forked from TrueCloudLab/policy-engine
146 lines
4 KiB
Go
146 lines
4 KiB
Go
package policy
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import (
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"errors"
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"fmt"
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"math/big"
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"strings"
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"git.frostfs.info/TrueCloudLab/frostfs-contract/policy"
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client "git.frostfs.info/TrueCloudLab/frostfs-contract/rpcclient/policy"
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"git.frostfs.info/TrueCloudLab/policy-engine/pkg/chain"
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"git.frostfs.info/TrueCloudLab/policy-engine/pkg/engine"
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"github.com/mr-tron/base58"
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"github.com/nspcc-dev/neo-go/pkg/rpcclient/actor"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
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)
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var (
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ErrEmptyChainID = errors.New("chain id is not set")
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ErrEngineTargetTypeUnsupported = errors.New("this target type is not supported yet")
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)
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// ContractStorage is the interface to manage chain rules within the policy contract.
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type ContractStorage struct {
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contractInterface *client.Contract
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}
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var _ engine.MorphRuleChainStorage = (*ContractStorage)(nil)
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func NewContractStorage(actor client.Actor, contract util.Uint160) *ContractStorage {
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return &ContractStorage{
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contractInterface: client.New(actor, contract),
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}
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}
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func NewContractStorageWithSimpleActor(rpcActor actor.RPCActor, acc *wallet.Account, contract util.Uint160) (*ContractStorage, error) {
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act, err := actor.NewSimple(rpcActor, acc)
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if err != nil {
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return nil, fmt.Errorf("failed to create simple actor: %w", err)
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}
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return NewContractStorage(act, contract), nil
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}
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func transformNameIfContainer(target engine.Target) (name string) {
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name = target.Name
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if target.Type == engine.Container {
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// Container name can be too long and, thus, cannot be
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// used as a key name for policy-contract storage.
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name = base58.FastBase58Encoding([]byte(target.Name))
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}
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return
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}
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func (s *ContractStorage) AddMorphRuleChain(name chain.Name, target engine.Target, c *chain.Chain) (txHash util.Uint256, vub uint32, err error) {
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if c.ID == "" {
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err = ErrEmptyChainID
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return
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}
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var kind policy.Kind
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kind, err = policyKind(target.Type)
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if err != nil {
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return
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}
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fullName := prefixedChainName(name, c.ID)
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targetName := transformNameIfContainer(target)
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txHash, vub, err = s.contractInterface.AddChain(big.NewInt(int64(kind)), targetName, fullName, c.Bytes())
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return
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}
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func (s *ContractStorage) RemoveMorphRuleChain(name chain.Name, target engine.Target, chainID chain.ID) (txHash util.Uint256, vub uint32, err error) {
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if chainID == "" {
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err = ErrEmptyChainID
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return
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}
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var kind policy.Kind
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kind, err = policyKind(target.Type)
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if err != nil {
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return
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}
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fullName := prefixedChainName(name, chainID)
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targetName := transformNameIfContainer(target)
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txHash, vub, err = s.contractInterface.RemoveChain(big.NewInt(int64(kind)), targetName, fullName)
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return
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}
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func (s *ContractStorage) ListMorphRuleChains(name chain.Name, target engine.Target) ([]*chain.Chain, error) {
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kind, err := policyKind(target.Type)
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if err != nil {
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return nil, err
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}
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targetName := transformNameIfContainer(target)
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items, err := s.contractInterface.ListChainsByPrefix(big.NewInt(int64(kind)), targetName, []byte(name))
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if err != nil {
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return nil, err
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}
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var chains []*chain.Chain
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for _, item := range items {
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serialized, err := bytesFromStackItem(item)
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if err != nil {
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return nil, err
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}
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c := new(chain.Chain)
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if err := c.DecodeBytes(serialized); err != nil {
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return nil, err
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}
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chains = append(chains, c)
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}
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return chains, nil
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}
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func bytesFromStackItem(param stackitem.Item) ([]byte, error) {
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switch param.Type() {
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case stackitem.BufferT, stackitem.ByteArrayT, stackitem.IntegerT:
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return param.TryBytes()
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case stackitem.AnyT:
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if param.Value() == nil {
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return nil, nil
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}
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fallthrough
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default:
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return nil, fmt.Errorf("chain/client: %s is not a byte array type", param.Type())
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}
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}
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func prefixedChainName(name chain.Name, chainID chain.ID) []byte {
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return []byte(strings.ToLower(fmt.Sprintf("%s:%s", name, chainID)))
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}
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func policyKind(typ engine.TargetType) (policy.Kind, error) {
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if typ == engine.Namespace {
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return policy.Namespace, nil
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} else if typ == engine.Container {
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return policy.Container, nil
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}
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return policy.Kind(0), ErrEngineTargetTypeUnsupported
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}
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