frostfs-contract/audit/audit_contract.go

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package audit
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/management"
"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 (
auditHeader struct {
epoch int
cid []byte
from interop.PublicKey
}
)
// Audit key is a combination of epoch, container ID and public key of node that
// executed audit. Together it should be no more than 64 bytes. We can't shrink
// epoch and container ID since we iterate over these values. But we can shrink
// public key by using first bytes of the hashed value.
// V2 format
const maxKeySize = 24 // 24 + 32 (container ID length) + 8 (epoch length) = 64
func (a auditHeader) ID() []byte {
var buf interface{} = a.epoch
hashedKey := crypto.Sha256(a.from)
shortedKey := hashedKey[:maxKeySize]
return append(buf.([]byte), append(a.cid, shortedKey...)...)
}
const (
netmapContractKey = "netmapScriptHash"
notaryDisabledKey = "notary"
)
func _deploy(data interface{}, isUpdate bool) {
if isUpdate {
return
}
args := data.([]interface{})
notaryDisabled := args[0].(bool)
addrNetmap := args[1].(interop.Hash160)
ctx := storage.GetContext()
if len(addrNetmap) != 20 {
panic("init: incorrect length of contract script hash")
}
storage.Put(ctx, netmapContractKey, addrNetmap)
// initialize the way to collect signatures
storage.Put(ctx, notaryDisabledKey, notaryDisabled)
if notaryDisabled {
runtime.Log("audit contract notary disabled")
}
runtime.Log("audit contract initialized")
}
// Update method updates contract source code and manifest. 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("audit contract updated")
}
// Put method stores stable marshalled `DataAuditResult` structure. Can be
// invoked only by Inner Ring nodes.
//
// Inner Ring nodes perform audit of the containers and produce `DataAuditResult`
// structures. They are being stored in audit contract and used for settlements
// in later epochs.
func Put(rawAuditResult []byte) {
ctx := storage.GetContext()
notaryDisabled := storage.Get(ctx, notaryDisabledKey).(bool)
var innerRing []common.IRNode
if notaryDisabled {
netmapContract := storage.Get(ctx, netmapContractKey).(interop.Hash160)
innerRing = common.InnerRingNodesFromNetmap(netmapContract)
} else {
innerRing = common.InnerRingNodes()
}
hdr := newAuditHeader(rawAuditResult)
presented := false
for i := range innerRing {
ir := innerRing[i]
if common.BytesEqual(ir.PublicKey, hdr.from) {
presented = true
break
}
}
if !runtime.CheckWitness(hdr.from) || !presented {
panic("audit: put access denied")
}
storage.Put(ctx, hdr.ID(), rawAuditResult)
runtime.Log("audit: result has been saved")
}
// Get method returns stable marshaled DataAuditResult structure.
//
// ID of the DataAuditResult can be obtained from listing methods.
func Get(id []byte) []byte {
ctx := storage.GetReadOnlyContext()
return storage.Get(ctx, id).([]byte)
}
// List method returns list of all available DataAuditResult IDs from
// contract storage.
func List() [][]byte {
ctx := storage.GetReadOnlyContext()
it := storage.Find(ctx, []byte{}, storage.KeysOnly)
return list(it)
}
// ListByEpoch method returns list of DataAuditResult IDs generated in
// specified epoch.
func ListByEpoch(epoch int) [][]byte {
ctx := storage.GetReadOnlyContext()
var buf interface{} = epoch
it := storage.Find(ctx, buf.([]byte), storage.KeysOnly)
return list(it)
}
// ListByCID method returns list of DataAuditResult IDs generated in
// specified epoch for specified container.
func ListByCID(epoch int, cid []byte) [][]byte {
ctx := storage.GetReadOnlyContext()
var buf interface{} = epoch
prefix := append(buf.([]byte), cid...)
it := storage.Find(ctx, prefix, storage.KeysOnly)
return list(it)
}
// ListByNode method returns list of DataAuditResult IDs generated in
// specified epoch for specified container by specified Inner Ring node.
func ListByNode(epoch int, cid []byte, key interop.PublicKey) [][]byte {
ctx := storage.GetReadOnlyContext()
hdr := auditHeader{
epoch: epoch,
cid: cid,
from: key,
}
it := storage.Find(ctx, hdr.ID(), storage.KeysOnly)
return list(it)
}
func list(it iterator.Iterator) [][]byte {
var result [][]byte
ignore := [][]byte{
[]byte(netmapContractKey),
[]byte(notaryDisabledKey),
}
loop:
for iterator.Next(it) {
key := iterator.Value(it).([]byte) // iterator MUST BE `storage.KeysOnly`
for _, ignoreKey := range ignore {
if common.BytesEqual(key, ignoreKey) {
continue loop
}
}
result = append(result, key)
}
return result
}
// Version returns version of the contract.
func Version() int {
return common.Version
}
// readNext reads length from first byte and then reads data (max 127 bytes).
func readNext(input []byte) ([]byte, int) {
var buf interface{} = input[0]
ln := buf.(int)
return input[1 : 1+ln], 1 + ln
}
func newAuditHeader(input []byte) auditHeader {
// V2 format
offset := int(input[1])
offset = 2 + offset + 1 // version prefix + version len + epoch prefix
var buf interface{} = input[offset : offset+8] // [ 8 integer bytes ]
epoch := buf.(int)
offset = offset + 8
// cid is a nested structure with raw bytes
// [ cid struct prefix (wireType + len = 2 bytes), cid value wireType (1 byte), ... ]
cid, cidOffset := readNext(input[offset+2+1:])
// key is a raw byte
// [ public key wireType (1 byte), ... ]
key, _ := readNext(input[offset+2+1+cidOffset+1:])
return auditHeader{
epoch,
cid,
key,
}
}