我几乎肯定会以错误的方式解决这个问题,所以首先提出我的高级要求。
我正在使用angular2-seed并希望使用 Xvfb 在无头模式下运行 Protractor 测试。我不想让 Xvfb 服务器一直运行(这是一个构建服务器),所以我想启动一个 Xvfb 服务,让 Protractor 完成它,然后“优雅地”关闭 Xvfb。单独来看,这些任务运行良好,但是在将它们添加到 gulp 构建设置中时我遇到了困难。
这是 gulpfile 中的任务:
gulp.task('e2e.headless', (done: any) =>
runSequence('start.xvfb',
'protractor',
'stop.xvfb',
done));
任务本身是通过单独的打字稿任务文件加载的,即:
import {runProtractor} from '../../utils';
export = runProtractor
这是我的(最新的)实用程序文件本身。
量角器.ts
import * as util from 'gulp-util';
import {normalize, join} from 'path';
import {ChildProcess} from 'child_process';
function reportError(message: string) {
console.error(require('chalk').white.bgRed.bold(message));
process.exit(1);
}
function promiseFromChildProcess(child: ChildProcess) {
return new Promise(function (resolve: () => void, reject: () => void) {
child.on('close', (code: any) => {
util.log('Exited with code: ', code);
resolve();
});
child.stdout.on('data', (data: any) => {
util.log(`stdout: ${data}`);
});
child.stderr.on('data', (data: any) => {
util.log(`stderr: ${data}`);
reject();
});
});
}
export function runProtractor(): (done: () => void) => void {
return done => {
const root = normalize(join(__dirname, '..', '..', '..'));
const exec = require('child_process').exec;
// Our Xvfb instance is running on :99
// TODO: Pass this in instead of hard-coding
process.env.DISPLAY=':99';
util.log('cwd:', root);
let child = exec('protractor', { cwd: root, env: process.env},
function (error: Error, stdout: NodeBuffer, stderr: NodeBuffer) {
if (error !== null) {
reportError('Protractor error: ' + error + stderr);
}
});
promiseFromChildProcess(child).then(() => done());
};
}
xvfb_tools.ts
import * as util from 'gulp-util';
const exec = require('child_process').exec;
function reportError(message: string) {
console.error(require('chalk').white.bgRed.bold(message));
process.exit(1);
}
export function stopXvfb() {
return exec('pkill -c -n Xvfb',
function (error: NodeJS.ErrnoException, stdout: NodeBuffer, stderr: NodeBuffer) {
if (error !== null) {
reportError('Failed to kill Xvfb. Not really sure why...');
} else if (stdout.toString() === '0') {
reportError('No known Xvfb instance. Is it running?');
} else {
util.log('Xvfb terminated');
}
});
}
export function startXvfb() {
return exec('Xvfb :99 -ac -screen 0 1600x1200x24',
function (error: NodeJS.ErrnoException, stdout: NodeBuffer, stderr: NodeBuffer) {
if (error !== null && error.code !== null) {
reportError('Xvfb failed to start. Err: ' + error.code + ', ' + error + ', ' + stderr);
}
});
}
我觉得好像我可能会在我的exec
child_process 中创建一个承诺,但是早期的代码交互并没有这样做,所以......请注意应该在runProtractor()
显示根目录时输出的调试日志永远不会被调用,所以我很确定这里有一个异步问题。这是任务的输出:
[00:47:49] Starting 'e2e.headless'...
[00:47:49] Starting 'start.xvfb'...
[00:47:49] Finished 'start.xvfb' after 12 ms
[00:47:49] Starting 'protractor'...
[00:47:49] Finished 'protractor' after 5.74 ms
[00:47:49] Starting 'stop.xvfb'...
[00:47:49] Finished 'stop.xvfb' after 11 ms
[00:47:49] Finished 'e2e.headless' after 38 ms
[00:47:49] Xvfb terminated
有人能把我拉直/把我推向正确的方向吗?