I have a problem with svg2png package on Heroku. It works on my machine locally (Windows), but I can't get it working on Heroku free dyno.
The idea is to get svg from Wikipedia and return it as png. I've exposed two endpoints:
- / - that uses code stored in separated file,
- /simple - same code, but just in the callback.
When browsing both endpoints I receive Heroku Application error page. That's what I get in Heroku logs for both requests:
TypeError: Bad argument
Do you have an idea?
index.js
const svg2png = require('svg2png')
const axios = require('axios')
const express = require('express')
const bodyParser = require('body-parser')
const conv = require('./conv')
const svgUrl = 'https://upload.wikimedia.org/wikipedia/commons/0/02/SVG_logo.svg'
const app = express()
app.use(bodyParser.json({limit:'5mb'}))
app.use(bodyParser.urlencoded({extended:true,limit:'5mb'}))
app.get('/simple', function (req, res) {
axios.get(svgUrl)
.then(response => {
return svg2png(response.data, { width: 150, height: 150 })
})
.then(pngFile => {
var img = new Buffer(pngFile, 'base64')
res.writeHead(200, {
'Content-Type': 'image/png',
'Content-Length': img.length
})
res.end(img)
})
})
app.get('/', function (req, res) {
conv.send()
.then(pngFile => {
var img = new Buffer(pngFile, 'base64')
res.writeHead(200, {
'Content-Type': 'image/png',
'Content-Length': img.length
})
res.end(img)
})
})
app.listen(process.env.PORT || 5000, function () {
console.log('Application started')
})
conv.js
const axios = require('axios')
const svg2png = require('svg2png')
module.exports = {
send() {
const self = this;
self.width = 300;
self.height = 300;
const svgUrl = 'https://upload.wikimedia.org/wikipedia/commons/0/02/SVG_logo.svg'
return new Promise((resolve, reject) => {
axios.get(svgUrl)
.then(response =>
svg2png(response.data,
{ width: self.width, height: self.height })
.then(img=>resolve(img))
.catch(e => {
console.log('Something went wrong during svg2png conversion.' + e)
reject(e)
}))
});
}
}
via Robert Skarżycki
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