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proposal_handler.go
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/
proposal_handler.go
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package params
import (
"fmt"
"math"
"time"
"github.com/evoblockchain/evochain/x/common"
govtypes "github.com/evoblockchain/evochain/x/gov/types"
"github.com/evoblockchain/evochain/x/params/types"
sdk "github.com/evoblockchain/evochain/libs/cosmos-sdk/types"
sdkerrors "github.com/evoblockchain/evochain/libs/cosmos-sdk/types/errors"
sdkparams "github.com/evoblockchain/evochain/libs/cosmos-sdk/x/params"
)
// NewParamChangeProposalHandler returns the rollback function of the param proposal handler
func NewParamChangeProposalHandler(k *Keeper) govtypes.Handler {
return func(ctx sdk.Context, proposal *govtypes.Proposal) sdk.Error {
switch c := proposal.Content.(type) {
case types.ParameterChangeProposal:
return handleParameterChangeProposal(ctx, k, proposal)
default:
return common.ErrUnknownProposalType(DefaultCodespace, fmt.Sprintf("%T", c))
}
}
}
func handleParameterChangeProposal(ctx sdk.Context, k *Keeper, proposal *govtypes.Proposal) sdk.Error {
logger := ctx.Logger().With("module", ModuleName)
logger.Info("Execute ParameterProposal begin")
paramProposal := proposal.Content.(types.ParameterChangeProposal)
curHeight := uint64(ctx.BlockHeight())
if paramProposal.Height > curHeight {
k.gk.InsertWaitingProposalQueue(ctx, paramProposal.Height, proposal.ProposalID)
return nil
}
defer k.gk.RemoveFromWaitingProposalQueue(ctx, paramProposal.Height, proposal.ProposalID)
return changeParams(ctx, k, paramProposal)
}
func changeParams(ctx sdk.Context, k *Keeper, paramProposal types.ParameterChangeProposal) sdk.Error {
defer k.signalUpdate()
for _, c := range paramProposal.Changes {
ss, ok := k.GetSubspace(c.Subspace)
if !ok {
return sdkerrors.Wrap(sdkparams.ErrUnknownSubspace, c.Subspace)
}
err := ss.Update(ctx, []byte(c.Key), []byte(c.Value))
if err != nil {
return sdkerrors.Wrap(sdkparams.ErrSettingParameter, err.Error())
}
}
return nil
}
func (k *Keeper) RegisterSignal(handler func()) {
k.signals = append(k.signals, handler)
}
func (k *Keeper) signalUpdate() {
for i, _ := range k.signals {
k.signals[i]()
}
}
func checkDenom(paramProposal types.ParameterChangeProposal) sdk.Error {
for _, c := range paramProposal.Changes {
if c.Subspace == "evm" && c.Key == "EVMDenom" {
return sdkerrors.Wrap(sdkparams.ErrSettingParameter, "evm denom can not be reset")
}
if c.Subspace == "staking" && c.Key == "BondDenom" {
return sdkerrors.Wrap(sdkparams.ErrSettingParameter, "staking bond denom can not be reset")
}
}
return nil
}
// GetMinDeposit implements ProposalHandler interface
func (keeper Keeper) GetMinDeposit(ctx sdk.Context, content govtypes.Content) (minDeposit sdk.SysCoins) {
switch content.(type) {
case types.ParameterChangeProposal:
minDeposit = keeper.GetParams(ctx).MinDeposit
}
return
}
// GetMaxDepositPeriod implements ProposalHandler interface
func (keeper Keeper) GetMaxDepositPeriod(ctx sdk.Context, content govtypes.Content) (maxDepositPeriod time.Duration) {
switch content.(type) {
case types.ParameterChangeProposal:
maxDepositPeriod = keeper.GetParams(ctx).MaxDepositPeriod
}
return
}
// GetVotingPeriod implements ProposalHandler interface
func (keeper Keeper) GetVotingPeriod(ctx sdk.Context, content govtypes.Content) (votingPeriod time.Duration) {
switch content.(type) {
case types.ParameterChangeProposal:
votingPeriod = keeper.GetParams(ctx).VotingPeriod
}
return
}
// CheckMsgSubmitProposal implements ProposalHandler interface
func (keeper Keeper) CheckMsgSubmitProposal(ctx sdk.Context, msg govtypes.MsgSubmitProposal) sdk.Error {
paramsChangeProposal := msg.Content.(types.ParameterChangeProposal)
// check message sender is current validator
if !keeper.sk.IsValidator(ctx, msg.Proposer) {
return govtypes.ErrInvalidProposer()
}
// check initial deposit more than or equal to ratio of MinDeposit
initDeposit := keeper.GetParams(ctx).MinDeposit.MulDec(sdk.NewDecWithPrec(1, 1))
if err := common.HasSufficientCoins(msg.Proposer, msg.InitialDeposit, initDeposit); err != nil {
return sdk.ErrInvalidCoins(fmt.Sprintf("InitialDeposit must not be less than %s", initDeposit.String()))
}
// check proposer has sufficient coins
if err := common.HasSufficientCoins(msg.Proposer, keeper.ck.GetCoins(ctx, msg.Proposer), msg.InitialDeposit); err != nil {
return sdk.ErrInvalidCoins(err.Error())
}
curHeight := uint64(ctx.BlockHeight())
maxHeight := keeper.GetParams(ctx).MaxBlockHeight
if maxHeight == 0 {
maxHeight = math.MaxInt64 - paramsChangeProposal.Height
}
if paramsChangeProposal.Height < curHeight || paramsChangeProposal.Height > curHeight+maxHeight {
return govtypes.ErrInvalidHeight(paramsChangeProposal.Height, curHeight, maxHeight)
}
// run simulation with cache context
cacheCtx, _ := ctx.CacheContext()
return changeParams(cacheCtx, &keeper, paramsChangeProposal)
}
// nolint
func (keeper Keeper) AfterSubmitProposalHandler(ctx sdk.Context, proposal govtypes.Proposal) {}
func (keeper Keeper) VoteHandler(ctx sdk.Context, proposal govtypes.Proposal, vote govtypes.Vote) (string, sdk.Error) {
return "", nil
}
func (keeper Keeper) AfterDepositPeriodPassed(ctx sdk.Context, proposal govtypes.Proposal) {}
func (keeper Keeper) RejectedHandler(ctx sdk.Context, content govtypes.Content) {}