laconicd/x/evm/keeper/abci.go

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package keeper
import (
"math/big"
abci "github.com/tendermint/tendermint/abci/types"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/ethereum/go-ethereum/common"
ethtypes "github.com/ethereum/go-ethereum/core/types"
)
// BeginBlock sets the block hash -> block height map for the previous block height
// and resets the Bloom filter and the transaction count to 0.
func (k *Keeper) BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock) {
if req.Header.LastBlockId.GetHash() == nil || req.Header.GetHeight() < 1 {
return
}
// Gas costs are handled within msg handler so costs should be ignored
ctx = ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
// Set the hash -> height and height -> hash mapping.
hash := req.Header.LastBlockId.GetHash()
height := req.Header.GetHeight() - 1
k.SetHeightHash(ctx, uint64(height), common.BytesToHash(hash))
k.SetBlockHash(ctx, hash, height)
// reset counters that are used on CommitStateDB.Prepare
k.Bloom = big.NewInt(0)
k.TxCount = 0
}
// EndBlock updates the accounts and commits state objects to the KV Store, while
// deleting the empty ones. It also sets the bloom filers for the request block to
// the store. The EVM end block logic doesn't update the validator set, thus it returns
// an empty slice.
func (k Keeper) EndBlock(ctx sdk.Context, req abci.RequestEndBlock) []abci.ValidatorUpdate {
// Gas costs are handled within msg handler so costs should be ignored
ctx = ctx.WithGasMeter(sdk.NewInfiniteGasMeter())
// Update account balances before committing other parts of state
k.UpdateAccounts(ctx)
// Commit state objects to KV store
if _, err := k.Commit(ctx, true); err != nil {
k.Logger(ctx).Error("failed to commit state objects", "error", err, "height", ctx.BlockHeight())
panic(err)
}
// Clear accounts cache after account data has been committed
k.ClearStateObjects(ctx)
// set the block bloom filter bytes to store
bloom := ethtypes.BytesToBloom(k.Bloom.Bytes())
k.SetBlockBloom(ctx, req.Height, bloom)
return []abci.ValidatorUpdate{}
}