go语言使用redis(redigo)
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原文作者:laijh
来源:简书
go的redis client用的比较多两个包是redix和redigo,因为beego cache模块里redis使用的是redigo,所以我也就使用这个包了。因为代码内容偏多,结构不清晰,不方便阅读,最后整理成一份思维导图,便于学习。当把整体分析,会发现提供给开发者使用的内容非常巧妙。
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Demo:
1package main
2
3import (
4 "fmt"
5 "github.com/gomodule/redigo/redis"
6 "log"
7)
8
9func main() {
10 c1, err := redis.Dial("tcp", "127.0.0.1:6379")
11 if err != nil {
12 log.Fatalln(err)
13 }
14 defer c1.Close()
15 c2, err := redis.DialURL("redis://127.0.0.1:6379")
16 if err != nil {
17 log.Fatalln(err)
18 }
19 defer c2.Close()
20
21
22 rec1, err := c1.Do("Get", "name")
23 fmt.Println(string(rec1.([]byte)))
24
25 c2.Send("Get", "name")
26 c2.Flush()
27 rec2, err := c2.Receive()
28 fmt.Println(string(rec2.([]byte)))
29}
下面内容是更加详细的源码分析
提供给开发者使用的内容
(1)变量
(2)常量
(3)新类型
(4)接口
(5)结构体
(6)函数
1、变量
var ErrNil = errors.New("redigo: nil returned")
2、常量
3、新类型
(1)type Args []interface{}
(2)type Error string
4、接口
(1)Conn
(2)ConnWithTimeout
(3)Scanner
(4)Argument
5、结构体
(1)DialOption
(2)Pool
(3)PoolStats
(4)Subscription
(5)PubSubConn
(6)Message
(7)Script
(8)Pong
6、函数
(1)func NewPool(newFn func() (Conn, error), maxIdle int) *Pool
(2)func NewScript(keyCount int, src string) *Script
(3)func NewLoggingConn(conn Conn, logger *log.Logger, prefix string) Conn
(4)func NewLoggingConnFilter(conn Conn, logger log.Logger, prefix string, skip func(cmdName string) bool) Conn
(5)func DoWithTimeout(c Conn, timeout time.Duration, cmd string, args ...interface{}) (interface{}, error)
(6)func DoWithTimeout(c Conn, timeout time.Duration, cmd string, args ...interface{}) (interface{}, error)
(7)func Int(reply interface{}, err error) (int, error)
(8)func Int64(reply interface{}, err error) (int64, error)
(9)func Uint64(reply interface{}, err error) (uint64, error)
(10)func Float64(reply interface{}, err error) (float64, error)
(11)func String(reply interface{}, err error) (string, error)
(12)func Bytes(reply interface{}, err error) ([]byte, error)
(13)func Bool(reply interface{}, err error) (bool, error)
(14)func MultiBulk(reply interface{}, err error) ([]interface{}, error)
(15)func Values(reply interface{}, err error) ([]interface{}, error)
(16)func Float64s(reply interface{}, err error) ([]float64, error)
(17)func Strings(reply interface{}, err error) ([]string, error)
(18)func ByteSlices(reply interface{}, err error) ([][]byte, error)
(19)func Int64s(reply interface{}, err error) ([]int64, error)
(20)func Ints(reply interface{}, err error) ([]int, error)
(21)func StringMap(result interface{}, err error) (map[string]string, error)
(22)func IntMap(result interface{}, err error) (map[string]int, error)
(23)func Int64Map(result interface{}, err error) (map[string]int64, error)
(24)func Positions(result interface{}, err error) ([][2]float64, error)
(25)func DialTimeout(network, address string, connectTimeout, readTimeout, writeTimeout time.Duration) (Conn, error)
(26)func DialReadTimeout(d time.Duration) DialOption
(27)func DialWriteTimeout(d time.Duration) DialOption
(28)func DialConnectTimeout(d time.Duration) DialOption
(29)func DialKeepAlive(d time.Duration) DialOption
(30)func DialNetDial(dial func(network, addr string) (net.Conn, error)) DialOption
(31)func DialDatabase(db int) DialOption
(32)func DialPassword(password string) DialOption
(33)func DialTLSConfig(c *tls.Config) DialOption
(34)func DialTLSSkipVerify(skip bool) DialOption
一、变量
var ErrNil = errors.New("redigo: nil returned")
暴露给开发者的目的是,因为从redis服务器获取数据的时候可能遇到值为空的情况。
二、常量
三、新类型
(1)type Args []interface{}
1type Args []interface{}
2
3func (args Args) Add(value ...interface{}) Args
4// Add是直接将值追加到args后面的结果返回,但是并不会修改到args
5func (args Args) AddFlat(v interface{}) Args
6// AddFlat根据值的类型存储,分为以下五种情况:Struct、Slice、Map、Ptr、其他类型
7(1)Struct:
8package main
9
10import (
11 "fmt"
12 "github.com/gomodule/redigo/redis"
13)
14
15type Ints struct {
16 A int
17 b int
18 C float32
19}
20
21func (Ints)Add() {
22 fmt.Println(123)
23}
24
25func main() {
26 i := Ints{1,2,1.2}
27 args := redis.Args{1,2,3}
28 args1 := args.AddFlat(i)
29 fmt.Println(args, len(args))
30 fmt.Println(args1, len(args1))
31}
32输出:
33[1 2 3] 3
34[1 2 3 A 1 C 1.2] 7
35(2)Slice:
36package main
37
38import (
39 "fmt"
40 "github.com/gomodule/redigo/redis"
41)
42
43func main() {
44 i := []int{1,2,12}
45 args := redis.Args{1,2,3}
46 args1 := args.AddFlat(i)
47 fmt.Println(args, len(args))
48 fmt.Println(args1, len(args1))
49}
50输出:
51[1 2 3] 3
52[1 2 3 1 2 12] 6
53(3)Map:
54package main
55
56import (
57 "fmt"
58 "github.com/gomodule/redigo/redis"
59)
60
61func main() {
62 i := map[int]string{1:"你好",2:"测试"}
63 args := redis.Args{1,2,3}
64 args1 := args.AddFlat(i)
65 fmt.Println(args, len(args))
66 fmt.Println(args1, len(args1))
67}
68输出:
69[1 2 3] 3
70[1 2 3 1 你好 2 测试] 7
71(4)Prt
72package main
73
74import (
75 "fmt"
76 "github.com/gomodule/redigo/redis"
77)
78
79func main() {
80 a := 123
81 i := &a
82 args := redis.Args{1,2,3}
83 args1 := args.AddFlat(i)
84 fmt.Println(args, len(args))
85 fmt.Println(args1, len(args1))
86}
87输出:
88[1 2 3] 3
89[1 2 3 0xc00008a2d8] 4
90(5)其他类型:
91package main
92
93import (
94 "fmt"
95 "github.com/gomodule/redigo/redis"
96)
97
98type Int int8
99
100func main() {
101 a := 123
102 b := Int(8)
103 args := redis.Args{1,2,3}
104 args1 := args.AddFlat(a)
105 args1 = args1.AddFlat(b)
106 fmt.Println(args, len(args))
107 fmt.Println(args1, len(args1))
108}
109输出:
110[1 2 3] 3
111[1 2 3 123 8] 5
(2)type Error string
1type Error string
2func (err Error) Error() string { return string(err) }
四、接口
(1)Conn
(2)ConnWithTimeout
(3)Scanner
(4)Argument
五、结构体
(1)DialOption
源码:
1type DialOption struct {
2 f func(*dialOptions)
3}
4
作用:该结构体是被设计成 当创建与redis服务器连接时,进行参数设置。
与该结构体有关的函数:
1(1)func DialReadTimeout(d time.Duration) DialOption
2设置读超时时间
3(2)func DialWriteTimeout(d time.Duration) DialOption
4设置读超时时间
5(3)func DialConnectTimeout(d time.Duration) DialOption
6设置连接超时时间
7(4)func DialKeepAlive(d time.Duration) DialOption
8(5)func DialNetDial(dial func(network, addr string) (net.Conn, error)) DialOption
9(6)func DialDatabase(db int) DialOption
10设置连接数据库
11(7)func DialPassword(password string) DialOption
12设置连接redis密码
13(8)func DialTLSConfig(c *tls.Config) DialOption
14设置TLS配置信息
15(9)func DialTLSSkipVerify(skip bool) DialOption
16是否跳过TLS验证
17(10)func DialUseTLS(useTLS bool) DialOption
18是否使用TLS
19
(2)Pool
源码:
1type Pool struct {
2 Dial func() (Conn, error)
3 TestOnBorrow func(c Conn, t time.Time) error
4 MaxIdle int
5 MaxActive int
6 IdleTimeout time.Duration
7 Wait bool
8 MaxConnLifetime time.Duration
9 chInitialized uint32
10 mu sync.Mutex
11 closed bool
12 active int
13 ch chan struct{}
14 idle idleList
15}
作用:用来管理redis连接池
相关函数:
1(1)func NewPool(newFn func() (Conn, error), maxIdle int) *Pool
2 创建一个连接池对象
3(2)func (p *Pool) Get() Conn
4 获取一个连接
5(3)func (p *Pool) Stats() PoolStats
6 获取池的状态
7(4)func (p *Pool) ActiveCount() int
8 获取存活数量
9(5)func (p *Pool) IdleCount() int
10 获取空闲数量
11(6)func (p *Pool) Close() error
12 关闭
13
(3)PoolStats
源码:
1type PoolStats struct {
2 ActiveCount int
3 IdleCount int
4}
作用:记录redis池中存活连接数量和空闲连接数
(4)Subscription
源码:
1type Subscription struct {
2 Kind string
3 Channel string
4 Count int
5}
作用:Subscription用于订阅或取消订阅通知。
相关函数:
Demo:
1package main
2
3import (
4 "fmt"
5 "github.com/gomodule/redigo/redis"
6 "log"
7 "reflect"
8)
9
10func main() {
11 rc, err := redis.Dial("tcp", "127.0.0.1:6379")
12 if err != nil {
13 log.Fatalln(err)
14 }
15 defer rc.Close()
16
17 rc.Send("SUBSCRIBE", "example")
18 rc.Flush()
19 for {
20 reply, err := redis.Values(rc.Receive())
21 if err != nil {
22 fmt.Println(err)
23 }
24 if len(reply) == 3 {
25 if reflect.TypeOf(reply[2]).String() == "[]uint8" {
26 fmt.Println(string(reply[2].([]byte)))
27 }
28 }
29 }
30}
(5)PubSubConn
源码:
1type PubSubConn struct {
2 Conn Conn
3}
相关函数:
1(1)func (c PubSubConn) Subscribe(channel ...interface{}) error
2 订阅给定的一个或多个频道的信息。
3(2)func (c PubSubConn) PSubscribe(channel ...interface{}) error
4 订阅一个或多个符合给定模式的频道。
5(3)func (c PubSubConn) Unsubscribe(channel ...interface{}) error
6 指退订给定的频道。
7(4)func (c PubSubConn) PUnsubscribe(channel ...interface{}) error
8 退订所有给定模式的频道。
9(5)func (c PubSubConn) Ping(data string) error
10 测试客户端是否能够继续连通
11(6)func (c PubSubConn) Receive() interface{}
12 获取回复信息
13(7)func (c PubSubConn) ReceiveWithTimeout(timeout time.Duration) interface{}
14 在指定时间内获取时间
15(8)func (c PubSubConn) Close() error
16 关闭
17
(6)Message
源码:
1type Message struct {
2 Channel string // 频道名称
3 Pattern string // 频道模式
4 Data []byte // 数据
5}
(7)Script
源码:
1type Script struct {
2 keyCount int
3 src string
4 hash string
5}
相关函数:
1(1)func NewScript(keyCount int, src string) *Script
2(2)func (s *Script) Hash() string
3(3)func (s *Script) Do(c Conn, keysAndArgs ...interface{}) (interface{}, error)
4(4)func (s *Script) SendHash(c Conn, keysAndArgs ...interface{}) error
5(5)func (s *Script) Send(c Conn, keysAndArgs ...interface{}) error
6(6)func (s *Script) Load(c Conn) error
7
(8)Pong
源码:
1type Pong struct {
2 Data string
3}
(6)函数
1(1)func NewPool(newFn func() (Conn, error), maxIdle int) *Pool
2(2)func NewScript(keyCount int, src string) *Script
3(3)func NewLoggingConn(conn Conn, logger *log.Logger, prefix string) Conn
4(4)func NewLoggingConnFilter(conn Conn, logger *log.Logger, prefix string, skip func(cmdName string) bool) Conn
5(5)func DoWithTimeout(c Conn, timeout time.Duration, cmd string, args ...interface{}) (interface{}, error)
6(6)func DoWithTimeout(c Conn, timeout time.Duration, cmd string, args ...interface{}) (interface{}, error)
7(7)func Int(reply interface{}, err error) (int, error)
8(8)func Int64(reply interface{}, err error) (int64, error)
9(9)func Uint64(reply interface{}, err error) (uint64, error)
10(10)func Float64(reply interface{}, err error) (float64, error)
11(11)func String(reply interface{}, err error) (string, error)
12(12)func Bytes(reply interface{}, err error) ([]byte, error)
13(13)func Bool(reply interface{}, err error) (bool, error)
14(14)func MultiBulk(reply interface{}, err error) ([]interface{}, error)
15(15)func Values(reply interface{}, err error) ([]interface{}, error)
16(16)func Float64s(reply interface{}, err error) ([]float64, error)
17(17)func Strings(reply interface{}, err error) ([]string, error)
18(18)func ByteSlices(reply interface{}, err error) ([][]byte, error)
19(19)func Int64s(reply interface{}, err error) ([]int64, error)
20(20)func Ints(reply interface{}, err error) ([]int, error)
21(21)func StringMap(result interface{}, err error) (map[string]string, error)
22(22)func IntMap(result interface{}, err error) (map[string]int, error)
23(23)func Int64Map(result interface{}, err error) (map[string]int64, error)
24(24)func Positions(result interface{}, err error) ([]*[2]float64, error)
25(25)func DialTimeout(network, address string, connectTimeout, readTimeout, writeTimeout time.Duration) (Conn, error)
26(26)func DialReadTimeout(d time.Duration) DialOption
27(27)func DialWriteTimeout(d time.Duration) DialOption
28(28)func DialConnectTimeout(d time.Duration) DialOption
29(29)func DialKeepAlive(d time.Duration) DialOption
30(30)func DialNetDial(dial func(network, addr string) (net.Conn, error)) DialOption
31(31)func DialDatabase(db int) DialOption
32(32)func DialPassword(password string) DialOption
33(33)func DialTLSConfig(c *tls.Config) DialOption
34(34)func DialTLSSkipVerify(skip bool) DialOption
35
经过学习源码发现,这些顶尖的设计者与我们普通开发者的区别在于,他们包设计非常巧妙,以及只把有必要的内容提供给开发者。
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