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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package evm
import (
"bytes"
"errors"
"fmt"
"sort"
"github.com/ava-labs/coreth/core/state"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow"
"github.com/ava-labs/avalanchego/utils"
"github.com/ava-labs/avalanchego/utils/codec"
"github.com/ava-labs/avalanchego/utils/crypto"
"github.com/ava-labs/avalanchego/utils/hashing"
"github.com/ava-labs/avalanchego/vms/components/verify"
"github.com/ava-labs/avalanchego/vms/secp256k1fx"
"github.com/ethereum/go-ethereum/common"
)
var (
errWrongBlockchainID = errors.New("wrong blockchain ID provided")
errWrongNetworkID = errors.New("tx was issued with a different network ID")
errNilTx = errors.New("tx is nil")
)
// EVMOutput defines an output from EVM State created from export transactions
type EVMOutput struct {
Address common.Address `serialize:"true" json:"address"`
Amount uint64 `serialize:"true" json:"amount"`
AssetID ids.ID `serialize:"true" json:"assetID"`
}
// EVMInput defines an input for the EVM State to be used in import transactions
type EVMInput struct {
Address common.Address `serialize:"true" json:"address"`
Amount uint64 `serialize:"true" json:"amount"`
AssetID ids.ID `serialize:"true" json:"assetID"`
Nonce uint64 `serialize:"true" json:"nonce"`
}
// Verify ...
func (out *EVMOutput) Verify() error {
return nil
}
// Verify ...
func (in *EVMInput) Verify() error {
return nil
}
// UnsignedTx is an unsigned transaction
type UnsignedTx interface {
Initialize(unsignedBytes, signedBytes []byte)
ID() ids.ID
UnsignedBytes() []byte
Bytes() []byte
}
// UnsignedAtomicTx is an unsigned operation that can be atomically accepted
type UnsignedAtomicTx interface {
UnsignedTx
// UTXOs this tx consumes
InputUTXOs() ids.Set
// Attempts to verify this transaction with the provided state.
SemanticVerify(vm *VM, stx *Tx) TxError
// Accept this transaction with the additionally provided state transitions.
Accept(ctx *snow.Context, batch database.Batch) error
EVMStateTransfer(vm *VM, state *state.StateDB) error
}
// Tx is a signed transaction
type Tx struct {
// The body of this transaction
UnsignedTx `serialize:"true" json:"unsignedTx"`
// The credentials of this transaction
Creds []verify.Verifiable `serialize:"true" json:"credentials"`
}
// (*secp256k1fx.Credential)
// Sign this transaction with the provided signers
func (tx *Tx) Sign(c codec.Manager, signers [][]*crypto.PrivateKeySECP256K1R) error {
unsignedBytes, err := c.Marshal(codecVersion, &tx.UnsignedTx)
if err != nil {
return fmt.Errorf("couldn't marshal UnsignedTx: %w", err)
}
// Attach credentials
hash := hashing.ComputeHash256(unsignedBytes)
for _, keys := range signers {
cred := &secp256k1fx.Credential{
Sigs: make([][crypto.SECP256K1RSigLen]byte, len(keys)),
}
for i, key := range keys {
sig, err := key.SignHash(hash) // Sign hash
if err != nil {
return fmt.Errorf("problem generating credential: %w", err)
}
copy(cred.Sigs[i][:], sig)
}
tx.Creds = append(tx.Creds, cred) // Attach credential
}
signedBytes, err := c.Marshal(codecVersion, tx)
if err != nil {
return fmt.Errorf("couldn't marshal Tx: %w", err)
}
tx.Initialize(unsignedBytes, signedBytes)
return nil
}
// innerSortInputsAndSigners implements sort.Interface for EVMInput
type innerSortInputsAndSigners struct {
inputs []EVMInput
signers [][]*crypto.PrivateKeySECP256K1R
}
func (ins *innerSortInputsAndSigners) Less(i, j int) bool {
addrComp := bytes.Compare(ins.inputs[i].Address.Bytes(), ins.inputs[j].Address.Bytes())
if addrComp != 0 {
return addrComp < 0
}
return bytes.Compare(ins.inputs[i].AssetID[:], ins.inputs[j].AssetID[:]) < 0
}
func (ins *innerSortInputsAndSigners) Len() int { return len(ins.inputs) }
func (ins *innerSortInputsAndSigners) Swap(i, j int) {
ins.inputs[j], ins.inputs[i] = ins.inputs[i], ins.inputs[j]
ins.signers[j], ins.signers[i] = ins.signers[i], ins.signers[j]
}
// SortEVMInputsAndSigners sorts the list of EVMInputs based on the addresses and assetIDs
func SortEVMInputsAndSigners(inputs []EVMInput, signers [][]*crypto.PrivateKeySECP256K1R) {
sort.Sort(&innerSortInputsAndSigners{inputs: inputs, signers: signers})
}
// IsSortedAndUniqueEVMInputs returns true if the EVM Inputs are sorted and unique
// based on the account addresses
func IsSortedAndUniqueEVMInputs(inputs []EVMInput) bool {
return utils.IsSortedAndUnique(&innerSortInputsAndSigners{inputs: inputs})
}
// innerSortEVMOutputs implements sort.Interface for EVMOutput
type innerSortEVMOutputs struct {
outputs []EVMOutput
}
func (outs *innerSortEVMOutputs) Less(i, j int) bool {
addrComp := bytes.Compare(outs.outputs[i].Address.Bytes(), outs.outputs[j].Address.Bytes())
if addrComp != 0 {
return addrComp < 0
}
return bytes.Compare(outs.outputs[i].AssetID[:], outs.outputs[j].AssetID[:]) < 0
}
func (outs *innerSortEVMOutputs) Len() int { return len(outs.outputs) }
func (outs *innerSortEVMOutputs) Swap(i, j int) {
outs.outputs[j], outs.outputs[i] = outs.outputs[i], outs.outputs[j]
}
// SortEVMOutputs sorts the list of EVMOutputs based on the addresses and assetIDs
// of the outputs
func SortEVMOutputs(outputs []EVMOutput) {
sort.Sort(&innerSortEVMOutputs{outputs: outputs})
}
// IsSortedAndUniqueEVMOutputs returns true if the EVMOutputs are sorted and unique
// based on the account addresses and assetIDs
func IsSortedAndUniqueEVMOutputs(outputs []EVMOutput) bool {
return utils.IsSortedAndUnique(&innerSortEVMOutputs{outputs: outputs})
}
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