private Task <StreamSubscription> SubscribeToStreamAsync(string streamName,
StreamRevision start,
Func <StreamSubscription, ResolvedEvent, CancellationToken, Task> eventAppeared,
EventStoreClientOperationOptions operationOptions,
bool resolveLinkTos = false,
Action <StreamSubscription, SubscriptionDroppedReason, Exception> subscriptionDropped = default,
UserCredentials userCredentials = default,
CancellationToken cancellationToken = default)
{
operationOptions.TimeoutAfter = DeadLine.None;
return(StreamSubscription.Confirm(ReadInternal(new ReadReq {
Options = new ReadReq.Types.Options {
ReadDirection = ReadReq.Types.Options.Types.ReadDirection.Forwards,
ResolveLinks = resolveLinkTos,
Stream = start == StreamRevision.End
? new ReadReq.Types.Options.Types.StreamOptions {
End = new Empty(),
StreamName = streamName
}
: new ReadReq.Types.Options.Types.StreamOptions {
Revision = start,
StreamName = streamName
},
Subscription = new ReadReq.Types.Options.Types.SubscriptionOptions()
}
},
operationOptions, userCredentials, cancellationToken), eventAppeared, subscriptionDropped, _log,
cancellationToken: cancellationToken));
}
private StreamSubscription SubscribeToStream(string streamName,
StreamRevision start,
Func <StreamSubscription, ResolvedEvent, CancellationToken, Task> eventAppeared,
EventStoreClientOperationOptions operationOptions,
bool resolveLinkTos = false,
Action <StreamSubscription, SubscriptionDroppedReason, Exception> subscriptionDropped = default,
UserCredentials userCredentials = default,
CancellationToken cancellationToken = default)
{
operationOptions.TimeoutAfter = DeadLine.None;
var subscription = new StreamSubscription(ReadInternal(new ReadReq {
Options = new ReadReq.Types.Options {
ReadDirection = ReadReq.Types.Options.Types.ReadDirection.Forwards,
ResolveLinks = resolveLinkTos,
Stream = ReadReq.Types.Options.Types.StreamOptions.FromStreamNameAndRevision(streamName,
start),
Subscription = new ReadReq.Types.Options.Types.SubscriptionOptions()
}
},
operationOptions, userCredentials, cancellationToken), eventAppeared,
subscriptionDropped);
return(subscription);
}
private void HandleDrop(
StreamSubscription arg1,
SubscriptionDroppedReason arg2,
Exception?arg3)
{
_log.LogWarning($"Subscription {SubscriptionId} dropped. Reason: {arg2}");
}
/// <summary>
/// Wrap event handling and checkpoint updates in a transaction.
/// </summary>
/// <param name="_"></param>
/// <param name="e"></param>
/// <param name="ct"></param>
private async Task TransactionalHandler(
StreamSubscription _,
ResolvedEvent e,
CancellationToken ct)
{
try
{
_log.LogDebug($"Subscription {SubscriptionId} got an event {e.Event.EventType}");
using var tx = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled);
await Handler(AsReceivedEvent(e), ct);
tx.Complete();
}
catch (Exception exception)
{
_log.LogError(exception.ToString());
throw;
}
ReceivedEvent AsReceivedEvent(ResolvedEvent re)
{
var evt = DeserializeData(
re.Event.ContentType,
re.Event.EventType,
re.Event.Data,
re.Event.EventStreamId,
re.Event.EventNumber
);
return(new ReceivedEvent(
re.Event.EventId.ToString(),
re.Event.EventType,
re.Event.ContentType,
re.Event.Position.CommitPosition,
re.Event.Position.CommitPosition,
re.OriginalStreamId,
re.Event.EventNumber,
re.Event.Created,
evt
));
}
}
private Task <StreamSubscription> SubscribeToAllAsync(Position start,
Func <StreamSubscription, ResolvedEvent, CancellationToken, Task> eventAppeared,
EventStoreClientOperationOptions operationOptions,
bool resolveLinkTos = false,
Action <StreamSubscription, SubscriptionDroppedReason, Exception> subscriptionDropped = default,
SubscriptionFilterOptions filterOptions = null,
UserCredentials userCredentials = default,
CancellationToken cancellationToken = default)
{
operationOptions.TimeoutAfter = DeadLine.None;
return(StreamSubscription.Confirm(ReadInternal(new ReadReq {
Options = new ReadReq.Types.Options {
ReadDirection = ReadReq.Types.Options.Types.ReadDirection.Forwards,
ResolveLinks = resolveLinkTos,
All = ReadReq.Types.Options.Types.AllOptions.FromPosition(start),
Subscription = new ReadReq.Types.Options.Types.SubscriptionOptions(),
Filter = GetFilterOptions(filterOptions)
}
}, operationOptions, userCredentials, cancellationToken), eventAppeared, subscriptionDropped, _log,
filterOptions?.CheckpointReached, cancellationToken));
}
private StreamSubscription SubscribeToAll(
Func <StreamSubscription, ResolvedEvent, CancellationToken, Task> eventAppeared,
EventStoreClientOperationOptions operationOptions,
bool resolveLinkTos = false,
Action <StreamSubscription, SubscriptionDroppedReason, Exception> subscriptionDropped = default,
IEventFilter filter = null,
UserCredentials userCredentials = default,
CancellationToken cancellationToken = default)
{
operationOptions.TimeoutAfter = DeadLine.None;
var subscription = new StreamSubscription(ReadInternal(new ReadReq {
Options = new ReadReq.Types.Options {
ReadDirection = ReadReq.Types.Options.Types.ReadDirection.Forwards,
ResolveLinks = resolveLinkTos,
All = ReadReq.Types.Options.Types.AllOptions.FromPosition(Position.Start),
Subscription = new ReadReq.Types.Options.Types.SubscriptionOptions(),
Filter = GetFilterOptions(filter)
}
}, operationOptions, userCredentials, cancellationToken), eventAppeared,
subscriptionDropped);
return(subscription);
}
private async Task SubscribeReturn(EventStore.Client.StreamSubscription ss, ResolvedEvent vnt, CancellationToken ct)
{
await SayHello(vnt.ToJson());
}
