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