frostfs-contract/alphabet/alphabet_contract.go

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package alphabetcontract
import (
"github.com/nspcc-dev/neo-go/pkg/interop"
"github.com/nspcc-dev/neo-go/pkg/interop/binary"
"github.com/nspcc-dev/neo-go/pkg/interop/contract"
"github.com/nspcc-dev/neo-go/pkg/interop/crypto"
"github.com/nspcc-dev/neo-go/pkg/interop/native/gas"
"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"
indexKey = "index"
totalKey = "threshold"
nameKey = "name"
voteKey = "ballots"
)
var ctx storage.Context
func init() {
ctx = storage.GetContext()
}
// 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("onNEP17Payment: alphabet contract accepts GAS and NEO only")
}
}
func Init(addrNetmap []byte, name string, index, total int) {
if storage.Get(ctx, netmapKey) != nil {
panic("contract already deployed")
}
if len(addrNetmap) != 20 {
panic("incorrect length of contract script hash")
}
storage.Put(ctx, netmapKey, addrNetmap)
storage.Put(ctx, nameKey, name)
storage.Put(ctx, indexKey, index)
storage.Put(ctx, totalKey, total)
common.SetSerialized(ctx, voteKey, []common.Ballot{})
runtime.Log(name + " contract initialized")
}
func Gas() int {
return gas.BalanceOf(runtime.GetExecutingScriptHash())
}
func Neo() int {
return neo.BalanceOf(runtime.GetExecutingScriptHash())
}
func irList() []common.IRNode {
return common.InnerRingListViaStorage(ctx, netmapKey)
}
func currentEpoch() int {
netmapContractAddr := storage.Get(ctx, netmapKey).([]byte)
return contract.Call(netmapContractAddr, "epoch", contract.ReadOnly).(int)
}
func name() string {
return storage.Get(ctx, nameKey).(string)
}
func index() int {
return storage.Get(ctx, indexKey).(int)
}
func total() int {
return storage.Get(ctx, totalKey).(int)
}
func checkPermission(ir []common.IRNode) bool {
index := index() // read from contract memory
if len(ir) <= index {
return false
}
node := ir[index]
return runtime.CheckWitness(node.PublicKey)
}
func Emit() bool {
innerRingKeys := irList()
if !checkPermission(innerRingKeys) {
panic("invalid invoker")
}
contractHash := runtime.GetExecutingScriptHash()
_ = neo.Transfer(contractHash, contractHash, neo.BalanceOf(contractHash), nil)
gasBalance := gas.BalanceOf(contractHash)
gasPerNode := gasBalance * 7 / 8 / len(innerRingKeys)
if gasPerNode == 0 {
runtime.Log("no gas to emit")
return false
}
for i := range innerRingKeys {
node := innerRingKeys[i]
address := contract.CreateStandardAccount(node.PublicKey)
_ = gas.Transfer(contractHash, address, gasPerNode, nil)
}
runtime.Log("utility token has been emitted to inner ring nodes")
return true
}
func Vote(epoch int, candidates [][]byte) {
innerRingKeys := irList()
threshold := total()/3*2 + 1
index := index()
name := name()
key := common.InnerRingInvoker(innerRingKeys)
if len(key) == 0 {
panic("invalid invoker")
}
curEpoch := currentEpoch()
if epoch != curEpoch {
panic("invalid epoch")
}
id := voteID(epoch, candidates)
n := vote(ctx, curEpoch, id, key)
if n >= threshold {
candidate := candidates[index%len(candidates)]
address := runtime.GetExecutingScriptHash()
ok := neo.Vote(address, candidate)
if ok {
runtime.Log(name + ": successfully voted for validator")
removeVotes(ctx, id)
} else {
runtime.Log(name + ": vote has been failed")
}
} else {
runtime.Log(name + ": saved vote for validator")
}
return
}
func Name() string {
return name()
}
func vote(ctx storage.Context, epoch int, id, from []byte) int {
var (
newCandidates []common.Ballot
candidates = getBallots(ctx)
found = -1
)
for i := 0; i < len(candidates); i++ {
cnd := candidates[i]
if common.BytesEqual(cnd.ID, id) {
voters := cnd.Voters
for j := range voters {
if common.BytesEqual(voters[j], from) {
return len(voters)
}
}
voters = append(voters, from)
cnd = common.Ballot{ID: id, Voters: voters, Height: epoch}
found = len(voters)
}
// add only valid ballots with current epochs
if cnd.Height == epoch {
newCandidates = append(newCandidates, cnd)
}
}
if found < 0 {
voters := [][]byte{from}
newCandidates = append(newCandidates, common.Ballot{
ID: id,
Voters: voters,
Height: epoch})
found = 1
}
common.SetSerialized(ctx, voteKey, newCandidates)
return found
}
func removeVotes(ctx storage.Context, id []byte) {
var (
newCandidates []common.Ballot
candidates = getBallots(ctx)
)
for i := 0; i < len(candidates); i++ {
cnd := candidates[i]
if !common.BytesEqual(cnd.ID, id) {
newCandidates = append(newCandidates, cnd)
}
}
common.SetSerialized(ctx, voteKey, newCandidates)
}
func getBallots(ctx storage.Context) []common.Ballot {
data := storage.Get(ctx, voteKey)
if data != nil {
return binary.Deserialize(data.([]byte)).([]common.Ballot)
}
return []common.Ballot{}
}
func voteID(epoch interface{}, args [][]byte) []byte {
var (
result []byte
epochBytes = epoch.([]byte)
)
result = append(result, epochBytes...)
for i := range args {
result = append(result, args[i]...)
}
return crypto.SHA256(result)
}