frostfs-contract/neofs/neofs_contract.go
Alex Vanin 23f5f1e0e7 [#63] Fix threshold number calculation
`x*2/3` is not equal to `x/3*2` with integers.
The only correct way to calculate threshold is
the first one.

Signed-off-by: Alex Vanin <alexey@nspcc.ru>
2021-03-25 21:22:27 +03:00

596 lines
14 KiB
Go

package smart_contract
/*
NeoFS Smart Contract for NEO3.0.
Utility methods, executed once in deploy stage:
- Init
- InitConfig
User related methods:
- Deposit
- Withdraw
- Bind
- Unbind
Inner ring list related methods:
- AlphabetList
- InnerRingCandidates
- InnerRingCandidateAdd
- InnerRingCandidateRemove
- AlphabetUpdate
Config methods:
- Config
- ListConfig
- SetConfig
Other utility methods:
- Version
- Cheque
*/
import (
"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/iterator"
"github.com/nspcc-dev/neo-go/pkg/interop/native/crypto"
"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/std"
"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
"github.com/nspcc-dev/neo-go/pkg/interop/storage"
"github.com/nspcc-dev/neofs-contract/common"
)
type (
cheque struct {
id []byte
}
record struct {
key []byte
val []byte
}
)
const (
defaultCandidateFee = 100 * 1_0000_0000 // 100 Fixed8 Gas
candidateFeeConfigKey = "InnerRingCandidateFee"
version = 3
alphabetKey = "alphabet"
candidatesKey = "candidates"
cashedChequesKey = "cheques"
publicKeySize = 33
maxBalanceAmount = 9000 // Max integer of Fixed12 in JSON bound (2**53-1)
// hardcoded value to ignore deposit notification in onReceive
ignoreDepositNotification = "\x57\x0b"
)
var (
configPrefix = []byte("config")
)
// Init set up initial alphabet node keys.
func Init(owner interop.PublicKey, args []interop.PublicKey) bool {
ctx := storage.GetContext()
if !common.HasUpdateAccess(ctx) {
panic("only owner can reinitialize contract")
}
var irList []common.IRNode
if len(args) == 0 {
panic("neofs: at least one alphabet key must be provided")
}
for i := 0; i < len(args); i++ {
pub := args[i]
if len(pub) != publicKeySize {
panic("neofs: incorrect public key length")
}
irList = append(irList, common.IRNode{PublicKey: pub})
}
// initialize all storage slices
common.SetSerialized(ctx, alphabetKey, irList)
common.InitVote(ctx)
common.SetSerialized(ctx, candidatesKey, []common.IRNode{})
common.SetSerialized(ctx, cashedChequesKey, []cheque{})
storage.Put(ctx, common.OwnerKey, owner)
runtime.Log("neofs: contract initialized")
return true
}
// Migrate updates smart contract execution script and manifest.
func Migrate(script []byte, manifest []byte) bool {
ctx := storage.GetReadOnlyContext()
if !common.HasUpdateAccess(ctx) {
runtime.Log("only owner can update contract")
return false
}
management.Update(script, manifest)
runtime.Log("neofs contract updated")
return true
}
// AlphabetList returns array of alphabet node keys.
func AlphabetList() []common.IRNode {
ctx := storage.GetReadOnlyContext()
return getNodes(ctx, alphabetKey)
}
// InnerRingCandidates returns array of inner ring candidate node keys.
func InnerRingCandidates() []common.IRNode {
ctx := storage.GetReadOnlyContext()
return getNodes(ctx, candidatesKey)
}
// InnerRingCandidateRemove removes key from the list of inner ring candidates.
func InnerRingCandidateRemove(key interop.PublicKey) bool {
ctx := storage.GetContext()
if !runtime.CheckWitness(key) {
alphabet := getNodes(ctx, alphabetKey)
threshold := len(alphabet)*2/3 + 1
nodeKey := common.InnerRingInvoker(alphabet)
if len(nodeKey) == 0 {
panic("irCandidateRemove: invoked by non alphabet node")
}
id := append(key, []byte("delete")...)
hashID := crypto.Sha256(id)
n := common.Vote(ctx, hashID, nodeKey)
if n < threshold {
return true
}
}
nodes := []common.IRNode{} // it is explicit declaration of empty slice, not nil
candidates := getNodes(ctx, candidatesKey)
for i := range candidates {
c := candidates[i]
if !common.BytesEqual(c.PublicKey, key) {
nodes = append(nodes, c)
} else {
runtime.Log("irCandidateRemove: candidate has been removed")
}
}
common.SetSerialized(ctx, candidatesKey, nodes)
return true
}
// InnerRingCandidateAdd adds key to the list of inner ring candidates.
func InnerRingCandidateAdd(key interop.PublicKey) bool {
ctx := storage.GetContext()
if !runtime.CheckWitness(key) {
panic("irCandidateAdd: you should be the owner of the public key")
}
c := common.IRNode{PublicKey: key}
candidates := getNodes(ctx, candidatesKey)
list, ok := addNode(candidates, c)
if !ok {
panic("irCandidateAdd: candidate already in the list")
}
from := contract.CreateStandardAccount(key)
to := runtime.GetExecutingScriptHash()
fee := getConfig(ctx, candidateFeeConfigKey).(int)
transferred := gas.Transfer(from, to, fee, []byte(ignoreDepositNotification))
if !transferred {
panic("irCandidateAdd: failed to transfer funds, aborting")
}
runtime.Log("irCandidateAdd: candidate has been added")
common.SetSerialized(ctx, candidatesKey, list)
return true
}
// OnNEP17Payment is a callback for NEP-17 compatible native GAS contract.
func OnNEP17Payment(from interop.Hash160, amount int, data interface{}) {
rcv := data.(interop.Hash160)
if common.BytesEqual(rcv, []byte(ignoreDepositNotification)) {
return
}
caller := runtime.GetCallingScriptHash()
if !common.BytesEqual(caller, interop.Hash160(gas.Hash)) {
panic("onNEP17Payment: only GAS can be accepted for deposit")
}
switch len(rcv) {
case 20:
case 0:
rcv = from
default:
panic("onNEP17Payment: invalid data argument, expected Hash160")
}
runtime.Log("onNEP17Payment: funds have been transferred")
tx := runtime.GetScriptContainer()
runtime.Notify("Deposit", from, amount, rcv, tx.Hash)
}
// Deposit gas assets to this script-hash address in NeoFS balance contract.
func Deposit(from interop.Hash160, amount int, rcv interop.Hash160) bool {
if !runtime.CheckWitness(from) {
panic("deposit: you should be the owner of the wallet")
}
if amount > maxBalanceAmount {
panic("deposit: out of max amount limit")
}
if amount <= 0 {
return false
}
amount = amount * 100000000
to := runtime.GetExecutingScriptHash()
transferred := gas.Transfer(from, to, amount, rcv)
if !transferred {
panic("deposit: failed to transfer funds, aborting")
}
return true
}
// Withdraw initialize gas asset withdraw from NeoFS balance.
func Withdraw(user []byte, amount int) bool {
if !runtime.CheckWitness(user) {
panic("withdraw: you should be the owner of the wallet")
}
if amount < 0 {
panic("withdraw: non positive amount number")
}
if amount > maxBalanceAmount {
panic("withdraw: out of max amount limit")
}
amount = amount * 100000000
tx := runtime.GetScriptContainer()
runtime.Notify("Withdraw", user, amount, tx.Hash)
return true
}
// Cheque sends gas assets back to the user if they were successfully
// locked in NeoFS balance contract.
func Cheque(id []byte, user interop.Hash160, amount int, lockAcc []byte) bool {
ctx := storage.GetContext()
alphabet := getNodes(ctx, alphabetKey)
threshold := len(alphabet)*2/3 + 1
cashedCheques := getCashedCheques(ctx)
hashID := crypto.Sha256(id)
key := common.InnerRingInvoker(alphabet)
if len(key) == 0 {
panic("cheque: invoked by non alphabet node")
}
c := cheque{id: id}
list, ok := addCheque(cashedCheques, c)
if !ok {
panic("cheque: non unique id")
}
n := common.Vote(ctx, hashID, key)
if n >= threshold {
common.RemoveVotes(ctx, hashID)
from := runtime.GetExecutingScriptHash()
transferred := gas.Transfer(from, user, amount, nil)
if !transferred {
panic("cheque: failed to transfer funds, aborting")
}
runtime.Log("cheque: funds have been transferred")
common.SetSerialized(ctx, cashedChequesKey, list)
runtime.Notify("Cheque", id, user, amount, lockAcc)
}
return true
}
// Bind public key with user's account to use it in NeoFS requests.
func Bind(user []byte, keys []interop.PublicKey) bool {
if !runtime.CheckWitness(user) {
panic("binding: you should be the owner of the wallet")
}
for i := 0; i < len(keys); i++ {
pubKey := keys[i]
if len(pubKey) != publicKeySize {
panic("binding: incorrect public key size")
}
}
runtime.Notify("Bind", user, keys)
return true
}
// Unbind public key from user's account
func Unbind(user []byte, keys []interop.PublicKey) bool {
if !runtime.CheckWitness(user) {
panic("unbinding: you should be the owner of the wallet")
}
for i := 0; i < len(keys); i++ {
pubKey := keys[i]
if len(pubKey) != publicKeySize {
panic("unbinding: incorrect public key size")
}
}
runtime.Notify("Unbind", user, keys)
return true
}
// AlphabetUpdate updates list of alphabet nodes with provided list of
// public keys.
func AlphabetUpdate(chequeID []byte, args []interop.PublicKey) bool {
ctx := storage.GetContext()
if len(args) == 0 {
panic("alphabetUpdate: bad arguments")
}
alphabet := getNodes(ctx, alphabetKey)
threshold := len(alphabet)*2/3 + 1
key := common.InnerRingInvoker(alphabet)
if len(key) == 0 {
panic("innerRingUpdate: invoked by non alphabet node")
}
c := cheque{id: chequeID}
cashedCheques := getCashedCheques(ctx)
chequesList, ok := addCheque(cashedCheques, c)
if !ok {
panic("irUpdate: non unique chequeID")
}
newAlphabet := []common.IRNode{}
for i := 0; i < len(args); i++ {
pubKey := args[i]
if len(pubKey) != publicKeySize {
panic("alphabetUpdate: invalid public key in alphabet list")
}
newAlphabet = append(newAlphabet, common.IRNode{
PublicKey: pubKey,
})
}
hashID := crypto.Sha256(chequeID)
n := common.Vote(ctx, hashID, key)
if n >= threshold {
common.RemoveVotes(ctx, hashID)
common.SetSerialized(ctx, alphabetKey, newAlphabet)
common.SetSerialized(ctx, cashedChequesKey, chequesList)
runtime.Notify("AlphabetUpdate", c.id, newAlphabet)
runtime.Log("alphabetUpdate: alphabet list has been updated")
}
return true
}
// Config returns value of NeoFS configuration with provided key.
func Config(key []byte) interface{} {
ctx := storage.GetReadOnlyContext()
return getConfig(ctx, key)
}
// SetConfig key-value pair as a NeoFS runtime configuration value.
func SetConfig(id, key, val []byte) bool {
ctx := storage.GetContext()
// check if it is alphabet invocation
alphabet := getNodes(ctx, alphabetKey)
threshold := len(alphabet)*2/3 + 1
nodeKey := common.InnerRingInvoker(alphabet)
if len(nodeKey) == 0 {
panic("setConfig: invoked by non alphabet node")
}
// check unique id of the operation
c := cheque{id: id}
cashedCheques := getCashedCheques(ctx)
chequesList, ok := addCheque(cashedCheques, c)
if !ok {
panic("setConfig: non unique id")
}
// vote for new configuration value
hashID := crypto.Sha256(id)
n := common.Vote(ctx, hashID, nodeKey)
if n >= threshold {
common.RemoveVotes(ctx, hashID)
setConfig(ctx, key, val)
common.SetSerialized(ctx, cashedChequesKey, chequesList)
runtime.Notify("SetConfig", id, key, val)
runtime.Log("setConfig: configuration has been updated")
}
return true
}
// ListConfig returns array of all key-value pairs of NeoFS configuration.
func ListConfig() []record {
ctx := storage.GetReadOnlyContext()
var config []record
it := storage.Find(ctx, configPrefix, storage.None)
for iterator.Next(it) {
pair := iterator.Value(it).([]interface{})
key := pair[0].([]byte)
val := pair[1].([]byte)
r := record{key: key[len(configPrefix):], val: val}
config = append(config, r)
}
return config
}
// InitConfig set up initial NeoFS key-value configuration.
func InitConfig(args [][]byte) bool {
ctx := storage.GetContext()
if getConfig(ctx, candidateFeeConfigKey) != nil {
panic("neofs: configuration already installed")
}
ln := len(args)
if ln%2 != 0 {
panic("initConfig: bad arguments")
}
setConfig(ctx, candidateFeeConfigKey, defaultCandidateFee)
for i := 0; i < ln/2; i++ {
key := args[i*2]
val := args[i*2+1]
setConfig(ctx, key, val)
}
runtime.Log("neofs: config has been installed")
return true
}
// Version of contract.
func Version() int {
return version
}
// getNodes returns deserialized slice of nodes from storage.
func getNodes(ctx storage.Context, key string) []common.IRNode {
data := storage.Get(ctx, key)
if data != nil {
return std.Deserialize(data.([]byte)).([]common.IRNode)
}
return []common.IRNode{}
}
// getCashedCheques returns deserialized slice of used cheques.
func getCashedCheques(ctx storage.Context) []cheque {
data := storage.Get(ctx, cashedChequesKey)
if data != nil {
return std.Deserialize(data.([]byte)).([]cheque)
}
return []cheque{}
}
// getConfig returns installed neofs configuration value or nil if it is not set.
func getConfig(ctx storage.Context, key interface{}) interface{} {
postfix := key.([]byte)
storageKey := append(configPrefix, postfix...)
return storage.Get(ctx, storageKey)
}
// setConfig sets neofs configuration value in the contract storage.
func setConfig(ctx storage.Context, key, val interface{}) {
postfix := key.([]byte)
storageKey := append(configPrefix, postfix...)
storage.Put(ctx, storageKey, val)
}
// 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 common.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 []common.IRNode, n common.IRNode) ([]common.IRNode, bool) {
for i := 0; i < len(lst); i++ {
if common.BytesEqual(n.PublicKey, lst[i].PublicKey) {
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 []common.IRNode, k []byte) ([]common.IRNode, []common.IRNode, bool) {
var (
flag bool
newLst = []common.IRNode{} // it is explicit declaration of empty slice, not nil
)
for i := 0; i < len(lst); i++ {
if common.BytesEqual(k, lst[i].PublicKey) {
add = append(add, lst[i])
flag = true
} else {
newLst = append(newLst, lst[i])
}
}
return newLst, add, flag
}