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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package evm
import (
"errors"
"fmt"
"math/big"
"github.com/ava-labs/coreth/core/types"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow/choices"
"github.com/ava-labs/avalanchego/snow/consensus/snowman"
"github.com/ava-labs/avalanchego/vms/components/missing"
)
// Block implements the snowman.Block interface
type Block struct {
id ids.ID
ethBlock *types.Block
vm *VM
}
// ID implements the snowman.Block interface
func (b *Block) ID() ids.ID { return b.id }
// Accept implements the snowman.Block interface
func (b *Block) Accept() error {
vm := b.vm
log.Trace(fmt.Sprintf("Block %s is accepted", b.ID()))
vm.updateStatus(b.id, choices.Accepted)
if err := vm.acceptedDB.Put(b.ethBlock.Number().Bytes(), b.id[:]); err != nil {
return err
}
tx := vm.getAtomicTx(b.ethBlock)
if tx == nil {
return nil
}
utx, ok := tx.UnsignedTx.(UnsignedAtomicTx)
if !ok {
return errors.New("unknown tx type")
}
return utx.Accept(vm.ctx, nil)
}
// Reject implements the snowman.Block interface
func (b *Block) Reject() error {
log.Trace(fmt.Sprintf("Block %s is rejected", b.ID()))
b.vm.updateStatus(b.ID(), choices.Rejected)
return nil
}
// Status implements the snowman.Block interface
func (b *Block) Status() choices.Status {
status := b.vm.getCachedStatus(b.ID())
if status == choices.Unknown && b.ethBlock != nil {
return choices.Processing
}
return status
}
// Parent implements the snowman.Block interface
func (b *Block) Parent() snowman.Block {
parentID := ids.ID(b.ethBlock.ParentHash())
if block := b.vm.getBlock(parentID); block != nil {
return block
}
return &missing.Block{BlkID: parentID}
}
// Height implements the snowman.Block interface
func (b *Block) Height() uint64 {
return b.ethBlock.Number().Uint64()
}
// Verify implements the snowman.Block interface
func (b *Block) Verify() error {
// Only enforce a minimum fee when bootstrapping has finished
if b.vm.ctx.IsBootstrapped() {
// Ensure the minimum gas price is paid for every transaction
timestamp := b.ethBlock.Header().Time
minGasPrice := b.vm.minGasPrice.GetMin(new(big.Int).SetUint64(timestamp))
for _, tx := range b.ethBlock.Transactions() {
if tx.GasPrice().Cmp(minGasPrice) < 0 {
return fmt.Errorf("block contains tx %s with gas price too low (%d < %d), timestamp: %d", tx.Hash(), tx.GasPrice(), minGasPrice, timestamp)
}
}
}
vm := b.vm
tx := vm.getAtomicTx(b.ethBlock)
if tx != nil {
pState, err := b.vm.chain.BlockState(b.Parent().(*Block).ethBlock)
if err != nil {
return err
}
switch atx := tx.UnsignedTx.(type) {
case *UnsignedImportTx:
if b.ethBlock.Hash() == vm.genesisHash {
return nil
}
p := b.Parent()
path := []*Block{}
inputs := new(ids.Set)
for {
if p.Status() == choices.Accepted || p.(*Block).ethBlock.Hash() == vm.genesisHash {
break
}
if ret, hit := vm.blockAtomicInputCache.Get(p.ID()); hit {
inputs = ret.(*ids.Set)
break
}
path = append(path, p.(*Block))
p = p.Parent().(*Block)
}
for i := len(path) - 1; i >= 0; i-- {
inputsCopy := new(ids.Set)
p := path[i]
atx := vm.getAtomicTx(p.ethBlock)
if atx != nil {
inputs.Union(atx.UnsignedTx.(UnsignedAtomicTx).InputUTXOs())
inputsCopy.Union(*inputs)
}
vm.blockAtomicInputCache.Put(p.ID(), inputsCopy)
}
for _, in := range atx.InputUTXOs().List() {
if inputs.Contains(in) {
return errInvalidBlock
}
}
case *UnsignedExportTx:
default:
return errors.New("unknown atomic tx type")
}
utx := tx.UnsignedTx.(UnsignedAtomicTx)
if err := utx.SemanticVerify(vm, tx); err != nil {
return fmt.Errorf("block atomic tx failed verification due to: %w", err)
}
bc := vm.chain.BlockChain()
_, _, _, err = bc.Processor().Process(b.ethBlock, pState, *bc.GetVMConfig())
if err != nil {
return fmt.Errorf("block failed processing due to: %w", err)
}
}
_, err := b.vm.chain.InsertChain([]*types.Block{b.ethBlock})
if err != nil {
return fmt.Errorf("failed to insert block into chain due to: %w", err)
}
return nil
}
// Bytes implements the snowman.Block interface
func (b *Block) Bytes() []byte {
res, err := rlp.EncodeToBytes(b.ethBlock)
if err != nil {
panic(err)
}
return res
}
func (b *Block) String() string { return fmt.Sprintf("EVM block, ID = %s", b.ID()) }
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