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) error
	GetPendingTxs(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 estimator
type 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.ExecutionResult
	IsL2BlockConsolidated(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) error
	UninstallFilter(filterID uint64) (bool, error)
}
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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