feat: allow for user defined checkpoint metadata

Author: akundaz

examples/checkpoints-eth.rs

@@ -40,7 +40,13 @@ fn main() -> eyre::Result<()> {
 
 	// Checkpoints can be applied on top of each other, creating a progressive
 	// history of state changes.
-	let payload = start.apply(tx1)?.apply(bundle)?.apply(tx4)?;
+	let payload = start
+		.execute(tx1)?
+		.apply()
+		.execute(bundle)?
+		.apply()
+		.execute(tx4)?
+		.apply();
 	let built_payload = payload
 		.build_payload()
 		.expect("payload should be built successfully");

examples/checkpoints-op.rs

@@ -40,7 +40,13 @@ fn main() -> eyre::Result<()> {
 
 	// Checkpoints can be applied on top of each other, creating a progressive
 	// history of state changes.
-	let payload = start.apply(tx1)?.apply(bundle)?.apply(tx4)?;
+	let payload = start
+		.execute(tx1)?
+		.apply()
+		.execute(bundle)?
+		.apply()
+		.execute(tx4)?
+		.apply();
 	let built_payload = payload
 		.build_payload()
 		.expect("payload should be built successfully");

examples/custom-bundle-type.rs

@@ -30,6 +30,7 @@ struct CustomPlatform;
 
 impl Platform for CustomPlatform {
 	type Bundle = CustomBundleType;
+	type CheckpointMetadata = EmptyMetadata;
 	type DefaultLimits = types::DefaultLimits<Optimism>;
 	type EvmConfig = types::EvmConfig<Optimism>;
 	type NodeTypes = types::NodeTypes<Optimism>;
@@ -79,7 +80,13 @@ fn main() -> eyre::Result<()> {
 		.with_transaction(tx2)
 		.with_transaction(tx3);
 
-	let payload = start.apply(tx1)?.apply(bundle)?.apply(tx4)?;
+	let payload = start
+		.execute(tx1)?
+		.apply()
+		.execute(bundle)?
+		.apply()
+		.execute(tx4)?
+		.apply();
 
 	let tx5 = transfer_tx(&FundedAccounts::signer(2), 0, U256::from(15_000u64));
 	let tx6 = transfer_tx(&FundedAccounts::signer(3), 0, U256::from(7_500u64));
@@ -91,7 +98,7 @@ fn main() -> eyre::Result<()> {
 	// ensure that custom bundle logic is applied correctly and bundles that do
 	// not meet the minimum profit are rejected.
 	assert!(matches!(
-		payload.apply(failing_bundle),
+		payload.execute(failing_bundle),
 		Err(ExecutionError::InvalidBundlePostExecutionState(
 			MinimumProfitNotMet { .. }
 		))
@@ -177,7 +184,11 @@ impl Bundle<CustomPlatform> for CustomBundleType {
 		}
 	}
 
-	fn is_eligible(&self, _: &BlockContext<CustomPlatform>) -> Eligibility {
+	fn is_eligible(
+		&self,
+		_: &BlockContext<CustomPlatform>,
+		_: &EmptyMetadata,
+	) -> Eligibility {
 		Eligibility::Eligible
 	}