Gorm how to get addr(ip adn port) from a gorm.DB value

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I use "db.Callback().Query().After("gorm:after_query").Register("after_query", errCircult)" to register errCircult to detect db circult status. how can I get addr(ip adn port) from a gorm.DB value。 func errCircult(db *gorm.DB) { if db.Error != nil && db.Error != gorm.ErrRecordNotFound { ins, _ := MysqlPolarisApi.GetInstance(map[string]string{"ro": "sz"}) // how to get ip and report it to Circuit Breaker MysqlPolarisApi.CallResult(ins, model.RetFail, 1002, time.Duration(100)) } }

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