Polygon zkEVM节点代码解析

1. 引言

前序博客：

• Polygon zkEVM网络节点

相关代码：

• https://github.com/0xPolygonHermez/zkevm-node（Go语言）

Polygon zkEVM节点提供的主要服务模块有：

• 1）JSON-RPC服务
• 2）Sequencer服务
• 3）Aggregator服务
• 4）Synchronizer服务
• 5）Broadcast服务

2. JSON-RPC服务

以太坊JSON-RPC接口 与 Polygon zkEVM中的JSON-RPC接口 对比情况为：

Hermez 2.0（zkEVM）除实现了以上与以太坊兼容的RPC接口之外，还额外实现了一些与state交互、与pool交互的接口：

// jsonRPCTxPool contains the methods required to interact with the tx pool.type jsonRPCTxPool interface {AddTx(ctx context.Context, tx types.Transaction) errorGetPendingTxs(ctx context.Context, isClaims bool, limit uint64) ([]pool.Transaction, error)GetGasPrice(ctx context.Context) (uint64, error)GetPendingTxHashesSince(ctx context.Context, since time.Time) ([]common.Hash, error)}// gasPriceEstimator contains the methods required to interact with gas price estimatortype gasPriceEstimator interface {GetAvgGasPrice(ctx context.Context) (*big.Int, error)}// stateInterface gathers the methods required to interact with the state.type stateInterface interface {BeginStateTransaction(ctx context.Context) (pgx.Tx, error)GetLastConsolidatedL2BlockNumber(ctx context.Context, dbTx pgx.Tx) (uint64, error)GetTransactionByHash(ctx context.Context, transactionHash common.Hash, dbTx pgx.Tx) (*types.Transaction, error)GetTransactionReceipt(ctx context.Context, transactionHash common.Hash, dbTx pgx.Tx) (*types.Receipt, error)GetLastL2BlockNumber(ctx context.Context, dbTx pgx.Tx) (uint64, error)GetLastL2Block(ctx context.Context, dbTx pgx.Tx) (*types.Block, error)GetLastL2BlockHeader(ctx context.Context, dbTx pgx.Tx) (*types.Header, error)EstimateGas(transaction *types.Transaction, senderAddress common.Address) (uint64, error)GetBalance(ctx context.Context, address common.Address, blockNumber uint64, dbTx pgx.Tx) (*big.Int, error)GetL2BlockByHash(ctx context.Context, hash common.Hash, dbTx pgx.Tx) (*types.Block, error)GetL2BlockByNumber(ctx context.Context, blockNumber uint64, dbTx pgx.Tx) (*types.Block, error)GetCode(ctx context.Context, address common.Address, blockNumber uint64, dbTx pgx.Tx) ([]byte, error)GetStorageAt(ctx context.Context, address common.Address, position *big.Int, blockNumber uint64, dbTx pgx.Tx) (*big.Int, error)GetSyncingInfo(ctx context.Context, dbTx pgx.Tx) (state.SyncingInfo, error)GetTransactionByL2BlockHashAndIndex(ctx context.Context, blockHash common.Hash, index uint64, dbTx pgx.Tx) (*types.Transaction, error)GetTransactionByL2BlockNumberAndIndex(ctx context.Context, blockNumber uint64, index uint64, dbTx pgx.Tx) (*types.Transaction, error)GetNonce(ctx context.Context, address common.Address, blockNumber uint64, dbTx pgx.Tx) (uint64, error)GetL2BlockHeaderByNumber(ctx context.Context, blockNumber uint64, dbTx pgx.Tx) (*types.Header, error)GetL2BlockTransactionCountByHash(ctx context.Context, hash common.Hash, dbTx pgx.Tx) (uint64, error)GetL2BlockTransactionCountByNumber(ctx context.Context, blockNumber uint64, dbTx pgx.Tx) (uint64, error)GetLogs(ctx context.Context, fromBlock uint64, toBlock uint64, addresses []common.Address, topics [][]common.Hash, blockHash *common.Hash, since *time.Time, dbTx pgx.Tx) ([]*types.Log, error)GetL2BlockHashesSince(ctx context.Context, since time.Time, dbTx pgx.Tx) ([]common.Hash, error)DebugTransaction(ctx context.Context, transactionHash common.Hash, tracer string) (*runtime.ExecutionResult, error)ProcessUnsignedTransaction(ctx context.Context, tx *types.Transaction, senderAddress common.Address, blockNumber uint64, dbTx pgx.Tx) *runtime.ExecutionResultIsL2BlockConsolidated(ctx context.Context, blockNumber int, dbTx pgx.Tx) (bool, error)IsL2BlockVirtualized(ctx context.Context, blockNumber int, dbTx pgx.Tx) (bool, error)}type storageInterface interface {NewLogFilter(filter LogFilter) (uint64, error)NewBlockFilter() (uint64, error)NewPendingTransactionFilter() (uint64, error)GetFilter(filterID uint64) (*Filter, error)UpdateFilterLastPoll(filterID uint64) errorUninstallFilter(filterID uint64) (bool, error)}

3. Sequencer服务

当前代码库中，暂未实现permissionless sequencer功能，ProofOfEfficiency.sol合约中也暂未实现registerSequencer等接口。

参考资料

[1] Ethereum JSON-RPC Specification
[2] PoE
[3] zkProver debugging
[4] Hermez 1.5 – Merkle Tree spec
[5] PoE – 1.5

附录：Polygon Hermez 2.0 zkEVM系列博客

• ZK-Rollups工作原理
• Polygon zkEVM——Hermez 2.0简介
• Polygon zkEVM网络节点
• Polygon zkEVM 基本概念
• Polygon zkEVM Prover
• Polygon zkEVM工具——PIL和CIRCOM