[#105] policy: Add ListChainNames method

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

policy/config.yml

@@ -7,5 +7,6 @@ safemethods:
   - "getChain"
   - "listChainsByPrefix"
   - "listTargets"
+  - "listChainNames"
   - "iteratorChainsByPrefix"
   - "version"

policy/policy_contract.go

@@ -256,3 +256,11 @@ func ListTargets(entity Kind) iterator.Iterator {
 	mKey := mapKey(entity, []byte{})
 	return storage.Find(ctx, mKey, storage.KeysOnly|storage.RemovePrefix)
 }
+
+// ListChainNames iterates over chain names for specific target.
+func ListChainNames(entity Kind, entityName string) iterator.Iterator {
+	ctx := storage.GetReadOnlyContext()
+	id, _ := mapToNumeric(ctx, entity, []byte(entityName))
+	keyPrefix := storageKey(entity, id, []byte{})
+	return storage.Find(ctx, keyPrefix, storage.KeysOnly|storage.RemovePrefix)
+}

rpcclient/policy/client.go

@@ -80,6 +80,20 @@ func (c *ContractReader) IteratorChainsByPrefixExpanded(entity *big.Int, entityN
 	return unwrap.Array(c.invoker.CallAndExpandIterator(c.hash, "iteratorChainsByPrefix", _numOfIteratorItems, entity, entityName, prefix))
 }
 
+// ListChainNames invokes `listChainNames` method of contract.
+func (c *ContractReader) ListChainNames(entity *big.Int, entityName string) (uuid.UUID, result.Iterator, error) {
+	return unwrap.SessionIterator(c.invoker.Call(c.hash, "listChainNames", entity, entityName))
+}
+
+// ListChainNamesExpanded is similar to ListChainNames (uses the same contract
+// method), but can be useful if the server used doesn't support sessions and
+// doesn't expand iterators. It creates a script that will get the specified
+// number of result items from the iterator right in the VM and return them to
+// you. It's only limited by VM stack and GAS available for RPC invocations.
+func (c *ContractReader) ListChainNamesExpanded(entity *big.Int, entityName string, _numOfIteratorItems int) ([]stackitem.Item, error) {
+	return unwrap.Array(c.invoker.CallAndExpandIterator(c.hash, "listChainNames", _numOfIteratorItems, entity, entityName))
+}
+
 // ListChains invokes `listChains` method of contract.
 func (c *ContractReader) ListChains(namespace string, container string, name []byte) ([]stackitem.Item, error) {
 	return unwrap.Array(c.invoker.Call(c.hash, "listChains", namespace, container, name))

tests/policy_test.go

@@ -66,6 +66,7 @@ func TestPolicy(t *testing.T) {
 	checkChains(t, e, "mynamespace", "cnr1", "ingress", [][]byte{p1, p2, p33}) // Override chain.
 	checkChainsByPrefix(t, e, policy.Container, "cnr1", "", [][]byte{p2, p33})
 	checkChainsByPrefix(t, e, policy.IAM, "", "", nil)
+	checkChainKeys(t, e, policy.Container, "cnr1", []string{"ingress:myrule2", "ingress:myrule3"})
 
 	checkChainsIteratorByPrefix(t, e, policy.Container, "cnr1", "ingress:myrule3", [][]byte{p33})
 	checkChainsIteratorByPrefix(t, e, policy.Container, "cnr1", "ingress", [][]byte{p2, p33})
@@ -151,6 +152,25 @@ func checkChainsIteratorByPrefix(t *testing.T, e *neotest.ContractInvoker, kind
 	}
 }
 
+func checkChainKeys(t *testing.T, e *neotest.ContractInvoker, kind byte, entityName string, expected []string) {
+	s, err := e.TestInvoke(t, "listChainNames", kind, entityName)
+	require.NoError(t, err)
+
+	if s.Len() == 0 {
+		t.Fatal("Stack is empty")
+	}
+
+	iteratorItem := s.Pop().Value().(*storage.Iterator)
+	policys := iteratorToArray(iteratorItem)
+	require.Equal(t, len(expected), len(policys))
+
+	for i := range expected {
+		bytesPolicy, err := policys[i].TryBytes()
+		require.NoError(t, err)
+		require.Equal(t, expected[i], string(bytesPolicy))
+	}
+}
+
 func checksChainsOnStack(t *testing.T, s *vm.Stack, expected [][]byte) {
 	require.Equal(t, 1, s.Len())