OS相关|UA|Email|定时

• 文件系统管理 https://github.com/spf13/afero 和os.类似

var AppFs = afero.NewMemMapFs()
or
var AppFs = afero.NewOsFs()
AppFs.Open("/tmp/foo")

Chmod(name string, mode os.FileMode) : error
Chown(name string, uid, gid int) : error
Chtimes(name string, atime time.Time, mtime time.Time) : error
Create(name string) : File, error
Mkdir(name string, perm os.FileMode) : error
MkdirAll(path string, perm os.FileMode) : error
Name() : string
Open(name string) : File, error
OpenFile(name string, flag int, perm os.FileMode) : File, error
Remove(name string) : error
RemoveAll(path string) : error
Rename(oldname, newname string) : error
Stat(name string) : os.FileInfo, error
//文件接口和方法
io.Closer
io.Reader
io.ReaderAt
io.Seeker
io.Writer
io.WriterAt

Name() : string
Readdir(count int) : []os.FileInfo, error
Readdirnames(n int) : []string, error
Stat() : os.FileInfo, error
Sync() : error
Truncate(size int64) : error
WriteString(s string) : ret int, err error
//自定义方法
DirExists(path string) (bool, error)
Exists(path string) (bool, error)
FileContainsBytes(filename string, subslice []byte) (bool, error)
GetTempDir(subPath string) string
IsDir(path string) (bool, error)
IsEmpty(path string) (bool, error)
ReadDir(dirname string) ([]os.FileInfo, error)
ReadFile(filename string) ([]byte, error)
SafeWriteReader(path string, r io.Reader) (err error)
TempDir(dir, prefix string) (name string, err error)
TempFile(dir, prefix string) (f File, err error)
Walk(root string, walkFn filepath.WalkFunc) error
WriteFile(filename string, data []byte, perm os.FileMode) error
WriteReader(path string, r io.Reader) (err error)

• UA

"github.com/mssola/useragent"
ua := useragent.New("Mozilla/5.0 (Linux; U; Android 2.3.7; en-us; Nexus One Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1")
        fmt.Println(ua.UA())
        fmt.Printf("%v\n", ua.Bot()) 
        fmt.Println(ua.Browser()) //Edge 94.0.992.38
        fmt.Println(ua.Engine()) //引擎 AppleWebKit 537.36
        fmt.Println(ua.OS()) //系统windows10
        fmt.Println(ua.Platform()) //windows/linux
        fmt.Println(ua.Mobile()) //是否移动端

• 邮件发送 github.com/jordan-wright/email

    from :="logove@qq.com"
    to:=[]string{"yobybx1y@163.com"}
    nickname := "Yoby"
    secret := ""
    host :="smtp.qq.com"
    port := 25 //465是ssl
    isSSL := false //465设置true
    subject:="主题"
    body:="内容是测试"
  
    auth := smtp.PlainAuth("", from, secret, host)
    e := email.NewEmail()
    if nickname != "" {
        e.From = fmt.Sprintf("%s <%s>", nickname, from)
    } else {
        e.From = from
    }
    e.To = to
    e.Subject = subject
    e.HTML = []byte(body)
    var err error
    hostAddr := fmt.Sprintf("%s:%d", host, port)
    if isSSL {
        err = e.SendWithTLS(hostAddr, auth, &tls.Config{ServerName: host})
    } else {
        err = e.Send(hostAddr, auth)
    }

• 定时 “github.com/go-co-op/gocron/v2”

  s, _ := gocron.NewScheduler()
    j, _ := s.NewJob(
        gocron.DurationJob(
            2*time.Second, //每2秒
        ),
        gocron.NewTask(
            func(a string, b int) {
                fmt.Println(time.Now())
            },
            "hello",
            1,
        ),
    )
    fmt.Println(j.ID())
    s.Start()
    select {
    case <-time.After(time.Minute):
    }
    s.Shutdown()

• 定时另一个 github.com/robfig/cron/v3

• 版本排序

  version "github.com/hashicorp/go-version"
  func verSort(vv []string) []string {
    versions := make([]*version.Version, len(vv))
    for i, raw := range vv {
        v, _ := version.NewVersion(raw)
        versions[i] = v
    }
    sort.Sort(version.Collection(versions))
    ver := make([]string, len(vv))
    for i, s := range versions {
        ver[i] = s.Original()
  
    }
    return ver
  }
  v1, _ := version.NewVersion("1.2")
    v2, _ := version.NewVersion("1.5")
    if v1.LessThan(v2) { //LessThanOrEqual 包括等于 v1.Equal(v2)等于 GreaterThan大于 GreaterThanOrEquald大于等于
        fmt.Println("v1小于v2")
    }
    v1, _ = version.NewVersion("1.0")
    constraints, _ := version.NewConstraint(">= 1.0, < 1.4")
    if constraints.Check(v1) {
        fmt.Printf("v1在1.0-1.4之间,包括1.0")
    }

• 安全数据类型转换 https://github.com/spf13/cast

  cast.ToString("mayonegg")         // "mayonegg"
  cast.ToString(8)                  // "8"
  cast.ToString(8.31)               // "8.31"
  cast.ToString([]byte("one time")) // "one time"
  cast.ToString(nil)                // ""
  var foo interface{} = "one more time"
  cast.ToString(foo)                // "one more time"
  cast.ToInt(8)                  // 8
  cast.ToInt(8.31)               // 8
  cast.ToInt("8")                // 8
  cast.ToInt(true)               // 1
  cast.ToInt(false)              // 0
  var eight interface{} = 8
  cast.ToInt(eight)              // 8
  cast.ToInt(nil)                // 0