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added server-side change chat username
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104 changes: 104 additions & 0 deletions
104
jvm/src/main/scala/example/modules/services/ChatServiceLive.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| package example.modules.services | ||
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| import cats.implicits._ | ||
| import example.model.ChatData.User | ||
| import example.modules.services.chatService.ChatService | ||
| import example.shared.Dto | ||
| import example.shared.Dto.ChangeChatName | ||
| import example.shared.Dto.ChatMsg | ||
| import example.shared.Dto.ChatUserLeft | ||
| import example.shared.Dto.NewChatUser | ||
| import example.shared.Dto.UnknownData | ||
| import fs2.concurrent.Queue | ||
| import io.scalaland.chimney.dsl._ | ||
| import zio._ | ||
| import zio.logging.Logger | ||
| import zio.logging.LogLevel | ||
|
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| class ChatServiceLive(users: Ref[Vector[User]], idCounter: Ref[Int], logger: Logger) extends ChatService.Service { | ||
| def getUsers(): zio.Task[Dto.ChatUsers] = | ||
| for { | ||
| users <- users.get | ||
| dtoUsers = users.map(_.into[Dto.ChatUser].transform) | ||
| } yield Dto.ChatUsers(dtoUsers.toSet) | ||
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| def createUser(out: Queue[Task[*], Dto.ChatDto]): Task[Dto.ChatUser] = | ||
| for { | ||
| id <- idCounter.modify(id => (id, id + 1)) | ||
| u = User(id = id, name = "unknown", out = out) | ||
| dtoU = u.into[Dto.ChatUser].transform | ||
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| _ <- out.enqueue1(dtoU) | ||
| _ <- handleServerMsg(Dto.NewChatUser(dtoU)) | ||
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| _ <- users.update(_ :+ u) | ||
| dtoUsers <- getUsers() | ||
| _ <- out.enqueue1(dtoUsers) | ||
| } yield dtoU | ||
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| def handleUserMsg(userId: Int, msg: Dto.ClientMsg): Task[Unit] = msg match { | ||
| case chatMsg: ChatMsg => | ||
| for { | ||
| maybeUser <- users.map(_.find(_.id == userId)).get | ||
| _ <- maybeUser | ||
| .fold( | ||
| logError("ChatMsg", s"userId: $userId not found") | ||
| )( | ||
| broadcast(_, userDto => chatMsg.copy(user = userDto)) | ||
| ) | ||
| } yield () | ||
|
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| case cn: ChangeChatName => | ||
| for { | ||
| maybeOldUser <- users.modify(changeUserName(userId, cn.newName, _)) | ||
| _ <- maybeOldUser | ||
| .fold( | ||
| logError("ChangeChatName", s"userId: $userId not found") | ||
| )( | ||
| broadcast(_, userDto => cn.copy(oldUser = userDto)) | ||
| ) | ||
| } yield () | ||
|
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| case ud: UnknownData => | ||
| for { | ||
| users <- users.get | ||
| maybeUser = users.find(_.id == userId) | ||
| _ <- maybeUser.fold(zioUnit)(_.out.enqueue1(ud)) | ||
| } yield () | ||
| } | ||
|
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| def handleServerMsg(msg: Dto.ServerMsg): zio.Task[Unit] = msg match { | ||
| case nu: NewChatUser => | ||
| broadcast(nu) | ||
| case ul @ ChatUserLeft(u) => | ||
| for { | ||
| _ <- users.update(_.filter(_.id != u.id)) | ||
| _ <- broadcast(ul) | ||
| } yield () | ||
| } | ||
|
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| def zioUnit: ZIO[Any, Throwable, Unit] = ZIO.unit // Nothing -> Throwable | ||
| def broadcast(msg: Dto.ChatDto): ZIO[Any, Throwable, Unit] = | ||
| for { | ||
| users <- users.get | ||
| _ <- users.foldLeft(zioUnit)((acc, rcvU) => acc *> rcvU.out.enqueue1(msg)) | ||
| } yield () | ||
|
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| def broadcast(u: User, createMsg: Option[Dto.ChatUser] => Dto.ChatDto): ZIO[Any, Throwable, Unit] = { | ||
| val dtoU = u.into[Dto.ChatUser].transform | ||
| val msgToBroadcast = createMsg(dtoU.some) | ||
| broadcast(msgToBroadcast) | ||
| } | ||
|
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| def changeUserName(userId: Int, newName: String, users: Vector[User]) = { | ||
| import com.softwaremill.quicklens._ | ||
| val uIdPred: User => Boolean = _.id == userId | ||
|
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| val maybeOldUser = users.find(uIdPred) | ||
| val updatedUsers = users.modify(_.eachWhere(uIdPred).name).setTo(newName) | ||
|
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| (maybeOldUser, updatedUsers) | ||
| } | ||
|
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| def logError(caller: String, msg: String): ZIO[Any, Throwable, Unit] = logger.log(LogLevel.Error)(s"$caller -> $msg") | ||
| } |
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