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'use strict'
const BB = require('bluebird')
const cacache = require('cacache')
const finished = BB.promisify(require('mississippi').finished)
const optCheck = require('./lib/util/opt-check')
const npa = require('npm-package-arg')
module.exports = prefetch
function prefetch (spec, opts) {
opts = optCheck(opts)
spec = npa(spec, opts.where)
opts.log.warn('prefetch', 'pacote.prefetch() is deprecated. Please use pacote.tarball() instead.')
const startTime = Date.now()
if (!opts.cache) {
opts.log.info('prefetch', 'skipping prefetch: no cache provided')
return BB.resolve({ spec })
}
if (opts.integrity && !opts.preferOnline) {
opts.log.silly('prefetch', 'checking if', opts.integrity, 'is already cached')
return cacache.get.hasContent(opts.cache, opts.integrity).then(info => {
if (info) {
opts.log.silly('prefetch', `content already exists for ${spec} (${Date.now() - startTime}ms)`)
return {
spec,
integrity: info.integrity,
size: info.size,
byDigest: true
}
} else {
return prefetchByManifest(startTime, spec, opts)
}
})
} else {
opts.log.silly('prefetch', `no integrity hash provided for ${spec} - fetching by manifest`)
return prefetchByManifest(startTime, spec, opts)
}
}
let fetch
function prefetchByManifest (start, spec, opts) {
let manifest
let integrity
return BB.resolve().then(() => {
if (!fetch) {
fetch = require('./lib/fetch')
}
const stream = fetch.tarball(spec, opts)
if (!stream) { return }
stream.on('data', function () {})
stream.on('manifest', m => { manifest = m })
stream.on('integrity', i => { integrity = i })
return finished(stream)
}).then(() => {
opts.log.silly('prefetch', `${spec} done in ${Date.now() - start}ms`)
return {
manifest,
spec,
integrity: integrity || (manifest && manifest._integrity),
byDigest: false
}
})
}