Collection of extensions for Telegramium (a pure functional Telegram Bot API implementation for Scala) that I use to build my bots.
tgbot-utils is currently available for Scala 3.
Whole utils pack:
libraryDependencies += "ru.johnspade" %% "tgbot-utils" % "<latest version in badge>"A specific module:
libraryDependencies += "ru.johnspade" %% "<module name>" % "<latest version in badge>"Represent your callback query data types as an ADT and use csv3s to (de)serialize them to CSV strings.
import ru.johnspade.csv3s.codecs.*
import ru.johnspade.csv3s.codecs.instances.given
import ru.johnspade.csv3s.parser.*
import ru.johnspade.csv3s.printer.CsvPrinter
import ru.johnspade.tgbot.callbackdata.named.*
import ru.johnspade.tgbot.callbackqueries.*
sealed abstract class CallbackData {
import CallbackData.{encoder, csvPrinter}
def toCsv: String = csvPrinter.print(encoder.encode(this))
}
final case class BuyIcecream(flavor: String) extends CallbackData
case object SayHello extends CallbackData
object CallbackData {
given encoder: RowEncoder[CallbackData] = MagnoliaRowEncoder.derived
given decoder: RowDecoder[CallbackData] = MagnoliaRowDecoder.derived
val Separator: Char = ','
private val csvParser = new CsvParser(Separator)
val csvPrinter: CsvPrinter = CsvPrinter.withSeparator(Separator)
def decode(csv: String): Either[DecodeFailure, CallbackData] =
parseRow(csv, csvParser).left
.map(e => ru.johnspade.tgbot.callbackqueries.ParseError(e.toString))
.flatMap(
decoder
.decode(_)
.left
.map { e =>
ru.johnspade.tgbot.callbackqueries.DecodeError(e.getMessage)
}
)
}
val csv = BuyIcecream("vanilla").toCsv
// BuyIceCream,vanilla
val callbackData = CallbackData.decode(csv).getOrElse(sys.error(""))
// BuyIcecream(vanilla)http4s -like DSL to handle callback queries.
import cats.effect.IO
import ru.johnspade.tgbot.callbackqueries.CallbackQueryDsl._
import ru.johnspade.tgbot.callbackqueries.CallbackQueryRoutes
import telegramium.bots.client.Method
val routes = CallbackQueryRoutes.of[CallbackData, Option[Method[_]], IO] {
case BuyIcecream(flavor) in cb =>
IO {
println(s"${cb.from.firstName} have chosen: $flavor")
None
}
}Extract and use context information from callback queries with CallbackQueryContextRoutes:
import cats.effect.IO
import ru.johnspade.tgbot.callbackqueries.CallbackQueryDsl._
import ru.johnspade.tgbot.callbackqueries.CallbackQueryContextRoutes
import telegramium.bots.high.Methods
case class User(id: Int, firstName: String, language: String)
val contextRoutes = CallbackQueryContextRoutes.of[CallbackData, User, Option[Method[_]], IO] {
case SayHello in cb as user =>
IO {
Some(Methods.answerCallbackQuery(cb.id, text = Some(s"Hello, ${user.firstName}")))
}
}We use CallbackQueryContextMiddleware for that:
import cats.data.{Kleisli, OptionT}
import ru.johnspade.tgbot.callbackqueries.{CallbackQueryContextMiddleware, CallbackQueryData, ContextCallbackQuery}
val userMiddleware: CallbackQueryContextMiddleware[CallbackData, User, Option[Method[_]], IO] =
_.compose(
Kleisli { (cb: CallbackQueryData[CallbackData]) =>
val from = cb.cb.from
val user = User(from.id, from.firstName, from.languageCode.getOrElse("en"))
OptionT.liftF(IO(ContextCallbackQuery(user, cb)))
}
)Combine multiple routes with <+> (combineK) and handle queries with CallbackQueryHandler:
import cats.syntax.semigroupk._
import cats.syntax.either._
import ru.johnspade.tgbot.callbackqueries.{CallbackQueryHandler, CallbackDataDecoder, ParseError, DecodeError}
val allRoutes = routes <+> userMiddleware(contextRoutes)
private val cbDataDecoder: CallbackDataDecoder[IO, CallbackData] =
CallbackData.decode(_).left.map {
case error: kantan.csv.ParseError => ParseError(error.getMessage)
case error: kantan.csv.DecodeError => DecodeError(error.getMessage)
}
.toEitherT[IO]
// query: CallbackQuery
val handler = CallbackQueryHandler.handle(
query,
routes = allRoutes,
decoder = cbDataDecoder,
onNotFound = _ => IO(Option.empty[Method[_]])
)REMOVED: It is now a part of Telegramium and has been removed.