200 lines
10 KiB
Python
200 lines
10 KiB
Python
from fastapi import WebSocket, APIRouter, WebSocketDisconnect, FastAPI
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from typing import Dict, Any, Optional
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import datetime
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import asyncio
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import json
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from contextlib import asynccontextmanager
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# 创建WebSocket路由
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ws_router = APIRouter()
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# 客户端连接信息数据结构
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class ClientConnection:
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def __init__(self, websocket: WebSocket, client_ip: str):
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self.websocket = websocket
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self.client_ip = client_ip
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self.last_heartbeat = datetime.datetime.now() # 初始心跳时间为连接时间
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def update_heartbeat(self):
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"""更新心跳时间为当前时间"""
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self.last_heartbeat = datetime.datetime.now()
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# 打印心跳更新日志
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 客户端 {self.client_ip} 心跳时间已更新")
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def is_alive(self, timeout_seconds: int = 60) -> bool:
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"""检查客户端是否活跃（心跳超时阈值：60秒）"""
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timeout = (datetime.datetime.now() - self.last_heartbeat).total_seconds()
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# 打印心跳检查明细（便于排查超时原因）
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 客户端 {self.client_ip} 心跳检查："
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f"上次心跳距今 {timeout:.1f} 秒（阈值：{timeout_seconds}秒）")
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return timeout < timeout_seconds
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# 存储所有已连接的客户端（key：客户端IP、value：ClientConnection对象）
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connected_clients: Dict[str, ClientConnection] = {}
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# 心跳检查任务引用（全局变量、用于应用关闭时取消任务）
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heartbeat_task: Optional[asyncio.Task] = None
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async def heartbeat_checker():
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"""定期检查客户端心跳（每30秒一次）、超时直接剔除（不发通知）"""
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while True:
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current_time = datetime.datetime.now()
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print(f"\n[{current_time:%Y-%m-%d %H:%M:%S}] === 开始新一轮心跳检查 ===")
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print(f"[{current_time:%Y-%m-%d %H:%M:%S}] 当前在线客户端总数：{len(connected_clients)}")
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# 1. 收集超时客户端IP（避免遍历中修改字典）
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timeout_clients = []
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for client_ip, connection in connected_clients.items():
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if not connection.is_alive():
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timeout_clients.append(client_ip)
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# 2. 处理超时客户端（关闭连接+移除记录）
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if timeout_clients:
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print(f"[{current_time:%Y-%m-%d %H:%M:%S}] 发现超时客户端：{timeout_clients}（共{len(timeout_clients)}个）")
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for client_ip in timeout_clients:
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try:
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connection = connected_clients[client_ip]
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# 直接关闭连接（不发送任何通知）
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await connection.websocket.close(code=1008, reason="心跳超时（>60秒）")
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print(f"[{current_time:%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 已关闭（超时）")
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except Exception as e:
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print(
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f"[{current_time:%Y-%m-%d %H:%M:%S}] 关闭客户端 {client_ip} 失败：{str(e)}（错误类型：{type(e).__name__}）")
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finally:
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# 确保从客户端列表中移除（无论关闭是否成功）
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if client_ip in connected_clients:
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del connected_clients[client_ip]
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print(f"[{current_time:%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 已从连接列表移除")
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else:
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print(f"[{current_time:%Y-%m-%d %H:%M:%S}] 无超时客户端、心跳检查完成")
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# 3. 等待30秒后进行下一轮检查
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await asyncio.sleep(30)
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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"""应用生命周期管理：启动时创建心跳任务、关闭时取消任务"""
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global heartbeat_task
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# 启动阶段：创建心跳检查任务
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heartbeat_task = asyncio.create_task(heartbeat_checker())
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 心跳检查任务已启动（任务ID：{id(heartbeat_task)}）")
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yield # 应用运行中
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# 关闭阶段：取消心跳任务
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if heartbeat_task and not heartbeat_task.done():
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heartbeat_task.cancel()
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try:
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await heartbeat_task # 等待任务优雅退出
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except asyncio.CancelledError:
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 心跳检查任务已正常取消")
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except Exception as e:
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 取消心跳任务时出错：{str(e)}")
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async def send_heartbeat_ack(client_ip: str, client_timestamp: Any) -> bool:
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"""向客户端回复心跳确认（严格遵循 {"timestamp":xxxxx, "type":"heartbeat"} 格式）"""
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if client_ip not in connected_clients:
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 回复心跳失败：客户端 {client_ip} 不在连接列表中")
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return False
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# 修复：将这部分代码移出if语句块、确保始终定义ack_msg
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# 服务端当前格式化时间戳（字符串类型、与日志时间格式匹配）
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server_latest_timestamp = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
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ack_msg = {
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"timestamp": server_latest_timestamp,
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"type": "heartbeat"
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}
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try:
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connection = connected_clients[client_ip]
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await connection.websocket.send_json(ack_msg)
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print(
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f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 已向客户端 {client_ip} 回复心跳：{json.dumps(ack_msg, ensure_ascii=False)}")
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return True
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except Exception as e:
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print(
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f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 回复客户端 {client_ip} 心跳失败：{str(e)}（错误类型：{type(e).__name__}）")
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# 发送失败时移除客户端（避免无效连接残留）
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if client_ip in connected_clients:
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del connected_clients[client_ip]
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print(f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 因心跳回复失败被移除")
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return False
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@ws_router.websocket("/ws")
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async def websocket_endpoint(websocket: WebSocket):
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"""WebSocket核心端点：处理连接建立/消息接收/连接关闭"""
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current_time = datetime.datetime.now()
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# 1. 接受客户端连接请求
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await websocket.accept()
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# 获取客户端IP（作为唯一标识）
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client_ip = websocket.client.host if websocket.client else "unknown_ip"
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print(f"\n[{current_time:%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 连接请求已接受（WebSocket握手成功）")
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try:
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# 2. 处理"同一IP重复连接"场景：关闭旧连接、保留新连接
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if client_ip in connected_clients:
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old_connection = connected_clients[client_ip]
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await old_connection.websocket.close(code=1008, reason="同一IP新连接已建立")
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del connected_clients[client_ip]
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print(f"[{current_time:%Y-%m-%d %H:%M:%S}] 已关闭客户端 {client_ip} 的旧连接（新连接已建立）")
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# 3. 注册新客户端到连接列表
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new_connection = ClientConnection(websocket, client_ip)
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connected_clients[client_ip] = new_connection
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print(
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f"[{current_time:%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 已注册到连接列表、当前在线数：{len(connected_clients)}")
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# 4. 循环接收客户端消息（持续监听）
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while True:
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# 接收原始文本消息（避免提前解析JSON、便于日志打印）
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raw_data = await websocket.receive_text()
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recv_time = datetime.datetime.now()
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print(f"\n[{recv_time:%Y-%m-%d %H:%M:%S}] 收到客户端 {client_ip} 的消息：{raw_data}")
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# 尝试解析JSON消息
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try:
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message = json.loads(raw_data)
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print(
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f"[{recv_time:%Y-%m-%d %H:%M:%S}] 消息解析成功：{json.dumps(message, ensure_ascii=False, indent=2)}")
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# 5. 区分消息类型：仅处理心跳、其他消息不回复
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if message.get("type") == "heartbeat":
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# 验证心跳消息是否包含timestamp字段
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client_timestamp = message.get("timestamp")
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if client_timestamp is None:
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print(f"[{recv_time:%Y-%m-%d %H:%M:%S}] 警告：客户端 {client_ip} 发送的心跳缺少'timestamp'字段")
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continue # 不回复无效心跳
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# 更新心跳时间 + 回复心跳确认
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new_connection.update_heartbeat()
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await send_heartbeat_ack(client_ip, client_timestamp)
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else:
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# 非心跳消息：仅打印日志、不回复任何内容
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print(f"[{recv_time:%Y-%m-%d %H:%M:%S}] 非心跳消息（类型：{message.get('type')}）、不回复")
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except json.JSONDecodeError as e:
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# JSON格式错误：仅打印日志、不回复
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print(f"[{recv_time:%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 消息格式错误：无效JSON（错误：{str(e)}）")
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except Exception as e:
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# 其他未知错误：仅打印日志、不回复
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print(
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f"[{recv_time:%Y-%m-%d %H:%M:%S}] 处理客户端 {client_ip} 消息时出错：{str(e)}（错误类型：{type(e).__name__}）")
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except WebSocketDisconnect as e:
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# 客户端主动断开连接（如关闭页面、网络中断）
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print(
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f"\n[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 主动断开连接（代码：{e.code}、原因：{e.reason}）")
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except Exception as e:
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# 其他连接级错误（如网络异常）
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print(
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f"\n[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 连接异常：{str(e)}（错误类型：{type(e).__name__}）")
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finally:
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# 无论何种退出原因、确保客户端从列表中移除
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if client_ip in connected_clients:
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del connected_clients[client_ip]
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print(
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f"[{datetime.datetime.now():%Y-%m-%d %H:%M:%S}] 客户端 {client_ip} 已从连接列表移除、当前在线数：{len(connected_clients)}") |