refactor: add burnable params to governance (backport #15151)

CHANGELOG.md

@@ -37,7 +37,11 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
 
-## [v0.47.0-rc3](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.0-rc3) - 2023-02-22
+## [v0.47.0-rc3](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.47.0-rc3) - 2023-03-01
+
+### Features
+
+* (x/gov) [#15151](https://github.com/cosmos/cosmos-sdk/pull/15151) Add `burn_vote_quorum`, `burn_proposal_deposit_prevote` and `burn_vote_veto` params to allow applications to decide if they would like to burn deposits
 
 ### Improvements
 

proto/cosmos/gov/v1/gov.proto

@@ -208,4 +208,13 @@ message Params {
 
   //  The ratio representing the proportion of the deposit value that must be paid at proposal submission.
   string min_initial_deposit_ratio = 7 [(cosmos_proto.scalar) = "cosmos.Dec"];
+
+  // burn deposits if a proposal does not meet quorum
+  bool burn_vote_quorum = 13;
+
+  // burn deposits if the proposal does not enter voting period
+  bool burn_proposal_deposit_prevote = 14;
+
+  // burn deposits if quorum with vote type no_veto is met
+  bool burn_vote_veto = 15;
 }

tests/e2e/gov/query.go

@@ -23,7 +23,7 @@ func (s *E2ETestSuite) TestCmdParams() {
 		{
 			"json output",
 			[]string{fmt.Sprintf("--%s=json", flags.FlagOutput)},
-			`{"voting_params":{"voting_period":"172800s"},"deposit_params":{"min_deposit":[{"denom":"stake","amount":"10000000"}],"max_deposit_period":"172800s"},"tally_params":{"quorum":"0.334000000000000000","threshold":"0.500000000000000000","veto_threshold":"0.334000000000000000"},"params":{"min_deposit":[{"denom":"stake","amount":"10000000"}],"max_deposit_period":"172800s","voting_period":"172800s","quorum":"0.334000000000000000","threshold":"0.500000000000000000","veto_threshold":"0.334000000000000000","min_initial_deposit_ratio":"0.000000000000000000"}}`,
+			`{"voting_params":{"voting_period":"172800s"},"deposit_params":{"min_deposit":[{"denom":"stake","amount":"10000000"}],"max_deposit_period":"172800s"},"tally_params":{"quorum":"0.334000000000000000","threshold":"0.500000000000000000","veto_threshold":"0.334000000000000000"},"params":{"min_deposit":[{"denom":"stake","amount":"10000000"}],"max_deposit_period":"172800s","voting_period":"172800s","quorum":"0.334000000000000000","threshold":"0.500000000000000000","veto_threshold":"0.334000000000000000","min_initial_deposit_ratio":"0.000000000000000000","burn_vote_quorum":false,"burn_proposal_deposit_prevote":false,"burn_vote_veto":true}}`,
 		},
 		{
 			"text output",
@@ -35,6 +35,9 @@ deposit_params:
   - amount: "10000000"
     denom: stake
 params:
+  burn_proposal_deposit_prevote: false
+  burn_vote_quorum: false
+  burn_vote_veto: true
   max_deposit_period: 172800s
   min_deposit:
   - amount: "10000000"

x/gov/README.md

@@ -54,7 +54,6 @@ staking token of the chain.
     * [EndBlocker](#endblocker)
     * [Handlers](#handlers)
 * [Parameters](#parameters)
-    * [SubKeys](#subkeys)
 * [Client](#client)
     * [CLI](#cli)
     * [gRPC](#grpc)
@@ -255,6 +254,16 @@ new version of the software.
 
 Validators and full nodes can use an automation tool, such as [Cosmovisor](https://docs.cosmos.network/main/tooling/cosmovisor), for automatically switching version of the chain.
 
+#### Burnable Params
+
+There are three parameters that define if the deposit of a proposal should be burned or returned to the depositors. 
+
+* `BurnVoteVeto` burns the proposal deposit if the proposal gets vetoed. 
+* `BurnVoteQuorum` burns the proposal deposit if the proposal deposit if the vote does not reach quorum.
+* `BurnProposalDepositPrevote` burns the proposal deposit if it does not enter the voting phase. 
+
+> Note: These parameters are modifiable via governance. 
+
 ## State
 
 ### Proposals
@@ -678,7 +687,7 @@ The governance module emits the following events:
 ### EndBlocker
 
 | Type              | Attribute Key   | Attribute Value  |
-| ----------------- | --------------- | ---------------- |
+|-------------------|-----------------|------------------|
 | inactive_proposal | proposal_id     | {proposalID}     |
 | inactive_proposal | proposal_result | {proposalResult} |
 | active_proposal   | proposal_id     | {proposalID}     |
@@ -689,7 +698,7 @@ The governance module emits the following events:
 #### MsgSubmitProposal
 
 | Type                | Attribute Key       | Attribute Value |
-| ------------------- | ------------------- | --------------- |
+|---------------------|---------------------|-----------------|
 | submit_proposal     | proposal_id         | {proposalID}    |
 | submit_proposal [0] | voting_period_start | {proposalID}    |
 | proposal_deposit    | amount              | {depositAmount} |
@@ -703,7 +712,7 @@ The governance module emits the following events:
 #### MsgVote
 
 | Type          | Attribute Key | Attribute Value |
-| ------------- | ------------- | --------------- |
+|---------------|---------------|-----------------|
 | proposal_vote | option        | {voteOption}    |
 | proposal_vote | proposal_id   | {proposalID}    |
 | message       | module        | governance      |
@@ -723,7 +732,7 @@ The governance module emits the following events:
 #### MsgDeposit
 
 | Type                 | Attribute Key       | Attribute Value |
-| -------------------- | ------------------- | --------------- |
+|----------------------|---------------------|-----------------|
 | proposal_deposit     | amount              | {depositAmount} |
 | proposal_deposit     | proposal_id         | {proposalID}    |
 | proposal_deposit [0] | voting_period_start | {proposalID}    |
@@ -737,22 +746,17 @@ The governance module emits the following events:
 
 The governance module contains the following parameters:
 
-| Key           | Type   | Example                                                                                            |
-|---------------|--------|----------------------------------------------------------------------------------------------------|
-| depositparams | object | {"min_deposit":[{"denom":"uatom","amount":"10000000"}],"max_deposit_period":"172800000000000"}     |
-| votingparams  | object | {"voting_period":"172800000000000"}                                                                |
-| tallyparams   | object | {"quorum":"0.334000000000000000","threshold":"0.500000000000000000","veto":"0.334000000000000000"} |
-
-### SubKeys
-
-| Key                | Type             | Example                                 |
-|--------------------|------------------|-----------------------------------------|
-| min_deposit        | array (coins)    | [{"denom":"uatom","amount":"10000000"}] |
-| max_deposit_period | string (time ns) | "172800000000000"                       |
-| voting_period      | string (time ns) | "172800000000000"                       |
-| quorum             | string (dec)     | "0.334000000000000000"                  |
-| threshold          | string (dec)     | "0.500000000000000000"                  |
-| veto               | string (dec)     | "0.334000000000000000"                  |
+| Key                           | Type             | Example                                 |
+|-------------------------------|------------------|-----------------------------------------|
+| min_deposit                   | array (coins)    | [{"denom":"uatom","amount":"10000000"}] |
+| max_deposit_period            | string (time ns) | "172800000000000" (17280s)              |
+| voting_period                 | string (time ns) | "172800000000000" (17280s)              |
+| quorum                        | string (dec)     | "0.334000000000000000"                  |
+| threshold                     | string (dec)     | "0.500000000000000000"                  |
+| veto                          | string (dec)     | "0.334000000000000000"                  |
+| burn_proposal_deposit_prevote | bool             | false                                   |
+| burn_vote_quorum              | bool             | false                                   |
+| burn_vote_veto                | bool             | true                                    |
 
 **NOTE**: The governance module contains parameters that are objects unlike other
 modules. If only a subset of parameters are desired to be changed, only they need

x/gov/abci.go

@@ -21,7 +21,12 @@ func EndBlocker(ctx sdk.Context, keeper *keeper.Keeper) {
 	// A proposal is dead when it's inactive and didn't get enough deposit on time to get into voting phase.
 	keeper.IterateInactiveProposalsQueue(ctx, ctx.BlockHeader().Time, func(proposal v1.Proposal) bool {
 		keeper.DeleteProposal(ctx, proposal.Id)
-		keeper.RefundAndDeleteDeposits(ctx, proposal.Id) // refund deposit if proposal got removed without getting 100% of the proposal
+
+		if !keeper.GetParams(ctx).BurnProposalDepositPrevote {
+			keeper.RefundAndDeleteDeposits(ctx, proposal.Id) // refund deposit if proposal got removed without getting 100% of the proposal
+		} else {
+			keeper.DeleteAndBurnDeposits(ctx, proposal.Id) // burn the deposit if proposal got removed without getting 100% of the proposal
+		}
 
 		// called when proposal become inactive
 		keeper.Hooks().AfterProposalFailedMinDeposit(ctx, proposal.Id)

x/gov/keeper/tally.go

@@ -89,7 +89,7 @@ func (keeper Keeper) Tally(ctx sdk.Context, proposal v1.Proposal) (passes bool,
 		totalVotingPower = totalVotingPower.Add(votingPower)
 	}
 
-	tallyParams := keeper.GetParams(ctx)
+	params := keeper.GetParams(ctx)
 	tallyResults = v1.NewTallyResultFromMap(results)
 
 	// TODO: Upgrade the spec to cover all of these cases & remove pseudocode.
@@ -100,9 +100,9 @@ func (keeper Keeper) Tally(ctx sdk.Context, proposal v1.Proposal) (passes bool,
 
 	// If there is not enough quorum of votes, the proposal fails
 	percentVoting := totalVotingPower.Quo(sdk.NewDecFromInt(keeper.sk.TotalBondedTokens(ctx)))
-	quorum, _ := sdk.NewDecFromStr(tallyParams.Quorum)
+	quorum, _ := sdk.NewDecFromStr(params.Quorum)
 	if percentVoting.LT(quorum) {
-		return false, false, tallyResults
+		return false, params.BurnVoteQuorum, tallyResults
 	}
 
 	// If no one votes (everyone abstains), proposal fails
@@ -111,13 +111,13 @@ func (keeper Keeper) Tally(ctx sdk.Context, proposal v1.Proposal) (passes bool,
 	}
 
 	// If more than 1/3 of voters veto, proposal fails
-	vetoThreshold, _ := sdk.NewDecFromStr(tallyParams.VetoThreshold)
+	vetoThreshold, _ := sdk.NewDecFromStr(params.VetoThreshold)
 	if results[v1.OptionNoWithVeto].Quo(totalVotingPower).GT(vetoThreshold) {
-		return false, true, tallyResults
+		return false, params.BurnVoteVeto, tallyResults
 	}
 
 	// If more than 1/2 of non-abstaining voters vote Yes, proposal passes
-	threshold, _ := sdk.NewDecFromStr(tallyParams.Threshold)
+	threshold, _ := sdk.NewDecFromStr(params.Threshold)
 	if results[v1.OptionYes].Quo(totalVotingPower.Sub(results[v1.OptionAbstain])).GT(threshold) {
 		return true, false, tallyResults
 	}

x/gov/migrations/v4/json.go

@@ -11,14 +11,19 @@ import (
 // Addition of the new min initial deposit ratio parameter that is set to 0 by default.
 // Proposals in voting period are tracked in a separate index.
 func MigrateJSON(oldState *v1.GenesisState) (*v1.GenesisState, error) {
+
+	defaultParams := v1.DefaultParams()
 	params := v1.NewParams(
 		oldState.DepositParams.MinDeposit,
 		*oldState.DepositParams.MaxDepositPeriod,
 		*oldState.VotingParams.VotingPeriod,
 		oldState.TallyParams.Quorum,
 		oldState.TallyParams.Threshold,
 		oldState.TallyParams.VetoThreshold,
-		v1.DefaultParams().MinInitialDepositRatio,
+		defaultParams.MinInitialDepositRatio,
+		defaultParams.BurnProposalDepositPrevote,
+		defaultParams.BurnVoteQuorum,
+		defaultParams.BurnVoteVeto,
 	)
 
 	return &v1.GenesisState{

x/gov/migrations/v4/json_test.go

@@ -59,6 +59,9 @@ func TestMigrateJSON(t *testing.T) {
 	"deposit_params": null,
 	"deposits": [],
 	"params": {
+		"burn_proposal_deposit_prevote": false,
+		"burn_vote_quorum": false,
+		"burn_vote_veto": true,
 		"max_deposit_period": "172800s",
 		"min_deposit": [
 			{

x/gov/migrations/v4/store.go

@@ -24,6 +24,7 @@ func migrateParams(ctx sdk.Context, storeKey storetypes.StoreKey, legacySubspace
 	legacySubspace.Get(ctx, govv1.ParamStoreKeyVotingParams, &vp)
 	legacySubspace.Get(ctx, govv1.ParamStoreKeyTallyParams, &tp)
 
+	defaultParams := govv1.DefaultParams()
 	params := govv1.NewParams(
 		dp.MinDeposit,
 		*dp.MaxDepositPeriod,
@@ -32,6 +33,9 @@ func migrateParams(ctx sdk.Context, storeKey storetypes.StoreKey, legacySubspace
 		tp.Threshold,
 		tp.VetoThreshold,
 		sdk.ZeroDec().String(),
+		defaultParams.BurnProposalDepositPrevote,
+		defaultParams.BurnVoteQuorum,
+		defaultParams.BurnVoteVeto,
 	)
 
 	bz, err := cdc.Marshal(&params)

x/gov/simulation/genesis.go

@@ -111,7 +111,7 @@ func RandomizedGenState(simState *module.SimulationState) {
 
 	govGenesis := v1.NewGenesisState(
 		startingProposalID,
-		v1.NewParams(minDeposit, depositPeriod, votingPeriod, quorum.String(), threshold.String(), veto.String(), minInitialDepositRatio.String()),
+		v1.NewParams(minDeposit, depositPeriod, votingPeriod, quorum.String(), threshold.String(), veto.String(), minInitialDepositRatio.String(), simState.Rand.Intn(2) == 0, simState.Rand.Intn(2) == 0, simState.Rand.Intn(2) == 0),
 	)
 
 	bz, err := json.MarshalIndent(&govGenesis, "", " ")