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advance_time_tx.go
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/
advance_time_tx.go
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// Copyright (C) 2019-2021, Dijets Inc, All rights reserved.
// See the file LICENSE for licensing terms.
package platformvm
import (
"fmt"
"time"
"github.com/lasthyphen/DijetsNetworkBinary/ids"
"github.com/lasthyphen/DijetsNetworkBinary/snow"
"github.com/lasthyphen/DijetsNetworkBinary/vms/components/djtx"
safemath "github.com/lasthyphen/DijetsNetworkBinary/utils/math"
)
var _ UnsignedProposalTx = &UnsignedAdvanceTimeTx{}
// UnsignedAdvanceTimeTx is a transaction to increase the chain's timestamp.
// When the chain's timestamp is updated (a AdvanceTimeTx is accepted and
// followed by a commit block) the staker set is also updated accordingly.
// It must be that:
// * proposed timestamp > [current chain time]
// * proposed timestamp <= [time for next staker set change]
type UnsignedAdvanceTimeTx struct {
djtx.Metadata
// Unix time this block proposes increasing the timestamp to
Time uint64 `serialize:"true" json:"time"`
}
func (tx *UnsignedAdvanceTimeTx) InitCtx(*snow.Context) {}
// Timestamp returns the time this block is proposing the chain should be set to
func (tx *UnsignedAdvanceTimeTx) Timestamp() time.Time {
return time.Unix(int64(tx.Time), 0)
}
func (tx *UnsignedAdvanceTimeTx) InputIDs() ids.Set {
return nil
}
func (tx *UnsignedAdvanceTimeTx) SyntacticVerify(*snow.Context) error {
return nil
}
// Attempts to verify this transaction with the provided state.
func (tx *UnsignedAdvanceTimeTx) SemanticVerify(vm *VM, parentState MutableState, stx *Tx) error {
_, _, err := tx.Execute(vm, parentState, stx)
return err
}
// Execute this transaction.
func (tx *UnsignedAdvanceTimeTx) Execute(
vm *VM,
parentState MutableState,
stx *Tx,
) (
VersionedState,
VersionedState,
error,
) {
switch {
case tx == nil:
return nil, nil, errNilTx
case len(stx.Creds) != 0:
return nil, nil, errWrongNumberOfCredentials
}
txTimestamp := tx.Timestamp()
localTimestamp := vm.clock.Time()
localTimestampPlusSync := localTimestamp.Add(syncBound)
if localTimestampPlusSync.Before(txTimestamp) {
return nil, nil, fmt.Errorf(
"proposed time (%s) is too far in the future relative to local time (%s)",
txTimestamp,
localTimestamp,
)
}
if chainTimestamp := parentState.GetTimestamp(); !txTimestamp.After(chainTimestamp) {
return nil, nil, fmt.Errorf(
"proposed timestamp (%s), not after current timestamp (%s)",
txTimestamp,
chainTimestamp,
)
}
// Only allow timestamp to move forward as far as the time of next staker
// set change time
nextStakerChangeTime, err := getNextStakerChangeTime(parentState)
if err != nil {
return nil, nil, err
}
if txTimestamp.After(nextStakerChangeTime) {
return nil, nil, fmt.Errorf(
"proposed timestamp (%s) later than next staker change time (%s)",
txTimestamp,
nextStakerChangeTime,
)
}
currentSupply := parentState.GetCurrentSupply()
pendingStakers := parentState.PendingStakerChainState()
toAddValidatorsWithRewardToCurrent := []*validatorReward(nil)
toAddDelegatorsWithRewardToCurrent := []*validatorReward(nil)
toAddWithoutRewardToCurrent := []*Tx(nil)
numToRemoveFromPending := 0
// Add to the staker set any pending stakers whose start time is at or
// before the new timestamp. [pendingStakers.Stakers()] is sorted in order
// of increasing startTime
pendingStakerLoop:
for _, tx := range pendingStakers.Stakers() {
switch staker := tx.UnsignedTx.(type) {
case *UnsignedAddDelegatorTx:
if staker.StartTime().After(txTimestamp) {
break pendingStakerLoop
}
r := vm.rewards.Calculate(
staker.Validator.Duration(),
staker.Validator.Wght,
currentSupply,
)
currentSupply, err = safemath.Add64(currentSupply, r)
if err != nil {
return nil, nil, err
}
toAddDelegatorsWithRewardToCurrent = append(toAddDelegatorsWithRewardToCurrent, &validatorReward{
addStakerTx: tx,
potentialReward: r,
})
numToRemoveFromPending++
case *UnsignedAddValidatorTx:
if staker.StartTime().After(txTimestamp) {
break pendingStakerLoop
}
r := vm.rewards.Calculate(
staker.Validator.Duration(),
staker.Validator.Wght,
currentSupply,
)
currentSupply, err = safemath.Add64(currentSupply, r)
if err != nil {
return nil, nil, err
}
toAddValidatorsWithRewardToCurrent = append(toAddValidatorsWithRewardToCurrent, &validatorReward{
addStakerTx: tx,
potentialReward: r,
})
numToRemoveFromPending++
case *UnsignedAddSubnetValidatorTx:
if staker.StartTime().After(txTimestamp) {
break pendingStakerLoop
}
// If this staker should already be removed, then we should just
// never add them.
if staker.EndTime().After(txTimestamp) {
toAddWithoutRewardToCurrent = append(toAddWithoutRewardToCurrent, tx)
}
numToRemoveFromPending++
default:
return nil, nil, fmt.Errorf("expected validator but got %T", tx.UnsignedTx)
}
}
newlyPendingStakers := pendingStakers.DeleteStakers(numToRemoveFromPending)
currentStakers := parentState.CurrentStakerChainState()
numToRemoveFromCurrent := 0
// Remove from the staker set any subnet validators whose endTime is at or
// before the new timestamp
currentStakerLoop:
for _, tx := range currentStakers.Stakers() {
switch staker := tx.UnsignedTx.(type) {
case *UnsignedAddSubnetValidatorTx:
if staker.EndTime().After(txTimestamp) {
break currentStakerLoop
}
numToRemoveFromCurrent++
case *UnsignedAddValidatorTx, *UnsignedAddDelegatorTx:
// We shouldn't be removing any primary network validators here
break currentStakerLoop
default:
return nil, nil, errWrongTxType
}
}
newlyCurrentStakers, err := currentStakers.UpdateStakers(
toAddValidatorsWithRewardToCurrent,
toAddDelegatorsWithRewardToCurrent,
toAddWithoutRewardToCurrent,
numToRemoveFromCurrent,
)
if err != nil {
return nil, nil, err
}
onCommitState := newVersionedState(parentState, newlyCurrentStakers, newlyPendingStakers)
onCommitState.SetTimestamp(txTimestamp)
onCommitState.SetCurrentSupply(currentSupply)
// State doesn't change if this proposal is aborted
onAbortState := newVersionedState(parentState, currentStakers, pendingStakers)
return onCommitState, onAbortState, nil
}
// InitiallyPrefersCommit returns true if the proposed time is at
// or before the current time plus the synchrony bound
func (tx *UnsignedAdvanceTimeTx) InitiallyPrefersCommit(vm *VM) bool {
txTimestamp := tx.Timestamp()
localTimestamp := vm.clock.Time()
localTimestampPlusSync := localTimestamp.Add(syncBound)
return !txTimestamp.After(localTimestampPlusSync)
}
// newAdvanceTimeTx creates a new tx that, if it is accepted and followed by a
// Commit block, will set the chain's timestamp to [timestamp].
func (vm *VM) newAdvanceTimeTx(timestamp time.Time) (*Tx, error) {
tx := &Tx{UnsignedTx: &UnsignedAdvanceTimeTx{
Time: uint64(timestamp.Unix()),
}}
return tx, tx.Sign(Codec, nil)
}