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main.go
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main.go
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package main
import (
"path/filepath"
"io"
"compress/gzip"
"io/fs"
"os"
"flag"
"time"
"fmt"
)
type CandidateFiles struct {
RootPath string
Pattern string
Before time.Duration
}
type Level int
type Log struct {
Level Level
}
const (
Verbose Level = iota
Info
Quiet
)
var logger *Log
func main() {
path := flag.String("path", "", "Directory path were start to look for files")
pattern := flag.String("pattern", "*", "Pattern files to compress")
before := flag.Duration("before", time.Minute * 15, "Time file was modified/accesed before now to set for gzip compress")
recursive := flag.Bool("recursive", true, "Scan directories in recursive mode")
verbose := flag.Bool("verbose", false, "Enable verbosing mode")
quiet := flag.Bool("quiet", false, "Quiet mode")
keep := flag.Bool("keep", false, "Keep original files")
flag.Parse()
if *path == "" {
fmt.Fprintln(os.Stderr, "path parameter can not be empty")
os.Exit(1)
}
level := Info
if *verbose {
level = Verbose
}
if *quiet {
level = Quiet
}
logger = &Log{level}
cf := &CandidateFiles {
RootPath: *path,
Pattern: *pattern,
Before: *before,
}
var files []string
if *recursive{
files = cf.ScanRecursive()
} else {
panic("Not implemented jet")
}
for _, f := range files {
CompressGZ(f, !(*keep))
}
}
func (cf *CandidateFiles) ScanRecursive() []string{
result := make([]string, 0)
// Scan path
filepath.WalkDir(
cf.RootPath,
func(p string, d fs.DirEntry, e error) error {
if checkCandidateFile(cf.Pattern, cf.Before, p, d, e) {
result = append(result, p)
}
return nil
},
)
return result
}
func CompressGZ(fileName string, remove bool) error {
// Source
src, err := os.Open(fileName)
if err != nil {
return fmt.Errorf("when open source file, %s: %w", fileName, err)
}
defer src.Close()
// Destination
dstFileName := fmt.Sprintf("%s.gz", fileName)
dst, err := os.Create(dstFileName)
if err != nil {
return fmt.Errorf("when open destination file, %s: %w", fileName, err)
}
defer dst.Close()
logger.log(Info, "Compressing", fileName, "to", dstFileName)
// Archiver
archiver := gzip.NewWriter(dst)
archiver.Name = filepath.Base(fileName)
defer archiver.Close()
_, err = io.Copy(archiver, src)
if err != nil {
return fmt.Errorf("when compress file %s -> %s: %w", fileName, dstFileName, err)
}
if remove {
err = src.Close()
if err != nil {
logger.log(Info, "Error when close orig file", err)
}
err := os.Remove(fileName)
if err != nil {
return fmt.Errorf("when remove original file %s: %w", fileName, err)
}
logger.log(Verbose, "Original file", fileName, "removed")
} else {
logger.log(Verbose, "File", fileName, "kept")
}
return nil
}
func (l *Log)log(level Level, v ...interface{}) {
if l.Level != Quiet {
if l.Level == Verbose || l.Level == level {
fmt.Println(v...)
}
}
}
func checkCandidateFile(pattern string, before time.Duration, p string, d fs.DirEntry, e error) bool {
now := time.Now()
if e != nil {
logger.log(Info, "Ignoring", p, "because we get error:", e)
} else {
if ! d.IsDir(){
base := filepath.Base(p)
m, err := filepath.Match(pattern, base)
if err != nil {
logger.log(Info, "Ignoring", p, "because we get error when match pattern", pattern, ". Err:", err)
} else if m {
if filepath.Ext(p) == ".gz" {
logger.log(Info, "Ignoring", p, "because its extension is '.gz'")
} else {
inf, err := d.Info()
if err != nil {
logger.log(Info, "Ignoring", p, "because we get error when extract info", err)
} else {
modTime := inf.ModTime()
if modTime.Add(before).Before(now) {
destName := fmt.Sprintf("%s.gz", p)
if _, err := os.Stat(destName); !os.IsNotExist(err) {
logger.log(Info, "Ignoring", p, "because compressed file", destName, "exists")
} else {
logger.log(
Verbose,
"File", p, "compliant with requirements. Modtime",
modTime.Format(time.RFC3339),
"is before more than", before, "from current time:", now.Format(time.RFC3339))
return true
}
} else {
logger.log(Info, "Ignoring", p, "because file modification time", modTime, "is after that thresold", before)
}
}
}
}
}
}
return false
}