[#51] balance: Support notary contract
Signed-off-by: Alex Vanin <alexey@nspcc.ru>
This commit is contained in:
Alex Vanin
Alex Vanin
parent
299c888266
commit
c6816193d3
1 changed files with 64 additions and 160 deletions
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@ -113,181 +113,115 @@ func Transfer(from, to interop.Hash160, amount int, data interface{}) bool {
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}
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func TransferX(from, to interop.Hash160, amount int, details []byte) bool {
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var (
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n int // number of votes for inner ring invoke
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hashTxID []byte // ballot key of the inner ring invocation
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)
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innerRing := irList()
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threshold := len(innerRing)/3*2 + 1
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irKey := common.InnerRingInvoker(innerRing)
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if len(irKey) == 0 {
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multiaddr := common.InnerRingMultiAddressViaStorage(ctx, netmapContractKey)
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if !runtime.CheckWitness(multiaddr) {
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panic("transferX: this method must be invoked from inner ring")
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}
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fromKnownContract := fromKnownContract(runtime.GetCallingScriptHash())
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if fromKnownContract {
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n = threshold
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runtime.Log("transferX: processed indirect invoke")
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result := token.transfer(ctx, from, to, amount, true, details)
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if result {
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runtime.Log("transferX: success")
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} else {
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hashTxID = common.InvokeID([]interface{}{from, to, amount}, []byte("transfer"))
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n = common.Vote(ctx, hashTxID, irKey)
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// consider panic there
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runtime.Log("transferX: fail")
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}
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if n >= threshold {
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common.RemoveVotes(ctx, hashTxID)
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result := token.transfer(ctx, from, to, amount, true, details)
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if result {
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runtime.Log("transferX: success")
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} else {
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// consider panic there
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runtime.Log("transferX: fail")
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}
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return result
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}
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return false
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return result
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}
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func Lock(txID []byte, from, to interop.Hash160, amount, until int) bool {
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innerRing := irList()
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threshold := len(innerRing)/3*2 + 1
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irKey := common.InnerRingInvoker(innerRing)
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if len(irKey) == 0 {
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multiaddr := common.InnerRingMultiAddressViaStorage(ctx, netmapContractKey)
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if !runtime.CheckWitness(multiaddr) {
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panic("lock: this method must be invoked from inner ring")
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}
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hashTxID := common.InvokeID([]interface{}{txID, from, to, amount, until}, []byte("lock"))
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lockAccount := Account{
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Balance: 0,
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Until: until,
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Parent: from,
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}
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common.SetSerialized(ctx, to, lockAccount)
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n := common.Vote(ctx, hashTxID, irKey)
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if n >= threshold {
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common.RemoveVotes(ctx, hashTxID)
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lockAccount := Account{
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Balance: 0,
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Until: until,
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Parent: from,
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}
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common.SetSerialized(ctx, to, lockAccount)
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result := token.transfer(ctx, from, to, amount, true, lockTransferMsg)
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if !result {
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// consider using `return false` to remove votes
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panic("lock: can't lock funds")
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}
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runtime.Log("lock: created lock account")
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runtime.Notify("Lock", txID, from, to, amount, until)
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result := token.transfer(ctx, from, to, amount, true, lockTransferMsg)
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if !result {
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// consider using `return false` to remove votes
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panic("lock: can't lock funds")
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}
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runtime.Log("lock: processed invoke from inner ring")
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runtime.Log("lock: created lock account")
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runtime.Notify("Lock", txID, from, to, amount, until)
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return true
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}
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func NewEpoch(epochNum int) bool {
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innerRing := irList()
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threshold := len(innerRing)/3*2 + 1
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irKey := common.InnerRingInvoker(innerRing)
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if len(irKey) == 0 {
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multiaddr := common.InnerRingMultiAddressViaStorage(ctx, netmapContractKey)
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if !runtime.CheckWitness(multiaddr) {
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panic("epochNum: this method must be invoked from inner ring")
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}
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epochID := common.InvokeID([]interface{}{epochNum}, []byte("epoch"))
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it := storage.Find(ctx, []byte{}, storage.KeysOnly)
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for iterator.Next(it) {
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addr := iterator.Value(it).([]byte) // it MUST BE `storage.KeysOnly`
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if len(addr) != 20 {
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continue
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}
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n := common.Vote(ctx, epochID, irKey)
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if n >= threshold {
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common.RemoveVotes(ctx, epochID)
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it := storage.Find(ctx, []byte{}, storage.KeysOnly)
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for iterator.Next(it) {
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addr := iterator.Value(it).([]byte) // it MUST BE `storage.KeysOnly`
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if len(addr) != 20 {
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continue
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}
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acc := getAccount(ctx, addr)
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if acc.Until == 0 {
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continue
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}
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acc := getAccount(ctx, addr)
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if acc.Until == 0 {
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continue
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}
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if epochNum >= acc.Until {
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// return assets back to the parent
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token.transfer(ctx, addr, acc.Parent, acc.Balance, true, unlockTransferMsg)
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}
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if epochNum >= acc.Until {
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// return assets back to the parent
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token.transfer(ctx, addr, acc.Parent, acc.Balance, true, unlockTransferMsg)
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}
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}
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runtime.Log("newEpoch: processed invoke from inner ring")
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return true
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}
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func Mint(to interop.Hash160, amount int, details []byte) bool {
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innerRing := irList()
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threshold := len(innerRing)/3*2 + 1
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irKey := common.InnerRingInvoker(innerRing)
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if len(irKey) == 0 {
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panic("burn: this method must be invoked from inner ring")
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multiaddr := common.InnerRingMultiAddressViaStorage(ctx, netmapContractKey)
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if !runtime.CheckWitness(multiaddr) {
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panic("mint: this method must be invoked from inner ring")
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}
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mintID := common.InvokeID([]interface{}{to, amount, details}, []byte("mint"))
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n := common.Vote(ctx, mintID, irKey)
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if n >= threshold {
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common.RemoveVotes(ctx, mintID)
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ok := token.transfer(ctx, nil, to, amount, true, details)
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if !ok {
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panic("mint: can't transfer assets")
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}
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supply := token.getSupply(ctx)
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supply = supply + amount
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storage.Put(ctx, token.CirculationKey, supply)
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runtime.Log("mint: assets were minted")
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runtime.Notify("Mint", to, amount)
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ok := token.transfer(ctx, nil, to, amount, true, details)
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if !ok {
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panic("mint: can't transfer assets")
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}
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supply := token.getSupply(ctx)
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supply = supply + amount
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storage.Put(ctx, token.CirculationKey, supply)
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runtime.Log("mint: assets were minted")
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runtime.Notify("Mint", to, amount)
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return true
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}
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func Burn(from interop.Hash160, amount int, details []byte) bool {
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innerRing := irList()
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threshold := len(innerRing)/3*2 + 1
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irKey := common.InnerRingInvoker(innerRing)
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if len(irKey) == 0 {
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multiaddr := common.InnerRingMultiAddressViaStorage(ctx, netmapContractKey)
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if !runtime.CheckWitness(multiaddr) {
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panic("burn: this method must be invoked from inner ring")
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}
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burnID := common.InvokeID([]interface{}{from, amount, details}, []byte("burn"))
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n := common.Vote(ctx, burnID, irKey)
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if n >= threshold {
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common.RemoveVotes(ctx, burnID)
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ok := token.transfer(ctx, from, nil, amount, true, details)
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if !ok {
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panic("burn: can't transfer assets")
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}
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supply := token.getSupply(ctx)
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if supply < amount {
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panic("panic, negative supply after burn")
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}
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supply = supply - amount
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storage.Put(ctx, token.CirculationKey, supply)
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runtime.Log("burn: assets were burned")
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runtime.Notify("Burn", from, amount)
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ok := token.transfer(ctx, from, nil, amount, true, details)
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if !ok {
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panic("burn: can't transfer assets")
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}
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supply := token.getSupply(ctx)
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if supply < amount {
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panic("panic, negative supply after burn")
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}
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supply = supply - amount
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storage.Put(ctx, token.CirculationKey, supply)
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runtime.Log("burn: assets were burned")
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runtime.Notify("Burn", from, amount)
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return true
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}
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@ -389,33 +323,3 @@ func getAccount(ctx storage.Context, key interface{}) Account {
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return Account{}
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}
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/*
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Check if invocation made from known container or audit contracts.
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This is necessary because calls from these contracts require to do transfer
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without signature collection (1 invoke transfer).
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IR1, IR2, IR3, IR4 -(4 invokes)-> [ Container Contract ] -(1 invoke)-> [ Balance Contract ]
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We can do 1 invoke transfer if:
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- invoke happened from inner ring node,
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- it is indirect invocation from other smart-contract.
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However there is a possible attack, when malicious inner ring node creates
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malicious smart-contract in morph chain to do inderect call.
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MaliciousIR -(1 invoke)-> [ Malicious Contract ] -(1 invoke) -> [ Balance Contract ]
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To prevent that, we have to allow 1 invoke transfer from authorised well known
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smart-contracts, that will be set up at `Init` method.
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*/
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func fromKnownContract(caller interop.Hash160) bool {
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containerContractAddr := storage.Get(ctx, containerContractKey).([]byte)
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return common.BytesEqual(caller, containerContractAddr)
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}
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func irList() []common.IRNode {
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return common.InnerRingListViaStorage(ctx, netmapContractKey)
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}
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