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1
|
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""" |
|
2
|
|
|
Internal server implementing opcu-ua interface. |
|
3
|
|
|
Can be used on server side or to implement binary/https opc-ua servers |
|
4
|
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|
""" |
|
5
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6
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1 |
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from datetime import datetime |
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7
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1 |
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from copy import copy, deepcopy |
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8
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1 |
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from datetime import timedelta |
|
9
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1 |
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from os import path |
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10
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1 |
|
import logging |
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11
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1 |
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from threading import Lock |
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12
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1 |
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from enum import Enum |
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13
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1 |
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try: |
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14
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1 |
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from urllib.parse import urlparse |
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15
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1 |
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except ImportError: |
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16
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1 |
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from urlparse import urlparse |
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17
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|
18
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19
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1 |
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from opcua import ua |
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20
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1 |
|
from opcua.common import utils |
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21
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1 |
|
from opcua.common.callback import (CallbackType, ServerItemCallback, |
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22
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CallbackDispatcher) |
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23
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1 |
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from opcua.common.node import Node |
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24
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1 |
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from opcua.server.history import HistoryManager |
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25
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1 |
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from opcua.server.address_space import AddressSpace |
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26
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1 |
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from opcua.server.address_space import AttributeService |
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27
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1 |
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from opcua.server.address_space import ViewService |
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28
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1 |
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from opcua.server.address_space import NodeManagementService |
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29
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1 |
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from opcua.server.address_space import MethodService |
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30
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1 |
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from opcua.server.subscription_service import SubscriptionService |
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31
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1 |
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from opcua.server.standard_address_space import standard_address_space |
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32
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1 |
|
from opcua.server.users import User |
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33
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1 |
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from opcua.common import xmlimporter |
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34
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35
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36
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1 |
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class SessionState(Enum): |
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37
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1 |
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Created = 0 |
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38
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1 |
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Activated = 1 |
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39
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1 |
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Closed = 2 |
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40
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41
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42
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1 |
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class ServerDesc(object): |
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43
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1 |
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def __init__(self, serv, cap=None): |
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44
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1 |
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self.Server = serv |
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45
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1 |
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self.Capabilities = cap |
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46
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|
47
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|
48
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1 |
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class InternalServer(object): |
|
49
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|
50
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1 |
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def __init__(self, shelffile=None): |
|
51
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1 |
|
self.logger = logging.getLogger(__name__) |
|
52
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|
53
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1 |
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self.server_callback_dispatcher = CallbackDispatcher() |
|
54
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|
55
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1 |
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self.endpoints = [] |
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56
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1 |
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self._channel_id_counter = 5 |
|
57
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1 |
|
self.allow_remote_admin = True |
|
58
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1 |
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self.disabled_clock = False # for debugging we may want to disable clock that writes too much in log |
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59
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1 |
|
self._known_servers = {} # used if we are a discovery server |
|
60
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|
|
61
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1 |
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self.aspace = AddressSpace() |
|
62
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1 |
|
self.attribute_service = AttributeService(self.aspace) |
|
63
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1 |
|
self.view_service = ViewService(self.aspace) |
|
64
|
1 |
|
self.method_service = MethodService(self.aspace) |
|
65
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1 |
|
self.node_mgt_service = NodeManagementService(self.aspace) |
|
66
|
|
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|
|
67
|
1 |
|
self.load_standard_address_space(shelffile) |
|
68
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|
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|
|
69
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1 |
|
self.loop = utils.ThreadLoop() |
|
70
|
1 |
|
self.asyncio_transports = [] |
|
71
|
1 |
|
self.subscription_service = SubscriptionService(self.loop, self.aspace) |
|
72
|
|
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|
|
73
|
1 |
|
self.history_manager = HistoryManager(self) |
|
74
|
|
|
|
|
75
|
|
|
# create a session to use on server side |
|
76
|
1 |
|
self.isession = InternalSession(self, self.aspace, self.subscription_service, "Internal", user=User.Admin) |
|
77
|
|
|
|
|
78
|
1 |
|
self.current_time_node = Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_CurrentTime)) |
|
79
|
1 |
|
self._address_space_fixes() |
|
80
|
|
|
self.setup_nodes() |
|
81
|
1 |
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|
|
82
|
|
|
def setup_nodes(self): |
|
83
|
|
|
""" |
|
84
|
|
|
Set up some nodes as defined by spec |
|
85
|
1 |
|
""" |
|
86
|
1 |
|
uries = ["http://opcfoundation.org/UA/"] |
|
87
|
1 |
|
ns_node = Node(self.isession, ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
|
88
|
|
|
ns_node.set_value(uries) |
|
89
|
1 |
|
|
|
90
|
|
|
def load_standard_address_space(self, shelffile=None): |
|
91
|
1 |
|
# check for a python shelf file, in windows the file extension is also needed for the check |
|
92
|
1 |
|
shelffile_win = shelffile |
|
93
|
|
|
if shelffile_win: |
|
94
|
|
|
shelffile_win += ".dat" |
|
95
|
1 |
|
|
|
96
|
|
|
if shelffile and (path.isfile(shelffile) or path.isfile(shelffile_win)): |
|
97
|
|
|
# import address space from shelf |
|
98
|
|
|
self.aspace.load_aspace_shelf(shelffile) |
|
99
|
|
|
else: |
|
100
|
1 |
|
# import address space from code generated from xml |
|
101
|
|
|
standard_address_space.fill_address_space(self.node_mgt_service) |
|
102
|
|
|
# import address space directly from xml, this has performance impact so disabled |
|
103
|
|
|
# importer = xmlimporter.XmlImporter(self.node_mgt_service) |
|
104
|
|
|
# importer.import_xml("/path/to/python-opcua/schemas/Opc.Ua.NodeSet2.xml", self) |
|
105
|
|
|
|
|
106
|
1 |
|
# if a cache file was supplied a shelve of the standard address space can now be built for next start up |
|
107
|
|
|
if shelffile: |
|
108
|
|
|
self.aspace.make_aspace_shelf(shelffile) |
|
109
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1 |
|
|
|
110
|
|
|
def _address_space_fixes(self): |
|
111
|
|
|
""" |
|
112
|
|
|
Looks like the xml definition of address space has some error. This is a good place to fix them |
|
113
|
|
|
""" |
|
114
|
|
|
|
|
115
|
1 |
|
it = ua.AddReferencesItem() |
|
116
|
|
|
it.SourceNodeId = ua.NodeId(ua.ObjectIds.BaseObjectType) |
|
117
|
|
|
it.ReferenceTypeId = ua.NodeId(ua.ObjectIds.Organizes) |
|
118
|
|
|
it.IsForward = False |
|
119
|
|
|
it.TargetNodeId = ua.NodeId(ua.ObjectIds.ObjectTypesFolder) |
|
120
|
|
|
it.TargetNodeClass = ua.NodeClass.Object |
|
121
|
1 |
|
|
|
122
|
1 |
|
results = self.isession.add_references([it]) |
|
123
|
1 |
|
|
|
124
|
1 |
|
def load_address_space(self, path): |
|
125
|
1 |
|
""" |
|
126
|
1 |
|
Load address space from path |
|
127
|
1 |
|
""" |
|
128
|
1 |
|
self.aspace.load(path) |
|
129
|
1 |
|
|
|
130
|
|
|
def dump_address_space(self, path): |
|
131
|
1 |
|
""" |
|
132
|
1 |
|
Dump current address space to path |
|
133
|
1 |
|
""" |
|
134
|
1 |
|
self.aspace.dump(path) |
|
135
|
1 |
|
|
|
136
|
|
|
def start(self): |
|
137
|
1 |
|
self.logger.info("starting internal server") |
|
138
|
1 |
|
for edp in self.endpoints: |
|
139
|
1 |
|
self._known_servers[edp.Server.ApplicationUri] = ServerDesc(edp.Server) |
|
140
|
|
|
self.loop.start() |
|
141
|
1 |
|
Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_State)).set_value(0, ua.VariantType.Int32) |
|
142
|
1 |
|
Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_StartTime)).set_value(datetime.utcnow()) |
|
143
|
1 |
|
if not self.disabled_clock: |
|
144
|
|
|
self._set_current_time() |
|
145
|
1 |
|
|
|
146
|
1 |
|
def stop(self): |
|
147
|
|
|
self.logger.info("stopping internal server") |
|
148
|
1 |
|
self.isession.close_session() |
|
149
|
1 |
|
self.loop.stop() |
|
150
|
1 |
|
self.history_manager.stop() |
|
151
|
|
|
|
|
152
|
1 |
|
def _set_current_time(self): |
|
153
|
1 |
|
self.current_time_node.set_value(datetime.utcnow()) |
|
154
|
1 |
|
self.loop.call_later(1, self._set_current_time) |
|
155
|
1 |
|
|
|
156
|
1 |
|
def get_new_channel_id(self): |
|
157
|
1 |
|
self._channel_id_counter += 1 |
|
158
|
1 |
|
return self._channel_id_counter |
|
159
|
1 |
|
|
|
160
|
1 |
|
def add_endpoint(self, endpoint): |
|
161
|
|
|
self.endpoints.append(endpoint) |
|
162
|
1 |
|
|
|
163
|
1 |
|
def get_endpoints(self, params=None, sockname=None): |
|
164
|
1 |
|
self.logger.info("get endpoint") |
|
165
|
1 |
|
if sockname: |
|
166
|
1 |
|
# return to client the ip address it has access to |
|
167
|
1 |
|
edps = [] |
|
168
|
1 |
|
for edp in self.endpoints: |
|
169
|
1 |
|
edp1 = copy(edp) |
|
170
|
1 |
|
url = urlparse(edp1.EndpointUrl) |
|
171
|
1 |
|
url = url._replace(netloc=sockname[0] + ":" + str(sockname[1])) |
|
172
|
1 |
|
edp1.EndpointUrl = url.geturl() |
|
173
|
1 |
|
edps.append(edp1) |
|
174
|
|
|
return edps |
|
175
|
1 |
|
return self.endpoints[:] |
|
176
|
1 |
|
|
|
177
|
1 |
|
def find_servers(self, params): |
|
178
|
1 |
|
if not params.ServerUris: |
|
179
|
|
|
return [desc.Server for desc in self._known_servers.values()] |
|
180
|
1 |
|
servers = [] |
|
181
|
1 |
|
for serv in self._known_servers.values(): |
|
182
|
1 |
|
serv_uri = serv.Server.ApplicationUri.split(":") |
|
183
|
|
|
for uri in params.ServerUris: |
|
184
|
1 |
|
uri = uri.split(":") |
|
185
|
1 |
|
if serv_uri[:len(uri)] == uri: |
|
186
|
|
|
servers.append(serv.Server) |
|
187
|
1 |
|
break |
|
188
|
|
|
return servers |
|
189
|
|
|
|
|
190
|
1 |
|
def register_server(self, server, conf=None): |
|
191
|
1 |
|
appdesc = ua.ApplicationDescription() |
|
192
|
|
|
appdesc.ApplicationUri = server.ServerUri |
|
193
|
1 |
|
appdesc.ProductUri = server.ProductUri |
|
194
|
|
|
# FIXME: select name from client locale |
|
195
|
|
|
appdesc.ApplicationName = server.ServerNames[0] |
|
196
|
|
|
appdesc.ApplicationType = server.ServerType |
|
197
|
1 |
|
appdesc.DiscoveryUrls = server.DiscoveryUrls |
|
198
|
1 |
|
# FIXME: select discovery uri using reachability from client network |
|
199
|
1 |
|
appdesc.GatewayServerUri = server.GatewayServerUri |
|
200
|
1 |
|
self._known_servers[server.ServerUri] = ServerDesc(appdesc, conf) |
|
201
|
|
|
|
|
202
|
1 |
|
def register_server2(self, params): |
|
203
|
|
|
return self.register_server(params.Server, params.DiscoveryConfiguration) |
|
204
|
|
|
|
|
205
|
|
|
def create_session(self, name, user=User.Anonymous, external=False): |
|
206
|
1 |
|
return InternalSession(self, self.aspace, self.subscription_service, name, user=user, external=external) |
|
207
|
1 |
|
|
|
208
|
1 |
|
def enable_history_data_change(self, node, period=timedelta(days=7), count=0): |
|
209
|
1 |
|
""" |
|
210
|
|
|
Set attribute Historizing of node to True and start storing data for history |
|
211
|
1 |
|
""" |
|
212
|
|
|
node.set_attribute(ua.AttributeIds.Historizing, ua.DataValue(True)) |
|
213
|
|
|
node.set_attr_bit(ua.AttributeIds.AccessLevel, ua.AccessLevel.HistoryRead) |
|
214
|
|
|
node.set_attr_bit(ua.AttributeIds.UserAccessLevel, ua.AccessLevel.HistoryRead) |
|
215
|
1 |
|
self.history_manager.historize_data_change(node, period, count) |
|
216
|
1 |
|
|
|
217
|
|
|
def disable_history_data_change(self, node): |
|
218
|
|
|
""" |
|
219
|
1 |
|
Set attribute Historizing of node to False and stop storing data for history |
|
220
|
1 |
|
""" |
|
221
|
1 |
|
node.set_attribute(ua.AttributeIds.Historizing, ua.DataValue(False)) |
|
222
|
|
|
node.unset_attr_bit(ua.AttributeIds.AccessLevel, ua.AccessLevel.HistoryRead) |
|
223
|
1 |
|
node.unset_attr_bit(ua.AttributeIds.UserAccessLevel, ua.AccessLevel.HistoryRead) |
|
224
|
|
|
self.history_manager.dehistorize(node) |
|
225
|
1 |
|
|
|
226
|
|
|
def enable_history_event(self, source, period=timedelta(days=7), count=0): |
|
227
|
|
|
""" |
|
228
|
|
|
Set attribute History Read of object events to True and start storing data for history |
|
229
|
1 |
|
""" |
|
230
|
1 |
|
event_notifier = source.get_event_notifier() |
|
231
|
|
|
if ua.EventNotifier.SubscribeToEvents not in event_notifier: |
|
232
|
1 |
|
raise ua.UaError("Node does not generate events", event_notifier) |
|
233
|
|
|
|
|
234
|
|
|
if ua.EventNotifier.HistoryRead not in event_notifier: |
|
235
|
|
|
event_notifier.add(ua.EventNotifier.HistoryRead) |
|
236
|
|
|
source.set_event_notifier(event_notifier) |
|
237
|
|
|
|
|
238
|
1 |
|
self.history_manager.historize_event(source, period, count) |
|
239
|
|
|
|
|
240
|
|
|
def disable_history_event(self, source): |
|
241
|
|
|
""" |
|
242
|
|
|
Set attribute History Read of node to False and stop storing data for history |
|
243
|
|
|
""" |
|
244
|
|
|
source.unset_attr_bit(ua.AttributeIds.EventNotifier, ua.EventNotifier.HistoryRead) |
|
245
|
1 |
|
self.history_manager.dehistorize(source) |
|
246
|
1 |
|
|
|
247
|
1 |
|
def subscribe_server_callback(self, event, handle): |
|
248
|
|
|
""" |
|
249
|
1 |
|
Create a subscription from event to handle |
|
250
|
1 |
|
""" |
|
251
|
1 |
|
self.server_callback_dispatcher.addListener(event, handle) |
|
252
|
1 |
|
|
|
253
|
1 |
|
def unsubscribe_server_callback(self, event, handle): |
|
254
|
1 |
|
""" |
|
255
|
1 |
|
Remove a subscription from event to handle |
|
256
|
1 |
|
""" |
|
257
|
1 |
|
self.server_callback_dispatcher.removeListener(event, handle) |
|
258
|
1 |
|
|
|
259
|
1 |
|
|
|
260
|
1 |
|
class InternalSession(object): |
|
261
|
1 |
|
_counter = 10 |
|
262
|
1 |
|
_auth_counter = 1000 |
|
263
|
1 |
|
|
|
264
|
1 |
|
def __init__(self, internal_server, aspace, submgr, name, user=User.Anonymous, external=False): |
|
265
|
1 |
|
self.logger = logging.getLogger(__name__) |
|
266
|
|
|
self.iserver = internal_server |
|
267
|
1 |
|
self.external = external # define if session is external, we need to copy some objects if it is internal |
|
268
|
|
|
self.aspace = aspace |
|
269
|
|
|
self.subscription_service = submgr |
|
270
|
|
|
self.name = name |
|
271
|
1 |
|
self.user = user |
|
272
|
1 |
|
self.nonce = None |
|
273
|
|
|
self.state = SessionState.Created |
|
274
|
1 |
|
self.session_id = ua.NodeId(self._counter) |
|
275
|
1 |
|
InternalSession._counter += 1 |
|
276
|
|
|
self.authentication_token = ua.NodeId(self._auth_counter) |
|
277
|
1 |
|
InternalSession._auth_counter += 1 |
|
278
|
1 |
|
self.subscriptions = [] |
|
279
|
1 |
|
self.logger.info("Created internal session %s", self.name) |
|
280
|
1 |
|
self._lock = Lock() |
|
281
|
1 |
|
|
|
282
|
1 |
|
def __str__(self): |
|
283
|
1 |
|
return "InternalSession(name:{0}, user:{1}, id:{2}, auth_token:{3})".format( |
|
284
|
1 |
|
self.name, self.user, self.session_id, self.authentication_token) |
|
285
|
|
|
|
|
286
|
1 |
|
def get_endpoints(self, params=None, sockname=None): |
|
287
|
|
|
return self.iserver.get_endpoints(params, sockname) |
|
288
|
1 |
|
|
|
289
|
1 |
|
def create_session(self, params, sockname=None): |
|
290
|
1 |
|
self.logger.info("Create session request") |
|
291
|
1 |
|
|
|
292
|
|
|
result = ua.CreateSessionResult() |
|
293
|
1 |
|
result.SessionId = self.session_id |
|
294
|
1 |
|
result.AuthenticationToken = self.authentication_token |
|
295
|
1 |
|
result.RevisedSessionTimeout = params.RequestedSessionTimeout |
|
296
|
1 |
|
result.MaxRequestMessageSize = 65536 |
|
297
|
|
|
self.nonce = utils.create_nonce(32) |
|
298
|
1 |
|
result.ServerNonce = self.nonce |
|
299
|
1 |
|
result.ServerEndpoints = self.get_endpoints(sockname=sockname) |
|
300
|
1 |
|
|
|
301
|
|
|
return result |
|
302
|
1 |
|
|
|
303
|
1 |
|
def close_session(self, delete_subs=True): |
|
304
|
1 |
|
self.logger.info("close session %s with subscriptions %s", self, self.subscriptions) |
|
305
|
1 |
|
self.state = SessionState.Closed |
|
306
|
1 |
|
self.delete_subscriptions(self.subscriptions[:]) |
|
307
|
1 |
|
|
|
308
|
1 |
|
def activate_session(self, params): |
|
309
|
|
|
self.logger.info("activate session") |
|
310
|
1 |
|
result = ua.ActivateSessionResult() |
|
311
|
1 |
|
if self.state != SessionState.Created: |
|
312
|
1 |
|
raise utils.ServiceError(ua.StatusCodes.BadSessionIdInvalid) |
|
313
|
1 |
|
self.nonce = utils.create_nonce(32) |
|
314
|
1 |
|
result.ServerNonce = self.nonce |
|
315
|
|
|
for _ in params.ClientSoftwareCertificates: |
|
316
|
1 |
|
result.Results.append(ua.StatusCode()) |
|
317
|
1 |
|
self.state = SessionState.Activated |
|
318
|
|
|
id_token = params.UserIdentityToken |
|
319
|
1 |
|
if isinstance(id_token, ua.UserNameIdentityToken): |
|
320
|
1 |
|
if self.iserver.allow_remote_admin and id_token.UserName in ("admin", "Admin"): |
|
321
|
|
|
self.user = User.Admin |
|
322
|
|
|
self.logger.info("Activated internal session %s for user %s", self.name, self.user) |
|
323
|
1 |
|
return result |
|
324
|
1 |
|
|
|
325
|
|
|
def read(self, params): |
|
326
|
1 |
|
results = self.iserver.attribute_service.read(params) |
|
327
|
1 |
|
if self.external: |
|
328
|
|
|
return results |
|
329
|
1 |
|
return [deepcopy(dv) for dv in results] |
|
330
|
1 |
|
|
|
331
|
|
|
def history_read(self, params): |
|
332
|
1 |
|
return self.iserver.history_manager.read_history(params) |
|
333
|
1 |
|
|
|
334
|
|
|
def write(self, params): |
|
335
|
1 |
|
if not self.external: |
|
336
|
1 |
|
# If session is internal we need to store a copy og object, not a reference, |
|
337
|
|
|
# otherwise users may change it and we will not generate expected events |
|
338
|
1 |
|
params.NodesToWrite = [deepcopy(ntw) for ntw in params.NodesToWrite] |
|
339
|
1 |
|
return self.iserver.attribute_service.write(params, self.user) |
|
340
|
|
|
|
|
341
|
1 |
|
def browse(self, params): |
|
342
|
|
|
return self.iserver.view_service.browse(params) |
|
343
|
|
|
|
|
344
|
1 |
|
def translate_browsepaths_to_nodeids(self, params): |
|
345
|
1 |
|
return self.iserver.view_service.translate_browsepaths_to_nodeids(params) |
|
346
|
|
|
|
|
347
|
1 |
|
def add_nodes(self, params): |
|
348
|
1 |
|
return self.iserver.node_mgt_service.add_nodes(params, self.user) |
|
349
|
|
|
|
|
350
|
1 |
|
def delete_nodes(self, params): |
|
351
|
1 |
|
return self.iserver.node_mgt_service.delete_nodes(params, self.user) |
|
352
|
1 |
|
|
|
353
|
1 |
|
def add_references(self, params): |
|
354
|
1 |
|
return self.iserver.node_mgt_service.add_references(params, self.user) |
|
355
|
|
|
|
|
356
|
1 |
|
def delete_references(self, params): |
|
357
|
1 |
|
return self.iserver.node_mgt_service.delete_references(params, self.user) |
|
358
|
1 |
|
|
|
359
|
|
|
def add_method_callback(self, methodid, callback): |
|
360
|
1 |
|
return self.aspace.add_method_callback(methodid, callback) |
|
361
|
|
|
|
|
362
|
1 |
|
def call(self, params): |
|
363
|
|
|
return self.iserver.method_service.call(params) |
|
364
|
|
|
|
|
365
|
|
|
def create_subscription(self, params, callback): |
|
366
|
|
|
result = self.subscription_service.create_subscription(params, callback) |
|
367
|
|
|
with self._lock: |
|
368
|
1 |
|
self.subscriptions.append(result.SubscriptionId) |
|
369
|
|
|
return result |
|
370
|
|
|
|
|
371
|
1 |
|
def create_monitored_items(self, params): |
|
372
|
1 |
|
subscription_result = self.subscription_service.create_monitored_items(params) |
|
373
|
1 |
|
self.iserver.server_callback_dispatcher.dispatch( |
|
374
|
1 |
|
CallbackType.ItemSubscriptionCreated, ServerItemCallback(params, subscription_result)) |
|
375
|
1 |
|
return subscription_result |
|
376
|
1 |
|
|
|
377
|
|
|
def modify_monitored_items(self, params): |
|
378
|
1 |
|
subscription_result = self.subscription_service.modify_monitored_items(params) |
|
379
|
1 |
|
self.iserver.server_callback_dispatcher.dispatch( |
|
380
|
1 |
|
CallbackType.ItemSubscriptionModified, ServerItemCallback(params, subscription_result)) |
|
381
|
|
|
return subscription_result |
|
382
|
1 |
|
|
|
383
|
|
|
def republish(self, params): |
|
384
|
1 |
|
return self.subscription_service.republish(params) |
|
385
|
1 |
|
|
|
386
|
1 |
|
def delete_subscriptions(self, ids): |
|
387
|
1 |
|
for i in ids: |
|
388
|
|
|
with self._lock: |
|
389
|
|
|
if i in self.subscriptions: |
|
390
|
|
|
self.subscriptions.remove(i) |
|
391
|
|
|
return self.subscription_service.delete_subscriptions(ids) |
|
392
|
|
|
|
|
393
|
|
|
def delete_monitored_items(self, params): |
|
394
|
|
|
subscription_result = self.subscription_service.delete_monitored_items(params) |
|
395
|
|
|
self.iserver.server_callback_dispatcher.dispatch( |
|
396
|
|
|
CallbackType.ItemSubscriptionDeleted, ServerItemCallback(params, subscription_result)) |
|
397
|
|
|
return subscription_result |
|
398
|
|
|
|
|
399
|
|
|
def publish(self, acks=None): |
|
400
|
|
|
if acks is None: |
|
401
|
|
|
acks = [] |
|
402
|
|
|
return self.subscription_service.publish(acks) |
|
403
|
|
|
|
FreeOpcUa /
python-opcua
