[Go] File 정보 확인

Go File 정보 확인

package file

import (
    "fmt"
    "os"
    "runtime"
    "syscall"
    "time"
)

const FILE_PATH = "data/big_data.txt"

type myFile struct {
    file *os.File
}

func newMyFile(file *os.File) *myFile {
    f := myFile{
        file: file,
    }
    return &f
}

func (f *myFile) showStat() {
    stat, err := f.file.Stat()
    if err != nil {
        panic(err)
    }
    /*
        type FileInfo interface {
        Name() string       // base name of the file
        Size() int64        // length in bytes for regular files; system-dependent for others
        Mode() FileMode     // file mode bits
        ModTime() time.Time // modification time
        IsDir() bool        // abbreviation for Mode().IsDir()
        Sys() any           // underlying data source (can return nil)
    */
    fmt.Println("===========  STAT  =============")
    fmt.Printf("Name: %s\n", stat.Name())
    fmt.Printf("Size: %d\n", stat.Size())
    fmt.Printf("Mode: %v\n", stat.Mode())
    fmt.Printf("IsDir: %t\n", stat.IsDir())
    fmt.Printf("ModTime: %v\n", stat.ModTime())
    fmt.Printf("ModTime.Local: %v\n", stat.ModTime().Local())
    fmt.Printf("ModTime.UTC: %v\n", stat.ModTime().UTC())

    if runtime.GOOS == "windows" {
        sys := stat.Sys().(*syscall.Win32FileAttributeData)
        lastAccessTime := time.Since(time.Unix(0, sys.LastAccessTime.Nanoseconds()))
        creationTime := time.Since(time.Unix(0, sys.CreationTime.Nanoseconds()))
        lastWriteTime := time.Since(time.Unix(0, sys.LastWriteTime.Nanoseconds()))

        fmt.Printf("LastAccessTime: %v\n", lastAccessTime)
        fmt.Printf("creationTime: %v\n", creationTime)
        fmt.Printf("lastWriteTime: %v\n", lastWriteTime)

    }
    // else {
    //     sys := stat.Sys()
    //     aTime := sys.(*syscall.Stat_t).Atim
    //     cTime := sys.(*syscall.Stat_t).Ctim
    //     mTime := sys.(*syscall.Stat_t).Mtim
    //     lastAccessTime := time.Since(time.Unix(aTime.Sec, aTime.Nsec))
    //     creationTime := time.Since(time.Unix(cTime.Sec, cTime.Nsec))
    //     lastWriteTime := time.Since(time.Unix(mTime.Sec, mTime.Nsec))
    // }
    fmt.Println("============================")
}

func (f *myFile) close() {
    f.file.Close()
}

func FileInfoMain() {
    file, err := os.Open(FILE_PATH)
    if err != nil {
        panic(err)
    }
    defer file.Close()

    myFile := newMyFile(file)
    myFile.showStat()
}

/* 
===========  STAT  =============
Name: big_data.txt
Size: 289998059
Mode: -rw-rw-rw-
IsDir: false
ModTime: 2022-07-20 20:28:46.6977735 +0900 KST
ModTime.Local: 2022-07-20 20:28:46.6977735 +0900 KST
ModTime.UTC: 2022-07-20 11:28:46.6977735 +0000 UTC
LastAccessTime: 51h22m46.2213526s
creationTime: 52h14m28.1290086s
lastWriteTime: 51h22m46.2213526s
============================
*/