读写字节流的两个基本接口定义如下:
type Reader interface {
Read(p []byte) (n int, err error)
}
type Writer interface {
Write(p []byte) (n int, err error)
}
net.Conn这个接口也定义了上述两个函数,因此即是io.Reader接口也是io.Writer接口。
下面的代码利用net.Conn来执行两条redis客户端操作:
127.0.0.1:6380> set key 75
OK
127.0.0.1:6380> get key
"75"
package main
import (
"fmt"
"io"
"net"
)
func exec(wr io.Writer, rd io.Reader, cmd string) (string, error) {
var err error
_, err = wr.Write([]byte(cmd))
if err != nil {
return "", err
}
var p []byte = make([]byte, 1024, 1024)
_, err = rd.Read(p)
if err != nil && err != io.EOF {
return "", err
}
return string(p), nil
}
func main() {
var conn net.Conn
var err error
conn, err = net.Dial("tcp", "127.0.0.1:6380")
if err != nil {
fmt.Printf("err=%v\n", err)
return
}
var reply string
//set key 75
reply, err = exec(conn, conn, "*3\r\n$3\r\nSET\r\n$3\r\nkey\r\n$2\r\n75\r\n")
fmt.Printf("set key 75's reply=%s err=%v\n", reply, err)
//get key
reply, err = exec(conn, conn, "*2\r\n$3\r\nGET\r\n$3\r\nkey\r\n")
fmt.Printf("get key's reply=%s err=%v\n", reply, err)
}
输出:
set key 75's reply=+OK
err=<nil>
get key's reply=$2
75
err=<nil>
如果需要加入缓冲区请见另外一篇《Go语言:带有缓冲区的字节流读写(bufio.Reader/bufio.Writer)的示例之redis读写》
Redis文本协议详见《Redis Protocol specification》