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orm.go
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orm.go
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// Copyright 2022 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package gorm
import (
"strings"
"gorm.io/driver/mysql"
"gorm.io/gorm"
)
type (
DB = gorm.DB
Model = gorm.Model
)
var (
// ErrRecordNotFound record not found error.
ErrRecordNotFound = gorm.ErrRecordNotFound
)
func open(options *Config) (*gorm.DB, error) {
inner, err := gorm.Open(mysql.Open(options.DSN), &options.gormConfig)
if err != nil {
return nil, err
}
// inner.(options.Debug)
// 设置默认连接配置
db, err := inner.DB()
if err != nil {
return nil, err
}
db.SetMaxIdleConns(options.MaxIdleConns)
db.SetMaxOpenConns(options.MaxOpenConns)
if options.ConnMaxLifetime != 0 {
db.SetConnMaxLifetime(options.ConnMaxLifetime)
}
// 开启 debug
if options.Debug {
inner = inner.Debug()
}
registerInterceptor(inner, options, metricInterceptor(), traceInterceptor())
return inner, err
}
// 收敛status,避免prometheus日志太多
func getStatement(err string) string {
if !strings.HasPrefix(err, "Errord") {
return "Unknown"
}
slice := strings.Split(err, ":")
if len(slice) < 2 {
return "Unknown"
}
// 收敛错误
return slice[0]
}
type processor interface {
Get(name string) func(*gorm.DB)
Replace(name string, handler func(*gorm.DB)) error
}
func registerInterceptor(db *gorm.DB, options *Config, interceptors ...Interceptor) {
dsn, err := parseDSN(options.DSN)
if err != nil {
panic(err)
}
var processors = []struct {
Name string
Processor processor
}{
{"gorm:create", db.Callback().Create()},
{"gorm:query", db.Callback().Query()},
{"gorm:delete", db.Callback().Delete()},
{"gorm:update", db.Callback().Update()},
{"gorm:row", db.Callback().Row()},
{"gorm:raw", db.Callback().Raw()},
}
for _, interceptor := range interceptors {
for _, processor := range processors {
handler := processor.Processor.Get(processor.Name)
handler = interceptor(dsn, processor.Name, options, handler)
if err := processor.Processor.Replace(processor.Name, handler); err != nil {
panic(err)
}
}
}
}