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217 lines
8.7 KiB
Python
217 lines
8.7 KiB
Python
# -*- coding: utf-8 -*-
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"""修：被顶替的会话抢走了本该给新会话的数据。
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证据（Java 客户端打点）：
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[dbg] attach ok session=ad9283e7 <- 新手表接入
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[dbg] send 122 bytes -> 200 <- 新手表发 auth
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[dbg] poll -> 200 bytes=53 session=ad9283e7 <- 新手表其实收到了
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[dbg] poll -> 200 bytes=50 session=a7c11203 <- 但旧手表也收到了一份
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根因：
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device.to_client 是**按设备共享**的一个缓冲区。
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旧会话被顶掉后，它那个 40 秒的长轮询还挂在 device.event 上。
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新数据一来，谁先醒谁拿走 —— 旧会话就把它截胡了。
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修法：
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1. Session 各自带一个 event
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2. 顶替旧会话时，把它的 event set() 一下 —— 它的长轮询立刻醒来
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3. client_take 每轮先看 session.replaced，是就抛 _Replaced
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4. 接口层把 _Replaced 翻成 409 + replaced，客户端据此断开（不抢）
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5. 数据只唤醒**当前**会话（device.active_session）
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"""
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from __future__ import annotations
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import sys
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from pathlib import Path
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RELAY = Path(r"C:\Users\shu\Desktop\deepseekagent\LanRemote\relay\relay.py")
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# ---------------- 1. Device 记住当前会话对象 ----------------
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OLD_SLOTS = ''' "event", "bytes_in", "bytes_out", "current_session")'''
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NEW_SLOTS = ''' "event", "bytes_in", "bytes_out", "current_session",
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"active_session")'''
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OLD_INIT = ''' self.current_session = ""'''
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NEW_INIT = ''' self.current_session = ""
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# 当前挂在这台设备上的 Session 对象。数据来了只唤醒它，
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# 不要让已经被顶掉的旧会话把数据截胡。
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self.active_session = None'''
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# ---------------- 2. push_to_client 只唤醒当前会话 ----------------
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OLD_PUSH = ''' def push_to_client(self, data: bytes) -> None:
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if not data:
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return
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self.bytes_out += len(data)
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self._append(self.to_client, data)
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self.event.set()'''
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NEW_PUSH = ''' def push_to_client(self, data: bytes) -> None:
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if not data:
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return
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self.bytes_out += len(data)
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self._append(self.to_client, data)
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self.event.set()
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# 同时叫醒当前那个会话的长轮询（旧会话已经被替换，不该再拿数据）
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session = self.active_session
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if session is not None:
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session.event.set()'''
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# ---------------- 3. Session 带自己的 event + replaced ----------------
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OLD_SESSION = ''' __slots__ = ("token", "device_id", "code", "name", "ip",
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"created", "last_seen")
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def __init__(self, device_id: str, code: str, name: str, ip: str) -> None:
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self.token = secrets.token_hex(24)
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self.device_id = device_id
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self.code = code
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self.name = name
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self.ip = ip
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self.created = time.time()
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self.last_seen = time.time()'''
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NEW_SESSION = ''' __slots__ = ("token", "device_id", "code", "name", "ip",
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"created", "last_seen", "event", "replaced")
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def __init__(self, device_id: str, code: str, name: str, ip: str) -> None:
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self.token = secrets.token_hex(24)
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self.device_id = device_id
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self.code = code
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self.name = name
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self.ip = ip
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self.created = time.time()
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self.last_seen = time.time()
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# 自己的唤醒事件。每个会话独立等待，避免被顶掉的旧会话截胡数据。
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self.event = threading.Event()
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self.replaced = False'''
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# ---------------- 4. attach：踢的时候唤醒旧会话 ----------------
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OLD_KICK = ''' if stale.device_id == device_id:
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self.sessions.pop(stale_token, None)
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self.retired[stale_token] = "replaced"
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log(f"踢掉旧会话 {stale_token[:8]}…（同一设备只允许一个）")'''
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NEW_KICK = ''' if stale.device_id == device_id:
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self.sessions.pop(stale_token, None)
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self.retired[stale_token] = "replaced"
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stale.replaced = True
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# 立刻叫醒它挂着的长轮询 —— 否则它会一直等下去，
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# 等新数据来时把本该给新手表的数据抢走。
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stale.event.set()
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log(f"踢掉旧会话 {stale_token[:8]}…（同一设备只允许一个）")'''
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OLD_BIND = ''' device.current_session = session.token
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# 换会话了：把上一条留在队列里的半截数据清掉，
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# 不然新手表会收到上一个手表没取走的残留字节。
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device.to_client.clear()'''
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NEW_BIND = ''' device.current_session = session.token
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device.active_session = session
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# 换会话了：把上一条留在队列里的半截数据清掉，
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# 不然新手表会收到上一个手表没取走的残留字节。
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device.to_client.clear()'''
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# ---------------- 5. client_take：独立事件 + 让位 ----------------
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OLD_TAKE = ''' def client_take(self, session: Session, wait: float) -> bytes:
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"""手表取走「被控端发来的」数据。"""
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with self.lock:
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device = self.devices.get(session.device_id)
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if device is None:
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return b""
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return self._take(device, device.to_client, wait, "client")'''
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NEW_TAKE = ''' def client_take(self, session: Session, wait: float) -> bytes:
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"""手表取走「被控端发来的」数据。
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注意这里**不能**复用 _take：那个是按设备的事件等的，
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会把被顶掉的旧会话和新会话混在一起等，导致数据被旧会话截胡。
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每个会话等自己的 event，并且每轮先看自己是不是已经被顶替了。
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"""
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deadline = time.time() + wait
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while True:
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if session.replaced:
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raise SessionReplaced()
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with self.lock:
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device = self.devices.get(session.device_id)
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if device is None:
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return b""
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if device.to_client:
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data = bytes(device.to_client)
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device.to_client.clear()
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device.event.clear()
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session.event.clear()
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return data
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remaining = deadline - time.time()
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if remaining <= 0:
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return b""
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session.event.wait(min(remaining, 0.5))
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session.event.clear()'''
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# ---------------- 6. _Replaced 异常 ----------------
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OLD_EXC_ANCHOR = '''class Relay:'''
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NEW_EXC = '''class SessionReplaced(Exception):
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"""这个会话已经被新的手表顶替了 —— 它必须让位，不能继续取数据。"""
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class Relay:'''
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# ---------------- 7. 接口层翻成 409 ----------------
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OLD_POLL = ''' data = RELAY.client_take(session, POLL_SECONDS)
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self._send(200, data, "application/octet-stream")
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return'''
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NEW_POLL = ''' try:
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data = RELAY.client_take(session, POLL_SECONDS)
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except SessionReplaced:
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self._json(409, {"ok": False, "replaced": True,
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"error": "已被另一台手表接管"})
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return
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self._send(200, data, "application/octet-stream")
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return'''
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# ---------------- 8. push_to_agent 也唤醒对应会话（agent 侧不用改） ----------------
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def main() -> int:
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text = RELAY.read_text(encoding="utf-8")
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ok = True
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for old, new, tag in ((OLD_SLOTS, NEW_SLOTS, "Device 加 active_session"),
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(OLD_INIT, NEW_INIT, "初始化 active_session"),
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(OLD_PUSH, NEW_PUSH, "push 只唤醒当前会话"),
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(OLD_SESSION, NEW_SESSION, "Session 带 event/replaced"),
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(OLD_KICK, NEW_KICK, "踢的时候唤醒旧会话"),
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(OLD_BIND, NEW_BIND, "绑定 active_session"),
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(OLD_TAKE, NEW_TAKE, "client_take 独立等待 + 让位"),
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(OLD_EXC_ANCHOR, NEW_EXC, "SessionReplaced 异常"),
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(OLD_POLL, NEW_POLL, "poll 把让位翻成 409")):
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if old not in text:
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print(f" [失败] {tag} —— 锚点没找到")
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ok = False
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continue
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text = text.replace(old, new, 1)
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print(f" {tag}")
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RELAY.write_text(text, encoding="utf-8")
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import ast
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try:
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ast.parse(text)
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print(" 语法 OK")
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except SyntaxError as exc:
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print(f" 语法错误: {exc}")
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ok = False
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return 0 if ok else 1
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if __name__ == "__main__":
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sys.exit(main())
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