Telego • Go Telegram Bot API

[![Telegram Bot API Version][TelegramVersionBadge]][TelegramLastVersion]

Telego is Telegram Bot API library for Golang with full [API][TelegramBotAPI] implementation (one-to-one)

all documentation from Telegram.

:warning: Telego is still in v0.x.x version, so do expect breaking changes! :warning:

For more detailed documentation, see docs at telego.pixelbox.dev.

Note: Telego uses fasthttp instead of net/http and go-json instead of encoding/json by default (both can be changed).

:zap: Getting Started

How to get the library:

go get github.com/mymmrac/telego

Make sure you get the latest version to have all new features & fixes.

More examples can be seen here:

Click to show • hide

- [Basic](examples/basic/main.go) - [Configuration](examples/configuration/main.go) - [Methods](examples/methods/main.go) - [Updates (long polling)](examples/updates_long_polling/main.go) - [Updates (webhook)](examples/updates_webhook/main.go) - [Ngrok webhook](examples/ngrok/main.go) - [Echo bot](examples/echo_bot/main.go) - [Echo bot (with handlers)](examples/echo_bot_with_handlers/main.go) - [Echo bot (handlers + webhook + graceful shutdown + docker)](https://github.com/mymmrac/echo-bot) - [Sending files (documents, photos, media groups)](examples/sending_files/main.go) - [Downloading files](examples/download_file/main.go) - [Inline keyboard](examples/inline_keyboard/main.go) - [Keyboard](examples/keyboard/main.go) - [Edit message](examples/edit_message/main.go) - [Utility methods](examples/utility_methods/main.go) - [Inline query bot](examples/inline_query_bot/main.go) - [Bot handlers](examples/handler/main.go) - [Bot handles (groups + middleware)](examples/handler_groups_and_middleware/main.go) - [Update's context](examples/handler_with_context/main.go) - [Graceful shutdown (no helpers)](examples/graceful_shutdown_no_helpers/main.go) - [Graceful shutdown (long polling)](examples/graceful_shutdown_long_polling/main.go) - [Graceful shutdown (webhook)](examples/graceful_shutdown_webhook/main.go) - [Custom predicates for handlers](examples/handler_custom/main.go) - [Handler ordering](examples/handler_ordering/main.go) - [Specific handlers](examples/handler_specific/main.go) - [Predicate as middleware](examples/middleware_with_predicates/main.go) - [Update processor](examples/update_processor/main.go) - [Message entities](examples/message_entity/main.go) - [Multi bot webhook](examples/multi_bot_webhook/main.go) - [Retry caller](examples/retry_caller/main.go) - [Menu bot](examples/menu_bot/main.go) - [Test server](examples/test_server/main.go)

Note: Error handling may be missing in examples, but I strongly recommend handling all errors.

Generally, useful information about Telegram Bots and their features:

Click to show • hide

- [:page_facing_up: Telegram Bot API](https://core.telegram.org/bots/api) • Telegram documentation of Bot API (full reference) - [:jigsaw: Telegram Bot Fundamentals](https://core.telegram.org/bots) • Bots: An introduction for developers - [:star2: Telegram Bot Features](https://core.telegram.org/bots/features) • Describes individual bot elements and features in detail - [:headphones: Telegram Bot Webhooks](https://core.telegram.org/bots/webhooks) • Marvin's Marvellous Guide to All Things Webhook - [:moneybag: Telegram Bot Payments](https://core.telegram.org/bots/payments) • Describes payment system and payment lifecycle - [:iphone: Telegram Bot WebApps](https://core.telegram.org/bots/webapps) • Describes WebApps and interactions with them - [:link: Ngrok](https://ngrok.com) • Connect localhost to the Internet - [:shield: Let's Encrypt](https://letsencrypt.org) • TLS certificates for free

:jigsaw: Basic setup

▲ Go Up ▲

For start, you need to create an instance of your bot and specify token.

package main

import (
	"fmt"
	"os"

	"github.com/mymmrac/telego"
)

func main() {
	// Get Bot token from environment variables
	botToken := os.Getenv("TOKEN")

	// Create bot and enable debugging info
	// Note: Please keep in mind that default logger may expose sensitive information,
	// use in development only
	// (more on configuration in examples/configuration/main.go)
	bot, err := telego.NewBot(botToken, telego.WithDefaultDebugLogger())
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Call method getMe (https://core.telegram.org/bots/api#getme)
	botUser, err := bot.GetMe()
	if err != nil {
		fmt.Println("Error:", err)
	}

	// Print Bot information
	fmt.Printf("Bot user: %+v\n", botUser)
}

:envelope_with_arrow: Getting updates

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In order to receive updates, you can use one of two methods:

• using long polling (bot.UpdatesViaLongPolling)
• using webhook (bot.UpdatesViaWebhook)

Let’s start from long polling (easier for local testing):

package main

import (
	"fmt"
	"os"

	"github.com/mymmrac/telego"
)

func main() {
	botToken := os.Getenv("TOKEN")

	// Note: Please keep in mind that default logger may expose sensitive information,
	// use in development only
	bot, err := telego.NewBot(botToken, telego.WithDefaultDebugLogger())
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Get updates channel
	// (more on configuration in examples/updates_long_polling/main.go)
	updates, _ := bot.UpdatesViaLongPolling(nil)

	// Stop reviving updates from update channel
	defer bot.StopLongPolling()

	// Loop through all updates when they came
	for update := range updates {
		fmt.Printf("Update: %+v\n", update)
	}
}

Webhook example (recommended way):

package main

import (
	"fmt"
	"os"

	"github.com/mymmrac/telego"
)

func main() {
	botToken := os.Getenv("TOKEN")

	// Note: Please keep in mind that default logger may expose sensitive information,
	// use in development only
	bot, err := telego.NewBot(botToken, telego.WithDefaultDebugLogger())
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Set up a webhook on Telegram side
	_ = bot.SetWebhook(&telego.SetWebhookParams{
		URL: "https://example.com/bot" + bot.Token(),
	})

	// Receive information about webhook
	info, _ := bot.GetWebhookInfo()
	fmt.Printf("Webhook Info: %+v\n", info)

	// Get an update channel from webhook.
	// (more on configuration in examples/updates_webhook/main.go)
	updates, _ := bot.UpdatesViaWebhook("/bot" + bot.Token())

	// Start server for receiving requests from the Telegram
	go func() {
		_ = bot.StartWebhook("localhost:443")
	}()

	// Stop reviving updates from update channel and shutdown webhook server
	defer func() {
		_ = bot.StopWebhook()
	}()

	// Loop through all updates when they came
	for update := range updates {
		fmt.Printf("Update: %+v\n", update)
	}
}

For running multiple bots from a single server, see this example.

Tip: For testing webhooks, you can use Ngrok to make a tunnel to your localhost, and get a random domain available from the Internet. It’s as simple as ngrok http 8080. Or follow Telego + Ngrok example using ngrok/ngrok-go for most convenient bot testing.

Tip: You may wish to use Let’s Encrypt in order to generate your free TLS certificate.

:kite: Using Telegram methods

▲ Go Up ▲

All Telegram Bot API methods described in documentation can be used by the library. They have the same names and the same parameters, parameters represented by struct with name: <methodName> + Params. If method doesn’t have required parameters nil value can be used as a parameter.

Note: types.go and methods.go were automatically generated from [documentation][TelegramBotAPI], and it’s possible that they have errors or missing parts both in comments and actual code. Feel free to report such things.

package main

import (
	"fmt"
	"os"

	"github.com/mymmrac/telego"
	tu "github.com/mymmrac/telego/telegoutil"
)

func main() {
	botToken := os.Getenv("TOKEN")

	// Note: Please keep in mind that default logger may expose sensitive information,
	// use in development only
	bot, err := telego.NewBot(botToken, telego.WithDefaultDebugLogger())
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Call method getMe
	botUser, _ := bot.GetMe()
	fmt.Printf("Bot User: %+v\n", botUser)

	updates, _ := bot.UpdatesViaLongPolling(nil)
	defer bot.StopLongPolling()

	for update := range updates {
		if update.Message != nil {
			// Retrieve chat ID
			chatID := update.Message.Chat.ID

			// Call method sendMessage.
			// Send a message to sender with the same text (echo bot).
			// (https://core.telegram.org/bots/api#sendmessage)
			sentMessage, _ := bot.SendMessage(
				tu.Message(
					tu.ID(chatID),
					update.Message.Text,
				),
			)

			fmt.Printf("Sent Message: %v\n", sentMessage)
		}
	}
}

:soap: Utility methods

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In Telego even though you have all types and methods available, it’s often not so convenient to use them directly. To solve this issues telegoutil package was created. It contains utility-helper function that will make your life a bit easier.

I suggest including it with alias to get cleaner code:

import tu "github.com/mymmrac/telego/telegoutil"

The package contains couple methods for creating send parameters with all required parameters like:

• Message(chatID, text) => SendMessageParams
• Photo(chatID, photoFile) => SendPhotoParams
• Location(chatID, latitude, longitude) => SendLocationParams
• …

Or other useful methods like:

• ID(intID) => ChatID
• File(namedReader) => InputFile
• …

Utils related to methods can be found in telegoutil/methods, for types in telegoutil/types, for handlers in telegoutil/handler, for api in telegoutil/api.

Note: If you think that something can be added to telegoutil package fill free to create an issue or pull request with desired changes.

:sun_behind_large_cloud: Bot handlers

▲ Go Up ▲

Processing updates just in for loop is not the most pleasing thing to do, so Telego provides net/http like handlers, but instead of the path, you provide predicates.

One update will only match to the first handler whose predicates are satisfied, predicates checked in order of handler registration (it’s useful to first specify the most specific predicates and then more general).

Also, all handlers (but not their predicates) are processed in parallel.

I suggest including it with alias to get cleaner code:

import th "github.com/mymmrac/telego/telegohandler"

Here is an example of using handlers with long polling updates. You can see the full list of available predicates in telegohandler/predicates, or define your own.

package main

import (
	"fmt"
	"os"

	"github.com/mymmrac/telego"
	th "github.com/mymmrac/telego/telegohandler"
	tu "github.com/mymmrac/telego/telegoutil"
)

func main() {
	botToken := os.Getenv("TOKEN")

	// Note: Please keep in mind that default logger may expose sensitive information,
	// use in development only
	bot, err := telego.NewBot(botToken, telego.WithDefaultDebugLogger())
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	// Get updates channel
	updates, _ := bot.UpdatesViaLongPolling(nil)

	// Create bot handler and specify from where to get updates
	bh, _ := th.NewBotHandler(bot, updates)

	// Stop handling updates
	defer bh.Stop()

	// Stop getting updates
	defer bot.StopLongPolling()

	// Register new handler with match on command `/start`
	bh.Handle(func(bot *telego.Bot, update telego.Update) {
		// Send message
		_, _ = bot.SendMessage(tu.Message(
			tu.ID(update.Message.Chat.ID),
			fmt.Sprintf("Hello %s!", update.Message.From.FirstName),
		))
	}, th.CommandEqual("start"))

	// Register new handler with match on any command
	// Handlers will match only once and in order of registration, 
	// so this handler will be called on any command except `/start` command
	bh.Handle(func(bot *telego.Bot, update telego.Update) {
		// Send message
		_, _ = bot.SendMessage(tu.Message(
			tu.ID(update.Message.Chat.ID),
			"Unknown command, use /start",
		))
	}, th.AnyCommand())

	// Start handling updates
	bh.Start()
}

Also, just handling updates is useful, but handling specific updates like messages or callback queries in most of the cases are more straightforward and provides cleaner code.

So Telego provides specific handles for all fields of telego.Update. See the list of all available handler types in telegohandler/update_handlers, or define your own.

package main

import (
	"fmt"

	"github.com/mymmrac/telego"
	th "github.com/mymmrac/telego/telegohandler"
	tu "github.com/mymmrac/telego/telegoutil"
)

func main() {
	// ... initializing bot and bot handler 
	// (full example in examples/handler_specific/main.go)

	// Register new handler with match on command `/start`
	bh.HandleMessage(func(bot *telego.Bot, message telego.Message) {
		// Send a message with inline keyboard
		_, _ = bot.SendMessage(tu.Message(
			tu.ID(message.Chat.ID),
			fmt.Sprintf("Hello %s!", message.From.FirstName),
		).WithReplyMarkup(tu.InlineKeyboard(
			tu.InlineKeyboardRow(
				tu.InlineKeyboardButton("Go!").WithCallbackData("go"),
			)),
		))
	}, th.CommandEqual("start"))

	// Register new handler with match on the call back query 
	// with data equal to `go` and non-nil message
	bh.HandleCallbackQuery(func(bot *telego.Bot, query telego.CallbackQuery) {
		// Send message
		_, _ = bot.SendMessage(tu.Message(tu.ID(query.Message.Chat.ID), "GO GO GO"))

		// Answer callback query
		_ = bot.AnswerCallbackQuery(tu.CallbackQuery(query.ID).WithText("Done"))
	}, th.AnyCallbackQueryWithMessage(), th.CallbackDataEqual("go"))

	// ... start bot handler
}

One more important part of handlers are groups and middlewares. Telego allows creating groups with and without predicates and attaching middleware to groups.

package main

import (
	"fmt"

	"github.com/mymmrac/telego"
	th "github.com/mymmrac/telego/telegohandler"
)

func main() {
	// Init ...

	// Add global middleware, it will be applied in order of addition
	bh.Use(func(bot *telego.Bot, update telego.Update, next th.Handler) {
		fmt.Println("Global middleware") // Will be called first
		next(bot, update)
	})

	// Create any groups with or without predicates
	// Note: Updates first checked by groups and only then by handlers 
	// (group -> ... -> group -> handler)
	task := bh.Group(th.TextContains("task"))

	// Add middleware to groups
	task.Use(func(bot *telego.Bot, update telego.Update, next th.Handler) {
		fmt.Println("Group-based middleware") // Will be called second

		if len(update.Message.Text) < 10 {
			next(bot, update)
		}
	})

	// Handle updates on a group
	task.HandleMessage(func(bot *telego.Bot, message telego.Message) {
		fmt.Println("Task...") // Will be called third
	})
}

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