[staking] make contract staking indexer nullable

action/protocol/staking/contractstake_indexer.go

@@ -29,38 +29,4 @@ type (
 		// BucketTypes returns the active bucket types
 		BucketTypes() ([]*ContractStakingBucketType, error)
 	}
-
-	// TODO (iip-13): remove this empty contract staking indexer
-	emptyContractStakingIndexer struct{}
 )
-
-var _ ContractStakingIndexer = (*emptyContractStakingIndexer)(nil)
-
-// NewEmptyContractStakingIndexer creates an empty contract staking indexer
-func NewEmptyContractStakingIndexer() ContractStakingIndexer {
-	return &emptyContractStakingIndexer{}
-}
-
-func (f *emptyContractStakingIndexer) CandidateVotes(ownerAddr address.Address) *big.Int {
-	return big.NewInt(0)
-}
-
-func (f *emptyContractStakingIndexer) Buckets() ([]*VoteBucket, error) {
-	return nil, nil
-}
-
-func (f *emptyContractStakingIndexer) BucketsByIndices([]uint64) ([]*VoteBucket, error) {
-	return nil, nil
-}
-
-func (f *emptyContractStakingIndexer) TotalBucketCount() uint64 {
-	return 0
-}
-
-func (f *emptyContractStakingIndexer) BucketTypes() ([]*ContractStakingBucketType, error) {
-	return nil, nil
-}
-
-func (f *emptyContractStakingIndexer) BucketsByCandidate(ownerAddr address.Address) ([]*VoteBucket, error) {
-	return nil, nil
-}

action/protocol/staking/handlers_test.go

@@ -84,7 +84,7 @@ func TestProtocol_HandleCreateStake(t *testing.T) {
 	p, err := NewProtocol(depositGas, &BuilderConfig{
 		Staking:                  genesis.Default.Staking,
 		PersistStakingPatchBlock: math.MaxUint64,
-	}, nil, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight)
+	}, nil, nil, genesis.Default.GreenlandBlockHeight)
 	require.NoError(err)
 
 	// set up candidate
@@ -2680,7 +2680,7 @@ func initAll(t *testing.T, ctrl *gomock.Controller) (protocol.StateManager, *Pro
 	p, err := NewProtocol(depositGas, &BuilderConfig{
 		Staking:                  genesis.Default.Staking,
 		PersistStakingPatchBlock: math.MaxUint64,
-	}, nil, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight)
+	}, nil, nil, genesis.Default.GreenlandBlockHeight)
 	require.NoError(err)
 
 	// set up candidate

action/protocol/staking/protocol.go

@@ -471,11 +471,11 @@ func (p *Protocol) ActiveCandidates(ctx context.Context, sr protocol.StateReader
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to get ActiveCandidates")
 	}
-	featureCtx, ok := protocol.GetFeatureCtx(ctx)
 	list := c.AllCandidates()
 	cand := make(CandidateList, 0, len(list))
+	featureCtx := protocol.MustGetFeatureCtx(ctx)
 	for i := range list {
-		if ok && featureCtx.AddContractStakingVotes {
+		if p.contractStakingIndexer != nil && featureCtx.AddContractStakingVotes {
 			list[i].Votes.Add(list[i].Votes, p.contractStakingIndexer.CandidateVotes(list[i].Owner))
 		}
 		if list[i].SelfStake.Cmp(p.config.RegistrationConsts.MinSelfStake) >= 0 {

action/protocol/staking/protocol_test.go

@@ -89,7 +89,7 @@ func TestProtocol(t *testing.T) {
 	stk, err := NewProtocol(nil, &BuilderConfig{
 		Staking:                  genesis.Default.Staking,
 		PersistStakingPatchBlock: math.MaxUint64,
-	}, nil, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight)
+	}, nil, nil, genesis.Default.GreenlandBlockHeight)
 	r.NotNil(stk)
 	r.NoError(err)
 	buckets, _, err := csr.getAllBuckets()
@@ -199,7 +199,7 @@ func TestCreatePreStates(t *testing.T) {
 	p, err := NewProtocol(nil, &BuilderConfig{
 		Staking:                  genesis.Default.Staking,
 		PersistStakingPatchBlock: math.MaxUint64,
-	}, nil, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight, genesis.Default.GreenlandBlockHeight)
+	}, nil, nil, genesis.Default.GreenlandBlockHeight, genesis.Default.GreenlandBlockHeight)
 	require.NoError(err)
 	ctx := protocol.WithBlockCtx(
 		genesis.WithGenesisContext(context.Background(), genesis.Default),
@@ -262,7 +262,7 @@ func Test_CreatePreStatesWithRegisterProtocol(t *testing.T) {
 	p, err := NewProtocol(nil, &BuilderConfig{
 		Staking:                  genesis.Default.Staking,
 		PersistStakingPatchBlock: math.MaxUint64,
-	}, cbi, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight, genesis.Default.GreenlandBlockHeight)
+	}, cbi, nil, genesis.Default.GreenlandBlockHeight, genesis.Default.GreenlandBlockHeight)
 	require.NoError(err)
 
 	rol := rolldpos.NewProtocol(23, 4, 3)
@@ -378,7 +378,7 @@ func Test_CreateGenesisStates(t *testing.T) {
 		p, err := NewProtocol(nil, &BuilderConfig{
 			Staking:                  cfg,
 			PersistStakingPatchBlock: math.MaxUint64,
-		}, nil, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight)
+		}, nil, nil, genesis.Default.GreenlandBlockHeight)
 		require.NoError(err)
 
 		v, err := p.Start(ctx, sm)

action/protocol/staking/staking_statereader.go

@@ -66,6 +66,12 @@ func (c *compositeStakingStateReader) readStateBuckets(ctx context.Context, req
 			return nil, 0, err
 		}
 	}
+
+	if !c.isContractStakingEnabled() {
+		buckets.Buckets = getPageOfArray(buckets.Buckets, int(req.GetPagination().GetOffset()), int(req.GetPagination().GetLimit()))
+		return buckets, height, nil
+	}
+
 	// read LSD buckets
 	lsdBuckets, err := c.contractIndexer.Buckets()
 	if err != nil {
@@ -75,7 +81,6 @@ func (c *compositeStakingStateReader) readStateBuckets(ctx context.Context, req
 	if err != nil {
 		return nil, 0, err
 	}
-
 	// merge native and LSD buckets
 	buckets.Buckets = append(buckets.Buckets, lsdIoTeXBuckets.Buckets...)
 	buckets.Buckets = getPageOfArray(buckets.Buckets, int(req.GetPagination().GetOffset()), int(req.GetPagination().GetLimit()))
@@ -88,6 +93,10 @@ func (c *compositeStakingStateReader) readStateBucketsByVoter(ctx context.Contex
 	if err != nil {
 		return nil, 0, err
 	}
+	if !c.isContractStakingEnabled() {
+		buckets.Buckets = getPageOfArray(buckets.Buckets, int(req.GetPagination().GetOffset()), int(req.GetPagination().GetLimit()))
+		return buckets, height, err
+	}
 
 	// read LSD buckets
 	lsdBuckets, err := c.contractIndexer.Buckets()
@@ -99,7 +108,6 @@ func (c *compositeStakingStateReader) readStateBucketsByVoter(ctx context.Contex
 	if err != nil {
 		return nil, 0, err
 	}
-
 	// merge native and LSD buckets
 	buckets.Buckets = append(buckets.Buckets, lsdIoTeXBuckets.Buckets...)
 	buckets.Buckets = getPageOfArray(buckets.Buckets, int(req.GetPagination().GetOffset()), int(req.GetPagination().GetLimit()))
@@ -112,6 +120,12 @@ func (c *compositeStakingStateReader) readStateBucketsByCandidate(ctx context.Co
 	if err != nil {
 		return nil, 0, err
 	}
+
+	if !c.isContractStakingEnabled() {
+		buckets.Buckets = getPageOfArray(buckets.Buckets, int(req.GetPagination().GetOffset()), int(req.GetPagination().GetLimit()))
+		return buckets, height, err
+	}
+
 	// read LSD buckets
 	candidate := c.nativeSR.GetCandidateByName(req.GetCandName())
 	if candidate == nil {
@@ -137,6 +151,10 @@ func (c *compositeStakingStateReader) readStateBucketByIndices(ctx context.Conte
 	if err != nil {
 		return nil, 0, err
 	}
+	if !c.isContractStakingEnabled() {
+		return buckets, height, nil
+	}
+
 	// read LSD buckets
 	lsdBuckets, err := c.contractIndexer.BucketsByIndices(req.GetIndex())
 	if err != nil {
@@ -156,6 +174,9 @@ func (c *compositeStakingStateReader) readStateBucketCount(ctx context.Context,
 	if err != nil {
 		return nil, 0, err
 	}
+	if !c.isContractStakingEnabled() {
+		return bucketCnt, height, nil
+	}
 	buckets, err := c.contractIndexer.Buckets()
 	if err != nil {
 		return nil, 0, err
@@ -192,11 +213,12 @@ func (c *compositeStakingStateReader) readStateCandidates(ctx context.Context, r
 			return nil, 0, err
 		}
 	}
-
 	if !protocol.MustGetFeatureCtx(ctx).AddContractStakingVotes {
 		return candidates, height, nil
 	}
-
+	if !c.isContractStakingEnabled() {
+		return candidates, height, nil
+	}
 	for _, candidate := range candidates.Candidates {
 		if err = addContractStakingVotes(candidate, c.contractIndexer); err != nil {
 			return nil, 0, err
@@ -210,6 +232,9 @@ func (c *compositeStakingStateReader) readStateCandidateByName(ctx context.Conte
 	if err != nil {
 		return nil, 0, err
 	}
+	if !c.isContractStakingEnabled() {
+		return candidate, height, nil
+	}
 	if !protocol.MustGetFeatureCtx(ctx).AddContractStakingVotes {
 		return candidate, height, nil
 	}
@@ -224,6 +249,9 @@ func (c *compositeStakingStateReader) readStateCandidateByAddress(ctx context.Co
 	if err != nil {
 		return nil, 0, err
 	}
+	if !c.isContractStakingEnabled() {
+		return candidate, height, nil
+	}
 	if !protocol.MustGetFeatureCtx(ctx).AddContractStakingVotes {
 		return candidate, height, nil
 	}
@@ -243,7 +271,9 @@ func (c *compositeStakingStateReader) readStateTotalStakingAmount(ctx context.Co
 	if !ok {
 		return nil, 0, errors.Errorf("invalid balance %s", accountMeta.Balance)
 	}
-
+	if !c.isContractStakingEnabled() {
+		return accountMeta, height, nil
+	}
 	// add contract staking amount
 	buckets, err := c.contractIndexer.Buckets()
 	if err != nil {
@@ -258,6 +288,9 @@ func (c *compositeStakingStateReader) readStateTotalStakingAmount(ctx context.Co
 }
 
 func (c *compositeStakingStateReader) readStateContractStakingBucketTypes(ctx context.Context, _ *iotexapi.ReadStakingDataRequest_ContractStakingBucketTypes) (*iotextypes.ContractStakingBucketTypeList, uint64, error) {
+	if !c.isContractStakingEnabled() {
+		return &iotextypes.ContractStakingBucketTypeList{}, c.nativeSR.Height(), nil
+	}
 	bts, err := c.contractIndexer.BucketTypes()
 	if err != nil {
 		return nil, 0, err
@@ -272,6 +305,10 @@ func (c *compositeStakingStateReader) readStateContractStakingBucketTypes(ctx co
 	return &iotextypes.ContractStakingBucketTypeList{BucketTypes: pbBts}, c.nativeSR.Height(), nil
 }
 
+func (c *compositeStakingStateReader) isContractStakingEnabled() bool {
+	return c.contractIndexer != nil
+}
+
 func addContractStakingVotes(candidate *iotextypes.CandidateV2, contractStakingSR ContractStakingIndexer) error {
 	votes, ok := big.NewInt(0).SetString(candidate.TotalWeightedVotes, 10)
 	if !ok {

action/protocol/staking/validations_test.go

@@ -21,7 +21,7 @@ func initTestProtocol(t *testing.T) (*Protocol, []*Candidate) {
 	p, err := NewProtocol(nil, &BuilderConfig{
 		Staking:                  genesis.Default.Staking,
 		PersistStakingPatchBlock: math.MaxUint64,
-	}, nil, &emptyContractStakingIndexer{}, genesis.Default.GreenlandBlockHeight)
+	}, nil, nil, genesis.Default.GreenlandBlockHeight)
 	require.NoError(err)
 
 	var cans []*Candidate

action/protocol/staking/vote_reviser_test.go

@@ -121,7 +121,7 @@ func TestVoteReviser(t *testing.T) {
 			PersistStakingPatchBlock: math.MaxUint64,
 		},
 		nil,
-		&emptyContractStakingIndexer{},
+		nil,
 		genesis.Default.OkhotskBlockHeight,
 		genesis.Default.HawaiiBlockHeight,
 		genesis.Default.GreenlandBlockHeight,

blockindex/contractstaking/indexer.go

@@ -15,7 +15,6 @@ import (
 	"github.com/pkg/errors"
 
 	"github.com/iotexproject/iotex-core/blockchain/block"
-	"github.com/iotexproject/iotex-core/blockchain/blockdao"
 	"github.com/iotexproject/iotex-core/db"
 	"github.com/iotexproject/iotex-core/pkg/util/byteutil"
 )
@@ -25,25 +24,6 @@ const (
 )
 
 type (
-	// ContractIndexer defines the interface of contract staking reader
-	ContractIndexer interface {
-		blockdao.BlockIndexerWithStart
-
-		// CandidateVotes returns the total staked votes of a candidate
-		// candidate identified by owner address
-		CandidateVotes(ownerAddr address.Address) *big.Int
-		// Buckets returns active buckets
-		Buckets() ([]*Bucket, error)
-		// BucketsByIndices returns active buckets by indices
-		BucketsByIndices([]uint64) ([]*Bucket, error)
-		// BucketsByCandidate returns active buckets by candidate
-		BucketsByCandidate(ownerAddr address.Address) ([]*Bucket, error)
-		// TotalBucketCount returns the total number of buckets including burned buckets
-		TotalBucketCount() uint64
-		// BucketTypes returns the active bucket types
-		BucketTypes() ([]*BucketType, error)
-	}
-
 	// Indexer is the contract staking indexer
 	// Main functions:
 	// 		1. handle contract staking contract events when new block comes to generate index data