public async Task ElTestoAsync()
{
var request = new SomeOperationRequest();
var validateApiKey = GetApiKey().ToValidation(new ValidationFailure("ApiKey", "API Key is missing in headers"));
var v = from v1 in validateApiKey
from v2 in Validate(request)
select v1 + v2;
var appCode = from key in v.ToOption()
from code in GetAppCode(key)
select code;
TryAsync <Result <SomeOperationResult> > bloo = from req in TryAsync(request)
from code in appCode.ToTryAsync()
select StartPaymentAsync(req, code);
string message = await bloo.Match(
Succ : tryRes => tryRes.Match(
Succ: payRes => $"Payment succeeded! PaymentID = {payRes.PaymentId}",
Fail: ex => ex.Message),
Fail : ex => ex.Message);
message.Should().Contain("42");
}
public async Task Handle(DocumentSentForApprovalEventDto notification, CancellationToken cancellationToken)
{
TryAsync <Unit> handle = async() =>
await _updateDocumentStatus(notification.Id, DocumentStatus.WaitingForApproval.ToString()).ToUnit();
await handle.Match(
Succ : u => { },
Fail : ex => _logger.LogError($"Error while handling {nameof(DocumentSentForApprovalEventDto)}: {ex}"));
}
public async Task Handle(DocumentUpdatedEventDto notification, CancellationToken cancellationToken)
{
TryAsync <Unit> handle = async() =>
await _updateDocument(notification.Id, notification.Number, notification.Description).ToUnit();
await handle.Match(
Succ : u => { },
Fail : ex => _logger.LogError($"Error while handling {nameof(DocumentUpdatedEventDto)}: {ex}"));
}
public async Task Handle(UserCreatedEventDto notification, CancellationToken cancellationToken)
{
TryAsync <Unit> handle = async() =>
await _addUser(notification.Id, notification.Email, notification.FirebaseId)
.ToUnit();
await handle.Match(
Succ : _ => { },
Fail : ex => _logger.LogError($"Error while handling {nameof(UserCreatedEventDto)}: {ex}"));
}
public async Task Handle(FileAddedEventDto notification, CancellationToken cancellationToken)
{
TryAsync <Unit> handle = async() =>
await _addFile(notification.FileId, notification.Id, notification.FileName,
notification.FileDescription).ToUnit();
await handle.Match(
Succ : u => { },
Fail : ex => _logger.LogError($"Error while handling {nameof(FileAddedEventDto)}: {ex}"));
}
public async Task Handle(DocumentApprovedEventDto notification, CancellationToken cancellationToken)
{
TryAsync <Unit> handle = async() =>
await _approveDocument(notification.Id, DocumentStatus.Approved.ToString(), notification.Comment)
.ToUnit();
await handle.Match(
Succ : u => { },
Fail : ex => _logger.LogError($"Error while handling {nameof(DocumentApprovedEventDto)}: {ex}"));
}
public async Task <IActionResult> Get()
{
TryAsync <Lst <Contract.DTO.Chat.Channel> > svcResult = async() => await _chatService.GetAllChannels();
var result = svcResult.Match <Lst <Contract.DTO.Chat.Channel>, IActionResult>(
Succ: model => Ok(model.Select(p => p.Name).ToList()),
Fail: ex => StatusCode(500, ex)
);
return(await result);
}
public async Task <IActionResult> Post([FromBody] Channel channel)
{
var model = _mapper.Map <Channel, Contract.DTO.Chat.Channel>(channel);
TryAsync <Unit> svcResult = async() => await _chatService.AddChannel(model);
var result = svcResult.Match <Unit, IActionResult>(
Succ: unit => NoContent(),
Fail: ex => StatusCode(500, ex)
);
return(await result);
}
private OptionAsync <Config> LoadAkkaConfig()
{
TryAsync <Config> tryLoadAkkaConfig =
async() => ConfigurationFactory.ParseString(await File.ReadAllTextAsync("hocon.txt"));
return(tryLoadAkkaConfig.Match(
akkaConfig => akkaConfig,
ex =>
{
_logger.LogError("Failed to load akka config");
return (Config)null;
}));
}
public async Task <IActionResult> Post([FromBody] Message message, int channelId)
{
message.ChannelId = channelId;
var model = _mapper.Map <Message, Contract.DTO.Chat.Message>(message);
TryAsync <Unit> svcResult = async() => await _chatService.AddMessage(model);
var result = svcResult.Match <Unit, IActionResult>(
Succ: unit => NoContent(),
Fail: ex => StatusCode(500, ex)
);
return(await result);
}
public async Task <IActionResult> Get(int channelId)
{
TryAsync <Lst <Contract.DTO.Chat.Message> > svcResult = async() => await _chatService.GetAllMessagesInChannel(channelId);
var result = svcResult.Match <Lst <Contract.DTO.Chat.Message>, IActionResult>(
Succ: model =>
{
var messages = model.Select(p => p.Content).ToList();
return(Ok(messages));
},
Fail: ex => StatusCode(500, ex)
);
return(await result);
}
public static Task <Either <L, A> > ToEither <A, L>(this TryAsync <A> self, Func <Exception, L> Fail) =>
self.Match(
Succ: v => Either <L, A> .Right(v),
Fail: x => Either <L, A> .Left(Fail(x)));
public static Task <Either <Exception, A> > ToEither <A>(this TryAsync <A> self) =>
self.Match(
Succ: v => Either <Exception, A> .Right(v),
Fail: x => Either <Exception, A> .Left(x));
public static Task <OptionUnsafe <A> > ToOptionUnsafe <A>(this TryAsync <A> self) =>
self.Match(
Succ: v => OptionUnsafe <A> .Some(v),
Fail: _ => OptionUnsafe <A> .None);
public static Task <Validation <FAIL, A> > ToValidation <A, FAIL>(this TryAsync <A> self, Func <Exception, FAIL> Fail) =>
self.Match(
Succ: v => Success <FAIL, A>(v),
Fail: e => Fail <FAIL, A>(Fail(e)));
public static Task <IActionResult> ToActionResult <T>(this TryAsync <T> self, Func <T, IActionResult> succ = null, Func <Exception, IActionResult> fail = null) => self.Match(Succ: succ ?? GetGenericSuccessResult, Fail: fail ?? GetGenericErrorResult);
/// <summary> /// Success case is converted to 200 OK. /// Exception is converted to 500 Server Error. /// </summary> /// <typeparam name="T"></typeparam> /// <param name="try"></param> /// <returns></returns> public static Task <IActionResult> ToActionResult <T>(this TryAsync <T> @try) => @try.Match(Ok, ServerError);
public static Task <R> match <T, R>(TryAsync <T> self, Func <T, R> Succ, R Fail) => self.Match(Succ, Fail);
/// <summary> /// Pattern matches the two possible states of the TryAsync computation /// </summary> /// <typeparam name="T">Type of the bound value</typeparam> /// <param name="self">TryAsync computation</param> /// <param name="Succ">Delegate to invoke if the TryAsync computation completes successfully</param> /// <param name="Fail">Delegate to invoke if the TryAsync computation fails</param> public static Task <Unit> match <T>(TryAsync <T> self, Action <T> Succ, Action <Exception> Fail) => self.Match(Succ, Fail);
public TryAsync <B> Map(TryAsync <A> ma, Func <A, B> f) => () =>
ma.Match(
Succ: x => new Result <B>(f(x)),
Fail: e => new Result <B>(e));
/// <summary>
/// Converts a <see cref="TryAsync{A}"/> to an <see cref="IActionResult"/>.
/// Default success case conversion will convert units to NoContent and all other values to Ok.
/// Default failure case conversion will convert exceptions to an InternalServerError.
/// </summary>
/// <typeparam name="A">The <see cref="TryAsync{A}"/> parameter type.</typeparam>
/// <param name="this">The <see cref="TryAsync{A}"/> to convert to an <see cref="IActionResult"/>.</param>
/// <param name="Succ">Optionally, a custom conversion for the success case.</param>
/// <param name="Fail">Optionally, a custom conversion for the failure case.</param>
/// <returns>An <see cref="IActionResult"/> which can be returned from a controller.</returns>
public static Task <IActionResult> ToActionResult <T>(this TryAsync <T> @this, Func <T, IActionResult> Succ = null, Func <Exception, IActionResult> Fail = null) =>
@this.Match(Succ: Succ ?? GetGenericSuccessResult, Fail: Fail ?? GetGenericErrorResult);
public static Task <Validation <Exception, A> > ToValidation <A>(this TryAsync <A> self) =>
self.Match(
Succ: v => Success <Exception, A>(v),
Fail: e => Fail <Exception, A>(e));
/// <summary> /// By default, Success case is converted to 200 OK and an Exception is converted to 500 Server Error. /// Optionally, provide mapping functions for Success and Exception. /// </summary> /// <typeparam name="T"></typeparam> /// <param name="try"></param> /// <param name="success"></param> /// <param name="fail"></param> /// <returns></returns> public static Task <IActionResult> ToActionResult <T>(this TryAsync <T> @try, Func <T, IActionResult> success = null, Func <Exception, IActionResult> fail = null) => @try.Match(success ?? Ok, fail ?? ServerError);
public static Task <IEnumerable <A> > AsEnumerable <A>(this TryAsync <A> self) =>
self.Match(
Succ: v => new A[1] {
v
}.AsEnumerable(),
Fail: x => new A[0].AsEnumerable());
public static Task <Seq <A> > AsEnumerable <A>(this TryAsync <A> self) =>
self.Match(
Succ: v => v.Cons(Empty),
Fail: x => Empty);
public Task <Unit> Fail(Action <Exception> f) => value.Match(succHandler, f);
public static Task <string> AsString <A>(this TryAsync <A> self) =>
self.Match(
Succ: v => isnull(v)
? "Succ(null)"
: $"Succ({v})",
Fail: ex => $"Fail({ex.Message})");
public Task <B> Fail(Func <Exception, B> f) => value.Match(succHandler, f);
public TryAsync <B> BiMap(TryAsync <A> ma, Func <A, B> fa, Func <Unit, B> fb) => () =>
ma.Match(
Succ: x => new Result <B>(fa(x)),
Fail: _ => new Result <B>(fb(unit)));
/// <summary>
/// By default, Success case is converted to 200 OK and an Exception is converted to 500 Server Error.
///
/// Optional: provide mapping function for Success.
/// Optional: provide action for Exception logging. Returns 500 Status Code with empty body.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="try"></param>
/// <param name="success"></param>
/// <param name="fail"></param>
/// <returns></returns>
public static Task <IActionResult> ToActionResult <T>(this TryAsync <T> @try, Func <T, IActionResult> success = null, Action <Exception> fail = null) =>
@try.Match(success ?? Ok,
Fail: e => ServerErrorWithLogging(e, fail));