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diff.go
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diff.go
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// Copyright (C) 2019-2024, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package state
import (
"errors"
"fmt"
"time"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/vms/avm/block"
"github.com/ava-labs/avalanchego/vms/avm/txs"
"github.com/ava-labs/avalanchego/vms/components/avax"
)
var (
_ Diff = (*diff)(nil)
_ Versions = stateGetter{}
ErrMissingParentState = errors.New("missing parent state")
)
type Diff interface {
Chain
Apply(Chain)
}
type diff struct {
parentID ids.ID
stateVersions Versions
// map of modified UTXOID -> *UTXO if the UTXO is nil, it has been removed
modifiedUTXOs map[ids.ID]*avax.UTXO
addedTxs map[ids.ID]*txs.Tx // map of txID -> tx
addedBlockIDs map[uint64]ids.ID // map of height -> blockID
addedBlocks map[ids.ID]block.Block // map of blockID -> block
lastAccepted ids.ID
timestamp time.Time
}
func NewDiff(
parentID ids.ID,
stateVersions Versions,
) (Diff, error) {
parentState, ok := stateVersions.GetState(parentID)
if !ok {
return nil, fmt.Errorf("%w: %s", ErrMissingParentState, parentID)
}
return &diff{
parentID: parentID,
stateVersions: stateVersions,
modifiedUTXOs: make(map[ids.ID]*avax.UTXO),
addedTxs: make(map[ids.ID]*txs.Tx),
addedBlockIDs: make(map[uint64]ids.ID),
addedBlocks: make(map[ids.ID]block.Block),
lastAccepted: parentState.GetLastAccepted(),
timestamp: parentState.GetTimestamp(),
}, nil
}
type stateGetter struct {
state Chain
}
func (s stateGetter) GetState(ids.ID) (Chain, bool) {
return s.state, true
}
func NewDiffOn(parentState Chain) (Diff, error) {
return NewDiff(ids.Empty, stateGetter{
state: parentState,
})
}
func (d *diff) GetUTXO(utxoID ids.ID) (*avax.UTXO, error) {
if utxo, modified := d.modifiedUTXOs[utxoID]; modified {
if utxo == nil {
return nil, database.ErrNotFound
}
return utxo, nil
}
parentState, ok := d.stateVersions.GetState(d.parentID)
if !ok {
return nil, fmt.Errorf("%w: %s", ErrMissingParentState, d.parentID)
}
return parentState.GetUTXO(utxoID)
}
func (d *diff) AddUTXO(utxo *avax.UTXO) {
d.modifiedUTXOs[utxo.InputID()] = utxo
}
func (d *diff) DeleteUTXO(utxoID ids.ID) {
d.modifiedUTXOs[utxoID] = nil
}
func (d *diff) GetTx(txID ids.ID) (*txs.Tx, error) {
if tx, exists := d.addedTxs[txID]; exists {
return tx, nil
}
parentState, ok := d.stateVersions.GetState(d.parentID)
if !ok {
return nil, fmt.Errorf("%w: %s", ErrMissingParentState, d.parentID)
}
return parentState.GetTx(txID)
}
func (d *diff) AddTx(tx *txs.Tx) {
d.addedTxs[tx.ID()] = tx
}
func (d *diff) GetBlockIDAtHeight(height uint64) (ids.ID, error) {
if blkID, exists := d.addedBlockIDs[height]; exists {
return blkID, nil
}
parentState, ok := d.stateVersions.GetState(d.parentID)
if !ok {
return ids.Empty, fmt.Errorf("%w: %s", ErrMissingParentState, d.parentID)
}
return parentState.GetBlockIDAtHeight(height)
}
func (d *diff) GetBlock(blkID ids.ID) (block.Block, error) {
if blk, exists := d.addedBlocks[blkID]; exists {
return blk, nil
}
parentState, ok := d.stateVersions.GetState(d.parentID)
if !ok {
return nil, fmt.Errorf("%w: %s", ErrMissingParentState, d.parentID)
}
return parentState.GetBlock(blkID)
}
func (d *diff) AddBlock(blk block.Block) {
blkID := blk.ID()
d.addedBlockIDs[blk.Height()] = blkID
d.addedBlocks[blkID] = blk
}
func (d *diff) GetLastAccepted() ids.ID {
return d.lastAccepted
}
func (d *diff) SetLastAccepted(lastAccepted ids.ID) {
d.lastAccepted = lastAccepted
}
func (d *diff) GetTimestamp() time.Time {
return d.timestamp
}
func (d *diff) SetTimestamp(t time.Time) {
d.timestamp = t
}
func (d *diff) Apply(state Chain) {
for utxoID, utxo := range d.modifiedUTXOs {
if utxo != nil {
state.AddUTXO(utxo)
} else {
state.DeleteUTXO(utxoID)
}
}
for _, tx := range d.addedTxs {
state.AddTx(tx)
}
for _, blk := range d.addedBlocks {
state.AddBlock(blk)
}
state.SetLastAccepted(d.lastAccepted)
state.SetTimestamp(d.timestamp)
}