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Copy pathfs-dir.go
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318 lines (275 loc) · 7.71 KB
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/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"io"
"os"
"path/filepath"
"sort"
"strings"
"time"
)
const (
// listObjectsLimit - maximum list objects limit.
listObjectsLimit = 1000
)
// isDirEmpty - returns whether given directory is empty or not.
func isDirEmpty(dirname string) (status bool, err error) {
f, err := os.Open(dirname)
if err == nil {
defer f.Close()
if _, err = f.Readdirnames(1); err == io.EOF {
status = true
err = nil
}
}
return
}
// isDirExist - returns whether given directory is exist or not.
func isDirExist(dirname string) (status bool, err error) {
fi, err := os.Lstat(dirname)
if err == nil {
status = fi.IsDir()
}
return
}
// byName implements sort.Interface for sorting os.FileInfo list.
type byName []os.FileInfo
func (f byName) Len() int {
return len(f)
}
func (f byName) Swap(i, j int) {
f[i], f[j] = f[j], f[i]
}
func (f byName) Less(i, j int) bool {
n1 := f[i].Name()
if f[i].IsDir() {
n1 = n1 + string(os.PathSeparator)
}
n2 := f[j].Name()
if f[j].IsDir() {
n2 = n2 + string(os.PathSeparator)
}
return n1 < n2
}
// ObjectInfo - object info.
type ObjectInfo struct {
Bucket string
Name string
ModifiedTime time.Time
ContentType string
MD5Sum string
Size int64
IsDir bool
Err error
}
// Using sort.Search() internally to jump to the file entry containing the prefix.
func searchFileInfos(fileInfos []os.FileInfo, x string) int {
processFunc := func(i int) bool {
return fileInfos[i].Name() >= x
}
return sort.Search(len(fileInfos), processFunc)
}
// re
8000
adDir - read 'scanDir' directory. It returns list of ObjectInfo.
// Each object name is appended with 'namePrefix'.
func readDir(scanDir, namePrefix, queryPrefix string, isFirst bool) (objInfos []ObjectInfo) {
f, err := os.Open(scanDir)
if err != nil {
objInfos = append(objInfos, ObjectInfo{Err: err})
return
}
fis, err := f.Readdir(-1)
if err != nil {
f.Close()
objInfos = append(objInfos, ObjectInfo{Err: err})
return
}
// Close the directory.
f.Close()
// Sort files by Name.
sort.Sort(byName(fis))
var prefixIndex int
// Searching for entries with objectName containing prefix.
// Binary search is used for efficient search.
if queryPrefix != "" && isFirst {
prefixIndex = searchFileInfos(fis, queryPrefix)
if prefixIndex == len(fis) {
return
}
if !strings.HasPrefix(fis[prefixIndex].Name(), queryPrefix) {
return
}
fis = fis[prefixIndex:]
}
// Populate []ObjectInfo from []FileInfo.
for _, fi := range fis {
name := fi.Name()
if queryPrefix != "" && isFirst {
// If control is here then there is a queryPrefix, and there are objects which satisfies the prefix.
// Since the result is sorted, the object names which satisfies query prefix would be stored one after the other.
// Push the objectInfo only if its contains the prefix.
// This ensures that the channel containing object Info would only has objects with the given queryPrefix.
if !strings.HasPrefix(name, queryPrefix) {
return
}
}
size := fi.Size()
modTime := fi.ModTime()
isDir := fi.Mode().IsDir()
// Add prefix if name prefix exists.
if namePrefix != "" {
name = namePrefix + "/" + name
}
// For directories explicitly end with '/'.
if isDir {
name += "/"
// size is set to '0' for directories explicitly.
size = 0
}
if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
// Handle symlink by doing an additional stat and follow the link.
st, e := os.Stat(filepath.Join(scanDir, name))
if e != nil {
objInfos = append(objInfos, ObjectInfo{Err: err})
return
}
size = st.Size()
modTime = st.ModTime()
isDir = st.Mode().IsDir()
// For directories explicitly end with '/'.
if isDir {
name += "/"
// size is set to '0' for directories explicitly.
size = 0
}
}
// Populate []ObjectInfo.
objInfos = append(objInfos, ObjectInfo{
Name: name,
ModifiedTime: modTime,
MD5Sum: "", // TODO
Size: size,
IsDir: isDir,
})
}
return
}
// ObjectInfoChannel - object info channel.
type ObjectInfoChannel struct {
ch <-chan ObjectInfo
objInfo *ObjectInfo
closed bool
timeoutCh <-chan struct{}
timedOut bool
}
func (oic *ObjectInfoChannel) Read() (ObjectInfo, bool) {
if oic.closed {
return ObjectInfo{}, false
}
if oic.objInfo == nil {
// First read.
if oi, ok := <-oic.ch; ok {
oic.objInfo = &oi
} else {
oic.closed = true
return ObjectInfo{}, false
}
}
retObjInfo := *oic.objInfo
status := true
oic.objInfo = nil
// Read once more to know whether it was last read.
if oi, ok := <-oic.ch; ok {
oic.objInfo = &oi
} else {
oic.closed = true
}
return retObjInfo, status
}
// IsClosed - return whether channel is closed or not.
func (oic ObjectInfoChannel) IsClosed() bool {
if oic.objInfo != nil {
return false
}
return oic.closed
}
// IsTimedOut - return whether channel is closed due to timeout.
func (oic ObjectInfoChannel) IsTimedOut() bool {
if oic.timedOut {
return true
}
select {
case _, ok := <-oic.timeoutCh:
if ok {
oic.timedOut = true
return true
}
return false
default:
return false
}
}
// treeWalk - walk into 'scanDir' recursively when 'recursive' is true.
// It uses 'bucketDir' to get name prefix for object name.
func treeWalk(scanDir, bucketDir string, recursive bool, queryPrefix string) ObjectInfoChannel {
objectInfoCh := make(chan ObjectInfo, listObjectsLimit)
timeoutCh := make(chan struct{}, 1)
// goroutine - retrieves directory entries, makes ObjectInfo and sends into the channel.
go func() {
defer close(objectInfoCh)
defer close(timeoutCh)
// send function - returns true if ObjectInfo is sent.
// Within (time.Second * 15) else false on time-out.
send := func(oi ObjectInfo) bool {
timer := time.After(time.Second * 15)
select {
case objectInfoCh <- oi:
return true
case <-timer:
timeoutCh <- struct{}{}
return false
}
}
namePrefix := strings.Replace(filepath.ToSlash(scanDir), filepath.ToSlash(bucketDir), "", 1)
if strings.HasPrefix(namePrefix, "/") {
// Remove forward slash ("/") from beginning.
namePrefix = namePrefix[1:]
}
// The last argument (isFisrt), is set to `true` only during the first run of the function.
// This makes sure that the sub-directories inside the prefixDir are recursed
// without being asserted for prefix in the object name.
isFirst := true
for objInfos := readDir(scanDir, namePrefix, queryPrefix, isFirst); len(objInfos) > 0; {
var objInfo ObjectInfo
objInfo, objInfos = objInfos[0], objInfos[1:]
if !send(objInfo) {
return
}
if objInfo.IsDir && recursive {
scanDir := filepath.Join(bucketDir, filepath.FromSlash(objInfo.Name))
namePrefix = strings.Replace(filepath.ToSlash(scanDir), filepath.ToSlash(bucketDir), "", 1)
if strings.HasPrefix(namePrefix, "/") {
/* remove beginning "/" */
namePrefix = namePrefix[1:]
}
// The last argument is set to false in the further calls to readdir.
isFirst = false
objInfos = append(readDir(scanDir, namePrefix, queryPrefix, isFirst), objInfos...)
}
}
}()
return ObjectInfoChannel{ch: objectInfoCh, timeoutCh: timeoutCh}
}