refactor(x/staking): Migrate UnbondingID to collections

CHANGELOG.md

@@ -60,6 +60,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### API Breaking Changes
 
+* (x/staking) [#17256](https://github.com/cosmos/cosmos-sdk/pull/17256) Use collections for `UnbondingID`.
 * (x/staking) [#17248](https://github.com/cosmos/cosmos-sdk/pull/17248) Use collections for `UnbondingType`.
     * remove from `types`: `GetUnbondingTypeKey`.
 * (client) [#17259](https://github.com/cosmos/cosmos-sdk/pull/17259) Remove deprecated `clientCtx.PrintObjectLegacy`. Use `clientCtx.PrintProto` or `clientCtx.PrintRaw` instead.

x/staking/keeper/keeper.go

@@ -37,6 +37,7 @@ type Keeper struct {
 	LastTotalPower         collections.Item[math.Int]
 	ValidatorUpdates       collections.Item[types.ValidatorUpdates]
 	DelegationsByValidator collections.Map[collections.Pair[sdk.ValAddress, sdk.AccAddress], []byte]
+	UnbondingID            collections.Sequence
 	UnbondingType          collections.Map[uint64, uint64]
 }
 
@@ -87,6 +88,7 @@ func NewKeeper(
 			collections.PairKeyCodec(sdk.LengthPrefixedAddressKey(sdk.ValAddressKey), sdk.AccAddressKey), // nolint: staticcheck // sdk.LengthPrefixedAddressKey is needed to retain state compatibility
 			collections.BytesValue,
 		),
+		UnbondingID:   collections.NewSequence(sb, types.UnbondingIDKey, "unbonding_id"),
 		UnbondingType: collections.NewMap(sb, types.UnbondingTypeKey, "unbonding_type", collections.Uint64Key, collections.Uint64Value),
 	}
 

x/staking/keeper/unbonding.go

@@ -2,7 +2,7 @@
 
 import (
 	"context"
 	"encoding/binary"
 	"errors"
 
 	"cosmossdk.io/collections"
@@ -14,23 +14,14 @@
 
 // IncrementUnbondingID increments and returns a unique ID for an unbonding operation
 func (k Keeper) IncrementUnbondingID(ctx context.Context) (unbondingID uint64, err error) {
-	store := k.storeService.OpenKVStore(ctx)
-	bz, err := store.Get(types.UnbondingIDKey)
+	unbondingID, err = k.UnbondingID.Next(ctx)
 	if err != nil {
 		return 0, err
 	}
-
-	if bz != nil {
-		unbondingID = binary.BigEndian.Uint64(bz)
-	}
-
 	unbondingID++
 
-	// Convert back into bytes for storage
-	bz = make([]byte, 8)
-	binary.BigEndian.PutUint64(bz, unbondingID)
-
-	if err = store.Set(types.UnbondingIDKey, bz); err != nil {
+	err = k.UnbondingID.Set(ctx, unbondingID)
+	if err != nil {
 		return 0, err
 	}
 

x/staking/types/keys.go

@@ -45,7 +45,7 @@ var (
 	RedelegationByValSrcIndexKey     = []byte{0x35} // prefix for each key for an redelegation, by source validator operator
 	RedelegationByValDstIndexKey     = []byte{0x36} // prefix for each key for an redelegation, by destination validator operator
 
-	UnbondingIDKey    = []byte{0x37}              // key for the counter for the incrementing id for UnbondingOperations
+	UnbondingIDKey    = collections.NewPrefix(55) // key for the counter for the incrementing id for UnbondingOperations
 	UnbondingIndexKey = []byte{0x38}              // prefix for an index for looking up unbonding operations by their IDs
 	UnbondingTypeKey  = collections.NewPrefix(57) // prefix for an index containing the type of unbonding operations