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var asyncHooks = require('async_hooks')
var stackback = require('stackback')
var path = require('path')
var fs = require('fs')
var sep = path.sep
var active = new Map()
var hook = asyncHooks.createHook({
init (asyncId, type, triggerAsyncId, resource) {
if (type === 'TIMERWRAP' || type === 'PROMISE') return
if (type === 'PerformanceObserver' || type === 'RANDOMBYTESREQUEST') return
var err = new Error('whatevs')
var stacks = stackback(err)
active.set(asyncId, {type, stacks, resource})
},
destroy (asyncId) {
active.delete(asyncId)
}
})
hook.enable()
module.exports = whyIsNodeRunning
function whyIsNodeRunning (logger) {
if (!logger) logger = console
hook.disable()
var activeResources = [...active.values()].filter(function(r) {
if (
typeof r.resource.hasRef === 'function'
&& !r.resource.hasRef()
) return false
return true
})
logger.error('There are %d handle(s) keeping the process running', activeResources.length)
for (const o of activeResources) printStacks(o)
function printStacks (o) {
var stacks = o.stacks.slice(1).filter(function (s) {
var filename = s.getFileName()
return filename && filename.indexOf(sep) > -1 && filename.indexOf('internal' + sep) !== 0
})
logger.error('')
logger.error('# %s', o.type)
if (!stacks[0]) {
logger.error('(unknown stack trace)')
} else {
var padding = ''
stacks.forEach(function (s) {
var pad = (s.getFileName() + ':' + s.getLineNumber()).replace(/./g, ' ')
if (pad.length > padding.length) padding = pad
})
stacks.forEach(function (s) {
var prefix = s.getFileName() + ':' + s.getLineNumber()
try {
var src = fs.readFileSync(s.getFileName(), 'utf-8').split(/\n|\r\n/)
logger.error(prefix + padding.slice(prefix.length) + ' - ' + src[s.getLineNumber() - 1].trim())
} catch (e) {
logger.error(prefix + padding.slice(prefix.length))
}
})
}
}
}
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