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node.js writable buffer stream (pdfkit example)
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| /** | |
| * Convert PDFDocument to Base64 | |
| */ | |
| const PDFDocument = require('pdfkit'); | |
| const stream = require('./stream'); | |
| // crate document and write stream | |
| let doc = new PDFDocument(); | |
| let writeStream = new stream.WritableBufferStream(); | |
| // pip the document to write stream | |
| doc.pipe(writeStream); | |
| // add some content | |
| doc.text('Some text!', 100, 100); | |
| // end document | |
| doc.end() | |
| // wait for the writing to finish | |
| writeStream.on('finish', () => { | |
| // console log pdf as bas64 string | |
| console.log(writeStream.toBuffer().toString('base64')); | |
| }); | |
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| const stream = require('stream'); | |
| /** | |
| * Simple writable buffer stream | |
| * @docs: https://nodejs.org/api/stream.html#stream_writable_streams | |
| */ | |
| class WritableBufferStream extends stream.Writable { | |
| constructor(options) { | |
| super(options); | |
| this._chunks = []; | |
| } | |
| _write (chunk, enc, callback) { | |
| this._chunks.push(chunk); | |
| return callback(null); | |
| } | |
| _destroy(err, callback) { | |
| this._chunks = null; | |
| return callback(null); | |
| } | |
| toBuffer() { | |
| return Buffer.concat(this._chunks); | |
| } | |
| } | |
| module.exports = { WritableBufferStream } |
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