lotus/itests/kit/evm.go

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package kit
import (
"bytes"
"context"
"encoding/binary"
"fmt"
"github.com/ipfs/go-cid"
"github.com/multiformats/go-varint"
"github.com/stretchr/testify/require"
cbg "github.com/whyrusleeping/cbor-gen"
"golang.org/x/crypto/sha3"
"github.com/filecoin-project/go-address"
amt4 "github.com/filecoin-project/go-amt-ipld/v4"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/go-state-types/big"
builtintypes "github.com/filecoin-project/go-state-types/builtin"
"github.com/filecoin-project/go-state-types/builtin/v10/eam"
"github.com/filecoin-project/go-state-types/crypto"
"github.com/filecoin-project/lotus/api"
"github.com/filecoin-project/lotus/chain/actors"
"github.com/filecoin-project/lotus/chain/types"
"github.com/filecoin-project/lotus/chain/types/ethtypes"
"github.com/filecoin-project/lotus/chain/wallet/key"
"github.com/filecoin-project/lotus/lib/sigs"
)
// EVM groups EVM-related actions.
type EVM struct{ *TestFullNode }
func (f *TestFullNode) EVM() *EVM {
return &EVM{f}
}
func (e *EVM) DeployContract(ctx context.Context, sender address.Address, bytecode []byte) eam.CreateReturn {
require := require.New(e.t)
nonce, err := e.MpoolGetNonce(ctx, sender)
if err != nil {
nonce = 0 // assume a zero nonce on error (e.g. sender doesn't exist).
}
var salt [32]byte
binary.BigEndian.PutUint64(salt[:], nonce)
method := builtintypes.MethodsEAM.CreateExternal
initcode := abi.CborBytes(bytecode)
params, err := actors.SerializeParams(&initcode)
require.NoError(err)
msg := &types.Message{
To: builtintypes.EthereumAddressManagerActorAddr,
From: sender,
Value: big.Zero(),
Method: method,
Params: params,
}
e.t.Log("sending create message")
smsg, err := e.MpoolPushMessage(ctx, msg, nil)
require.NoError(err)
e.t.Log("waiting for message to execute")
wait, err := e.StateWaitMsg(ctx, smsg.Cid(), 0, 0, false)
require.NoError(err)
require.True(wait.Receipt.ExitCode.IsSuccess(), "contract installation failed")
var result eam.CreateReturn
r := bytes.NewReader(wait.Receipt.Return)
err = result.UnmarshalCBOR(r)
require.NoError(err)
return result
}
func (e *EVM) InvokeSolidity(ctx context.Context, sender address.Address, target address.Address, selector []byte, inputData []byte) *api.MsgLookup {
require := require.New(e.t)
params := append(selector, inputData...)
var buffer bytes.Buffer
err := cbg.WriteByteArray(&buffer, params)
require.NoError(err)
params = buffer.Bytes()
msg := &types.Message{
To: target,
From: sender,
Value: big.Zero(),
Method: builtintypes.MethodsEVM.InvokeContract,
Params: params,
}
e.t.Log("sending invoke message")
smsg, err := e.MpoolPushMessage(ctx, msg, nil)
require.NoError(err)
e.t.Log("waiting for message to execute")
wait, err := e.StateWaitMsg(ctx, smsg.Cid(), 0, 0, false)
require.NoError(err)
return wait
}
// LoadEvents loads all events in an event AMT.
func (e *EVM) LoadEvents(ctx context.Context, eventsRoot cid.Cid) []types.Event {
require := require.New(e.t)
s := &apiIpldStore{ctx, e}
amt, err := amt4.LoadAMT(ctx, s, eventsRoot, amt4.UseTreeBitWidth(types.EventAMTBitwidth))
require.NoError(err)
ret := make([]types.Event, 0, amt.Len())
err = amt.ForEach(ctx, func(u uint64, deferred *cbg.Deferred) error {
var evt types.Event
if err := evt.UnmarshalCBOR(bytes.NewReader(deferred.Raw)); err != nil {
return err
}
ret = append(ret, evt)
return nil
})
require.NoError(err)
return ret
}
func (e *EVM) NewAccount() (*key.Key, ethtypes.EthAddress, address.Address) {
// Generate a secp256k1 key; this will back the Ethereum identity.
key, err := key.GenerateKey(types.KTSecp256k1)
require.NoError(e.t, err)
ethAddr, err := ethtypes.EthAddressFromPubKey(key.PublicKey)
require.NoError(e.t, err)
ea, err := ethtypes.CastEthAddress(ethAddr)
require.NoError(e.t, err)
addr, err := ea.ToFilecoinAddress()
require.NoError(e.t, err)
return key, *(*ethtypes.EthAddress)(ethAddr), addr
}
// AssertAddressBalanceConsistent checks that the balance reported via the
// Filecoin and Ethereum operations for an f410 address is identical, returning
// the balance.
func (e *EVM) AssertAddressBalanceConsistent(ctx context.Context, addr address.Address) big.Int {
// Validate the arg is an f410 address.
require.Equal(e.t, address.Delegated, addr.Protocol())
payload := addr.Payload()
namespace, _, err := varint.FromUvarint(payload)
require.NoError(e.t, err)
require.Equal(e.t, builtintypes.EthereumAddressManagerActorID, namespace)
fbal, err := e.WalletBalance(ctx, addr)
require.NoError(e.t, err)
ethAddr, err := ethtypes.EthAddressFromFilecoinAddress(addr)
require.NoError(e.t, err)
ebal, err := e.EthGetBalance(ctx, ethAddr, "latest")
require.NoError(e.t, err)
require.Equal(e.t, fbal, types.BigInt(ebal))
return fbal
}
// SignTransaction signs an Ethereum transaction in place with the supplied private key.
func (e *EVM) SignTransaction(tx *ethtypes.EthTxArgs, privKey []byte) {
preimage, err := tx.ToRlpUnsignedMsg()
require.NoError(e.t, err)
// sign the RLP payload
signature, err := sigs.Sign(crypto.SigTypeDelegated, privKey, preimage)
require.NoError(e.t, err)
r, s, v, err := ethtypes.RecoverSignature(*signature)
require.NoError(e.t, err)
tx.V = big.Int(v)
tx.R = big.Int(r)
tx.S = big.Int(s)
}
// SubmitTransaction submits the transaction via the Eth endpoint.
func (e *EVM) SubmitTransaction(ctx context.Context, tx *ethtypes.EthTxArgs) ethtypes.EthHash {
signed, err := tx.ToRlpSignedMsg()
require.NoError(e.t, err)
hash, err := e.EthSendRawTransaction(ctx, signed)
require.NoError(e.t, err)
return hash
}
// ComputeContractAddress computes the address of a contract deployed by the
// specified address with the specified nonce.
func (e *EVM) ComputeContractAddress(deployer ethtypes.EthAddress, nonce uint64) ethtypes.EthAddress {
nonceRlp, err := formatInt(int(nonce))
require.NoError(e.t, err)
encoded, err := ethtypes.EncodeRLP([]interface{}{
deployer[:],
nonceRlp,
})
require.NoError(e.t, err)
hasher := sha3.NewLegacyKeccak256()
hasher.Write(encoded)
return *(*ethtypes.EthAddress)(hasher.Sum(nil)[12:])
}
// TODO: cleanup and put somewhere reusable.
type apiIpldStore struct {
ctx context.Context
api api.FullNode
}
func (ht *apiIpldStore) Context() context.Context {
return ht.ctx
}
func (ht *apiIpldStore) Get(ctx context.Context, c cid.Cid, out interface{}) error {
raw, err := ht.api.ChainReadObj(ctx, c)
if err != nil {
return err
}
cu, ok := out.(cbg.CBORUnmarshaler)
if ok {
if err := cu.UnmarshalCBOR(bytes.NewReader(raw)); err != nil {
return err
}
return nil
}
return fmt.Errorf("object does not implement CBORUnmarshaler")
}
func (ht *apiIpldStore) Put(ctx context.Context, v interface{}) (cid.Cid, error) {
panic("No mutations allowed")
}
func formatInt(val int) ([]byte, error) {
buf := new(bytes.Buffer)
err := binary.Write(buf, binary.BigEndian, int64(val))
if err != nil {
return nil, err
}
return removeLeadingZeros(buf.Bytes()), nil
}
func removeLeadingZeros(data []byte) []byte {
firstNonZeroIndex := len(data)
for i, b := range data {
if b > 0 {
firstNonZeroIndex = i
break
}
}
return data[firstNonZeroIndex:]
}