frostfs-contract/netmap/netmap_contract.go

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package netmap
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/ledger"
"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 (
storageNode struct {
info []byte
}
netmapNode struct {
node storageNode
state NodeState
}
// NodeState is an enumeration for node states.
NodeState int
record struct {
key []byte
val []byte
}
)
const (
notaryDisabledKey = "notary"
innerRingKey = "innerring"
// DefaultSnapshotCount contains the number of previous snapshots stored by this contract.
// Must be less than 255.
DefaultSnapshotCount = 10
snapshotCountKey = "snapshotCount"
snapshotKeyPrefix = "snapshot_"
snapshotCurrentIDKey = "snapshotCurrent"
snapshotEpoch = "snapshotEpoch"
snapshotBlockKey = "snapshotBlock"
containerContractKey = "containerScriptHash"
balanceContractKey = "balanceScriptHash"
cleanupEpochMethod = "newEpoch"
)
const (
// V2 format
_ NodeState = iota
OnlineState
OfflineState
)
var (
configPrefix = []byte("config")
candidatePrefix = []byte("candidate")
)
// _deploy function sets up initial list of inner ring public keys.
func _deploy(data interface{}, isUpdate bool) {
ctx := storage.GetContext()
var args = data.(struct {
notaryDisabled bool
addrBalance interop.Hash160
addrContainer interop.Hash160
keys []interop.PublicKey
config [][]byte
version int
})
ln := len(args.config)
if ln%2 != 0 {
panic("bad configuration")
}
for i := 0; i < ln/2; i++ {
key := args.config[i*2]
val := args.config[i*2+1]
setConfig(ctx, key, val)
}
if isUpdate {
common.CheckVersion(args.version)
return
}
if len(args.addrBalance) != interop.Hash160Len || len(args.addrContainer) != interop.Hash160Len {
panic("incorrect length of contract script hash")
}
// epoch number is a little endian int, it doesn't need to be serialized
storage.Put(ctx, snapshotCountKey, DefaultSnapshotCount)
storage.Put(ctx, snapshotEpoch, 0)
storage.Put(ctx, snapshotBlockKey, 0)
prefix := []byte(snapshotKeyPrefix)
for i := 0; i < DefaultSnapshotCount; i++ {
common.SetSerialized(ctx, append(prefix, byte(i)), []storageNode{})
}
storage.Put(ctx, snapshotCurrentIDKey, 0)
storage.Put(ctx, balanceContractKey, args.addrBalance)
storage.Put(ctx, containerContractKey, args.addrContainer)
// initialize the way to collect signatures
storage.Put(ctx, notaryDisabledKey, args.notaryDisabled)
if args.notaryDisabled {
common.SetSerialized(ctx, innerRingKey, args.keys)
common.InitVote(ctx)
runtime.Log("netmap contract notary disabled")
}
runtime.Log("netmap 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")
}
contract.Call(interop.Hash160(management.Hash), "update",
contract.All, script, manifest, common.AppendVersion(data))
runtime.Log("netmap contract updated")
}
// InnerRingList method returns a slice of structures that contains the public key of
// an Inner Ring node. It should be used in notary disabled environment only.
//
// If notary is enabled, look to NeoFSAlphabet role in native RoleManagement
// contract of the sidechain.
func InnerRingList() []common.IRNode {
ctx := storage.GetReadOnlyContext()
pubs := getIRNodes(ctx)
nodes := []common.IRNode{}
for i := range pubs {
nodes = append(nodes, common.IRNode{PublicKey: pubs[i]})
}
return nodes
}
// UpdateInnerRing method updates a list of Inner Ring node keys. It should be used
// only in notary disabled environment. It can be invoked only by Alphabet nodes.
//
// If notary is enabled, update NeoFSAlphabet role in native RoleManagement
// contract of the sidechain. Use notary service to collect multisignature.
func UpdateInnerRing(keys []interop.PublicKey) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
var ( // for invocation collection without notary
alphabet []interop.PublicKey
nodeKey []byte
)
if notaryDisabled {
alphabet = common.AlphabetNodes()
nodeKey = common.InnerRingInvoker(alphabet)
if len(nodeKey) == 0 {
panic("this method must be invoked by alphabet nodes")
}
} else {
multiaddr := common.AlphabetAddress()
common.CheckAlphabetWitness(multiaddr)
}
if notaryDisabled {
threshold := len(alphabet)*2/3 + 1
id := keysID(keys, []byte("updateIR"))
n := common.Vote(ctx, id, nodeKey)
if n < threshold {
return
}
common.RemoveVotes(ctx, id)
}
runtime.Log("inner ring list updated")
common.SetSerialized(ctx, innerRingKey, keys)
}
// AddPeerIR method tries to add a new candidate to the network map.
// It should only be invoked in notary-enabled environment by the alphabet.
func AddPeerIR(nodeInfo []byte) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
if notaryDisabled {
panic("AddPeerIR should only be called in notary-enabled environment")
}
common.CheckAlphabetWitness(common.AlphabetAddress())
addToNetmap(ctx, storageNode{info: nodeInfo})
publicKey := nodeInfo[2:35] // V2 format: offset:2, len:33
runtime.Notify("AddPeerSuccess", interop.PublicKey(publicKey))
}
// AddPeer method adds a new candidate to the next network map if it was invoked
// by Alphabet node. If it was invoked by a node candidate, it produces AddPeer
// notification. Otherwise, the method throws panic.
//
// If the candidate already exists, its info is updated.
// NodeInfo argument contains a stable marshaled version of netmap.NodeInfo
// structure.
func AddPeer(nodeInfo []byte) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
var ( // for invocation collection without notary
alphabet []interop.PublicKey
nodeKey []byte
)
if notaryDisabled {
alphabet = common.AlphabetNodes()
nodeKey = common.InnerRingInvoker(alphabet)
}
// V2 format
publicKey := nodeInfo[2:35] // offset:2, len:33
// If notary is enabled or caller is not an alphabet node,
// just emit the notification for alphabet.
if !notaryDisabled || len(nodeKey) == 0 {
common.CheckWitness(publicKey)
if notaryDisabled {
runtime.Notify("AddPeer", nodeInfo)
}
return
}
candidate := storageNode{
info: nodeInfo,
}
if notaryDisabled {
threshold := len(alphabet)*2/3 + 1
rawCandidate := std.Serialize(candidate)
id := crypto.Sha256(rawCandidate)
n := common.Vote(ctx, id, nodeKey)
if n < threshold {
return
}
common.RemoveVotes(ctx, id)
}
addToNetmap(ctx, candidate)
runtime.Notify("AddPeerSuccess", interop.PublicKey(publicKey))
}
// UpdateState method updates the state of a node from the network map candidate list.
// For notary-ENABLED environment, tx must be signed by both storage node and alphabet.
// To force update without storage node signature, see `UpdateStateIR`.
//
// For notary-DISABLED environment, the behaviour depends on who signed the transaction:
// 1. If it was signed by alphabet, go into voting.
// 2. If it was signed by a storage node, emit `UpdateState` notification.
// 2. Fail in any other case.
//
// The behaviour can be summarized in the following table:
// | notary \ Signer | Storage node | Alphabet | Both |
// | ENABLED | FAIL | FAIL | OK |
// | DISABLED | NOTIFICATION | OK | OK (same as alphabet) |
// State argument defines node state. The only supported state now is (2) --
// offline state. Node is removed from the network map candidate list.
//
// Method panics when invoked with unsupported states.
func UpdateState(state int, publicKey interop.PublicKey) {
if len(publicKey) != interop.PublicKeyCompressedLen {
panic("incorrect public key")
}
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
if notaryDisabled {
alphabet := common.AlphabetNodes()
nodeKey := common.InnerRingInvoker(alphabet)
// If caller is not an alphabet node,
// just emit the notification for alphabet.
if len(nodeKey) == 0 {
common.CheckWitness(publicKey)
runtime.Notify("UpdateState", state, publicKey)
return
}
threshold := len(alphabet)*2/3 + 1
id := common.InvokeID([]interface{}{state, publicKey}, []byte("update"))
n := common.Vote(ctx, id, nodeKey)
if n < threshold {
return
}
common.RemoveVotes(ctx, id)
} else {
common.CheckWitness(publicKey)
common.CheckAlphabetWitness(common.AlphabetAddress())
}
switch NodeState(state) {
case OfflineState:
removeFromNetmap(ctx, publicKey)
runtime.Log("remove storage node from the network map")
default:
panic("unsupported state")
}
runtime.Notify("UpdateStateSuccess", publicKey, state)
}
// UpdateStateIR method tries to change the node state in the network map.
// Should only be invoked in notary-enabled environment by alphabet.
func UpdateStateIR(state NodeState, publicKey interop.PublicKey) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
if notaryDisabled {
panic("UpdateStateIR should only be called in notary-enabled environment")
}
common.CheckAlphabetWitness(common.AlphabetAddress())
switch state {
case OfflineState:
removeFromNetmap(ctx, publicKey)
default:
panic("unsupported state")
}
runtime.Notify("UpdateStateSuccess", publicKey, state)
}
// NewEpoch method changes the epoch number up to the provided epochNum argument. It can
// be invoked only by Alphabet nodes. If provided epoch number is less than the
// current epoch number or equals it, the method throws panic.
//
// When epoch number is updated, the contract sets storage node candidates as the current
// network map. The contract also invokes NewEpoch method on Balance and Container
// contracts.
//
// It produces NewEpoch notification.
func NewEpoch(epochNum int) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
var ( // for invocation collection without notary
alphabet []interop.PublicKey
nodeKey []byte
)
if notaryDisabled {
alphabet = common.AlphabetNodes()
nodeKey = common.InnerRingInvoker(alphabet)
if len(nodeKey) == 0 {
panic("this method must be invoked by inner ring nodes")
}
} else {
multiaddr := common.AlphabetAddress()
common.CheckAlphabetWitness(multiaddr)
}
if notaryDisabled {
threshold := len(alphabet)*2/3 + 1
id := common.InvokeID([]interface{}{epochNum}, []byte("epoch"))
n := common.Vote(ctx, id, nodeKey)
if n < threshold {
return
}
common.RemoveVotes(ctx, id)
}
currentEpoch := storage.Get(ctx, snapshotEpoch).(int)
if epochNum <= currentEpoch {
panic("invalid epoch") // ignore invocations with invalid epoch
}
dataOnlineState := filterNetmap(ctx, OnlineState)
runtime.Log("process new epoch")
// todo: check if provided epoch number is bigger than current
storage.Put(ctx, snapshotEpoch, epochNum)
storage.Put(ctx, snapshotBlockKey, ledger.CurrentIndex())
id := storage.Get(ctx, snapshotCurrentIDKey).(int)
id = (id + 1) % getSnapshotCount(ctx)
storage.Put(ctx, snapshotCurrentIDKey, id)
// put netmap into actual snapshot
common.SetSerialized(ctx, snapshotKeyPrefix+string([]byte{byte(id)}), dataOnlineState)
// make clean up routines in other contracts
cleanup(ctx, epochNum)
runtime.Notify("NewEpoch", epochNum)
}
// Epoch method returns the current epoch number.
func Epoch() int {
ctx := storage.GetReadOnlyContext()
return storage.Get(ctx, snapshotEpoch).(int)
}
// LastEpochBlock method returns the block number when the current epoch was applied.
func LastEpochBlock() int {
ctx := storage.GetReadOnlyContext()
return storage.Get(ctx, snapshotBlockKey).(int)
}
// Netmap method returns a list of structures that contain a byte array of a stable
// marshalled netmap.NodeInfo structure. These structures contain Storage nodes
// of the current epoch.
func Netmap() []storageNode {
ctx := storage.GetReadOnlyContext()
id := storage.Get(ctx, snapshotCurrentIDKey).(int)
return getSnapshot(ctx, snapshotKeyPrefix+string([]byte{byte(id)}))
}
// NetmapCandidates method returns a list of structures that contain the node state
// and a byte array of a stable marshalled netmap.NodeInfo structure.
// These structures contain Storage node candidates for the next epoch.
func NetmapCandidates() []netmapNode {
ctx := storage.GetReadOnlyContext()
return getNetmapNodes(ctx)
}
// Snapshot method returns a list of structures that contain the node state
// (online: 1) and a byte array of a stable marshalled netmap.NodeInfo structure.
// These structures contain Storage nodes of the specified epoch.
//
// Netmap contract contains only two recent network map snapshots: current and
// previous epoch. For diff bigger than 1 or less than 0, the method throws panic.
func Snapshot(diff int) []storageNode {
ctx := storage.GetReadOnlyContext()
count := getSnapshotCount(ctx)
if diff < 0 || count <= diff {
panic("incorrect diff")
}
id := storage.Get(ctx, snapshotCurrentIDKey).(int)
needID := (id - diff + count) % count
key := snapshotKeyPrefix + string([]byte{byte(needID)})
return getSnapshot(ctx, key)
}
func getSnapshotCount(ctx storage.Context) int {
return storage.Get(ctx, snapshotCountKey).(int)
}
// UpdateSnapshotCount updates the number of the stored snapshots.
// If a new number is less than the old one, old snapshots are removed.
// Otherwise, history is extended with empty snapshots, so
// `Snapshot` method can return invalid results for `diff = new-old` epochs
// until `diff` epochs have passed.
func UpdateSnapshotCount(count int) {
common.CheckAlphabetWitness(common.AlphabetAddress())
if count < 0 {
panic("count must be positive")
}
ctx := storage.GetContext()
curr := getSnapshotCount(ctx)
if curr == count {
panic("count has not changed")
}
storage.Put(ctx, snapshotCountKey, count)
id := storage.Get(ctx, snapshotCurrentIDKey).(int)
var delStart, delFinish int
if curr < count {
// Increase history size.
//
// Old state (N = count, K = curr, E = current index, C = current epoch)
// KEY INDEX: 0 | 1 | ... | E | E+1 | ... | K-1 | ... | N-1
// EPOCH : C-E | C-E+1 | ... | C | C-K+1 | ... | C-E-1 |
//
// New state:
// KEY INDEX: 0 | 1 | ... | E | E+1 | ... | K-1 | ... | N-1
// EPOCH : C-E | C-E+1 | ... | C | nil | ... | . | ... | C-E-1
//
// So we need to move tail snapshots N-K keys forward,
// i.e. from E+1 .. K to N-K+E+1 .. N
diff := count - curr
lower := diff + id + 1
for k := count - 1; k >= lower; k-- {
moveSnapshot(ctx, k-diff, k)
}
delStart, delFinish = id+1, id+1+diff
if curr < delFinish {
delFinish = curr
}
} else {
// Decrease history size.
//
// Old state (N = curr, K = count)
// KEY INDEX: 0 | 1 | ... K1 ... | E | E+1 | ... K2-1 ... | N-1
// EPOCH : C-E | C-E+1 | ... .. ... | C | C-N+1 | ... ... ... | C-E-1
var step, start int
if id < count {
// K2 case, move snapshots from E+1+N-K .. N-1 range to E+1 .. K-1
// New state:
// KEY INDEX: 0 | 1 | ... | E | E+1 | ... | K-1
// EPOCH : C-E | C-E+1 | ... | C | C-K+1 | ... | C-E-1
step = curr - count
start = id + 1
} else {
// New state:
// KEY INDEX: 0 | 1 | ... | K-1
// EPOCH : C-K+1 | C-K+2 | ... | C
// K1 case, move snapshots from E-K+1 .. E range to 0 .. K-1
// AND replace current id with K-1
step = id - count + 1
storage.Put(ctx, snapshotCurrentIDKey, count-1)
}
for k := start; k < count; k++ {
moveSnapshot(ctx, k+step, k)
}
delStart, delFinish = count, curr
}
for k := delStart; k < delFinish; k++ {
key := snapshotKeyPrefix + string([]byte{byte(k)})
storage.Delete(ctx, key)
}
}
func moveSnapshot(ctx storage.Context, from, to int) {
keyFrom := snapshotKeyPrefix + string([]byte{byte(from)})
keyTo := snapshotKeyPrefix + string([]byte{byte(to)})
data := storage.Get(ctx, keyFrom)
storage.Put(ctx, keyTo, data)
}
// SnapshotByEpoch method returns a list of structures that contain the node state
// (online: 1) and a byte array of a stable marshalled netmap.NodeInfo structure.
// These structures contain Storage nodes of the specified epoch.
//
// Netmap contract contains only two recent network map snapshot: current and
// previous epoch. For all others epoch method throws panic.
func SnapshotByEpoch(epoch int) []storageNode {
ctx := storage.GetReadOnlyContext()
currentEpoch := storage.Get(ctx, snapshotEpoch).(int)
return Snapshot(currentEpoch - epoch)
}
// Config returns configuration value of NeoFS configuration. If key does
// not exists, returns nil.
func Config(key []byte) interface{} {
ctx := storage.GetReadOnlyContext()
return getConfig(ctx, key)
}
// SetConfig key-value pair as a NeoFS runtime configuration value. It can be invoked
// only by Alphabet nodes.
func SetConfig(id, key, val []byte) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
var ( // for invocation collection without notary
alphabet []interop.PublicKey
nodeKey []byte
)
if notaryDisabled {
alphabet = common.AlphabetNodes()
nodeKey = common.InnerRingInvoker(alphabet)
if len(nodeKey) == 0 {
panic("invoked by non inner ring node")
}
} else {
multiaddr := common.AlphabetAddress()
common.CheckAlphabetWitness(multiaddr)
}
if notaryDisabled {
threshold := len(alphabet)*2/3 + 1
n := common.Vote(ctx, id, nodeKey)
if n < threshold {
return
}
common.RemoveVotes(ctx, id)
}
setConfig(ctx, key, val)
runtime.Log("configuration has been updated")
}
// ListConfig returns an array of structures that contain key and value of all
// NeoFS configuration records. Key and value are both byte arrays.
func ListConfig() []record {
ctx := storage.GetReadOnlyContext()
var config []record
it := storage.Find(ctx, configPrefix, storage.None)
for iterator.Next(it) {
pair := iterator.Value(it).(struct {
key []byte
val []byte
})
r := record{key: pair.key[len(configPrefix):], val: pair.val}
config = append(config, r)
}
return config
}
// Version returns the version of the contract.
func Version() int {
return common.Version
}
func addToNetmap(ctx storage.Context, n storageNode) {
var (
newNode = n.info
newNodeKey = newNode[2:35]
storageKey = append(candidatePrefix, newNodeKey...)
node = netmapNode{
node: n,
state: OnlineState,
}
)
storage.Put(ctx, storageKey, std.Serialize(node))
}
func removeFromNetmap(ctx storage.Context, key interop.PublicKey) {
storageKey := append(candidatePrefix, key...)
storage.Delete(ctx, storageKey)
}
func filterNetmap(ctx storage.Context, st NodeState) []storageNode {
var (
netmap = getNetmapNodes(ctx)
result = []storageNode{}
)
for i := 0; i < len(netmap); i++ {
item := netmap[i]
if item.state == st {
result = append(result, item.node)
}
}
return result
}
func getNetmapNodes(ctx storage.Context) []netmapNode {
result := []netmapNode{}
it := storage.Find(ctx, candidatePrefix, storage.ValuesOnly|storage.DeserializeValues)
for iterator.Next(it) {
node := iterator.Value(it).(netmapNode)
result = append(result, node)
}
return result
}
func getSnapshot(ctx storage.Context, key string) []storageNode {
data := storage.Get(ctx, key)
if data != nil {
return std.Deserialize(data.([]byte)).([]storageNode)
}
return []storageNode{}
}
func getConfig(ctx storage.Context, key interface{}) interface{} {
postfix := key.([]byte)
storageKey := append(configPrefix, postfix...)
return storage.Get(ctx, storageKey)
}
func setConfig(ctx storage.Context, key, val interface{}) {
postfix := key.([]byte)
storageKey := append(configPrefix, postfix...)
storage.Put(ctx, storageKey, val)
}
func cleanup(ctx storage.Context, epoch int) {
balanceContractAddr := storage.Get(ctx, balanceContractKey).(interop.Hash160)
contract.Call(balanceContractAddr, cleanupEpochMethod, contract.All, epoch)
containerContractAddr := storage.Get(ctx, containerContractKey).(interop.Hash160)
contract.Call(containerContractAddr, cleanupEpochMethod, contract.All, epoch)
}
func getIRNodes(ctx storage.Context) []interop.PublicKey {
data := storage.Get(ctx, innerRingKey)
if data != nil {
return std.Deserialize(data.([]byte)).([]interop.PublicKey)
}
return []interop.PublicKey{}
}
func keysID(args []interop.PublicKey, prefix []byte) []byte {
var (
result []byte
)
result = append(result, prefix...)
for i := range args {
result = append(result, args[i]...)
}
return crypto.Sha256(result)
}