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state.go
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state.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package avm
import (
"github.com/prometheus/client_golang/prometheus"
"github.com/ava-labs/avalanchego/cache"
"github.com/ava-labs/avalanchego/codec"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/database/prefixdb"
"github.com/ava-labs/avalanchego/vms/components/avax"
)
const (
txDeduplicatorSize = 8192
)
var (
utxoStatePrefix = []byte("utxo")
statusStatePrefix = []byte("status")
singletonStatePrefix = []byte("singleton")
txStatePrefix = []byte("tx")
_ State = &state{}
)
// State persistently maintains a set of UTXOs, transaction, statuses, and
// singletons.
type State interface {
avax.UTXOState
avax.StatusState
avax.SingletonState
TxState
DeduplicateTx(tx *UniqueTx) *UniqueTx
}
type state struct {
avax.UTXOState
avax.StatusState
avax.SingletonState
TxState
uniqueTxs cache.Deduplicator
}
type StateConfig struct {
DB database.Database
GenesisCodec, Codec codec.Manager
Metrics prometheus.Registerer
}
func NewState(config StateConfig) (State, error) {
utxoDB := prefixdb.New(utxoStatePrefix, config.DB)
statusDB := prefixdb.New(statusStatePrefix, config.DB)
singletonDB := prefixdb.New(singletonStatePrefix, config.DB)
txDB := prefixdb.New(txStatePrefix, config.DB)
utxoState, err := avax.NewMeteredUTXOState(utxoDB, config.Codec, config.Metrics)
if err != nil {
return nil, err
}
statusState, err := avax.NewMeteredStatusState(statusDB, config.Metrics)
if err != nil {
return nil, err
}
txState, err := NewMeteredTxState(txDB, config.GenesisCodec, config.Metrics)
return &state{
UTXOState: utxoState,
StatusState: statusState,
SingletonState: avax.NewSingletonState(singletonDB),
TxState: txState,
uniqueTxs: &cache.EvictableLRU{
Size: txDeduplicatorSize,
},
}, err
}
// UniqueTx de-duplicates the transaction.
func (s *state) DeduplicateTx(tx *UniqueTx) *UniqueTx {
return s.uniqueTxs.Deduplicate(tx).(*UniqueTx)
}