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export.go
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export.go
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package app
import (
"encoding/json"
"fmt"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/auth"
distr "github.com/cosmos/cosmos-sdk/x/distribution"
"github.com/cosmos/cosmos-sdk/x/gov"
"github.com/cosmos/cosmos-sdk/x/mint"
"github.com/cosmos/cosmos-sdk/x/slashing"
stake "github.com/cosmos/cosmos-sdk/x/stake"
abci "github.com/tendermint/tendermint/abci/types"
tmtypes "github.com/tendermint/tendermint/types"
)
// export the state of gaia for a genesis file
func (app *GaiaApp) ExportAppStateAndValidators(forZeroHeight bool) (
appState json.RawMessage, validators []tmtypes.GenesisValidator, err error) {
// as if they could withdraw from the start of the next block
ctx := app.NewContext(true, abci.Header{Height: app.LastBlockHeight()})
if forZeroHeight {
app.prepForZeroHeightGenesis(ctx)
}
// iterate to get the accounts
accounts := []GenesisAccount{}
appendAccount := func(acc auth.Account) (stop bool) {
account := NewGenesisAccountI(acc)
accounts = append(accounts, account)
return false
}
app.accountKeeper.IterateAccounts(ctx, appendAccount)
genState := NewGenesisState(
accounts,
auth.ExportGenesis(ctx, app.feeCollectionKeeper),
stake.ExportGenesis(ctx, app.stakeKeeper),
mint.ExportGenesis(ctx, app.mintKeeper),
distr.ExportGenesis(ctx, app.distrKeeper),
gov.ExportGenesis(ctx, app.govKeeper),
slashing.ExportGenesis(ctx, app.slashingKeeper),
)
appState, err = codec.MarshalJSONIndent(app.cdc, genState)
if err != nil {
return nil, nil, err
}
validators = stake.WriteValidators(ctx, app.stakeKeeper)
return appState, validators, nil
}
// prepare for fresh start at zero height
func (app *GaiaApp) prepForZeroHeightGenesis(ctx sdk.Context) {
/* TODO XXX check some invariants */
height := ctx.BlockHeight()
valAccum := sdk.ZeroDec()
vdiIter := func(_ int64, vdi distr.ValidatorDistInfo) bool {
lastValPower := app.stakeKeeper.GetLastValidatorPower(ctx, vdi.OperatorAddr)
valAccum = valAccum.Add(vdi.GetValAccum(height, sdk.NewDecFromInt(lastValPower)))
return false
}
app.distrKeeper.IterateValidatorDistInfos(ctx, vdiIter)
lastTotalPower := sdk.NewDecFromInt(app.stakeKeeper.GetLastTotalPower(ctx))
totalAccum := app.distrKeeper.GetFeePool(ctx).GetTotalValAccum(height, lastTotalPower)
if !totalAccum.Equal(valAccum) {
panic(fmt.Errorf("validator accum invariance: \n\tfee pool totalAccum: %v"+
"\n\tvalidator accum \t%v\n", totalAccum.String(), valAccum.String()))
}
fmt.Printf("accum invariant ok!\n")
/* END TODO XXX */
/* Handle fee distribution state. */
// withdraw all delegator & validator rewards
vdiIter = func(_ int64, valInfo distr.ValidatorDistInfo) (stop bool) {
err := app.distrKeeper.WithdrawValidatorRewardsAll(ctx, valInfo.OperatorAddr)
if err != nil {
panic(err)
}
return false
}
app.distrKeeper.IterateValidatorDistInfos(ctx, vdiIter)
ddiIter := func(_ int64, distInfo distr.DelegationDistInfo) (stop bool) {
err := app.distrKeeper.WithdrawDelegationReward(
ctx, distInfo.DelegatorAddr, distInfo.ValOperatorAddr)
if err != nil {
panic(err)
}
return false
}
app.distrKeeper.IterateDelegationDistInfos(ctx, ddiIter)
// delete all distribution infos
// these will be recreated in InitGenesis
app.distrKeeper.RemoveValidatorDistInfos(ctx)
app.distrKeeper.RemoveDelegationDistInfos(ctx)
// assert that the fee pool is empty
feePool := app.distrKeeper.GetFeePool(ctx)
if !feePool.TotalValAccum.Accum.IsZero() {
panic("unexpected leftover validator accum")
}
bondDenom := app.stakeKeeper.GetParams(ctx).BondDenom
if !feePool.ValPool.AmountOf(bondDenom).IsZero() {
panic(fmt.Sprintf("unexpected leftover validator pool coins: %v",
feePool.ValPool.AmountOf(bondDenom).String()))
}
// reset fee pool height, save fee pool
feePool.TotalValAccum.UpdateHeight = 0
app.distrKeeper.SetFeePool(ctx, feePool)
/* Handle stake state. */
// iterate through validators by power descending, reset bond height, update bond intra-tx counter
store := ctx.KVStore(app.keyStake)
iter := sdk.KVStoreReversePrefixIterator(store, stake.ValidatorsByPowerIndexKey)
counter := int16(0)
for ; iter.Valid(); iter.Next() {
addr := sdk.ValAddress(iter.Value())
validator, found := app.stakeKeeper.GetValidator(ctx, addr)
if !found {
panic("expected validator, not found")
}
validator.BondHeight = 0
validator.BondIntraTxCounter = counter
validator.UnbondingHeight = 0
app.stakeKeeper.SetValidator(ctx, validator)
counter++
}
iter.Close()
/* Handle slashing state. */
// we have to clear the slashing periods, since they reference heights
app.slashingKeeper.DeleteValidatorSlashingPeriods(ctx)
// reset start height on signing infos
app.slashingKeeper.IterateValidatorSigningInfos(ctx, func(addr sdk.ConsAddress, info slashing.ValidatorSigningInfo) (stop bool) {
info.StartHeight = 0
app.slashingKeeper.SetValidatorSigningInfo(ctx, addr, info)
return false
})
}