feature: add transaction forwarding #9
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WalkthroughThe changes add infrastructure for forwarding Ethereum raw transactions to an external sequencer via HTTP. This includes new configuration options, a transaction forwarding client with rate limiting and authentication, and an explicit RPC API wrapper that delegates most methods locally but forwards transaction submissions remotely. Dependencies and configuration files are reorganized and expanded to support these features. Changes
Sequence Diagram(s)sequenceDiagram
participant User
participant Node
participant EthApiForwarder
participant TxForwarder
participant Sequencer
User->>Node: sendRawTransaction(raw_tx)
Node->>EthApiForwarder: EthApiServer::send_raw_transaction(raw_tx)
EthApiForwarder->>TxForwarder: forward_raw(raw_tx)
TxForwarder->>Sequencer: POST / JSON-RPC eth_sendRawTransaction
Sequencer-->>TxForwarder: JSON-RPC response (tx hash or error)
TxForwarder-->>EthApiForwarder: Result<B256, ForwardError>
EthApiForwarder-->>Node: JSON-RPC response
Node-->>User: Transaction hash or error
Poem
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Summary of Changes
Hello @tac0turtle, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request introduces a significant new feature to the Lumen node: the ability to forward Ethereum transactions to an external sequencer. This functionality allows the node to integrate with external sequencing services, providing a flexible alternative to traditional local transaction pool processing and network gossip. The changes involve adding new configuration options, implementing a dedicated forwarding service, and integrating this service into the existing RPC API layer.
Highlights
- Transaction Forwarding Capability: Implemented a mechanism to forward raw RLP-encoded Ethereum transactions directly to an external sequencer via HTTP, enabling the node to act as a transaction relayer.
- Configurable Sequencer Endpoint: Added new command-line arguments (
--sequencer-http,--sequencer-auth,--disable-tx-pool-gossip) to thelumenbinary, allowing users to specify the sequencer's HTTP endpoint, authentication credentials, and an option to disable local transaction pool gossip when forwarding is active. - RPC API Integration: Introduced
EthApiForwarder, a wrapper around the existingEthApiServerimplementation. This forwarder interceptseth_sendRawTransactionandeth_sendRawTransactionSynccalls, redirecting them to the configured sequencer, while all other RPC methods continue to be handled by the local node. - Robust Transaction Submission: Developed
TxForwarderwith built-in features for rate-limiting, concurrency control, and metrics collection, ensuring reliable and observable transaction submission to the sequencer. - Dependency Updates: Updated
Cargo.lockandCargo.tomlto include new crates such asgovernor(for rate-limiting),jsonrpsee(for RPC client functionality),reqwest(for HTTP requests),metricsandprometheus(for observability), andwiremock(for testing), along with variousrethandalloycomponent updates.
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Code Review
This PR introduces transaction forwarding, enabling nodes to send transactions to a remote sequencer. I've identified potential panic issues in TxForwarder and suggested improvements for error propagation in EthApiForwarder. Overall, this is a valuable addition.
crates/node/src/eth_api_forwarder.rs
Outdated
| .map_err(|e| { | ||
| jsonrpsee::types::error::ErrorObject::owned( | ||
| jsonrpsee::types::error::INTERNAL_ERROR_CODE, | ||
| format!("Failed to forward transaction: {e}"), | ||
| None::<String>, | ||
| ) | ||
| }) |
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The error handling masks the original error from the remote RPC endpoint. Forward the original JSON-RPC error object when available to provide more context.
.map_err(|e| match e {
jsonrpsee::core::Error::Call(err) => err,
other => jsonrpsee::types::error::ErrorObject::owned(
jsonrpsee::types::error::INTERNAL_ERROR_CODE,
format!("Failed to forward transaction: {}", other),
None::<String>,
),
})| pub sequencer_http: Option<String>, | ||
| /// Optional Basic-Auth header | ||
| pub sequencer_auth: Option<String>, | ||
| /// Disable transaction pool gossip |
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Consider adding documentation to disable_tx_pool_gossip to explain its purpose and how it affects transaction handling.
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
|
/gemini review |
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Code Review
This PR introduces transaction forwarding to a sequencer, with a new TxForwarder and an EthApiForwarder to wrap the existing Eth RPC API. The review focuses on improving error handling in the RPC wrapper and reducing boilerplate code for better maintainability.
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>
|
marking this as r4r but we should test before merging |
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Actionable comments posted: 2
♻️ Duplicate comments (1)
crates/node/src/lib.rs (1)
33-34: Add documentation fordisable_tx_pool_gossipfield.This field lacks documentation explaining its purpose and impact on transaction handling.
/// Optional Basic-Auth header pub sequencer_auth: Option<String>, - /// Disable transaction pool gossip + /// Disable transaction pool gossip when forwarding to sequencer. + /// When enabled, prevents local mempool from gossiping forwarded transactions to peers. pub disable_tx_pool_gossip: bool,
🧹 Nitpick comments (3)
crates/node/src/forwarder.rs (3)
46-50: Document the non-zero requirement forrate_limit_per_sec.The constructor will panic if
rate_limit_per_secis 0. Consider adding this requirement to the documentation./// * `endpoint` – The sequencer endpoint (e.g. <http://localhost:8547>). /// * `queue_size` – Maximum number of in-flight requests (mapped onto a semaphore). - /// * `rate_limit_per_sec` – Maximum POST requests per second sent to the sequencer. + /// * `rate_limit_per_sec` – Maximum POST requests per second sent to the sequencer (must be > 0).
101-108: Consider adding a timeout for HTTP requests.Network requests to the sequencer could hang indefinitely. Consider adding a timeout to prevent resource exhaustion.
- let mut req = self.client.post(self.endpoint.clone()).json(&payload); + let mut req = self.client + .post(self.endpoint.clone()) + .timeout(std::time::Duration::from_secs(30)) + .json(&payload);
150-151: Remove or utilize the unusedRateLimitederror variant.The
RateLimitederror variant is defined but never used in the code. Either remove it or consider returning it when the rate limiter blocks requests.
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⛔ Files ignored due to path filters (1)
Cargo.lockis excluded by!**/*.lock
📒 Files selected for processing (6)
Cargo.toml(2 hunks)bin/lumen/src/main.rs(2 hunks)crates/node/Cargo.toml(1 hunks)crates/node/src/eth_api_forwarder.rs(1 hunks)crates/node/src/forwarder.rs(1 hunks)crates/node/src/lib.rs(1 hunks)
🧰 Additional context used
📓 Path-based instructions (2)
`crates/**/src/**/*.rs`: Unit tests should be written for individual components.
crates/**/src/**/*.rs: Unit tests should be written for individual components.
📄 Source: CodeRabbit Inference Engine (CLAUDE.md)
List of files the instruction was applied to:
crates/node/src/lib.rscrates/node/src/eth_api_forwarder.rscrates/node/src/forwarder.rs
`bin/lumen/src/main.rs`: The `RollkitEngineTypes` in `bin/lumen/src/main.rs` sho...
bin/lumen/src/main.rs: TheRollkitEngineTypesinbin/lumen/src/main.rsshould provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
TheRollkitEngineValidatorinbin/lumen/src/main.rsshould bypass certain checks for Rollkit compatibility while maintaining security and allowing flexible block production.
📄 Source: CodeRabbit Inference Engine (CLAUDE.md)
List of files the instruction was applied to:
bin/lumen/src/main.rs
🧠 Learnings (7)
📓 Common learnings
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
crates/node/src/lib.rs (4)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineValidator` in `bin/lumen/src/main.rs` should bypass certain checks for Rollkit compatibility while maintaining security and allowing flexible block production.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/tests/**/*.rs : Integration tests should be placed in `crates/tests/` and cover Engine API interactions, payload building with transactions, state execution validation, and Rollkit-specific scenarios.
bin/lumen/src/main.rs (5)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineValidator` in `bin/lumen/src/main.rs` should bypass certain checks for Rollkit compatibility while maintaining security and allowing flexible block production.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Run the node with defaults using `make run`, with debug logs using `make run-dev`, or directly via `./target/release/lumen node ...`.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/tests/**/*.rs : Integration tests should be placed in `crates/tests/` and cover Engine API interactions, payload building with transactions, state execution validation, and Rollkit-specific scenarios.
Cargo.toml (5)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineValidator` in `bin/lumen/src/main.rs` should bypass certain checks for Rollkit compatibility while maintaining security and allowing flexible block production.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/tests/**/*.rs : Integration tests should be placed in `crates/tests/` and cover Engine API interactions, payload building with transactions, state execution validation, and Rollkit-specific scenarios.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/**/src/**/*.rs : Unit tests should be written for individual components.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Test specific crates using `make test-node`, `make test-rollkit`, or `make test-common`.
crates/node/src/eth_api_forwarder.rs (3)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/tests/**/*.rs : Integration tests should be placed in `crates/tests/` and cover Engine API interactions, payload building with transactions, state execution validation, and Rollkit-specific scenarios.
crates/node/Cargo.toml (7)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Run the node with defaults using `make run`, with debug logs using `make run-dev`, or directly via `./target/release/lumen node ...`.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineValidator` in `bin/lumen/src/main.rs` should bypass certain checks for Rollkit compatibility while maintaining security and allowing flexible block production.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Maintain a modular workspace structure to separate concerns between general node logic and Rollkit-specific features.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Test specific crates using `make test-node`, `make test-rollkit`, or `make test-common`.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/tests/**/*.rs : Integration tests should be placed in `crates/tests/` and cover Engine API interactions, payload building with transactions, state execution validation, and Rollkit-specific scenarios.
crates/node/src/forwarder.rs (4)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineValidator` in `bin/lumen/src/main.rs` should bypass certain checks for Rollkit compatibility while maintaining security and allowing flexible block production.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/tests/**/*.rs : Integration tests should be placed in `crates/tests/` and cover Engine API interactions, payload building with transactions, state execution validation, and Rollkit-specific scenarios.
🔇 Additional comments (6)
crates/node/Cargo.toml (1)
77-86: LGTM! Dependencies align with forwarding feature requirements.The added dependencies appropriately support the transaction forwarding implementation:
reqwestfor HTTP client functionalitygovernorfor rate limitingreth-metricsfor instrumentationwiremockfor testing the forwarding logicbin/lumen/src/main.rs (1)
74-99: Well-structured CLI arguments for transaction forwarding.The new arguments properly support the forwarding feature with:
- Clear help text and value names
- Environment variable support for sensitive auth data
- Appropriate default values
Cargo.toml (1)
1-128: Clean workspace manifest reorganization.The alphabetization and consistent formatting improve maintainability. The new dependencies appropriately support the transaction forwarding features.
crates/node/src/eth_api_forwarder.rs (3)
130-135: Verify intended behavior forsend_transaction.The
send_transactionmethod delegates to the inner implementation rather than forwarding to the remote sequencer. This allows local signing before the transaction is forwarded as a raw transaction. Please confirm this is the intended flow for transaction submission.
137-165: Error handling properly preserves remote errors.The implementation correctly addresses past review feedback by preserving the original error objects from the remote sequencer, providing better error context to clients.
151-165: Verifyeth_sendRawTransactionSyncimplementation in remote endpoint
The method simply forwards to"eth_sendRawTransactionSync"and assumes the remote node will return the receipt typeR. Since this is a custom (non-standard) RPC provided by reth-rpc-api v1.5.x + Alloy 0.7, please confirm:
- That
eth_sendRawTransactionSyncis actually defined in your RPC trait (e.g., in reth-rpc-api)- That the target node you’re forwarding to supports this endpoint and returns the expected receipt structure
R
| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
| use tokio; | ||
| use wiremock::{ | ||
| matchers::{method, path}, | ||
| Mock, MockServer, ResponseTemplate, | ||
| }; | ||
|
|
||
| #[tokio::test] | ||
| async fn happy_path() { | ||
| // Spin up a mock sequencer. | ||
| let server = MockServer::start().await; | ||
|
|
||
| // Mock 200 OK with a zero tx-hash. | ||
| let body = serde_json::json!({ | ||
| "jsonrpc": "2.0", | ||
| "id": 1, | ||
| "result": format!("0x{}", "00".repeat(32)) | ||
| }); | ||
| Mock::given(method("POST")) | ||
| .and(path("/")) | ||
| .respond_with(ResponseTemplate::new(200).set_body_json(body)) | ||
| .mount(&server) | ||
| .await; | ||
|
|
||
| let forwarder = TxForwarder::new( | ||
| server.uri().parse().unwrap(), | ||
| /*queue_size*/ 10, | ||
| /*rate_limit*/ 1_000, | ||
| /*auth*/ None, | ||
| None, | ||
| ); | ||
|
|
||
| let hash = forwarder | ||
| .forward_raw(Bytes::from_static(b"\x01\x02")) | ||
| .await | ||
| .expect("forwarding should succeed"); | ||
|
|
||
| assert_eq!(hash, B256::ZERO); | ||
| } | ||
|
|
||
| #[tokio::test] | ||
| async fn http_error() { | ||
| let server = MockServer::start().await; | ||
|
|
||
| // Mock 500 Internal Server Error. | ||
| Mock::given(method("POST")) | ||
| .and(path("/")) | ||
| .respond_with(ResponseTemplate::new(500)) | ||
| .mount(&server) | ||
| .await; | ||
|
|
||
| let forwarder = TxForwarder::new(server.uri().parse().unwrap(), 10, 1_000, None, None); | ||
|
|
||
| let err = forwarder | ||
| .forward_raw(Bytes::from_static(b"\x03\x04")) | ||
| .await | ||
| .expect_err("should return error"); | ||
|
|
||
| matches!(err, ForwardError::HttpStatus(status) if status == reqwest::StatusCode::INTERNAL_SERVER_ERROR); | ||
| } | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Expand test coverage for comprehensive testing.
Per the coding guidelines, unit tests should be written for individual components. Consider adding tests for:
- Authentication header handling
- Invalid JSON responses
- Invalid transaction hash responses
- Upstream JSON-RPC errors
- Concurrent request handling (queue behavior)
Would you like me to generate additional test cases to improve coverage?
🤖 Prompt for AI Agents
In crates/node/src/forwarder.rs between lines 172 and 234, the existing tests
cover basic success and HTTP error scenarios but lack coverage for
authentication headers, invalid JSON responses, invalid transaction hash
responses, upstream JSON-RPC errors, and concurrent request handling. To fix
this, add new unit tests that specifically verify the correct inclusion and
handling of authentication headers, simulate and assert behavior on invalid JSON
and transaction hash responses, test how upstream JSON-RPC errors are handled,
and create tests that send multiple concurrent requests to validate queue
behavior and rate limiting.
There was a problem hiding this comment.
Actionable comments posted: 1
🧹 Nitpick comments (1)
crates/node/src/eth_api_forwarder.rs (1)
1-6: Consider addressing clippy warnings instead of suppressing them.Suppressing warnings can hide code quality issues. Consider:
- Using lifetime elision where possible
- Breaking down complex types into type aliases
- Refactoring functions with many arguments into builder patterns or structs
- Using
if letfor single-arm matches
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (1)
crates/node/src/eth_api_forwarder.rs(1 hunks)
🧰 Additional context used
📓 Path-based instructions (1)
`crates/**/src/**/*.rs`: Unit tests should be written for individual components.
crates/**/src/**/*.rs: Unit tests should be written for individual components.
📄 Source: CodeRabbit Inference Engine (CLAUDE.md)
List of files the instruction was applied to:
crates/node/src/eth_api_forwarder.rs
🧠 Learnings (2)
📓 Common learnings
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
crates/node/src/eth_api_forwarder.rs (2)
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to crates/node/src/builder.rs : The `RollkitPayloadBuilder` in `crates/node/src/builder.rs` should accept transactions from Engine API payload attributes, execute transactions, build blocks, and manage state transitions.
Learnt from: CR
PR: rollkit/lumen#0
File: CLAUDE.md:0-0
Timestamp: 2025-06-30T15:38:11.650Z
Learning: Applies to bin/lumen/src/main.rs : The `RollkitEngineTypes` in `bin/lumen/src/main.rs` should provide custom Engine API types supporting transaction submission and handle payload attribute validation and processing.
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🔇 Additional comments (3)
crates/node/src/eth_api_forwarder.rs (3)
30-48: LGTM!Clean struct design with appropriate use of
Arcfor thread-safe access to the remote client.
50-106: LGTM!Standard delegation pattern correctly implemented for all required traits.
122-127: LGTM!Correct delegation pattern for transaction signing before forwarding.
| .await | ||
| } | ||
| async fn call_many( | ||
| &self, | ||
| bundles: Vec<Bundle>, | ||
| state_context: Option<StateContext>, | ||
| state_override: Option<StateOverride>, | ||
| ) -> RpcResult<Vec<Vec<EthCallResponse>>> { | ||
| self.inner | ||
| .call_many(bundles, state_context, state_override) | ||
| .await | ||
| } | ||
| async fn create_access_list( | ||
| &self, | ||
| request: TransactionRequest, | ||
| block_number: Option<BlockId>, | ||
| state_override: Option<StateOverride>, | ||
| ) -> RpcResult<AccessListResult> { | ||
| self.inner | ||
| .create_access_list(request, block_number, state_override) | ||
| .await | ||
| } | ||
| async fn estimate_gas( | ||
| &self, | ||
| request: TransactionRequest, | ||
| block_number: Option<BlockId>, | ||
| state_override: Option<StateOverride>, | ||
| ) -> RpcResult<U256> { | ||
| self.inner | ||
| .estimate_gas(request, block_number, state_override) | ||
| .await | ||
| } | ||
| async fn gas_price(&self) -> RpcResult<U256> { | ||
| self.inner.gas_price().await | ||
| } | ||
| async fn get_account(&self, addr: Address, block: BlockId) -> RpcResult<Option<Account>> { | ||
| self.inner.get_account(addr, block).await | ||
| } | ||
| async fn max_priority_fee_per_gas(&self) -> RpcResult<U256> { | ||
| self.inner.max_priority_fee_per_gas().await | ||
| } | ||
| async fn blob_base_fee(&self) -> RpcResult<U256> { | ||
| self.inner.blob_base_fee().await | ||
| } | ||
| async fn fee_history( | ||
| &self, | ||
| block_count: U64, | ||
| newest: BlockNumberOrTag, | ||
| reward_percentiles: Option<Vec<f64>>, | ||
| ) -> RpcResult<FeeHistory> { | ||
| self.inner | ||
| .fee_history(block_count, newest, reward_percentiles) | ||
| .await | ||
| } | ||
|
|
||
| // ---------- mining / hashrate -------------------------------------------- | ||
| async fn is_mining(&self) -> RpcResult<bool> { | ||
| self.inner.is_mining().await | ||
| } | ||
| async fn hashrate(&self) -> RpcResult<U256> { | ||
| self.inner.hashrate().await | ||
| } | ||
| async fn get_work(&self) -> RpcResult<Work> { | ||
| self.inner.get_work().await | ||
| } | ||
| async fn submit_hashrate(&self, hashrate: U256, id: B256) -> RpcResult<bool> { | ||
| self.inner.submit_hashrate(hashrate, id).await | ||
| } | ||
| async fn submit_work(&self, nonce: B64, pow_hash: B256, mix_digest: B256) -> RpcResult<bool> { | ||
| self.inner.submit_work(nonce, pow_hash, mix_digest).await | ||
| } | ||
|
|
||
| // ---------- signing ------------------------------------------------------- | ||
| async fn sign(&self, addr: Address, data: Bytes) -> RpcResult<Bytes> { | ||
| self.inner.sign(addr, data).await | ||
| } | ||
| async fn sign_transaction(&self, transaction: TransactionRequest) -> RpcResult<Bytes> { | ||
| self.inner.sign_transaction(transaction).await | ||
| } | ||
| async fn sign_typed_data( | ||
| &self, | ||
| addr: Address, | ||
| data: alloy_dyn_abi::TypedData, | ||
| ) -> RpcResult<Bytes> { | ||
| self.inner.sign_typed_data(addr, data).await | ||
| } | ||
|
|
||
| // ---------- proofs -------------------------------------------------------- | ||
| async fn get_proof( | ||
| &self, | ||
| addr: Address, | ||
| keys: Vec<JsonStorageKey>, | ||
| at: Option<BlockId>, | ||
| ) -> RpcResult<EIP1186AccountProofResponse> { | ||
| self.inner.get_proof(addr, keys, at).await | ||
| } | ||
| async fn get_account_info(&self, addr: Address, at: BlockId) -> RpcResult<AccountInfo> { | ||
| self.inner.get_account_info(addr, at).await | ||
| } | ||
| } |
There was a problem hiding this comment.
🛠️ Refactor suggestion
Add unit tests for the EthApiForwarder.
According to the coding guidelines, unit tests should be written for components in crates/**/src/**/*.rs. The forwarder's transaction forwarding logic and error handling would benefit from test coverage.
Consider testing:
- Error handling when remote client returns different error types
- Correct delegation of methods to inner vs remote
- Concurrent access to the shared HttpClient
Would you like me to generate unit tests for the EthApiForwarder?
🤖 Prompt for AI Agents
In crates/node/src/eth_api_forwarder.rs covering the entire EthApiForwarder
implementation, add unit tests to verify the transaction forwarding logic and
error handling. Write tests that simulate the remote HttpClient returning
various error types to ensure proper error mapping. Also, test that methods
correctly delegate to either the inner implementation or the remote client as
intended. Include concurrency tests to validate safe shared access to the
Arc-wrapped HttpClient. Use mocking for the inner EthApiServer and HttpClient to
isolate and verify behavior.
Description
This Pr allows nodes to forward txs to the sequencer if set.
ref rollkit/rollkit#2390
Type of Change
Related Issues
Fixes #(issue)
Checklist
Testing
Additional Notes
Summary by CodeRabbit
New Features
Bug Fixes
Chores