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274 lines
9.8 KiB
Python
274 lines
9.8 KiB
Python
import asyncio
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from loguru import logger
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GREETINGS = 0xEB
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PROTOCOL_VERSION = 1
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OP_NOP = 0
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OP_PUBLISH = 1
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OP_SUBSCRIBE = 2
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OP_UNSUBSCRIBE = 3
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OP_MESSAGE = 0x12
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OP_BROADCAST = 0x13
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OP_ACK = 0xFE
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RESPONSE_OK = 0x01
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ERR_CLIENT_NOT_REGISTERED = 0x71
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ERR_DATA = 0x72
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ERR_IO = 0x73
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ERR_OTHER = 0x74
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ERR_NOT_SUPPORTED = 0x75
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ERR_BUSY = 0x76
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ERR_NOT_DELIVERED = 0x77
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ERR_TIMEOUT = 0x78
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PING_FRAME = b'\x00' * 9
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async def on_frame_default(frame):
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pass
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class Client:
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def __init__(self, path, name):
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self.path = path
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self.writer = None
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self.reader_fut = None
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self.pinger_fut = None
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self.buf_size = 8192
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self.name = name
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self.frame_id = 0
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self.ping_interval = 1
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self.on_frame = on_frame_default
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self.socket_lock = asyncio.Lock()
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self.mgmt_lock = asyncio.Lock()
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self.connected = False
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self.frames = {}
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self.timeout = 1
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async def connect(self):
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async with self.mgmt_lock:
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if self.path.endswith('.sock') or self.path.endswith(
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'.socket') or self.path.endswith(
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'.ipc') or self.path.startswith('/'):
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if hasattr(asyncio, 'open_unix_connection'):
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reader, writer = await asyncio.open_unix_connection(
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self.path, limit=self.buf_size)
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else:
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raise ValueError('only support unix like system')
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else:
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host, port = self.path.rsplit(':', maxsplit=2)
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reader, writer = await asyncio.open_connection(
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host, int(port), limit=self.buf_size)
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buf = await asyncio.wait_for(self.readexactly(reader, 3),
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timeout=self.timeout)
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if buf[0] != GREETINGS:
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raise RuntimeError('Unsupported protocol')
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if int.from_bytes(buf[1:3], 'little') != PROTOCOL_VERSION:
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raise RuntimeError('Unsupported protocol version')
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writer.write(buf)
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await asyncio.wait_for(writer.drain(), timeout=self.timeout)
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buf = await asyncio.wait_for(self.readexactly(reader, 1),
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timeout=self.timeout)
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if buf[0] != RESPONSE_OK:
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raise RuntimeError(f'Server response: {hex(buf[0])}')
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name = self.name.encode()
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writer.write(len(name).to_bytes(2, 'little') + name)
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await asyncio.wait_for(writer.drain(), timeout=self.timeout)
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buf = await asyncio.wait_for(self.readexactly(reader, 1),
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timeout=self.timeout)
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if buf[0] != RESPONSE_OK:
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raise RuntimeError(f'Server response: {hex(buf[0])}')
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self.writer = writer
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self.connected = True
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self.pinger_fut = asyncio.ensure_future(self._t_pinger())
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self.reader_fut = asyncio.ensure_future(self._t_reader(reader))
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async def handle_daemon_exception(self, e):
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async with self.mgmt_lock:
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if self.connected:
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await self._disconnect()
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import traceback
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logger.error(traceback.format_exc())
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async def _t_pinger(self):
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try:
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while True:
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await asyncio.sleep(self.ping_interval)
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async with self.socket_lock:
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self.writer.write(PING_FRAME)
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await asyncio.wait_for(self.writer.drain(),
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timeout=self.timeout)
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except Exception as e:
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asyncio.ensure_future(self.handle_daemon_exception(e))
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async def _t_reader(self, reader):
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try:
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while True:
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buf = await self.readexactly(reader, 6)
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if buf[0] == OP_NOP:
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continue
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elif buf[0] == OP_ACK:
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op_id = int.from_bytes(buf[1:5], 'little')
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try:
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o = self.frames.pop(op_id)
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o.result = buf[5]
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o.completed.set()
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except KeyError:
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logger.warning(f'orphaned BUS/RT frame ack {op_id}')
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else:
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async def read_frame(tp, data_len):
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frame = Frame()
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frame.type = tp
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sender = await reader.readuntil(b'\x00')
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data_len -= len(sender)
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frame.sender = sender[:-1].decode()
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if buf[0] == OP_PUBLISH:
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topic = await reader.readuntil(b'\x00')
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data_len -= len(topic)
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frame.topic = topic[:-1].decode()
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else:
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frame.topic = None
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data = b''
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while len(data) < data_len:
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buf_size = data_len - len(data)
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len(data)
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try:
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data += await reader.readexactly(
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buf_size if buf_size < self.buf_size else
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self.buf_size)
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except asyncio.IncompleteReadError:
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pass
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frame.payload = data
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return frame
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try:
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data_len = int.from_bytes(buf[1:5], 'little')
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frame = await read_frame(buf[0], data_len)
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except Exception as e:
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logger.error(f'Invalid frame from the server: {e}')
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raise
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asyncio.ensure_future(self.on_frame(frame))
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except Exception as e:
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asyncio.ensure_future(self.handle_daemon_exception(e))
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async def readexactly(self, reader, data_len):
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data = b''
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while len(data) < data_len:
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buf_size = data_len - len(data)
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try:
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chunk = await reader.readexactly(
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buf_size if buf_size < self.buf_size else self.buf_size)
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data += chunk
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except asyncio.IncompleteReadError:
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await asyncio.sleep(0.01)
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return data
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async def disconnect(self):
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async with self.mgmt_lock:
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await self._disconnect()
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async def _disconnect(self):
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self.connected = False
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self.writer.close()
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if self.reader_fut is not None:
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self.reader_fut.cancel()
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if self.pinger_fut is not None:
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self.pinger_fut.cancel()
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async def send(self, target=None, frame=None):
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try:
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async with self.socket_lock:
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self.frame_id += 1
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if self.frame_id > 0xffff_ffff:
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self.frame_id = 1
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frame_id = self.frame_id
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o = ClientFrame(frame.qos)
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if frame.qos & 0b1 != 0:
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self.frames[frame_id] = o
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flags = frame.type | frame.qos << 6
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if frame.type == OP_SUBSCRIBE or frame.type == OP_UNSUBSCRIBE:
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topics = frame.topic if isinstance(frame.topic,
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list) else [frame.topic]
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payload = b'\x00'.join(t.encode() for t in topics)
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self.writer.write(
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frame_id.to_bytes(4, 'little') +
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flags.to_bytes(1, 'little') +
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len(payload).to_bytes(4, 'little') + payload)
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else:
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frame_len = len(target) + len(frame.payload) + 1
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if frame.header is not None:
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frame_len += len(frame.header)
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if frame_len > 0xffff_ffff:
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raise ValueError('frame too large')
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self.writer.write(
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frame_id.to_bytes(4, 'little') +
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flags.to_bytes(1, 'little') +
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frame_len.to_bytes(4, 'little') + target.encode() +
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b'\x00' +
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(frame.header if frame.header is not None else b''))
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self.writer.write(frame.payload.encode(
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) if isinstance(frame.payload, str) else frame.payload)
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await self.writer.drain()
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return o
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except:
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try:
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del self.frames[frame_id]
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except KeyError:
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pass
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raise
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def subscribe(self, topics):
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frame = Frame(tp=OP_SUBSCRIBE)
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frame.topic = topics
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return self.send(None, frame)
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def unsubscribe(self, topics):
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frame = Frame(tp=OP_UNSUBSCRIBE)
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frame.topic = topics
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return self.send(None, frame)
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def is_connected(self):
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return self.connected
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class ClientFrame:
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def __init__(self, qos):
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self.qos = qos
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self.result = 0
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if qos & 0b1 != 0:
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self.completed = asyncio.Event()
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else:
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self.completed = None
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def is_completed(self):
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if self.qos & 0b1 != 0:
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return self.completed.is_set()
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else:
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return True
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async def wait_completed(self, timeout=None):
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if self.qos & 0b1 == 0:
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return RESPONSE_OK
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elif timeout:
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await asyncio.wait_for(self.completed.wait(), timeout=timeout)
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else:
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await self.completed.wait()
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return self.result
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class Frame:
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def __init__(self, payload=None, tp=OP_MESSAGE, qos=0):
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self.payload = payload
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# used for zero-copy
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self.header = None
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self.type = tp
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self.qos = qos
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__all__ = ["Client","Frame","OP_PUBLISH","OP_MESSAGE","OP_BROADCAST","ERR_IO","ERR_TIMEOUT","RESPONSE_OK","on_frame_default"] |