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'use strict'
const BB = require('bluebird')
const Fetcher = require('../fetch')
const fs = require('fs')
const pipe = require('mississippi').pipe
const through = require('mississippi').through
const readFileAsync = BB.promisify(fs.readFile)
const statAsync = BB.promisify(fs.stat)
const MAX_BULK_SIZE = 2 * 1024 * 1024 // 2MB
// `file` packages refer to local tarball files.
const fetchFile = module.exports = Object.create(null)
Fetcher.impl(fetchFile, {
manifest (spec, opts) {
// We can't do much here. `finalizeManifest` will take care of
// calling `tarball` to fill out all the necessary details.
return BB.resolve(null)
},
// All the heavy lifting for `file` packages is done here.
// They're never cached. We just read straight out of the file.
// TODO - maybe they *should* be cached?
tarball (spec, opts) {
const src = spec._resolved || spec.fetchSpec
const stream = through()
statAsync(src).then(stat => {
if (stat.size <= MAX_BULK_SIZE) {
// YAY LET'S DO THING IN BULK
return readFileAsync(src).then(data => {
stream.write(data, () => {
stream.end()
})
})
} else {
return pipe(fs.createReadStream(src), stream)
}
}, err => stream.emit('error', err))
return stream
},
fromManifest (manifest, spec, opts) {
return this.tarball(manifest || spec, opts)
}
})
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