private static Link Feed(ReadStreamMessageByStreamVersionOperation operation) => new Link(
Constants.Relations.Feed,
LinkFormatter.FormatBackwardLink(
$"../{operation.StreamId}",
Constants.MaxCount,
StreamVersion.End,
false));
public async Task <Response> GetMessage(
ReadStreamMessageByStreamVersionOperation operation,
CancellationToken cancellationToken)
{
var message = await operation.Invoke(_streamStore, cancellationToken);
if (message.MessageId == Guid.Empty)
{
return(new Response(
new HALResponse(new
{
operation.StreamId,
operation.StreamVersion
})
.AddLinks(Links.Self(operation))
.AddLinks(Links.Navigation(operation))
.AddLinks(Links.Message(operation)),
404));
}
if (operation.StreamVersion == StreamVersion.End)
{
return(new Response(new HALResponse(new object()), 307)
{
Headers =
{
[Constants.Headers.Location] = new[] { $"{message.StreamVersion}" }
}
});
}
var payload = await message.GetJsonData(cancellationToken);
return(new Response(
new HALResponse(new
{
message.MessageId,
message.CreatedUtc,
message.Position,
message.StreamId,
message.StreamVersion,
message.Type,
payload,
metadata = message.JsonMetadata
})
.AddLinks(Links.Self(operation))
.AddLinks(Links.Navigation(operation, message))
.AddLinks(Links.Message(operation))));
}
public static IEnumerable <Link> Navigation(
ReadStreamMessageByStreamVersionOperation operation,
StreamMessage message = default(StreamMessage))
{
yield return(First());
if (operation.StreamVersion > 0)
{
yield return(Previous(operation));
}
if (message.MessageId != default(Guid))
{
yield return(Next(operation));
}
yield return(Last());
yield return(Feed(operation));
}
public static Link Message(ReadStreamMessageByStreamVersionOperation operation) => new Link(
Constants.Relations.Message,
$"{operation.StreamVersion}");
private static Link Next(ReadStreamMessageByStreamVersionOperation operation) => new Link(
Constants.Relations.Next,
$"{operation.StreamVersion + 1}");
private static Link Previous(ReadStreamMessageByStreamVersionOperation operation) => new Link(
Constants.Relations.Previous,
$"{operation.StreamVersion - 1}");
public async Task <Response> Get(
ReadStreamMessageByStreamVersionOperation operation,
CancellationToken cancellationToken)
{
var message = await operation.Invoke(_streamStore, cancellationToken);
if (message.MessageId == Guid.Empty)
{
return(new Response(
new HALResponse(new
{
operation.StreamId,
operation.StreamVersion
})
.AddLinks(Links.Self(operation))
.AddLinks(Links.Navigation(operation))
.AddLinks(Links.Message(operation))
.AddLinks(Links.Find()),
404));
}
if (operation.StreamVersion == StreamVersion.End)
{
return(new Response(new HALResponse(new object()), 307)
{
Headers =
{
[Constants.Headers.Location] = new[] { $"{message.StreamVersion}" }
}
});
}
var payload = await message.GetJsonData(cancellationToken);
var eTag = ETag.FromStreamVersion(message.StreamVersion);
return(new Response(
new HALResponse(new
{
message.MessageId,
message.CreatedUtc,
message.Position,
message.StreamId,
message.StreamVersion,
message.Type,
payload,
metadata = message.JsonMetadata
})
.AddEmbeddedResource(
Constants.Relations.Delete,
Schemas.DeleteStreamMessage)
.AddLinks(Links.Self(operation))
.AddLinks(Links.Navigation(operation, message))
.AddLinks(Links.Message(operation))
.AddLinks(Links.Find()))
{
Headers =
{
eTag,
CacheControl.OneYear
}
});
}
