refactor: eliminate unnecessary nil check in BigEndianToUint64 function

x/crosschain/keeper/attestation.go

@@ -246,10 +246,5 @@ func (k Keeper) SetLastEventBlockHeightByOracle(ctx sdk.Context, oracleAddr sdk.
 // GetLastEventBlockHeightByOracle get the latest event blockHeight for a give oracle
 func (k Keeper) GetLastEventBlockHeightByOracle(ctx sdk.Context, oracleAddr sdk.AccAddress) uint64 {
 	store := ctx.KVStore(k.storeKey)
-	key := types.GetLastEventBlockHeightByOracleKey(oracleAddr)
-	if !store.Has(key) {
-		return 0
-	}
-	data := store.Get(key)
-	return sdk.BigEndianToUint64(data)
+	return sdk.BigEndianToUint64(store.Get(types.GetLastEventBlockHeightByOracleKey(oracleAddr)))
 }

x/crosschain/keeper/batch_confirm.go

@@ -65,11 +65,7 @@ func (k Keeper) SetLastSlashedBatchBlock(ctx sdk.Context, blockHeight uint64) {
 // GetLastSlashedBatchBlock returns the latest slashed Batch block
 func (k Keeper) GetLastSlashedBatchBlock(ctx sdk.Context) uint64 {
 	store := ctx.KVStore(k.storeKey)
-	bytes := store.Get(types.LastSlashedBatchBlock)
-	if len(bytes) == 0 {
-		return 0
-	}
-	return sdk.BigEndianToUint64(bytes)
+	return sdk.BigEndianToUint64(store.Get(types.LastSlashedBatchBlock))
 }
 
 // GetUnSlashedBatches returns all the unSlashed batches in state

x/crosschain/keeper/observed.go

@@ -11,11 +11,7 @@ import (
 // GetLastObservedEventNonce returns the latest observed event nonce
 func (k Keeper) GetLastObservedEventNonce(ctx sdk.Context) uint64 {
 	store := ctx.KVStore(k.storeKey)
-	bytes := store.Get(types.LastObservedEventNonceKey)
-	if len(bytes) == 0 {
-		return 0
-	}
-	return sdk.BigEndianToUint64(bytes)
+	return sdk.BigEndianToUint64(store.Get(types.LastObservedEventNonceKey))
 }
 
 // SetLastObservedEventNonce sets the latest observed event nonce

x/crosschain/keeper/oracle.go

@@ -226,9 +226,5 @@ func (k Keeper) SetLastOracleSlashBlockHeight(ctx sdk.Context, blockHeight uint6
 // GetLastOracleSlashBlockHeight returns the last proposal block height
 func (k Keeper) GetLastOracleSlashBlockHeight(ctx sdk.Context) uint64 {
 	store := ctx.KVStore(k.storeKey)
-	data := store.Get(types.LastOracleSlashBlockHeight)
-	if len(data) == 0 {
-		return 0
-	}
-	return sdk.BigEndianToUint64(data)
+	return sdk.BigEndianToUint64(store.Get(types.LastOracleSlashBlockHeight))
 }

x/crosschain/keeper/oracle_set.go

@@ -184,11 +184,7 @@ func (k Keeper) SetLatestOracleSetNonce(ctx sdk.Context, nonce uint64) {
 // GetLatestOracleSetNonce returns the latest oracleSet nonce
 func (k Keeper) GetLatestOracleSetNonce(ctx sdk.Context) uint64 {
 	store := ctx.KVStore(k.storeKey)
-	data := store.Get(types.LatestOracleSetNonce)
-	if len(data) == 0 {
-		return 0
-	}
-	return sdk.BigEndianToUint64(data)
+	return sdk.BigEndianToUint64(store.Get(types.LatestOracleSetNonce))
 }
 
 // GetUnSlashedOracleSets returns all the unSlashed oracle sets in state

x/crosschain/keeper/oracle_set_confirm.go

@@ -65,9 +65,5 @@ func (k Keeper) SetLastSlashedOracleSetNonce(ctx sdk.Context, nonce uint64) {
 // GetLastSlashedOracleSetNonce returns the latest slashed oracleSet nonce
 func (k Keeper) GetLastSlashedOracleSetNonce(ctx sdk.Context) uint64 {
 	store := ctx.KVStore(k.storeKey)
-	data := store.Get(types.LastSlashedOracleSetNonce)
-	if len(data) == 0 {
-		return 0
-	}
-	return sdk.BigEndianToUint64(data)
+	return sdk.BigEndianToUint64(store.Get(types.LastSlashedOracleSetNonce))
 }