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| package main
import (
"crypto/md5"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"sync"
"time"
)
var (
rootDir = "C:\\Users\\Administrator\\Downloads\\SM\\2016\\03\\19"
)
func main() {
startTime := time.Now()
rootPath := os.Args[1]
fmt.Println("计算目录", rootPath)
go spinner(250 * time.Millisecond)
m, err := MD5All(rootPath)
if err != nil {
fmt.Printf("\r%v\n", err)
return
}
var paths []string
for path := range m {
paths = append(paths, path)
}
sort.Strings(paths)
result := make(map[string]string, len(paths))
for _, path := range paths {
result[path] = fmt.Sprintf("%x", m[path])
}
fmt.Println("\r总耗时", time.Since(startTime), "总文件", len(result))
marshal, _ := json.MarshalIndent(result, "", " ")
writeRelFile(rootPath, marshal)
}
func writeRelFile(rootPath string, marshal []byte) {
writeFilePath := filepath.Join(rootPath, "marshal.json")
err := ioutil.WriteFile(writeFilePath, marshal, 0755)
if err != nil {
dir, errwd := os.Getwd()
if errwd != nil {
fmt.Printf("\r获取程序所在目录出错：%v\n", errwd)
return
}
if dir == rootPath {
fmt.Println("\r当前文件所在目录无权限，请切换目录后执行")
return
}
fmt.Printf("\r写入映射文件出错：%v，尝试写入到程序所在目录：%s\n", err, dir)
writeRelFile(dir, marshal)
return
}
fmt.Printf("\r映射文件已保存至【%s】目录。\n", writeFilePath)
}
func spinner(delay time.Duration) {
for {
for _, r := range `-\|/` {
fmt.Printf("\r%c", r)
time.Sleep(delay)
}
}
}
type result struct {
path string
sum [md5.Size]byte
err error
}
func sumFiles(done <-chan struct{}, root string) (<-chan result, <-chan error) {
c := make(chan result)
errc := make(chan error, 1)
go func() {
var wg sync.WaitGroup
err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if err != nil {
fmt.Printf("\rwalk has panic: %v\n", err)
return filepath.SkipDir
}
if !info.Mode().IsRegular() {
return nil
}
wg.Add(1)
go func() {
data, err := ioutil.ReadFile(path)
select {
case c <- result{path, md5.Sum(data), err}:
case <-done:
}
wg.Done()
}()
select {
case <-done:
return errors.New("walk canceled")
default:
return nil
}
})
go func() {
wg.Wait()
close(c)
}()
errc <- err
}()
return c, errc
}
func MD5All(root string) (map[string][md5.Size]byte, error) {
done := make(chan struct{})
defer close(done)
c, errc := sumFiles(done, root)
m := make(map[string][md5.Size]byte)
for r := range c {
if r.err != nil {
return nil, fmt.Errorf("code in 138 has panic: %v", r.err)
}
m[r.path] = r.sum
}
if err := <-errc; err != nil {
return nil, fmt.Errorf("code in 143 has panic: %v", err)
}
return m, nil
}
func MD5AllOld(root string) (map[string][md5.Size]byte, error) {
m := make(map[string][md5.Size]byte)
err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
if !info.Mode().IsRegular() {
return nil
}
data, err := ioutil.ReadFile(path)
if err != nil {
return err
}
m[path] = md5.Sum(data)
return nil
})
if err != nil {
return nil, err
}
return m, nil
}
|
