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/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import * as fs from 'fs';
import { EMPTY, Observable, concat, from as observableFrom, throwError } from 'rxjs';
import {
concatMap,
ignoreElements,
map,
mergeMap,
publish,
refCount,
} from 'rxjs/operators';
import {
Path,
PathFragment,
dirname,
fragment,
getSystemPath,
join,
normalize,
virtualFs,
} from '../src';
interface ChokidarWatcher {
new (options: {}): ChokidarWatcher;
add(path: string): ChokidarWatcher;
on(type: 'change', cb: (path: string) => void): ChokidarWatcher;
on(type: 'add', cb: (path: string) => void): ChokidarWatcher;
on(type: 'unlink', cb: (path: string) => void): ChokidarWatcher;
close(): void;
}
const { FSWatcher }: { FSWatcher: ChokidarWatcher } = require('chokidar');
type FsFunction0<R> = (cb: (err?: Error, result?: R) => void) => void;
type FsFunction1<R, T1> = (p1: T1, cb: (err?: Error, result?: R) => void) => void;
type FsFunction2<R, T1, T2>
= (p1: T1, p2: T2, cb: (err?: Error, result?: R) => void) => void;
function _callFs<R>(fn: FsFunction0<R>): Observable<R>;
function _callFs<R, T1>(fn: FsFunction1<R, T1>, p1: T1): Observable<R>;
function _callFs<R, T1, T2>(fn: FsFunction2<R, T1, T2>, p1: T1, p2: T2): Observable<R>;
function _callFs<ResultT>(fn: Function, ...args: {}[]): Observable<ResultT> {
return new Observable(obs => {
fn(...args, (err?: Error, result?: ResultT) => {
if (err) {
obs.error(err);
} else {
obs.next(result);
obs.complete();
}
});
});
}
/**
* An implementation of the Virtual FS using Node as the background. There are two versions; one
* synchronous and one asynchronous.
*/
export class NodeJsAsyncHost implements virtualFs.Host<fs.Stats> {
get capabilities(): virtualFs.HostCapabilities {
return { synchronous: false };
}
write(path: Path, content: virtualFs.FileBuffer): Observable<void> {
return new Observable<void>(obs => {
// Create folders if necessary.
const _createDir = (path: Path) => {
if (fs.existsSync(getSystemPath(path))) {
return;
}
if (dirname(path) === path) {
throw new Error();
}
_createDir(dirname(path));
fs.mkdirSync(getSystemPath(path));
};
_createDir(dirname(path));
_callFs<void, string, Uint8Array>(
fs.writeFile,
getSystemPath(path),
new Uint8Array(content),
).subscribe(obs);
});
}
read(path: Path): Observable<virtualFs.FileBuffer> {
return _callFs(fs.readFile, getSystemPath(path)).pipe(
map(buffer => new Uint8Array(buffer).buffer as virtualFs.FileBuffer),
);
}
delete(path: Path): Observable<void> {
return this.isDirectory(path).pipe(
mergeMap(isDirectory => {
if (isDirectory) {
const allFiles: Path[] = [];
const allDirs: Path[] = [];
const _recurseList = (path: Path) => {
for (const fragment of fs.readdirSync(getSystemPath(path))) {
if (fs.statSync(getSystemPath(join(path, fragment))).isDirectory()) {
_recurseList(join(path, fragment));
allDirs.push(join(path, fragment));
} else {
allFiles.push(join(path, fragment));
}
}
};
_recurseList(path);
return concat(
observableFrom(allFiles).pipe(
mergeMap(p => _callFs(fs.unlink, getSystemPath(p))),
ignoreElements(),
),
observableFrom(allDirs).pipe(
concatMap(p => _callFs(fs.rmdir, getSystemPath(p))),
map(() => {}),
),
);
} else {
return _callFs(fs.unlink, getSystemPath(path));
}
}),
);
}
rename(from: Path, to: Path): Observable<void> {
return _callFs(fs.rename, getSystemPath(from), getSystemPath(to));
}
list(path: Path): Observable<PathFragment[]> {
return _callFs(fs.readdir, getSystemPath(path)).pipe(
map(names => names.map(name => fragment(name))),
);
}
exists(path: Path): Observable<boolean> {
// Exists is a special case because it cannot error.
return new Observable(obs => {
fs.exists(path, exists => {
obs.next(exists);
obs.complete();
});
});
}
isDirectory(path: Path): Observable<boolean> {
return _callFs(fs.stat, getSystemPath(path)).pipe(
map(stat => stat.isDirectory()),
);
}
isFile(path: Path): Observable<boolean> {
return _callFs(fs.stat, getSystemPath(path)).pipe(
map(stat => stat.isDirectory()),
);
}
// Some hosts may not support stat.
stat(path: Path): Observable<virtualFs.Stats<fs.Stats>> | null {
return _callFs(fs.stat, getSystemPath(path));
}
// Some hosts may not support watching.
watch(
path: Path,
_options?: virtualFs.HostWatchOptions,
): Observable<virtualFs.HostWatchEvent> | null {
return new Observable<virtualFs.HostWatchEvent>(obs => {
const watcher = new FSWatcher({ persistent: true }).add(getSystemPath(path));
watcher
.on('change', path => {
obs.next({
path: normalize(path),
time: new Date(),
type: virtualFs.HostWatchEventType.Changed,
});
})
.on('add', path => {
obs.next({
path: normalize(path),
time: new Date(),
type: virtualFs.HostWatchEventType.Created,
});
})
.on('unlink', path => {
obs.next({
path: normalize(path),
time: new Date(),
type: virtualFs.HostWatchEventType.Deleted,
});
});
return () => watcher.close();
}).pipe(
publish(),
refCount(),
);
}
}
/**
* An implementation of the Virtual FS using Node as the backend, synchronously.
*/
export class NodeJsSyncHost implements virtualFs.Host<fs.Stats> {
get capabilities(): virtualFs.HostCapabilities {
return { synchronous: true };
}
write(path: Path, content: virtualFs.FileBuffer): Observable<void> {
return new Observable(obs => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
try {
// Create folders if necessary.
const _createDir = (path: Path) => {
if (fs.existsSync(getSystemPath(path))) {
return;
}
_createDir(dirname(path));
fs.mkdirSync(getSystemPath(path));
};
_createDir(dirname(path));
fs.writeFileSync(getSystemPath(path), new Uint8Array(content));
obs.next();
obs.complete();
} catch (err) {
obs.error(err);
}
});
}
read(path: Path): Observable<virtualFs.FileBuffer> {
return new Observable(obs => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
try {
const buffer = fs.readFileSync(getSystemPath(path));
obs.next(new Uint8Array(buffer).buffer as virtualFs.FileBuffer);
obs.complete();
} catch (err) {
obs.error(err);
}
});
}
delete(path: Path): Observable<void> {
return this.isDirectory(path).pipe(
concatMap(isDir => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
if (isDir) {
const dirPaths = fs.readdirSync(getSystemPath(path));
const rmDirComplete = new Observable((obs) => {
try {
fs.rmdirSync(getSystemPath(path));
obs.complete();
} catch (e) {
obs.error(e);
}
});
return concat(
...dirPaths.map(name => this.delete(join(path, name))),
rmDirComplete,
);
} else {
try {
fs.unlinkSync(getSystemPath(path));
} catch (err) {
return throwError(err);
}
return EMPTY;
}
}),
);
}
rename(from: Path, to: Path): Observable<void> {
return new Observable(obs => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
try {
fs.renameSync(getSystemPath(from), getSystemPath(to));
obs.next();
obs.complete();
} catch (err) {
obs.error(err);
}
});
}
list(path: Path): Observable<PathFragment[]> {
return new Observable(obs => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
try {
const names = fs.readdirSync(getSystemPath(path));
obs.next(names.map(name => fragment(name)));
obs.complete();
} catch (err) {
obs.error(err);
}
});
}
exists(path: Path): Observable<boolean> {
return new Observable(obs => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
try {
obs.next(fs.existsSync(getSystemPath(path)));
obs.complete();
} catch (err) {
obs.error(err);
}
});
}
isDirectory(path: Path): Observable<boolean> {
// tslint:disable-next-line:no-non-null-assertion
return this.stat(path) !.pipe(map(stat => stat.isDirectory()));
}
isFile(path: Path): Observable<boolean> {
// tslint:disable-next-line:no-non-null-assertion
return this.stat(path) !.pipe(map(stat => stat.isFile()));
}
// Some hosts may not support stat.
stat(path: Path): Observable<virtualFs.Stats<fs.Stats>> {
return new Observable(obs => {
// TODO: remove this try+catch when issue https://github.com/ReactiveX/rxjs/issues/3740 is
// fixed.
try {
obs.next(fs.statSync(getSystemPath(path)));
obs.complete();
} catch (err) {
obs.error(err);
}
});
}
// Some hosts may not support watching.
watch(
path: Path,
_options?: virtualFs.HostWatchOptions,
): Observable<virtualFs.HostWatchEvent> | null {
return new Observable<virtualFs.HostWatchEvent>(obs => {
const opts = { persistent: false };
const watcher = new FSWatcher(opts).add(getSystemPath(path));
watcher
.on('change', path => {
obs.next({
path: normalize(path),
time: new Date(),
type: virtualFs.HostWatchEventType.Changed,
});
})
.on('add', path => {
obs.next({
path: normalize(path),
time: new Date(),
type: virtualFs.HostWatchEventType.Created,
});
})
.on('unlink', path => {
obs.next({
path: normalize(path),
time: new Date(),
type: virtualFs.HostWatchEventType.Deleted,
});
});
return () => watcher.close();
}).pipe(
publish(),
refCount(),
);
}
}