[#102] nns: Add DeleteDomain

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

nns/config.yml

@@ -2,7 +2,7 @@ name: "NameService"
 supportedstandards: ["NEP-11"]
 safemethods: ["balanceOf", "decimals", "symbol", "totalSupply", "tokensOf", "ownerOf",
               "tokens", "properties", "roots", "getPrice", "isAvailable", "getRecords",
-              "resolve", "version"]
+              "resolve", "version","deleteDomain"]
 events:
   - name: Transfer
     parameters:

nns/nns_contract.go

@@ -418,11 +418,15 @@ func GetRecords(name string, typ RecordType) []string {
 
 // DeleteRecords removes domain records with the specified type.
 func DeleteRecords(name string, typ RecordType) {
+	ctx := storage.GetContext()
+	deleteRecords(ctx, name, typ)
+}
+
+func deleteRecords(ctx storage.Context, name string, typ RecordType) {
 	if typ == SOA {
 		panic("you cannot delete soa record")
 	}
 	tokenID := []byte(tokenIDFromName(name))
-	ctx := storage.GetContext()
 	ns := getNameState(ctx, tokenID)
 	ns.checkAdmin()
 	recordsKey := getRecordsKeyByType(tokenID, name, typ)
@@ -434,6 +438,25 @@ func DeleteRecords(name string, typ RecordType) {
 	updateSoaSerial(ctx, tokenID)
 }
 
+func DeleteDomain(name string) {
+	ctx := storage.GetContext()
+	deleteDomain(ctx, name)
+}
+
+func deleteDomain(ctx storage.Context, name string) {
+	nameKey := append([]byte{prefixName}, getTokenKey([]byte(name))...)
+	tldBytes := storage.Get(ctx, nameKey)
+	if tldBytes == nil {
+		return
+	}
+
+	deleteRecords(ctx, name, CNAME)
+	deleteRecords(ctx, name, TXT)
+	deleteRecords(ctx, name, A)
+	deleteRecords(ctx, name, AAAA)
+	storage.Delete(ctx, nameKey)
+}
+
 // Resolve resolves given name (not more then three redirects are allowed).
 func Resolve(name string, typ RecordType) []string {
 	ctx := storage.GetReadOnlyContext()

rpcclient/nns/client.go

@@ -60,6 +60,11 @@ func New(actor Actor, hash util.Uint160) *Contract {
 	return &Contract{ContractReader{nep11ndt.NonDivisibleReader, actor, hash}, nep11ndt.BaseWriter, actor, hash}
 }
 
+// DeleteDomain invokes `deleteDomain` method of contract.
+func (c *ContractReader) DeleteDomain(name string) (*result.Invoke, error) {
+	c.invoker.Call(c.hash, "deleteDomain", name)
+}
+
 // GetPrice invokes `getPrice` method of contract.
 func (c *ContractReader) GetPrice() (*big.Int, error) {
 	return unwrap.BigInt(c.invoker.Call(c.hash, "getPrice"))