Puppeteer 集群示例抛出错误：无法获取浏览器页面

Question

我在puppeteer-cluster文档中使用这个示例

我在节点 v10.15.3 上运行它，我尝试将 headless 属性和 SlowMo 传递给 puppeteer 选项。

我希望代码能够注销并创建页面的屏幕截图，但是，发生的情况是几个 chrome 实例启动，它们不加载任何页面，然后控制台挂起并出现错误：

(node:30826) UnhandledPromiseRejectionWarning: Error: Unable to get browser page
    at Worker.<anonymous> (/Users/Starlord/Code/oppose/node_modules/puppeteer-cluster/dist/Worker.js:43:31)
    at Generator.next (<anonymous>)
    at fulfilled (/Users/Starlord/Code/oppose/node_modules/puppeteer-cluster/dist/Worker.js:4:58)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:30826) 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: 21)
(node:30826) [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.
(node:30826) UnhandledPromiseRejectionWarning: Error: Unable to get browser page
    at Worker.<anonymous> (/Users/Starlord/Code/oppose/node_modules/puppeteer-cluster/dist/Worker.js:43:31)
    at Generator.next (<anonymous>)
    at fulfilled (/Users/Starlord/Code/oppose/node_modules/puppeteer-cluster/dist/Worker.js:4:58)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:30826) 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: 22)
^Cinternal/process/per_thread.js:198
      throw errnoException(err, 'kill');
      ^

Error: kill ESRCH
    at process.kill (internal/process/per_thread.js:198:13)
    at process.killChrome (/Users/Starlord/Code/oppose/node_modules/puppeteer/lib/Launcher.js:110:17)
    at process.emit (events.js:189:13)

Answer 1

当库无法创建新的浏览器页面时，会发生此错误。多次尝试打开新的上下文/页面/浏览器（取决于您的设置）后，会在此处引发错误。

调试日志

要获取有关导致错误的原因的更多信息，您可以检查调试日志。这将在调试模式下启动应用程序并将记录更多信息。要进入调试模式，您需要使用环境变量启动应用程序DEBUG='puppeteer-cluster:*'：

# Linux
DEBUG='puppeteer-cluster:*' node application.js
# Windows Powershell
$env:DEBUG='puppeteer-cluster:*';node application.js

问题

在您的情况下，调试日志显示（从上面的评论复制）：

puppeteer-cluster：工作人员获取浏览器页面时出错（尝试：9），消息：this.browser.createIncognitoBrowserContext 不是函数 +660ms

这意味着，createIncognitoBrowserContext库无法用来创建新的上下文。正如您已经确认的那样，情况确实如此，因为您使用的是旧的木偶操作者安装。要使用该设置{ concurrency: Cluster.CONCURRENCY_CONTEXT }，您必须至少使用1.5.0 版本，因为这是引入上下文时的版本。

使固定

要解决此问题，请更新您的 puppeteer 安装：

npm install puppeteer@latest