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utxo.go
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utxo.go
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package bdb
import (
"encoding/json"
"sync"
"github.com/btcsuite/btcd/wire"
"github.com/dev-warrior777/go-electrum-client/wallet"
bolt "go.etcd.io/bbolt"
)
type UtxoDB struct {
db *bolt.DB
lock *sync.RWMutex
}
// Put adds a utxo to the database. If the utxo already exists Put updates
// the utxo record.
func (u *UtxoDB) Put(utxo wallet.Utxo) error {
strOutPoint := utxo.Op.String()
urec := &utxoRec{
OutPoint: strOutPoint,
AtHeight: utxo.AtHeight,
Value: utxo.Value,
ScriptPubkey: utxo.ScriptPubkey,
WatchOnly: utxo.WatchOnly,
Frozen: utxo.Frozen,
}
err := u.put(urec)
if err != nil {
return err
}
return nil
}
// Get gets the utxo given an outpoint. Not part of the Utxo interface.
func (u *UtxoDB) Get(op *wire.OutPoint) (wallet.Utxo, error) {
var utxo = wallet.Utxo{}
outPointStr := op.String()
urec, err := u.get(outPointStr)
if err != nil {
return utxo, err
}
outPoint, err := wallet.NewOutPointFromString(urec.OutPoint)
if err != nil {
return utxo, err
}
utxo.Op = *outPoint
utxo.AtHeight = urec.AtHeight
utxo.Value = urec.Value
utxo.ScriptPubkey = urec.ScriptPubkey
utxo.WatchOnly = urec.WatchOnly
utxo.Frozen = urec.Frozen
return utxo, nil
}
// Get gets all the utxos in the utxo bucket in the database.
func (u *UtxoDB) GetAll() ([]wallet.Utxo, error) {
var ret []wallet.Utxo
urecList, err := u.getAll()
if err != nil {
return nil, err
}
for _, urec := range urecList {
outPoint, err := wallet.NewOutPointFromString(urec.OutPoint)
if err != nil {
return nil, err
}
utxo := wallet.Utxo{
Op: *outPoint,
AtHeight: urec.AtHeight,
Value: urec.Value,
ScriptPubkey: urec.ScriptPubkey,
WatchOnly: urec.WatchOnly,
Frozen: urec.Frozen,
}
ret = append(ret, utxo)
}
return ret, nil
}
// SetWatchOnly sets this utxo as watch only. It cannot be unset.
func (u *UtxoDB) SetWatchOnly(utxo wallet.Utxo) error {
strOutPoint := utxo.Op.String()
urec, err := u.get(strOutPoint)
if err != nil {
return err
}
urec.WatchOnly = true
return u.put(urec)
}
// Freeze sets this utxo as frozen. It cannot be used in a transaction.
func (u *UtxoDB) Freeze(utxo wallet.Utxo) error {
strOutPoint := utxo.Op.String()
urec, err := u.get(strOutPoint)
if err != nil {
return err
}
urec.Frozen = true
return u.put(urec)
}
// UnFreeze resets this utxo as unfrozen. It can again be used in a transaction.
func (u *UtxoDB) UnFreeze(utxo wallet.Utxo) error {
strOutPoint := utxo.Op.String()
urec, err := u.get(strOutPoint)
if err != nil {
return err
}
urec.Frozen = false
return u.put(urec)
}
// Delete deletes a utxo from the database.
func (u *UtxoDB) Delete(utxo wallet.Utxo) error {
strOutPoint := utxo.Op.String()
return u.delete(strOutPoint)
}
// DB access record
type utxoRec struct {
// Unique key - Used as K & V[OutPoint]
OutPoint string `json:"outpoint"`
AtHeight int64 `json:"height"`
Value int64 `json:"value"`
ScriptPubkey []byte `json:"pkscript"`
WatchOnly bool `json:"watch_only"`
Frozen bool `json:"frozen"`
}
func (u *UtxoDB) put(urec *utxoRec) error {
u.lock.Lock()
defer u.lock.Unlock()
key := []byte(urec.OutPoint)
value, err := json.Marshal(urec)
if err != nil {
return err
}
e := u.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(utxosBkt)
if b == nil {
return ErrBucketNotFound
}
err := b.Put(key, value)
return err
})
return e
}
func (u *UtxoDB) get(outPoint string) (*utxoRec, error) {
u.lock.RLock()
defer u.lock.RUnlock()
key := []byte(outPoint)
var urec utxoRec
e := u.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(utxosBkt)
if b == nil {
return ErrBucketNotFound
}
value := b.Get(key)
err := json.Unmarshal(value, &urec)
return err
})
return &urec, e
}
func (u *UtxoDB) getAll() ([]utxoRec, error) {
u.lock.RLock()
defer u.lock.RUnlock()
var urecList []utxoRec
e := u.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket(utxosBkt)
if b == nil {
return ErrBucketNotFound
}
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
var urec utxoRec
err := json.Unmarshal(v, &urec)
if err != nil {
return err
}
urecList = append(urecList, urec)
}
return nil
})
return urecList, e
}
func (u *UtxoDB) delete(outPoint string) error {
u.lock.Lock()
defer u.lock.Unlock()
key := []byte(outPoint)
e := u.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(utxosBkt)
if b == nil {
return ErrBucketNotFound
}
err := b.Delete(key)
return err
})
return e
}