overleaf/services/filestore/app/js/ImageOptimiser.js

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const logger = require('logger-sharelatex')
const metrics = require('@overleaf/metrics')
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const { callbackify } = require('util')
const safeExec = require('./SafeExec').promises
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module.exports = {
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compressPng: callbackify(compressPng),
promises: {
compressPng
}
}
async function compressPng(localPath, callback) {
const timer = new metrics.Timer('compressPng')
const args = ['optipng', localPath]
const opts = {
timeout: 30 * 1000,
killSignal: 'SIGKILL'
}
try {
await safeExec(args, opts)
timer.done()
} catch (err) {
if (err.code === 'SIGKILL') {
logger.warn(
{ err, stderr: err.stderr, localPath },
'optimiser timeout reached'
)
} else {
throw err
}
}
}