|
1
|
|
|
""" |
|
2
|
|
|
Socket server forwarding request to internal server |
|
3
|
|
|
""" |
|
4
|
|
|
import logging |
|
5
|
|
|
import asyncio |
|
6
|
|
|
from typing import Optional |
|
7
|
|
|
|
|
8
|
|
|
from ..ua.ua_binary import header_from_binary |
|
9
|
|
|
from ..common.utils import Buffer, NotEnoughData |
|
10
|
|
|
from .uaprocessor import UaProcessor |
|
11
|
|
|
from .internal_server import InternalServer |
|
12
|
|
|
|
|
13
|
|
|
logger = logging.getLogger(__name__) |
|
14
|
|
|
|
|
15
|
|
|
|
|
16
|
|
|
class OPCUAProtocol(asyncio.Protocol): |
|
17
|
|
|
""" |
|
18
|
|
|
Instantiated for every connection. |
|
19
|
|
|
""" |
|
20
|
|
|
|
|
21
|
|
|
def __init__(self, iserver: InternalServer, policies, clients, closing_tasks): |
|
22
|
|
|
self.peer_name = None |
|
23
|
|
|
self.transport = None |
|
24
|
|
|
self.processor = None |
|
25
|
|
|
self._buffer = b'' |
|
26
|
|
|
self.iserver: InternalServer = iserver |
|
27
|
|
|
self.policies = policies |
|
28
|
|
|
self.clients = clients |
|
29
|
|
|
self.closing_tasks = closing_tasks |
|
30
|
|
|
self.messages = asyncio.Queue() |
|
31
|
|
|
self._task = None |
|
32
|
|
|
|
|
33
|
|
|
def __str__(self): |
|
34
|
|
|
return f'OPCUAProtocol({self.peer_name}, {self.processor.session})' |
|
35
|
|
|
|
|
36
|
|
|
__repr__ = __str__ |
|
37
|
|
|
|
|
38
|
|
|
def connection_made(self, transport): |
|
39
|
|
|
self.peer_name = transport.get_extra_info('peername') |
|
40
|
|
|
logger.info('New connection from %s', self.peer_name) |
|
41
|
|
|
self.transport = transport |
|
42
|
|
|
self.processor = UaProcessor(self.iserver, self.transport) |
|
43
|
|
|
self.processor.set_policies(self.policies) |
|
44
|
|
|
self.iserver.asyncio_transports.append(transport) |
|
45
|
|
|
self.clients.append(self) |
|
46
|
|
|
self._task = self.iserver.loop.create_task(self._process_received_message_loop()) |
|
47
|
|
|
|
|
48
|
|
|
def connection_lost(self, ex): |
|
49
|
|
|
logger.info('Lost connection from %s, %s', self.peer_name, ex) |
|
50
|
|
|
self.transport.close() |
|
51
|
|
|
self.iserver.asyncio_transports.remove(self.transport) |
|
52
|
|
|
closing_task = self.iserver.loop.create_task(self.processor.close()) |
|
53
|
|
|
self.closing_tasks.append(closing_task) |
|
54
|
|
|
if self in self.clients: |
|
55
|
|
|
self.clients.remove(self) |
|
56
|
|
|
self.messages.put_nowait((None, None)) |
|
57
|
|
|
self._task.cancel() |
|
58
|
|
|
|
|
59
|
|
|
def data_received(self, data): |
|
60
|
|
|
self._buffer += data |
|
61
|
|
|
# try to parse the incoming data |
|
62
|
|
|
while self._buffer: |
|
63
|
|
|
try: |
|
64
|
|
|
buf = Buffer(self._buffer) |
|
65
|
|
|
try: |
|
66
|
|
|
header = header_from_binary(buf) |
|
67
|
|
|
except NotEnoughData: |
|
68
|
|
|
logger.debug('Not enough data while parsing header from client, waiting for more') |
|
69
|
|
|
return |
|
70
|
|
|
if len(buf) < header.body_size: |
|
71
|
|
|
logger.debug('We did not receive enough data from client. Need %s got %s', header.body_size, |
|
72
|
|
|
len(buf)) |
|
73
|
|
|
return |
|
74
|
|
|
# we have a complete message |
|
75
|
|
|
self.messages.put_nowait((header, buf)) |
|
76
|
|
|
self._buffer = self._buffer[(header.header_size + header.body_size):] |
|
77
|
|
|
except Exception: |
|
78
|
|
|
logger.exception('Exception raised while parsing message from client') |
|
79
|
|
|
return |
|
80
|
|
|
|
|
81
|
|
|
async def _process_received_message_loop(self): |
|
82
|
|
|
""" |
|
83
|
|
|
Take message from the queue and try to process it. |
|
84
|
|
|
""" |
|
85
|
|
|
while True: |
|
86
|
|
|
header, buf = await self.messages.get() |
|
87
|
|
|
if header is None and buf is None: |
|
88
|
|
|
# Connection was closed, end task |
|
89
|
|
|
break |
|
90
|
|
|
try: |
|
91
|
|
|
await self._process_one_msg(header, buf) |
|
92
|
|
|
except Exception: |
|
93
|
|
|
logger.exception('Exception raised while processing message from client') |
|
94
|
|
|
|
|
95
|
|
|
async def _process_one_msg(self, header, buf): |
|
96
|
|
|
logger.debug('_process_received_message %s %s', header.body_size, len(buf)) |
|
97
|
|
|
ret = await self.processor.process(header, buf) |
|
98
|
|
|
if not ret: |
|
99
|
|
|
logger.info('processor returned False, we close connection from %s', self.peer_name) |
|
100
|
|
|
self.transport.close() |
|
101
|
|
|
return |
|
102
|
|
|
|
|
103
|
|
|
|
|
104
|
|
|
class BinaryServer: |
|
105
|
|
|
def __init__(self, internal_server: InternalServer, hostname, port): |
|
106
|
|
|
self.logger = logging.getLogger(__name__) |
|
107
|
|
|
self.hostname = hostname |
|
108
|
|
|
self.port = port |
|
109
|
|
|
self.iserver: InternalServer = internal_server |
|
110
|
|
|
self._server: Optional[asyncio.AbstractServer] = None |
|
111
|
|
|
self._policies = [] |
|
112
|
|
|
self.clients = [] |
|
113
|
|
|
self.closing_tasks = [] |
|
114
|
|
|
|
|
115
|
|
|
def set_policies(self, policies): |
|
116
|
|
|
self._policies = policies |
|
117
|
|
|
|
|
118
|
|
|
def _make_protocol(self): |
|
119
|
|
|
"""Protocol Factory""" |
|
120
|
|
|
return OPCUAProtocol( |
|
121
|
|
|
iserver=self.iserver, |
|
122
|
|
|
policies=self._policies, |
|
123
|
|
|
clients=self.clients, |
|
124
|
|
|
closing_tasks=self.closing_tasks, |
|
125
|
|
|
) |
|
126
|
|
|
|
|
127
|
|
|
async def start(self): |
|
128
|
|
|
self._server = await self.iserver.loop.create_server(self._make_protocol, self.hostname, self.port) |
|
129
|
|
|
# get the port and the hostname from the created server socket |
|
130
|
|
|
# only relevant for dynamic port asignment (when self.port == 0) |
|
131
|
|
|
if self.port == 0 and len(self._server.sockets) == 1: |
|
132
|
|
|
# will work for AF_INET and AF_INET6 socket names |
|
133
|
|
|
# these are to only families supported by the create_server call |
|
134
|
|
|
sockname = self._server.sockets[0].getsockname() |
|
135
|
|
|
self.hostname = sockname[0] |
|
136
|
|
|
self.port = sockname[1] |
|
137
|
|
|
self.logger.info('Listening on %s:%s', self.hostname, self.port) |
|
138
|
|
|
await self._await_closing_tasks() |
|
139
|
|
|
|
|
140
|
|
|
async def stop(self): |
|
141
|
|
|
self.logger.info('Closing asyncio socket server') |
|
142
|
|
|
for transport in self.iserver.asyncio_transports: |
|
143
|
|
|
transport.close() |
|
144
|
|
|
|
|
145
|
|
|
# Wait for all transport closing tasks to complete |
|
146
|
|
|
results = await asyncio.gather(*self.closing_tasks, return_exceptions=True) |
|
147
|
|
|
for result in results: |
|
148
|
|
|
if isinstance(result, Exception): |
|
149
|
|
|
self.logger.error(f"An error ocurred while closing a transport: {result}") |
|
150
|
|
|
self.closing_tasks = [] |
|
151
|
|
|
|
|
152
|
|
|
if self._server: |
|
153
|
|
|
self.iserver.loop.call_soon(self._server.close) |
|
154
|
|
|
await self._server.wait_closed() |
|
155
|
|
|
|
|
156
|
|
|
async def _await_closing_tasks(self): |
|
157
|
|
|
await asyncio.sleep(10) |
|
158
|
|
|
while self.closing_tasks: |
|
159
|
|
|
task = self.closing_tasks.pop() |
|
160
|
|
|
try: |
|
161
|
|
|
await task |
|
162
|
|
|
except Exception: |
|
163
|
|
|
logger.exception("Unexpected crash in BinaryServer._await_closing_tasks") |
FreeOpcUa /
opcua-asyncio
