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streams.scala
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streams.scala
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/*
* Copyright 2020 Scala EventStoreDB Client
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package sec
package api
package mapping
import java.util.UUID as JUUID
import java.time.Instant
import java.util.concurrent.TimeoutException
import cats.{Applicative, ApplicativeThrow, MonadThrow}
import cats.data.{NonEmptyList, OptionT}
import cats.syntax.all.*
import com.eventstore.dbclient.proto.shared as pshared
import com.eventstore.dbclient.proto.streams.*
import sec.api.exceptions.*
import sec.api.grpc.constants.Metadata.{ContentType, ContentTypes, Created, Type}
import sec.api.mapping.shared.*
import sec.api.mapping.time.*
private[sec] object streams:
//======================================================================================================================
// Outgoing
//======================================================================================================================
object outgoing:
val empty: pshared.Empty = pshared.Empty()
val uuidOption: ReadReq.Options.UUIDOption = ReadReq.Options.UUIDOption().withStructured(empty)
val mapLogPosition: LogPosition => ReadReq.Options.AllOptions.AllOption =
case LogPosition.Exact(c, p) =>
ReadReq.Options.AllOptions.AllOption.Position(ReadReq.Options.Position(c.toLong, p.toLong))
case LogPosition.End => ReadReq.Options.AllOptions.AllOption.End(empty)
val mapLogPositionOpt: Option[LogPosition] => ReadReq.Options.AllOptions.AllOption =
case Some(v) => mapLogPosition(v)
case None => ReadReq.Options.AllOptions.AllOption.Start(empty)
val mapStreamPosition: StreamPosition => ReadReq.Options.StreamOptions.RevisionOption =
case StreamPosition.Exact(nr) => ReadReq.Options.StreamOptions.RevisionOption.Revision(nr.toLong)
case StreamPosition.End => ReadReq.Options.StreamOptions.RevisionOption.End(empty)
val mapStreamPositionOpt: Option[StreamPosition] => ReadReq.Options.StreamOptions.RevisionOption =
case Some(v) => mapStreamPosition(v)
case None => ReadReq.Options.StreamOptions.RevisionOption.Start(empty)
val mapDirection: Direction => ReadReq.Options.ReadDirection =
case Direction.Forwards => ReadReq.Options.ReadDirection.Forwards
case Direction.Backwards => ReadReq.Options.ReadDirection.Backwards
val mapReadEventFilter: Option[SubscriptionFilterOptions] => ReadReq.Options.FilterOption =
import ReadReq.Options.FilterOption
def filter(options: SubscriptionFilterOptions): FilterOption =
val expr = options.filter.option.fold(
nel => ReadReq.Options.FilterOptions.Expression().withPrefix(nel.map(_.value).toList),
reg => ReadReq.Options.FilterOptions.Expression().withRegex(reg.value)
)
val window = options.maxSearchWindow
.map(ReadReq.Options.FilterOptions.Window.Max(_))
.getOrElse(ReadReq.Options.FilterOptions.Window.Count(empty))
val filterOptions = ReadReq.Options
.FilterOptions()
.withWindow(window)
.withCheckpointIntervalMultiplier(options.checkpointIntervalMultiplier)
val result = options.filter.kind match
case EventFilter.ByStreamId => filterOptions.withStreamIdentifier(expr)
case EventFilter.ByEventType => filterOptions.withEventType(expr)
FilterOption.Filter(result)
def noFilter: FilterOption = FilterOption.NoFilter(empty)
_.fold(noFilter)(filter)
def mkSubscribeToStreamReq(
streamId: StreamId,
exclusiveFrom: Option[StreamPosition],
resolveLinkTos: Boolean
): ReadReq =
val options = ReadReq
.Options()
.withStream(ReadReq.Options.StreamOptions(streamId.esSid.some, mapStreamPositionOpt(exclusiveFrom)))
.withSubscription(ReadReq.Options.SubscriptionOptions())
.withReadDirection(mapDirection(Direction.Forwards))
.withResolveLinks(resolveLinkTos)
.withNoFilter(empty)
.withUuidOption(uuidOption)
ReadReq().withOptions(options)
def mkSubscribeToAllReq(
exclusiveFrom: Option[LogPosition],
resolveLinkTos: Boolean,
filterOptions: Option[SubscriptionFilterOptions]
): ReadReq =
val options = ReadReq
.Options()
.withAll(ReadReq.Options.AllOptions(mapLogPositionOpt(exclusiveFrom)))
.withSubscription(ReadReq.Options.SubscriptionOptions())
.withReadDirection(mapDirection(Direction.Forwards))
.withResolveLinks(resolveLinkTos)
.withFilterOption(mapReadEventFilter(filterOptions))
.withUuidOption(uuidOption)
ReadReq().withOptions(options)
def mkReadStreamReq(
streamId: StreamId,
from: StreamPosition,
direction: Direction,
count: Long,
resolveLinkTos: Boolean
): ReadReq =
val options = ReadReq
.Options()
.withStream(ReadReq.Options.StreamOptions(streamId.esSid.some, mapStreamPosition(from)))
.withCount(count)
.withReadDirection(mapDirection(direction))
.withResolveLinks(resolveLinkTos)
.withNoFilter(empty)
.withUuidOption(uuidOption)
.withControlOption(ReadReq.Options.ControlOption(1))
ReadReq().withOptions(options)
def mkReadAllReq(
from: LogPosition,
direction: Direction,
maxCount: Long,
resolveLinkTos: Boolean
): ReadReq =
val options = ReadReq
.Options()
.withAll(ReadReq.Options.AllOptions(mapLogPosition(from)))
.withCount(maxCount)
.withReadDirection(mapDirection(direction))
.withResolveLinks(resolveLinkTos)
.withNoFilter(empty)
.withUuidOption(uuidOption)
.withControlOption(ReadReq.Options.ControlOption(1))
ReadReq().withOptions(options)
def mkDeleteReq(streamId: StreamId, expectedState: StreamState): DeleteReq =
val mapDeleteExpected: StreamState => DeleteReq.Options.ExpectedStreamRevision =
case StreamPosition.Exact(v) => DeleteReq.Options.ExpectedStreamRevision.Revision(v.toLong)
case StreamState.NoStream => DeleteReq.Options.ExpectedStreamRevision.NoStream(empty)
case StreamState.StreamExists => DeleteReq.Options.ExpectedStreamRevision.StreamExists(empty)
case StreamState.Any => DeleteReq.Options.ExpectedStreamRevision.Any(empty)
DeleteReq().withOptions(DeleteReq.Options(streamId.esSid.some, mapDeleteExpected(expectedState)))
def mkTombstoneReq(streamId: StreamId, expectedState: StreamState): TombstoneReq =
val mapTombstoneExpected: StreamState => TombstoneReq.Options.ExpectedStreamRevision =
case StreamPosition.Exact(v) => TombstoneReq.Options.ExpectedStreamRevision.Revision(v.toLong)
case StreamState.NoStream => TombstoneReq.Options.ExpectedStreamRevision.NoStream(empty)
case StreamState.StreamExists => TombstoneReq.Options.ExpectedStreamRevision.StreamExists(empty)
case StreamState.Any => TombstoneReq.Options.ExpectedStreamRevision.Any(empty)
TombstoneReq().withOptions(TombstoneReq.Options(streamId.esSid.some, mapTombstoneExpected(expectedState)))
def mkAppendHeaderReq(streamId: StreamId, expectedState: StreamState): AppendReq =
val mapAppendExpected: StreamState => AppendReq.Options.ExpectedStreamRevision =
case StreamPosition.Exact(v) => AppendReq.Options.ExpectedStreamRevision.Revision(v.toLong)
case StreamState.NoStream => AppendReq.Options.ExpectedStreamRevision.NoStream(empty)
case StreamState.StreamExists => AppendReq.Options.ExpectedStreamRevision.StreamExists(empty)
case StreamState.Any => AppendReq.Options.ExpectedStreamRevision.Any(empty)
AppendReq().withOptions(AppendReq.Options(streamId.esSid.some, mapAppendExpected(expectedState)))
def mkAppendProposalsReq(events: NonEmptyList[EventData]): NonEmptyList[AppendReq] =
events.map { e =>
val id = mkUuid(e.eventId)
val customMeta = e.metadata.toByteString
val data = e.data.toByteString
val ct = e.contentType.fold(ContentTypes.ApplicationOctetStream, ContentTypes.ApplicationJson)
val meta = Map(Type -> EventType.eventTypeToString(e.eventType), ContentType -> ct)
AppendReq().withProposedMessage(AppendReq.ProposedMessage(id.some, meta, customMeta, data))
}
def mkBatchAppendHeader(
streamId: StreamId,
expectedState: StreamState,
deadline: Option[Instant]
): BatchAppendReq.Options =
import com.google.protobuf.timestamp.Timestamp
val empty = com.google.protobuf.empty.Empty()
val mapExpectedStreamPosition: StreamState => BatchAppendReq.Options.ExpectedStreamPosition =
case StreamPosition.Exact(v) => BatchAppendReq.Options.ExpectedStreamPosition.StreamPosition(v.toLong)
case StreamState.NoStream => BatchAppendReq.Options.ExpectedStreamPosition.NoStream(empty)
case StreamState.StreamExists => BatchAppendReq.Options.ExpectedStreamPosition.StreamExists(empty)
case StreamState.Any => BatchAppendReq.Options.ExpectedStreamPosition.Any(empty)
val req = BatchAppendReq
.Options()
.withStreamIdentifier(streamId.esSid)
.withExpectedStreamPosition(mapExpectedStreamPosition(expectedState))
deadline.fold(req)(i => req.withDeadline(Timestamp.of(i.getEpochSecond, i.getNano)))
def mkBatchAppendProposal(e: EventData): BatchAppendReq.ProposedMessage =
val id = mkUuid(e.eventId)
val customMeta = e.metadata.toByteString
val data = e.data.toByteString
val ct = e.contentType.fold(ContentTypes.ApplicationOctetStream, ContentTypes.ApplicationJson)
val meta = Map(Type -> EventType.eventTypeToString(e.eventType), ContentType -> ct)
BatchAppendReq.ProposedMessage(id.some, meta, customMeta, data)
def mkHeaderReq(
correlationId: JUUID,
streamId: StreamId,
expectedState: StreamState,
deadline: Option[Instant]
): BatchAppendReq =
BatchAppendReq()
.withCorrelationId(mkUuid(correlationId))
.withOptions(mkBatchAppendHeader(streamId, expectedState, deadline))
def mkProposalsReq(
correlationId: JUUID,
data: List[BatchAppendReq.ProposedMessage],
isFinal: Boolean
): BatchAppendReq =
BatchAppendReq()
.withCorrelationId(mkUuid(correlationId))
.withProposedMessages(data)
.withIsFinal(isFinal)
end outgoing
//======================================================================================================================
// Incoming
//======================================================================================================================
object incoming:
def mkLogPosition[F[_]: ApplicativeThrow](e: ReadResp.ReadEvent.RecordedEvent): F[LogPosition.Exact] =
LogPosition(e.commitPosition, e.preparePosition).liftTo[F]
def mkStreamPosition[F[_]: Applicative](e: ReadResp.ReadEvent.RecordedEvent): F[StreamPosition.Exact] =
StreamPosition(e.streamRevision).pure[F]
def mkCheckpoint[F[_]: ApplicativeThrow](c: ReadResp.Checkpoint): F[Checkpoint] =
LogPosition(c.commitPosition, c.preparePosition)
.map(Checkpoint(_))
.leftMap(error => ProtoResultError(s"Invalid position for Checkpoint: ${error.msg}"))
.liftTo[F]
def mkCheckpointOrEvent[F[_]: MonadThrow](re: ReadResp): F[Option[Either[Checkpoint, Event]]] =
val event = OptionT(re.content.event.flatTraverse(mkEvent[F]).nested.map(_.asRight[Checkpoint]).value)
val checkpoint = OptionT(re.content.checkpoint.traverse(mkCheckpoint[F]).nested.map(_.asLeft[Event]).value)
(event <+> checkpoint).value
def mkStreamNotFound[F[_]: MonadThrow](snf: ReadResp.StreamNotFound): F[StreamNotFound] =
snf.streamIdentifier.require[F]("StreamIdentifer") >>= (_.utf8[F].map(StreamNotFound(_)))
def failStreamNotFound[F[_]: MonadThrow](rr: ReadResp): F[ReadResp] =
rr.content.streamNotFound.fold(rr.pure[F])(mkStreamNotFound[F](_) >>= (_.raiseError[F, ReadResp]))
def reqReadEvent[F[_]: MonadThrow](rr: ReadResp): F[Option[Event]] =
rr.content.event.require[F]("ReadEvent") >>= (mkEvent[F])
def reqConfirmation[F[_]: ApplicativeThrow](rr: ReadResp): F[SubscriptionConfirmation] =
rr.content.confirmation
.map(_.subscriptionId)
.require[F]("SubscriptionConfirmation", details = s"Got ${rr.content} instead".some)
.map(SubscriptionConfirmation(_))
def mkEvent[F[_]: MonadThrow](re: ReadResp.ReadEvent): F[Option[Event]] =
re.event.traverse(mkEventRecord[F]) >>= { eOpt =>
re.link
.traverse(mkEventRecord[F])
.map(lOpt => eOpt.map(er => lOpt.fold[Event](er)(ResolvedEvent(er, _))))
}
def mkEventRecord[F[_]: MonadThrow](e: ReadResp.ReadEvent.RecordedEvent): F[EventRecord] =
val streamId = mkStreamId[F](e.streamIdentifier)
val position = mkStreamPosition[F](e)
val logPosition = mkLogPosition[F](e)
val data = e.data.toByteVector
val customMeta = e.customMetadata.toByteVector
val eventId = e.id.require[F]("UUID") >>= mkJuuid[F]
val eventType = e.metadata.get(Type).require[F](Type) >>= mkEventType[F]
val contentType = e.metadata.get(ContentType).require[F](ContentType) >>= mkContentType[F]
val created = e.metadata.get(Created).flatMap(_.toLongOption).require[F](Created) >>= fromTicksSinceEpoch[F]
val eventData = (eventType, eventId, contentType).mapN((t, i, ct) => EventData(t, i, data, customMeta, ct))
(streamId, position, logPosition, eventData, created).mapN((id, p, lp, ed, c) =>
sec.EventRecord(id, p, lp, ed, c))
def mkContentType[F[_]](ct: String)(implicit F: ApplicativeThrow[F]): F[ContentType] = ct match
case ContentTypes.ApplicationOctetStream => F.pure(sec.ContentType.Binary)
case ContentTypes.ApplicationJson => F.pure(sec.ContentType.Json)
case unknown => F.raiseError(ProtoResultError(s"Required value $ContentType missing or invalid: $unknown"))
def mkEventType[F[_]: ApplicativeThrow](name: String): F[EventType] =
EventType.stringToEventType(Option(name).getOrElse("")).leftMap(ProtoResultError(_)).liftTo[F]
def mkWriteResult[F[_]: ApplicativeThrow](sid: StreamId, ar: AppendResp): F[WriteResult] =
import AppendResp.{Result, Success}
import AppendResp.WrongExpectedVersion.ExpectedRevisionOption
import AppendResp.WrongExpectedVersion.CurrentRevisionOption
def success(s: Result.Success) =
val logPositionExact: Either[Throwable, LogPosition.Exact] = s.value.positionOption match
case Success.PositionOption.Position(p) => LogPosition.exact(p.commitPosition, p.preparePosition).asRight
case Success.PositionOption.NoPosition(_) => mkError("Did not expect NoPosition when using NonEmptyList")
case Success.PositionOption.Empty => mkError("PositionOption is missing")
val streamPositionExact: Either[Throwable, StreamPosition.Exact] = s.value.currentRevisionOption match
case Success.CurrentRevisionOption.CurrentRevision(v) => StreamPosition(v).asRight
case Success.CurrentRevisionOption.NoStream(_) => mkError("Did not expect NoStream when using NonEmptyList")
case Success.CurrentRevisionOption.Empty => mkError("CurrentRevisionOption is missing")
(streamPositionExact, logPositionExact).mapN((r, p) => WriteResult(r, p))
def wrongExpectedStreamState(w: Result.WrongExpectedVersion) =
val expected: Either[Throwable, StreamState] = w.value.expectedRevisionOption match
case ExpectedRevisionOption.ExpectedRevision(v) => StreamPosition(v).asRight
case ExpectedRevisionOption.ExpectedNoStream(_) => StreamState.NoStream.asRight
case ExpectedRevisionOption.ExpectedAny(_) => StreamState.Any.asRight
case ExpectedRevisionOption.ExpectedStreamExists(_) => StreamState.StreamExists.asRight
case ExpectedRevisionOption.Empty => mkError("ExpectedRevisionOption is missing")
val actual: Either[Throwable, StreamState] = w.value.currentRevisionOption match
case CurrentRevisionOption.CurrentRevision(v) => StreamPosition(v).asRight
case CurrentRevisionOption.CurrentNoStream(_) => StreamState.NoStream.asRight
case CurrentRevisionOption.Empty => mkError("CurrentRevisionOption is missing")
(expected, actual).mapN((e, a) => WrongExpectedState(sid, e, a))
val result: Either[Throwable, WriteResult] = ar.result match
case s: Result.Success => success(s)
case w: Result.WrongExpectedVersion => wrongExpectedStreamState(w) >>= (_.asLeft[WriteResult])
case Result.Empty => mkError("Result is missing")
result.liftTo[F]
def mkBatchWriteResult[F[_]](bar: BatchAppendResp)(implicit F: MonadThrow[F]): F[WriteResult] =
import BatchAppendResp._
import com.google.rpc._
def success(s: Success): Either[Throwable, WriteResult] = {
val logPositionExact: Either[Throwable, LogPosition.Exact] = s.positionOption match {
case Success.PositionOption.Position(p) => LogPosition.exact(p.commitPosition, p.preparePosition).asRight
case Success.PositionOption.NoPosition(_) => mkError("Did not expect NoPosition")
case Success.PositionOption.Empty => mkError("PositionOption is missing")
}
val streamPositionExact: Either[Throwable, StreamPosition.Exact] = s.currentRevisionOption match {
case Success.CurrentRevisionOption.CurrentRevision(v) => StreamPosition(v).asRight
case Success.CurrentRevisionOption.NoStream(_) => mkError("Did not expect NoStream when using NonEmptyList")
case Success.CurrentRevisionOption.Empty => mkError("CurrentRevisionOption is missing")
}
(streamPositionExact, logPositionExact).mapN((r, p) => WriteResult(r, p))
}
def failure(f: Status): F[WriteResult] =
def raise(t: Throwable): F[WriteResult] =
F.raiseError[WriteResult](t)
def mkUnknown(msg: String): UnknownError =
UnknownError(s"code: ${f.code.name} - message: $msg")
def handleWrongExpectedVersion(wev: pshared.WrongExpectedVersion): F[WriteResult] =
mkStreamId[F](bar.streamIdentifier) >>= { mkWrongExpectedStreamState[F](_, wev) >>= raise }
def handleStreamDeleted(sd: pshared.StreamDeleted): F[WriteResult] =
mkStreamDeleted[F](sd) >>= raise
f.details.fold(raise(mkUnknown(f.message))) { v =>
if (v.is[pshared.WrongExpectedVersion])
handleWrongExpectedVersion(v.unpack[pshared.WrongExpectedVersion])
else if (v.is[pshared.StreamDeleted])
handleStreamDeleted(v.unpack[pshared.StreamDeleted])
else if (v.is[pshared.AccessDenied])
raise(AccessDenied)
else if (v.is[pshared.Timeout])
raise(new TimeoutException(s"Timeout - code: ${f.code.name} - message: ${f.message}"))
else if (v.is[pshared.Unknown])
raise(mkUnknown(f.message))
else if (v.is[pshared.InvalidTransaction])
raise(InvalidTransaction)
else if (v.is[pshared.MaximumAppendSizeExceeded])
raise(mkMaximumAppendSizeExceeded(v.unpack[pshared.MaximumAppendSizeExceeded]))
else if (v.is[pshared.BadRequest])
raise(mkUnknown(v.unpack[pshared.BadRequest].message))
else
raise(mkUnknown(f.message))
}
bar.result match
case BatchAppendResp.Result.Success(v) => success(v).liftTo[F]
case BatchAppendResp.Result.Error(value) => failure(value)
case BatchAppendResp.Result.Empty => mkError("Result is missing").liftTo[F]
///
def mkDeleteResult[F[_]: ApplicativeThrow](dr: DeleteResp): F[DeleteResult] =
dr.positionOption.position
.map(p => DeleteResult(LogPosition.exact(p.commitPosition, p.preparePosition)))
.require[F]("DeleteResp.PositionOptions.Position")
def mkTombstoneResult[F[_]: ApplicativeThrow](tr: TombstoneResp): F[TombstoneResult] =
tr.positionOption.position
.map(p => TombstoneResult(LogPosition.exact(p.commitPosition, p.preparePosition)))
.require[F]("TombstoneResp.PositionOptions.Position")
// ====================================================================================================================
def mkStreamMessageNotFound[F[_]: MonadThrow](p: ReadResp.StreamNotFound): F[StreamMessage.NotFound] =
p.streamIdentifier.require[F]("StreamIdentifer") >>= { mkStreamId[F](_).map(StreamMessage.NotFound(_)) }
def mkStreamMessageEvent[F[_]: MonadThrow](p: ReadResp.ReadEvent): F[Option[StreamMessage.StreamEvent]] =
mkEvent[F](p).map(_.map(StreamMessage.StreamEvent(_)))
def mkStreamMessageFirst[F[_]: Applicative](v: Long): F[StreamMessage.FirstStreamPosition] =
StreamMessage.FirstStreamPosition(StreamPosition(v)).pure[F]
def mkStreamMessageLast[F[_]: Applicative](v: Long): F[StreamMessage.LastStreamPosition] =
StreamMessage.LastStreamPosition(StreamPosition(v)).pure[F]
def mkAllMessageEvent[F[_]: MonadThrow](p: ReadResp.ReadEvent): F[Option[AllMessage.AllEvent]] =
mkEvent[F](p).map(_.map(AllMessage.AllEvent(_)))
def mkAllMessageLast[F[_]: ApplicativeThrow](p: pshared.AllStreamPosition): F[AllMessage.LastAllStreamPosition] =
LogPosition(p.commitPosition, p.preparePosition).liftTo[F].map(AllMessage.LastAllStreamPosition(_))
// ======================================================================================================================
sealed trait AllResult
object AllResult:
import ReadResp.Content as c
final case class EventR(event: Option[sec.Event]) extends AllResult
final case class CheckpointR(checkpoint: Checkpoint) extends AllResult
final case class ConfirmationR(confirmation: SubscriptionConfirmation) extends AllResult
final case class LastPositionR(position: LogPosition) extends AllResult
def fromWire[F[_]](p: ReadResp)(implicit F: MonadThrow[F]): F[AllResult] = p.content match
case c.Event(v) => mkEvent[F](v).map(EventR(_))
case c.Checkpoint(v) => mkCheckpoint[F](v).map(CheckpointR(_))
case c.Confirmation(v) => F.pure(ConfirmationR(SubscriptionConfirmation(v.subscriptionId)))
case c.LastAllStreamPosition(v) =>
v.toLogPosition.leftMap(e => ProtoResultError(e.msg)).liftTo[F].map(LastPositionR(_))
case m => F.raiseError(ProtoResultError(s"Unexpected response for AllResult: $m"))
//
extension (ar: AllResult)
def fold[A](
eventFn: EventR => A,
checkpointFn: CheckpointR => A,
confirmationFn: ConfirmationR => A,
lastPositionFn: LastPositionR => A
): A = ar match {
case x: EventR => eventFn(x)
case x: CheckpointR => checkpointFn(x)
case x: ConfirmationR => confirmationFn(x)
case x: LastPositionR => lastPositionFn(x)
}
def toAllMessage: Option[AllMessage] = fold(
_.event.map(AllMessage.AllEvent(_)),
_ => none,
_ => none,
x => AllMessage.LastAllStreamPosition(x.position).some
)
sealed trait StreamResult
object StreamResult:
import ReadResp.Content as c
final case class EventR(event: Option[sec.Event]) extends StreamResult
final case class CheckpointR(checkpoint: Checkpoint) extends StreamResult
final case class ConfirmationR(confirmation: SubscriptionConfirmation) extends StreamResult
final case class StreamNotFoundR(streamId: StreamId) extends StreamResult
final case class FirstPositionR(position: StreamPosition) extends StreamResult
final case class LastPositionR(position: StreamPosition) extends StreamResult
def fromWire[F[_]](p: ReadResp)(implicit F: MonadThrow[F]): F[StreamResult] = p.content match
case c.Event(v) => mkEvent[F](v).map(EventR(_))
case c.Confirmation(v) => F.pure(ConfirmationR(SubscriptionConfirmation(v.subscriptionId)))
case c.Checkpoint(v) => mkCheckpoint[F](v).map(CheckpointR(_))
case c.StreamNotFound(v) => mkStreamId[F](v.streamIdentifier).map(StreamNotFoundR(_))
case c.FirstStreamPosition(v) => F.pure(FirstPositionR(StreamPosition(v)))
case c.LastStreamPosition(v) => F.pure(LastPositionR(StreamPosition(v)))
case m => F.raiseError(ProtoResultError(s"Unexpected response: $m"))
//
extension (sr: StreamResult)
def fold[A](
eventFn: EventR => A,
checkpointFn: CheckpointR => A,
confirmationFn: ConfirmationR => A,
streamNotFoundFn: StreamNotFoundR => A,
firstPositonFn: FirstPositionR => A,
lastPositionFn: LastPositionR => A
): A = sr match
case x: EventR => eventFn(x)
case x: CheckpointR => checkpointFn(x)
case x: ConfirmationR => confirmationFn(x)
case x: StreamNotFoundR => streamNotFoundFn(x)
case x: FirstPositionR => firstPositonFn(x)
case x: LastPositionR => lastPositionFn(x)
def toStreamMessage: Option[StreamMessage] = fold(
_.event.map(StreamMessage.StreamEvent(_)),
_ => none,
_ => none,
x => StreamMessage.NotFound(x.streamId).some,
x => StreamMessage.FirstStreamPosition(x.position).some,
x => StreamMessage.LastStreamPosition(x.position).some
)
end incoming
end streams