redisgo包
redisgo是一款go语言的redis客户端库。
为了简化对redis的操作，可以使用redisgo对redis常用命令进行封装。
首先在Github上面创建一个仓库redisgoExample
然后git clone将项目克隆到本地，比如说我的阿里云CentOS8服务器下，
git clone https://github.com/ccf19881030/redisgoExample.git
如下图所示：
克隆redisgoExample
当然运行go项目的前提是需要安装golang开发环境
进入到
redisgoExample目录，执行如下命令：
go mod init ybu.cn/iot
使用go mod init命令初始化一个ybu.cn/iot的自定义包
然后同样是在redisgoExample目录下运行go get命令安装redisgo客户端：
go get github.com/gomodule/redigo/redis
此时目录下会多出go.mod和go.sum文件，里面包含了redisgo包的引入。
go.mod文件内容如下所示：
module ybu.cn/iot
go 1.14
require github.com/gomodule/redigo v1.8.3
go.sum文件内容如下所示：
github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/gomodule/redigo v1.8.3 h1:HR0kYDX2RJZvAup8CsiJwxB4dTCSC0AaUq6S4SiLwUc=
github.com/gomodule/redigo v1.8.3/go.mod h1:P9dn9mFrCBvWhGE1wpxx6fgq7BAeLBk+UUUzlpkBYO0=
github.com/gomodule/redigo/redis v0.0.0-do-not-use h1:J7XIp6Kau0WoyT4JtXHT3Ei0gA1KkSc6bc87j9v9WIo=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
自定义的common包
在redisgoExample目录下新建一个common目录，再创建array.go、define.go、interface.go这三个go文件，用于一些数组、redis配置、redis数据结构的基本操作，
其内容分别如下：
1.array.go
package common
// ArrayOf does the array contain specified item
func ArrayOf(arr []string, dest string) bool {
for i := 0; i < len(arr); i++ {
if arr[i] == dest {
return true
}
}
return false
}
// ArrayDuplice 数组去重
func ArrayDuplice(arr []string) []string {
var out []string
tmp := make(map[string]byte)
for _, v := range arr {
tmplen := len(tmp)
tmp[v] = 0
if len(tmp) != tmplen {
out = append(out, v)
}
}
return out
}
2.define.go
package common
// RedisConnOpt connect redis options
type RedisConnOpt struct {
Enable bool
Host string
Port int32
Password string
Index int32
TTL int32
}
3.interface.go
package common
// RedisData 存储数据结构
type RedisData struct {
Key string
Field string
Value string
Expire int64
}
// RedisDataArray RedisData of array
type RedisDataArray []*RedisData
// IRedis redis client interface
type IRedis interface {
// KEYS get patten key array
KEYS(patten string) ([]string, error)
// SCAN get patten key array
SCAN(patten string) ([]string, error)
// DEL delete k-v
DEL(key string) (int, error)
// DELALL delete key array
DELALL(key []string) (int, error)
// GET get k-v
GET(key string) (string, error)
// SET set k-v
//SET(key string, value string) (int64, error)
// SETEX set k-v expire seconds
SETEX(key string, sec int, value string) (int64, error)
// EXPIRE set key expire seconds
EXPIRE(key string, sec int64) (int64, error)
// HGETALL get map of key
HGETALL(key string) (map[string]string, error)
// HGET get value of key-field
HGET(key string, field string) (string, error)
// HSET set value of key-field
//HSET(key string, field string, value string) (int64, error)
// Write 向redis中写入多组数据
Write(data RedisDataArray)
}
redisgo的封装
在redisgoExample目录下新建一个cache目录，在此目录下创建一个redis.go的文件，主要用于封装常见的redis命令，其内容如下：
package cache
import (
"fmt"
"log"
"time"
"github.com/gomodule/redigo/redis"
"ybu.cn/iot/common"
)
// https://godoc.org/github.com/gomodule/redigo/redis#pkg-examples
// https://github.com/gomodule/redigo
// RedisClient redis client instance
type RedisClient struct {
pool *redis.Pool
connOpt common.RedisConnOpt
// 数据接收
chanRx chan common.RedisDataArray
// 是否退出
isExit bool
}
// NewRedis new redis client
func NewRedis(opt common.RedisConnOpt) *RedisClient {
return &RedisClient{
connOpt: opt,
pool: newPool(opt),
chanRx: make(chan common.RedisDataArray, 100),
}
}
// newPool 线程池
func newPool(opt common.RedisConnOpt) *redis.Pool {
return &redis.Pool{
MaxIdle: 3,
IdleTimeout: 240 * time.Second,
// MaxActive: 10,
// Wait: true,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", fmt.Sprintf("%s:%d", opt.Host, opt.Port))
if err != nil {
log.Fatalf("Redis.Dial: %v", err)
return nil, err
}
if _, err := c.Do("AUTH", opt.Password); err != nil {
c.Close()
log.Fatalf("Redis.AUTH: %v", err)
return nil, err
}
if _, err := c.Do("SELECT", opt.Index); err != nil {
c.Close()
log.Fatalf("Redis.SELECT: %v", err)
return nil, err
}
return c, nil
},
}
}
// Start 启动接收任务协程
func (r *RedisClient) Start() {
r.isExit = false
// 开启协程用于循环接收数据
go r.loopRead()
}
// Stop 停止接收任务
func (r *RedisClient) Stop() {
r.isExit = true
// 关闭数据接收通道
close(r.chanRx)
// 关闭redis线程池
r.pool.Close()
}
// Write 向redis中写入多组数据
func (r *RedisClient) Write(data common.RedisDataArray) {
r.chanRx <- data
}
// loopRead 循环接收数据
func (r *RedisClient) loopRead() {
for !r.isExit {
select {
case rx := <-r.chanRx:
for _, it := range rx {
if len(it.Key) > 0 {
if len(it.Field) > 0 {
if _, err := r.HSET(it.Key, it.Field, it.Value); err != nil {
log.Printf("[%s, %s, %s]: %s\n", it.Key, it.Field, it.Value, err.Error())
}
} else {
if _, err := r.SET(it.Key, it.Value); err != nil {
log.Printf("[%s, %s, %s]: %s\n", it.Key, it.Field, it.Value, err.Error())
}
}
if it.Expire > 0 {
r.EXPIRE(it.Key, it.Expire)
}
}
}
}
}
}
// Error get redis connect error
func (r *RedisClient) Error() error {
conn := r.pool.Get()
defer conn.Close()
return conn.Err()
}
// 常用Redis操作命令的封装
// http://redis.io/commands
// KEYS get patten key array
func (r *RedisClient) KEYS(patten string) ([]string, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.Strings(conn.Do("KEYS", patten))
}
// SCAN 获取大量key
func (r *RedisClient) SCAN(patten string) ([]string, error) {
conn := r.pool.Get()
defer conn.Close()
var out []string
var cursor uint64 = 0xffffff
isfirst := true
for cursor != 0 {
if isfirst {
cursor = 0
isfirst = false
}
arr, err := conn.Do("SCAN", cursor, "MATCH", patten, "COUNT", 100)
if err != nil {
return out, err
}
switch arr := arr.(type) {
case []interface{}:
cursor, _ = redis.Uint64(arr[0], nil)
it, _ := redis.Strings(arr[1], nil)
out = append(out, it...)
}
}
out = common.ArrayDuplice(out)
return out, nil
}
// DEL delete k-v
func (r *RedisClient) DEL(key string) (int, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.Int(conn.Do("DEL", key))
}
// DELALL delete key array
func (r *RedisClient) DELALL(key []string) (int, error) {
conn := r.pool.Get()
defer conn.Close()
arr := make([]interface{}, len(key))
for i, v := range key {
arr[i] = v
}
return redis.Int(conn.Do("DEL", arr...))
}
// GET get k-v
func (r *RedisClient) GET(key string) (string, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.String(conn.Do("GET", key))
}
// SET set k-v
func (r *RedisClient) SET(key string, value string) (int64, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.Int64(conn.Do("SET", key, value))
}
// SETEX set k-v expire seconds
func (r *RedisClient) SETEX(key string, sec int, value string) (int64, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.Int64(conn.Do("SETEX", key, sec, value))
}
// EXPIRE set key expire seconds
func (r *RedisClient) EXPIRE(key string, sec int64) (int64, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.Int64(conn.Do("EXPIRE", key, sec))
}
// HGETALL get map of key
func (r *RedisClient) HGETALL(key string) (map[string]string, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.StringMap(conn.Do("HGETALL", key))
}
// HGET get value of key-field
func (r *RedisClient) HGET(key string, field string) (string, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.String(conn.Do("HGET", key, field))
}
// HSET set value of key-field
func (r *RedisClient) HSET(key string, field string, value string) (int64, error) {
conn := r.pool.Get()
defer conn.Close()
return redis.Int64(conn.Do("HSET", key, field, value))
}
测试redis客户端
在redisgoExample目录下新建一个redisgoExample.go文件用于测试，
其内容如下：
package main
import (
"fmt"
"time"
"ybu.cn/iot/cache"
"ybu.cn/iot/common"
)
func main() {
fmt.Println("redisgo client demo")
// redis的配置
redisOpt := common.RedisConnOpt{
true,
"127.0.0.1",
6379,
"123456",
3,
240,
}
_redisCli := cache.NewRedis(redisOpt)
// KEYS 示例
keys, err := _redisCli.KEYS("0_last_gb212_2011:*")
if err != nil {
fmt.Println("KEYS failed, err: %v", err)
}
for index, val := range keys {
fmt.Printf("第%d个值为：%s\n", index + 1, val)
}
// GET 示例
key, err := _redisCli.GET("username")
if err != nil {
fmt.Println("GET failed, err: %v", err)
}
fmt.Println("key: ", key)
// SET 示例
//i1, err := _redisCli.SET("month", "12")
//if err != nil {
// fmt.Println("SET failed, err: %v, %v", err, i1)
//}
// HGET 示例
name, err := _redisCli.HGET("animals", "name")
age, err := _redisCli.HGET("animals", "age")
sex, err := _redisCli.HGET("animals", "sex")
color, err := _redisCli.HGET("animals", "color")
fmt.Printf("animals: [name:%v], [age: %v], [sex: %v], [color: %v]\n", name, age, sex, color)
// HGETALL 示例
animalsMap, err := _redisCli.HGETALL("animals")
for k, v := range animalsMap {
fmt.Printf("k : %v, v: %v\t", k, v)
}
// redis client
_redisCli.Start()
defer _redisCli.Stop()
t1 := time.Now().UnixNano() / 1e6
a1, _ := _redisCli.SCAN("GB212_20*")
t2 := time.Now().UnixNano() / 1e6
a2, _ := _redisCli.KEYS("GB212_20*")
t3 := time.Now().UnixNano() / 1e6
fmt.Printf("SCAN time: %d\tlen: %d\nKEYS time: %d\tlen: %d\n", t2-t1, len(a1), t3-t2, len(a2))
}
我是在自己的阿里云服务器上运行的，并且redis密码改成自己阿里云服务器上的redis配置，运行结果如下图所示：
测试结果
最终的代码我已经上传至我的github仓库：https://github.com/ccf19881030/redisgoExample，需要的话可以自取：
git clone https://github.com/ccf19881030/redisgoExample.git
