使用带有Node.js的Heroku Scheduler

问题描述

实际上没有关于使用Heroku Scheduler和Node.js的教程。假设我有一个名为 sayHello（）的函数，我希望每10分钟运行一次。我如何在控制器中使用它。在ruby中，你写了 rake function_name（），但是没有对Node做任何解释。我可以写'/ sayHello'或者我应该做额外的配置吗？ 创建文件 code>< project_root> / bin / say_hello ：

 ＃！ / app / bin / node 
 function sayHello（）{
 console.log（'Hello'）; 
} 
 sayHello（）; 
 process.exit（）; 
  

部署到Heroku并使用来测试$ heroku run say_hello 然后将它添加到任务名称为 say_hello 的调度程序中。

解释

say_hello.js 作为您通常使用 $ node say_hello运行的Node.js脚本的示例。 js 。

通过

1. 删除 .js 结尾
   
2. 在顶部插入'shebang'：＃！ / app / bin / node [1] [2]
将

3. 移动到 bin目录下[ 3]

阅读关于。

我同意，除了Ruby脚本以外，其他任何计划任务的Heroku文档都不是很清楚。经过一些试验和错误之后，我设法解决了这个问题。我希望这有助于。

There is literally no tutorial about using Heroku Scheduler with Node.js. Assume that I have a function called sayHello() and I would like to run it every 10 mins. How can I use it in controller. In ruby you write rake function_name() however no explanation made for Node. Can I write '/sayHello' or I should do extra configuration?

解决方案

Create the file <project_root>/bin/say_hello:

#! /app/bin/node
function sayHello() {
  console.log('Hello');
}
sayHello();
process.exit();

Deploy to Heroku and test it with $ heroku run say_hello then add it to the scheduler with task name say_hello.

Explanation

Take say_hello.js as an example of a Node.js script that you would normally run using $ node say_hello.js.

Turn it into a script by

1. removing the .js ending
2. inserting the 'shebang' at the top: #! /app/bin/node [1][2]
3. moving it into the bin directory [3]

[1] Read about the shebang on Wikipedia.
[2] The node executable is installed in app/bin/node on Heroku. You can check it out by logging into bash on Heroku with $ heroku run bash then asking $ which node.
[3] Heroku requires scripts to be placed in the bin directory. See Defining Tasks in the Heroku Dev Center.

I agree that the Heroku documentation for scheduling tasks is not very clear for anything other than Ruby scripts. I managed to work it out after some trial and error. I hope this helps.

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