128 lines
3.0 KiB
Go
128 lines
3.0 KiB
Go
package db
|
|
|
|
import (
|
|
"context"
|
|
"git.nobla.cn/golang/moto/config"
|
|
"git.nobla.cn/golang/rest/types"
|
|
"github.com/go-sql-driver/mysql"
|
|
lru "github.com/hashicorp/golang-lru/v2"
|
|
mysqlDriver "gorm.io/driver/mysql"
|
|
"gorm.io/gorm"
|
|
"reflect"
|
|
"time"
|
|
)
|
|
|
|
var (
|
|
db *gorm.DB
|
|
)
|
|
|
|
var (
|
|
cacheInstance, _ = lru.New[string, *cacheEntry](64)
|
|
)
|
|
|
|
func WithDepend(s string, args ...any) CacheOption {
|
|
return func(o *CacheOptions) {
|
|
o.dependSQL = s
|
|
o.dependArgs = args
|
|
}
|
|
}
|
|
|
|
func TryCache(ctx context.Context, key string, f CachingFunc, cbs ...CacheOption) (value any, err error) {
|
|
var (
|
|
ok bool
|
|
hasDependValue bool
|
|
dependValue any
|
|
)
|
|
opts := &CacheOptions{}
|
|
for _, cb := range cbs {
|
|
cb(opts)
|
|
}
|
|
//从缓存加载数据
|
|
if value, ok = cacheInstance.Get(key); ok {
|
|
entry := value.(*cacheEntry)
|
|
if opts.dependSQL == "" {
|
|
return entry.storeValue, nil
|
|
}
|
|
//如果频繁访问，不检查依赖
|
|
if time.Since(entry.lastChecked) < time.Millisecond*500 {
|
|
return entry.storeValue, nil
|
|
}
|
|
//对比依赖值
|
|
if err = WithContext(ctx).Raw(opts.dependSQL, opts.dependArgs...).Scan(&dependValue).Error; err == nil {
|
|
hasDependValue = true
|
|
if reflect.DeepEqual(entry.compareValue, dependValue) {
|
|
entry.lastChecked = time.Now()
|
|
return entry.storeValue, nil
|
|
} else {
|
|
cacheInstance.Remove(key)
|
|
}
|
|
}
|
|
}
|
|
//从数据库加载数据
|
|
if value, err = f(WithContext(ctx)); err == nil {
|
|
if !hasDependValue {
|
|
if err = WithContext(ctx).Raw(opts.dependSQL, opts.dependArgs...).Scan(&dependValue).Error; err == nil {
|
|
cacheInstance.Add(key, &cacheEntry{
|
|
compareValue: dependValue,
|
|
storeValue: value,
|
|
createdAt: time.Now(),
|
|
lastChecked: time.Now(),
|
|
})
|
|
}
|
|
} else {
|
|
cacheInstance.Add(key, &cacheEntry{
|
|
compareValue: dependValue,
|
|
storeValue: value,
|
|
createdAt: time.Now(),
|
|
lastChecked: time.Now(),
|
|
})
|
|
}
|
|
return value, nil
|
|
} else {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
func Init(ctx context.Context, cfg config.Database, plugins ...gorm.Plugin) (err error) {
|
|
dbCfg := &mysql.Config{
|
|
Net: "tcp",
|
|
Addr: cfg.Address,
|
|
User: cfg.Username,
|
|
Passwd: cfg.Password,
|
|
DBName: cfg.Database,
|
|
AllowNativePasswords: true,
|
|
AllowOldPasswords: true,
|
|
Collation: "utf8mb4_unicode_ci",
|
|
Loc: time.Local,
|
|
CheckConnLiveness: true,
|
|
Params: make(map[string]string),
|
|
ParseTime: true,
|
|
MaxAllowedPacket: 4 << 20,
|
|
}
|
|
dbCfg.Params["charset"] = "utf8mb4"
|
|
if db, err = gorm.Open(mysqlDriver.Open(dbCfg.FormatDSN())); err != nil {
|
|
return
|
|
}
|
|
db = db.WithContext(ctx)
|
|
for _, plugin := range plugins {
|
|
if err = db.Use(plugin); err != nil {
|
|
return
|
|
}
|
|
}
|
|
if err = db.AutoMigrate(&types.Schema{}); err != nil {
|
|
return
|
|
}
|
|
return
|
|
}
|
|
|
|
func DB() *gorm.DB {
|
|
if db == nil {
|
|
panic("database component not initialized")
|
|
}
|
|
return db
|
|
}
|
|
|
|
func WithContext(ctx context.Context) *gorm.DB {
|
|
return DB().WithContext(ctx)
|
|
}
|