[#122] subnet: implement delete method

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

subnet/subnet_contract.go

@@ -100,6 +100,26 @@ func Get(id []byte) []byte {
 	return raw.([]byte)
 }
 
+// Delete deletes subnet with the specified id.
+func Delete(id []byte) {
+	ctx := storage.GetContext()
+	key := append([]byte{ownerPrefix}, id...)
+	raw := storage.Get(ctx, key)
+	if raw == nil {
+		panic("delete:" + ErrNotExist)
+	}
+
+	owner := raw.([]byte)
+	if !runtime.CheckWitness(owner) {
+		panic("delete: owner witness check failed")
+	}
+
+	storage.Delete(ctx, key)
+
+	key[0] = infoPrefix
+	storage.Delete(ctx, key)
+}
+
 // Update method updates contract source code and manifest. Can be invoked
 // only by committee.
 func Update(script []byte, manifest []byte, data interface{}) {

tests/subnet_test.go

@@ -57,3 +57,26 @@ func TestSubnet_Put(t *testing.T) {
 	cAcc.Invoke(t, stackitem.NewBuffer(info), "get", id)
 	cBoth.InvokeFail(t, subnet.ErrAlreadyExists, "put", id, pub, info)
 }
+
+func TestSubnet_Delete(t *testing.T) {
+	e := newSubnetInvoker(t)
+
+	acc := e.NewAccount(t)
+	pub, ok := vm.ParseSignatureContract(acc.Script())
+	require.True(t, ok)
+
+	id := make([]byte, 4)
+	binary.LittleEndian.PutUint32(id, 123)
+	info := randomBytes(10)
+
+	cBoth := e.WithSigners(e.Committee, acc)
+	cBoth.Invoke(t, stackitem.Null{}, "put", id, pub, info)
+
+	e.InvokeFail(t, "witness check failed", "delete", id)
+
+	cAcc := e.WithSigners(acc)
+	cAcc.InvokeFail(t, subnet.ErrNotExist, "delete", []byte{1, 1, 1, 1})
+	cAcc.Invoke(t, stackitem.Null{}, "delete", id)
+	cAcc.InvokeFail(t, subnet.ErrNotExist, "get", id)
+	cAcc.InvokeFail(t, subnet.ErrNotExist, "delete", id)
+}