本文實例講述了go語言實現(xiàn)的memcache協(xié)議服務的方法。分享給大家供大家參考。具體如下：
完整實例代碼點擊此處本站下載。
1. Go語言代碼如下：
復制代碼 代碼如下:
package memcachep
import (
"bufio"
"fmt"
"io"
"strconv"
"strings"
)
//mc請求產生一個request對象
type MCRequest struct {
//請求命令
Opcode CommandCode
//key
Key string
//請求內容
Value []byte
//請求標識
Flags int
//請求內容長度
Length int
//過期時間
Expires int64
}
//request to string
func (req *MCRequest) String() string {
return fmt.Sprintf("{MCRequest opcode=%s, bodylen=%d, key='%s'}",
req.Opcode, len(req.Value), req.Key)
}
//將socket請求內容 解析為一個MCRequest對象
func (req *MCRequest) Receive(r *bufio.Reader) error {
line, _, err := r.ReadLine()
if err != nil || len(line) == 0 {
return io.EOF
}
params := strings.Fields(string(line))
command := CommandCode(params[0])
switch command {
case SET, ADD, REPLACE:
req.Opcode = command
req.Key = params[1]
req.Length, _ = strconv.Atoi(params[4])
value := make([]byte, req.Length+2)
io.ReadFull(r, value)
req.Value = make([]byte, req.Length)
copy(req.Value, value)
case GET:
req.Opcode = command
req.Key = params[1]
RunStats["cmd_get"].(*CounterStat).Increment(1)
case STATS:
req.Opcode = command
req.Key = ""
case DELETE:
req.Opcode = command
req.Key = params[1]
}
return err
}
2. Go語言代碼：
復制代碼 代碼如下:
package memcachep
import (
"fmt"
"io"
)
type MCResponse struct {
//命令
Opcoed CommandCode
//返回狀態(tài)
Status Status
//key
Key string
//返回內容
Value []byte
//返回標識
Flags int
//錯誤
Fatal bool
}
//解析response 并把返回結果寫入socket鏈接
func (res *MCResponse) Transmit(w io.Writer) (err error) {
switch res.Opcoed {
case STATS:
_, err = w.Write(res.Value)
case GET:
if res.Status == SUCCESS {
rs := fmt.Sprintf("VALUE %s %d %d\r\n%s\r\nEND\r\n", res.Key, res.Flags, len(res.Value), res.Value)
_, err = w.Write([]byte(rs))
} else {
_, err = w.Write([]byte(res.Status.ToString()))
}
case SET, REPLACE:
_, err = w.Write([]byte(res.Status.ToString()))
case DELETE:
_, err = w.Write([]byte("DELETED\r\n"))
}
return
}
3. Go語言代碼如下：
復制代碼 代碼如下:
package memcachep
import (
"fmt"
)
type action func(req *MCRequest, res *MCResponse)
var actions = map[CommandCode]action{
STATS: StatsAction,
}
//等待分發(fā)處理
func waitDispatch(rc chan chanReq) {
for {
input := -rc
input.response - dispatch(input.request)
}
}
//分發(fā)請求到響應的action操作函數(shù)上去
func dispatch(req *MCRequest) (res *MCResponse) {
if h, ok := actions[req.Opcode]; ok {
res = MCResponse{}
h(req, res)
} else {
return notFound(req)
}
return
}
//未支持命令
func notFound(req *MCRequest) *MCResponse {
var response MCResponse
response.Status = UNKNOWN_COMMAND
return response
}
//給request綁定上處理程序
func BindAction(opcode CommandCode, h action) {
actions[opcode] = h
}
//stats
func StatsAction(req *MCRequest, res *MCResponse) {
res.Fatal = false
stats := ""
for key, value := range RunStats {
stats += fmt.Sprintf("STAT %s %s\r\n", key, value)
}
stats += "END\r\n"
res.Value = []byte(stats)
}
希望本文所述對大家的Go語言程序設計有所幫助。
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