9 "github.com/golang/groupcache/lru"
10 dbm "github.com/tendermint/tmlibs/db"
11 "golang.org/x/crypto/sha3"
13 "github.com/bytom/blockchain/signers"
14 "github.com/bytom/common"
15 "github.com/bytom/consensus"
16 "github.com/bytom/crypto/ed25519"
17 "github.com/bytom/crypto/ed25519/chainkd"
18 chainjson "github.com/bytom/encoding/json"
19 "github.com/bytom/errors"
20 "github.com/bytom/protocol"
21 "github.com/bytom/protocol/bc"
22 "github.com/bytom/protocol/vm/vmutil"
25 // DefaultNativeAsset native BTM asset
26 var DefaultNativeAsset *Asset
33 assetIndexKey = []byte("AssetIndex")
34 assetPrefix = []byte("Asset:")
35 aliasPrefix = []byte("AssetAlias:")
36 extAssetPrefix = []byte("EXA:")
39 func initNativeAsset() {
40 signer := &signers.Signer{Type: "internal"}
41 alias := consensus.BTMAlias
43 definitionBytes, _ := serializeAssetDef(consensus.BTMDefinitionMap)
44 DefaultNativeAsset = &Asset{
46 AssetID: *consensus.BTMAssetID,
49 DefinitionMap: consensus.BTMDefinitionMap,
50 RawDefinitionByte: definitionBytes,
54 // AliasKey store asset alias prefix
55 func AliasKey(name string) []byte {
56 return append(aliasPrefix, []byte(name)...)
59 // AssetKey asset store prefix
60 func Key(id *bc.AssetID) []byte {
61 return append(assetPrefix, id.Bytes()...)
64 // ExtAssetKey return store external assets key
65 func ExtAssetKey(id *bc.AssetID) []byte {
66 return append(extAssetPrefix, id.Bytes()...)
69 // pre-define errors for supporting bytom errorFormatter
71 ErrDuplicateAlias = errors.New("duplicate asset alias")
72 ErrDuplicateAsset = errors.New("duplicate asset id")
73 ErrSerializing = errors.New("serializing asset definition")
74 ErrMarshalAsset = errors.New("failed marshal asset")
75 ErrFindAsset = errors.New("fail to find asset")
76 ErrInternalAsset = errors.New("btm has been defined as the internal asset")
77 ErrNullAlias = errors.New("null asset alias")
80 //NewRegistry create new registry
81 func NewRegistry(db dbm.DB, chain *protocol.Chain) *Registry {
86 cache: lru.New(maxAssetCache),
87 aliasCache: lru.New(maxAssetCache),
91 // Registry tracks and stores all known assets on a blockchain.
92 type Registry struct {
100 assetIndexMu sync.Mutex
104 //Asset describe asset on bytom chain
107 AssetID bc.AssetID `json:"id"`
108 Alias *string `json:"alias"`
109 VMVersion uint64 `json:"vm_version"`
110 IssuanceProgram chainjson.HexBytes `json:"issue_program"`
111 RawDefinitionByte chainjson.HexBytes `json:"raw_definition_byte"`
112 DefinitionMap map[string]interface{} `json:"definition"`
115 func (reg *Registry) getNextAssetIndex() uint64 {
116 reg.assetIndexMu.Lock()
117 defer reg.assetIndexMu.Unlock()
119 nextIndex := uint64(1)
120 if rawIndex := reg.db.Get(assetIndexKey); rawIndex != nil {
121 nextIndex = common.BytesToUnit64(rawIndex) + 1
124 reg.db.Set(assetIndexKey, common.Unit64ToBytes(nextIndex))
128 // Define defines a new Asset.
129 func (reg *Registry) Define(xpubs []chainkd.XPub, quorum int, definition map[string]interface{}, alias string) (*Asset, error) {
131 return nil, errors.Wrap(signers.ErrNoXPubs)
134 normalizedAlias := strings.ToUpper(strings.TrimSpace(alias))
135 if normalizedAlias == "" {
136 return nil, errors.Wrap(ErrNullAlias)
139 if normalizedAlias == consensus.BTMAlias {
140 return nil, ErrInternalAsset
144 defer reg.assetMu.Unlock()
146 if existed := reg.db.Get(AliasKey(normalizedAlias)); existed != nil {
147 return nil, ErrDuplicateAlias
150 nextAssetIndex := reg.getNextAssetIndex()
151 assetSigner, err := signers.Create("asset", xpubs, quorum, nextAssetIndex)
156 rawDefinition, err := serializeAssetDef(definition)
158 return nil, ErrSerializing
161 path := signers.Path(assetSigner, signers.AssetKeySpace)
162 derivedXPubs := chainkd.DeriveXPubs(assetSigner.XPubs, path)
163 derivedPKs := chainkd.XPubKeys(derivedXPubs)
164 issuanceProgram, vmver, err := multisigIssuanceProgram(derivedPKs, assetSigner.Quorum)
169 defHash := bc.NewHash(sha3.Sum256(rawDefinition))
171 DefinitionMap: definition,
172 RawDefinitionByte: rawDefinition,
174 IssuanceProgram: issuanceProgram,
175 AssetID: bc.ComputeAssetID(issuanceProgram, vmver, &defHash),
177 Alias: &normalizedAlias,
180 if existAsset := reg.db.Get(Key(&asset.AssetID)); existAsset != nil {
181 return nil, ErrDuplicateAsset
184 ass, err := json.Marshal(asset)
186 return nil, ErrMarshalAsset
189 storeBatch := reg.db.NewBatch()
190 storeBatch.Set(AliasKey(normalizedAlias), []byte(asset.AssetID.String()))
191 storeBatch.Set(Key(&asset.AssetID), ass)
197 // FindByID retrieves an Asset record along with its signer, given an assetID.
198 func (reg *Registry) FindByID(ctx context.Context, id *bc.AssetID) (*Asset, error) {
200 cached, ok := reg.cache.Get(id.String())
203 return cached.(*Asset), nil
206 bytes := reg.db.Get(Key(id))
208 return nil, ErrFindAsset
212 if err := json.Unmarshal(bytes, asset); err != nil {
217 reg.cache.Add(id.String(), asset)
222 //GetIDByAlias return AssetID string and nil by asset alias,if err ,return "" and err
223 func (reg *Registry) GetIDByAlias(alias string) (string, error) {
224 rawID := reg.db.Get(AliasKey(alias))
226 return "", ErrFindAsset
228 return string(rawID), nil
231 // FindByAlias retrieves an Asset record along with its signer,
232 // given an asset alias.
233 func (reg *Registry) FindByAlias(ctx context.Context, alias string) (*Asset, error) {
235 cachedID, ok := reg.aliasCache.Get(alias)
238 return reg.FindByID(ctx, cachedID.(*bc.AssetID))
241 rawID := reg.db.Get(AliasKey(alias))
243 return nil, errors.Wrapf(ErrFindAsset, "no such asset, alias: %s", alias)
246 assetID := &bc.AssetID{}
247 if err := assetID.UnmarshalText(rawID); err != nil {
252 reg.aliasCache.Add(alias, assetID)
254 return reg.FindByID(ctx, assetID)
257 //GetAliasByID return asset alias string by AssetID string
258 func (reg *Registry) GetAliasByID(id string) string {
260 if id == consensus.BTMAssetID.String() {
261 return consensus.BTMAlias
264 assetID := &bc.AssetID{}
265 if err := assetID.UnmarshalText([]byte(id)); err != nil {
269 asset, err := reg.FindByID(nil, assetID)
277 // GetAsset get asset by assetID
278 func (reg *Registry) GetAsset(id *bc.AssetID) (*Asset, error) {
281 if id.String() == DefaultNativeAsset.AssetID.String() {
282 return DefaultNativeAsset, nil
285 if interAsset := reg.db.Get(Key(id)); interAsset != nil {
286 if err := json.Unmarshal(interAsset, asset); err != nil {
292 if extAsset := reg.db.Get(ExtAssetKey(id)); extAsset != nil {
293 if err := json.Unmarshal(extAsset, asset); err != nil {
299 return nil, errors.WithDetailf(ErrFindAsset, "no such asset, assetID: %s", id)
302 // ListAssets returns the accounts in the db
303 func (reg *Registry) ListAssets() ([]*Asset, error) {
304 assets := []*Asset{DefaultNativeAsset}
305 assetIter := reg.db.IteratorPrefix(assetPrefix)
306 defer assetIter.Release()
308 for assetIter.Next() {
310 if err := json.Unmarshal(assetIter.Value(), asset); err != nil {
313 assets = append(assets, asset)
319 // serializeAssetDef produces a canonical byte representation of an asset
320 // definition. Currently, this is implemented using pretty-printed JSON.
321 // As is the standard for Go's map[string] serialization, object keys will
322 // appear in lexicographic order. Although this is mostly meant for machine
323 // consumption, the JSON is pretty-printed for easy reading.
324 func serializeAssetDef(def map[string]interface{}) ([]byte, error) {
326 def = make(map[string]interface{}, 0)
328 return json.MarshalIndent(def, "", " ")
331 func multisigIssuanceProgram(pubkeys []ed25519.PublicKey, nrequired int) (program []byte, vmversion uint64, err error) {
332 issuanceProg, err := vmutil.P2SPMultiSigProgram(pubkeys, nrequired)
336 builder := vmutil.NewBuilder()
337 builder.AddRawBytes(issuanceProg)
338 prog, err := builder.Build()
342 //UpdateAssetAlias updates asset alias
343 func (reg *Registry) UpdateAssetAlias(id, newAlias string) error {
344 oldAlias := reg.GetAliasByID(id)
345 normalizedAlias := strings.ToUpper(strings.TrimSpace(newAlias))
347 if oldAlias == consensus.BTMAlias || newAlias == consensus.BTMAlias {
348 return ErrInternalAsset
351 if oldAlias == "" || normalizedAlias == "" {
355 if _, err := reg.GetIDByAlias(normalizedAlias); err == nil {
356 return ErrDuplicateAlias
359 findAsset, err := reg.FindByAlias(nil, oldAlias)
364 storeBatch := reg.db.NewBatch()
365 findAsset.Alias = &normalizedAlias
366 assetID := &findAsset.AssetID
367 rawAsset, err := json.Marshal(findAsset)
372 storeBatch.Set(Key(assetID), rawAsset)
373 storeBatch.Set(AliasKey(newAlias), []byte(assetID.String()))
374 storeBatch.Delete(AliasKey(oldAlias))
378 reg.aliasCache.Add(newAlias, assetID)
379 reg.aliasCache.Remove(oldAlias)