frostfs-contract/neofs_contract.go
2020-07-16 17:54:06 +03:00

652 lines
16 KiB
Go

package smart_contract
import (
"github.com/nspcc-dev/neo-go/pkg/interop/binary"
"github.com/nspcc-dev/neo-go/pkg/interop/blockchain"
"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/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
}
node struct {
pub []byte
}
cheque struct {
id []byte
}
)
const (
tokenHash = "\x3b\x7d\x37\x11\xc6\xf0\xcc\xf9\xb1\xdc\xa9\x03\xd1\xbf\xa1\xd8\x96\xf1\x23\x8c"
innerRingCandidateFee = 100 * 1_0000_0000 // 100 Fixed8 Gas
version = 2
innerRingKey = "innerring"
voteKey = "ballots"
candidatesKey = "candidates"
cashedChequesKey = "cheques"
blockDiff = 20 // change base on performance evaluation
publicKeySize = 33
minInnerRingSize = 3
)
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
*/
ctx := storage.GetContext()
switch op {
case "Init":
if storage.Get(ctx, innerRingKey) != nil {
panic("neofs: contract already deployed")
}
var irList []node
for i := 0; i < len(args); i++ {
pub := args[i].([]byte)
irList = append(irList, node{pub: pub})
}
// initialize all storage slices
setSerialized(ctx, innerRingKey, irList)
setSerialized(ctx, voteKey, []ballot{})
setSerialized(ctx, candidatesKey, []node{})
setSerialized(ctx, cashedChequesKey, []cheque{})
runtime.Log("neofs: contract initialized")
return true
case "InnerRingList":
return getInnerRingNodes(ctx, innerRingKey)
case "InnerRingCandidates":
return getInnerRingNodes(ctx, candidatesKey)
case "InnerRingCandidateRemove":
if len(args) != 1 {
panic("irCandidateRemove: bad arguments")
}
key := args[0].([]byte) // inner ring candidate public key
if !runtime.CheckWitness(key) {
panic("irCandidateRemove: you should be the owner of the public key")
}
nodes := []node{} // it is explicit declaration of empty slice, not nil
candidates := getInnerRingNodes(ctx, candidatesKey)
for i := range candidates {
c := candidates[i]
if !bytesEqual(c.pub, key) {
nodes = append(nodes, c)
} else {
runtime.Log("irCandidateRemove: candidate has been removed")
}
}
setSerialized(ctx, candidatesKey, nodes)
return true
case "InnerRingCandidateAdd":
if len(args) != 1 {
panic("irCandidateAdd: bad arguments")
}
key := args[0].([]byte) // inner ring candidate public key
if !runtime.CheckWitness(key) {
panic("irCandidateAdd: you should be the owner of the public key")
}
c := node{pub: key}
candidates := getInnerRingNodes(ctx, candidatesKey)
list, ok := addNode(candidates, c)
if !ok {
panic("irCandidateAdd: candidate already in the list")
}
from := contract.CreateStandardAccount(key)
to := runtime.GetExecutingScriptHash()
params := []interface{}{from, to, innerRingCandidateFee}
transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
if !transferred {
panic("irCandidateAdd: failed to transfer funds, aborting")
}
runtime.Log("irCandidateAdd: candidate has been added")
setSerialized(ctx, candidatesKey, list)
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")
}
amount := args[1].(int)
if amount > 0 {
amount = amount * 100000000
}
to := runtime.GetExecutingScriptHash()
params := []interface{}{from, to, amount}
transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
if !transferred {
panic("deposit: failed to transfer funds, aborting")
}
runtime.Log("deposit: funds have been transferred")
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)
return true
case "Withdraw":
if len(args) != 2 {
panic("withdraw: bad arguments")
}
user := args[0].([]byte)
if !runtime.CheckWitness(user) {
panic("withdraw: you should be the owner of the wallet")
}
amount := args[1].(int)
if amount > 0 {
amount = amount * 100000000
}
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 balance contract
irList := getInnerRingNodes(ctx, innerRingKey)
threshold := len(irList)/3*2 + 1
cashedCheques := getCashedCheques(ctx)
hashID := crypto.SHA256(id)
irKey := innerRingInvoker(irList)
if len(irKey) == 0 {
panic("cheque: invoked by non inner ring node")
}
c := cheque{id: id}
list, ok := addCheque(cashedCheques, c)
if !ok {
panic("cheque: non unique id")
}
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")
}
runtime.Log("cheque: funds have been transferred")
setSerialized(ctx, cashedChequesKey, list)
runtime.Notify("Cheque", id, user, amount, lockAcc)
}
return true
case "Bind", "Unbind":
if len(args) < 2 {
panic("binding: bad arguments")
}
user := args[0].([]byte)
if !runtime.CheckWitness(user) {
panic("binding: you should be the owner of the wallet")
}
var keys [][]byte
for i := 1; i < len(args); i++ {
pub := args[i].([]byte)
if len(pub) != publicKeySize {
panic("binding: incorrect public key size")
}
keys = append(keys, pub)
}
runtime.Notify(op, user, keys)
return true
case "InnerRingUpdate":
if len(args) < 1+minInnerRingSize {
// cheque id + inner ring public keys
panic("irUpdate: bad arguments")
}
irList := getInnerRingNodes(ctx, innerRingKey)
threshold := len(irList)/3*2 + 1
irKey := innerRingInvoker(irList)
if len(irKey) == 0 {
panic("innerRingUpdate: invoked by non inner ring node")
}
id := args[0].([]byte)
c := cheque{id: id}
cashedCheques := getCashedCheques(ctx)
chequesList, ok := addCheque(cashedCheques, c)
if !ok {
panic("irUpdate: non unique id")
}
oldNodes := 0
candidates := getInnerRingNodes(ctx, candidatesKey)
newIR := []node{}
loop:
for i := 1; i < len(args); i++ {
key := args[i].([]byte)
if len(key) != publicKeySize {
panic("irUpdate: invalid public key in inner ring list")
}
// find key in actual inner ring list
for j := 0; j < len(irList); j++ {
n := irList[j]
if bytesEqual(n.pub, key) {
newIR = append(newIR, n)
oldNodes++
continue loop
}
}
// find key in candidates list
candidates, newIR, ok = rmNodeByKey(candidates, newIR, key)
if !ok {
panic("irUpdate: unknown public key in inner ring list")
}
}
if oldNodes < len(newIR)*2/3+1 {
panic("irUpdate: inner ring change rate must not be more than 1/3 ")
}
hashID := crypto.SHA256(id)
n := vote(ctx, hashID, irKey)
if n >= threshold {
removeVotes(ctx, hashID)
setSerialized(ctx, candidatesKey, candidates)
setSerialized(ctx, innerRingKey, newIR)
setSerialized(ctx, cashedChequesKey, chequesList)
runtime.Notify("InnerRingUpdate", c.id, newIR)
runtime.Log("irUpdate: inner ring list has been updated")
}
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 := getInnerRingNodes(ctx, innerRingKey)
for i := range irList {
node := irList[i]
if bytesEqual(node.pub, key) {
return true
}
}
return false
case "Version":
return version
}
panic("unknown operation")
}
// fixme: use strict type deserialization wrappers
func getSerialized(ctx storage.Context, key string) interface{} {
data := storage.Get(ctx, key).([]byte)
if len(data) != 0 {
return binary.Deserialize(data)
}
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)
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)
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{})
}
lst = append(lst, value)
data = binary.Serialize(lst)
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}
}
func containsCheck(lst []cheque, c cheque) bool {
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)
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)
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 = getBallots(ctx)
found = -1
blockHeight = blockchain.GetHeight()
)
for i := 0; i < len(candidates); i++ {
cnd := candidates[i]
if bytesEqual(cnd.id, id) {
voters := cnd.n
for j := range voters {
if bytesEqual(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 {
found = 1
voters := [][]byte{from}
newCandidates = append(newCandidates, ballot{
id: id,
n: voters,
block: blockHeight})
}
setSerialized(ctx, voteKey, newCandidates)
return found
}
func removeVotes(ctx storage.Context, id []byte) {
var (
newCandidates []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)
}
// setSerialized serializes data and puts it into contract storage.
func setSerialized(ctx storage.Context, key interface{}, value interface{}) {
data := binary.Serialize(value)
storage.Put(ctx, key, data)
}
// getInnerRingNodes returns deserialized slice of inner ring nodes from storage.
func getInnerRingNodes(ctx storage.Context, key string) []node {
data := storage.Get(ctx, key)
if data != nil {
return binary.Deserialize(data.([]byte)).([]node)
}
return []node{}
}
// getInnerRingNodes returns deserialized slice of used cheques.
func getCashedCheques(ctx storage.Context) []cheque {
data := storage.Get(ctx, cashedChequesKey)
if data != nil {
return binary.Deserialize(data.([]byte)).([]cheque)
}
return []cheque{}
}
// getInnerRingNodes returns deserialized slice of vote ballots.
func getBallots(ctx storage.Context) []ballot {
data := storage.Get(ctx, voteKey)
if data != nil {
return binary.Deserialize(data.([]byte)).([]ballot)
}
return []ballot{}
}
// addCheque returns slice of cheques with appended cheque 'c' and bool flag
// that set to false if cheque 'c' is already presented in the slice 'lst'.
func addCheque(lst []cheque, c cheque) ([]cheque, bool) {
for i := 0; i < len(lst); i++ {
if bytesEqual(c.id, lst[i].id) {
return nil, false
}
}
lst = append(lst, c)
return lst, true
}
// addNode returns slice of nodes with appended node 'n' and bool flag
// that set to false if node 'n' is already presented in the slice 'lst'.
func addNode(lst []node, n node) ([]node, bool) {
for i := 0; i < len(lst); i++ {
if bytesEqual(n.pub, lst[i].pub) {
return nil, false
}
}
lst = append(lst, n)
return lst, true
}
// rmNodeByKey returns slice of nodes without node with key 'k',
// slices of nodes 'add' with node with key 'k' and bool flag,
// that set to false if node with a key 'k' does not exists in the slice 'lst'.
func rmNodeByKey(lst, add []node, k []byte) ([]node, []node, bool) {
var (
flag bool
newLst = []node{} // it is explicit declaration of empty slice, not nil
)
for i := 0; i < len(lst); i++ {
if bytesEqual(k, lst[i].pub) {
add = append(add, lst[i])
flag = true
} else {
newLst = append(newLst, lst[i])
}
}
return newLst, add, flag
}
// bytesEqual compares two slice of bytes by wrapping them into strings,
// which is necessary with new util.Equal interop behaviour, see neo-go#1176.
func bytesEqual(a []byte, b []byte) bool {
return util.Equals(string(a), string(b))
}