Overhaul [1/n]

Signed-off-by: Sean Du <do4suki@gmail.com>

pkg/db/db.go

@@ -2,30 +2,22 @@ package db
 
 import (
 	"fmt"
-	"honoka-chan/pkg/utils"
-	"os"
 
 	_ "modernc.org/sqlite"
 	"xorm.io/xorm"
 )
 
 var (
-	DB *Instance
+	Ldb *LdbInstance
 
-	ExampleDb = "assets/data.example.db"
-	MainDb    = "assets/main.db"
-	UserDb    = "assets/data.db"
-	MainEng   *xorm.Engine
-	UserEng   *xorm.Engine
+	MainDb  = "assets/main.db"
+	UserDb  = "assets/data.db"
+	MainEng *xorm.Engine
+	UserEng *xorm.Engine
 )
 
 func init() {
-	DB = GetInstance()
-
-	_, err := os.Stat(UserDb)
-	if err != nil {
-		utils.WriteAllText(UserDb, utils.ReadAllText(ExampleDb))
-	}
+	Ldb = GetLdbInstance()
 
 	eng, err := xorm.NewEngine("sqlite", MainDb)
 	if err != nil {
@@ -53,7 +45,7 @@ func init() {
 }
 
 func MatchTokenUid(token, uid string) bool {
-	res, err := DB.Get([]byte(uid))
+	res, err := Ldb.Get([]byte(uid))
 	if err != nil {
 		fmt.Println(err)
 		return false

pkg/db/leveldb.go

@@ -11,13 +11,13 @@ var (
 	once sync.Once
 )
 
-type Instance struct {
+type LdbInstance struct {
 	db *leveldb.DB
 	mu sync.Mutex
 }
 
-func GetInstance() *Instance {
-	in := Instance{}
+func GetLdbInstance() *LdbInstance {
+	in := LdbInstance{}
 	once.Do(func() {
 		var err error
 		in.db, err = leveldb.OpenFile("./data/honoka-chan.db", nil)
@@ -28,7 +28,7 @@ func GetInstance() *Instance {
 	return &in
 }
 
-func (in *Instance) Close() error {
+func (in *LdbInstance) Close() error {
 	in.mu.Lock()
 	defer in.mu.Unlock()
 	if in.db != nil {
@@ -37,7 +37,7 @@ func (in *Instance) Close() error {
 	return nil
 }
 
-func (in *Instance) Get(key []byte) ([]byte, error) {
+func (in *LdbInstance) Get(key []byte) ([]byte, error) {
 	if len(key) == 0 {
 		return nil, errors.New("empty key")
 	}
@@ -50,7 +50,7 @@ func (in *Instance) Get(key []byte) ([]byte, error) {
 	return res, nil
 }
 
-func (in *Instance) Set(key, value []byte) error {
+func (in *LdbInstance) Set(key, value []byte) error {
 	if len(key) == 0 {
 		return errors.New("empty key")
 	}