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""" |
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Internal server implementing opcu-ua interface. can be used on server side or to implement binary/https opc-ua servers |
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""" |
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5
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from datetime import datetime |
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from copy import copy, deepcopy |
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7
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import logging |
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8
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from threading import Lock |
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9
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from enum import Enum |
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10
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try: |
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11
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from urllib.parse import urlparse |
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except ImportError: |
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from urlparse import urlparse |
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14
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15
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16
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from opcua import ua |
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from opcua.common import utils |
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from opcua.common.node import Node |
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19
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from opcua.server.address_space import AddressSpace |
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from opcua.server.address_space import AttributeService |
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21
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from opcua.server.address_space import ViewService |
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from opcua.server.address_space import NodeManagementService |
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from opcua.server.address_space import MethodService |
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from opcua.server.subscription_service import SubscriptionService |
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from opcua.server.standard_address_space import standard_address_space |
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from opcua.server.users import User |
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from opcua.common import xmlimporter |
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30
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class SessionState(Enum): |
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Created = 0 |
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Activated = 1 |
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Closed = 2 |
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class ServerDesc(object): |
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def __init__(self, serv, cap=None): |
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self.Server = serv |
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self.Capabilities = cap |
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42
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class InternalServer(object): |
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def __init__(self): |
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self.logger = logging.getLogger(__name__) |
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self.endpoints = [] |
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self._channel_id_counter = 5 |
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self.allow_remote_admin = True |
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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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self._known_servers = {} # used if we are a discovery server |
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51
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52
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self.aspace = AddressSpace() |
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53
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self.attribute_service = AttributeService(self.aspace) |
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self.view_service = ViewService(self.aspace) |
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55
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self.method_service = MethodService(self.aspace) |
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56
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self.node_mgt_service = NodeManagementService(self.aspace) |
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# import address space from code generated from xml |
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standard_address_space.fill_address_space(self.node_mgt_service) |
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59
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# import address space from save db to disc |
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60
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#standard_address_space.fill_address_space_from_disk(self.aspace) |
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62
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# import address space directly from xml, this has preformance impact so disabled |
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63
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#importer = xmlimporter.XmlImporter(self.node_mgt_service) |
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64
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#importer.import_xml("/home/olivier/python-opcua/schemas/Opc.Ua.NodeSet2.xml") |
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65
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66
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self.loop = utils.ThreadLoop() |
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67
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self.asyncio_transports = [] |
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self.subscription_service = SubscriptionService(self.loop, self.aspace) |
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70
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# create a session to use on server side |
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self.isession = InternalSession(self, self.aspace, self.subscription_service, "Internal", user=User.Admin) |
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72
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self.current_time_node = Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_CurrentTime)) |
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uries = ["http://opcfoundation.org/UA/"] |
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ns_node = Node(self.isession, ua.NodeId(ua.ObjectIds.Server_NamespaceArray)) |
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ns_node.set_value(uries) |
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def load_address_space(self, path): |
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self.aspace.load(path) |
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80
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def dump_address_space(self, path): |
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81
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self.aspace.dump(path) |
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82
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83
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def start(self): |
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self.logger.info("starting internal server") |
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85
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for edp in self.endpoints: |
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86
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self._known_servers[edp.Server.ApplicationUri] = ServerDesc(edp.Server) |
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87
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self.loop.start() |
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88
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Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_State)).set_value(0) |
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89
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Node(self.isession, ua.NodeId(ua.ObjectIds.Server_ServerStatus_StartTime)).set_value(datetime.utcnow()) |
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90
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if not self.disabled_clock: |
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91
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self._set_current_time() |
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92
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93
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def stop(self): |
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self.logger.info("stopping internal server") |
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95
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self.loop.stop() |
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96
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97
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def _set_current_time(self): |
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98
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self.current_time_node.set_value(datetime.utcnow()) |
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self.loop.call_later(1, self._set_current_time) |
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100
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101
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def get_new_channel_id(self): |
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102
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self._channel_id_counter += 1 |
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103
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return self._channel_id_counter |
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104
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105
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def add_endpoint(self, endpoint): |
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self.endpoints.append(endpoint) |
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108
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def get_endpoints(self, params=None, sockname=None): |
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self.logger.info("get endpoint") |
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if sockname: |
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#return to client the ip address it has access to |
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edps = [] |
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for edp in self.endpoints: |
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edp1 = copy(edp) |
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url = urlparse(edp1.EndpointUrl) |
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116
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url = url._replace(netloc=sockname[0] + ":" + str(sockname[1])) |
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117
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edp1.EndpointUrl = url.geturl() |
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118
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edps.append(edp1) |
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119
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return edps |
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120
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return self.endpoints[:] |
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122
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1 |
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def find_servers(self, params): |
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1 |
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if not params.ServerUris: |
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return [desc.Server for desc in self._known_servers.values()] |
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125
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servers = [] |
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126
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1 |
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for serv in self._known_servers.values(): |
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serv_uri = serv.Server.ApplicationUri.split(":") |
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for uri in params.ServerUris: |
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uri = uri.split(":") |
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if serv_uri[:len(uri)] == uri: |
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servers.append(serv.Server) |
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break |
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return servers |
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135
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def register_server(self, server, conf=None): |
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appdesc = ua.ApplicationDescription() |
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appdesc.ApplicationUri = server.ServerUri |
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appdesc.ProductUri = server.ProductUri |
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139
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appdesc.ApplicationName = server.ServerNames[0] # FIXME: select name from client locale |
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140
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appdesc.ApplicationType = server.ServerType |
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141
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appdesc.GatewayServerUri = server.GatewayServerUri |
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142
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appdesc.DiscoveryUrls = server.DiscoveryUrls # FIXME: select discovery uri using reachability from client network |
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143
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1 |
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self._known_servers[server.ServerUri] = ServerDesc(appdesc, conf) |
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144
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145
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1 |
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def register_server2(self, params): |
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146
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return self.register_server(params.Server, params.DiscoveryConfiguration) |
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147
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148
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1 |
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def create_session(self, name, user=User.Anonymous, external=False): |
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149
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return InternalSession(self, self.aspace, self.subscription_service, name, user=user, external=external) |
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150
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151
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152
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1 |
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class InternalSession(object): |
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153
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_counter = 10 |
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154
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1 |
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_auth_counter = 1000 |
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155
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156
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1 |
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def __init__(self, internal_server, aspace, submgr, name, user=User.Anonymous, external=False): |
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157
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self.logger = logging.getLogger(__name__) |
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158
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1 |
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self.iserver = internal_server |
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159
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1 |
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self.external = external # define if session is external, we need to copy some objects if it is internal |
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160
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1 |
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self.aspace = aspace |
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161
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1 |
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self.subscription_service = submgr |
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162
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1 |
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self.name = name |
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163
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1 |
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self.user = user |
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164
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1 |
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self.nonce = None |
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165
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1 |
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self.state = SessionState.Created |
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166
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1 |
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self.session_id = ua.NodeId(self._counter) |
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167
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1 |
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InternalSession._counter += 1 |
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168
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1 |
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self.authentication_token = ua.NodeId(self._auth_counter) |
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169
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1 |
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InternalSession._auth_counter += 1 |
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170
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1 |
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self.subscriptions = [] |
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171
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1 |
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self.logger.info("Created internal session %s", self.name) |
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172
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1 |
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self._lock = Lock() |
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173
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174
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1 |
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def __str__(self): |
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175
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return "InternalSession(name:{}, user:{}, id:{}, auth_token:{})".format(self.name, self.user, self.session_id, self.authentication_token) |
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176
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177
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1 |
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def get_endpoints(self, params=None, sockname=None): |
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178
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1 |
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return self.iserver.get_endpoints(params, sockname) |
|
179
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|
180
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1 |
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def create_session(self, params, sockname=None): |
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181
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1 |
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self.logger.info("Create session request") |
|
182
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|
183
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1 |
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result = ua.CreateSessionResult() |
|
184
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1 |
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result.SessionId = self.session_id |
|
185
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1 |
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result.AuthenticationToken = self.authentication_token |
|
186
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1 |
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result.RevisedSessionTimeout = params.RequestedSessionTimeout |
|
187
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1 |
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result.MaxRequestMessageSize = 65536 |
|
188
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1 |
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self.nonce = utils.create_nonce(32) |
|
189
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1 |
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result.ServerNonce = self.nonce |
|
190
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1 |
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result.ServerEndpoints = self.get_endpoints(sockname=sockname) |
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191
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192
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1 |
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return result |
|
193
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|
194
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1 |
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def close_session(self, delete_subs): |
|
195
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1 |
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self.logger.info("close session %s with subscriptions %s", self, self.subscriptions) |
|
196
|
1 |
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self.state = SessionState.Closed |
|
197
|
1 |
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self.delete_subscriptions(self.subscriptions[:]) |
|
198
|
|
|
|
|
199
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1 |
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def activate_session(self, params): |
|
200
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1 |
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self.logger.info("activate session") |
|
201
|
1 |
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result = ua.ActivateSessionResult() |
|
202
|
1 |
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if self.state != SessionState.Created: |
|
203
|
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raise utils.ServiceError(ua.StatusCodes.BadSessionIdInvalid) |
|
204
|
1 |
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self.nonce = utils.create_nonce(32) |
|
205
|
1 |
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result.ServerNonce = self.nonce |
|
206
|
1 |
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for _ in params.ClientSoftwareCertificates: |
|
207
|
|
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result.Results.append(ua.StatusCode()) |
|
208
|
1 |
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self.state = SessionState.Activated |
|
209
|
1 |
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id_token = params.UserIdentityToken |
|
210
|
1 |
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if isinstance(id_token, ua.UserNameIdentityToken): |
|
211
|
1 |
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if self.iserver.allow_remote_admin and id_token.UserName in ("admin", "Admin"): |
|
212
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1 |
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self.user = User.Admin |
|
213
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1 |
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self.logger.info("Activated internal session %s for user %s", self.name, self.user) |
|
214
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1 |
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return result |
|
215
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|
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|
|
216
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1 |
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def read(self, params): |
|
217
|
1 |
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results = self.iserver.attribute_service.read(params) |
|
218
|
1 |
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if self.external: |
|
219
|
1 |
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return results |
|
220
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1 |
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return [deepcopy(dv) for dv in results] |
|
221
|
|
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|
|
222
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1 |
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def write(self, params): |
|
223
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1 |
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if not self.external: |
|
224
|
|
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# If session is internal we need to store a copy og object, not a reference, |
|
225
|
|
|
#otherwise users may change it and we will not generate expected events |
|
226
|
1 |
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params.NodesToWrite = [deepcopy(ntw) for ntw in params.NodesToWrite] |
|
227
|
1 |
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return self.iserver.attribute_service.write(params, self.user) |
|
228
|
|
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|
|
229
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1 |
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def browse(self, params): |
|
230
|
1 |
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return self.iserver.view_service.browse(params) |
|
231
|
|
|
|
|
232
|
1 |
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def translate_browsepaths_to_nodeids(self, params): |
|
233
|
1 |
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return self.iserver.view_service.translate_browsepaths_to_nodeids(params) |
|
234
|
|
|
|
|
235
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1 |
|
def add_nodes(self, params): |
|
236
|
1 |
|
return self.iserver.node_mgt_service.add_nodes(params, self.user) |
|
237
|
|
|
|
|
238
|
1 |
|
def delete_nodes(self, params): |
|
239
|
1 |
|
return self.iserver.node_mgt_service.delete_nodes(params, self.user) |
|
240
|
|
|
|
|
241
|
1 |
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def add_references(self, params): |
|
242
|
|
|
return self.iserver.node_mgt_service.add_references(params, self.user) |
|
243
|
|
|
|
|
244
|
1 |
|
def delete_references(self, params): |
|
245
|
|
|
return self.iserver.node_mgt_service.delete_references(params, self.user) |
|
246
|
|
|
|
|
247
|
1 |
|
def add_method_callback(self, methodid, callback): |
|
248
|
1 |
|
return self.aspace.add_method_callback(methodid, callback) |
|
249
|
|
|
|
|
250
|
1 |
|
def call(self, params): |
|
251
|
1 |
|
return self.iserver.method_service.call(params) |
|
252
|
|
|
|
|
253
|
1 |
|
def create_subscription(self, params, callback): |
|
254
|
1 |
|
result = self.subscription_service.create_subscription(params, callback) |
|
255
|
1 |
|
with self._lock: |
|
256
|
1 |
|
self.subscriptions.append(result.SubscriptionId) |
|
257
|
1 |
|
return result |
|
258
|
|
|
|
|
259
|
1 |
|
def create_monitored_items(self, params): |
|
260
|
1 |
|
return self.subscription_service.create_monitored_items(params) |
|
261
|
|
|
|
|
262
|
1 |
|
def modify_monitored_items(self, params): |
|
263
|
|
|
return self.subscription_service.modify_monitored_items(params) |
|
264
|
|
|
|
|
265
|
1 |
|
def republish(self, params): |
|
266
|
|
|
return self.subscription_service.republish(params) |
|
267
|
|
|
|
|
268
|
1 |
|
def delete_subscriptions(self, ids): |
|
269
|
1 |
|
for i in ids: |
|
270
|
1 |
|
with self._lock: |
|
271
|
1 |
|
if i in self.subscriptions: |
|
272
|
1 |
|
self.subscriptions.remove(i) |
|
273
|
1 |
|
return self.subscription_service.delete_subscriptions(ids) |
|
274
|
|
|
|
|
275
|
1 |
|
def delete_monitored_items(self, params): |
|
276
|
1 |
|
return self.subscription_service.delete_monitored_items(params) |
|
277
|
|
|
|
|
278
|
1 |
|
def publish(self, acks=None): |
|
279
|
1 |
|
if acks is None: |
|
280
|
1 |
|
acks = [] |
|
281
|
|
|
return self.subscription_service.publish(acks) |
|
282
|
|
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|
FreeOpcUa /
python-opcua
