如何测试cron与Magento？ [英] How would test cron with Magento?

问题描述

首先，我需要了解Magento cron如何工作。

我知道cron如何在linux上运行，使用 crontab -e 。

我知道我需要设置Magento的cron.php来定期运行

但是当我在magento配置文件中定义cron时，

因为如果设置我的cron.php每15分钟运行一次（ 0,15,30， 45 * * * * ）和我有一个Magento cron < schedule>< cron_expr> 10 * * * *< / cron_expr>< / schedule> code>

顺便说一下，如何匹配/工作？

解决方案

Magento的cron入口点是 cron.php 脚本在您的Magento根。

cron的工作原理

p>

每当 cron.php 脚本命中时，会发生以下三种情况：



• 计划：Magento解析合并的 config.xml 文件 config>< crontab> ...< / crontab>< / config> jobs cron_expr 元素，以详细说明应该运行它们的频率。 Magento然后用应该在将来执行的作业填充cron计划表，以及它们应该何时运行的时间戳。


• 执行：Magento读取cron schedule表，以查找需要执行的作业第二和应该已经执行的作业，即具有过去的时间戳，尚未过期。过期限制也是在admin中可配置的参数。


• 清理：Magento通过计划表删除已完成或错过的作业


p>你提出一个有趣的点。如果你有一个10分钟cron计划在Magento会发生什么，但 cron.php 只保证每15分钟打一次。在某些情况下，Magento似乎会执行两次Magento工作：





• HH：00 - > HH ：50和HH：00


• HH：15 - > HH：10


• / em> - > HH：20 and HH：30


• HH：45 - > HH：40






我只读了代码，这就是发生的事情。找到的最好的方法是，当然，运行它，找出来。如果你想避免这个问题，在大多数情况下，然后增加 cron.php 执行频率每5分钟，这是我们做的。





测试您的代码





如果您想测试cron是否在等待年龄，设置 cron_expr 每分钟执行一次，或者清除cron调度表，然后按 cron.php 两次生成日程表，然后再次运行作业）。





如果只想测试模型是否正常工作，可以设置一个测试脚本href =https://www.nicksays.co.uk/testing-magento-modules =nofollow> https://www.nicksays.co.uk/testing-magento-modules ），并运行它。





您的问题提示了一个博文： https://www.nicksays.co.uk/dissecting-the-magento-cron-system ：）




First I need to understand how Magento cron works.

I know how cron works on linux, using crontab -e.
I know I need to set up Magento's cron.php to run periodically

But when I define cron within magento config file, how does they match that they should be run?

Because if set my cron.php to run every 15 min (0,15,30,45 * * * *) and I have a Magento cron <schedule><cron_expr>10 * * * *</cron_expr></schedule> for example.

How will it match/work?

By the way, how could I test that my cron works without waiting a long time?

解决方案

Magento's cron entry point is the cron.php script in your Magento root. You'll need to setup an OS crontab entry hit this script, which you appear to have done already.

How the cron works

Every time the cron.php script is hit three things happen:

• Schedule: Magento parses the merged config.xml files for <config><crontab>...</crontab></config> jobs entries, reading their cron_expr elements for detail on how often they should be run. Magento then populates the cron schedule table with jobs that should be executed in the future, along with timestamps for when they should be run. The extent into the future that Magento does this is configurable in the admin.
• Execute: Magento reads the cron schedule table for jobs that need to be executed this very second and jobs that should have already been executed, i.e. with timestamps in the past, that haven't expired. The expiry limit is also a parameter configurable in the admin.
• Cleanup: Magento goes through the schedule table deleting jobs that have been completed, or missed (due to the deadline).

Duplicate runs?

You raise an interesting point. What happens if you have a 10 minute cron scheduled in Magento, but cron.php is only guaranteed to be hit every 15 minutes. It appears that Magento would run your Magento jobs twice, in some cases:

• HH:00 -> HH:50 and HH:00
• HH:15 -> HH:10
• HH:30 -> HH:20 and HH:30
• HH:45 -> HH:40

I've only read the code, and that's what appears to happen. The best way to find out would be, of course, to run it and find out. If you want to avoid the issue, in most cases, then increase the cron.php execution frequency to every 5 minutes, which is what we do.

Testing your code

If you want to test if your cron is actually working without waiting an age, set the cron_expr to execute every minute, or clear out your cron schedule table then hit cron.php twice (once to generate the schedule, and again to run the job).

If you want to just test that your model is working, you could setup a test script (outlined in https://www.nicksays.co.uk/testing-magento-modules), and run that.

Your question prompted a blog post: https://www.nicksays.co.uk/dissecting-the-magento-cron-system :)

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