refactor!: remove gov keeper.MustMarshal (#10373)

* chore: remove gov keeper.MustMarshal

* added changelog and comments

* Update CHANGELOG.md

Co-authored-by: Amaury <[email protected]>

Co-authored-by: Amaury <[email protected]>

Author: robert-zaremba

CHANGELOG.md

@@ -97,7 +97,9 @@ Ref: https://keepachangelog.com/en/1.0.0/
   * Replace `baseapp.SetAnteHandler` with `baseapp.SetTxHandler`.
   * Move Msg routers from BaseApp to middlewares.
   * Move Baseapp panic recovery into a middleware.
-  * Rename simulation helper methods `baseapp.{Check,Deliver}` to `baseapp.Sim{Check,Deliver}`.
+  * Rename simulation helper methods `baseapp.{Check,Deliver}` to `baseapp.Sim{Check,Deliver}**.
+* (x/gov) [\#10373](https://github.com/cosmos/cosmos-sdk/pull/10373) Removed gov `keeper.{MustMarshal, MustUnmarshal}`.
+
 
 ### Client Breaking Changes
 
@@ -132,7 +134,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
-* (client) [#10226](https://github.com/cosmos/cosmos-sdk/pull/10226) Fix --home flag parsing. 
+* (client) [#10226](https://github.com/cosmos/cosmos-sdk/pull/10226) Fix --home flag parsing.
 * [#10180](https://github.com/cosmos/cosmos-sdk/issues/10180) Documentation: make references to Cosmos SDK consistent
 * (x/genutil) [#10104](https://github.com/cosmos/cosmos-sdk/pull/10104) Ensure the `init` command reads the `--home` flag value correctly.
 * [\#9651](https://github.com/cosmos/cosmos-sdk/pull/9651) Change inconsistent limit of `0` to `MaxUint64` on InfiniteGasMeter and add GasRemaining func to GasMeter.

x/gov/keeper/proposal.go

@@ -54,7 +54,8 @@ func (keeper Keeper) SubmitProposal(ctx sdk.Context, content types.Content) (typ
 	return proposal, nil
 }
 
-// GetProposal get proposal from store by ProposalID
+// GetProposal get proposal from store by ProposalID.
+// Panics if can't unmarshal the proposal.
 func (keeper Keeper) GetProposal(ctx sdk.Context, proposalID uint64) (types.Proposal, bool) {
 	store := ctx.KVStore(keeper.storeKey)
 
@@ -64,21 +65,27 @@ func (keeper Keeper) GetProposal(ctx sdk.Context, proposalID uint64) (types.Prop
 	}
 
 	var proposal types.Proposal
-	keeper.MustUnmarshalProposal(bz, &proposal)
+	if err := keeper.UnmarshalProposal(bz, &proposal); err != nil {
+		panic(err)
+	}
 
 	return proposal, true
 }
 
-// SetProposal set a proposal to store
+// SetProposal set a proposal to store.
+// Panics if can't marshal the proposal.
 func (keeper Keeper) SetProposal(ctx sdk.Context, proposal types.Proposal) {
-	store := ctx.KVStore(keeper.storeKey)
-
-	bz := keeper.MustMarshalProposal(proposal)
+	bz, err := keeper.MarshalProposal(proposal)
+	if err != nil {
+		panic(err)
+	}
 
+	store := ctx.KVStore(keeper.storeKey)
 	store.Set(types.ProposalKey(proposal.ProposalId), bz)
 }
 
-// DeleteProposal deletes a proposal from store
+// DeleteProposal deletes a proposal from store.
+// Panics if the proposal doesn't exist.
 func (keeper Keeper) DeleteProposal(ctx sdk.Context, proposalID uint64) {
 	store := ctx.KVStore(keeper.storeKey)
 	proposal, ok := keeper.GetProposal(ctx, proposalID)
@@ -90,7 +97,8 @@ func (keeper Keeper) DeleteProposal(ctx sdk.Context, proposalID uint64) {
 	store.Delete(types.ProposalKey(proposalID))
 }
 
-// IterateProposals iterates over the all the proposals and performs a callback function
+// IterateProposals iterates over the all the proposals and performs a callback function.
+// Panics when the iterator encounters a proposal which can't be unmarshaled.
 func (keeper Keeper) IterateProposals(ctx sdk.Context, cb func(proposal types.Proposal) (stop bool)) {
 	store := ctx.KVStore(keeper.storeKey)
 
@@ -209,18 +217,3 @@ func (keeper Keeper) UnmarshalProposal(bz []byte, proposal *types.Proposal) erro
 	}
 	return nil
 }
-
-func (keeper Keeper) MustMarshalProposal(proposal types.Proposal) []byte {
-	bz, err := keeper.MarshalProposal(proposal)
-	if err != nil {
-		panic(err)
-	}
-	return bz
-}
-
-func (keeper Keeper) MustUnmarshalProposal(bz []byte, proposal *types.Proposal) {
-	err := keeper.UnmarshalProposal(bz, proposal)
-	if err != nil {
-		panic(err)
-	}
-}