Polygon zkEVM节点代码解析

1. 引言

源代码：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：

序号	RPC接口名	以太坊	Hermez 2.0	备注
1	GetBlockByHash	√	√
2	GetBlockByNumber	√	√
3	GetBlockTransactionCountByHash	√	√
4	GetBlockTransactionCountByNumber	√	√
5	getUncleCountByBlockHash	√	√
6	getUncleCountByBlockNumber	√	√
7	ChainId	√	√
8	Syncing	√	√
9	Coinbase	√	X
10	Accounts	√	X
11	BlockNumber	√	√
12	Call	√	√
13	EstimateGas	√	√
14	CreateAccessList	√	X	EIP-2930：新交易类型，需以更贵的方式访问清单（地址或storage keys）外的内容。
15	GasPrice	√	√
16	MaxPriorityFeePerGas	√	X
17	FeeHistory	√	X
18	NewFilter	√	√
19	NewBlockFilter	√	√
20	NewPendingTransactionFilter	√	√
21	UninstallFilter	√	√
22	GetFilterChanges	√	√
23	GetFilterLogs	√	√
24	GetLogs	√	√
25	Mining	√	X
26	Hashrate	√	X
27	GetWork	√	X
28	SubmitWork	√	X
29	SubmitHashrate	√	X
30	Sign	√	X
31	SignTransaction	√	X
32	GetBalance	√	√
33	GetStorageAt	√	√
34	GetTransactionCount	√	√
35	GetCode	√	√
36	GetProof	√	X
37	SendTransaction	√	X
38	SendRawTransaction	√	√
39	GetTransactionByHash	√	√
40	GetTransactionByBlockHashAndIndex	√	√
41	GetTransactionByBlockNumberAndIndex	√	√
42	GetTransactionReceipt	√	√
43	GetCompilers	√	√
44	GetUncleByBlockHashAndIndex	√	√
45	GetUncleByBlockNumberAndIndex	√	√
46	ProtocolVersion	√	√

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)
}

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

转载：https://blog.csdn.net/mutourend/article/details/126409344