[英]How in Koa send generated file
I need to make a pdf file with user content and send it back. 我需要制作一个包含用户内容的pdf文件,然后将其发送回去。 I chose pdfmake , because then can make a tables.
我选择了pdfmake ,因为这样可以制作表格。 I use Koa .js;
我使用Koa .js;
router.post('/pdf', koaBody(), async ctx => {
const doc = printer.createPdfKitDocument(myFunctionGeneratePDFBody(ctx.request.body));
doc.pipe(ctx.res, { end: false });
doc.end();
ctx.res.writeHead(200, {
'Content-Type': 'application/pdf',
"Content-Disposition": "attachment; filename=document.pdf",
});
ctx.res.end();
});
And get an error 并得到一个错误
Error [ERR_STREAM_WRITE_AFTER_END]: write after end
at write_ (_http_outgoing.js:572:17)
at ServerResponse.write (_http_outgoing.js:567:10)
at PDFDocument.ondata (_stream_readable.js:666:20)
at PDFDocument.emit (events.js:182:13)
at PDFDocument.EventEmitter.emit (domain.js:442:20)
at PDFDocument.Readable.read (_stream_readable.js:486:10)
at flow (_stream_readable.js:922:34)
at resume_ (_stream_readable.js:904:3)
at process._tickCallback (internal/process/next_tick.js:63:19)
But save in intermediate file and send its work ... 但是保存在中间文件中并发送其工作...
router.post('/pdf', koaBody(), async ctx => {
await new Promise((resolve, reject) => {
const doc = printer.createPdfKitDocument(generatePDF(ctx.request.body));
doc.pipe(fs.createWriteStream(__dirname + '/document.pdf'));
doc.end();
doc.on('error', reject);
doc.on('end', resolve);
})
.then(async () => {
ctx.res.writeHead(200, {
'Content-Type': 'application/pdf',
'Content-Disposition': 'attachment; filename=document.pdf',
});
const stream = fs.createReadStream(__dirname + '/document.pdf');
return new Promise((resolve, reject) => {
stream.pipe(ctx.res, { end: false });
stream.on('error', reject);
stream.on('end', resolve);
});
});
ctx.res.end();
});
Avoid using writeHead
, see https://koajs.com/#response . 避免使用
writeHead
,请参阅https://koajs.com/#response 。
Do like this: 这样做:
ctx.attachment('file.pdf');
ctx.type =
'application/pdf';
const stream = fs.createReadStream(`${process.cwd()}/uploads/file.pdf`);
ctx.ok(stream); // from https://github.com/jeffijoe/koa-respond
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