Spaces:
Sleeping
Sleeping
File size: 4,409 Bytes
2b24a67 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 |
'use strict'
const fs = require('fs/promises')
const fsm = require('fs-minipass')
const ssri = require('ssri')
const contentPath = require('./path')
const Pipeline = require('minipass-pipeline')
module.exports = read
const MAX_SINGLE_READ_SIZE = 64 * 1024 * 1024
async function read (cache, integrity, opts = {}) {
const { size } = opts
const { stat, cpath, sri } = await withContentSri(cache, integrity, async (cpath, sri) => {
// get size
const stat = await fs.stat(cpath)
return { stat, cpath, sri }
})
if (typeof size === 'number' && stat.size !== size) {
throw sizeError(size, stat.size)
}
if (stat.size > MAX_SINGLE_READ_SIZE) {
return readPipeline(cpath, stat.size, sri, new Pipeline()).concat()
}
const data = await fs.readFile(cpath, { encoding: null })
if (!ssri.checkData(data, sri)) {
throw integrityError(sri, cpath)
}
return data
}
const readPipeline = (cpath, size, sri, stream) => {
stream.push(
new fsm.ReadStream(cpath, {
size,
readSize: MAX_SINGLE_READ_SIZE,
}),
ssri.integrityStream({
integrity: sri,
size,
})
)
return stream
}
module.exports.stream = readStream
module.exports.readStream = readStream
function readStream (cache, integrity, opts = {}) {
const { size } = opts
const stream = new Pipeline()
// Set all this up to run on the stream and then just return the stream
Promise.resolve().then(async () => {
const { stat, cpath, sri } = await withContentSri(cache, integrity, async (cpath, sri) => {
// just stat to ensure it exists
const stat = await fs.stat(cpath)
return { stat, cpath, sri }
})
if (typeof size === 'number' && size !== stat.size) {
return stream.emit('error', sizeError(size, stat.size))
}
return readPipeline(cpath, stat.size, sri, stream)
}).catch(err => stream.emit('error', err))
return stream
}
module.exports.copy = copy
function copy (cache, integrity, dest) {
return withContentSri(cache, integrity, (cpath, sri) => {
return fs.copyFile(cpath, dest)
})
}
module.exports.hasContent = hasContent
async function hasContent (cache, integrity) {
if (!integrity) {
return false
}
try {
return await withContentSri(cache, integrity, async (cpath, sri) => {
const stat = await fs.stat(cpath)
return { size: stat.size, sri, stat }
})
} catch (err) {
if (err.code === 'ENOENT') {
return false
}
if (err.code === 'EPERM') {
/* istanbul ignore else */
if (process.platform !== 'win32') {
throw err
} else {
return false
}
}
}
}
async function withContentSri (cache, integrity, fn) {
const sri = ssri.parse(integrity)
// If `integrity` has multiple entries, pick the first digest
// with available local data.
const algo = sri.pickAlgorithm()
const digests = sri[algo]
if (digests.length <= 1) {
const cpath = contentPath(cache, digests[0])
return fn(cpath, digests[0])
} else {
// Can't use race here because a generic error can happen before
// a ENOENT error, and can happen before a valid result
const results = await Promise.all(digests.map(async (meta) => {
try {
return await withContentSri(cache, meta, fn)
} catch (err) {
if (err.code === 'ENOENT') {
return Object.assign(
new Error('No matching content found for ' + sri.toString()),
{ code: 'ENOENT' }
)
}
return err
}
}))
// Return the first non error if it is found
const result = results.find((r) => !(r instanceof Error))
if (result) {
return result
}
// Throw the No matching content found error
const enoentError = results.find((r) => r.code === 'ENOENT')
if (enoentError) {
throw enoentError
}
// Throw generic error
throw results.find((r) => r instanceof Error)
}
}
function sizeError (expected, found) {
/* eslint-disable-next-line max-len */
const err = new Error(`Bad data size: expected inserted data to be ${expected} bytes, but got ${found} instead`)
err.expected = expected
err.found = found
err.code = 'EBADSIZE'
return err
}
function integrityError (sri, path) {
const err = new Error(`Integrity verification failed for ${sri} (${path})`)
err.code = 'EINTEGRITY'
err.sri = sri
err.path = path
return err
}
|