laconicd/app/export.go

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package app
import (
"encoding/json"
"log"
abci "github.com/tendermint/tendermint/abci/types"
tmtypes "github.com/tendermint/tendermint/types"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/slashing"
"github.com/cosmos/cosmos-sdk/x/staking"
"github.com/cosmos/cosmos-sdk/x/staking/exported"
)
// ExportAppStateAndValidators exports the state of the application for a genesis
// file.
func (app *EthermintApp) ExportAppStateAndValidators(
forZeroHeight bool, jailWhiteList []string,
) (appState json.RawMessage, validators []tmtypes.GenesisValidator, err error) {
// Creates context with current height and checks txs for ctx to be usable by start of next block
ctx := app.NewContext(true, abci.Header{Height: app.LastBlockHeight()})
if forZeroHeight {
app.prepForZeroHeightGenesis(ctx, jailWhiteList)
}
// Export genesis to be used by SDK modules
genState := app.mm.ExportGenesis(ctx)
appState, err = codec.MarshalJSONIndent(app.cdc, genState)
if err != nil {
return nil, nil, err
}
// Write validators to staking module to be used by TM node
validators = staking.WriteValidators(ctx, app.StakingKeeper)
return appState, validators, nil
}
// prepare for fresh start at zero height
// NOTE zero height genesis is a temporary feature which will be deprecated
// in favour of export at a block height
func (app *EthermintApp) prepForZeroHeightGenesis(ctx sdk.Context, jailWhiteList []string) {
applyWhiteList := false
//Check if there is a whitelist
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. */
app.CrisisKeeper.AssertInvariants(ctx)
/* Handle fee distribution state. */
// withdraw all validator commission
app.StakingKeeper.IterateValidators(ctx, func(_ int64, val exported.ValidatorI) (stop bool) {
_, _ = app.DistrKeeper.WithdrawValidatorCommission(ctx, val.GetOperator())
return false
})
// withdraw all delegator rewards
dels := app.StakingKeeper.GetAllDelegations(ctx)
for _, delegation := range dels {
_, _ = app.DistrKeeper.WithdrawDelegationRewards(ctx, delegation.DelegatorAddress, delegation.ValidatorAddress)
}
// 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 exported.ValidatorI) (stop bool) {
// donate any unwithdrawn outstanding reward fraction tokens to the community pool
scraps := app.DistrKeeper.GetValidatorOutstandingRewards(ctx, val.GetOperator())
feePool := app.DistrKeeper.GetFeePool(ctx)
feePool.CommunityPool = feePool.CommunityPool.Add(scraps)
app.DistrKeeper.SetFeePool(ctx, feePool)
app.DistrKeeper.Hooks().AfterValidatorCreated(ctx, val.GetOperator())
return false
})
// reinitialize all delegations
for _, del := range dels {
app.DistrKeeper.Hooks().BeforeDelegationCreated(ctx, del.DelegatorAddress, del.ValidatorAddress)
app.DistrKeeper.Hooks().AfterDelegationModified(ctx, del.DelegatorAddress, del.ValidatorAddress)
}
// reset context height
ctx = ctx.WithBlockHeight(height)
/* Handle staking state. */
// iterate through redelegations, reset creation height
app.StakingKeeper.IterateRedelegations(ctx, func(_ int64, red staking.Redelegation) (stop bool) {
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 staking.UnbondingDelegation) (stop bool) {
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[staking.StoreKey])
iter := sdk.KVStoreReversePrefixIterator(store, staking.ValidatorsKey)
counter := int16(0)
for ; iter.Valid(); iter.Next() {
addr := sdk.ValAddress(iter.Key()[1:])
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()
_ = app.StakingKeeper.ApplyAndReturnValidatorSetUpdates(ctx)
/* Handle slashing state. */
// 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
},
)
}