frostfs-contract/neofs_contract.go

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package smart_contract
import (
"github.com/nspcc-dev/neo-go/pkg/interop/binary"
"github.com/nspcc-dev/neo-go/pkg/interop/blockchain"
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"github.com/nspcc-dev/neo-go/pkg/interop/crypto"
"github.com/nspcc-dev/neo-go/pkg/interop/engine"
"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"
)
type (
ballot struct {
id []byte // id of the voting decision
n [][]byte // already voted inner ring nodes
block int // block with the last vote
}
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node struct {
pub []byte
}
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cheque struct {
id []byte
}
)
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const (
tokenHash = "\x3b\x7d\x37\x11\xc6\xf0\xcc\xf9\xb1\xdc\xa9\x03\xd1\xbf\xa1\xd8\x96\xf1\x23\x8c"
innerRingCandidateFee = 100 * 1000 * 1000 // 10^8
version = 2
voteKey = "ballots"
blockDiff = 20 // change base on performance evaluation
)
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func Main(op string, args []interface{}) interface{} {
// The trigger determines whether this smart-contract is being
// run in 'verification' or 'application' mode.
if runtime.GetTrigger() != runtime.Application() {
return false
}
/*
Utility operations - they will be changed in production:
- Deploy(params: address, pubKey, ... ) - setup initial inner ring state
User operations:
- InnerRingList() - get list of inner ring nodes addresses and public keys
- InnerRingCandidateRemove(params: pubKey) - remove node with given public key from the inner ring candidate queue
- InnerRingCandidateAdd(params: pubKey) - add node to the inner ring candidate queue
- Deposit(params: pubKey, amount) - deposit GAS to the NeoFS account
- Withdraw(params: withdrawCheque) - withdraw GAS from the NeoFS account
- InnerRingUpdate(params: irCheque) - change list of inner ring nodes
- IsInnerRing(params: pubKey) - returns true if pubKey presented in inner ring list
- Version() - get version of the NeoFS smart-contract
Params:
- address - string of the valid multiaddress (github.com/multiformats/multiaddr)
- pubKey - 33 byte public key
- withdrawCheque - serialized structure, that confirms GAS transfer;
contains inner ring signatures
- irCheque - serialized structure, that confirms new inner ring node list;
contains inner ring signatures
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*/
ctx := storage.GetContext()
switch op {
case "Deploy":
irList := getSerialized(ctx, "InnerRingList").([]node)
if len(irList) >= 3 {
panic("contract already deployed")
}
irList = []node{}
for i := 0; i < len(args); i++ {
pub := args[i].([]byte)
irList = append(irList, node{pub: pub})
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}
data := binary.Serialize(irList)
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storage.Put(ctx, "InnerRingList", data)
data = binary.Serialize([]interface{}{})
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storage.Put(ctx, "UsedVerifCheckList", data)
storage.Put(ctx, "InnerRingCandidates", data)
data = binary.Serialize([]ballot{})
storage.Put(ctx, voteKey, data)
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return true
case "InnerRingList":
irList := getSerialized(ctx, "InnerRingList").([]node)
return irList
case "InnerRingCandidateRemove":
data := args[0].([]byte) // public key
if !runtime.CheckWitness(data) {
panic("you should be the owner of the public key")
}
delSerializedIR(ctx, "InnerRingCandidates", data)
return true
case "InnerRingCandidateAdd":
key := args[0].([]byte) // public key
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if !runtime.CheckWitness(key) {
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panic("you should be the owner of the public key")
}
candidates := getSerialized(ctx, "InnerRingCandidates").([]node)
if containsPub(candidates, key) {
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panic("is already in list")
}
from := pubToScriptHash(key)
to := runtime.GetExecutingScriptHash()
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params := []interface{}{from, to, innerRingCandidateFee}
transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
if !transferred {
panic("failed to transfer funds, aborting")
}
candidate := node{pub: key}
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if !putSerialized(ctx, "InnerRingCandidates", candidate) {
panic("failed to put candidate into the queue")
}
return true
case "Deposit":
if len(args) < 2 || len(args) > 3 {
panic("deposit: bad arguments")
}
from := args[0].([]byte)
if !runtime.CheckWitness(from) {
panic("deposit: you should be the owner of the wallet")
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}
amount := args[1].(int)
if amount > 0 {
amount = amount * 100000000
}
to := runtime.GetExecutingScriptHash()
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params := []interface{}{from, to, amount}
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transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
if !transferred {
panic("deposit: failed to transfer funds, aborting")
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}
runtime.Log("deposit: funds have been transferred")
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var rcv = from
if len(args) == 3 {
rcv = args[2].([]byte) // todo: check if rcv value is valid
}
tx := runtime.GetScriptContainer()
runtime.Notify("Deposit", from, amount, rcv, tx.Hash)
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return true
case "Withdraw":
if len(args) != 2 {
panic("withdraw: bad arguments")
}
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user := args[0].([]byte)
if !runtime.CheckWitness(user) {
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panic("withdraw: you should be the owner of the wallet")
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}
amount := args[1].(int)
if amount > 0 {
amount = amount * 100000000
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}
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tx := runtime.GetScriptContainer()
runtime.Notify("Withdraw", user, amount, tx.Hash)
return true
case "Cheque":
if len(args) != 4 {
panic("cheque: bad arguments")
}
id := args[0].([]byte) // unique cheque id
user := args[1].([]byte) // GAS receiver
amount := args[2].(int) // amount of GAS
lockAcc := args[3].([]byte) // lock account from internal banking that must be cashed out
ctx := storage.GetContext()
hashID := crypto.SHA256(id)
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irList := getSerialized(ctx, "InnerRingList").([]node)
usedList := getSerialized(ctx, "UsedVerifCheckList").([]cheque)
threshold := len(irList)/3*2 + 1
irKey := innerRingInvoker(irList)
if len(irKey) == 0 {
panic("cheque: invoked by non inner ring node")
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}
c := cheque{id: id} // todo: use different cheque id for inner ring update and withdraw
if containsCheck(usedList, c) {
panic("cheque: non unique id")
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}
n := vote(ctx, hashID, irKey)
if n >= threshold {
removeVotes(ctx, hashID)
from := runtime.GetExecutingScriptHash()
params := []interface{}{from, user, amount}
transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
if !transferred {
panic("cheque: failed to transfer funds, aborting")
}
putSerialized(ctx, "UsedVerifCheckList", c)
runtime.Notify("Cheque", id, user, amount, lockAcc)
}
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return true
case "InnerRingUpdate":
data := args[0].([]byte)
id := data[:8]
var ln interface{} = data[8:10]
listItemCount := ln.(int)
listSize := listItemCount * 33
offset := 8 + 2 + listSize
irList := getSerialized(ctx, "InnerRingList").([]node)
usedList := getSerialized(ctx, "UsedVerifCheckList").([]cheque)
threshold := len(irList)/3*2 + 1
irKey := innerRingInvoker(irList)
if len(irKey) == 0 {
panic("innerRingUpdate: invoked by non inner ring node")
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}
c := cheque{id: id}
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if containsCheck(usedList, c) {
panic("innerRingUpdate: cheque has non unique id")
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}
chequeHash := crypto.SHA256(data)
n := vote(ctx, chequeHash, irKey)
if n >= threshold {
removeVotes(ctx, chequeHash)
candidates := getSerialized(ctx, "InnerRingCandidates").([]node)
offset = 10
newIR := []node{}
loop:
for i := 0; i < listItemCount; i, offset = i+1, offset+33 {
pub := data[offset : offset+33]
for j := 0; j < len(irList); j++ {
n := irList[j]
if util.Equals(n.pub, pub) {
newIR = append(newIR, n)
continue loop
}
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}
for j := 0; j < len(candidates); j++ {
n := candidates[j]
if util.Equals(n.pub, pub) {
newIR = append(newIR, n)
continue loop
}
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}
}
if len(newIR) != listItemCount {
panic("new inner ring wasn't processed correctly")
}
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for i := 0; i < len(newIR); i++ {
n := newIR[i]
delSerializedIR(ctx, "InnerRingCandidates", n.pub)
}
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newIRData := binary.Serialize(newIR)
storage.Put(ctx, "InnerRingList", newIRData)
putSerialized(ctx, "UsedVerifCheckList", c)
runtime.Notify("InnerRingUpdate", c.id, newIRData)
}
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return true
case "IsInnerRing":
if len(args) != 1 {
panic("isInnerRing: wrong arguments")
}
key := args[0].([]byte)
if len(key) != 33 {
panic("isInnerRing: incorrect public key")
}
irList := getSerialized(ctx, "InnerRingList").([]node)
for i := range irList {
node := irList[i]
if util.Equals(node.pub, key) {
return true
}
}
return false
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case "Version":
return version
}
panic("unknown operation")
}
// fixme: use strict type deserialization wrappers
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func getSerialized(ctx storage.Context, key string) interface{} {
data := storage.Get(ctx, key).([]byte)
if len(data) != 0 {
return binary.Deserialize(data)
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}
return nil
}
func delSerialized(ctx storage.Context, key string, value []byte) bool {
data := storage.Get(ctx, key).([]byte)
deleted := false
var newList [][]byte
if len(data) != 0 {
lst := binary.Deserialize(data).([][]byte)
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for i := 0; i < len(lst); i++ {
if util.Equals(value, lst[i]) {
deleted = true
} else {
newList = append(newList, lst[i])
}
}
if deleted {
if len(newList) != 0 {
data := binary.Serialize(newList)
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storage.Put(ctx, key, data)
} else {
storage.Delete(ctx, key)
}
runtime.Log("target element has been removed")
return true
}
}
runtime.Log("target element has not been removed")
return false
}
func putSerialized(ctx storage.Context, key string, value interface{}) bool {
data := storage.Get(ctx, key).([]byte)
var lst []interface{}
if len(data) != 0 {
lst = binary.Deserialize(data).([]interface{})
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}
lst = append(lst, value)
data = binary.Serialize(lst)
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storage.Put(ctx, key, data)
return true
}
func pubToScriptHash(pkey []byte) []byte {
// pre := []byte{0x21}
// buf := append(pre, pkey...)
// buf = append(buf, 0xac)
// h := crypto.Hash160(buf)
//
// return h
// fixme: someday ripemd syscall will appear
// or simply store script-hashes along with public key
return []byte{0x0F, 0xED}
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}
func containsCheck(lst []cheque, c cheque) bool {
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for i := 0; i < len(lst); i++ {
if util.Equals(c, lst[i]) {
return true
}
}
return false
}
func containsPub(lst []node, elem []byte) bool {
for i := 0; i < len(lst); i++ {
e := lst[i]
if util.Equals(elem, e.pub) {
return true
}
}
return false
}
func delSerializedIR(ctx storage.Context, key string, value []byte) bool {
data := storage.Get(ctx, key).([]byte)
deleted := false
newList := []node{}
if len(data) != 0 {
lst := binary.Deserialize(data).([]node)
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for i := 0; i < len(lst); i++ {
n := lst[i]
if util.Equals(value, n.pub) {
deleted = true
} else {
newList = append(newList, n)
}
}
if deleted {
data := binary.Serialize(newList)
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storage.Put(ctx, key, data)
runtime.Log("target element has been removed")
return true
}
}
runtime.Log("target element has not been removed")
return false
}
// innerRingInvoker returns public key of inner ring node that invoked contract.
func innerRingInvoker(ir []node) []byte {
for i := 0; i < len(ir); i++ {
node := ir[i]
if runtime.CheckWitness(node.pub) {
return node.pub
}
}
return nil
}
func vote(ctx storage.Context, id, from []byte) int {
var (
newCandidates []ballot
candidates = getSerialized(ctx, voteKey).([]ballot)
found = -1
blockHeight = blockchain.GetHeight()
)
for i := 0; i < len(candidates); i++ {
cnd := candidates[i]
if util.Equals(cnd.id, id) {
voters := cnd.n
for j := range voters {
if util.Equals(voters[j], from) {
return len(voters)
}
}
voters = append(voters, from)
cnd = ballot{id: id, n: voters, block: blockHeight}
found = len(voters)
}
// do not add old ballots, they are invalid
if blockHeight-cnd.block <= blockDiff {
newCandidates = append(newCandidates, cnd)
}
}
if found < 0 {
voters := [][]byte{from}
newCandidates = append(newCandidates, ballot{
id: id,
n: voters,
block: blockHeight})
found = 1
}
data := binary.Serialize(newCandidates)
storage.Put(ctx, voteKey, data)
return found
}
func removeVotes(ctx storage.Context, id []byte) {
var (
newCandidates = []ballot{}
candidates = getSerialized(ctx, voteKey).([]ballot)
)
for i := 0; i < len(candidates); i++ {
cnd := candidates[i]
if !util.Equals(cnd.id, id) {
newCandidates = append(newCandidates, cnd)
}
}
data := binary.Serialize(newCandidates)
storage.Put(ctx, voteKey, data)
}