|
119
|
|
|
|
|
120
|
1 |
|
def get_endpoints(self): |
|
121
|
1 |
|
return self.iserver.get_endpoints() |
|
122
|
|
|
|
|
123
|
1 |
|
def _setup_server_nodes(self): |
|
124
|
|
|
# to be called just before starting server since it needs all parameters to be setup |
|
125
|
1 |
|
self._set_endpoints() |
|
126
|
|
|
|
|
127
|
1 |
|
def _set_endpoints(self): |
|
128
|
1 |
|
idtoken = ua.UserTokenPolicy() |
|
129
|
1 |
|
idtoken.PolicyId = 'anonymous' |
|
130
|
1 |
|
idtoken.TokenType = ua.UserTokenType.Anonymous |
|
131
|
|
|
|
|
132
|
1 |
|
idtoken2 = ua.UserTokenPolicy() |
|
133
|
1 |
|
idtoken2.PolicyId = 'certificate_basic256' |
|
134
|
1 |
|
idtoken2.TokenType = ua.UserTokenType.Certificate |
|
135
|
|
|
|
|
136
|
1 |
|
idtoken3 = ua.UserTokenPolicy() |
|
137
|
1 |
|
idtoken3.PolicyId = 'certificate_basic128' |
|
138
|
1 |
|
idtoken3.TokenType = ua.UserTokenType.Certificate |
|
139
|
|
|
|
|
140
|
1 |
|
idtoken4 = ua.UserTokenPolicy() |
|
141
|
1 |
|
idtoken4.PolicyId = 'username' |
|
142
|
1 |
|
idtoken4.TokenType = ua.UserTokenType.UserName |
|
143
|
|
|
|
|
144
|
1 |
|
appdesc = ua.ApplicationDescription() |
|
145
|
1 |
|
appdesc.ApplicationName = ua.LocalizedText(self.name) |
|
146
|
1 |
|
appdesc.ApplicationUri = self.application_uri |
|
147
|
1 |
|
appdesc.ApplicationType = self.application_type |
|
148
|
1 |
|
appdesc.ProductUri = self.product_uri |
|
149
|
1 |
|
appdesc.DiscoveryUrls.append(self.endpoint.geturl()) |
|
150
|
|
|
|
|
151
|
1 |
|
edp = ua.EndpointDescription() |
|
152
|
1 |
|
edp.EndpointUrl = self.endpoint.geturl() |
|
153
|
1 |
|
edp.Server = appdesc |
|
154
|
1 |
|
edp.SecurityMode = ua.MessageSecurityMode.None_ |
|
155
|
1 |
|
edp.SecurityPolicyUri = 'http://opcfoundation.org/UA/SecurityPolicy#None' |
|
156
|
1 |
|
edp.UserIdentityTokens = [idtoken, idtoken2, idtoken3] |
|
157
|
1 |
|
edp.TransportProfileUri = 'http://opcfoundation.org/UA-Profile/Transport/uatcp-uasc-uabinary' |
|
158
|
1 |
|
edp.SecurityLevel = 0 |
|
159
|
1 |
|
self.iserver.add_endpoint(edp) |
|
160
|
|
|
|
|
161
|
1 |
|
def set_server_name(self, name): |
|
162
|
|
|
self.name = name |
|
163
|
|
|
|
|
164
|
1 |
|
def start(self): |
|
165
|
|
|
""" |
|
166
|
|
|
Start to listen on network |
|
167
|
|
|
""" |
|
168
|
1 |
|
self.iserver.start() |
|
169
|
1 |
|
self._setup_server_nodes() |
|
170
|
1 |
|
self.bserver = BinaryServer(self.iserver, self.endpoint.hostname, self.endpoint.port) |
|
171
|
1 |
|
self.bserver.start() |
|
172
|
|
|
|
|
173
|
1 |
|
def stop(self): |
|
174
|
|
|
""" |
|
175
|
|
|
Stop server |
|
176
|
|
|
""" |
|
177
|
1 |
|
if self._discovery_client: |
|
178
|
1 |
|
self._discovery_client.disconnect() |
|
179
|
1 |
|
self.bserver.stop() |
|
180
|
1 |
|
self.iserver.stop() |
|
181
|
|
|
|
|
182
|
1 |
|
def get_root_node(self): |
|
183
|
|
|
""" |
|
184
|
|
|
Get Root node of server. Returns a Node object. |
|
185
|
|
|
""" |
|
186
|
1 |
|
return self.get_node(ua.TwoByteNodeId(ObjectIds.RootFolder)) |
|
187
|
|
|
|
|
188
|
1 |
|
def get_objects_node(self): |
|
189
|
|
|
""" |
|
190
|
|
|
Get Objects node of server. Returns a Node object. |
|
191
|
|
|
""" |
|
192
|
1 |
|
return self.get_node(ua.TwoByteNodeId(ObjectIds.ObjectsFolder)) |
|
193
|
|
|
|
|
194
|
1 |
|
def get_server_node(self): |
|
195
|
|
|
""" |
|
196
|
|
|
Get Server node of server. Returns a Node object. |
|
197
|
|
|
""" |
|
198
|
1 |
|
return self.get_node(ua.TwoByteNodeId(ObjectIds.Server)) |
|
199
|
|
|
|
|
200
|
1 |
|
def get_node(self, nodeid): |
|
201
|
|
|
""" |
|
202
|
|
|
Get a specific node using NodeId object or a string representing a NodeId |
|
203
|
|
|
""" |
|
204
|
1 |
|
return Node(self.iserver.isession, nodeid) |
|
205
|
|
|
|
|
206
|
1 |
|
def create_subscription(self, period, handler): |
|
207
|
|
|
""" |
|
208
|
|
|
Create a subscription. |
|
209
|
|
|
returns a Subscription object which allow |
|
210
|
|
|
to subscribe to events or data on server |
|
211
|
|
|
""" |
|
212
|
1 |
|
params = ua.CreateSubscriptionParameters() |
|
213
|
1 |
|
params.RequestedPublishingInterval = period |
|
214
|
1 |
|
params.RequestedLifetimeCount = 3000 |
|
215
|
1 |
|
params.RequestedMaxKeepAliveCount = 10000 |
|
216
|
1 |
|
params.MaxNotificationsPerPublish = 0 |
|
217
|
1 |
|
params.PublishingEnabled = True |
|
218
|
1 |
|
params.Priority = 0 |
|
219
|
1 |
|
return Subscription(self.iserver.isession, params, handler) |
|
220
|
|
|
|
|
221
|
1 |
|
def get_namespace_array(self): |
|
222
|
|
|
""" |
|
223
|
|
|
get all namespace defined in server |
|
224
|
|
|
""" |
|
225
|
1 |
|
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
|
226
|
1 |
|
return ns_node.get_value() |
|
227
|
|
|
|
|
228
|
1 |
|
def register_namespace(self, uri): |
|
229
|
|
|
""" |
|
230
|
|
|
Register a new namespace. Nodes should in custom namespace, not 0. |
|
231
|
|
|
""" |
|
232
|
1 |
|
ns_node = self.get_node(ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
|
233
|
1 |
|
uries = ns_node.get_value() |
|
234
|
1 |
|
uries.append(uri) |
|
235
|
1 |
|
ns_node.set_value(uries) |
|
236
|
1 |
|
return (len(uries) - 1) |
|
237
|
|
|
|
|
238
|
1 |
|
def get_namespace_index(self, uri): |
|
239
|
|
|
""" |
|
240
|
|
|
get index of a namespace using its uri |
|
241
|
|
|
""" |
|
242
|
1 |
|
uries = self.get_namespace_array() |
|
243
|
1 |
|
return uries.index(uri) |
|
244
|
|
|
|
|
245
|
1 |
|
def get_event_object(self, etype=ObjectIds.BaseEventType, source=ObjectIds.Server): |
|
246
|
|
|
""" |
|
247
|
|
|
Returns an event object using an event type from address space. |
|
248
|
|
|
Use this object to fire events |
|
249
|
|
|
""" |
|
250
|
|
|
return Event(self.iserver.isession, etype, source) |
|
251
|
|
|
|
|
252
|
1 |
|
def import_xml(self, path): |
|
253
|
|
|
""" |
|
254
|
|
|
import nodes defined in xml |
|
255
|
|
|
""" |
|
256
|
1 |
|
importer = xmlimporter.XmlImporter(self.iserver.node_mgt_service) |
|
257
|
|
|
importer.import_xml(path) |
|
258
|
|
|
|
FreeOpcUa /
python-opcua
