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Merge pull request #6544 from onflow/ramtin/evm-offchain-part1
[EVM] Offchain package - part 1
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| package blocks | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| gethCommon "github.com/onflow/go-ethereum/common" | ||
|
|
||
| "github.com/onflow/flow-go/fvm/evm/handler" | ||
| "github.com/onflow/flow-go/fvm/evm/types" | ||
| "github.com/onflow/flow-go/model/flow" | ||
| ) | ||
|
|
||
| const BlockStoreLatestBlockMetaKey = "LatestBlockMeta" | ||
|
|
||
| // Blocks facilitates access to the recent block hash values | ||
| // and also the latest executed block meta data | ||
| type Blocks struct { | ||
| chainID flow.ChainID | ||
| storage types.BackendStorage | ||
| rootAddress flow.Address | ||
| bhl *handler.BlockHashList | ||
| } | ||
|
|
||
| // NewBlocks constructs a new blocks type | ||
| func NewBlocks( | ||
| chainID flow.ChainID, | ||
| rootAddress flow.Address, | ||
| storage types.BackendStorage, | ||
| ) (*Blocks, error) { | ||
| var err error | ||
| blocks := &Blocks{ | ||
| chainID: chainID, | ||
| storage: storage, | ||
| rootAddress: rootAddress, | ||
| } | ||
| blocks.bhl, err = handler.NewBlockHashList( | ||
| storage, | ||
| rootAddress, | ||
| handler.BlockHashListCapacity, | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // if empty insert genesis block hash | ||
| if blocks.bhl.IsEmpty() { | ||
| genesis := types.GenesisBlock(chainID) | ||
| err = blocks.PushBlockMeta( | ||
| NewMeta( | ||
| genesis.Height, | ||
| genesis.Timestamp, | ||
| genesis.PrevRandao, | ||
| )) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| // push block hash | ||
| err = blocks.PushBlockHash( | ||
| genesis.Height, | ||
| types.GenesisBlockHash(chainID)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return blocks, nil | ||
| } | ||
|
|
||
| // PushBlock pushes a new block into the storage | ||
| func (b *Blocks) PushBlockMeta( | ||
| meta *Meta, | ||
| ) error { | ||
| // check height order | ||
| if meta.Height > 0 { | ||
| bm, err := b.LatestBlock() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if meta.Height != bm.Height+1 { | ||
| return fmt.Errorf("out of order block meta push! got: %d, expected %d ", meta.Height, bm.Height+1) | ||
| } | ||
| } | ||
| return b.storeBlockMetaData(meta) | ||
| } | ||
|
|
||
| // PushBlockHash pushes a new block block hash into the storage | ||
| func (b *Blocks) PushBlockHash( | ||
| height uint64, | ||
| hash gethCommon.Hash, | ||
| ) error { | ||
| return b.bhl.Push(height, hash) | ||
| } | ||
|
|
||
| func (b *Blocks) LatestBlock() (*Meta, error) { | ||
| return b.loadBlockMetaData() | ||
| } | ||
|
|
||
| // BlockHash returns the block hash for the given height | ||
| func (b *Blocks) BlockHash(height uint64) (gethCommon.Hash, error) { | ||
| _, hash, err := b.bhl.BlockHashByHeight(height) | ||
| return hash, err | ||
| } | ||
|
|
||
| // storeBlockMetaData stores the block meta data into storage | ||
| func (b *Blocks) storeBlockMetaData(bm *Meta) error { | ||
| // store the encoded data into backend | ||
| return b.storage.SetValue( | ||
| b.rootAddress[:], | ||
| []byte(BlockStoreLatestBlockMetaKey), | ||
| bm.Encode(), | ||
| ) | ||
| } | ||
|
|
||
| // loadBlockMetaData loads the block meta data from the storage | ||
| func (b *Blocks) loadBlockMetaData() (*Meta, error) { | ||
| data, err := b.storage.GetValue( | ||
| b.rootAddress[:], | ||
| []byte(BlockStoreLatestBlockMetaKey), | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return MetaFromEncoded(data) | ||
| } |
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