Teach you how to implement a duty robot using Golang and lua

The following column golangtutorial will introduce to you how to use Golang and lua to implement a duty robot. I hope it will be helpful to friends in need!

One of the tasks of our project team is to collect emails (to a large extent, we use emails to save money), and then check them from our system. Check out the relevant information and then reply to the email. Although the workload is not large, it will cut the time into small pieces. In order to save my time, I made an email robot on duty. I asked him to automatically reply to emails on my behalf. Considering that many people should be able to use this thing, I shared it. Let’s share the effect first.

It’s very simple on the server. Dutyrobot is the framework compiled by Golang. The lua folder contains business logic written in lua. Data.json saves some relevant data to prevent data from being lost after restarting, such as cookie information.

Use the most basic alpine to start, map the relevant folders to the container, and then start the software in the container. This is mainly done so that the image can have its own environment variables.

Then the business logic regularly receives emails, then determines the business logic, executes the corresponding lua script, and then replies to the email.

Just push a related result to our internal affairs group.

Actually, I am a C# programmer. To do this, I first used C# to implement it. However, C# and Lua are not compatible, and I have not found a more elegant class library. To use Linux system, I have tried using .net core C to call Lua, but I am still very naive about this matter. I was confused by the installation of various Python packages. So in the end, I chose Golang to write the underlying functions and publish them to Lua, and then let Lua write various business logic to implement the entire project. As for the framework part, once it is written, the probability of changes is relatively low, and cross-compiling Linux with Window can be deployed and launched directly without even installing an environment, which is really cool. The lua interpreted language is pretty good except for nothing.

The basic framework is universal, so it can be released and used directly. Just care about your business content.

Basic framework: https://gitee.com/anxin1225/DutyRobotGo

In this framework, I provide many functions for lua, mainly including sending and receiving emails, initiating network requests, and initiating Network monitoring (you can even use this as the bottom layer to make a small API station, trust me, I have done this before), temporarily save data, obtain environment variables, obtain file contents, and then start a Lua container (yes, lua The ability to create a Lua container again), obtain current system information, and cron scheduled tasks. Of course, if you feel it's not enough, you can also expand it a second time. It's actually very easy. I've already written a lot of it. I'll compare it and copy it. It's very easy. However, in general, there is no need to expand. I will not explain the framework part in depth here. After all, how to do business is the focus.

Then, let’s talk about how the Lua part is implemented. Because the code in Golang directly finds main.lua for execution, we will start from this file.

I have registered many services. As for what services there are, I still have to look at how they are written in the framework. Cron is one of the small functions I wrote. In fact, it is a task task. Corresponding to the framework part, you can check the tasks folder to see the specific implementation. You can see that there are two files on both sides. Among them, task.go is the language function of Golang. task_4lua.go is to expose the function of Golang. The registered location of the interface called by Lua.

Let’s take a look at the file task_4lua.go. There is usually a function called RegisterFunc_4lua for registration.

This looks very familiar. Cron is the name of the class used by Lua. The map below is the corresponding name that needs to be called. The following will be compared with the functions on the golang side. Generally, I will write the Lua side in the function. How should it be called. If you can't find it, you can come to the frame and look around. You might be surprised.

In my business. Just receive it every minute and save the cookie every 5 minutes. The real business logic is actually written in each Lua file. Let's take a look at how to receive and process messages.

Here is the simple business logic of Lua. Receive the email and then call the corresponding processing Lua. Once the processing is completed, you are done.

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