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| author | pack <pack@packgekko.xyz> | 2026-08-09 10:37:07 +0000 |
|---|---|---|
| committer | pack <pack@packgekko.xyz> | 2026-08-09 10:37:07 +0000 |
| commit | 55a4f1fc869e41aca748c63d3018f0448b1606e0 (patch) | |
| tree | d132d1d01772b6d53faee3e63c534dea5706b78a /node_modules/tar/dist/esm/path-reservations.js | |
| download | crud-55a4f1fc869e41aca748c63d3018f0448b1606e0.tar.gz | |
first commit
Diffstat (limited to '')
| -rw-r--r-- | node_modules/tar/dist/esm/path-reservations.js | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/node_modules/tar/dist/esm/path-reservations.js b/node_modules/tar/dist/esm/path-reservations.js new file mode 100644 index 0000000..117f6be --- /dev/null +++ b/node_modules/tar/dist/esm/path-reservations.js @@ -0,0 +1,166 @@ +// A path exclusive reservation system +// reserve([list, of, paths], fn) +// When the fn is first in line for all its paths, it +// is called with a cb that clears the reservation. +// +// Used by async unpack to avoid clobbering paths in use, +// while still allowing maximal safe parallelization. +import { join } from 'node:path'; +import { normalizeUnicode } from './normalize-unicode.js'; +import { stripTrailingSlashes } from './strip-trailing-slashes.js'; +const platform = process.env.TESTING_TAR_FAKE_PLATFORM || process.platform; +const isWindows = platform === 'win32'; +// return a set of parent dirs for a given path +// '/a/b/c/d' -> ['/', '/a', '/a/b', '/a/b/c', '/a/b/c/d'] +const getDirs = (path) => { + const dirs = path + .split('/') + .slice(0, -1) + .reduce((set, path) => { + const s = set.at(-1); + if (s !== undefined) { + path = join(s, path); + } + set.push(path || '/'); + return set; + }, []); + return dirs; +}; +export class PathReservations { + // path => [function or Set] + // A Set object means a directory reservation + // A fn is a direct reservation on that path + #queues = new Map(); + // fn => {paths:[path,...], dirs:[path, ...]} + #reservations = new Map(); + // functions currently running + #running = new Set(); + reserve(paths, fn) { + paths = + isWindows ? + ['win32 parallelization disabled'] + : paths.map(p => { + // don't need normPath, because we skip this entirely for windows + return stripTrailingSlashes(join(normalizeUnicode(p))); + }); + const dirs = new Set(paths.map(path => getDirs(path)).reduce((a, b) => a.concat(b))); + this.#reservations.set(fn, { dirs, paths }); + for (const p of paths) { + const q = this.#queues.get(p); + if (!q) { + this.#queues.set(p, [fn]); + } + else { + q.push(fn); + } + } + for (const dir of dirs) { + const q = this.#queues.get(dir); + if (!q) { + this.#queues.set(dir, [new Set([fn])]); + } + else { + const l = q.at(-1); + if (l instanceof Set) { + l.add(fn); + } + else { + q.push(new Set([fn])); + } + } + } + return this.#run(fn); + } + // return the queues for each path the function cares about + // fn => {paths, dirs} + #getQueues(fn) { + const res = this.#reservations.get(fn); + /* c8 ignore start */ + if (!res) { + throw new Error('function does not have any path reservations'); + } + /* c8 ignore stop */ + return { + paths: res.paths.map((path) => this.#queues.get(path)), + dirs: [...res.dirs].map(path => this.#queues.get(path)), + }; + } + // check if fn is first in line for all its paths, and is + // included in the first set for all its dir queues + check(fn) { + const { paths, dirs } = this.#getQueues(fn); + return (paths.every(q => q && q[0] === fn) && + dirs.every(q => q && q[0] instanceof Set && q[0].has(fn))); + } + // run the function if it's first in line and not already running + #run(fn) { + if (this.#running.has(fn) || !this.check(fn)) { + return false; + } + this.#running.add(fn); + fn(() => this.#clear(fn)); + return true; + } + #clear(fn) { + if (!this.#running.has(fn)) { + return false; + } + const res = this.#reservations.get(fn); + /* c8 ignore start */ + if (!res) { + throw new Error('invalid reservation'); + } + /* c8 ignore stop */ + const { paths, dirs } = res; + const next = new Set(); + for (const path of paths) { + const q = this.#queues.get(path); + /* c8 ignore start */ + if (!q || q?.[0] !== fn) { + continue; + } + /* c8 ignore stop */ + const q0 = q[1]; + if (!q0) { + this.#queues.delete(path); + continue; + } + q.shift(); + if (typeof q0 === 'function') { + next.add(q0); + } + else { + for (const f of q0) { + next.add(f); + } + } + } + for (const dir of dirs) { + const q = this.#queues.get(dir); + const q0 = q?.[0]; + /* c8 ignore next - type safety only */ + if (!q || !(q0 instanceof Set)) + continue; + if (q0.size === 1 && q.length === 1) { + this.#queues.delete(dir); + continue; + } + else if (q0.size === 1) { + q.shift(); + // next one must be a function, + // or else the Set would've been reused + const n = q[0]; + if (typeof n === 'function') { + next.add(n); + } + } + else { + q0.delete(fn); + } + } + this.#running.delete(fn); + next.forEach(fn => this.#run(fn)); + return true; + } +} +//# sourceMappingURL=path-reservations.js.map
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