go-telegram-bot-example

Important

In this repository I used the library https://github.com/go-telegram-bot-api/telegram-bot-api, however today it is outdated and irrelevant, for this reason I advise using alternative libraries, among which I can confidently recommend https://github.com/go-telegram/bot. I hope I will have free time to update this repository with an up-to-date library and a more correct approach in general.

This repository is an example of the concept of building Telegram (and other) bots, which does not claim to be a standard or an indisputable truth, which provides a simple and readable code divided into separate layers. In particular, a simple concept of working with user scripts has been implemented.

For a complete immersion in the implementation, it is better to view the source code, which is commented in sufficient detail.

Basic concept

An object-oriented approach is proposed: business entities are implemented at the application level, over which any manipulations are possible. The command in this case refers to a specific entity (object) with which it is planned to perform actions (see diagrams below).

Project structure

The code is structured and organized based on the simplified concept of clean architecture.

├── assets
│   ...
├── cmd
│   └── go-telegram-bot-example
│       // configuration file and main.go, no more
├── internal
│   ├── bot
│   │   // application's internal packages directory
│   ├── config
│   │   // application configuration
│   ├── database
│   │   // state store configuration and initialization
│   ├── flow
│   │   // the same example of implementing custom scripts
│   ├── logger
│   │   // logging initialization with necessary parameters
│   ├── messages
│   │   // here are the messages that we broadcast to the user through the bot
│   ├── model
│   │   // all business entities of the application and auxiliary methods for them
│   ├── repository
│   │   // methods of interaction with the state store (at this level, there can also be calls to external APIs, working with the cache, etc.)
│   └── service
│       // all business logic of the application should be implemented here (work with repositories, etc.)
└── migrations
    // migration files

The concept of working with bot commands

In this example, bot commands are perceived as starters of some user scripts and/or flow in general. At the level of command handlers, any preparatory business logic necessary for further work can be implemented.

The concept of working with callbacks

After executing commands, the user interacts with a specific object and execution script. Therefore, we can use callback data to receive and process user actions.

An example of the described flow

model.Flow{
  model.ProfileCommand: model.Usecase{
    "create": model.Chain{
      0: model.Action{
        Handler: svc.Profile.Create,
	Message: profile.Create(),
      },
    },
  },
}

{
   "profile":{
      "create":{
         "0":{
            "handler": HandlerFunc(),
            "message":"Click the button below to create a profile",
            "buttons":[
               {
                  "name":"Create profile",
                  "callback_data":{
                     "cmd_key":"profile",
                     "case":"create",
                     "step":0,
                     "payload":""
                  }
               }
            ]
         }
      }
   }
}

What else?

Open an issue or PR if you have more suggestions, questions or ideas about what to add.