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/runtime"
"github.com/nspcc-dev/neo-go/pkg/interop/storage"
"github.com/nspcc-dev/neo-go/pkg/interop/util"
"github.com/nspcc-dev/neofs-contract/common"
)
type (
irNode struct {
key []byte
}
)
const (
// native gas token script hash
gasHash = "\xfb\xed\xfe\x2e\xd2\x22\x65\x92\xb6\x48\xc4\xda\x97\xb9\xc9\xcd\x5d\xc1\xa6\xa6"
// native neo token script hash
neoHash = "\xb6\x72\x0f\xef\x7e\x7e\xb7\x3f\x25\xaf\xb4\x70\xf5\x87\x99\x7c\xe3\xe2\x46\x0a"
netmapKey = "netmapScriptHash"
indexKey = "index"
totalKey = "threshold"
nameKey = "name"
voteKey = "ballots"
)
var (
ctx storage.Context
)
func init() {
if runtime.GetTrigger() != runtime.Application {
panic("contract has not been called in application node")
}
ctx = storage.GetContext()
}
// OnPayment is a callback for NEP-17 compatible native GAS and NEO contracts.
func OnPayment(from interop.Hash160, amount int, data interface{}) {
caller := runtime.GetCallingScriptHash()
if !bytesEqual(caller, []byte(gasHash)) && !bytesEqual(caller, []byte(neoHash)) {
panic("onPayment: 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)
setSerialized(ctx, voteKey, []common.Ballot{})
runtime.Log(name + " contract initialized")
}
func Gas() int {
contractHash := runtime.GetExecutingScriptHash()
return balance(gasHash, contractHash)
}
func Neo() int {
contractHash := runtime.GetExecutingScriptHash()
return balance(neoHash, contractHash)
}
func balance(hash string, addr []byte) int {
balance := contract.Call([]byte(hash), "balanceOf", addr)
return balance.(int)
}
func irList() []irNode {
netmapContractAddr := storage.Get(ctx, netmapKey).([]byte)
return contract.Call(netmapContractAddr, "innerRingList").([]irNode)
}
func currentEpoch() int {
netmapContractAddr := storage.Get(ctx, netmapKey).([]byte)
return contract.Call(netmapContractAddr, "epoch").(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 []irNode) bool {
index := index() // read from contract memory
if len(ir) <= index {
return false
}
node := ir[index]
return runtime.CheckWitness(node.key)
}
func innerRingInvoker(ir []irNode) []byte {
amountOfContracts := total() // read from contract memory
for i := 0; i < len(ir); i++ {
if i >= amountOfContracts {
return nil
}
node := ir[i]
if runtime.CheckWitness(node.key) {
return node.key
}
}
return nil
}
func Emit() bool {
innerRingKeys := irList()
if !checkPermission(innerRingKeys) {
panic("invalid invoker")
}
contractHash := runtime.GetExecutingScriptHash()
neo := balance(neoHash, contractHash)
_ = contract.Call([]byte(neoHash), "transfer", contractHash, contractHash, neo, nil)
gas := balance(gasHash, contractHash)
gasPerNode := gas * 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.key)
_ = contract.Call([]byte(gasHash), "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 := 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 := contract.Call([]byte(neoHash), "vote", address, candidate).(bool)
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 bytesEqual(cnd.ID, id) {
voters := cnd.Voters
for j := range voters {
if 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
}
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 !bytesEqual(cnd.ID, id) {
newCandidates = append(newCandidates, cnd)
}
}
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 setSerialized(ctx storage.Context, key interface{}, value interface{}) {
data := binary.Serialize(value)
storage.Put(ctx, key, data)
}
// neo-go#1176
func bytesEqual(a []byte, b []byte) bool {
return util.Equals(string(a), string(b))
}
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)
}