Golang - [Iris] 关于数据库与REDIS操作

配置文件

package conf

import (
	"flag"
	"gopkg.in/yaml.v2"
	"io/ioutil"
	"IRIS_WEB/utility/db"
)

var Conf *Config

// 初始化解析参数
var _path string

func init() {
	flag.StringVar(&_path, "c", "./config.yaml", "default config path")
}

// 从配置文件中加载配置
func InitConfig() error {
	Conf = &Config{}

	content, err := ioutil.ReadFile(_path)
	if err == nil {
		err = yaml.Unmarshal(content, Conf)
	}
	return err
}

// 总的配置
type Config struct {
	Server ServerConf `yaml:"server"`
	Mysql  db.MysqlConf  `yaml:"mysql"`
	Redis  db.RedisConf  `yaml:"redis"`
}

// 服务的配置
type ServerConf struct {
	Port int `yaml:"port"`
}

mysql初始化

package db

import (
	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/mysql"
	"time"
)

var mysqlDB *gorm.DB

type MysqlConf struct {
	Dsn     string `yaml:"dsn"`
	MaxIdle int    `yaml:"maxIdle"`
	MaxOpen int    `yaml:"maxOpen"`
}

// 初始化mysql
func InitMysql(conf *MysqlConf) (err error){
	mysqlDB, err = gorm.Open("mysql", conf.Dsn)

	if err == nil {
		mysqlDB.DB().SetMaxIdleConns(conf.MaxIdle)
		mysqlDB.DB().SetMaxOpenConns(conf.MaxOpen)
		mysqlDB.DB().SetConnMaxLifetime(time.Duration(30) * time.Minute)

		err = mysqlDB.DB().Ping()
	}
	return
}

// 获取mysql连接
func GetMysql() *gorm.DB {
	return mysqlDB
}

// 关闭mysql
func CloseMysql() {
	if mysqlDB != nil {
		mysqlDB.Close()
	}
}

Redis初始化

package db

import (
	"errors"
	"github.com/garyburd/redigo/redis"
	"time"
)

var redisPool *redis.Pool

type RedisConf struct {
	Addr    string `yaml:"addr"`
	DB      int    `yaml:"db"`
	MaxIdle int    `yaml:"maxIdle"`
	MaxOpen int    `yaml:"maxOpen"`
}

// 初始化redis
func InitRedis(conf *RedisConf) (err error) {
	redisPool = &redis.Pool{
		MaxIdle:     conf.MaxIdle,
		MaxActive:   conf.MaxOpen,
		IdleTimeout: time.Duration(30) * time.Minute,
		Dial: func() (redis.Conn, error) {
			return redis.Dial("tcp", conf.Addr, redis.DialDatabase(conf.DB))
		},
	}

	conn := GetRedis()
	defer conn.Close()

	if r, _ := redis.String(conn.Do("PING")); r != "PONG" {
		err = errors.New("redis connect failed.")
	}

	return
}

// 获取redis连接
func GetRedis() redis.Conn {
	return redisPool.Get()
}

// 关闭redis
func CloseRedis() {
	if redisPool != nil {
		redisPool.Close()
	}
}

使用redis做异步锁

package locker

import (
	"IRIS_WEB/utility/db"
	"errors"
	"github.com/garyburd/redigo/redis"
	"time"
)

type Locker struct {
	Key    string
	Error  error
}

func Lock(key string) (locker *Locker) {
	locker = &Locker{Key: key}

	conn := db.GetRedis()
	defer conn.Close()

	r, _ := redis.String(conn.Do("SET", key, 1, "EX", 60, "NX"))

	if r != "OK" {
		locker.Error = errors.New("locker failed.")
	}

	return
}

func TryLock(key string, timeout time.Duration) (locker *Locker) {
	locker = &Locker{Key: key}

	conn := db.GetRedis()
	defer conn.Close()

	start := time.Now()
	for time.Now().Sub(start) < timeout {
		reply, _ := redis.String(conn.Do("SET", key, 1, "EX", 60, "NX"))

		if reply == "OK" {
			return
		}

		time.Sleep(time.Duration(200) * time.Millisecond)
	}

	locker.Error = errors.New("locker timeout.")
	return
}

func (lock *Locker) Close() {
	if lock.Error == nil {
		conn := db.GetRedis()
		defer conn.Close()

		conn.Do("DEL", lock.Key)
	}
}

使用redis做缓存

package cache

import (
	"IRIS_WEB/utility/db"
	"errors"
	"github.com/garyburd/redigo/redis"
	"time"
)

//设置缓存
func Set(key, val string, ttl time.Duration) error {
	conn := db.GetRedis()
	defer conn.Close()

	r, err := redis.String(conn.Do("SET", key, val, "EX", ttl.Seconds()))

	if err != nil {
		return err
	}

	if r != "OK" {
		return errors.New("NOT OK")
	}

	return nil
}

//获取缓存
func Get(key string) (string, error) {
	conn := db.GetRedis()
	defer conn.Close()

	r, err := redis.String(conn.Do("GET", key))

	if err != nil {
		return "", err
	}

	return r, nil
}