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sqlite.go
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sqlite.go
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package xstorage
import (
"context"
"errors"
"fmt"
"strconv"
"strings"
"sync"
"time"
"github.com/intmian/mian_go_lib/tool/misc"
_ "github.com/mattn/go-sqlite3"
"gorm.io/driver/sqlite"
"gorm.io/gorm"
"gorm.io/gorm/logger"
)
/*
初始化时传入数据库地址和表名
列Key用来存储键
列ValueInt用来存储整数值
列ValueString用来存储字符串值
...
请注意假如value类型为slice,会被存储于key[0]、Key[1]、Key[2]...列中,Key[0]、Key[1]、Key[2]...列的值为value的每个元素
*/
type SqliteCore struct {
db *gorm.DB
misc.InitTag
rwLock sync.RWMutex
}
type EmptyLogger struct {
}
func (e EmptyLogger) LogMode(level logger.LogLevel) logger.Interface {
return e
}
func (e EmptyLogger) Info(ctx context.Context, s string, i ...interface{}) {}
func (e EmptyLogger) Warn(ctx context.Context, s string, i ...interface{}) {}
func (e EmptyLogger) Error(ctx context.Context, s string, i ...interface{}) {}
func (e EmptyLogger) Trace(ctx context.Context, begin time.Time, fc func() (sql string, rowsAffected int64), err error) {
}
func NewSqliteCore(DbFileAddr string) (*SqliteCore, error) {
// 依靠外层进行日志交互,为了避免本地打印日志过多,这里不使用日志库
db, err := gorm.Open(sqlite.Open(DbFileAddr), &gorm.Config{
Logger: EmptyLogger{},
})
if err != nil {
return nil, errors.Join(ErrOpenSqlite, err)
}
err = db.AutoMigrate(&KeyValueModel{})
if err != nil {
return nil, errors.Join(ErrAutoMigrate, err)
}
sqliteCore := &SqliteCore{
db: db,
}
sqliteCore.SetInitialized()
return sqliteCore, nil
}
func (m *SqliteCore) Get(key string, rec *ValueUnit) (bool, error) {
if rec == nil {
return false, ErrRecIsNil
}
return m.getInner(key, rec, true)
}
func (m *SqliteCore) getInner(key string, rec *ValueUnit, needLock bool) (exist bool, retErr error) {
if !m.IsInitialized() {
return false, ErrSqliteCoreNotInit
}
if needLock {
m.rwLock.RLock()
defer m.rwLock.RUnlock()
}
var keyValueModel KeyValueModel
result := m.db.Where("Key = ?", key).First(&keyValueModel)
// 如果没有这个
if result.Error != nil {
if errors.Is(result.Error, gorm.ErrRecordNotFound) {
return false, nil
} else {
return false, errors.Join(ErrSqliteDBFileAddrNotExist, result.Error)
}
}
sliceNum, err := sqliteModel2Data(keyValueModel, rec)
if err != nil {
return false, err
}
if sliceNum == 0 {
return true, nil
}
// slice 的内容存放在 Key[0]、Key[1]、Key[2]...Key[sliceNum-1] 列中
switch ValueType(keyValueModel.ValueType) {
case ValueTypeSliceInt:
rec.Data = make([]int, sliceNum)
rec.Type = ValueTypeSliceInt
for i := 0; i < sliceNum; i++ {
var keyValueModel2 KeyValueModel
result := m.db.Where("Key = ?", key+"["+strconv.Itoa(i)+"]").First(&keyValueModel2)
if result.Error != nil {
return false, errors.Join(ErrSqliteDBFileAddrNotExist, result.Error)
}
if keyValueModel2.ValueInt == nil {
return false, fmt.Errorf("slice but ValueInt is nil, Key: %s[%d]", key, i)
}
rec.Data.([]int)[i] = *keyValueModel2.ValueInt
}
case ValueTypeSliceString:
rec.Data = make([]string, sliceNum)
rec.Type = ValueTypeSliceString
for i := 0; i < sliceNum; i++ {
var keyValueModel2 KeyValueModel
result := m.db.Where("Key = ?", key+"["+strconv.Itoa(i)+"]").First(&keyValueModel2)
if result.Error != nil {
return false, errors.Join(ErrSqliteDBFileAddrNotExist, result.Error)
}
if keyValueModel2.ValueString == nil {
return false, fmt.Errorf("slice but ValueString is nil, Key: %s[%d]", key, i)
}
rec.Data.([]string)[i] = *keyValueModel2.ValueString
}
case ValueTypeSliceFloat:
rec.Data = make([]float32, sliceNum)
rec.Type = ValueTypeSliceFloat
for i := 0; i < sliceNum; i++ {
var keyValueModel2 KeyValueModel
result := m.db.Where("Key = ?", key+"["+strconv.Itoa(i)+"]").First(&keyValueModel2)
if result.Error != nil {
return false, errors.Join(ErrSqliteDBFileAddrNotExist, result.Error)
}
if keyValueModel2.ValueFloat == nil {
return false, fmt.Errorf("slice but ValueFloat is nil, Key: %s[%d]", key, i)
}
rec.Data.([]float32)[i] = *keyValueModel2.ValueFloat
}
case ValueTypeSliceBool:
rec.Data = make([]bool, sliceNum)
rec.Type = ValueTypeSliceBool
for i := 0; i < sliceNum; i++ {
var keyValueModel2 KeyValueModel
result := m.db.Where("Key = ?", key+"["+strconv.Itoa(i)+"]").First(&keyValueModel2)
if result.Error != nil {
return false, errors.Join(ErrSqliteDBFileAddrNotExist, result.Error)
}
if keyValueModel2.ValueInt == nil {
return false, fmt.Errorf("slice but ValueInt is nil, Key: %s[%d]", key, i)
}
if *keyValueModel2.ValueInt == 0 {
rec.Data.([]bool)[i] = false
} else {
rec.Data.([]bool)[i] = true
}
}
default:
return false, ErrValueType
}
return true, nil
}
// sqliteModel2Data 将从数据库取出来的model转化为ValueUnit,但是需要注意的是,如果是slice类型,只返回slice的长度,不返回具体的值
func sqliteModel2Data(keyValueModel KeyValueModel, rec *ValueUnit) (int, error) {
value := &ValueUnit{}
sliceNum := 0
// 判断合法性
switch ValueType(keyValueModel.ValueType) {
case ValueTypeInt, ValueTypeBool:
if keyValueModel.ValueInt == nil {
return 0, ErrValueIsNil
}
case ValueTypeString:
if keyValueModel.ValueString == nil {
return 0, ErrValueIsNil
}
case ValueTypeFloat:
if keyValueModel.ValueFloat == nil {
return 0, ErrValueIsNil
}
case ValueTypeSliceInt, ValueTypeSliceString, ValueTypeSliceFloat, ValueTypeSliceBool:
if keyValueModel.ValueInt == nil {
return 0, ErrSliceButValueIntIsNil
}
default:
return 0, ErrValueType
}
// 读取值
switch ValueType(keyValueModel.ValueType) {
case ValueTypeInt:
value.Data = *keyValueModel.ValueInt
value.Type = ValueTypeInt
case ValueTypeBool:
if (*keyValueModel.ValueInt) == 0 {
value.Data = false
} else {
value.Data = true
}
value.Type = ValueTypeBool
case ValueTypeString:
value.Data = *keyValueModel.ValueString
value.Type = ValueTypeString
case ValueTypeFloat:
value.Data = *keyValueModel.ValueFloat
value.Type = ValueTypeFloat
case ValueTypeSliceInt, ValueTypeSliceString, ValueTypeSliceFloat, ValueTypeSliceBool:
sliceNum = *keyValueModel.ValueInt
if sliceNum <= 0 {
return 0, fmt.Errorf("slice but sliceNum is %d", sliceNum)
}
default:
return 0, ErrValueType
}
*rec = *value
return sliceNum, nil
}
func (m *SqliteCore) Set(key string, value *ValueUnit) error {
if !m.IsInitialized() {
return ErrSqliteCoreNotInit
}
// 为避免GetAll时,取出slice的成员作为单独的主键,这里不允许key中包含[]
if strings.Contains(key, "[") || strings.Contains(key, "]") {
return ErrKeyCanNotContainSquareBrackets
}
var needCreate []*KeyValueModel
var needSet []*KeyValueModel
var needRemove []*KeyValueModel // slice缩短的情况
keyValueModels, err := sqliteData2Model(key, value)
if err != nil {
return errors.Join(ErrSqliteData2Model, err)
}
dbValue := &ValueUnit{}
exist, err := m.getInner(key, dbValue, false)
if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
return errors.Join(ErrSqliteDBFileAddrNotExist, err)
}
if dbValue.Type != 0 && dbValue.Type != value.Type {
return ErrValueTypeNotMatch
}
notList := dbValue.Type < ValueTypeSliceBegin
if notList {
if !exist {
needCreate = keyValueModels
}
if exist {
if !Compare(dbValue, value) {
needSet = keyValueModels
}
}
} else {
sliceNum := 0
switch dbValue.Type {
case ValueTypeSliceInt:
sliceNum = len(ToBase[[]int](dbValue))
case ValueTypeSliceString:
sliceNum = len(ToBase[[]string](dbValue))
case ValueTypeSliceFloat:
sliceNum = len(ToBase[[]float32](dbValue))
case ValueTypeSliceBool:
sliceNum = len(ToBase[[]bool](dbValue))
}
for i, keyValueModel := range keyValueModels {
if i == 0 {
// 长度节点
if *keyValueModel.ValueInt != sliceNum {
needSet = append(needSet, keyValueModel)
}
continue
}
if i > sliceNum {
needCreate = append(needCreate, keyValueModel)
continue
}
// 判断值
switch ValueType(keyValueModel.ValueType) {
case ValueTypeInt:
if *keyValueModel.ValueInt != ToBase[[]int](dbValue)[i-1] {
needSet = append(needSet, keyValueModel)
}
case ValueTypeBool:
b := false
if *keyValueModel.ValueInt != 0 {
b = true
}
if b != ToBase[[]bool](dbValue)[i-1] {
needSet = append(needSet, keyValueModel)
}
case ValueTypeString:
if *keyValueModel.ValueString != ToBase[[]string](dbValue)[i-1] {
needSet = append(needSet, keyValueModel)
}
case ValueTypeFloat:
if *keyValueModel.ValueFloat != ToBase[[]float32](dbValue)[i-1] {
needSet = append(needSet, keyValueModel)
}
}
}
for i := len(keyValueModels) - 1; i < sliceNum; i++ {
needRemove = append(needRemove, &KeyValueModel{
Key: key + "[" + strconv.Itoa(i) + "]",
})
}
}
m.rwLock.Lock()
defer m.rwLock.Unlock()
for _, keyValueModel := range needCreate {
result := m.db.Create(keyValueModel)
if result.Error != nil {
return errors.Join(ErrCreateValue, result.Error)
}
}
for _, keyValueModel := range needSet {
result := m.db.Where("Key = ?", keyValueModel.Key).Updates(keyValueModel)
if result.Error != nil {
return errors.Join(ErrSetValue, result.Error)
}
}
for _, keyValueModel := range needRemove {
result := m.db.Where("Key = ?", keyValueModel.Key).Delete(&KeyValueModel{})
if result.Error != nil {
return errors.Join(ErrRemoveValue, result.Error)
}
}
return nil
}
// 将数据转换为model,如果是slice类型,会返回多个model
func sqliteData2Model(key string, value *ValueUnit) ([]*KeyValueModel, error) {
keyValueModel := &KeyValueModel{
Key: key,
ValueType: int(value.Type),
}
switch value.Type {
case ValueTypeInt:
valueInt := ToBase[int](value)
keyValueModel.ValueInt = &valueInt
case ValueTypeBool:
valueBool := ToBase[bool](value)
if valueBool {
valueInt := 1
keyValueModel.ValueInt = &valueInt
} else {
valueInt := 0
keyValueModel.ValueInt = &valueInt
}
case ValueTypeString:
valueString := ToBase[string](value)
keyValueModel.ValueString = &valueString
case ValueTypeFloat:
valueFloat := ToBase[float32](value)
keyValueModel.ValueFloat = &valueFloat
case ValueTypeSliceInt:
sliceNum := len(value.Data.([]int))
if sliceNum <= 0 {
return nil, fmt.Errorf("slice but sliceNum is %d", sliceNum)
}
valueInt := sliceNum
keyValueModel.ValueInt = &valueInt
case ValueTypeSliceString:
sliceNum := len(value.Data.([]string))
if sliceNum <= 0 {
return nil, fmt.Errorf("slice but sliceNum is %d", sliceNum)
}
valueInt := sliceNum
keyValueModel.ValueInt = &valueInt
case ValueTypeSliceFloat:
sliceNum := len(value.Data.([]float32))
if sliceNum <= 0 {
return nil, fmt.Errorf("slice but sliceNum is %d", sliceNum)
}
valueInt := sliceNum
keyValueModel.ValueInt = &valueInt
case ValueTypeSliceBool:
sliceNum := len(value.Data.([]bool))
if sliceNum <= 0 {
return nil, fmt.Errorf("slice but sliceNum is %d", sliceNum)
}
valueInt := sliceNum
keyValueModel.ValueInt = &valueInt
}
result := make([]*KeyValueModel, 1)
result[0] = keyValueModel
switch value.Type {
case ValueTypeSliceInt:
//for i, v := range ToBase[[]int](value) {
// Errslice = m.Set(Key+"["+strconv.Itoa(i)+"]", &ValueUnit{
// Type: ValueTypeInt,
// Data: v,
// })
//}
for i, v := range ToBase[[]int](value) {
newV := v
result = append(result, &KeyValueModel{
Key: key + "[" + strconv.Itoa(i) + "]",
ValueType: int(ValueTypeInt),
ValueInt: &newV,
})
}
case ValueTypeSliceString:
for i, v := range ToBase[[]string](value) {
newV := v
result = append(result, &KeyValueModel{
Key: key + "[" + strconv.Itoa(i) + "]",
ValueType: int(ValueTypeString),
ValueString: &newV,
})
}
case ValueTypeSliceFloat:
for i, v := range ToBase[[]float32](value) {
newV := v
result = append(result, &KeyValueModel{
Key: key + "[" + strconv.Itoa(i) + "]",
ValueType: int(ValueTypeFloat),
ValueFloat: &newV,
})
}
case ValueTypeSliceBool:
for i, v := range ToBase[[]bool](value) {
ti := 0
if v {
ti = 1
}
result = append(result, &KeyValueModel{
Key: key + "[" + strconv.Itoa(i) + "]",
ValueType: int(ValueTypeBool),
ValueInt: &ti,
})
}
}
return result, nil
}
func (m *SqliteCore) Delete(key string) error {
if !m.IsInitialized() {
return ErrSqliteCoreNotInit
}
m.rwLock.Lock()
defer m.rwLock.Unlock()
return m.db.Where("Key = ?", key).Delete(&KeyValueModel{}).Error
}
func (m *SqliteCore) Have(key string) (bool, error) {
if !m.IsInitialized() {
return false, ErrSqliteCoreNotInit
}
m.rwLock.RLock()
defer m.rwLock.RUnlock()
var keyValueModel KeyValueModel
result := m.db.Where("Key = ?", key).First(&keyValueModel)
if result.Error != nil {
return false, errors.Join(ErrSqliteDBFileAddrNotExist, result.Error)
}
return true, nil
}
func (m *SqliteCore) GetAll() (map[string]*ValueUnit, error) {
if !m.IsInitialized() {
return nil, ErrSqliteCoreNotInit
}
m.rwLock.RLock()
defer m.rwLock.RUnlock()
var keyValueModelList []KeyValueModel
result := m.db.Find(&keyValueModelList)
if result.Error != nil {
return nil, errors.Join(ErrGetAllValue, result.Error)
}
keyValueModelMap := make(map[string]*ValueUnit)
for _, keyValueModel := range keyValueModelList {
// 跳过所有含有[]的key,因为这些key是slice的成员,不是真正的key
if strings.Contains(keyValueModel.Key, "[") || strings.Contains(keyValueModel.Key, "]") {
continue
}
unit := &ValueUnit{}
sliceNum, err := sqliteModel2Data(keyValueModel, unit)
if err != nil {
return nil, errors.Join(ErrsqliteModel2Data, err)
}
if sliceNum != 0 {
// slice 的内容存放在 Key[0]、Key[1]、Key[2]...Key[sliceNum-1] 列中
_, err = m.Get(keyValueModel.Key, unit)
if err != nil {
return nil, errors.Join(ErrGetSliceValue, err)
}
}
keyValueModelMap[keyValueModel.Key] = unit
}
return keyValueModelMap, nil
}