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Matteo Collina
569369f927
Add mount/unmount lifecycle on `VirtualFileSystem`, a handler registry that fs.js and fs/promises.js consult via `vfsState.handlers`, and a router that maps absolute paths to the VFS that owns them. When a VFS is mounted, the public `fs.*` and `fs/promises` APIs (including streams, `fs.watch`, and `opendir`) dispatch to the provider for paths under the mount point, and fall through to the real filesystem otherwise. Includes per-method dispatch tests, error-path coverage, multi-mount routing tests, and router unit tests. Ref: https://github.com/nodejs/node/pull/63115 Signed-off-by: Matteo Collina <hello@matteocollina.com> PR-URL: https://github.com/nodejs/node/pull/63537 Refs: https://github.com/nodejs/node/pull/63115 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it>
78 lines
2.5 KiB
JavaScript
78 lines
2.5 KiB
JavaScript
// Flags: --experimental-vfs
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'use strict';
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// fs.open / fs.fstat / fs.read / fs.write / fs.close / fs.ftruncate callbacks
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// dispatch through VFS.
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const common = require('../common');
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const assert = require('assert');
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const fs = require('fs');
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const path = require('path');
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const vfs = require('node:vfs');
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const baseMountPoint = path.resolve('/tmp/vfs-open-cb-' + process.pid);
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let counter = 0;
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function mounted() {
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const mountPoint = baseMountPoint + '-' + (counter++);
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const myVfs = vfs.create();
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myVfs.mkdirSync('/src', { recursive: true });
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myVfs.writeFileSync('/src/hello.txt', 'hello world');
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myVfs.mount(mountPoint);
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return { myVfs, mountPoint };
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}
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// Open + fstat + read + close
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{
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const { myVfs, mountPoint } = mounted();
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fs.open(path.join(mountPoint, 'src/hello.txt'), 'r',
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common.mustSucceed((fd) => {
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assert.notStrictEqual(fd & 0x40000000, 0);
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fs.fstat(fd, common.mustSucceed((stats) => {
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assert.strictEqual(stats.isFile(), true);
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const buf = Buffer.alloc(11);
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fs.read(fd, buf, 0, 11, 0,
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common.mustSucceed((n, buffer) => {
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assert.strictEqual(n, 11);
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assert.strictEqual(buffer.toString(), 'hello world');
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fs.close(fd,
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common.mustSucceed(() => myVfs.unmount()));
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}));
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}));
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}));
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}
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// Open + write + close
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{
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const { myVfs, mountPoint } = mounted();
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fs.open(path.join(mountPoint, 'src/aw.txt'), 'w',
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common.mustSucceed((fd) => {
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const data = Buffer.from('async-fd');
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fs.write(fd, data, 0, data.length, 0,
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common.mustSucceed((n) => {
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assert.strictEqual(n, data.length);
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fs.close(fd, common.mustSucceed(() => {
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assert.strictEqual(
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fs.readFileSync(
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path.join(mountPoint, 'src/aw.txt'), 'utf8'),
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'async-fd',
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);
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myVfs.unmount();
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}));
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}));
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}));
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}
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// ftruncate (cb)
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{
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const { myVfs, mountPoint } = mounted();
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const fd = fs.openSync(path.join(mountPoint, 'src/hello.txt'), 'r+');
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fs.ftruncate(fd, 5, common.mustSucceed(() => {
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fs.closeSync(fd);
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assert.strictEqual(
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fs.readFileSync(path.join(mountPoint, 'src/hello.txt'), 'utf8'),
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'hello',
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);
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myVfs.unmount();
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}));
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}
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