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Implement BlockProvider for block snapshotting
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| package replayer | ||
|
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||
| import ( | ||
| "fmt" | ||
|
|
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| "github.com/onflow/flow-evm-gateway/models" | ||
| "github.com/onflow/flow-evm-gateway/storage" | ||
| evmTypes "github.com/onflow/flow-go/fvm/evm/types" | ||
| flowGo "github.com/onflow/flow-go/model/flow" | ||
| gethCommon "github.com/onflow/go-ethereum/common" | ||
| "github.com/onflow/go-ethereum/eth/tracers" | ||
| ) | ||
|
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| type blockSnapshot struct { | ||
| *BlocksProvider | ||
| block models.Block | ||
| } | ||
|
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| var _ evmTypes.BlockSnapshot = (*blockSnapshot)(nil) | ||
|
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| func (bs *blockSnapshot) BlockContext() (evmTypes.BlockContext, error) { | ||
| return evmTypes.BlockContext{ | ||
| ChainID: evmTypes.EVMChainIDFromFlowChainID(bs.chainID), | ||
| BlockNumber: bs.block.Height, | ||
| BlockTimestamp: bs.block.Timestamp, | ||
| DirectCallBaseGasUsage: evmTypes.DefaultDirectCallBaseGasUsage, | ||
| DirectCallGasPrice: evmTypes.DefaultDirectCallGasPrice, | ||
| GasFeeCollector: evmTypes.CoinbaseAddress, | ||
| GetHashFunc: func(n uint64) gethCommon.Hash { | ||
| // For block heights greater than or equal to the current, | ||
| // return an empty block hash. | ||
| if n >= bs.block.Height { | ||
| return gethCommon.Hash{} | ||
| } | ||
| // If the given block height, is more than 256 blocks | ||
| // in the past, return an empty block hash. | ||
| if bs.block.Height-n > 256 { | ||
| return gethCommon.Hash{} | ||
| } | ||
|
|
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| block, err := bs.blocks.GetByHeight(n) | ||
| if err != nil { | ||
| return gethCommon.Hash{} | ||
| } | ||
| blockHash, err := block.Hash() | ||
| if err != nil { | ||
| return gethCommon.Hash{} | ||
| } | ||
|
|
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| return blockHash | ||
| }, | ||
| Random: bs.block.PrevRandao, | ||
| Tracer: bs.tracer, | ||
| }, nil | ||
| } | ||
|
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| type BlocksProvider struct { | ||
| blocks storage.BlockIndexer | ||
| chainID flowGo.ChainID | ||
| tracer *tracers.Tracer | ||
| latestBlock *models.Block | ||
| } | ||
|
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| var _ evmTypes.BlockSnapshotProvider = (*BlocksProvider)(nil) | ||
|
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| func NewBlocksProvider( | ||
| blocks storage.BlockIndexer, | ||
| chainID flowGo.ChainID, | ||
| tracer *tracers.Tracer, | ||
| ) *BlocksProvider { | ||
| return &BlocksProvider{ | ||
| blocks: blocks, | ||
| chainID: chainID, | ||
| tracer: tracer, | ||
| } | ||
| } | ||
|
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| func (bp *BlocksProvider) OnBlockReceived(block *models.Block) error { | ||
| if bp.latestBlock != nil && bp.latestBlock.Height != (block.Height-1) { | ||
| return fmt.Errorf( | ||
| "received new block: %d, non-sequential of latest block: %d", | ||
| block.Height, | ||
| bp.latestBlock.Height, | ||
| ) | ||
| } | ||
|
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| bp.latestBlock = block | ||
|
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| return nil | ||
| } | ||
|
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| func (bp *BlocksProvider) GetSnapshotAt(height uint64) ( | ||
| evmTypes.BlockSnapshot, | ||
| error, | ||
| ) { | ||
| if bp.latestBlock != nil && bp.latestBlock.Height == height { | ||
| return &blockSnapshot{ | ||
| BlocksProvider: bp, | ||
| block: *bp.latestBlock, | ||
| }, nil | ||
| } | ||
|
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| block, err := bp.blocks.GetByHeight(height) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &blockSnapshot{ | ||
| BlocksProvider: bp, | ||
| block: *block, | ||
| }, nil | ||
| } |
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