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：
| 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 | ✔️ | ❌ | |
| 10 | Accounts | ✔️ | ❌ | |
| 11 | BlockNumber | ✔️ | ✔️ | |
| 12 | Call | ✔️ | ✔️ | |
| 13 | EstimateGas | ✔️ | ✔️ | |
| 14 | CreateAccessList | ✔️ | ❌ | 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 | ✔️ | ❌ | |
| 17 | FeeHistory | ✔️ | ❌ | |
| 18 | NewFilter | ✔️ | ✔️ | |
| 19 | NewBlockFilter | ✔️ | ✔️ | |
| 20 | NewPendingTransactionFilter | ✔️ | ✔️ | |
| 21 | UninstallFilter | ✔️ | ✔️ | |
| 22 | GetFilterChanges | ✔️ | ✔️ | |
| 23 | GetFilterLogs | ✔️ | ✔️ | |
| 24 | GetLogs | ✔️ | ✔️ | |
| 25 | Mining | ✔️ | ❌ | |
| 26 | Hashrate | ✔️ | ❌ | |
| 27 | GetWork | ✔️ | ❌ | |
| 28 | SubmitWork | ✔️ | ❌ | |
| 29 | SubmitHashrate | ✔️ | ❌ | |
| 30 | Sign | ✔️ | ❌ | |
| 31 | SignTransaction | ✔️ | ❌ | |
| 32 | GetBalance | ✔️ | ✔️ | |
| 33 | GetStorageAt | ✔️ | ✔️ | |
| 34 | GetTransactionCount | ✔️ | ✔️ | |
| 35 | GetCode | ✔️ | ✔️ | |
| 36 | GetProof | ✔️ | ❌ | |
| 37 | SendTransaction | ✔️ | ❌ | |
| 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
