javascript 使用 nodejs aws sdk 将生成的 pdf 上传到 AWS S3
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Upload pdf generated to AWS S3 using nodejs aws sdk
提问by Shivendra Soni
I am using pdfkit to generate a pdf with some custom content and then sending it to an AWS S3 bucket.
我正在使用 pdfkit 生成带有一些自定义内容的 pdf，然后将其发送到 AWS S3 存储桶。
While if I generate the file as a whole and upload it works perfectly, however, if I want to stream the generated file probably as an octet stream I am not able to find any relevant pointers.
虽然如果我将文件作为一个整体生成并上传它可以完美运行，但是，如果我想将生成的文件作为八位字节流进行流式传输，我将无法找到任何相关的指针。
I am looking for a nodejs solution (or suggestion).
我正在寻找 nodejs 解决方案（或建议）。
回答by Shivendra Soni
I'll try to be precise here. I will not be covering usage of pdfKit's nodejs sdk in much detail.
我会在这里尽量准确。我不会详细介绍pdfKit的 nodejs sdk 的使用。
IF you want your generated pdf as a file.
如果您希望将生成的 pdf 作为文件。
var PDFDocument = require('pdfkit');
// Create a document
doc = new PDFDocument();
// Pipe it's output somewhere, like to a file or HTTP response
doc.pipe(fs.createWriteStream('output.pdf'));
doc.text('Whatever content goes here');
doc.end();
var params = {
key : fileName,
body : './output.pdf',
bucket : 'bucketName',
contentType : 'application/pdf'
}
s3.putObject(params, function(err, response) {
});
However if you want to stream it ( to say S3 bucket in the context of question), then it is worth remembering that every pdfkit instance is a readable stream.
但是，如果您想流式传输它（在问题的上下文中说 S3 存储桶），那么值得记住的是，每个 pdfkit 实例都是一个可读的流。
And S3 expects a file, a buffer or a readable stream. So,
S3 需要一个文件、一个缓冲区或一个可读流。所以，
var doc = new PDFDocument();
// Pipe it's output somewhere, like to a file or HTTP response
doc.text("Text for your PDF");
doc.end();
var params = {
key : fileName,
body : doc,
bucket : 'bucketName',
contentType : 'application/pdf'
}
//notice use of the upload function, not the putObject function
s3.upload(params, function(err, response) {
});
