jensandClaude Sonnet 4.6
3f6f403b7b
getpeername() raised ENOTCONN when a connect failed or the peer closed the socket, crashing the event loop thread. Identify sockets via the selector key's data (set at register time) instead, and catch OSError on recv/send to cleanly close and unregister a dead socket rather than crashing. Also fix select(timeout=100) which waited 100 seconds instead of 100ms, causing stop() to hang after a dead socket was unregistered. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
96 lines
2.7 KiB
Python
96 lines
2.7 KiB
Python
import socket
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import selectors
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from threading import Thread
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from queue import Queue
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from msg.container import MsgContainer
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from transceiver import Transceiver, ATransceiver
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from backend.a_backend import ABackend
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class NetworkBackend(ABackend):
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def __init__(self, servers: list[dict]):
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self.sel = None
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self.sock_list = [{'name': s['name'], 'addr': (socket.gethostbyname(s['host']), s['port']), 'xcvr': None, 'queue': Queue()} for s in servers]
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self.thread = Thread(target=self.event_loop)
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self.loop_enable = True
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def send(self, xcvr: ATransceiver, data: bytes):
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sock = self.find_by_name(xcvr.name)
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sock['queue'].put(data)
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if sock is not None:
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self.sel.modify(sock['sock'], selectors.EVENT_READ + selectors.EVENT_WRITE, sock)
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def start(self):
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self.thread.start()
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def stop(self):
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if self.loop_enable:
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self.loop_enable = False
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self.thread.join()
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def register_xcvr(self, xcvr: Transceiver):
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found = False
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for sock in self.sock_list:
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if xcvr.name in sock['name']:
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found = True
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sock['xcvr'] = xcvr
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xcvr.on_register(self)
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break
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if not found:
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raise Exception(f"No socket found for \"{xcvr.name}\"")
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def find_by_name(self, name: str):
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for sock in self.sock_list:
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if sock['name'] == name:
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return sock
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return None
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def _prepare(self):
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for server in self.sock_list:
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.setblocking(False)
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server['sock'] = sock
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def connect(self):
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self._prepare()
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self.sel = selectors.DefaultSelector()
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events = selectors.EVENT_READ
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for sock in self.sock_list:
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print(f"Starting connection {sock['name']} to {sock['addr']}")
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self.sel.register(sock['sock'], events, data=sock)
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sock['sock'].connect_ex(sock['addr'])
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def disconnect(self):
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for sock in self.sock_list:
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sock['sock'].close()
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def event_loop(self):
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try:
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while self.loop_enable:
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events = self.sel.select(timeout=0.1)
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for key, mask in events:
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sock = key.data
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try:
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if mask & selectors.EVENT_READ:
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data = key.fileobj.recv(64)
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if not data:
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raise OSError("connection closed by peer")
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sock['xcvr'].on_recv(MsgContainer(data, sock['xcvr']))
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if mask & selectors.EVENT_WRITE:
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data = sock['queue'].get()
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key.fileobj.send(data)
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print(f"Send: {sock['name']}: {data}")
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if sock['queue'].empty():
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self.sel.modify(sock['sock'], selectors.EVENT_READ, sock)
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except OSError as exc:
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print(f"Connection {sock['name']} to {sock['addr']} lost: {exc}")
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self.sel.unregister(key.fileobj)
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key.fileobj.close()
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except KeyboardInterrupt:
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print("Caught keyboard interrupt, exiting")
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finally:
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self.sel.close() |