feat(x/gov): implement a minimum amount per deposit

CHANGELOG.md

@@ -174,6 +174,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### State Machine Breaking
 
+* (x/gov) [#18146](https://github.com/cosmos/cosmos-sdk/pull/18146) Add denom check to reject denoms outside of those listed in `MinDeposit`. A new `MinDepositRatio` param is added (with a default value of `0.001`) and now deposits are required to be at least `MinDepositRatio*MinDeposit` to be accepted.
 * (x/distribution) [#17657](https://github.com/cosmos/cosmos-sdk/pull/17657) Migrate community pool funds from x/distribution to x/protocolpool.
 * (x/distribution) [#17115](https://github.com/cosmos/cosmos-sdk/pull/17115) Migrate `PreviousProposer` to collections.
 * (x/upgrade) [#16244](https://github.com/cosmos/cosmos-sdk/pull/16244) upgrade module no longer stores the app version but gets and sets the app version stored in the `ParamStore` of baseapp.

proto/cosmos/gov/v1/gov.proto

@@ -261,4 +261,11 @@ message Params {
 
   // burn deposits if quorum with vote type no_veto is met
   bool burn_vote_veto = 15;
+
+  // The ratio representing the proportion of the deposit value minimum that must be met when making a deposit.
+  // Default value: 0.001. Meaning that for a chain with a min_deposit of 1000stake, a deposit of 1stake would be
+  // required.
+  //
+  // Since: cosmos-sdk 0.50
+  string min_deposit_ratio = 16 [(cosmos_proto.scalar) = "cosmos.Dec"];
 }

tests/e2e/gov/deposits.go

@@ -10,7 +10,6 @@ import (
 	"cosmossdk.io/math"
 
 	"github.com/cosmos/cosmos-sdk/testutil"
-	clitestutil "github.com/cosmos/cosmos-sdk/testutil/cli"
 	"github.com/cosmos/cosmos-sdk/testutil/network"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/x/gov/client/cli"
@@ -72,33 +71,6 @@ func (s *DepositTestSuite) TearDownSuite() {
 	s.network.Cleanup()
 }
 
-func (s *DepositTestSuite) TestQueryDepositsWithoutInitialDeposit() {
-	val := s.network.Validators[0]
-
-	// submit proposal without initial deposit
-	id := s.submitProposal(val, sdk.NewCoin(s.cfg.BondDenom, math.NewInt(0)), "TestQueryDepositsWithoutInitialDeposit")
-
-	// deposit amount
-	depositAmount := sdk.NewCoin(s.cfg.BondDenom, v1.DefaultMinDepositTokens.Add(math.NewInt(50)))
-	msg := v1.NewMsgDeposit(val.Address, id, sdk.NewCoins(depositAmount))
-	_, err := clitestutil.SubmitTestTx(val.ClientCtx, msg, val.Address, clitestutil.TestTxConfig{})
-	s.Require().NoError(err)
-	s.Require().NoError(s.network.WaitForNextBlock())
-
-	// query deposit
-	proposalID := strconv.FormatUint(id, 10)
-	deposit := s.queryDeposit(val, proposalID, false, "")
-	s.Require().NotNil(deposit)
-	s.Require().Equal(depositAmount.String(), sdk.Coins(deposit.Deposit.Amount).String())
-
-	// query deposits
-	deposits := s.queryDeposits(val, proposalID, false, "")
-	s.Require().NotNil(deposits)
-	s.Require().Len(deposits.Deposits, 1)
-	// verify initial deposit
-	s.Require().Equal(depositAmount.String(), sdk.Coins(deposits.Deposits[0].Amount).String())
-}
-
 func (s *DepositTestSuite) TestQueryDepositsWithInitialDeposit() {
 	val := s.network.Validators[0]
 	depositAmount := sdk.NewCoin(s.cfg.BondDenom, v1.DefaultMinDepositTokens)