/
listing.go
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/
listing.go
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// Package bisync implements bisync
// Copyright (c) 2017-2020 Chris Nelson
package bisync
import (
"bufio"
"context"
"fmt"
"io"
"os"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/hash"
"github.com/rclone/rclone/fs/walk"
)
// ListingHeader defines first line of a listing
const ListingHeader = "# bisync listing v1 from"
// lineRegex and lineFormat define listing line format
//
// flags <- size -> <- hash -> id <------------ modtime -----------> "<----- remote"
// - 3009805 md5:xxxxxx - 2006-01-02T15:04:05.000000000-0700 "12 - Wait.mp3"
//
// flags: "-" for a file and "d" for a directory (reserved)
// hash: "type:value" or "-" (example: "md5:378840336ab14afa9c6b8d887e68a340")
// id: "-" (reserved)
const lineFormat = "%s %8d %s %s %s %q\n"
var lineRegex = regexp.MustCompile(`^(\S) +(\d+) (\S+) (\S+) (\d{4}-\d\d-\d\dT\d\d:\d\d:\d\d\.\d{9}[+-]\d{4}) (".+")$`)
// timeFormat defines time format used in listings
const timeFormat = "2006-01-02T15:04:05.000000000-0700"
// TZ defines time zone used in listings
var TZ = time.UTC
var tzLocal = false
// fileInfo describes a file
type fileInfo struct {
size int64
time time.Time
hash string
id string
}
// fileList represents a listing
type fileList struct {
list []string
info map[string]*fileInfo
hash hash.Type
}
func newFileList() *fileList {
return &fileList{
info: map[string]*fileInfo{},
list: []string{},
}
}
func (ls *fileList) empty() bool {
return len(ls.list) == 0
}
func (ls *fileList) has(file string) bool {
_, found := ls.info[file]
return found
}
func (ls *fileList) get(file string) *fileInfo {
return ls.info[file]
}
func (ls *fileList) put(file string, size int64, time time.Time, hash, id string) {
fi := ls.get(file)
if fi != nil {
fi.size = size
fi.time = time
} else {
fi = &fileInfo{
size: size,
time: time,
hash: hash,
id: id,
}
ls.info[file] = fi
ls.list = append(ls.list, file)
}
}
func (ls *fileList) getTime(file string) time.Time {
fi := ls.get(file)
if fi == nil {
return time.Time{}
}
return fi.time
}
func (ls *fileList) beforeOther(other *fileList, file string) bool {
thisTime := ls.getTime(file)
thatTime := other.getTime(file)
if thisTime.IsZero() || thatTime.IsZero() {
return false
}
return thisTime.Before(thatTime)
}
func (ls *fileList) afterTime(file string, time time.Time) bool {
fi := ls.get(file)
if fi == nil {
return false
}
return fi.time.After(time)
}
// save will save listing to a file.
func (ls *fileList) save(ctx context.Context, listing string) error {
file, err := os.Create(listing)
if err != nil {
return err
}
hashName := ""
if ls.hash != hash.None {
hashName = ls.hash.String()
}
_, err = fmt.Fprintf(file, "%s %s\n", ListingHeader, time.Now().In(TZ).Format(timeFormat))
if err != nil {
_ = file.Close()
_ = os.Remove(listing)
return err
}
for _, remote := range ls.list {
fi := ls.get(remote)
time := fi.time.In(TZ).Format(timeFormat)
hash := "-"
if hashName != "" && fi.hash != "" {
hash = hashName + ":" + fi.hash
}
id := fi.id
if id == "" {
id = "-"
}
flags := "-"
_, err = fmt.Fprintf(file, lineFormat, flags, fi.size, hash, id, time, remote)
if err != nil {
_ = file.Close()
_ = os.Remove(listing)
return err
}
}
return file.Close()
}
// loadListing will load listing from a file.
// The key is the path to the file relative to the Path1/Path2 base.
// File size of -1, as for Google Docs, prints a warning and won't be loaded.
func (b *bisyncRun) loadListing(listing string) (*fileList, error) {
file, err := os.Open(listing)
if err != nil {
return nil, err
}
defer func() {
_ = file.Close()
}()
reader := bufio.NewReader(file)
ls := newFileList()
lastHashName := ""
for {
line, err := reader.ReadString('\n')
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
line = strings.TrimSuffix(line, "\n")
if line == "" || line[0] == '#' {
continue
}
match := lineRegex.FindStringSubmatch(line)
if match == nil {
fs.Logf(listing, "Ignoring incorrect line: %q", line)
continue
}
flags, sizeStr, hashStr := match[1], match[2], match[3]
id, timeStr, nameStr := match[4], match[5], match[6]
sizeVal, sizeErr := strconv.ParseInt(sizeStr, 10, 64)
timeVal, timeErr := time.ParseInLocation(timeFormat, timeStr, TZ)
nameVal, nameErr := strconv.Unquote(nameStr)
hashName, hashVal, hashErr := parseHash(hashStr)
if hashErr == nil && hashName != "" {
if lastHashName == "" {
lastHashName = hashName
hashErr = ls.hash.Set(hashName)
} else if hashName != lastHashName {
fs.Logf(listing, "Inconsistent hash type in line: %q", line)
continue
}
}
if flags != "-" || id != "-" || sizeErr != nil || timeErr != nil || hashErr != nil || nameErr != nil {
fs.Logf(listing, "Ignoring incorrect line: %q", line)
continue
}
if ls.has(nameVal) {
fs.Logf(listing, "Duplicate line (keeping latest): %q", line)
if ls.afterTime(nameVal, timeVal) {
continue
}
}
ls.put(nameVal, sizeVal, timeVal.In(TZ), hashVal, id)
}
return ls, nil
}
func parseHash(str string) (string, string, error) {
if str == "-" {
return "", "", nil
}
if pos := strings.Index(str, ":"); pos > 0 {
name, val := str[:pos], str[pos+1:]
if name != "" && val != "" {
return name, val, nil
}
}
return "", "", fmt.Errorf("invalid hash %q", str)
}
// makeListing will produce listing from directory tree and write it to a file
func (b *bisyncRun) makeListing(ctx context.Context, f fs.Fs, listing string) (ls *fileList, err error) {
ci := fs.GetConfig(ctx)
depth := ci.MaxDepth
hashType := hash.None
if !ci.IgnoreChecksum {
// Currently bisync just honors --ignore-checksum
// TODO add full support for checksums and related flags
hashType = f.Hashes().GetOne()
}
ls = newFileList()
ls.hash = hashType
var lock sync.Mutex
err = walk.ListR(ctx, f, "", false, depth, walk.ListObjects, func(entries fs.DirEntries) error {
var firstErr error
entries.ForObject(func(o fs.Object) {
//tr := accounting.Stats(ctx).NewCheckingTransfer(o) // TODO
var (
hashVal string
hashErr error
)
if hashType != hash.None {
hashVal, hashErr = o.Hash(ctx, hashType)
if firstErr == nil {
firstErr = hashErr
}
}
time := o.ModTime(ctx).In(TZ)
id := "" // TODO
lock.Lock()
ls.put(o.Remote(), o.Size(), time, hashVal, id)
lock.Unlock()
//tr.Done(ctx, nil) // TODO
})
return firstErr
})
if err == nil {
err = ls.save(ctx, listing)
}
if err != nil {
b.abort = true
}
return
}
// checkListing verifies that listing is not empty (unless resynching)
func (b *bisyncRun) checkListing(ls *fileList, listing, msg string) error {
if b.opt.Resync || !ls.empty() {
return nil
}
fs.Errorf(nil, "Empty %s listing. Cannot sync to an empty directory: %s", msg, listing)
b.critical = true
return fmt.Errorf("empty %s listing: %s", msg, listing)
}