[#102] nns: Add DeleteDomain

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

nns/nns.yml

@@ -15,6 +15,7 @@ safemethods:
   - "tokens"
   - "resolve"
   - "roots"
+  - "deleteDomain"
 events:
   - name: Transfer
     parameters:

nns/nns_contract.go

@@ -366,6 +366,25 @@ func SetAdmin(name string, admin interop.Hash160) {
 	putNameState(ctx, ns)
 }
 
+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(name, TXT)
+	DeleteRecords(name, A)
+	DeleteRecords(name, AAAA)
+	DeleteRecords(name, CNAME)
+	storage.Delete(ctx, nameKey)
+}
+
 // SetRecord adds a new record of the specified type to the provided domain.
 func SetRecord(name string, typ RecordType, id byte, data string) {
 	tokenID := []byte(tokenIDFromName(name))

rpcclient/nns/client.go

@@ -121,6 +121,28 @@ func (c *Contract) AddRecordUnsigned(name string, typ *big.Int, data string) (*t
 	return c.actor.MakeUnsignedCall(c.hash, "addRecord", nil, name, typ, data)
 }
 
+// DeleteDomain creates a transaction invoking `deleteDomain` method of the contract.
+// This transaction is signed and immediately sent to the network.
+// The values returned are its hash, ValidUntilBlock value and error if any.
+func (c *Contract) DeleteDomain(name string) (util.Uint256, uint32, error) {
+	return c.actor.SendCall(c.hash, "deleteDomain", name)
+}
+
+// DeleteDomainTransaction creates a transaction invoking `deleteDomain` method of the contract.
+// This transaction is signed, but not sent to the network, instead it's
+// returned to the caller.
+func (c *Contract) DeleteDomainTransaction(name string) (*transaction.Transaction, error) {
+	return c.actor.MakeCall(c.hash, "deleteDomain", name)
+}
+
+// DeleteDomainUnsigned creates a transaction invoking `deleteDomain` method of the contract.
+// This transaction is not signed, it's simply returned to the caller.
+// Any fields of it that do not affect fees can be changed (ValidUntilBlock,
+// Nonce), fee values (NetworkFee, SystemFee) can be increased as well.
+func (c *Contract) DeleteDomainUnsigned(name string) (*transaction.Transaction, error) {
+	return c.actor.MakeUnsignedCall(c.hash, "deleteDomain", nil, name)
+}
+
 // DeleteRecords creates a transaction invoking `deleteRecords` method of the contract.
 // This transaction is signed and immediately sent to the network.
 // The values returned are its hash, ValidUntilBlock value and error if any.