chore(fmt/linters): enable nilerr, nilnil, nolintlint and fix related…

… issues (celestiaorg#3332)

Enables nilerr, nilnil, nolintlint checks as well as fixing issues found
by those linters

.golangci.yml

@@ -29,6 +29,9 @@ linters:
     - misspell
     # - maligned
     - nakedret
+    - nilerr
+    - nilnil
+    - nolintlint
     - prealloc
     # - scopelint - deprecated since v1.39. exportloopref will be used instead
     - exportloopref

core/eds.go

@@ -28,7 +28,7 @@ import (
 // nil is returned in place of the eds.
 func extendBlock(data types.Data, appVersion uint64, options ...nmt.Option) (*rsmt2d.ExtendedDataSquare, error) {
 	if app.IsEmptyBlock(data, appVersion) {
-		return nil, nil
+		return share.EmptyExtendedDataSquare(), nil
 	}
 
 	// Construct the data square from the block's transactions
@@ -62,7 +62,7 @@ func storeEDS(
 	store *eds.Store,
 	window pruner.AvailabilityWindow,
 ) error {
-	if eds == nil {
+	if eds.Equals(share.EmptyExtendedDataSquare()) {
 		return nil
 	}
 

core/eds_test.go

@@ -24,7 +24,7 @@ func TestTrulyEmptySquare(t *testing.T) {
 
 	eds, err := extendBlock(data, appconsts.LatestVersion)
 	require.NoError(t, err)
-	assert.Nil(t, eds)
+	require.True(t, eds.Equals(share.EmptyExtendedDataSquare()))
 }
 
 // TestNonZeroSquareSize tests that the DAH hash of a block with no transactions
@@ -39,8 +39,8 @@ func TestEmptySquareWithZeroTxs(t *testing.T) {
 	}
 
 	eds, err := extendBlock(data, appconsts.LatestVersion)
-	require.Nil(t, eds)
 	require.NoError(t, err)
+	require.True(t, eds.Equals(share.EmptyExtendedDataSquare()))
 
 	// force extend the square using an empty block and compare with the min DAH
 	eds, err = app.ExtendBlock(data, appconsts.LatestVersion)

das/daser_test.go

@@ -432,9 +432,9 @@ func (m getterStub) GetRangeByHeight(
 	*header.ExtendedHeader,
 	uint64,
 ) ([]*header.ExtendedHeader, error) {
-	return nil, nil
+	panic("implement me")
 }
 
 func (m getterStub) Get(context.Context, libhead.Hash) (*header.ExtendedHeader, error) {
-	return nil, nil
+	panic("implement me")
 }

nodebuilder/fraud/lifecycle.go

@@ -69,7 +69,7 @@ func (breaker *ServiceBreaker[S, H]) Stop(ctx context.Context) error {
 
 	if breaker.ctx.Err() != nil {
 		// short circuit if the service was already stopped
-		return nil
+		return nil //nolint:nilerr
 	}
 
 	breaker.sub.Cancel()

nodebuilder/node/metrics.go

@@ -2,6 +2,7 @@ package node
 
 import (
 	"context"
+	"fmt"
 	"time"
 
 	logging "github.com/ipfs/go-log/v2"
@@ -72,7 +73,7 @@ func WithMetrics(lc fx.Lifecycle) error {
 
 	clientReg, err := meter.RegisterCallback(callback, nodeStartTS, totalNodeRunTime, buildInfoGauge)
 	if err != nil {
-		return nil
+		return fmt.Errorf("failed to register metrics callback: %w", err)
 	}
 
 	lc.Append(

share/eds/blockstore.go

@@ -47,7 +47,7 @@ func (bs *blockstore) Has(ctx context.Context, cid cid.Cid) (bool, error) {
 		// key wasn't found in top level blockstore, but could be in datastore while being reconstructed
 		dsHas, dsErr := bs.ds.Has(ctx, dshelp.MultihashToDsKey(cid.Hash()))
 		if dsErr != nil {
-			return false, nil
+			return false, nil //nolint:nilerr // return false if error
 		}
 		return dsHas, nil
 	}

share/p2p/discovery/discovery.go

@@ -294,7 +294,7 @@ func (d *Discovery) discover(ctx context.Context) bool {
 			wg.Go(func() error {
 				if findCtx.Err() != nil {
 					log.Debug("find has been canceled, skip peer")
-					return nil
+					return nil //nolint:nilerr
 				}
 
 				// we don't pass findCtx so that we don't cancel in progress connections

state/core_access.go

@@ -610,7 +610,7 @@ func (ca *CoreAccessor) GrantFee(
 
 	msg, err := feegrant.NewMsgGrantAllowance(allowance, granter, grantee)
 	if err != nil {
-		return nil, nil
+		return nil, err
 	}
 
 	resp, err := signer.SubmitTx(ctx, []sdktypes.Msg{msg}, user.SetGasLimit(gasLim), withFee(fee))