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db.go
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db.go
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package token
import (
"bytes"
"encoding/gob"
"log"
"os"
"path"
"github.com/ethereum/go-ethereum/common"
"github.com/syndtr/goleveldb/leveldb"
)
type TokensDB interface {
AddToken(token *Token) error
GetToken(addr common.Address) (*Token, error)
Close()
}
type tokensDB struct {
db *leveldb.DB
}
func NewTokensDB(dbPath string) TokensDB {
homeDir, err := os.UserHomeDir()
if err != nil {
log.Panic(err)
}
tdbPath := path.Join(homeDir, dbPath)
db, err := leveldb.OpenFile(tdbPath, nil)
if err != nil {
log.Panicf("Failed to open TokensDB: %v", err)
}
return &tokensDB{
db: db,
}
}
func (tdb *tokensDB) Close() {
if err := tdb.db.Close(); err != nil {
log.Printf("Failed to close DB: %v", err)
}
tdb.db = nil
}
type tokenDTO struct {
Symbol string
Decimals uint8
}
func (tdb tokensDB) AddToken(token *Token) error {
if tdb.db == nil {
log.Panicln("Failed to AddToken on closed TokensDB")
}
dto := tokenDTO{
Symbol: token.Symbol,
Decimals: token.Decimals,
}
buf := &bytes.Buffer{}
if err := gob.NewEncoder(buf).Encode(dto); err != nil {
return err
}
return tdb.db.Put(token.Address.Bytes(), buf.Bytes(), nil)
}
func (tdb tokensDB) GetToken(addr common.Address) (*Token, error) {
if tdb.db == nil {
log.Panicln("Failed to GetToken on closed TokensDB")
}
value, err := tdb.db.Get(addr.Bytes(), nil)
if err != nil {
return nil, err
}
buf := bytes.NewBuffer(value)
var dto tokenDTO
if err := gob.NewDecoder(buf).Decode(&dto); err != nil {
return nil, err
}
return &Token{
Address: addr,
Symbol: dto.Symbol,
Decimals: dto.Decimals,
}, nil
}