refactor: simplify hooks implementation (#13396)

Author: julienrbrt

Makefile

@@ -146,6 +146,7 @@ cosmovisor:
 
 
 mocks: $(MOCKS_DIR)
+	@go install github.com/golang/mock/mockgen@v1.6.0
 	sh ./scripts/mockgen.sh
 .PHONY: mocks
 

scripts/mockgen.sh

@@ -1,9 +1,8 @@
 #!/usr/bin/env bash
 
-mockgen_cmd="go run github.com/golang/mock/mockgen"
+mockgen_cmd="mockgen"
 $mockgen_cmd -source=client/account_retriever.go -package mock -destination testutil/mock/account_retriever.go
 $mockgen_cmd -package mock -destination testutil/mock/tendermint_tm_db_DB.go github.com/tendermint/tm-db DB
-$mockgen_cmd -source db/types.go -package mock -destination testutil/mock/db/types.go
 $mockgen_cmd -source=types/module/module.go -package mock -destination testutil/mock/types_module_module.go
 $mockgen_cmd -source=types/invariant.go -package mock -destination testutil/mock/types_invariant.go
 $mockgen_cmd -source=types/router.go -package mock -destination testutil/mock/types_router.go

store/tools/ics23/iavl/helpers/helpers.go

@@ -88,6 +88,9 @@ func GetNonKey(allkeys [][]byte, loc tmproofs.Where) []byte {
 // returns a list of all keys in sorted order
 func BuildTree(size int) (tree *iavl.MutableTree, keys [][]byte, err error) {
 	tree, err = iavl.NewMutableTree(db.NewMemDB(), 0)
+	if err != nil {
+		return nil, nil, err
+	}
 
 	// insert lots of info and store the bytes
 	keys = make([][]byte, size)

x/distribution/keeper/hooks.go

@@ -14,7 +14,9 @@ type Hooks struct {
 var _ stakingtypes.StakingHooks = Hooks{}
 
 // Create new distribution hooks
-func (k Keeper) Hooks() Hooks { return Hooks{k} }
+func (k Keeper) Hooks() Hooks {
+	return Hooks{k}
+}
 
 // initialize validator distribution record
 func (h Hooks) AfterValidatorCreated(ctx sdk.Context, valAddr sdk.ValAddress) error {
@@ -109,7 +111,10 @@ func (h Hooks) BeforeValidatorSlashed(ctx sdk.Context, valAddr sdk.ValAddress, f
 	return nil
 }
 
-func (h Hooks) BeforeValidatorModified(_ sdk.Context, _ sdk.ValAddress) error { return nil }
+func (h Hooks) BeforeValidatorModified(_ sdk.Context, _ sdk.ValAddress) error {
+	return nil
+}
+
 func (h Hooks) AfterValidatorBonded(_ sdk.Context, _ sdk.ConsAddress, _ sdk.ValAddress) error {
 	return nil
 }

x/gov/abci.go

@@ -24,7 +24,7 @@ func EndBlocker(ctx sdk.Context, keeper *keeper.Keeper) {
 		keeper.RefundAndDeleteDeposits(ctx, proposal.Id) // refund deposit if proposal got removed without getting 100% of the proposal
 
 		// called when proposal become inactive
-		keeper.AfterProposalFailedMinDeposit(ctx, proposal.Id)
+		keeper.Hooks().AfterProposalFailedMinDeposit(ctx, proposal.Id)
 
 		ctx.EventManager().EmitEvent(
 			sdk.NewEvent(
@@ -104,7 +104,7 @@ func EndBlocker(ctx sdk.Context, keeper *keeper.Keeper) {
 		keeper.RemoveFromActiveProposalQueue(ctx, proposal.Id, *proposal.VotingEndTime)
 
 		// when proposal become active
-		keeper.AfterProposalVotingPeriodEnded(ctx, proposal.Id)
+		keeper.Hooks().AfterProposalVotingPeriodEnded(ctx, proposal.Id)
 
 		logger.Info(
 			"proposal tallied",

x/gov/keeper/deposit.go

@@ -147,7 +147,7 @@ func (keeper Keeper) AddDeposit(ctx sdk.Context, proposalID uint64, depositorAdd
 	}
 
 	// called when deposit has been added to a proposal, however the proposal may not be active
-	keeper.AfterProposalDeposit(ctx, proposalID, depositorAddr)
+	keeper.Hooks().AfterProposalDeposit(ctx, proposalID, depositorAddr)
 
 	ctx.EventManager().EmitEvent(
 		sdk.NewEvent(

x/gov/keeper/hooks.go

@@ -92,6 +92,16 @@ func NewKeeper(
 	}
 }
 
+// Hooks gets the hooks for governance *Keeper {
+func (keeper *Keeper) Hooks() types.GovHooks {
+	if keeper.hooks == nil {
+		// return a no-op implementation if no hooks are set
+		return types.MultiGovHooks{}
+	}
+
+	return keeper.hooks
+}
+
 // SetHooks sets the hooks for governance
 func (keeper *Keeper) SetHooks(gh types.GovHooks) *Keeper {
 	if keeper.hooks != nil {

x/gov/keeper/keeper.go

@@ -82,7 +82,7 @@ func (keeper Keeper) SubmitProposal(ctx sdk.Context, messages []sdk.Msg, metadat
 	keeper.SetProposalID(ctx, proposalID+1)
 
 	// called right after a proposal is submitted
-	keeper.AfterProposalSubmission(ctx, proposalID)
+	keeper.Hooks().AfterProposalSubmission(ctx, proposalID)
 
 	ctx.EventManager().EmitEvent(
 		sdk.NewEvent(

x/gov/keeper/proposal.go

@@ -33,7 +33,7 @@ func (keeper Keeper) AddVote(ctx sdk.Context, proposalID uint64, voterAddr sdk.A
 	keeper.SetVote(ctx, vote)
 
 	// called after a vote on a proposal is cast
-	keeper.AfterProposalVote(ctx, proposalID, voterAddr)
+	keeper.Hooks().AfterProposalVote(ctx, proposalID, voterAddr)
 
 	ctx.EventManager().EmitEvent(
 		sdk.NewEvent(