fix: use custom generator in custom builder example (#14320)

crates/node/builder/src/components/builder.rs

@@ -346,8 +346,8 @@ where
         let network = network_builder.build_network(context, pool.clone()).await?;
         let payload_builder =
             payload_builder_builder.build_payload_builder(context, pool.clone()).await?;
-        let payload_builder_handle =
+        let payload_builder_handle = payload_builder_builder
-            payload_builder_builder.spawn_payload_builder_service(context, payload_builder.clone());
+            .spawn_payload_builder_service(context, payload_builder.clone())?;
         let consensus = consensus_builder.build_consensus(context).await?;
 
         Ok(Components {

crates/node/builder/src/components/payload.rs

@@ -30,7 +30,7 @@ pub trait PayloadServiceBuilder<Node: FullNodeTypes, Pool: TransactionPool>: Sen
         self,
         ctx: &BuilderContext<Node>,
         payload_builder: Self::PayloadBuilder,
-    ) -> PayloadBuilderHandle<<Node::Types as NodeTypesWithEngine>::Engine> {
+    ) -> eyre::Result<PayloadBuilderHandle<<Node::Types as NodeTypesWithEngine>::Engine>> {
         let conf = ctx.config().builder.clone();
 
         let payload_job_config = BasicPayloadJobGeneratorConfig::default()
@@ -49,7 +49,7 @@ pub trait PayloadServiceBuilder<Node: FullNodeTypes, Pool: TransactionPool>: Sen
 
         ctx.task_executor().spawn_critical("payload builder service", Box::pin(payload_service));
 
-        payload_service_handle
+        Ok(payload_service_handle)
     }
 }
 

examples/custom-payload-builder/src/main.rs

@@ -11,15 +11,19 @@
 
 #![cfg_attr(not(test), warn(unused_crate_dependencies))]
 
+use crate::generator::EmptyBlockPayloadJobGenerator;
 use reth::{
     builder::{components::PayloadServiceBuilder, node::FullNodeTypes, BuilderContext},
     cli::{config::PayloadBuilderConfig, Cli},
+    providers::CanonStateSubscriptions,
     transaction_pool::{PoolTransaction, TransactionPool},
 };
+use reth_basic_payload_builder::BasicPayloadJobGeneratorConfig;
 use reth_chainspec::ChainSpec;
 use reth_ethereum_payload_builder::{EthereumBuilderConfig, EthereumPayloadBuilder};
 use reth_node_api::NodeTypesWithEngine;
 use reth_node_ethereum::{node::EthereumAddOns, EthEngineTypes, EthEvmConfig, EthereumNode};
+use reth_payload_builder::{PayloadBuilderHandle, PayloadBuilderService};
 use reth_primitives::{EthPrimitives, TransactionSigned};
 
 pub mod generator;
@@ -59,6 +63,34 @@ where
             EthereumBuilderConfig::new(conf.extra_data_bytes()),
         ))
     }
+
+    fn spawn_payload_builder_service(
+        self,
+        ctx: &BuilderContext<Node>,
+        payload_builder: Self::PayloadBuilder,
+    ) -> eyre::Result<PayloadBuilderHandle<<Node::Types as NodeTypesWithEngine>::Engine>> {
+        let conf = ctx.payload_builder_config();
+
+        let payload_job_config = BasicPayloadJobGeneratorConfig::default()
+            .interval(conf.interval())
+            .deadline(conf.deadline())
+            .max_payload_tasks(conf.max_payload_tasks());
+
+        let payload_generator = EmptyBlockPayloadJobGenerator::with_builder(
+            ctx.provider().clone(),
+            ctx.task_executor().clone(),
+            payload_job_config,
+            payload_builder,
+        );
+
+        let (payload_service, payload_builder) =
+            PayloadBuilderService::new(payload_generator, ctx.provider().canonical_state_stream());
+
+        ctx.task_executor()
+            .spawn_critical("custom payload builder service", Box::pin(payload_service));
+
+        Ok(payload_builder)
+    }
 }
 
 fn main() {