0g-chain/app/export.go

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package app
import (
"encoding/json"
"log"
tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
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servertypes "github.com/cosmos/cosmos-sdk/server/types"
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sdk "github.com/cosmos/cosmos-sdk/types"
slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
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"github.com/cosmos/cosmos-sdk/x/staking"
stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
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)
// ExportAppStateAndValidators export the state of the app for a genesis file
func (app *App) ExportAppStateAndValidators(forZeroHeight bool, jailWhiteList []string,
) (servertypes.ExportedApp, error) {
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// as if they could withdraw from the start of the next block
// block time is not available and defaults to Jan 1st, 0001
ctx := app.NewContext(true, tmproto.Header{Height: app.LastBlockHeight()})
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height := app.LastBlockHeight() + 1
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if forZeroHeight {
height = 0
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app.prepForZeroHeightGenesis(ctx, jailWhiteList)
}
genState := app.mm.ExportGenesis(ctx, app.appCodec)
newAppState, err := json.MarshalIndent(genState, "", " ")
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if err != nil {
return servertypes.ExportedApp{}, err
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}
validators, err := staking.WriteValidators(ctx, app.stakingKeeper)
return servertypes.ExportedApp{
AppState: newAppState,
Validators: validators,
Height: height,
ConsensusParams: app.BaseApp.GetConsensusParams(ctx),
}, err
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}
// prepare for fresh start at zero height
// NOTE zero height genesis is a temporary feature which will be deprecated
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// in favour of export at a block height
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func (app *App) prepForZeroHeightGenesis(ctx sdk.Context, jailWhiteList []string) {
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applyWhiteList := false
// Check if there is a whitelist
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if len(jailWhiteList) > 0 {
applyWhiteList = true
}
whiteListMap := make(map[string]bool)
for _, addr := range jailWhiteList {
_, err := sdk.ValAddressFromBech32(addr)
if err != nil {
log.Fatal(err)
}
whiteListMap[addr] = true
}
/* Just to be safe, assert the invariants on current state. */
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app.crisisKeeper.AssertInvariants(ctx)
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/* Handle fee distribution state. */
// withdraw all validator commission
app.stakingKeeper.IterateValidators(ctx, func(_ int64, val stakingtypes.ValidatorI) (stop bool) {
_, _ = app.distrKeeper.WithdrawValidatorCommission(ctx, val.GetOperator())
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return false
})
// withdraw all delegator rewards
dels := app.stakingKeeper.GetAllDelegations(ctx)
for _, delegation := range dels {
valAddr, err := sdk.ValAddressFromBech32(delegation.ValidatorAddress)
if err != nil {
panic(err)
}
delAddr, err := sdk.AccAddressFromBech32(delegation.DelegatorAddress)
if err != nil {
panic(err)
}
_, _ = app.distrKeeper.WithdrawDelegationRewards(ctx, delAddr, valAddr)
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}
// clear validator slash events
app.distrKeeper.DeleteAllValidatorSlashEvents(ctx)
// clear validator historical rewards
app.distrKeeper.DeleteAllValidatorHistoricalRewards(ctx)
// set context height to zero
height := ctx.BlockHeight()
ctx = ctx.WithBlockHeight(0)
// reinitialize all validators
app.stakingKeeper.IterateValidators(ctx, func(_ int64, val stakingtypes.ValidatorI) (stop bool) {
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// donate any unwithdrawn outstanding reward fraction tokens to the community pool
scraps := app.distrKeeper.GetValidatorOutstandingRewardsCoins(ctx, val.GetOperator())
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feePool := app.distrKeeper.GetFeePool(ctx)
feePool.CommunityPool = feePool.CommunityPool.Add(scraps...)
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app.distrKeeper.SetFeePool(ctx, feePool)
app.distrKeeper.Hooks().AfterValidatorCreated(ctx, val.GetOperator())
return false
})
// reinitialize all delegations
for _, del := range dels {
valAddr, err := sdk.ValAddressFromBech32(del.ValidatorAddress)
if err != nil {
panic(err)
}
delAddr, err := sdk.AccAddressFromBech32(del.DelegatorAddress)
if err != nil {
panic(err)
}
app.distrKeeper.Hooks().BeforeDelegationCreated(ctx, delAddr, valAddr)
app.distrKeeper.Hooks().AfterDelegationModified(ctx, delAddr, valAddr)
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}
// reset context height
ctx = ctx.WithBlockHeight(height)
/* Handle staking state. */
// iterate through redelegations, reset creation height
app.stakingKeeper.IterateRedelegations(ctx, func(_ int64, red stakingtypes.Redelegation) (stop bool) {
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for i := range red.Entries {
red.Entries[i].CreationHeight = 0
}
app.stakingKeeper.SetRedelegation(ctx, red)
return false
})
// iterate through unbonding delegations, reset creation height
app.stakingKeeper.IterateUnbondingDelegations(ctx, func(_ int64, ubd stakingtypes.UnbondingDelegation) (stop bool) {
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for i := range ubd.Entries {
ubd.Entries[i].CreationHeight = 0
}
app.stakingKeeper.SetUnbondingDelegation(ctx, ubd)
return false
})
// Iterate through validators by power descending, reset bond heights, and
// update bond intra-tx counters.
store := ctx.KVStore(app.keys[stakingtypes.StoreKey])
iter := sdk.KVStoreReversePrefixIterator(store, stakingtypes.ValidatorsKey)
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counter := int16(0)
for ; iter.Valid(); iter.Next() {
addr := sdk.ValAddress(stakingtypes.AddressFromValidatorsKey(iter.Key()))
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validator, found := app.stakingKeeper.GetValidator(ctx, addr)
if !found {
panic("expected validator, not found")
}
validator.UnbondingHeight = 0
if applyWhiteList && !whiteListMap[addr.String()] {
validator.Jailed = true
}
app.stakingKeeper.SetValidator(ctx, validator)
counter++
}
iter.Close()
_, err := app.stakingKeeper.ApplyAndReturnValidatorSetUpdates(ctx)
if err != nil {
log.Fatal(err)
}
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/* Handle slashing state. */
// reset start height on signing infos
app.slashingKeeper.IterateValidatorSigningInfos(
ctx,
func(addr sdk.ConsAddress, info slashingtypes.ValidatorSigningInfo) (stop bool) {
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info.StartHeight = 0
app.slashingKeeper.SetValidatorSigningInfo(ctx, addr, info)
return false
},
)
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}