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/**
* websocket推送
* url ---链接地址
* time --执行检测时间
* @param (url:string,time:Number)
*/
class websocketUtil {
constructor(url, time) {
this.is_open_socket = false //避免重复连接
this.url = url //地址
this.data = null
/**
* 心跳检测
* */
this.timeout = time //多少秒执行检测
this.heartbeatInterval = null //检测服务器端是否还活着
this.reconnectTimeOut = null //重连之后多久再次重连
try {
return this.connectSocketInit()
} catch (e) {
console.log('catch');
this.is_open_socket = false
this.reconnect();
}
}
/**
* 进入这个页面的时候创建websocket连接【整个页面随时使用】
* */
connectSocketInit() {
this.socketTask = uni.connectSocket({
url: this.url,
success: () => {
console.log("正准备建立websocket中...");
// 返回实例
return this.socketTask
},
});
this.socketTask.onOpen((res) => {
console.log("WebSocket连接正常");
clearTimeout(this.reconnectTimeOut)
clearTimeout(this.heartbeatInterval)
this.is_open_socket = true;
this.start();
// 注:只有连接正常打开中 ,才能正常收到消息
// this.socketTask.onMessage((res) => {
// console.log(JSON.parse(res.data))
// });
})
// 监听连接失败这里代码我注释掉的原因是因为如果服务器关闭后和下面的onclose方法一起发起重连操作这样会导致重复连接
// uni.onSocketError((res) => {
// console.log('WebSocket连接打开失败请检查');
// this.is_open_socket = false;
// this.reconnect();
// });
/**
* 这里仅是事件监听【如果socket关闭了会执行】
*/
this.socketTask.onClose(() => {
console.log("已经被关闭了--socket关闭了会执行")
this.is_open_socket = false;
this.reconnect();
})
}
/**
* 发送消息
* */
send(value) {
// 注:只有连接正常打开中 ,才能正常成功发送消息
this.socketTask.send({
data: value,
async success() {
console.log("消息发送成功");
},
});
}
/**
* 开启心跳检测
* */
//开启心跳检测
start() {
this.heartbeatInterval = setTimeout(() => {
// this.data = { value: "传输内容", method: "方法名称" }
// console.log(this.data)
// this.send(JSON.stringify(this.data));
}, this.timeout)
}
/**
* 重新连接
*/
reconnect() {
//停止发送心跳
clearInterval(this.heartbeatInterval)
//如果不是人为关闭的话,进行重连
if (!this.is_open_socket) {
this.reconnectTimeOut = setTimeout(() => {
this.connectSocketInit();
}, 3000)
}
}
/**
* 外部获取消息
*/
getMessage(callback) {
this.socketTask.onMessage(res => {
return callback(res)
})
}
}
module.exports = websocketUtil