File: mock_device.py

package info (click to toggle)
python-aioraven 0.7.0-1
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 216 kB
  • sloc: python: 2,428; makefile: 5
file content (293 lines) | stat: -rw-r--r-- 9,609 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
# Copyright 2022 Scott K Logan
# Licensed under the Apache License, Version 2.0

import asyncio
from collections.abc import AsyncIterator
from collections.abc import Awaitable
from collections.abc import MutableMapping
from contextlib import asynccontextmanager
import os
import sys
from typing import BinaryIO
from typing import Optional
from typing import SupportsIndex
from typing import TypeVar
from typing import Union

import serial_asyncio_fast


_T = TypeVar('_T')


class _NoPopList(list[_T]):

    def pop(self, index: SupportsIndex = -1) -> _T:
        return self[index]


_ResponseMapping = MutableMapping[bytes, Optional[Union[list[bytes], bytes]]]

DEFAULT_RESPONSES: _ResponseMapping = {
    b'<Command>'
    b'<Name>get_current_price</Name>'
    b'<MeterMacId>0xFEDCBA9876543210</MeterMacId>'
    b'</Command>': _NoPopList((
        b'<PriceCluster>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <MeterMacId>0xFEDCBA9876543210</MeterMacId>'
        b'    <TimeStamp>0x29bd58a7</TimeStamp>'
        b'    <Price>0xc7</Price>'
        b'    <Currency>0x348</Currency>'
        b'    <TrailingDigits>0x03</TrailingDigits>'
        b'    <Tier>0x08</Tier>'
        b'    <TierLabel>Set by User</TierLabel>'
        b'    <RateLabel>Set by User</RateLabel>'
        b'</PriceCluster>',
    )),
    b'<Command>'
    b'<Name>get_current_summation_delivered</Name>'
    b'<MeterMacId>0xFEDCBA9876543210</MeterMacId>'
    b'</Command>': _NoPopList((
        b'<CurrentSummationDelivered>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <MeterMacId>0xFEDCBA9876543210</MeterMacId>'
        b'    <TimeStamp>0x29bd58a7</TimeStamp>'
        b'    <SummationDelivered>0x00000010</SummationDelivered>'
        b'    <SummationReceived>0x00000008</SummationReceived>'
        b'    <Multiplier>0x00000004</Multiplier>'
        b'    <Divisor>0x00000002</Divisor>'
        b'    <DigitsRight>0x02</DigitsRight>'
        b'    <DigitsLeft>0x04</DigitsLeft>'
        b'    <SuppressLeadingZero>N</SuppressLeadingZero>'
        b'</CurrentSummationDelivered>',
    )),
    b'<Command>'
    b'<Name>get_device_info</Name>'
    b'</Command>': _NoPopList((
        b'<DeviceInfo>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <InstallCode>0xABCDEF0123456789</InstallCode>'
        b'    <LinkKey>0xABCDEF0123456789ABCDEF0123456789</LinkKey>'
        b'    <FWVersion>1.21g</FWVersion>'
        b'    <HWVersion>5.55 rev 2</HWVersion>'
        b'    <ImageType>Mocked</ImageType>'
        b'    <Manufacturer>aioraven</Manufacturer>'
        b'    <ModelId>mock device</ModelId>'
        b'    <DateCode>20220101a0000042</DateCode>'
        b'</DeviceInfo>',
    )),
    b'<Command>'
    b'<Name>get_instantaneous_demand</Name>'
    b'<MeterMacId>0xFEDCBA9876543210</MeterMacId>'
    b'</Command>': _NoPopList((
        b'<InstantaneousDemand>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <MeterMacId>0xFEDCBA9876543210</MeterMacId>'
        b'    <TimeStamp>0x29bd58a7</TimeStamp>'
        b'    <Demand>0x00000010</Demand>'
        b'    <Multiplier>0x00000004</Multiplier>'
        b'    <Divisor>0x00000002</Divisor>'
        b'    <DigitsRight>0x02</DigitsRight>'
        b'    <DigitsLeft>0x04</DigitsLeft>'
        b'    <SuppressLeadingZero>Y</SuppressLeadingZero>'
        b'</InstantaneousDemand>',
    )),
    b'<Command>'
    b'<Name>get_meter_info</Name>'
    b'<MeterMacId>0xFEDCBA9876543210</MeterMacId>'
    b'</Command>': _NoPopList((
        b'<MeterInfo>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <MeterMacId>0xFEDCBA9876543210</MeterMacId>'
        b'    <MeterType>electric</MeterType>'
        b'    <NickName>House</NickName>'
        b'    <Account>8675309</Account>'
        b'    <Auth>p@ssw0rd</Auth>'
        b'    <Host>Example, Inc.</Host>'
        b'    <Enabled>Y</Enabled>'
        b'</MeterInfo>',
    )),
    b'<Command><Name>get_meter_list</Name></Command>': _NoPopList((
        b'<MeterList>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <MeterMacId>0xFEDCBA9876543210</MeterMacId>'
        b'</MeterList>',
    )),
    b'<Command><Name>get_network_info</Name></Command>': _NoPopList((
        b'<NetworkInfo>'
        b'    <DeviceMacId>0x0123456789ABCDEF</DeviceMacId>'
        b'    <CoordMacId>0xFEDCBA9876543210</CoordMacId>'
        b'    <Status>Connected</Status>'
        b'    <Description>Network is operational</Description>'
        b'    <StatusCode>0x42</StatusCode>'
        b'    <ExtPanId>0x9876543210ABCDEF</ExtPanId>'
        b'    <Channel>24</Channel>'
        b'    <ShortAddr>0x5678</ShortAddr>'
        b'    <LinkStrength>0x24</LinkStrength>'
        b'</NetworkInfo>',
    )),
}


async def _device_loop(
    reader: asyncio.StreamReader,
    writer: asyncio.StreamWriter,
    responses: _ResponseMapping
) -> None:
    buffer = b''
    while True:
        try:
            try:
                value = await reader.read(1)
            except asyncio.CancelledError:
                break
            if not value:
                break
            buffer += value
            buffer = buffer.lstrip()
            for k, v in responses.items():
                if buffer.startswith(k):
                    if isinstance(v, list):
                        first = v.pop(0)
                        if first is not None:
                            writer.write(first)
                        if not v:
                            del responses[k]
                    else:
                        if v is not None:
                            writer.write(v)
                        del responses[k]
                    buffer = buffer[len(k):]
                    break
        except asyncio.CancelledError:
            if not writer.can_write_eof():
                break
            writer.write_eof()
            await writer.drain()
    writer.close()


@asynccontextmanager
async def mock_pty_device(
    responses: Optional[_ResponseMapping] = None,
    initial_buffer: Optional[bytes] = None
) -> AsyncIterator[str]:
    if responses is None:
        responses = DEFAULT_RESPONSES

    import pty

    server, client = pty.openpty()

    server_in = os.fdopen(server, 'rb', 0, closefd=False)
    server_out = os.fdopen(server, 'wb', 0, closefd=False)

    reader, writer, read_transport = await connect_pipes(server_in, server_out)

    if initial_buffer is not None:
        writer.write(initial_buffer)
    task = asyncio.create_task(_device_loop(reader, writer, responses))

    yield os.ttyname(client)

    task.cancel()

    try:
        await task
    except asyncio.CancelledError:
        pass

    read_transport.close()
    writer.close()

    server_in.close()
    server_out.close()
    os.close(server)
    os.close(client)


@asynccontextmanager
async def mock_device(
    responses: Optional[_ResponseMapping] = None,
    initial_buffer: Optional[bytes] = None
) -> AsyncIterator[None]:
    """
    Create a mock device at a TCP endpoint.

    This function creates a context-managed TCP endpoint which echoes verbatim
    responses given verbatim requests.

    :param dict responses: A mapping of request strings to responses.
    :param bytes initial_buffer: Content to initialize the response buffer.

    :returns: A tuple including the host and port of the TCP endpoint.
    """
    if responses is None:
        responses = DEFAULT_RESPONSES

    connections = []

    def client_connected(
        reader: asyncio.StreamReader,
        writer: asyncio.StreamWriter
    ) -> Awaitable[None]:
        if initial_buffer is not None:
            writer.write(initial_buffer)
        task = asyncio.create_task(_device_loop(reader, writer, responses))
        connections.append(task)
        return asyncio.wait_for(task, None)

    server = await asyncio.start_server(client_connected, host='127.0.0.1')
    try:
        yield server.sockets[0].getsockname()
    finally:
        server.close()
    if not connections:
        return

    _, pending = await asyncio.wait(connections, timeout=0.1)
    for task in pending:
        task.cancel()
    if pending:
        await asyncio.wait(pending)


async def connect_pipes(
    in_pipe: BinaryIO,
    out_pipe: BinaryIO,
    loop: Optional[asyncio.AbstractEventLoop] = None,
) -> tuple[asyncio.StreamReader, asyncio.StreamWriter, asyncio.ReadTransport]:
    if loop is None:
        loop = asyncio.get_event_loop()
    reader = asyncio.StreamReader()
    protocol = asyncio.StreamReaderProtocol(reader)

    read_transport, _ = await loop.connect_read_pipe(
        lambda: protocol, in_pipe)
    write_transport, write_protocol = await loop.connect_write_pipe(
        asyncio.streams.FlowControlMixin, out_pipe)
    writer = asyncio.StreamWriter(
        write_transport, write_protocol, reader, loop)
    return reader, writer, read_transport


async def main(argv: list[str] = sys.argv) -> Optional[int]:
    if len(argv) == 1:
        reader, writer, read_transport = await connect_pipes(
            sys.stdin.buffer, sys.stdout.buffer)
    elif len(argv) == 2:
        read_transport = None
        reader, writer = await serial_asyncio_fast.open_serial_connection(
            url=argv[1])
    else:
        print(f'Usage: {argv[0]} [DEVICE_PATH]', file=sys.stderr)
        return 1
    await _device_loop(reader, writer, DEFAULT_RESPONSES)
    if read_transport is not None:
        read_transport.close()
    return 0


if __name__ == '__main__':
    sys.exit(asyncio.run(main()))