browserless hooks 简单说明

browserless提供了hooks 能力，默认实现都为空，以下简单说明下内部处理

默认实现

如下图

内部处理

• hooks.ts 定义

import {

  AfterResponse,

  BeforeRequest,

  BrowserHook,

  PageHook,

} from '@browserless.io/browserless';

import { EventEmitter } from 'events';

 

// KEPT for backwards compatibility reasons since some downstream

// docker images will override these files to inject their own hook

// behaviors

// @ts-ignore

import { default as afterRequest } from '../external/after.js';

// @ts-ignore

import { default as beforeRequest } from '../external/before.js';

// @ts-ignore

import { default as browserHook } from '../external/browser.js';

// @ts-ignore

import { default as pageHook } from '../external/page.js';

 

export class Hooks extends EventEmitter {

  before(args: BeforeRequest): Promise<boolean> {

    return beforeRequest(args);

  }

 

  after(args: AfterResponse): Promise<unknown> {

    return afterRequest(args);

  }

 

  page(args: PageHook): Promise<unknown> {

    return pageHook(args);

  }

 

  browser(args: BrowserHook): Promise<unknown> {

    return browserHook(args);

  }

 

  /**

   * Implement any browserless-core-specific shutdown logic here.

   * Calls the empty-SDK stop method for downstream implementations.

   */

  public shutdown = async () => {

    await this.stop();

  };

 

  /**

   * Left blank for downstream SDK modules to optionally implement.

   */

  public stop = () => {};

}

• 使用

如下图，可以看到不少地方都有使用到，核心就是对于几个hooks 的调用

说明

默认hooks 是放在external 文件夹中的几个文件，如果我们希望自己扩展，就可以重写几个实现，对于基于docker 部署的，直接进行文件替换

参考资料

src/hooks.ts
https://docs.browserless.io/
https://github.com/browserless/browserless