Codec.hs

{-# LANGUAGE OverloadedRecordDot #-}
-- @generated by keiro-dsl; do not edit. Regenerated from the .keiro spec.
module SkelAggregate.Generated.MyService.Thing.Codec (
    thingCodec,
    parseThingEvent,
    encodeThingEvent,
) where

import SkelAggregate.Generated.MyService.Thing.Domain
import SkelAggregate.Generated.MyService.Nominals (ThingId (..), thingIdText)
import Data.Aeson (Value, object, withObject, (.:), (.=))
import Data.Aeson.Types (Parser, parseEither)
import Data.List.NonEmpty (NonEmpty (..))
import Data.Text (Text)
import qualified Data.Text as T
import Keiro.Codec (Codec (..), EventType (..))





thingCodec :: Codec ThingEvent
thingCodec =
  Codec
    { eventTypes = EventType "ThingCompleted" :| []
    , eventType = \case
        ThingCompleted{} -> EventType "ThingCompleted"
    , schemaVersion = 1
    , encode = encodeThingEvent
    , decode = parseThingEvent
    , upcasters = []
    }

encodeThingEvent :: ThingEvent -> Value
encodeThingEvent = \case
  ThingCompleted payload ->
    object
      [ "kind" .= ("ThingCompleted" :: Text)
      , "thingId" .= thingIdText payload.thingId
      , "attempt" .= payload.attempt
      ]

parseThingEvent :: EventType -> Value -> Either Text ThingEvent
parseThingEvent (EventType tag) = mapLeftText . parseEither (withObject "ThingEvent" go)
  where
    go o = do
      case tag of
        "ThingCompleted" ->
          ThingCompleted <$> (ThingCompletedData <$> (ThingId <$> o .: "thingId") <*> o .: "attempt")
        _ -> fail "unknown event type"

mapLeftText :: Either String b -> Either Text b
mapLeftText = either (Left . T.pack) Right