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'use strict'
const BB = require('bluebird')
const extractionWorker = require('./worker.js')
const figgyPudding = require('figgy-pudding')
const npa = require('npm-package-arg')
const WORKER_PATH = require.resolve('./worker.js')
let workerFarm
// Broken for now, cause too many issues on some systems.
const ENABLE_WORKERS = false
const ExtractOpts = figgyPudding({
log: {},
dirPacker: {}
})
module.exports = {
startWorkers () {
if (ENABLE_WORKERS) {
if (!workerFarm) { workerFarm = require('worker-farm') }
this._workers = workerFarm({
maxConcurrentCallsPerWorker: 20,
maxRetries: 1
}, WORKER_PATH)
}
},
stopWorkers () {
if (ENABLE_WORKERS) {
if (!workerFarm) { workerFarm = require('worker-farm') }
workerFarm.end(this._workers)
}
},
child (name, child, childPath, opts) {
opts = ExtractOpts(opts)
const spec = npa.resolve(name, child.version)
let childOpts = opts.concat({
integrity: child.integrity,
resolved: child.resolved
})
const args = [spec, childPath, childOpts]
return BB.fromNode((cb) => {
let launcher = extractionWorker
let msg = args
const spec = typeof args[0] === 'string' ? npa(args[0]) : args[0]
if (ENABLE_WORKERS && (spec.registry || spec.type === 'remote')) {
if (!workerFarm) { workerFarm = require('worker-farm') }
// We can't serialize these options
childOpts = childOpts.concat({
log: null,
dirPacker: null
})
// workers will run things in parallel!
launcher = this._workers
try {
msg = JSON.stringify(msg)
} catch (e) {
return cb(e)
}
}
launcher(msg, cb)
})
}
}