package alphabet import ( "github.com/nspcc-dev/neo-go/pkg/interop" "github.com/nspcc-dev/neo-go/pkg/interop/contract" "github.com/nspcc-dev/neo-go/pkg/interop/native/crypto" "github.com/nspcc-dev/neo-go/pkg/interop/native/gas" "github.com/nspcc-dev/neo-go/pkg/interop/native/management" "github.com/nspcc-dev/neo-go/pkg/interop/native/neo" "github.com/nspcc-dev/neo-go/pkg/interop/runtime" "github.com/nspcc-dev/neo-go/pkg/interop/storage" "github.com/nspcc-dev/neofs-contract/common" ) const ( netmapKey = "netmapScriptHash" proxyKey = "proxyScriptHash" indexKey = "index" totalKey = "threshold" nameKey = "name" notaryDisabledKey = "notary" ) // OnNEP17Payment is a callback for NEP-17 compatible native GAS and NEO // contracts. func OnNEP17Payment(from interop.Hash160, amount int, data interface{}) { caller := runtime.GetCallingScriptHash() if !common.BytesEqual(caller, []byte(gas.Hash)) && !common.BytesEqual(caller, []byte(neo.Hash)) { panic("alphabet contract accepts GAS and NEO only") } } func _deploy(data interface{}, isUpdate bool) { if isUpdate { return } args := data.(struct { notaryDisabled bool addrNetmap interop.Hash160 addrProxy interop.Hash160 name string index int total int }) ctx := storage.GetContext() if len(args.addrNetmap) != 20 || !args.notaryDisabled && len(args.addrProxy) != 20 { panic("incorrect length of contract script hash") } storage.Put(ctx, netmapKey, args.addrNetmap) storage.Put(ctx, proxyKey, args.addrProxy) storage.Put(ctx, nameKey, args.name) storage.Put(ctx, indexKey, args.index) storage.Put(ctx, totalKey, args.total) // initialize the way to collect signatures storage.Put(ctx, notaryDisabledKey, args.notaryDisabled) if args.notaryDisabled { common.InitVote(ctx) runtime.Log(args.name + " notary disabled") } runtime.Log(args.name + " contract initialized") } // Update method updates contract source code and manifest. Can be invoked // only by committee. func Update(script []byte, manifest []byte, data interface{}) { if !common.HasUpdateAccess() { panic("only committee can update contract") } contract.Call(interop.Hash160(management.Hash), "update", contract.All, script, manifest, common.AppendVersion(data)) runtime.Log("alphabet contract updated") } // GAS returns amount of side chain GAS stored in contract account. func Gas() int { return gas.BalanceOf(runtime.GetExecutingScriptHash()) } // NEO returns amount of side chain NEO stored in contract account. func Neo() int { return neo.BalanceOf(runtime.GetExecutingScriptHash()) } func currentEpoch(ctx storage.Context) int { netmapContractAddr := storage.Get(ctx, netmapKey).(interop.Hash160) return contract.Call(netmapContractAddr, "epoch", contract.ReadOnly).(int) } func name(ctx storage.Context) string { return storage.Get(ctx, nameKey).(string) } func index(ctx storage.Context) int { return storage.Get(ctx, indexKey).(int) } func checkPermission(ir []common.IRNode) bool { ctx := storage.GetReadOnlyContext() index := index(ctx) // read from contract memory if len(ir) <= index { return false } node := ir[index] return runtime.CheckWitness(node.PublicKey) } // Emit method produces side chain GAS and distributes it among Inner Ring nodes // and proxy contract. Can be invoked only by Alphabet node of the Inner Ring. // // To produce GAS, alphabet contract transfers all available NEO from contract // account to itself. If notary enabled, then 50% of the GAS in the contract account // transferred to proxy contract. 43.75% of the GAS are equally distributed // among all Inner Ring nodes. Remaining 6.25% of the GAS stays in the contract. // // If notary disabled, then 87.5% of the GAS are equally distributed among all // Inner Ring nodes. Remaining 12.5% of the GAS stays in the contract. func Emit() { ctx := storage.GetReadOnlyContext() notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool) alphabet := common.AlphabetNodes() if !checkPermission(alphabet) { panic("invalid invoker") } contractHash := runtime.GetExecutingScriptHash() neo.Transfer(contractHash, contractHash, neo.BalanceOf(contractHash), nil) gasBalance := gas.BalanceOf(contractHash) if !notaryDisabled { proxyAddr := storage.Get(ctx, proxyKey).(interop.Hash160) proxyGas := gasBalance / 2 if proxyGas == 0 { panic("no gas to emit") } gas.Transfer(contractHash, proxyAddr, proxyGas, nil) gasBalance -= proxyGas runtime.Log("utility token has been emitted to proxy contract") } var innerRing []common.IRNode if notaryDisabled { netmapContract := storage.Get(ctx, netmapKey).(interop.Hash160) innerRing = common.InnerRingNodesFromNetmap(netmapContract) } else { innerRing = common.InnerRingNodes() } gasPerNode := gasBalance * 7 / 8 / len(innerRing) if gasPerNode != 0 { for _, node := range innerRing { address := contract.CreateStandardAccount(node.PublicKey) gas.Transfer(contractHash, address, gasPerNode, nil) } runtime.Log("utility token has been emitted to inner ring nodes") } } // Vote method votes for side chain committee. Requires multisignature from // Alphabet nodes of the Inner Ring. // // This method is used when governance changes list of Alphabet nodes of the // Inner Ring. Alphabet nodes share keys with side chain validators, therefore // it is required to change them as well. To do that NEO holders, which are // alphabet contracts, should vote for new committee. func Vote(epoch int, candidates []interop.PublicKey) { ctx := storage.GetContext() notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool) index := index(ctx) name := name(ctx) var ( // for invocation collection without notary alphabet []common.IRNode nodeKey []byte ) if notaryDisabled { alphabet = common.AlphabetNodes() nodeKey = common.InnerRingInvoker(alphabet) if len(nodeKey) == 0 { panic("invalid invoker") } } else { multiaddr := common.AlphabetAddress() common.CheckAlphabetWitness(multiaddr) } curEpoch := currentEpoch(ctx) if epoch != curEpoch { panic("invalid epoch") } candidate := candidates[index%len(candidates)] address := runtime.GetExecutingScriptHash() if notaryDisabled { threshold := len(alphabet)*2/3 + 1 id := voteID(epoch, candidates) n := common.Vote(ctx, id, nodeKey) if n < threshold { return } common.RemoveVotes(ctx, id) } ok := neo.Vote(address, candidate) if ok { runtime.Log(name + ": successfully voted for validator") } else { runtime.Log(name + ": vote has been failed") } return } func voteID(epoch interface{}, args []interop.PublicKey) []byte { var ( result []byte epochBytes = epoch.([]byte) ) result = append(result, epochBytes...) for i := range args { result = append(result, args[i]...) } return crypto.Sha256(result) } // Name returns Glagolitic name of the contract. func Name() string { ctx := storage.GetReadOnlyContext() return name(ctx) } // Version returns version of the contract. func Version() int { return common.Version }