public static void UseTransformations <TContext, TBaseContextType>(
this IMiddlewareAppBuilder <TContext, TBaseContextType> subject,
Action <ITransformationMiddlewareBuilder <TContext> > setup)
where TContext : IContext
{
var builder = new TransformationMiddlewareBuilder <TContext>();
setup(builder);
subject.Use(
async(ctx, next) =>
{
var logger = ctx.Services.GetService <ILogger <TransformationMiddlewareBuilder <TContext> > >();
var transforms = builder.Handlers
.Select(async x => await x(ctx))
.ToArray();
await Task.WhenAll(transforms);
var transformedContexts = transforms
.Where(x => !x.IsFaulted && !x.IsCanceled && x.IsCompleted)
.Select(x => x.Result)
.ToArray();
var failedTranformations = transforms
.Where(x => x.IsFaulted || x.IsCanceled)
.Count();
if (failedTranformations != 0)
{
logger.LogWarning("Failed to apply {failed} of {allTranformations}", failedTranformations, transformedContexts.Count());
}
if (!transformedContexts.Any(x => x.transformApplies) ||
transformedContexts.Any(x => x.considerOrigin))
{
await next(ctx);
}
var transformedContextHandlers = transformedContexts
.Where(x => x.transformApplies)
.Select(async x => await next(x.transformed))
.ToArray();
await Task.WhenAll(transformedContextHandlers);
});
}
public static IMiddlewareAppBuilder <TContext, TBaseContextType> UseProjections <TContext, TBaseContextType>(this IMiddlewareAppBuilder <TContext, TBaseContextType> app, Action <IProjectionHostBuilder <TContext> > factory)
where TContext : IContext
{
var projBuilder = new ProjectionHostBuilder <TContext>();
Func <TContext, Func <Task>, Task> middleware =
(ctx, next) =>
{
throw new ArgumentNullException("There is no handler for the projection middleware. Did you forget to build the AppBuilder?");
};
factory(projBuilder);
app.Use((ctx, next) => middleware(ctx, next));
app.Configure(() => middleware = projBuilder.Build());
return(app);
}
