Download image and resize in nodejs - node.js

Question

What I am trying to do is download an image from google into my system repository in the project folder /download. Next, I am trying to get the image from the download repository and resize and again save the resized image in /thumbnail repository. Below is the code which I have written
//Google URL
var mainuri = 'http://images.sadhguru.org/sites/default/files/media_files/iso/en/64083-natures-temples.jpg';
var dir = './download';
if (!fs.existsSync(dir)){
fs.mkdirSync(dir);
}
// CODE TO DOWNLOAD IMAGE FROM GOOGLE
var filename = dir+'/file.jpg';
request.head(mainuri, function(err, res, body){
console.log('content-type:', res.headers['content-type']);
console.log('content-length:', res.headers['content-length']);
request(mainuri).pipe(fs.createWriteStream(filename));
});
var resizedir = './thumbnail';
if (!fs.existsSync(resizedir)){
fs.mkdirSync(resizedir);
}
//CODE TO GET IMAGE FROM '/download' REPOSITORY AND RESIZE
var inputFile=require('path').join(__dirname,'../download/file.jpg'); //GET IMAGE FROM LOCAL
var outFile = 'thumbnail/newfile.jpg'; // SAVE RESIZED IMAGE PATH
// ------- CODE REMOVED - ERROR IS COMING HERE -----------
imageresize(inputFile, outFile); // FUNCTION THAT CONTAINS IMAGE RESIZE CODE
//imageresize FUNCTION
var imageresize = function(inputFile, outFile){
console.log(inputFile)
// input stream
let inStream = fs.createReadStream('C:/Users/rganji/caw/server/download/file.jpg');
// output stream
let outStream = fs.createWriteStream(outFile, {flags: "w"});
// on error of output file being saved
outStream.on('error', function() {
console.log("Error");
});
// on success of output file being saved
outStream.on('close', function() {
console.log("Successfully saved file");
});
// input stream transformer
// "info" event will be emitted on resize
let transform = sharp()
.resize({ width: 50, height: 50 })
.on('info', function(fileInfo) {
console.log("Resizing done, file not saved");
});
inStream.pipe(transform).pipe(outStream);
}
If I remove the code which I commented as CODE REMOVED - ERROR IS COMING HERE, then image is getting downloaded from google. If I call imageresize function then the /download directory is getting created but I couldnt find any image in the directory.
i.e, If I call the download from google and resizeimage functions separately, i.e calling image download from google first and imageresize next then they are working fine that is I can find images in both /download and /thumbnail directories. But If I call resizeimage function after google download then I couldnt find any image in both the repositories.

Answer 1

You need to wait for the image download to get finished before calling the imageresize function. Try this
request(mainuri).on('end', function() {
var inputFile=require('path').join(__dirname,'../download/file.jpg'); //GET IMAGE FROM LOCAL
var outFile = 'thumbnail/newfile.jpg'; // SAVE RESIZED IMAGE PATH
imageresize(inputFile, outFile);
});