fix: Convert header type for eth_subscribe

Due to custom header usage, only `eth_subscribe` method was returning the new header format in raw format, while other part were using RpcConvert to convert headers.

Make `eth_subscribe` newHeads to return the `inner` field (original eth header) instead.

src/addons/hl_node_compliance.rs

@@ -19,62 +19,23 @@ use alloy_rpc_types::{
     TransactionInfo,
     pubsub::{Params, SubscriptionKind},
 };
-use jsonrpsee::{PendingSubscriptionSink, SubscriptionMessage, SubscriptionSink, proc_macros::rpc};
+use jsonrpsee::{PendingSubscriptionSink, proc_macros::rpc};
 use jsonrpsee_core::{RpcResult, async_trait};
 use jsonrpsee_types::{ErrorObject, error::INTERNAL_ERROR_CODE};
 use reth::{api::FullNodeComponents, builder::rpc::RpcContext, tasks::TaskSpawner};
 use reth_primitives_traits::SignedTransaction;
 use reth_provider::{BlockIdReader, BlockReader, BlockReaderIdExt, ReceiptProvider};
-use reth_rpc::{EthFilter, EthPubSub, RpcTypes, eth::pubsub::SubscriptionSerializeError};
+use reth_rpc::{EthFilter, EthPubSub};
 use reth_rpc_eth_api::{
-    EthApiServer, EthApiTypes, EthFilterApiServer, EthPubSubApiServer, FullEthApiTypes, RpcBlock,
-    RpcConvert, RpcHeader, RpcNodeCoreExt, RpcReceipt, RpcTransaction, RpcTxReq,
-    helpers::{EthBlocks, EthTransactions, LoadReceipt},
-    transaction::ConvertReceiptInput,
+    EthApiTypes, EthFilterApiServer, EthPubSubApiServer, RpcBlock, RpcConvert, RpcReceipt,
+    RpcTransaction, helpers::EthBlocks, transaction::ConvertReceiptInput,
 };
 use reth_rpc_eth_types::EthApiError;
-use serde::Serialize;
 use std::{marker::PhantomData, sync::Arc};
-use tokio_stream::{Stream, StreamExt};
+use tokio_stream::StreamExt;
 use tracing::{Instrument, trace};
 
-use crate::{HlBlock, node::primitives::HlPrimitives};
-
-pub trait EthWrapper:
-    EthApiServer<
-        RpcTxReq<Self::NetworkTypes>,
-        RpcTransaction<Self::NetworkTypes>,
-        RpcBlock<Self::NetworkTypes>,
-        RpcReceipt<Self::NetworkTypes>,
-        RpcHeader<Self::NetworkTypes>,
-    > + FullEthApiTypes<
-        Primitives = HlPrimitives,
-        NetworkTypes: RpcTypes<TransactionResponse = alloy_rpc_types_eth::Transaction>,
-    > + RpcNodeCoreExt<Provider: BlockReader<Block = HlBlock>>
-    + EthBlocks
-    + EthTransactions
-    + LoadReceipt
-    + 'static
-{
-}
-
-impl<T> EthWrapper for T where
-    T: EthApiServer<
-            RpcTxReq<Self::NetworkTypes>,
-            RpcTransaction<Self::NetworkTypes>,
-            RpcBlock<Self::NetworkTypes>,
-            RpcReceipt<Self::NetworkTypes>,
-            RpcHeader<Self::NetworkTypes>,
-        > + FullEthApiTypes<
-            Primitives = HlPrimitives,
-            NetworkTypes: RpcTypes<TransactionResponse = alloy_rpc_types_eth::Transaction>,
-        > + RpcNodeCoreExt<Provider: BlockReader<Block = HlBlock>>
-        + EthBlocks
-        + EthTransactions
-        + LoadReceipt
-        + 'static
-{
-}
+use crate::addons::utils::{EthWrapper, new_headers_stream, pipe_from_stream};
 
 #[rpc(server, namespace = "eth")]
 #[async_trait]
@@ -387,7 +348,7 @@ where
                 )
                 .await;
             } else {
-                let _ = pubsub.handle_accepted(sink, kind, params).await;
+                let _ = pipe_from_stream(sink, new_headers_stream::<Eth>(&provider)).await;
             }
         }));
         Ok(())
@@ -412,23 +373,6 @@ fn adjust_log<Eth: EthWrapper>(mut log: Log, provider: &Eth::Provider) -> Option
     Some(log)
 }
 
-async fn pipe_from_stream<T: Serialize, St: Stream<Item = T> + Unpin>(
-    sink: SubscriptionSink,
-    mut stream: St,
-) -> Result<(), ErrorObject<'static>> {
-    loop {
-        tokio::select! {
-            _ = sink.closed() => break Ok(()),
-            maybe_item = stream.next() => {
-                let Some(item) = maybe_item else { break Ok(()) };
-                let msg = SubscriptionMessage::new(sink.method_name(), sink.subscription_id(), &item)
-                    .map_err(SubscriptionSerializeError::from)?;
-                if sink.send(msg).await.is_err() { break Ok(()); }
-            }
-        }
-    }
-}
-
 pub struct HlNodeBlockFilterHttp<Eth: EthWrapper> {
     eth_api: Arc<Eth>,
     _marker: PhantomData<Eth>,

src/addons/mod.rs

@@ -1,3 +1,5 @@
 pub mod call_forwarder;
 pub mod hl_node_compliance;
 pub mod tx_forwarder;
+pub mod subscribe_fixup;
+mod utils;

src/addons/subscribe_fixup.rs

@@ -0,0 +1,54 @@
+use crate::addons::utils::{EthWrapper, new_headers_stream, pipe_from_stream};
+use alloy_rpc_types::pubsub::{Params, SubscriptionKind};
+use async_trait::async_trait;
+use jsonrpsee::PendingSubscriptionSink;
+use jsonrpsee_types::ErrorObject;
+use reth::tasks::TaskSpawner;
+use reth_rpc::EthPubSub;
+use reth_rpc_convert::RpcTransaction;
+use reth_rpc_eth_api::{EthApiTypes, EthPubSubApiServer};
+use std::sync::Arc;
+
+pub struct SubscribeFixup<Eth: EthWrapper> {
+    pubsub: Arc<EthPubSub<Eth>>,
+    provider: Arc<Eth::Provider>,
+    subscription_task_spawner: Box<dyn TaskSpawner + 'static>,
+}
+
+#[async_trait]
+impl<Eth: EthWrapper> EthPubSubApiServer<RpcTransaction<Eth::NetworkTypes>> for SubscribeFixup<Eth>
+where
+    ErrorObject<'static>: From<<Eth as EthApiTypes>::Error>,
+{
+    async fn subscribe(
+        &self,
+        pending: PendingSubscriptionSink,
+        kind: SubscriptionKind,
+        params: Option<Params>,
+    ) -> jsonrpsee::core::SubscriptionResult {
+        let sink = pending.accept().await?;
+        let (pubsub, provider) = (self.pubsub.clone(), self.provider.clone());
+        self.subscription_task_spawner.spawn(Box::pin(async move {
+            if kind == SubscriptionKind::NewHeads {
+                let _ = pipe_from_stream(sink, new_headers_stream::<Eth>(&provider)).await;
+            } else {
+                let _ = pubsub.handle_accepted(sink, kind, params).await;
+            }
+        }));
+        Ok(())
+    }
+}
+
+impl<Eth: EthWrapper> SubscribeFixup<Eth> {
+    pub fn new(
+        pubsub: Arc<EthPubSub<Eth>>,
+        provider: Arc<Eth::Provider>,
+        subscription_task_spawner: Box<dyn TaskSpawner + 'static>,
+    ) -> Self
+    where
+        Eth: EthWrapper,
+        ErrorObject<'static>: From<Eth::Error>,
+    {
+        Self { pubsub, provider, subscription_task_spawner }
+    }
+}

src/addons/utils.rs

@@ -0,0 +1,90 @@
+use std::sync::Arc;
+
+use crate::{HlBlock, HlPrimitives};
+use alloy_primitives::U256;
+use alloy_rpc_types::Header;
+use futures::StreamExt;
+use jsonrpsee::{SubscriptionMessage, SubscriptionSink};
+use jsonrpsee_types::ErrorObject;
+use reth_primitives::SealedHeader;
+use reth_provider::{BlockReader, CanonStateSubscriptions};
+use reth_rpc::{RpcTypes, eth::pubsub::SubscriptionSerializeError};
+use reth_rpc_convert::{RpcBlock, RpcHeader, RpcReceipt, RpcTransaction, RpcTxReq};
+use reth_rpc_eth_api::{
+    EthApiServer, FullEthApiTypes, RpcNodeCoreExt,
+    helpers::{EthBlocks, EthTransactions, LoadReceipt},
+};
+use serde::Serialize;
+use tokio_stream::Stream;
+
+pub trait EthWrapper:
+    EthApiServer<
+        RpcTxReq<Self::NetworkTypes>,
+        RpcTransaction<Self::NetworkTypes>,
+        RpcBlock<Self::NetworkTypes>,
+        RpcReceipt<Self::NetworkTypes>,
+        RpcHeader<Self::NetworkTypes>,
+    > + FullEthApiTypes<
+        Primitives = HlPrimitives,
+        NetworkTypes: RpcTypes<TransactionResponse = alloy_rpc_types_eth::Transaction>,
+    > + RpcNodeCoreExt<Provider: BlockReader<Block = HlBlock>>
+    + EthBlocks
+    + EthTransactions
+    + LoadReceipt
+    + 'static
+{
+}
+
+impl<T> EthWrapper for T where
+    T: EthApiServer<
+            RpcTxReq<Self::NetworkTypes>,
+            RpcTransaction<Self::NetworkTypes>,
+            RpcBlock<Self::NetworkTypes>,
+            RpcReceipt<Self::NetworkTypes>,
+            RpcHeader<Self::NetworkTypes>,
+        > + FullEthApiTypes<
+            Primitives = HlPrimitives,
+            NetworkTypes: RpcTypes<TransactionResponse = alloy_rpc_types_eth::Transaction>,
+        > + RpcNodeCoreExt<Provider: BlockReader<Block = HlBlock>>
+        + EthBlocks
+        + EthTransactions
+        + LoadReceipt
+        + 'static
+{
+}
+
+pub(super) async fn pipe_from_stream<T: Serialize, St: Stream<Item = T> + Unpin>(
+    sink: SubscriptionSink,
+    mut stream: St,
+) -> Result<(), ErrorObject<'static>> {
+    loop {
+        tokio::select! {
+            _ = sink.closed() => break Ok(()),
+            maybe_item = stream.next() => {
+                let Some(item) = maybe_item else { break Ok(()) };
+                let msg = SubscriptionMessage::new(sink.method_name(), sink.subscription_id(), &item)
+                    .map_err(SubscriptionSerializeError::from)?;
+                if sink.send(msg).await.is_err() { break Ok(()); }
+            }
+        }
+    }
+}
+
+pub(super) fn new_headers_stream<Eth: EthWrapper>(
+    provider: &Arc<Eth::Provider>,
+) -> impl Stream<Item = Header<alloy_consensus::Header>> {
+    provider.canonical_state_stream().flat_map(|new_chain| {
+        let headers = new_chain
+            .committed()
+            .blocks_iter()
+            .map(|block| {
+                Header::from_consensus(
+                    SealedHeader::new(block.header().inner.clone(), block.hash()).into(),
+                    None,
+                    Some(U256::from(block.rlp_length())),
+                )
+            })
+            .collect::<Vec<_>>();
+        futures::stream::iter(headers)
+    })
+}

src/main.rs

@@ -1,12 +1,16 @@
 use std::sync::Arc;
 
 use clap::Parser;
-use reth::builder::{NodeBuilder, NodeHandle, WithLaunchContext};
+use reth::{
+    builder::{NodeBuilder, NodeHandle, WithLaunchContext},
+    rpc::{api::EthPubSubApiServer, eth::RpcNodeCore},
+};
 use reth_db::DatabaseEnv;
 use reth_hl::{
     addons::{
         call_forwarder::{self, CallForwarderApiServer},
         hl_node_compliance::install_hl_node_compliance,
+        subscribe_fixup::SubscribeFixup,
         tx_forwarder::{self, EthForwarderApiServer},
     },
     chainspec::{HlChainSpec, parser::HlChainSpecParser},
@@ -69,6 +73,17 @@ fn main() -> eyre::Result<()> {
                         info!("eth_getProof is disabled by default");
                     }
 
+                    // This is a temporary workaround to fix the issue with custom headers
+                    // affects `eth_subscribe[type=newHeads]`
+                    ctx.modules.replace_configured(
+                        SubscribeFixup::new(
+                            Arc::new(ctx.registry.eth_handlers().pubsub.clone()),
+                            Arc::new(ctx.registry.eth_api().provider().clone()),
+                            Box::new(ctx.node().task_executor.clone()),
+                        )
+                        .into_rpc(),
+                    )?;
+
                     ctx.modules.merge_configured(
                         HlBlockPrecompileExt::new(ctx.registry.eth_api().clone()).into_rpc(),
                     )?;