angular-cn/aio/aio-builds-setup/dockerbuild/scripts-js/lib/preview-server/build-creator.ts

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// Imports
import * as cp from 'child_process';
import {EventEmitter} from 'events';
import * as fs from 'fs';
import * as path from 'path';
import * as shell from 'shelljs';
import {HIDDEN_DIR_PREFIX} from '../common/constants';
import {assertNotMissingOrEmpty, computeShortSha, createLogger} from '../common/utils';
import {ChangedPrVisibilityEvent, CreatedBuildEvent} from './build-events';
import {PreviewServerError} from './preview-error';
// Classes
export class BuildCreator extends EventEmitter {
private logger = createLogger('BuildCreator');
// Constructor
constructor(protected buildsDir: string) {
super();
assertNotMissingOrEmpty('buildsDir', buildsDir);
}
// Methods - Public
public create(pr: number, sha: string, archivePath: string, isPublic: boolean): Promise<void> {
// Use only part of the SHA for more readable URLs.
sha = computeShortSha(sha);
const {newPrDir: prDir} = this.getCandidatePrDirs(pr, isPublic);
const shaDir = path.join(prDir, sha);
let dirToRemoveOnError: string;
return Promise.resolve().
// If the same PR exists with different visibility, update the visibility first.
then(() => this.updatePrVisibility(pr, isPublic)).
then(() => Promise.all([this.exists(prDir), this.exists(shaDir)])).
then(([prDirExisted, shaDirExisted]) => {
if (shaDirExisted) {
const publicOrNot = isPublic ? 'public' : 'non-public';
throw new PreviewServerError(409, `Request to overwrite existing ${publicOrNot} directory: ${shaDir}`);
}
dirToRemoveOnError = prDirExisted ? shaDir : prDir;
return Promise.resolve().
then(() => shell.mkdir('-p', shaDir)).
then(() => this.extractArchive(archivePath, shaDir)).
then(() => this.emit(CreatedBuildEvent.type, new CreatedBuildEvent(+pr, sha, isPublic))).
then(() => undefined);
}).
catch(err => {
if (dirToRemoveOnError) {
shell.rm('-rf', dirToRemoveOnError);
}
if (!(err instanceof PreviewServerError)) {
err = new PreviewServerError(500, `Error while creating preview at: ${shaDir}\n${err}`);
}
throw err;
});
}
public updatePrVisibility(pr: number, makePublic: boolean): Promise<boolean> {
const {oldPrDir: otherVisPrDir, newPrDir: targetVisPrDir} = this.getCandidatePrDirs(pr, makePublic);
return Promise.
all([this.exists(otherVisPrDir), this.exists(targetVisPrDir)]).
then(([otherVisPrDirExisted, targetVisPrDirExisted]) => {
if (!otherVisPrDirExisted) {
// No visibility change: Either the visibility is up-to-date or the PR does not exist.
return false;
} else if (targetVisPrDirExisted) {
// Error: Directories for both visibilities exist.
throw new PreviewServerError(409,
`Request to move '${otherVisPrDir}' to existing directory '${targetVisPrDir}'.`);
}
// Visibility change: Moving `otherVisPrDir` to `targetVisPrDir`.
return Promise.resolve().
then(() => shell.mv(otherVisPrDir, targetVisPrDir)).
then(() => this.listShasByDate(targetVisPrDir)).
then(shas => this.emit(ChangedPrVisibilityEvent.type, new ChangedPrVisibilityEvent(+pr, shas, makePublic))).
then(() => true);
}).
catch(err => {
if (!(err instanceof PreviewServerError)) {
err = new PreviewServerError(500, `Error while making PR ${pr} ${makePublic ? 'public' : 'hidden'}.\n${err}`);
}
throw err;
});
}
// Methods - Protected
protected exists(fileOrDir: string): Promise<boolean> {
return new Promise(resolve => fs.access(fileOrDir, err => resolve(!err)));
}
protected extractArchive(inputFile: string, outputDir: string): Promise<void> {
return new Promise<void>((resolve, reject) => {
const cmd = `tar --extract --gzip --directory "${outputDir}" --file "${inputFile}"`;
cp.exec(cmd, (err, _stdout, stderr) => {
if (err) {
return reject(err);
}
if (stderr) {
this.logger.warn(stderr);
}
try {
shell.chmod('-R', 'a-w', outputDir);
shell.rm('-f', inputFile);
resolve();
} catch (err) {
reject(err);
}
});
});
}
protected getCandidatePrDirs(pr: number, isPublic: boolean): {oldPrDir: string, newPrDir: string} {
const hiddenPrDir = path.join(this.buildsDir, HIDDEN_DIR_PREFIX + pr);
const publicPrDir = path.join(this.buildsDir, `${pr}`);
const oldPrDir = isPublic ? hiddenPrDir : publicPrDir;
const newPrDir = isPublic ? publicPrDir : hiddenPrDir;
return {oldPrDir, newPrDir};
}
protected listShasByDate(inputDir: string): Promise<string[]> {
return Promise.resolve().
then(() => shell.ls('-l', inputDir) as any as Promise<(fs.Stats & {name: string})[]>).
// Keep directories only.
// (Also, convert to standard Array - ShellJS provides custom `sort()` method for sorting file contents.)
then(items => items.filter(item => item.isDirectory())).
// Sort by modification date.
then(items => items.sort((a, b) => a.mtime.getTime() - b.mtime.getTime())).
// Return directory names.
then(items => items.map(item => item.name));
}
}