使函数同步node.js
使函数同步node.js
提问于 2021-08-29 14:21:53
我有一个问题，那就是文件在被读出之前还不存在。结果，我一直收到错误消息no such File。据我所知，fs.writeFileSync();应该解决这个问题...？
模块中的函数：
setup: function(server, RAM, client, message) {
const dc = require("../libs/dcTools.js");
const db = require('../libs/dbTools.js');
const fs = require('fs');
const channel = dc.getChannel(message, server.dashboard.channel);
const dashboard = this.create(server, RAM, client);
channel.send(dashboard).then(msg => {
//that is the line ↓
fs.writeFileSync(`./RAM/${server.id}/dsbdmsgid.txt`, msg.id);
console.log('done');
});
//and this line produces the error ↓
const msg = fs.readFileSync(`./RAM/${server.id}/dsbdmsgid.txt`, 'utf8');
return msg;
},调用该函数的函数：
execute(server, message) {
const fs = require('fs');
const db = require('../../libs/dbTools.js');
const dashboard = require('../../modules/dashboard.js');
if (args[0] == "setup") {
server.dashboard.channel = message.channel.id;
//function ↓
server.dashboard.msg = dashboard.setup(server, message);
console.log('ready');
server.dashboard.mod = true;
db.updateServer(server);
} else if (args[0] == "off") {
server.dashboard.mod = false;
db.updateServer(server);
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2021-08-29 15:51:11
您的setup函数需要是异步的，请对函数声明进行以下更改：
setup: async function(server, RAM, client, message) {
const dc = require("../libs/dcTools.js");
const db = require('../libs/dbTools.js');
const fs = require('fs');
const channel = dc.getChannel(message, server.dashboard.channel);
const dashboard = this.create(server, RAM, client);
channel.send(dashboard).then(msg => {
//that is the line ↓
fs.writeFileSync(`./RAM/${server.id}/dsbdmsgid.txt`, msg.id);
console.log('done');
});
//and this line produces the error ↓
const msg = fs.readFileSync(`./RAM/${server.id}/dsbdmsgid.txt`, 'utf8');
return msg;
}现在调用该函数：
dashboard.setup(server, message).then((msg) => {
// Use the returned value of msg
})这应该是可行的，但我建议使用fs.readFile而不是fs.readFileSync，因为它会在执行I/O时阻塞单线程循环，并且其他进程在完成之前无法继续。
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原文链接：
https://stackoverflow.com/questions/68973823
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