public static Links StreamMessageNavigation(
this Links links,
StreamMessage message,
ReadStreamMessageByStreamVersionOperation operation)
{
links.Add(Constants.Relations.First, $"{StreamId(operation)}/0");
if (operation.StreamVersion > 0)
{
links.Add(Constants.Relations.Previous, $"{StreamId(operation)}/{operation.StreamVersion - 1}");
}
if (message.StreamId != default)
{
links.Add(Constants.Relations.Next, $"{StreamId(operation)}/{operation.StreamVersion + 1}");
}
return(links.Add(Constants.Relations.Last, $"{StreamId(operation)}/-1")
.Add(
Constants.Relations.Feed,
Links.FormatBackwardLink(
StreamId(operation),
Constants.MaxCount,
StreamVersion.End,
false),
operation.StreamId)
.Add(
Constants.Relations.Message,
$"{StreamId(operation)}/{operation.StreamVersion}",
$"{operation.StreamId}@{operation.StreamVersion}").Self());
}
public async Task <Response> Get(
ReadAllStreamMessageOperation operation,
CancellationToken cancellationToken)
{
var message = await operation.Invoke(_streamStore, cancellationToken);
var links = Links
.FromOperation(operation)
.Index()
.Find()
.Browse()
.Add(
Constants.Relations.Message,
$"stream/{message.Position}",
$"{message.StreamId}@{message.StreamVersion}").Self()
.Add(
Constants.Relations.Feed,
Links.FormatBackwardLink(
Constants.Streams.All,
Constants.MaxCount,
Position.End,
false));
if (message.MessageId == Guid.Empty)
{
return(new HalJsonResponse(
new HALResponse(null)
.AddLinks(links),
404));
}
var payload = await message.GetJsonData(cancellationToken);
return(new HalJsonResponse(new StreamMessageHALResponse(message, payload).AddLinks(links)));
}
public static Links StreamsNavigation(this Links links, ReadStreamPage page, ReadStreamOperation operation)
{
var baseAddress = $"streams/{operation.StreamId}";
var first = Links.FormatForwardLink(
baseAddress,
operation.MaxCount,
StreamVersion.Start,
operation.EmbedPayload);
var last = Links.FormatBackwardLink(
baseAddress,
operation.MaxCount,
StreamVersion.End,
operation.EmbedPayload);
links.Add(Constants.Relations.First, first);
if (operation.Self != first && !page.IsEnd)
{
links.Add(
Constants.Relations.Previous,
Links.FormatBackwardLink(
baseAddress,
operation.MaxCount,
page.Messages.Min(m => m.StreamVersion) - 1,
operation.EmbedPayload));
}
links.Add(Constants.Relations.Feed, operation.Self, operation.StreamId).Self();
if (operation.Self != last && !page.IsEnd)
{
links.Add(
Constants.Relations.Next,
Links.FormatForwardLink(
baseAddress,
operation.MaxCount,
page.Messages.Max(m => m.StreamVersion) + 1,
operation.EmbedPayload));
}
links.Add(Constants.Relations.Last, last)
.Add(Constants.Relations.Metadata,
$"{baseAddress}/metadata");
return(links);
}
public static Links AllStreamNavigation(
this Links links,
ReadAllPage page,
ReadAllStreamOperation operation)
{
var first = Links.FormatForwardLink(
Constants.Streams.All,
operation.MaxCount,
Position.Start,
operation.EmbedPayload);
var last = Links.FormatBackwardLink(
Constants.Streams.All,
operation.MaxCount,
Position.End,
operation.EmbedPayload);
links.Add(Constants.Relations.First, first);
if (operation.Self != first && !page.IsEnd)
{
links.Add(
Constants.Relations.Previous,
Links.FormatBackwardLink(
Constants.Streams.All,
operation.MaxCount,
page.Messages.Min(m => m.Position) - 1,
operation.EmbedPayload));
}
links.Add(Constants.Relations.Feed, operation.Self).Self();
if (operation.Self != last && !page.IsEnd)
{
links.Add(
Constants.Relations.Next,
Links.FormatForwardLink(
Constants.Streams.All,
operation.MaxCount,
page.Messages.Max(m => m.Position) + 1,
operation.EmbedPayload));
}
links.Add(Constants.Relations.Last, last);
return(links);
}
public ReadAllStreamOperation(HttpRequest request)
{
Path = request.Path;
EmbedPayload = request.Query.TryGetValueCaseInsensitive('e', out var embedPayload) &&
embedPayload == "1";
ReadDirection = request.Query.TryGetValueCaseInsensitive('d', out var readDirection) &&
readDirection == "f" || readDirection == "F"
? Constants.ReadDirection.Forwards
: Constants.ReadDirection.Backwards;
_fromPositionInclusive = request.Query.TryGetValueCaseInsensitive('p', out var position)
? (long.TryParse(position, out _fromPositionInclusive)
? (_fromPositionInclusive < Position.End
? Position.End
: _fromPositionInclusive)
: (ReadDirection == Constants.ReadDirection.Forwards
? Position.Start
: Position.End))
: (ReadDirection == Constants.ReadDirection.Forwards
? Position.Start
: Position.End);
_maxCount = request.Query.TryGetValueCaseInsensitive('m', out var maxCount)
? (int.TryParse(maxCount, out _maxCount)
? (_maxCount <= 0
? Constants.MaxCount
: _maxCount)
: Constants.MaxCount)
: Constants.MaxCount;
Self = ReadDirection == Constants.ReadDirection.Forwards
? Links.FormatForwardLink(
Constants.Streams.All,
MaxCount,
FromPositionInclusive,
EmbedPayload)
: Links.FormatBackwardLink(
Constants.Streams.All,
MaxCount,
FromPositionInclusive,
EmbedPayload);
IsUriCanonical = Self.Remove(0, Constants.Streams.All.Length)
== request.QueryString.ToUriComponent();
}
public ReadStreamOperation(HttpRequest request)
{
Path = request.Path;
StreamId = request.Path.Value.Remove(0, 2 + Constants.Streams.Stream.Length);
EmbedPayload = request.Query.TryGetValueCaseInsensitive('e', out var embedPayload) &&
embedPayload == "1";
ReadDirection = request.Query.TryGetValueCaseInsensitive('d', out var readDirection) &&
readDirection == "f" || readDirection == "F"
? Constants.ReadDirection.Forwards
: Constants.ReadDirection.Backwards;
_fromVersionInclusive = request.Query.TryGetValueCaseInsensitive('p', out var position)
? int.TryParse(position, out _fromVersionInclusive)
? ReadDirection == Constants.ReadDirection.Forwards
? _fromVersionInclusive < StreamVersion.Start
? StreamVersion.Start
: _fromVersionInclusive
: _fromVersionInclusive < StreamVersion.End
? StreamVersion.End
: _fromVersionInclusive
: ReadDirection == Constants.ReadDirection.Forwards
? StreamVersion.Start
: StreamVersion.End
: ReadDirection == Constants.ReadDirection.Forwards
? StreamVersion.Start
: StreamVersion.End;
_maxCount = request.Query.TryGetValueCaseInsensitive('m', out var maxCount)
? int.TryParse(maxCount, out _maxCount)
? _maxCount <= 0
? Constants.MaxCount
: _maxCount
: Constants.MaxCount
: Constants.MaxCount;
var baseAddress = $"streams/{StreamId}";
Self = ReadDirection == Constants.ReadDirection.Forwards
? Links.FormatForwardLink(baseAddress, MaxCount, FromVersionInclusive, EmbedPayload)
: Links.FormatBackwardLink(baseAddress, MaxCount, FromVersionInclusive, EmbedPayload);
IsUriCanonical = Self.Remove(0, baseAddress.Length)
== request.QueryString.ToUriComponent();
}
public async Task all_stream_head_link(HttpMethod method)
{
await _fixture.WriteNMessages(StreamId, 10);
var position = await _fixture.StreamStore.ReadHeadPosition();
using (var response = await _fixture.HttpClient.SendAsync(
new HttpRequestMessage(
method,
Links.FormatBackwardLink("/stream", 20, Position.End, true))))
{
response.IsSuccessStatusCode.ShouldBeTrue();
response.Headers.GetValues(Constants.Headers.HeadPosition)
.ShouldBe(new[] { $"{position}" });
}
}
