phfroidmont/foyer-dsi-assure-2035
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Improve error handling

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Paul-Henri Froidmont 2025-10-22 15:30:36 +02:00
parent 87bd780f9f
commit e6a8150483
Signed by: phfroidmont
GPG key ID: BE948AFD7E7873BE
7 changed files with 78 additions and 62 deletions
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16
core/src/lu/foyer/EventSourcing.scala
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@ -28,13 +28,14 @@ trait CommandHandler[+Command, +Event, +State]:
def commandSchema: Schema[?]
trait CommandHandlerCreate[Command: Schema, Event] extends CommandHandler[Command, Event, Nothing]:
def onCommand(entityId: String, command: Command): Task[Event]
def onCommand(entityId: String, command: Command): IO[JsonApiError | Throwable, Event]
val isCreate = true
val commandSchema = summon[Schema[Command]]
trait CommandHandlerUpdate[Command: Schema, Event, State]
extends CommandHandler[Command, Event, State]:
def onCommand(entityId: String, state: State, command: Command): Task[Event]
def onCommand(entityId: String, state: State, command: Command)
: IO[JsonApiError | Throwable, Event]
val isCreate = false
val commandSchema = summon[Schema[Command]]
@ -45,20 +46,21 @@ class CommandEngine[Command, Event, State](
val stateRepo: StateRepository[State]):
def handleCommand(command: Command, name: String, entityId: String)
: Task[(lu.foyer.Event[Event], lu.foyer.Entity[State])] =
: IO[JsonApiError | Throwable, (lu.foyer.Event[Event], lu.foyer.Entity[State])] =
for
handler <- ZIO
.succeed(handlers.find(_.name == name))
.someOrFail(new IllegalArgumentException(s"No handler found for command $name"))
entityOption <- stateRepo.fetchOne(entityId)
(event, newStateOption) <- transition(command, name, entityId, entityOption, handler)
newState <-
newState <-
ZIO
.succeed(newStateOption)
.someOrFail(new IllegalArgumentException("Reducer cannot resolve state transition"))
newEntity = Entity(entityId, newState, entityOption.map(_.version).getOrElse(1))
_ <- if entityOption.isEmpty then stateRepo.insert(newEntity.entityId, newEntity)
else stateRepo.update(newEntity.entityId, newEntity)
_ <-
if entityOption.isEmpty then stateRepo.insert(newEntity.entityId, newEntity)
else stateRepo.update(newEntity.entityId, newEntity)
eventEntity <- Random.nextUUID.map(id => Event(newEntity.entityId, event, id.toString))
_ <- eventRepo.insert(eventEntity.eventId, eventEntity)
yield (eventEntity, newEntity)
@ -69,7 +71,7 @@ class CommandEngine[Command, Event, State](
entityId: String,
entityOption: Option[Entity[State]],
handler: CommandHandler[Command, Event, State]
): Task[(Event, Option[State])] = (entityOption, handler) match
): IO[JsonApiError | Throwable, (Event, Option[State])] = (entityOption, handler) match
case (None, h) if !h.isUpdate =>
h.asInstanceOf[CommandHandlerCreate[Command, Event]]
.onCommand(entityId, command)