/
info.go
125 lines (116 loc) · 2.58 KB
/
info.go
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package analyzer
import (
"context"
"github.com/go-redis/redis/v8"
"errors"
"fmt"
"regexp"
"strconv"
"strings"
)
const (
redisVersion = "redis_version"
serverSection = "Server"
minVersion = "4.0.0"
)
type redisInfo map[string]map[string]string
// get parsed redis info
func getRedisMetaInfo(cli redis.UniversalClient) redisInfo {
infoStr, err := cli.Info(context.Background()).Result()
if err != nil {
fmt.Println(err.Error())
return nil
}
strings.Split(infoStr, "\n")
d := strings.Split(infoStr, "\n")
result := make(map[string]map[string]string, defaultSize)
var lastMap = make(map[string]string, defaultSize)
var lastSection string
for _, v := range d {
if len(strings.TrimSpace(v)) == 0 {
continue
}
if strings.Index(v, "#") == 0 && len(v) > 1 {
section := strings.TrimSpace(string(v[1:]))
// 上次的信息存储起来
if len(lastSection) > 0 {
result[lastSection] = lastMap
}
lastSection = section
lastMap = make(map[string]string, defaultSize)
} else {
kv := strings.Split(v, ":")
if len(kv) == 2 {
m := kv[0]
n := kv[1]
lastMap[strings.TrimSpace(m)] = strings.TrimSpace(n)
}
}
}
result[lastSection] = lastMap
return result
}
func getRedisVersion(cli redis.UniversalClient) string {
info := getRedisMetaInfo(cli)
if server, ok := info[serverSection]; ok {
if version, ok := server[redisVersion]; ok {
return version
}
}
return ""
}
// check if the redis support 'mem usage' command
func checkSupportMemUsage(cli redis.UniversalClient) bool {
version := getRedisVersion(cli)
if len(version) < 1 {
return false
}
i, err := compareVersion(version, minVersion)
if err != nil {
return false
}
return i > -1
}
// compare version of two strings
// like 2.0.0, 2.0.1, 2.0 etc.
func compareVersion(v1, v2 string) (int, error) {
p, _ := regexp.Compile(`[\d.]+`)
illegalVersion := !p.Match([]byte(v1)) || !p.Match([]byte(v2))
if illegalVersion {
return 0, errors.New("version illegal")
}
v1a := strings.Split(v1, ".")
v2a := strings.Split(v2, ".")
v1ia := make([]int, 0, len(v1a))
v2ia := make([]int, 0, len(v2a))
for i := range v1a {
if len(v1a[i]) > 0 {
v, _ := strconv.Atoi(v1a[i])
v1ia = append(v1ia, v)
}
}
for i := range v2a {
if len(v2a[i]) > 0 {
v, _ := strconv.Atoi(v2a[i])
v2ia = append(v2ia, v)
}
}
v2Len := len(v2ia)
for i := range v1ia {
if i < v2Len {
if v1ia[i] > v2ia[i] {
return 1, nil
} else if v1ia[i] == v2ia[i] {
continue
} else {
return -1, nil
}
} else {
return 1, nil
}
}
if len(v1ia) == len(v2ia) {
return 0, nil
}
return -1, nil
}