feat(rpc): created EthApiBuilder type (#14041)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>

crates/rpc/rpc/src/eth/builder.rs

@@ -0,0 +1,189 @@
+//! `EthApiBuilder` implementation
+
+use crate::{
+    eth::{core::EthApiInner, EthTxBuilder},
+    EthApi,
+};
+use reth_provider::{BlockReaderIdExt, StateProviderFactory};
+use reth_rpc_eth_types::{EthStateCache, FeeHistoryCache, GasCap, GasPriceOracle};
+use reth_rpc_server_types::constants::{
+    DEFAULT_ETH_PROOF_WINDOW, DEFAULT_MAX_SIMULATE_BLOCKS, DEFAULT_PROOF_PERMITS,
+};
+use reth_tasks::{pool::BlockingTaskPool, TaskSpawner, TokioTaskExecutor};
+use std::sync::Arc;
+
+/// A helper to build the `EthApi` handler instance.
+///
+/// This builder type contains all settings to create an [`EthApiInner`] or an [`EthApi`] instance
+/// directly.
+#[derive(Debug)]
+pub struct EthApiBuilder<Provider, Pool, Network, EvmConfig>
+where
+    Provider: BlockReaderIdExt,
+{
+    provider: Provider,
+    pool: Pool,
+    network: Network,
+    evm_config: EvmConfig,
+    gas_cap: GasCap,
+    max_simulate_blocks: u64,
+    eth_proof_window: u64,
+    fee_history_cache: FeeHistoryCache,
+    proof_permits: usize,
+    eth_cache: Option<EthStateCache<Provider::Block, Provider::Receipt>>,
+    gas_oracle: Option<GasPriceOracle<Provider>>,
+    blocking_task_pool: Option<BlockingTaskPool>,
+    task_spawner: Box<dyn TaskSpawner + 'static>,
+}
+
+impl<Provider, Pool, Network, EvmConfig> EthApiBuilder<Provider, Pool, Network, EvmConfig>
+where
+    Provider: BlockReaderIdExt,
+{
+    /// Creates a new `EthApiBuilder` instance.
+    pub fn new(provider: Provider, pool: Pool, network: Network, evm_config: EvmConfig) -> Self
+    where
+        Provider: BlockReaderIdExt,
+    {
+        Self {
+            provider,
+            pool,
+            network,
+            evm_config,
+            eth_cache: None,
+            gas_oracle: None,
+            gas_cap: GasCap::default(),
+            max_simulate_blocks: DEFAULT_MAX_SIMULATE_BLOCKS,
+            eth_proof_window: DEFAULT_ETH_PROOF_WINDOW,
+            blocking_task_pool: None,
+            fee_history_cache: FeeHistoryCache::new(Default::default()),
+            proof_permits: DEFAULT_PROOF_PERMITS,
+            task_spawner: TokioTaskExecutor::default().boxed(),
+        }
+    }
+
+    /// Configures the task spawner used to spawn additional tasks.
+    pub fn task_spawner(mut self, spawner: impl TaskSpawner + 'static) -> Self {
+        self.task_spawner = Box::new(spawner);
+        self
+    }
+
+    /// Sets `eth_cache` instance
+    pub fn eth_cache(
+        mut self,
+        eth_cache: EthStateCache<Provider::Block, Provider::Receipt>,
+    ) -> Self {
+        self.eth_cache = Some(eth_cache);
+        self
+    }
+
+    /// Sets `gas_oracle` instance
+    pub fn gas_oracle(mut self, gas_oracle: GasPriceOracle<Provider>) -> Self {
+        self.gas_oracle = Some(gas_oracle);
+        self
+    }
+
+    /// Sets the gas cap.
+    pub const fn gas_cap(mut self, gas_cap: GasCap) -> Self {
+        self.gas_cap = gas_cap;
+        self
+    }
+
+    /// Sets the maximum number of blocks for `eth_simulateV1`.
+    pub const fn max_simulate_blocks(mut self, max_simulate_blocks: u64) -> Self {
+        self.max_simulate_blocks = max_simulate_blocks;
+        self
+    }
+
+    /// Sets the maximum number of blocks into the past for generating state proofs.
+    pub const fn eth_proof_window(mut self, eth_proof_window: u64) -> Self {
+        self.eth_proof_window = eth_proof_window;
+        self
+    }
+
+    /// Sets the blocking task pool.
+    pub fn blocking_task_pool(mut self, blocking_task_pool: BlockingTaskPool) -> Self {
+        self.blocking_task_pool = Some(blocking_task_pool);
+        self
+    }
+
+    /// Sets the fee history cache.
+    pub fn fee_history_cache(mut self, fee_history_cache: FeeHistoryCache) -> Self {
+        self.fee_history_cache = fee_history_cache;
+        self
+    }
+
+    /// Sets the proof permits.
+    pub const fn proof_permits(mut self, proof_permits: usize) -> Self {
+        self.proof_permits = proof_permits;
+        self
+    }
+
+    /// Builds the [`EthApiInner`] instance.
+    ///
+    /// If not configured, this will spawn the cache backend: [`EthStateCache::spawn`].
+    ///
+    /// # Panics
+    ///
+    /// This function panics if the blocking task pool cannot be built.
+    /// This will panic if called outside the context of a Tokio runtime.
+    pub fn build_inner(self) -> EthApiInner<Provider, Pool, Network, EvmConfig>
+    where
+        Provider: BlockReaderIdExt + StateProviderFactory + Clone + Unpin + 'static,
+    {
+        let Self {
+            provider,
+            pool,
+            network,
+            evm_config,
+            eth_cache,
+            gas_oracle,
+            gas_cap,
+            max_simulate_blocks,
+            eth_proof_window,
+            blocking_task_pool,
+            fee_history_cache,
+            proof_permits,
+            task_spawner,
+        } = self;
+
+        let eth_cache =
+            eth_cache.unwrap_or_else(|| EthStateCache::spawn(provider.clone(), Default::default()));
+        let gas_oracle = gas_oracle.unwrap_or_else(|| {
+            GasPriceOracle::new(provider.clone(), Default::default(), eth_cache.clone())
+        });
+
+        EthApiInner::new(
+            provider,
+            pool,
+            network,
+            eth_cache,
+            gas_oracle,
+            gas_cap,
+            max_simulate_blocks,
+            eth_proof_window,
+            blocking_task_pool.unwrap_or_else(|| {
+                BlockingTaskPool::build().expect("failed to build blocking task pool")
+            }),
+            fee_history_cache,
+            evm_config,
+            task_spawner,
+            proof_permits,
+        )
+    }
+
+    /// Builds the [`EthApi`] instance.
+    ///
+    /// If not configured, this will spawn the cache backend: [`EthStateCache::spawn`].
+    ///
+    /// # Panics
+    ///
+    /// This function panics if the blocking task pool cannot be built.
+    /// This will panic if called outside the context of a Tokio runtime.
+    pub fn build(self) -> EthApi<Provider, Pool, Network, EvmConfig>
+    where
+        Provider: BlockReaderIdExt + StateProviderFactory + Clone + Unpin + 'static,
+    {
+        EthApi { inner: Arc::new(self.build_inner()), tx_resp_builder: EthTxBuilder }
+    }
+}

crates/rpc/rpc/src/eth/core.rs

@@ -3,6 +3,7 @@
 
 use std::sync::Arc;
 
+use crate::{eth::EthTxBuilder, EthApiBuilder};
 use alloy_consensus::BlockHeader;
 use alloy_eips::BlockNumberOrTag;
 use alloy_network::Ethereum;
@@ -28,8 +29,6 @@ use reth_tasks::{
 };
 use tokio::sync::{broadcast, Mutex};
 
-use crate::eth::EthTxBuilder;
-
 const DEFAULT_BROADCAST_CAPACITY: usize = 2000;
 
 /// `Eth` API implementation.
@@ -63,6 +62,16 @@ impl<Provider, Pool, Network, EvmConfig> EthApi<Provider, Pool, Network, EvmConf
 where
     Provider: BlockReaderIdExt,
 {
+    /// Convenience fn to obtain a new [`EthApiBuilder`] instance with mandatory components
+    pub fn builder(
+        provider: Provider,
+        pool: Pool,
+        network: Network,
+        evm_config: EvmConfig,
+    ) -> EthApiBuilder<Provider, Pool, Network, EvmConfig> {
+        EthApiBuilder::new(provider, pool, network, evm_config)
+    }
+
     /// Creates a new, shareable instance using the default tokio task spawner.
     #[allow(clippy::too_many_arguments)]
     pub fn new(
@@ -91,7 +100,7 @@ where
             blocking_task_pool,
             fee_history_cache,
             evm_config,
-            TokioTaskExecutor::default(),
+            TokioTaskExecutor::default().boxed(),
             proof_permits,
         );
 
@@ -133,7 +142,7 @@ where
             blocking_task_pool,
             ctx.new_fee_history_cache(),
             ctx.evm_config.clone(),
-            ctx.executor.clone(),
+            Box::new(ctx.executor.clone()),
             ctx.config.proof_permits,
         );
 
@@ -294,7 +303,7 @@ where
         blocking_task_pool: BlockingTaskPool,
         fee_history_cache: FeeHistoryCache,
         evm_config: EvmConfig,
-        task_spawner: impl TaskSpawner + 'static,
+        task_spawner: Box<dyn TaskSpawner + 'static>,
         proof_permits: usize,
     ) -> Self {
         let signers = parking_lot::RwLock::new(Default::default());
@@ -321,7 +330,7 @@ where
             max_simulate_blocks,
             eth_proof_window,
             starting_block,
-            task_spawner: Box::new(task_spawner),
+            task_spawner,
             pending_block: Default::default(),
             blocking_task_pool,
             fee_history_cache,
@@ -451,7 +460,7 @@ where
 
 #[cfg(test)]
 mod tests {
-    use crate::EthApi;
+    use crate::{EthApi, EthApiBuilder};
     use alloy_consensus::Header;
     use alloy_eips::BlockNumberOrTag;
     use alloy_primitives::{PrimitiveSignature as Signature, B256, U64};
@@ -466,13 +475,6 @@ mod tests {
         BlockReader, BlockReaderIdExt, ChainSpecProvider, StateProviderFactory,
     };
     use reth_rpc_eth_api::EthApiServer;
-    use reth_rpc_eth_types::{
-        EthStateCache, FeeHistoryCache, FeeHistoryCacheConfig, GasCap, GasPriceOracle,
-    };
-    use reth_rpc_server_types::constants::{
-        DEFAULT_ETH_PROOF_WINDOW, DEFAULT_MAX_SIMULATE_BLOCKS, DEFAULT_PROOF_PERMITS,
-    };
-    use reth_tasks::pool::BlockingTaskPool;
     use reth_testing_utils::{generators, generators::Rng};
     use reth_transaction_pool::test_utils::{testing_pool, TestPool};
 
@@ -490,24 +492,13 @@ mod tests {
     >(
         provider: P,
     ) -> EthApi<P, TestPool, NoopNetwork, EthEvmConfig> {
-        let evm_config = EthEvmConfig::new(provider.chain_spec());
-        let cache = EthStateCache::spawn(provider.clone(), Default::default());
-        let fee_history_cache = FeeHistoryCache::new(FeeHistoryCacheConfig::default());
-
-        EthApi::new(
+        EthApiBuilder::new(
             provider.clone(),
             testing_pool(),
             NoopNetwork::default(),
-            cache.clone(),
-            GasPriceOracle::new(provider, Default::default(), cache),
-            GasCap::default(),
-            DEFAULT_MAX_SIMULATE_BLOCKS,
-            DEFAULT_ETH_PROOF_WINDOW,
-            BlockingTaskPool::build().expect("failed to build tracing pool"),
-            fee_history_cache,
-            evm_config,
-            DEFAULT_PROOF_PERMITS,
+            EthEvmConfig::new(provider.chain_spec()),
         )
+        .build()
     }
 
     // Function to prepare the EthApi with mock data

crates/rpc/rpc/src/eth/mod.rs

@@ -1,5 +1,6 @@
 //! Sever implementation of `eth` namespace API.
 
+pub mod builder;
 pub mod bundle;
 pub mod core;
 pub mod filter;
@@ -8,6 +9,7 @@ pub mod pubsub;
 pub mod sim_bundle;
 
 /// Implementation of `eth` namespace API.
+pub use builder::EthApiBuilder;
 pub use bundle::EthBundle;
 pub use core::EthApi;
 pub use filter::EthFilter;

crates/rpc/rpc/src/lib.rs

@@ -49,7 +49,7 @@ mod web3;
 pub use admin::AdminApi;
 pub use debug::DebugApi;
 pub use engine::{EngineApi, EngineEthApi};
-pub use eth::{EthApi, EthBundle, EthFilter, EthPubSub};
+pub use eth::{EthApi, EthApiBuilder, EthBundle, EthFilter, EthPubSub};
 pub use miner::MinerApi;
 pub use net::NetApi;
 pub use otterscan::OtterscanApi;