Question

网络服务器：nginx
PHP框架：Laravel 5.5
要生成PDF的库：puppeteer

所以我想要做的是，当用户点击下载按钮时，服务器将执行以下操作：

构建包含内容的HTML文件
运行以下代码

Laravel控制器

$shell_output = shell_exec('`which node` ' . base_path('bin/export.js') . ' ' . $html_file . ' ' . $pdf_file . ' A4');
print($shell_output); // <------- empty output

$workable_output = shell_exec('echo `which node`');
print($shell_output); // <------- THIS IS SHOWING "/usr/local/bin/node"

export.js 内容

const puppeteer = require('puppeteer');

var filename = process.argv[2];
var output = process.argv[3];

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.setViewport({ width: 1000, height: 1415 });
  await page.goto('file://' + filename, { waitUntil: 'networkidle2' });
  await page.emulateMedia('print');
  await page.pdf({
    path: output,
    format: 'A4',
    printBackground: true,
    landscape: false,
    margin: {
      top: '60px',
      right: '20px',
      bottom: '30px',
      left: '20px'
    }
  });

  await browser.close();
})();

但问题是，没有生成PDF文件，$shell_output也是空的。

然后我尝试在终端运行shell命令，它运行正常。即。

$ `which node` export.js content.html content.pdf A4

同样，我尝试创建一个php文件，并使用php-cli运行，即

$ php test.php

test.php 的内容如下

<?php
$shell_output = shell_exec('env DEBUG="puppeteer:*" `which node` export.js content.html content.pdf A4');
echo $shell_output;

服务器日志

/var/log/nginx/error.log

2018/03/13 10:37:05 [error] 13017#13017: send() failed (111: Connection refused) while resolving, resolver: 127.0.0.1:53

P / S：我在AWS EC2中托管。在本地计算机上运行时没有问题。

更新于2018-03-14 14:55 PM（UTC + 8）

我试图将代码放在Laravel

./测试/单位/ ExampleTest.php

$shell_output = shell_exec('`which node` ' . base_path('bin/export.js') . ' ' . $html_file . ' ' . $pdf_file . ' A4');

使用 ubuntu 用户运行，它可以正常运行

ubuntu@ip-xxx-xx-xx-xx:/var/www/project$ ./vendor/phpunit/phpunit/phpunit --filter ExampleTest
PHPUnit 6.3.0 by Sebastian Bergmann and contributors.

.
.                                                                  2 / 2 (100%)

Time: 4.82 seconds, Memory: 14.00MB

但是，当我尝试使用 www-data 用户运行时，它失败了

ubuntu@ip-xxx-xx-xx-xx:/var/www/project$ sudo -u www-data ./vendor/phpunit/phpunit/phpunit --filter ExampleTest
PHPUnit 6.3.0 by Sebastian Bergmann and contributors.

.(node:7991) UnhandledPromiseRejectionWarning: Error: spawn EACCES
    at ChildProcess.spawn (internal/child_process.js:330:11)
    at Object.exports.spawn (child_process.js:500:9)
    at Function.launch (/var/www/project/node_modules/puppeteer/lib/Launcher.js:106:40)
    at <anonymous>
(node:7991) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:7991) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
.                                                                  2 / 2 (100%)

Time: 276 ms, Memory: 14.00MB

OK (2 tests, 2 assertions)

知道问题在哪里？

Answer 1

我发现了问题，它是由chrome可执行文件本身

引起的

解决方案

$ chmod 777 /var/www/project/node_modules/puppeteer/.local-chromium/linux-536395/chrome-linux/*

从GitHub issue找到了这个。

php shell_exec无法与puppeteer

服务器日志

更新于2018-03-14 14:55 PM（UTC + 8）

1 个答案: