source: trip-planner-front/node_modules/infer-owner/index.js@ 6a3a178

Last change on this file since 6a3a178 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

  • Property mode set to 100644
File size: 1.7 KB
Line 
1const cache = new Map()
2const fs = require('fs')
3const { dirname, resolve } = require('path')
4
5
6const lstat = path => new Promise((res, rej) =>
7 fs.lstat(path, (er, st) => er ? rej(er) : res(st)))
8
9const inferOwner = path => {
10 path = resolve(path)
11 if (cache.has(path))
12 return Promise.resolve(cache.get(path))
13
14 const statThen = st => {
15 const { uid, gid } = st
16 cache.set(path, { uid, gid })
17 return { uid, gid }
18 }
19 const parent = dirname(path)
20 const parentTrap = parent === path ? null : er => {
21 return inferOwner(parent).then((owner) => {
22 cache.set(path, owner)
23 return owner
24 })
25 }
26 return lstat(path).then(statThen, parentTrap)
27}
28
29const inferOwnerSync = path => {
30 path = resolve(path)
31 if (cache.has(path))
32 return cache.get(path)
33
34 const parent = dirname(path)
35
36 // avoid obscuring call site by re-throwing
37 // "catch" the error by returning from a finally,
38 // only if we're not at the root, and the parent call works.
39 let threw = true
40 try {
41 const st = fs.lstatSync(path)
42 threw = false
43 const { uid, gid } = st
44 cache.set(path, { uid, gid })
45 return { uid, gid }
46 } finally {
47 if (threw && parent !== path) {
48 const owner = inferOwnerSync(parent)
49 cache.set(path, owner)
50 return owner // eslint-disable-line no-unsafe-finally
51 }
52 }
53}
54
55const inflight = new Map()
56module.exports = path => {
57 path = resolve(path)
58 if (inflight.has(path))
59 return Promise.resolve(inflight.get(path))
60 const p = inferOwner(path).then(owner => {
61 inflight.delete(path)
62 return owner
63 })
64 inflight.set(path, p)
65 return p
66}
67module.exports.sync = inferOwnerSync
68module.exports.clearCache = () => {
69 cache.clear()
70 inflight.clear()
71}
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