有人使用koa.js和溪流吗?
考虑这个例子
const fs = require('fs');
const Koa = require('koa');
const app = new Koa();
app.use(async (ctx) => {
ctx.body = fs.createReadStream('really-large-file');
});
app.listen(4000);
如果用户中止请求我得到
Error: read ECONNRESET
at _errnoException (util.js:1024:11)
at TCP.onread (net.js:618:25)
或
Error: write EPIPE
at _errnoException (util.js:1024:11)
at WriteWrap.afterWrite [as oncomplete] (net.js:870:14)
处理此类错误的正确方法是什么?
P.S。请求中止快递后我没有错误
const fs = require('fs');
const express = require('express');
const app = express();
app.get('/', (req, res) => {
fs.createReadStream('really-large-file').pipe(res);
});
app.listen(4000);
P.P.S。我已经尝试了
app.use(async (ctx) => {
fs.createReadStream('really-large-file').pipe(ctx.res);
ctx.respond = false;
});
但它没有效果。
答案 0 :(得分:1)
使用gloabel错误处理程序。见https://github.com/koajs/koa/wiki/Error-Handling
const fs = require('fs');
const Koa = require('koa');
const app = new Koa();
app.use(async (ctx, next) => {
try {
await next();
} catch (err) {
ctx.status = err.status || 500;
ctx.body = err.message;
ctx.app.emit('error', err, ctx);
}
});
app.use(async (ctx) => {
ctx.body = await openFile();
});
function openFile(){
return new Promise((resolve,reject)=>{
var stream = fs.createReadStream("really-large-file")
var data
stream.on("error",err=>reject(err))
stream.on("data",chunk=>data+=chunk)
stream.on("end",()=>resolve(data))
})
}
app.listen(4000);