frostfs-contract/alphabet/alphabet_contract.go

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package alphabet
import (
"git.frostfs.info/TrueCloudLab/frostfs-contract/common"
"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/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"
)
const (
netmapKey = "netmapScriptHash"
proxyKey = "proxyScriptHash"
indexKey = "index"
totalKey = "threshold"
nameKey = "name"
)
// 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)) {
common.AbortWithMessage("alphabet contract accepts GAS and NEO only")
}
}
func _deploy(data interface{}, isUpdate bool) {
ctx := storage.GetContext()
if isUpdate {
args := data.([]interface{})
common.CheckVersion(args[len(args)-1].(int))
return
}
args := data.(struct {
addrNetmap interop.Hash160
addrProxy interop.Hash160
name string
index int
total int
})
if len(args.addrNetmap) != interop.Hash160Len || len(args.addrProxy) != interop.Hash160Len {
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)
runtime.Log(args.name + " contract initialized")
}
// Update method updates contract source code and manifest. It can be invoked
// only by committee.
func Update(script []byte, manifest []byte, data interface{}) {
if !common.HasUpdateAccess() {
panic("only committee can update contract")
}
management.UpdateWithData(script, manifest, common.AppendVersion(data))
runtime.Log("alphabet contract updated")
}
// GAS returns the amount of the sidechain GAS stored in the contract account.
func Gas() int {
return gas.BalanceOf(runtime.GetExecutingScriptHash())
}
// NEO returns the amount of sidechain NEO stored in the 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 []interop.PublicKey) bool {
ctx := storage.GetReadOnlyContext()
index := index(ctx) // read from contract memory
if len(ir) <= index {
return false
}
node := ir[index]
return runtime.CheckWitness(node)
}
// Emit method produces sidechain GAS and distributes it among Inner Ring nodes
// and proxy contract. It can be invoked only by an Alphabet node of the Inner Ring.
//
// To produce GAS, an alphabet contract transfers all available NEO from the contract
// account to itself. 50% of the GAS in the contract account
// are transferred to proxy contract. 43.75% of the GAS are equally distributed
// among all Inner Ring nodes. Remaining 6.25% of the GAS stay in the contract.
func Emit() {
ctx := storage.GetReadOnlyContext()
alphabet := common.AlphabetNodes()
if !checkPermission(alphabet) {
panic("invalid invoker")
}
contractHash := runtime.GetExecutingScriptHash()
if !neo.Transfer(contractHash, contractHash, neo.BalanceOf(contractHash), nil) {
panic("failed to transfer funds, aborting")
}
gasBalance := gas.BalanceOf(contractHash)
proxyAddr := storage.Get(ctx, proxyKey).(interop.Hash160)
proxyGas := gasBalance / 2
if proxyGas == 0 {
panic("no gas to emit")
}
if !gas.Transfer(contractHash, proxyAddr, proxyGas, nil) {
runtime.Log("could not transfer GAS to proxy contract")
}
gasBalance -= proxyGas
runtime.Log("utility token has been emitted to proxy contract")
innerRing := common.InnerRingNodes()
gasPerNode := gasBalance * 7 / 8 / len(innerRing)
if gasPerNode != 0 {
for _, node := range innerRing {
address := contract.CreateStandardAccount(node)
if !gas.Transfer(contractHash, address, gasPerNode, nil) {
runtime.Log("could not transfer GAS to one of IR node")
}
}
runtime.Log("utility token has been emitted to inner ring nodes")
}
}
// Vote method votes for the sidechain committee. It requires multisignature from
// Alphabet nodes of the Inner Ring.
//
// This method is used when governance changes the list of Alphabet nodes of the
// Inner Ring. Alphabet nodes share keys with sidechain validators, therefore
// it is required to change them as well. To do that, NEO holders (which are
// alphabet contracts) should vote for a new committee.
func Vote(epoch int, candidates []interop.PublicKey) {
ctx := storage.GetContext()
index := index(ctx)
name := name(ctx)
common.CheckAlphabetWitness()
curEpoch := currentEpoch(ctx)
if epoch != curEpoch {
panic("invalid epoch")
}
candidate := candidates[index%len(candidates)]
address := runtime.GetExecutingScriptHash()
ok := neo.Vote(address, candidate)
if ok {
runtime.Log(name + ": successfully voted for validator")
} else {
runtime.Log(name + ": vote has been failed")
}
}
// Name returns the Glagolitic name of the contract.
func Name() string {
ctx := storage.GetReadOnlyContext()
return name(ctx)
}
// Version returns the version of the contract.
func Version() int {
return common.Version
}