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part_backup.go
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part_backup.go
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// -----------------------------------------------------------------------------
// CMDX Utilities Suite cmdx/[part_backup.go]
// (c) balarabe@protonmail.com License: GPLv3
// -----------------------------------------------------------------------------
package main
import (
"fmt"
"os"
"strings"
"time"
"github.com/balacode/zr"
)
// partBackup _ _
func partBackup(cmd Command, args []string) {
fileSize := func(filename string) int64 {
if !env.FileExists(filename) {
return 0
}
info, err := os.Stat(filename)
if err == nil {
return info.Size()
}
return -1
}
const ChunkSize = 1 * 1024 * 1024 // 1MB
chunk := make([]byte, ChunkSize)
list := map[string]bool{}
for {
for _, filename := range env.GetFilePaths(".", "*.part") {
_, exist := list[filename]
if !exist {
fmt.Println(filename, "ADDED")
list[filename] = true
}
}
for filename := range list {
name := filename
if !env.FileExists(name) {
if !strings.HasSuffix(name, ".part") {
continue
}
name = name[:len(name)-len(".part")]
}
if !env.FileExists(name) {
delete(list, filename)
continue
}
var (
srcSize = fileSize(name)
bakFile = name + ".bk"
bakSize = fileSize(bakFile)
)
if bakSize >= srcSize {
continue
}
// open the source file
src, err := os.Open(name)
if src == nil || err != nil {
zr.Error("Failed opening", name, "due to:", err)
continue
}
// open the target file
bak, err := os.OpenFile(bakFile,
os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0)
if bak == nil || err != nil {
zr.Error("Failed opening", bakFile, "due to:", err)
continue
}
// repeatedly read chunks from the file
hasErr := false
pos := int64(bakSize)
for {
// advance the reading position
_, err = src.Seek(pos, 0)
if err != nil {
zr.Error("Failed seeking", name, "due to:", err)
hasErr = true
break
}
// read the next chunk (nRead = number of bytes read)
nRead, err := src.Read(chunk[:])
if nRead == 0 {
break
}
if err != nil {
zr.Error("Failed reading", name, "due to:", err)
hasErr = true
break
}
// advance the writing position
_, err = bak.Seek(pos, 0)
if err != nil {
zr.Error("Failed seeking", bakFile, "due to:", err)
hasErr = true
break
}
// write the file
nWrit, err := bak.Write(chunk[:nRead])
if nWrit != nRead {
zr.Error("Failed writing", bakFile,
"read:", nRead, "written:", nWrit)
hasErr = true
break
}
if err != nil {
zr.Error("Failed writing", bakFile, "due to:", err)
hasErr = true
break
}
pos += int64(nWrit)
}
src.Close()
bak.Sync()
bak.Close()
s := zr.ByteSizeString(pos, false)
if hasErr {
fmt.Println(filename, s, "FAILED")
} else {
fmt.Println(filename, s)
}
}
time.Sleep(10 * time.Second)
}
}
// end