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package gopopulate
import (
"os"
"math/rand"
"time"
"strings"
"errors"
"bytes"
"archive/tar"
"io"
"io/ioutil"
)
const validChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMONPQRSTUVWXYZ-_."
var fileTypes = make([]string, 5)
var src rand.Source
func init() {
src = rand.NewSource(time.Now().UTC().UnixNano())
}
func PopulateDir(baseDir, types string, depth int, maxFiles int) error {
err := parseTypes(types)
if err != nil {
return err
}
err = popDirHelper(baseDir, depth, maxFiles)
if err != nil {
return err
}
return nil
}
func parseTypes(types string) error {
// make sure the slice is empty
fileTypes = fileTypes[:0]
for c := range(types) {
switch types[c] {
case 'd':
if !contains(fileTypes, "dir") {
fileTypes = append(fileTypes, "dir")
}
case 'r':
if !contains(fileTypes, "regFile") {
fileTypes = append(fileTypes, "regFile")
}
default:
return errors.New("Unexpected type char: " + string(types[c]))
}
}
return nil
}
func contains(arr []string, val string) bool {
for _, a := range(arr) {
if strings.Compare(a, val) == 0 {
return true
}
}
return false
}
func popDirHelper(baseDir string, depth, maxFiles int) error {
for numFiles := 0; numFiles < maxFiles; numFiles++ {
fileType := pickType()
newFile, err := genFile(baseDir, fileType)
if err != nil {
return err
}
if strings.Compare(fileType, "dir") == 0 && depth > 0 {
return popDirHelper(genFilePath(baseDir, newFile), depth - 1, maxFiles)
}
}
return nil
}
func pickType() string {
return fileTypes[src.Int63() % (int64)(len(fileTypes))]
}
func genFile(baseDir, fileType string) (string, error) {
var name string
if strings.Compare(fileType, "dir") == 0 {
name = genRandomName()
if err := os.Mkdir(genFilePath(baseDir, name), 0777); err != nil {
return "", err
}
} else if strings.Compare(fileType, "regFile") == 0 {
name := genRandomName()
path := genFilePath(baseDir, name)
_, err := os.Stat(path)
if os.IsNotExist(err) {
file, err := os.Create(path)
if err != nil {
return "", err
}
defer file.Close()
if err = writeDataToFile(file); err != nil {
return "", err
}
}
}
return name, nil
}
func genFilePath(baseDir, newFile string) string {
var buffer bytes.Buffer
buffer.WriteString(baseDir)
buffer.WriteString("/")
buffer.WriteString(newFile)
return buffer.String()
}
func genRandomName() string {
var length int64
for length == 0 {
length = rand.Int63() % 8
}
return genRandomString(length)
}
func writeDataToFile(f *os.File) error {
_, err := f.WriteString(genRandomDataForFile())
if err != nil {
return err
}
f.Sync()
return nil
}
func genRandomDataForFile() string {
lines := rand.Int63() % 64
var buffer bytes.Buffer
var i int64
for i = 0; i < lines; i++ {
length := rand.Int63() % 80
buffer.WriteString(genRandomString(length))
buffer.WriteString("\n")
}
return buffer.String()
}
func genRandomString(length int64) string {
name := make([]byte, length)
for i := range(name) {
name[i] = validChars[src.Int63() % int64(len(validChars))]
}
return string(name)
}
// Tar a directory and its subdirectories
func Tar(tarDir, tarPath string) error {
file, err := os.Create(tarPath)
if err != nil {
return err
}
tw := tar.NewWriter(file)
paths, err := generateFilePaths(tarDir)
if err != nil {
return err
}
for _, file := range paths {
if err := addToTar(tw, tarDir, file); err != nil {
return err
}
}
return nil
}
func generateFilePaths(basePath string) ([]string, error) {
files, err := ioutil.ReadDir(basePath)
if err != nil {
return nil, err
}
fileNames := make([]string, len(files))
for _, file := range files {
fileNames = append(fileNames, file.Name())
}
return fileNames, nil
}
func addToTar(tw *tar.Writer, basePath, path string) error {
file, err := os.Open(basePath + path)
if err != nil {
return err
}
defer file.Close()
if stat, err := file.Stat(); err == nil {
header := new(tar.Header)
header.Name = path
header.Size = stat.Size()
header.Mode = int64(stat.Mode())
header.ModTime = stat.ModTime()
if err = tw.WriteHeader(header); err != nil {
return err
}
if _, err = io.Copy(tw, file); err != nil {
return err
}
return nil
}
return err
}
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