opcua.UASocketClient.close_secure_channel() - Code Metrics - Inspection of "Merge pull request #79 from alkor/message-chunks" - FreeOpcUa/python-opcua - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 558fdd...a80a7b )

by Olivier

created 2015-12-20 16:12 UTC

opcua.UASocketClient.close_secure_channel() A

↳ Parent: opcua.UASocketClient

Complexity

Conditions

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	2

Metric	Value
dl	0
loc	13
ccs	7
cts	7
cp	1
rs	9.4286
cc	2
crap	2

"""
Low level binary client
"""

import logging
import socket
from threading import Thread, Lock
from concurrent.futures import Future

import opcua.uaprotocol as ua
import opcua.utils as utils


class CachedRequest(object):
    def __init__(self, binary):
        self.binary = binary

    def to_binary(self):
        return self.binary


class UASocketClient(object):
    """
    handle socket connection and send ua messages
    timeout is the timeout used while waiting for an ua answer from server
    """
    def __init__(self, timeout=1, security_policy=ua.SecurityPolicy()):
        self.logger = logging.getLogger(__name__ + "Socket")
        self._thread = None
        self._lock = Lock()
        self.timeout = timeout
        self._socket = None
        self._do_stop = False
        self._security_token = ua.ChannelSecurityToken()
        self.authentication_token = ua.NodeId()
        self._sequence_number = 0
        self._request_id = 0
        self._request_handle = 0
        self._callbackmap = {}
        self._security_policy = security_policy
        self._max_chunk_size = 65536

    def start(self):
        """
        Start receiving thread.
        this is called automatically in connect and
        should not be necessary to call directly
        """
        self._thread = Thread(target=self._run)
        self._thread.start()

    def _send_request(self, request, callback=None, timeout=1000, message_type=ua.MessageType.SecureMessage):
        """
        send request to server, lower-level method
        timeout is the timeout written in ua header
        returns future
        """
        with self._lock:
            request.RequestHeader = self._create_request_header(timeout)
            try:
                binreq = request.to_binary()
            except:
                # reset reqeust handle if any error
                # see self._create_request_header
                self._request_handle -= 1
                raise
            self._request_id += 1
            future = Future()
            if callback:
                future.add_done_callback(callback)
            self._callbackmap[self._request_id] = future
            for chunk in ua.MessageChunk.message_to_chunks(self._security_policy, binreq, self._max_chunk_size,
                    message_type=message_type,
                    channel_id=self._security_token.ChannelId,
                    request_id=self._request_id,
                    token_id=self._security_token.TokenId):
                self._sequence_number += 1
                chunk.SequenceHeader.SequenceNumber = self._sequence_number
                self._socket.write(chunk.to_binary())
        return future

    def send_request(self, request, callback=None, timeout=1000, message_type=ua.MessageType.SecureMessage):
        """
        send request to server.
        timeout is the timeout written in ua header
        returns response object if no callback is provided
        """
        future = self._send_request(request, callback, timeout, message_type)
        if not callback:
            data = future.result(self.timeout)
            self.check_answer(data, " in response to " + request.__class__.__name__)
            return data

    def check_answer(self, data, context):
        data = data.copy(50)  # FIXME check max length nodeid + responseheader
        typeid = ua.NodeId.from_binary(data)
        if typeid == ua.FourByteNodeId(ua.ObjectIds.ServiceFault_Encoding_DefaultBinary):
            self.logger.warning("ServiceFault from server received %s", context)
            hdr = ua.ResponseHeader.from_binary(data)
            hdr.ServiceResult.check()
            return False
        return True

    def _run(self):
        self.logger.info("Thread started")
        while not self._do_stop:
            try:
                self._receive()
            except ua.utils.SocketClosedException:
                self.logger.info("Socket has closed connection")
                break
        self.logger.info("Thread ended")

    def _receive_header(self):
        self.logger.debug("Waiting for header")
        header = ua.Header.from_string(self._socket)
        self.logger.info("received header: %s", header)
        return header

    def _receive_body(self, size):
        self.logger.debug("reading body of message (%s bytes)", size)
        data = self._socket.read(size)
        if size != len(data):
            raise Exception("Error, did not receive expected number of bytes, got {}, asked for {}".format(len(data), size))
        return utils.Buffer(data)

    def _receive(self):
        body_chunk = b""
        while True:
            ret = self._receive_complete_msg()
            if ret is None:
                return
            hdr, algohdr, seqhdr, body = ret 
            if hdr.ChunkType in (b"F", b"A"):
                body.data = body_chunk + body.data
                break
            elif hdr.ChunkType == b"C":
                self.logger.debug("Received an intermediate message with header %s, waiting for next message", hdr)
                body_chunk += body.data
            else:
                self.logger.warning("Received a message with unknown ChunkType %s, in header %s", hdr.ChunkType, hdr)
                return
        self._call_callback(seqhdr.RequestId, body)

    def _receive_complete_msg(self):
        header = self._receive_header()
        if header is None:
            return None
        body = self._receive_body(header.body_size)
        if header.MessageType == ua.MessageType.Error:
            self.logger.warning("Received an error message type")
            err = ua.ErrorMessage.from_binary(body)
            self.logger.warning(err)
            return None
        if header.MessageType == ua.MessageType.Acknowledge:
            self._call_callback(0, body)
            return None
        elif header.MessageType == ua.MessageType.SecureOpen:
            algohdr = ua.AsymmetricAlgorithmHeader.from_binary(body)
            self.logger.info(algohdr)
        elif header.MessageType == ua.MessageType.SecureMessage:
            algohdr = ua.SymmetricAlgorithmHeader.from_binary(body)
            self.logger.info(algohdr)
        else:
            self.logger.warning("Unsupported message type: %s", header.MessageType)
            return None
        seqhdr = ua.SequenceHeader.from_binary(body)
        self.logger.debug(seqhdr)
        return header, algohdr, seqhdr, body

    def _call_callback(self, request_id, body):
        with self._lock:
            future = self._callbackmap.pop(request_id, None)
            if future is None:
                raise Exception("No future object found for request: {}, callbacks in list are {}".format(request_id, self._callbackmap.keys()))
        future.set_result(body)

    def _write_socket(self, hdr, *args):
        alle = []
        for arg in args:
            data = arg.to_binary()
            hdr.add_size(len(data))
            self.logger.debug("writting to socket: %s with length %s ", type(arg), len(data))
            self.logger.debug("struct: %s", arg)
            self.logger.debug("data: %s", data)
            alle.append(data)
        alle.insert(0, hdr.to_binary())
        alle = b"".join(alle)
        self._socket.write(alle)

    def _create_request_header(self, timeout=1000):
        hdr = ua.RequestHeader()
        hdr.AuthenticationToken = self.authentication_token
        self._request_handle += 1
        hdr.RequestHandle = self._request_handle
        hdr.TimeoutHint = timeout
        return hdr

    def connect_socket(self, host, port):
        """
        connect to server socket and start receiving thread
        """
        self.logger.info("opening connection")
        sock = socket.create_connection((host, port))
        sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)  # nodelay ncessary to avoid packing in one frame, some servers do not like it
        self._socket = utils.SocketWrapper(sock)
        self.start()

    def disconnect_socket(self):
        self.logger.info("stop request")
        self._do_stop = True
        self._socket.socket.shutdown(socket.SHUT_WR)

    def send_hello(self, url):
        hello = ua.Hello()
        hello.EndpointUrl = url
        header = ua.Header(ua.MessageType.Hello, ua.ChunkType.Single)
        future = Future()
        with self._lock:
            self._callbackmap[0] = future
        self._write_socket(header, hello)
        ack = ua.Acknowledge.from_binary(future.result(self.timeout))
        self._max_chunk_size = ack.SendBufferSize	# client shouldn't send chunks larger than this
        return ack

    def open_secure_channel(self, params):
        self.logger.info("open_secure_channel")
        request = ua.OpenSecureChannelRequest()
        request.Parameters = params
        future = self._send_request(request, message_type=ua.MessageType.SecureOpen)

        response = ua.OpenSecureChannelResponse.from_binary(future.result(self.timeout))
        response.ResponseHeader.ServiceResult.check()
        self._security_token = response.Parameters.SecurityToken
        return response.Parameters

    def close_secure_channel(self):
        """
        close secure channel. It seems to trigger a shutdown of socket
        in most servers, so be prepare to reconnect.
        OPC UA specs Part 6, 7.1.4 say that Server does not send a CloseSecureChannel response and should just close socket
        """
        self.logger.info("close_secure_channel")
        request = ua.CloseSecureChannelRequest()
        future = self._send_request(request, message_type=ua.MessageType.SecureClose)
        with self._lock:
            # don't expect any more answers
            future.cancel()
            self._callbackmap.clear()

        # some servers send a response here, most do not ... so we ignore



class BinaryClient(object):

    """
    low level OPC-UA client.
    implement all(well..one day) methods defined in opcua spec
    taking in argument the structures defined in opcua spec
    in python most of the structures are defined in
    uaprotocol_auto.py and uaprotocol_hand.py
    """

    def __init__(self, timeout=1):
        self.logger = logging.getLogger(__name__)
        self._publishcallbacks = {}
        self._lock = Lock()
        self._timeout = timeout
        self._uasocket = None

    def connect_socket(self, host, port):
        """
        connect to server socket and start receiving thread
        """
        self._uasocket = UASocketClient(self._timeout)
        return self._uasocket.connect_socket(host, port)

    def disconnect_socket(self):
        return self._uasocket.disconnect_socket()

    def send_hello(self, url):
        return self._uasocket.send_hello(url)

    def open_secure_channel(self, params):
        return self._uasocket.open_secure_channel(params)

    def close_secure_channel(self):
        """
        close secure channel. It seems to trigger a shutdown of socket
        in most servers, so be prepare to reconnect
        """
        return self._uasocket.close_secure_channel()

    def create_session(self, parameters):
        self.logger.info("create_session")
        request = ua.CreateSessionRequest()
        request.Parameters = parameters
        data = self._uasocket.send_request(request)
        response = ua.CreateSessionResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        self._uasocket.authentication_token = response.Parameters.AuthenticationToken
        return response.Parameters

    def activate_session(self, parameters):
        self.logger.info("activate_session")
        request = ua.ActivateSessionRequest()
        request.Parameters = parameters
        data = self._uasocket.send_request(request)
        response = ua.ActivateSessionResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Parameters

    def close_session(self, deletesubscriptions):
        self.logger.info("close_session")
        request = ua.CloseSessionRequest()
        request.DeleteSubscriptions = deletesubscriptions
        data = self._uasocket.send_request(request)
        ua.CloseSessionResponse.from_binary(data)
        # response.ResponseHeader.ServiceResult.check() #disabled, it seems we sent wrong session Id, but where is the sessionId supposed to be sent???

    def browse(self, parameters):
        self.logger.info("browse")
        request = ua.BrowseRequest()
        request.Parameters = parameters
        data = self._uasocket.send_request(request)
        response = ua.BrowseResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def read(self, parameters):
        self.logger.info("read")
        request = ua.ReadRequest()
        request.Parameters = parameters
        data = self._uasocket.send_request(request)
        response = ua.ReadResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def write(self, params):
        self.logger.info("read")
        request = ua.WriteRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.WriteResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def get_endpoints(self, params):
        self.logger.info("get_endpoint")
        request = ua.GetEndpointsRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.GetEndpointsResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Endpoints

    def find_servers(self, params):
        self.logger.info("find_servers")
        request = ua.FindServersRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.FindServersResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Servers

    def find_servers_on_network(self, params):
        self.logger.info("find_servers_on_network")
        request = ua.FindServersOnNetworkRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.FindServersOnNetworkResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Parameters

    def register_server(self, registered_server):
        self.logger.info("register_server")
        request = ua.RegisterServerRequest()
        request.Server = registered_server
        data = self._uasocket.send_request(request)
        response = ua.RegisterServerResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        # nothing to return for this service

    def register_server2(self, params):
        self.logger.info("register_server2")
        request = ua.RegisterServer2Request()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.RegisterServer2Response.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.ConfigurationResults

    def translate_browsepaths_to_nodeids(self, browsepaths):
        self.logger.info("translate_browsepath_to_nodeid")
        request = ua.TranslateBrowsePathsToNodeIdsRequest()
        request.Parameters.BrowsePaths = browsepaths
        data = self._uasocket.send_request(request)
        response = ua.TranslateBrowsePathsToNodeIdsResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def create_subscription(self, params, callback):
        self.logger.info("create_subscription")
        request = ua.CreateSubscriptionRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.CreateSubscriptionResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        with self._lock:
            self._publishcallbacks[response.Parameters.SubscriptionId] = callback
        return response.Parameters

    def delete_subscriptions(self, subscriptionids):
        self.logger.info("delete_subscription")
        request = ua.DeleteSubscriptionsRequest()
        request.Parameters.SubscriptionIds = subscriptionids
        data = self._uasocket.send_request(request)
        response = ua.DeleteSubscriptionsResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        for sid in subscriptionids:
            with self._lock:
                self._publishcallbacks.pop(sid)
        return response.Results

    def publish(self, acks=None):
        self.logger.info("publish")
        if acks is None:
            acks = []
        request = ua.PublishRequest()
        request.Parameters.SubscriptionAcknowledgements = acks
        self._uasocket.send_request(request, self._call_publish_callback, timeout=int(9e8))  # timeout could be set to 0 but some servers to not support it

    def _call_publish_callback(self, future):
        self.logger.info("call_publish_callback")
        data = future.result()
        self._uasocket.check_answer(data, "ServiceFault received from server while waiting for publish response")
        response = ua.PublishResponse.from_binary(data)
        with self._lock:
            if response.Parameters.SubscriptionId not in self._publishcallbacks:
                self.logger.warning("Received data for unknown subscription: %s ", response.Parameters.SubscriptionId)
                return
            callback = self._publishcallbacks[response.Parameters.SubscriptionId]
        try:
            callback(response.Parameters)
        except Exception:  # we call client code, catch everything!
            self.logger.exception("Exception while calling user callback: %s")

    def create_monitored_items(self, params):
        self.logger.info("create_monitored_items")
        request = ua.CreateMonitoredItemsRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.CreateMonitoredItemsResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def delete_monitored_items(self, params):
        self.logger.info("delete_monitored_items")
        request = ua.DeleteMonitoredItemsRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.DeleteMonitoredItemsResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def add_nodes(self, nodestoadd):
        self.logger.info("add_nodes")
        request = ua.AddNodesRequest()
        request.Parameters.NodesToAdd = nodestoadd
        data = self._uasocket.send_request(request)
        response = ua.AddNodesResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def call(self, methodstocall):
        request = ua.CallRequest()
        request.Parameters.MethodsToCall = methodstocall
        data = self._uasocket.send_request(request)
        response = ua.CallResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results

    def history_read(self, params):
        self.logger.info("history_read")
        request = ua.HistoryReadRequest()
        request.Parameters = params
        data = self._uasocket.send_request(request)
        response = ua.HistoryReadResponse.from_binary(data)
        response.ResponseHeader.ServiceResult.check()
        return response.Results


1		"""
2		Low level binary client
3		"""
4
5	1	import logging
6	1	import socket
7	1	from threading import Thread, Lock
8	1	from concurrent.futures import Future
9
10	1	import opcua.uaprotocol as ua
11	1	import opcua.utils as utils
12
13
14	1	class CachedRequest(object):
15	1	def __init__(self, binary):
16		self.binary = binary
17
18	1	def to_binary(self):
19		return self.binary
20
21
22	1	class UASocketClient(object):
23		"""
24		handle socket connection and send ua messages
25		timeout is the timeout used while waiting for an ua answer from server
26		"""
27	1	def __init__(self, timeout=1, security_policy=ua.SecurityPolicy()):
28	1	self.logger = logging.getLogger(__name__ + "Socket")
29	1	self._thread = None
30	1	self._lock = Lock()
31	1	self.timeout = timeout
32	1	self._socket = None
33	1	self._do_stop = False
34	1	self._security_token = ua.ChannelSecurityToken()
35	1	self.authentication_token = ua.NodeId()
36	1	self._sequence_number = 0
37	1	self._request_id = 0
38	1	self._request_handle = 0
39	1	self._callbackmap = {}
40	1	self._security_policy = security_policy
41	1	self._max_chunk_size = 65536
42
43	1	def start(self):
44		"""
45		Start receiving thread.
46		this is called automatically in connect and
47		should not be necessary to call directly
48		"""
49	1	self._thread = Thread(target=self._run)
50	1	self._thread.start()
51
52	1	def _send_request(self, request, callback=None, timeout=1000, message_type=ua.MessageType.SecureMessage):
53		"""
54		send request to server, lower-level method
55		timeout is the timeout written in ua header
56		returns future
57		"""
58	1	with self._lock:
59	1	request.RequestHeader = self._create_request_header(timeout)
60	1	try:
61	1	binreq = request.to_binary()
62		except:
63		# reset reqeust handle if any error
64		# see self._create_request_header
65		self._request_handle -= 1
66		raise
67	1	self._request_id += 1
68	1	future = Future()
69	1	if callback:
70	1	future.add_done_callback(callback)
71	1	self._callbackmap[self._request_id] = future
72	1	for chunk in ua.MessageChunk.message_to_chunks(self._security_policy, binreq, self._max_chunk_size,
73		message_type=message_type,
74		channel_id=self._security_token.ChannelId,
75		request_id=self._request_id,
76		token_id=self._security_token.TokenId):
77	1	self._sequence_number += 1
78	1	chunk.SequenceHeader.SequenceNumber = self._sequence_number
79	1	self._socket.write(chunk.to_binary())
80	1	return future
81
82	1	def send_request(self, request, callback=None, timeout=1000, message_type=ua.MessageType.SecureMessage):
83		"""
84		send request to server.
85		timeout is the timeout written in ua header
86		returns response object if no callback is provided
87		"""
88	1	future = self._send_request(request, callback, timeout, message_type)
89	1	if not callback:
90	1	data = future.result(self.timeout)
91	1	self.check_answer(data, " in response to " + request.__class__.__name__)
92	1	return data
93
94	1	def check_answer(self, data, context):
95	1	data = data.copy(50) # FIXME check max length nodeid + responseheader
96	1	typeid = ua.NodeId.from_binary(data)
97	1	if typeid == ua.FourByteNodeId(ua.ObjectIds.ServiceFault_Encoding_DefaultBinary):
98		self.logger.warning("ServiceFault from server received %s", context)
99		hdr = ua.ResponseHeader.from_binary(data)
100		hdr.ServiceResult.check()
101		return False
102	1	return True
103
104	1	def _run(self):
105	1	self.logger.info("Thread started")
106	1	while not self._do_stop:
107	1	try:
108	1	self._receive()
109	1	except ua.utils.SocketClosedException:
110	1	self.logger.info("Socket has closed connection")
111	1	break
112	1	self.logger.info("Thread ended")
113
114	1	def _receive_header(self):
115	1	self.logger.debug("Waiting for header")
116	1	header = ua.Header.from_string(self._socket)
117	1	self.logger.info("received header: %s", header)
118	1	return header
119
120	1	def _receive_body(self, size):
121	1	self.logger.debug("reading body of message (%s bytes)", size)
122	1	data = self._socket.read(size)
123	1	if size != len(data):
124		raise Exception("Error, did not receive expected number of bytes, got {}, asked for {}".format(len(data), size))
125	1	return utils.Buffer(data)
126
127	1	def _receive(self):
128	1	body_chunk = b""
129	1	while True:
130	1	ret = self._receive_complete_msg()
131	1	if ret is None:
132	1	return
133	1	hdr, algohdr, seqhdr, body = ret
134	1	if hdr.ChunkType in (b"F", b"A"):
135	1	body.data = body_chunk + body.data
136	1	break
137		elif hdr.ChunkType == b"C":
138		self.logger.debug("Received an intermediate message with header %s, waiting for next message", hdr)
139		body_chunk += body.data
140		else:
141		self.logger.warning("Received a message with unknown ChunkType %s, in header %s", hdr.ChunkType, hdr)
142		return
143	1	self._call_callback(seqhdr.RequestId, body)
144
145	1	def _receive_complete_msg(self):
146	1	header = self._receive_header()
147	1	if header is None:
148		return None
149	1	body = self._receive_body(header.body_size)
150	1	if header.MessageType == ua.MessageType.Error:
151		self.logger.warning("Received an error message type")
152		err = ua.ErrorMessage.from_binary(body)
153		self.logger.warning(err)
154		return None
155	1	if header.MessageType == ua.MessageType.Acknowledge:
156	1	self._call_callback(0, body)
157	1	return None
158	1	elif header.MessageType == ua.MessageType.SecureOpen:
159	1	algohdr = ua.AsymmetricAlgorithmHeader.from_binary(body)
160	1	self.logger.info(algohdr)
161	1	elif header.MessageType == ua.MessageType.SecureMessage:
162	1	algohdr = ua.SymmetricAlgorithmHeader.from_binary(body)
163	1	self.logger.info(algohdr)
164		else:
165		self.logger.warning("Unsupported message type: %s", header.MessageType)
166		return None
167	1	seqhdr = ua.SequenceHeader.from_binary(body)
168	1	self.logger.debug(seqhdr)
169	1	return header, algohdr, seqhdr, body
170
171	1	def _call_callback(self, request_id, body):
172	1	with self._lock:
173	1	future = self._callbackmap.pop(request_id, None)
174	1	if future is None:
175	1	raise Exception("No future object found for request: {}, callbacks in list are {}".format(request_id, self._callbackmap.keys()))
176	1	future.set_result(body)
177
178	1	def _write_socket(self, hdr, *args):
179	1	alle = []
180	1	for arg in args:
181	1	data = arg.to_binary()
182	1	hdr.add_size(len(data))
183	1	self.logger.debug("writting to socket: %s with length %s ", type(arg), len(data))
184	1	self.logger.debug("struct: %s", arg)
185	1	self.logger.debug("data: %s", data)
186	1	alle.append(data)
187	1	alle.insert(0, hdr.to_binary())
188	1	alle = b"".join(alle)
189	1	self._socket.write(alle)
190
191	1	def _create_request_header(self, timeout=1000):
192	1	hdr = ua.RequestHeader()
193	1	hdr.AuthenticationToken = self.authentication_token
194	1	self._request_handle += 1
195	1	hdr.RequestHandle = self._request_handle
196	1	hdr.TimeoutHint = timeout
197	1	return hdr
198
199	1	def connect_socket(self, host, port):
200		"""
201		connect to server socket and start receiving thread
202		"""
203	1	self.logger.info("opening connection")
204	1	sock = socket.create_connection((host, port))
205	1	sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1) # nodelay ncessary to avoid packing in one frame, some servers do not like it
206	1	self._socket = utils.SocketWrapper(sock)
207	1	self.start()
208
209	1	def disconnect_socket(self):
210	1	self.logger.info("stop request")
211	1	self._do_stop = True
212	1	self._socket.socket.shutdown(socket.SHUT_WR)
213
214	1	def send_hello(self, url):
215	1	hello = ua.Hello()
216	1	hello.EndpointUrl = url
217	1	header = ua.Header(ua.MessageType.Hello, ua.ChunkType.Single)
218	1	future = Future()
219	1	with self._lock:
220	1	self._callbackmap[0] = future
221	1	self._write_socket(header, hello)
222	1	ack = ua.Acknowledge.from_binary(future.result(self.timeout))
223	1	self._max_chunk_size = ack.SendBufferSize # client shouldn't send chunks larger than this
224	1	return ack
225
226	1	def open_secure_channel(self, params):
227	1	self.logger.info("open_secure_channel")
228	1	request = ua.OpenSecureChannelRequest()
229	1	request.Parameters = params
230	1	future = self._send_request(request, message_type=ua.MessageType.SecureOpen)
231
232	1	response = ua.OpenSecureChannelResponse.from_binary(future.result(self.timeout))
233	1	response.ResponseHeader.ServiceResult.check()
234	1	self._security_token = response.Parameters.SecurityToken
235	1	return response.Parameters
236
237	1	def close_secure_channel(self):
238		"""
239		close secure channel. It seems to trigger a shutdown of socket
240		in most servers, so be prepare to reconnect.
241		OPC UA specs Part 6, 7.1.4 say that Server does not send a CloseSecureChannel response and should just close socket
242		"""
243	1	self.logger.info("close_secure_channel")
244	1	request = ua.CloseSecureChannelRequest()
245	1	future = self._send_request(request, message_type=ua.MessageType.SecureClose)
246	1	with self._lock:
247		# don't expect any more answers
248	1	future.cancel()
249	1	self._callbackmap.clear()
250
251		# some servers send a response here, most do not ... so we ignore
252
253
254
255	1	class BinaryClient(object):
256
257		"""
258		low level OPC-UA client.
259		implement all(well..one day) methods defined in opcua spec
260		taking in argument the structures defined in opcua spec
261		in python most of the structures are defined in
262		uaprotocol_auto.py and uaprotocol_hand.py
263		"""
264
265	1	def __init__(self, timeout=1):
266	1	self.logger = logging.getLogger(__name__)
267	1	self._publishcallbacks = {}
268	1	self._lock = Lock()
269	1	self._timeout = timeout
270	1	self._uasocket = None
271
272	1	def connect_socket(self, host, port):
273		"""
274		connect to server socket and start receiving thread
275		"""
276	1	self._uasocket = UASocketClient(self._timeout)
277	1	return self._uasocket.connect_socket(host, port)
278
279	1	def disconnect_socket(self):
280	1	return self._uasocket.disconnect_socket()
281
282	1	def send_hello(self, url):
283	1	return self._uasocket.send_hello(url)
284
285	1	def open_secure_channel(self, params):
286	1	return self._uasocket.open_secure_channel(params)
287
288	1	def close_secure_channel(self):
289		"""
290		close secure channel. It seems to trigger a shutdown of socket
291		in most servers, so be prepare to reconnect
292		"""
293	1	return self._uasocket.close_secure_channel()
294
295	1	def create_session(self, parameters):
296	1	self.logger.info("create_session")
297	1	request = ua.CreateSessionRequest()
298	1	request.Parameters = parameters
299	1	data = self._uasocket.send_request(request)
300	1	response = ua.CreateSessionResponse.from_binary(data)
301	1	response.ResponseHeader.ServiceResult.check()
302	1	self._uasocket.authentication_token = response.Parameters.AuthenticationToken
303	1	return response.Parameters
304
305	1	def activate_session(self, parameters):
306	1	self.logger.info("activate_session")
307	1	request = ua.ActivateSessionRequest()
308	1	request.Parameters = parameters
309	1	data = self._uasocket.send_request(request)
310	1	response = ua.ActivateSessionResponse.from_binary(data)
311	1	response.ResponseHeader.ServiceResult.check()
312	1	return response.Parameters
313
314	1	def close_session(self, deletesubscriptions):
315	1	self.logger.info("close_session")
316	1	request = ua.CloseSessionRequest()
317	1	request.DeleteSubscriptions = deletesubscriptions
318	1	data = self._uasocket.send_request(request)
319	1	ua.CloseSessionResponse.from_binary(data)
320		# response.ResponseHeader.ServiceResult.check() #disabled, it seems we sent wrong session Id, but where is the sessionId supposed to be sent???
321
322	1	def browse(self, parameters):
323	1	self.logger.info("browse")
324	1	request = ua.BrowseRequest()
325	1	request.Parameters = parameters
326	1	data = self._uasocket.send_request(request)
327	1	response = ua.BrowseResponse.from_binary(data)
328	1	response.ResponseHeader.ServiceResult.check()
329	1	return response.Results
330
331	1	def read(self, parameters):
332	1	self.logger.info("read")
333	1	request = ua.ReadRequest()
334	1	request.Parameters = parameters
335	1	data = self._uasocket.send_request(request)
336	1	response = ua.ReadResponse.from_binary(data)
337	1	response.ResponseHeader.ServiceResult.check()
338	1	return response.Results
339
340	1	def write(self, params):
341	1	self.logger.info("read")
342	1	request = ua.WriteRequest()
343	1	request.Parameters = params
344	1	data = self._uasocket.send_request(request)
345	1	response = ua.WriteResponse.from_binary(data)
346	1	response.ResponseHeader.ServiceResult.check()
347	1	return response.Results
348
349	1	def get_endpoints(self, params):
350	1	self.logger.info("get_endpoint")
351	1	request = ua.GetEndpointsRequest()
352	1	request.Parameters = params
353	1	data = self._uasocket.send_request(request)
354	1	response = ua.GetEndpointsResponse.from_binary(data)
355	1	response.ResponseHeader.ServiceResult.check()
356	1	return response.Endpoints
357
358	1	def find_servers(self, params):
359	1	self.logger.info("find_servers")
360	1	request = ua.FindServersRequest()
361	1	request.Parameters = params
362	1	data = self._uasocket.send_request(request)
363	1	response = ua.FindServersResponse.from_binary(data)
364	1	response.ResponseHeader.ServiceResult.check()
365	1	return response.Servers
366
367	1	def find_servers_on_network(self, params):
368		self.logger.info("find_servers_on_network")
369		request = ua.FindServersOnNetworkRequest()
370		request.Parameters = params
371		data = self._uasocket.send_request(request)
372		response = ua.FindServersOnNetworkResponse.from_binary(data)
373		response.ResponseHeader.ServiceResult.check()
374		return response.Parameters
375
376	1	def register_server(self, registered_server):
377	1	self.logger.info("register_server")
378	1	request = ua.RegisterServerRequest()
379	1	request.Server = registered_server
380	1	data = self._uasocket.send_request(request)
381	1	response = ua.RegisterServerResponse.from_binary(data)
382	1	response.ResponseHeader.ServiceResult.check()
383		# nothing to return for this service
384
385	1	def register_server2(self, params):
386		self.logger.info("register_server2")
387		request = ua.RegisterServer2Request()
388		request.Parameters = params
389		data = self._uasocket.send_request(request)
390		response = ua.RegisterServer2Response.from_binary(data)
391		response.ResponseHeader.ServiceResult.check()
392		return response.ConfigurationResults
393
394	1	def translate_browsepaths_to_nodeids(self, browsepaths):
395	1	self.logger.info("translate_browsepath_to_nodeid")
396	1	request = ua.TranslateBrowsePathsToNodeIdsRequest()
397	1	request.Parameters.BrowsePaths = browsepaths
398	1	data = self._uasocket.send_request(request)
399	1	response = ua.TranslateBrowsePathsToNodeIdsResponse.from_binary(data)
400	1	response.ResponseHeader.ServiceResult.check()
401	1	return response.Results
402
403	1	def create_subscription(self, params, callback):
404	1	self.logger.info("create_subscription")
405	1	request = ua.CreateSubscriptionRequest()
406	1	request.Parameters = params
407	1	data = self._uasocket.send_request(request)
408	1	response = ua.CreateSubscriptionResponse.from_binary(data)
409	1	response.ResponseHeader.ServiceResult.check()
410	1	with self._lock:
411	1	self._publishcallbacks[response.Parameters.SubscriptionId] = callback
412	1	return response.Parameters
413
414	1	def delete_subscriptions(self, subscriptionids):
415	1	self.logger.info("delete_subscription")
416	1	request = ua.DeleteSubscriptionsRequest()
417	1	request.Parameters.SubscriptionIds = subscriptionids
418	1	data = self._uasocket.send_request(request)
419	1	response = ua.DeleteSubscriptionsResponse.from_binary(data)
420	1	response.ResponseHeader.ServiceResult.check()
421	1	for sid in subscriptionids:
422	1	with self._lock:
423	1	self._publishcallbacks.pop(sid)
424	1	return response.Results
425
426	1	def publish(self, acks=None):
427	1	self.logger.info("publish")
428	1	if acks is None:
429	1	acks = []
430	1	request = ua.PublishRequest()
431	1	request.Parameters.SubscriptionAcknowledgements = acks
432	1	self._uasocket.send_request(request, self._call_publish_callback, timeout=int(9e8)) # timeout could be set to 0 but some servers to not support it
433
434	1	def _call_publish_callback(self, future):
435	1	self.logger.info("call_publish_callback")
436	1	data = future.result()
437	1	self._uasocket.check_answer(data, "ServiceFault received from server while waiting for publish response")
438	1	response = ua.PublishResponse.from_binary(data)
439	1	with self._lock:
440	1	if response.Parameters.SubscriptionId not in self._publishcallbacks:
441	1	self.logger.warning("Received data for unknown subscription: %s ", response.Parameters.SubscriptionId)
442	1	return
443	1	callback = self._publishcallbacks[response.Parameters.SubscriptionId]
444	1	try:
445	1	callback(response.Parameters)
446		except Exception: # we call client code, catch everything!
447		self.logger.exception("Exception while calling user callback: %s")
448
449	1	def create_monitored_items(self, params):
450	1	self.logger.info("create_monitored_items")
451	1	request = ua.CreateMonitoredItemsRequest()
452	1	request.Parameters = params
453	1	data = self._uasocket.send_request(request)
454	1	response = ua.CreateMonitoredItemsResponse.from_binary(data)
455	1	response.ResponseHeader.ServiceResult.check()
456	1	return response.Results
457
458	1	def delete_monitored_items(self, params):
459	1	self.logger.info("delete_monitored_items")
460	1	request = ua.DeleteMonitoredItemsRequest()
461	1	request.Parameters = params
462	1	data = self._uasocket.send_request(request)
463	1	response = ua.DeleteMonitoredItemsResponse.from_binary(data)
464	1	response.ResponseHeader.ServiceResult.check()
465	1	return response.Results
466
467	1	def add_nodes(self, nodestoadd):
468	1	self.logger.info("add_nodes")
469	1	request = ua.AddNodesRequest()
470	1	request.Parameters.NodesToAdd = nodestoadd
471	1	data = self._uasocket.send_request(request)
472	1	response = ua.AddNodesResponse.from_binary(data)
473	1	response.ResponseHeader.ServiceResult.check()
474	1	return response.Results
475
476	1	def call(self, methodstocall):
477	1	request = ua.CallRequest()
478	1	request.Parameters.MethodsToCall = methodstocall
479	1	data = self._uasocket.send_request(request)
480	1	response = ua.CallResponse.from_binary(data)
481	1	response.ResponseHeader.ServiceResult.check()
482	1	return response.Results
483
484	1	def history_read(self, params):
485		self.logger.info("history_read")
486		request = ua.HistoryReadRequest()
487		request.Parameters = params
488		data = self._uasocket.send_request(request)
489		response = ua.HistoryReadResponse.from_binary(data)
490		response.ResponseHeader.ServiceResult.check()
491		return response.Results
492

FreeOpcUa / python-opcua

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opcua.UASocketClient.close_secure_channel() A

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