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mc.go
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mc.go
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package mymc
import (
"fmt"
"time"
//"fmt"
"dannytools/ehand"
"strconv"
"strings"
kitsSlice "github.com/toolkits/slice"
"github.com/youtube/vitess/go/memcache"
"github.com/ziutek/telnet"
)
// timeout: millisecond
func CreateMcConnectionTelnet(addr string, timeout uint32) (*telnet.Conn, error) {
con, err := telnet.DialTimeout("tcp", addr, time.Duration(timeout)*time.Millisecond)
if err != nil {
if con != nil {
con.Close()
}
return nil, ehand.WithStackError(err)
}
return con, nil
}
// wrTimeout, rdTimeout: millisecond
func SendCmdAndReadResultTelnet(mcClient *telnet.Conn, cmd string, wrTimeout uint32, rdTimeout uint32, readTo string) (string, error) {
if !strings.HasSuffix(cmd, "\r\n") {
cmd = fmt.Sprintf("%s\r\n", cmd)
}
err := mcClient.SetDeadline(time.Now().Add(time.Duration(wrTimeout) * time.Millisecond))
if err != nil {
return "", ehand.WithStackError(err)
}
_, err = mcClient.Write([]byte(cmd))
if err != nil {
return "", ehand.WithStackError(err)
}
err = mcClient.SetReadDeadline(time.Now().Add(time.Duration(rdTimeout) * time.Millisecond))
if err != nil {
return "", ehand.WithStackError(err)
}
result, err := mcClient.ReadUntil(readTo)
if err != nil {
//fmt.Printf("mc command %s: %s\n", cmd, string(result))
return "", ehand.WithStackError(err)
}
return strings.TrimSpace(string(result)), nil
}
func ParseMemcacheStats(lines string, metricsWanted []string) map[string]uint64 {
var (
err error
tmpUint uint64
result map[string]uint64 = map[string]uint64{}
)
lines = strings.TrimSpace(lines)
arr := strings.Split(lines, "\n")
for _, line := range arr {
line = strings.TrimSpace(line)
tmpArr := strings.Fields(line)
if tmpArr[0] != "STAT" {
continue
}
if !kitsSlice.ContainsString(metricsWanted, tmpArr[1]) {
continue
}
tmpUint, err = strconv.ParseUint(tmpArr[2], 10, 64)
if err != nil {
continue // only want number metric
}
result[tmpArr[1]] = tmpUint
}
return result
}
func GetMemcacheStatsTelnet(addr string, timeout uint32, cmd string, metricsWanted []string, wrTimeout uint32, rdTimeout uint32, readTo string) (map[string]uint64, error) {
var (
result map[string]uint64
err error
)
con, err := CreateMcConnectionTelnet(addr, timeout)
if con != nil {
defer con.Close()
}
if err != nil {
return result, err
}
lines, err := SendCmdAndReadResultTelnet(con, cmd, wrTimeout, rdTimeout, readTo)
if err != nil {
return result, err
}
result = ParseMemcacheStats(lines, metricsWanted)
return result, nil
}
func GetMemcacheVersionTelnet(addr string, timeout uint32, wrTimeout uint32, rdTimeout uint32) (string, error) {
con, err := CreateMcConnectionTelnet(addr, timeout)
if con != nil {
defer con.Close()
}
if err != nil {
return "", err
}
return GetMemcacheVersionTelnetCon(con, wrTimeout, rdTimeout)
}
func GetMemcacheVersionTelnetCon(mcClient *telnet.Conn, wrTimeout uint32, rdTimeout uint32) (string, error) {
return SendCmdAndReadResultTelnet(mcClient, "version", wrTimeout, rdTimeout, "\n")
}
// get version of memcached
func GetMemcacheVersion(mc *memcache.Connection) (result string, err error) {
/*
defer handleError(&err)
mc.setDeadline()
mc.writestrings("version\r\n")
mc.flush()
result = mc.readline()
return result, err
*/
return mc.SendCmdsAndGetOnlyOneLineResponse("version\r\n")
}
// this func is added into "github.com/youtube/vitess/go/memcache"
// added by danny lai
/*
func (mc *Connection) SendCmdsAndGetOnlyOneLineResponse(cmd string) (result string, err error) {
defer handleError(&err)
mc.setDeadline()
mc.writestrings(cmd)
mc.flush()
result = mc.readline()
return result, err
}
*/