147 lines
4.1 KiB
Python
147 lines
4.1 KiB
Python
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#
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# Copyright BitBake Contributors
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#
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# SPDX-License-Identifier: GPL-2.0-only
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#
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import asyncio
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import itertools
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import json
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from datetime import datetime
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from .exceptions import ClientError, ConnectionClosedError
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# The Python async server defaults to a 64K receive buffer, so we hardcode our
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# maximum chunk size. It would be better if the client and server reported to
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# each other what the maximum chunk sizes were, but that will slow down the
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# connection setup with a round trip delay so I'd rather not do that unless it
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# is necessary
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DEFAULT_MAX_CHUNK = 32 * 1024
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def chunkify(msg, max_chunk):
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if len(msg) < max_chunk - 1:
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yield "".join((msg, "\n"))
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else:
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yield "".join((json.dumps({"chunk-stream": None}), "\n"))
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args = [iter(msg)] * (max_chunk - 1)
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for m in map("".join, itertools.zip_longest(*args, fillvalue="")):
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yield "".join(itertools.chain(m, "\n"))
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yield "\n"
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def json_serialize(obj):
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if isinstance(obj, datetime):
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return obj.isoformat()
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raise TypeError("Type %s not serializeable" % type(obj))
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class StreamConnection(object):
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def __init__(self, reader, writer, timeout, max_chunk=DEFAULT_MAX_CHUNK):
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self.reader = reader
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self.writer = writer
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self.timeout = timeout
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self.max_chunk = max_chunk
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@property
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def address(self):
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return self.writer.get_extra_info("peername")
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async def send_message(self, msg):
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for c in chunkify(json.dumps(msg, default=json_serialize), self.max_chunk):
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self.writer.write(c.encode("utf-8"))
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await self.writer.drain()
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async def recv_message(self):
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l = await self.recv()
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m = json.loads(l)
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if not m:
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return m
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if "chunk-stream" in m:
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lines = []
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while True:
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l = await self.recv()
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if not l:
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break
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lines.append(l)
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m = json.loads("".join(lines))
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return m
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async def send(self, msg):
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self.writer.write(("%s\n" % msg).encode("utf-8"))
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await self.writer.drain()
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async def recv(self):
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if self.timeout < 0:
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line = await self.reader.readline()
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else:
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try:
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line = await asyncio.wait_for(self.reader.readline(), self.timeout)
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except asyncio.TimeoutError:
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raise ConnectionError("Timed out waiting for data")
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if not line:
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raise ConnectionClosedError("Connection closed")
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line = line.decode("utf-8")
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if not line.endswith("\n"):
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raise ConnectionError("Bad message %r" % (line))
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return line.rstrip()
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async def close(self):
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self.reader = None
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if self.writer is not None:
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self.writer.close()
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self.writer = None
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class WebsocketConnection(object):
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def __init__(self, socket, timeout):
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self.socket = socket
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self.timeout = timeout
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@property
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def address(self):
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return ":".join(str(s) for s in self.socket.remote_address)
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async def send_message(self, msg):
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await self.send(json.dumps(msg, default=json_serialize))
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async def recv_message(self):
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m = await self.recv()
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return json.loads(m)
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async def send(self, msg):
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import websockets.exceptions
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try:
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await self.socket.send(msg)
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except websockets.exceptions.ConnectionClosed:
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raise ConnectionClosedError("Connection closed")
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async def recv(self):
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import websockets.exceptions
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try:
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if self.timeout < 0:
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return await self.socket.recv()
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try:
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return await asyncio.wait_for(self.socket.recv(), self.timeout)
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except asyncio.TimeoutError:
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raise ConnectionError("Timed out waiting for data")
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except websockets.exceptions.ConnectionClosed:
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raise ConnectionClosedError("Connection closed")
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async def close(self):
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if self.socket is not None:
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await self.socket.close()
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self.socket = None
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