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mysql.go
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mysql.go
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package mysql
import (
"database/sql"
"fmt"
"time"
_ "github.com/go-sql-driver/mysql"
"github.com/kelseyhightower/envconfig"
"github.com/rs/zerolog/log"
)
const (
HighQPSMaxOpenConns = 100
AppNameLengthMax = 32
)
type Config struct {
Username string `default:"root"`
Password string `default:"my-secret"`
Host string `default:"localhost"`
Port int `default:"3306"`
DBName string `default:"test_db"`
MaxOpenConns int `default:"10"`
MaxIdleConns int `default:"10"`
MaxLifetime time.Duration `default:"60s"`
AppName string `default:""`
EnablePrometheus bool `default:"true"`
}
func (c *Config) String() string {
if c == nil {
return "nil"
}
copy := *c
copy.Password = "*hidden*"
return fmt.Sprintf("%+v", copy)
}
func (c *Config) Valid() error {
if len(c.AppName) == 0 || len(c.AppName) > AppNameLengthMax {
return fmt.Errorf("invalid AppName: %s", c)
}
return nil
}
func ConfigFromEnv() *Config {
config := &Config{}
envconfig.MustProcess("mysql", config)
return config
}
func ConfigFromEnvPrefix(prefix string) *Config {
config := &Config{}
envconfig.MustProcess(prefix, config)
return config
}
func RawMysqlConn(config *Config) (*sql.DB, error) {
db, err := sql.Open("mysql", fmt.Sprintf(
"%s:%s@tcp(%s:%d)/", config.Username, config.Password, config.Host, config.Port))
return db, err
}
func NewMysqlManager(config *Config) (Manager, error) {
return NewMysqlManagerWithMetrics(config)
}
func NewMysqlManagerWithMetrics(config *Config) (Manager, error) {
if config == nil {
config = ConfigFromEnv()
}
if config.MaxOpenConns < HighQPSMaxOpenConns {
log.Warn().Msgf(
"MysqlManager Config has MaxOpenConns = %d,"+
"which may be too low to handle high QPS.", config.MaxOpenConns)
}
if err := config.Valid(); err != nil {
return nil, err
}
manager, err := newManagerWithMetrics(config)
if err != nil {
return nil, err
}
err = manager.Ping()
if err != nil {
return nil, err
}
return manager, nil
}