private async Task ReceiveActivityInternal(IBotContext context, IReceiveActivity[] middleware, Func <IBotContext, Task> callback)
{
BotAssert.MiddlewareNotNull(middleware);
if (middleware.Length == 0) // No middleware to run.
{
// If all the Middlware ran, the "leading edge" of the tree is now complete.
// This means it's time to run any developer specified callback.
// Once this callback is done, the "trailing edge" calls are then completed. This
// allows code that looks like:
// console.print("before");
// await next();
// console.print("after");
// to run as expected.
if (callback != null)
{
await callback(context);
}
return;
}
// Default to "No more Middleware after this"
async Task next()
{
// Remove the first item from the list of middleware to call,
// so that the next call just has the remaining items to worry about.
IReceiveActivity[] remainingMiddleware = middleware.Skip(1).ToArray();
await ReceiveActivityInternal(context, remainingMiddleware, callback).ConfigureAwait(false);
}
// Grab the current middleware, which is the 1st element in the array, and execute it
await middleware[0].ReceiveActivity(context, next).ConfigureAwait(false);
}
private async Task <bool> ReceiveActivityInternal(IBotContext context, IReceiveActivity[] middleware)
{
BotAssert.MiddlewareNotNull(middleware);
bool didAllRun = false;
if (middleware.Length == 0) // No middleware to run.
{
// If all the Middlware ran, let the caller know.
return(true);
}
// Default to "No more Middleware after this"
async Task next()
{
// Remove the first item from the list of middleware to call,
// so that the next call just has the remaining items to worry about.
IReceiveActivity[] remainingMiddleware = middleware.Skip(1).ToArray();
didAllRun |= await ReceiveActivityInternal(context, remainingMiddleware).ConfigureAwait(false);
}
// Grab the current middleware, which is the 1st element in the array, and execute it
await middleware[0].ReceiveActivity(context, next).ConfigureAwait(false);
return(didAllRun);
}
private async Task ContextCreatedInternal(IBotContext context, IContextCreated[] middleware)
{
BotAssert.MiddlewareNotNull(middleware);
if (middleware.Length == 0) // No middleware to run.
{
return;
}
async Task next()
{
// Remove the first item from the list of middleware to call,
// so that the next call just has the remaining items to worry about.
IContextCreated[] remainingMiddleware = middleware.Skip(1).ToArray();
await ContextCreatedInternal(context, remainingMiddleware).ConfigureAwait(false);
}
// Grab the current middleware, which is the 1st element in the array, and execute it
await middleware[0].ContextCreated(context, next).ConfigureAwait(false);
}
public MiddlewareSet Use(IMiddleware middleware)
{
BotAssert.MiddlewareNotNull(middleware);
_middleware.Add(middleware);
return(this);
}
