validator_discovery: less flexible, but simpler design (#3052)

* validator_discovery: less flexible, but simpler design

* fix test

* remove unused struct

* smol optimization

polkadot/node/network/availability-distribution/src/lib.rs

@@ -36,7 +36,6 @@ use requester::Requester;
 
 /// Handing requests for PoVs during backing.
 mod pov_requester;
-use pov_requester::PoVRequester;
 
 /// Responding to erasure chunk requests:
 mod responder;
@@ -90,7 +89,6 @@ impl AvailabilityDistributionSubsystem {
 		Context: SubsystemContext<Message = AvailabilityDistributionMessage> + Sync + Send,
 	{
 		let mut requester = Requester::new(self.metrics.clone()).fuse();
-		let mut pov_requester = PoVRequester::new();
 		loop {
 			let action = {
 				let mut subsystem_next = ctx.recv().fuse();
@@ -113,18 +111,6 @@ impl AvailabilityDistributionSubsystem {
 			};
 			match message {
 				FromOverseer::Signal(OverseerSignal::ActiveLeaves(update)) => {
-					let result = pov_requester.update_connected_validators(
-						&mut ctx,
-						&mut self.runtime,
-						&update,
-					).await;
-					if let Err(error) = result {
-						tracing::debug!(
-							target: LOG_TARGET,
-							?error,
-							"PoVRequester::update_connected_validators",
-						);
-					}
 					log_error(
 						requester.get_mut().update_fetching_heads(&mut ctx, &mut self.runtime, update).await,
 						"Error in Requester::update_fetching_heads"
@@ -154,7 +140,7 @@ impl AvailabilityDistributionSubsystem {
 					},
 				} => {
 					log_error(
-						pov_requester.fetch_pov(
+						pov_requester::fetch_pov(
 							&mut ctx,
 							&mut self.runtime,
 							relay_parent,
@@ -163,7 +149,7 @@ impl AvailabilityDistributionSubsystem {
 							pov_hash,
 							tx,
 						).await,
-						"PoVRequester::fetch_pov"
+						"pov_requester::fetch_pov"
 					)?;
 				}
 			}