261 lines
7 KiB
Go
261 lines
7 KiB
Go
package alphabet
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import (
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"github.com/nspcc-dev/neo-go/pkg/interop"
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"github.com/nspcc-dev/neo-go/pkg/interop/contract"
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"github.com/nspcc-dev/neo-go/pkg/interop/native/crypto"
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"github.com/nspcc-dev/neo-go/pkg/interop/native/gas"
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"github.com/nspcc-dev/neo-go/pkg/interop/native/management"
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"github.com/nspcc-dev/neo-go/pkg/interop/native/neo"
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"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
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"github.com/nspcc-dev/neo-go/pkg/interop/storage"
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"github.com/nspcc-dev/neofs-contract/common"
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)
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const (
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netmapKey = "netmapScriptHash"
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proxyKey = "proxyScriptHash"
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indexKey = "index"
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totalKey = "threshold"
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nameKey = "name"
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notaryDisabledKey = "notary"
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)
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// OnNEP17Payment is a callback for NEP-17 compatible native GAS and NEO
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// contracts.
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func OnNEP17Payment(from interop.Hash160, amount int, data interface{}) {
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caller := runtime.GetCallingScriptHash()
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if !common.BytesEqual(caller, []byte(gas.Hash)) && !common.BytesEqual(caller, []byte(neo.Hash)) {
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common.AbortWithMessage("alphabet contract accepts GAS and NEO only")
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}
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}
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func _deploy(data interface{}, isUpdate bool) {
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if isUpdate {
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return
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}
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args := data.(struct {
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notaryDisabled bool
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addrNetmap interop.Hash160
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addrProxy interop.Hash160
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name string
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index int
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total int
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})
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ctx := storage.GetContext()
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if len(args.addrNetmap) != interop.Hash160Len || !args.notaryDisabled && len(args.addrProxy) != interop.Hash160Len {
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panic("incorrect length of contract script hash")
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}
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storage.Put(ctx, netmapKey, args.addrNetmap)
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storage.Put(ctx, proxyKey, args.addrProxy)
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storage.Put(ctx, nameKey, args.name)
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storage.Put(ctx, indexKey, args.index)
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storage.Put(ctx, totalKey, args.total)
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// initialize the way to collect signatures
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storage.Put(ctx, notaryDisabledKey, args.notaryDisabled)
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if args.notaryDisabled {
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common.InitVote(ctx)
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runtime.Log(args.name + " notary disabled")
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}
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runtime.Log(args.name + " contract initialized")
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}
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// Update method updates contract source code and manifest. Can be invoked
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// only by committee.
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func Update(script []byte, manifest []byte, data interface{}) {
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if !common.HasUpdateAccess() {
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panic("only committee can update contract")
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}
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contract.Call(interop.Hash160(management.Hash), "update",
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contract.All, script, manifest, common.AppendVersion(data))
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runtime.Log("alphabet contract updated")
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}
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// GAS returns amount of side chain GAS stored in contract account.
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func Gas() int {
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return gas.BalanceOf(runtime.GetExecutingScriptHash())
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}
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// NEO returns amount of side chain NEO stored in contract account.
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func Neo() int {
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return neo.BalanceOf(runtime.GetExecutingScriptHash())
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}
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func currentEpoch(ctx storage.Context) int {
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netmapContractAddr := storage.Get(ctx, netmapKey).(interop.Hash160)
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return contract.Call(netmapContractAddr, "epoch", contract.ReadOnly).(int)
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}
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func name(ctx storage.Context) string {
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return storage.Get(ctx, nameKey).(string)
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}
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func index(ctx storage.Context) int {
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return storage.Get(ctx, indexKey).(int)
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}
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func checkPermission(ir []common.IRNode) bool {
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ctx := storage.GetReadOnlyContext()
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index := index(ctx) // read from contract memory
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if len(ir) <= index {
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return false
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}
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node := ir[index]
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return runtime.CheckWitness(node.PublicKey)
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}
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// Emit method produces side chain GAS and distributes it among Inner Ring nodes
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// and proxy contract. Can be invoked only by Alphabet node of the Inner Ring.
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//
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// To produce GAS, alphabet contract transfers all available NEO from contract
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// account to itself. If notary enabled, then 50% of the GAS in the contract account
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// transferred to proxy contract. 43.75% of the GAS are equally distributed
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// among all Inner Ring nodes. Remaining 6.25% of the GAS stays in the contract.
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//
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// If notary disabled, then 87.5% of the GAS are equally distributed among all
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// Inner Ring nodes. Remaining 12.5% of the GAS stays in the contract.
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func Emit() {
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ctx := storage.GetReadOnlyContext()
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notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
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alphabet := common.AlphabetNodes()
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if !checkPermission(alphabet) {
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panic("invalid invoker")
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}
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contractHash := runtime.GetExecutingScriptHash()
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neo.Transfer(contractHash, contractHash, neo.BalanceOf(contractHash), nil)
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gasBalance := gas.BalanceOf(contractHash)
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if !notaryDisabled {
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proxyAddr := storage.Get(ctx, proxyKey).(interop.Hash160)
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proxyGas := gasBalance / 2
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if proxyGas == 0 {
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panic("no gas to emit")
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}
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gas.Transfer(contractHash, proxyAddr, proxyGas, nil)
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gasBalance -= proxyGas
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runtime.Log("utility token has been emitted to proxy contract")
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}
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var innerRing []common.IRNode
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if notaryDisabled {
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netmapContract := storage.Get(ctx, netmapKey).(interop.Hash160)
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innerRing = common.InnerRingNodesFromNetmap(netmapContract)
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} else {
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innerRing = common.InnerRingNodes()
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}
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gasPerNode := gasBalance * 7 / 8 / len(innerRing)
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if gasPerNode != 0 {
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for _, node := range innerRing {
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address := contract.CreateStandardAccount(node.PublicKey)
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gas.Transfer(contractHash, address, gasPerNode, nil)
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}
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runtime.Log("utility token has been emitted to inner ring nodes")
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}
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}
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// Vote method votes for side chain committee. Requires multisignature from
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// Alphabet nodes of the Inner Ring.
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//
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// This method is used when governance changes list of Alphabet nodes of the
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// Inner Ring. Alphabet nodes share keys with side chain validators, therefore
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// it is required to change them as well. To do that NEO holders, which are
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// alphabet contracts, should vote for new committee.
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func Vote(epoch int, candidates []interop.PublicKey) {
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ctx := storage.GetContext()
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notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
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index := index(ctx)
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name := name(ctx)
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var ( // for invocation collection without notary
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alphabet []common.IRNode
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nodeKey []byte
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)
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if notaryDisabled {
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alphabet = common.AlphabetNodes()
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nodeKey = common.InnerRingInvoker(alphabet)
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if len(nodeKey) == 0 {
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panic("invalid invoker")
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}
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} else {
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multiaddr := common.AlphabetAddress()
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common.CheckAlphabetWitness(multiaddr)
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}
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curEpoch := currentEpoch(ctx)
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if epoch != curEpoch {
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panic("invalid epoch")
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}
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candidate := candidates[index%len(candidates)]
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address := runtime.GetExecutingScriptHash()
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if notaryDisabled {
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threshold := len(alphabet)*2/3 + 1
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id := voteID(epoch, candidates)
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n := common.Vote(ctx, id, nodeKey)
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if n < threshold {
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return
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}
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common.RemoveVotes(ctx, id)
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}
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ok := neo.Vote(address, candidate)
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if ok {
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runtime.Log(name + ": successfully voted for validator")
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} else {
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runtime.Log(name + ": vote has been failed")
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}
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return
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}
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func voteID(epoch interface{}, args []interop.PublicKey) []byte {
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var (
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result []byte
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epochBytes = epoch.([]byte)
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)
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result = append(result, epochBytes...)
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for i := range args {
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result = append(result, args[i]...)
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}
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return crypto.Sha256(result)
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}
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// Name returns Glagolitic name of the contract.
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func Name() string {
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ctx := storage.GetReadOnlyContext()
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return name(ctx)
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}
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// Version returns version of the contract.
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func Version() int {
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return common.Version
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}
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