I'm trying to download some images, resize them, zip them, and serve from an endpoint using streams. I'm using sharp for the resizing and archiver for the zipping. I can get these packages to work on their own but not together.
Here's some example code:
const Hapi = require('hapi');
const archiver = require('archiver');
const sharp = require('sharp');
const request = require('request');
function foo() {
return new Promise((resolve, reject) => {
const imageStreams = [request('https://i.stack.imgur.com/tKsDb.png'), request('https://i.stack.imgur.com/EdUwb.png'), request('https://i.stack.imgur.com/5d55j.png')]
const zip = archiver('zip');
zip.on('error', e => console.log('zip error: ', e.message));
zip.on('entry', entry => console.log('appended ', entry.name));
resolve(zip);
process.nextTick(() => {
console.log('number of streams: ', imageStreams.length);
imageStreams.map((stream, j) => {
const resize = sharp().resize(100, 100);
return stream.pipe(resize);
})
.forEach((resizedImageStream, i) => {
console.log('appending ', i, ' to zip');
zip.append(resizedImageStream, { name: `${i}.png` });
});
console.log('finalizing zip');
zip.finalize();
});
});
}
const server = new Hapi.Server();
server.connection({port: 3000});
server.route({
method: 'GET',
path: '/',
handler: (request, reply) => {
foo().then(zip => reply(zip));
}
})
server.start();
Run it with:
npm init --yes && npm install hapi archiver sharp request && node index.js
This will create an endpoint at http://localhost:3000 which will fail to stream the zip file to the response.
The following will each make the download work:
- Removing the sharp transformation
- Replacing sharp with imagemagick-stream
- Only handling a single image, i.e.
imageStreams.slice(0, 1)
But I can't get it to work with multiple images and resizing at the same time.
