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import { onBeforeUnmount, reactive, ref } from 'vue';
import { baseUrl, websocketPath } from '@/sheep/config';
import { copyValueToTarget } from '@/sheep/util';
/**
* WebSocket 创建 hook
* @param opt 连接配置
* @return {{options: *}}
*/
export function useWebSocket(opt) {
const getAccessToken = () => {
return uni.getStorageSync('token');
};
const options = reactive({
url: (baseUrl + websocketPath).replace('http', 'ws') + '?token=' + getAccessToken(), // ws 地址
isReconnecting: false, // 正在重新连接
reconnectInterval: 3000, // 重连间隔,单位毫秒
heartBeatInterval: 5000, // 心跳间隔,单位毫秒
pingTimeoutDuration: 1000, // 超过这个时间后端没有返回pong则判定后端断线了。
heartBeatTimer: null, // 心跳计时器
destroy: false, // 是否销毁
pingTimeout: null, // 心跳检测定时器
reconnectTimeout: null, // 重连定时器ID的属性
onConnected: () => {
}, // 连接成功时触发
onClosed: () => {
}, // 连接关闭时触发
onMessage: (data) => {
}, // 收到消息
});
const SocketTask = ref(null); // SocketTask 由 uni.connectSocket() 接口创建
const initEventListeners = () => {
// 监听 WebSocket 连接打开事件
SocketTask.value.onOpen(() => {
console.log('WebSocket 连接成功');
// 连接成功时触发
options.onConnected();
// 开启心跳检查
startHeartBeat();
});
// 监听 WebSocket 接受到服务器的消息事件
SocketTask.value.onMessage((res) => {
try {
if (res.data === 'pong') {
// 收到心跳重置心跳超时检查
resetPingTimeout();
} else {
options.onMessage(JSON.parse(res.data));
}
} catch (error) {
console.error(error);
}
});
// 监听 WebSocket 连接关闭事件
SocketTask.value.onClose((event) => {
// 情况一:实例销毁
if (options.destroy) {
options.onClosed();
} else { // 情况二:连接失败重连
// 停止心跳检查
stopHeartBeat();
// 重连
reconnect();
}
});
};
// 发送消息
const sendMessage = (message) => {
if (SocketTask.value && !options.destroy) {
SocketTask.value.send({ data: message });
}
};
// 开始心跳检查
const startHeartBeat = () => {
options.heartBeatTimer = setInterval(() => {
sendMessage('ping');
options.pingTimeout = setTimeout(() => {
// 如果在超时时间内没有收到 pong则认为连接断开
reconnect();
}, options.pingTimeoutDuration);
}, options.heartBeatInterval);
};
// 停止心跳检查
const stopHeartBeat = () => {
clearInterval(options.heartBeatTimer);
resetPingTimeout();
};
// WebSocket 重连
const reconnect = () => {
if (options.destroy || !SocketTask.value) {
// 如果WebSocket已被销毁或尚未完全关闭不进行重连
return;
}
// 重连中
options.isReconnecting = true;
// 清除现有的重连标志,以避免多次重连
if (options.reconnectTimeout) {
clearTimeout(options.reconnectTimeout);
}
// 设置重连延迟
options.reconnectTimeout = setTimeout(() => {
// 检查组件是否仍在运行和WebSocket是否关闭
if (!options.destroy) {
// 重置重连标志
options.isReconnecting = false;
// 初始化新的WebSocket连接
initSocket();
}
}, options.reconnectInterval);
};
const resetPingTimeout = () => {
if (options.pingTimeout) {
clearTimeout(options.pingTimeout);
options.pingTimeout = null; // 清除超时ID
}
};
const close = () => {
options.destroy = true;
stopHeartBeat();
if (options.reconnectTimeout) {
clearTimeout(options.reconnectTimeout);
}
if (SocketTask.value) {
SocketTask.value.close();
SocketTask.value = null;
}
};
const initSocket = () => {
options.destroy = false;
copyValueToTarget(options, opt);
SocketTask.value = uni.connectSocket({
url: options.url,
complete: () => {
},
success: () => {
},
});
initEventListeners();
};
initSocket();
onBeforeUnmount(() => {
close();
});
return { options };
}