Innovenergy_trunk/csharp/lib/Utils/Try/TryAsync.async.cs

namespace InnovEnergy.Lib.Utils.Try;


public partial class TryAsync<R>
{
    public TryAsync<R> OnError<E>(Func<E, Task<R>> onError) where E:Exception
    {
        async Task<R> TryIt()
        {
            try
            {
                return await Func();
            }
            catch (E e)
            {
                return await onError(e);
            }
        }

        return new TryAsync<R>(TryIt);
    }

    public TryAsync<R> OnError<E>(Func<E, Func<Task<R>>, Task<R>> onError) where E : Exception
    {
        async Task<R> TryIt()
        {
            try
            {
                return await Func();
            }
            catch (E e)
            {
                return await onError(e, Func);
            }
        }

        return new TryAsync<R>(TryIt);
    }


    public TryAsync<R> Retry<E>(Func<E, Task<Boolean>> shouldRetry) where E:Exception
    {
        async Task<R> TryIt()
        {
            while(true)
            {
                try
                {
                    return await Func();
                }
                catch (E e)
                {
                    if (! await shouldRetry(e))
                        throw;
                }
            }
        }

        return new TryAsync<R>(TryIt);
    }

    public TryAsync<R> OnErrorDo<E>(Func<E, Task> onError) where E:Exception
    {
        async Task<R> TryIt()
        {
            try
            {
                return await Func();
            }
            catch (E e)
            {
                await onError(e);
                throw;
            }
        }

        return new TryAsync<R>(TryIt);
    }

    public TryAsync<R> OnSuccessDo(Func<R, Task> onSuccess)
    {
        async Task<R> DoIt()
        {
            var result = await Func();
            await onSuccess(result);
            return result;
        }

        return new TryAsync<R>(DoIt);
    }

    public TryAsync<S> ThenTry<S>(Func<R, Task<S>> map)
    {
        async Task<S> MapIt()
        {
            var r = await Throw();
            return await map(r);
        }

        return new TryAsync<S>(MapIt);
    }

    public TryAsync<S> Block<S>(Func<TryAsync<R>, TryAsync<S>> map)
    {
        return map(this);
    }
}