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main.go
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main.go
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package main
import (
"errors"
"flag"
"fmt"
"os"
"path/filepath"
"sync"
"syscall"
"time"
"github.com/ajoyka/fdu/db"
"github.com/ajoyka/fdu/fastdu"
)
const (
_outputDateFile = "date-info.json"
_outputFile = "file-info.json"
_outputSizeFile = "size-info.json"
)
type fileCount struct {
mu sync.Mutex
files int64
nbytes int64
}
var (
// fileSizes is used for communicating file size of leaf nodes for incrementing
// fileCount
fileSizes = make(chan int64)
wg sync.WaitGroup
topFiles = flag.Int("t", 10, "number of top files/directories to display")
numOpenFiles = flag.Int("c", 20, "concurrency factor")
summary = flag.Bool("s", false, "print summary only")
printInterval = flag.Duration("f", 5*time.Second, "print summary at frequency specified in seconds; default disabled with value 0")
sema chan struct{}
)
func main() {
flag.Parse()
createBackup(_outputFile)
fastdu.SortedKeys(nil)
sema = make(chan struct{}, *numOpenFiles)
fmt.Println("concurrency factor", cap(sema), *numOpenFiles)
dirCount := fastdu.NewDirCount()
fileCount := &fileCount{}
roots := flag.Args()
var tick <-chan time.Time
if *printInterval != 0 {
tick = time.Tick(*printInterval)
}
var nbytes, files int64
fmt.Println()
go func() {
loop:
for {
select {
case size, ok := <-fileSizes:
if !ok {
break loop // fileSizes was closed
}
fileCount.Inc(size)
case <-tick:
files, nbytes = fileCount.Get()
fmt.Printf("%d files, %.1fGB\n", files, float64(nbytes)/1e9)
}
}
}()
for _, root := range roots {
wg.Add(1)
go walkDir(root, dirCount, fileSizes)
}
wg.Wait()
close(fileSizes)
db, err := db.New()
if err != nil {
fmt.Print(err)
os.Exit(1)
}
// defer db.Close()
dirCount.PrintFiles(*topFiles, *summary)
files, nbytes = fileCount.Get()
fmt.Printf("%d files, %.1fGB\n", files, float64(nbytes)/1e9)
dirCount.WriteMeta(_outputFile)
db.WriteMeta(dirCount.Meta)
dirCount.WriteMetaSortedByDate(_outputDateFile)
dirCount.WriteMetaSortedBySize(_outputSizeFile)
fmt.Println(dirCount.Counters())
}
// create backup file
func createBackup(file string) {
if _, err := os.Stat(file); err != nil {
return
}
var r []byte
var err error
if r, err = os.ReadFile(file); err != nil {
fmt.Println(err)
return
}
err = os.WriteFile(file+".bak", r, 0644)
if err != nil {
fmt.Println(err)
}
}
func walkDir(dir string, dirCount *fastdu.DirCount, fileSizes chan<- int64) {
defer wg.Done()
// handle case when fastdu is invoked including files as args like so: fastdu *
// check if 'dir' is a file
fInfo, err := os.Stat(dir)
if err != nil {
fmt.Print(err)
} else if !fInfo.IsDir() { // 'dir' is a file
dirCount.Inc(dir, fInfo.Size())
dirCount.AddFile(dir, fInfo)
fileSizes <- fInfo.Size()
return
}
for _, entry := range dirents(dir) {
if entry.IsDir() {
wg.Add(1)
go walkDir(filepath.Join(dir, entry.Name()), dirCount, fileSizes)
} else {
info, err := entry.Info()
if err != nil {
fmt.Printf("Error getting fileinfo %s: %v\n", entry.Name(), err)
continue
}
dirCount.Inc(dir, info.Size())
dirCount.AddFile(dir, info)
fileSizes <- info.Size()
}
}
}
func (f *fileCount) Inc(size int64) {
f.mu.Lock()
defer f.mu.Unlock()
f.files++
f.nbytes += size
}
func (f *fileCount) Get() (int64, int64) {
f.mu.Lock()
f.mu.Unlock()
return f.files, f.nbytes
}
func dirents(dir string) []os.DirEntry {
sema <- struct{}{} // acquire token
defer func() {
<-sema // release token
}()
dirEntries, err := os.ReadDir(dir)
if err != nil {
if errors.Is(err, syscall.EMFILE) {
fmt.Printf("\n**Error: %s\nReduce concurrency and retry\n", err)
os.Exit(1)
}
fmt.Printf("%s, %v\n", dir, err)
return nil
}
return dirEntries
}