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on_chain_verifier.go
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on_chain_verifier.go
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// Copyright (c) 2022 Gobalsky Labs Limited
//
// Use of this software is governed by the Business Source License included
// in the LICENSE.VEGA file and at https://www.mariadb.com/bsl11.
//
// Change Date: 18 months from the later of the date of the first publicly
// available Distribution of this version of the repository, and 25 June 2022.
//
// On the date above, in accordance with the Business Source License, use
// of this software will be governed by version 3 or later of the GNU General
// Public License.
package erc20multisig
import (
"context"
"errors"
"math/big"
"sync"
"time"
multisig "code.vegaprotocol.io/vega/core/contracts/multisig_control"
"code.vegaprotocol.io/vega/core/types"
"code.vegaprotocol.io/vega/logging"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
ethcmn "github.com/ethereum/go-ethereum/common"
)
var (
ErrNoSignerEventFound = errors.New("no signer event found")
ErrNoThresholdSetEventFound = errors.New("no threshold set event found")
ErrUnsupportedSignerEvent = errors.New("unsupported signer event")
)
type EthereumClient interface {
bind.ContractFilterer
}
type EthConfirmations interface {
Check(uint64) error
}
type OnChainVerifier struct {
config Config
log *logging.Logger
ethClient EthereumClient
ethConfirmations EthConfirmations
mu sync.RWMutex
multiSigAddress ethcmn.Address
}
func NewOnChainVerifier(
config Config,
log *logging.Logger,
ethClient EthereumClient,
ethConfirmations EthConfirmations,
) *OnChainVerifier {
log = log.Named(namedLogger + ".on-chain-verifier")
log.SetLevel(config.Level.Get())
return &OnChainVerifier{
config: config,
log: log,
ethClient: ethClient,
ethConfirmations: ethConfirmations,
}
}
func (o *OnChainVerifier) UpdateMultiSigAddress(multiSigAddress ethcmn.Address) {
o.mu.Lock()
defer o.mu.Unlock()
o.multiSigAddress = multiSigAddress
if o.log.GetLevel() <= logging.DebugLevel {
o.log.Debug("multi sig bridge addresses updated",
logging.String("addresses", o.multiSigAddress.Hex()))
}
}
func (o *OnChainVerifier) CheckSignerEvent(event *types.SignerEvent) error {
o.mu.RLock()
defer o.mu.RUnlock()
if o.log.GetLevel() <= logging.DebugLevel {
o.log.Debug("checking signer event on chain",
logging.String("contract-address", o.multiSigAddress.Hex()),
logging.String("event", event.String()),
)
}
filterer, err := multisig.NewMultisigControlFilterer(
o.multiSigAddress,
o.ethClient,
)
if err != nil {
o.log.Error("could not instantiate multisig control filterer",
logging.Error(err))
return err
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
switch event.Kind {
case types.SignerEventKindAdded:
return o.filterSignerAdded(ctx, filterer, event)
case types.SignerEventKindRemoved:
return o.filterSignerRemoved(ctx, filterer, event)
default:
return ErrUnsupportedSignerEvent
}
}
func (o *OnChainVerifier) CheckThresholdSetEvent(
event *types.SignerThresholdSetEvent,
) error {
o.mu.RLock()
defer o.mu.RUnlock()
if o.log.GetLevel() <= logging.DebugLevel {
o.log.Debug("checking threshold set event on chain",
logging.String("contract-address", o.multiSigAddress.Hex()),
logging.String("event", event.String()),
)
}
filterer, err := multisig.NewMultisigControlFilterer(
o.multiSigAddress,
o.ethClient,
)
if err != nil {
o.log.Error("could not instantiate multisig control filterer",
logging.Error(err))
return err
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
iter, err := filterer.FilterThresholdSet(
&bind.FilterOpts{
Start: event.BlockNumber,
End: &event.BlockNumber,
Context: ctx,
},
)
if err != nil {
o.log.Error("Couldn't start filtering on signer added event",
logging.Error(err))
return err
}
defer iter.Close()
for iter.Next() {
if o.log.GetLevel() <= logging.DebugLevel {
o.log.Debug("found threshold set event on chain",
logging.Uint16("new-threshold", iter.Event.NewThreshold),
)
}
nonce, _ := big.NewInt(0).SetString(event.Nonce, 10)
if iter.Event.Raw.BlockNumber == event.BlockNumber &&
uint64(iter.Event.Raw.Index) == event.LogIndex &&
iter.Event.NewThreshold == uint16(event.Threshold) &&
nonce.Cmp(iter.Event.Nonce) == 0 {
// now we know the event is OK,
// just need to check for confirmations
return o.ethConfirmations.Check(event.BlockNumber)
}
}
return ErrNoThresholdSetEventFound
}
func (o *OnChainVerifier) filterSignerAdded(
ctx context.Context,
filterer *multisig.MultisigControlFilterer,
event *types.SignerEvent,
) error {
iter, err := filterer.FilterSignerAdded(
&bind.FilterOpts{
Start: event.BlockNumber,
End: &event.BlockNumber,
Context: ctx,
},
)
if err != nil {
o.log.Error("Couldn't start filtering on signer added event",
logging.Error(err))
return err
}
defer iter.Close()
for iter.Next() {
if o.log.GetLevel() <= logging.DebugLevel {
o.log.Debug("found signer added event on chain",
logging.String("new-signer", iter.Event.NewSigner.Hex()),
)
}
nonce, _ := big.NewInt(0).SetString(event.Nonce, 10)
if iter.Event.Raw.BlockNumber == event.BlockNumber &&
uint64(iter.Event.Raw.Index) == event.LogIndex &&
iter.Event.NewSigner.Hex() == event.Address &&
nonce.Cmp(iter.Event.Nonce) == 0 {
// now we know the event is OK,
// just need to check for confirmations
return o.ethConfirmations.Check(event.BlockNumber)
}
}
return ErrNoSignerEventFound
}
func (o *OnChainVerifier) filterSignerRemoved(
ctx context.Context,
filterer *multisig.MultisigControlFilterer,
event *types.SignerEvent,
) error {
iter, err := filterer.FilterSignerRemoved(
&bind.FilterOpts{
Start: event.BlockNumber,
End: &event.BlockNumber,
Context: ctx,
},
)
if err != nil {
o.log.Error("Couldn't start filtering on signer removed event",
logging.Error(err))
return err
}
defer iter.Close()
for iter.Next() {
if o.log.GetLevel() <= logging.DebugLevel {
o.log.Debug("found signer removed event on chain",
logging.String("old-signer", iter.Event.OldSigner.Hex()),
)
}
nonce, _ := big.NewInt(0).SetString(event.Nonce, 10)
if iter.Event.Raw.BlockNumber == event.BlockNumber &&
uint64(iter.Event.Raw.Index) == event.LogIndex &&
iter.Event.OldSigner.Hex() == event.Address &&
nonce.Cmp(iter.Event.Nonce) == 0 {
// now we know the event is OK,
// just need to check for confirmations
return o.ethConfirmations.Check(event.BlockNumber)
}
}
return ErrNoSignerEventFound
}