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import timeout from 'express-timeout-handler'

import statsd from '../lib/statsd.js'

// Heroku router requests timeout after 30 seconds. We should stop them earlier!

const maxRequestTimeout = parseInt(process.env.REQUEST_TIMEOUT, 10) || 10000

export default timeout.handler({

// Default timeout for all endpoints

// To override for a given router/endpoint, use `xExpressTimeoutHandler.set(...)`

timeout: maxRequestTimeout,

// IMPORTANT:

// We cannot allow the middleware to disable the `res` object's methods like

// it does by default if we want to use `next` in the `onTimeout` handler!

disable: [],

onTimeout: function (req, res, next) {

// The `req.pagePath` can come later so it's not guaranteed to always

// be present. It's added by the `handle-next-data-path.js` middleware

// we translates those "cryptic" `/_next/data/...` URLs from

// client-side routing.

const incrementTags = [`path:${req.pagePath || req.path}`]

if (req.context?.currentCategory) {

incrementTags.push(`product:${req.context.currentCategory}`)

}

statsd.increment('middleware.timeout', 1, incrementTags)

// Create a custom timeout error

const timeoutError = new Error('Request timed out')

timeoutError.statusCode = 503

timeoutError.code = 'ETIMEDOUT'

// Pass the error to our Express error handler for consolidated processing

return next(timeoutError)

// Can also set an `onDelayedResponse` property IF AND ONLY IF you allow for disabling methods

})