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runService function and error handling small refactor #33

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Apr 22, 2020
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runService function and error handling small refactor #33

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25 changes: 13 additions & 12 deletions ...main/scala/$package$/api/graphql/$if(add_caliban_endpoint.truthy)$GraphQLApi.scala$endif$
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Original file line number Diff line number Diff line change
Expand Up @@ -47,34 +47,35 @@ object GraphQLApi extends GenericSchema[Any] {
item: ItemId => Task[Option[Item]]
)

def adaptError(e: DomainError): Throwable = e match {
case RepositoryError(cause) => cause
case ValidationError(msg) => new Exception(msg)
}

case class Mutations(
addItem: ItemInput => Task[ItemId],
deleteItem: ItemId => Task[Unit])

def api(repository: ItemRepository): GraphQL[Console with Clock] =
def api(repository: ItemRepository): GraphQL[Console with Clock] = {

def runService[A](f: ZIO[ItemRepository, DomainError, A]): Task[A] =
f.provide(repository).mapError(_.asThrowable)

graphQL(
RootResolver(
Queries(
args => ApplicationService.getItemByName(args.name).mapError(adaptError).provide(repository),
args => ApplicationService.getItemsCheaperThan(args.price).mapError(adaptError).provide(repository),
ApplicationService.getItems.mapError(adaptError).provide(repository),
id => ApplicationService.getItem(id).mapError(adaptError).provide(repository)
args => runService(ApplicationService.getItemByName(args.name)),
args => runService(ApplicationService.getItemsCheaperThan(args.price)),
runService(ApplicationService.getItems),
id => runService(ApplicationService.getItem(id))
),
Mutations(
item => ApplicationService.addItem(item.name, item.price).mapError(_.asThrowable).provide(repository),
id => ApplicationService.deleteItem(id).mapError(e => new Throwable(""))).provide(repository)
item => runService(ApplicationService.addItem(item.name, item.price)),
id => runService(ApplicationService.deleteItem(id))
)
)
) @@
maxFields(200) @@ // query analyzer that limit query fields
maxDepth(30) @@ // query analyzer that limit query depth
timeout(3 seconds) @@ // wrapper that fails slow queries
printSlowQueries(500 millis) @@ // wrapper that logs slow queries
apolloTracing // wrapper for https://github.com/apollographql/apollo-tracing
}

val live: ZLayer[ItemRepository with Has[ActorSystem], CalibanError.ValidationError, GraphQLApi] =
ZLayer.fromFunctionM { env =>
Expand Down