2019-05-22 23:16:55 +02:00
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package fs
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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2019-06-11 00:56:37 +02:00
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"strings"
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"time"
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2019-05-22 23:16:55 +02:00
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/filestream"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/metrics"
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)
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// ReadAtCloser is rand-access read interface.
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type ReadAtCloser interface {
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// ReadAt must read len(p) bytes from offset off to p.
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ReadAt(p []byte, off int64)
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// MustClose must close the reader.
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MustClose()
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}
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// ReaderAt implements rand-access read.
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type ReaderAt struct {
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f *os.File
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}
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// ReadAt reads len(p) bytes from off to p.
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func (ra *ReaderAt) ReadAt(p []byte, off int64) {
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if len(p) == 0 {
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return
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}
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n, err := ra.f.ReadAt(p, off)
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if err != nil {
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logger.Panicf("FATAL: cannot read %d bytes at offset %d of file %q: %s", len(p), off, ra.f.Name(), err)
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}
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if n != len(p) {
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logger.Panicf("FATAL: unexpected number of bytes read; got %d; want %d", n, len(p))
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}
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readCalls.Inc()
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readBytes.Add(len(p))
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}
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// MustClose closes ra.
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func (ra *ReaderAt) MustClose() {
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if err := ra.f.Close(); err != nil {
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logger.Panicf("FATAL: cannot close file %q: %s", ra.f.Name(), err)
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}
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readersCount.Dec()
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}
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// OpenReaderAt opens a file on the given path for random-read access.
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//
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// The file must be closed with MustClose when no longer needed.
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func OpenReaderAt(path string) (*ReaderAt, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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readersCount.Inc()
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ra := &ReaderAt{
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f: f,
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}
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return ra, nil
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}
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var (
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readCalls = metrics.NewCounter(`vm_fs_read_calls_total`)
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readBytes = metrics.NewCounter(`vm_fs_read_bytes_total`)
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readersCount = metrics.NewCounter(`vm_fs_readers`)
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)
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2019-06-11 22:13:04 +02:00
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// MustSyncPath syncs contents of the given path.
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func MustSyncPath(path string) {
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2019-05-22 23:16:55 +02:00
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d, err := os.Open(path)
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if err != nil {
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logger.Panicf("FATAL: cannot open %q: %s", path, err)
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}
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if err := d.Sync(); err != nil {
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_ = d.Close()
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logger.Panicf("FATAL: cannot flush %q to storage: %s", path, err)
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}
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if err := d.Close(); err != nil {
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logger.Panicf("FATAL: cannot close %q: %s", path, err)
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}
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}
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// WriteFile writes data to the given file path.
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//
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// WriteFile returns only after the file is fully written
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// to the underlying storage.
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func WriteFile(path string, data []byte) error {
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if IsPathExist(path) {
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return fmt.Errorf("cannot create file %q, since it already exists", path)
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}
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f, err := filestream.Create(path, false)
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if err != nil {
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return fmt.Errorf("cannot create file %q: %s", path, err)
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}
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if _, err := f.Write(data); err != nil {
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f.MustClose()
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return fmt.Errorf("cannot write %d bytes to file %q: %s", len(data), path, err)
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}
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// Sync and close the file.
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f.MustClose()
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// Sync the containing directory, so the file is guaranteed to appear in the directory.
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// See https://www.quora.com/When-should-you-fsync-the-containing-directory-in-addition-to-the-file-itself
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absPath, err := filepath.Abs(path)
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if err != nil {
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return fmt.Errorf("cannot obtain absolute path to %q: %s", path, err)
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}
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2019-06-11 21:54:07 +02:00
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parentDirPath := filepath.Dir(absPath)
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2019-06-11 22:13:04 +02:00
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MustSyncPath(parentDirPath)
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2019-05-22 23:16:55 +02:00
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return nil
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}
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// MkdirAllIfNotExist creates the given path dir if it isn't exist.
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func MkdirAllIfNotExist(path string) error {
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if IsPathExist(path) {
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return nil
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}
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2019-06-11 22:03:14 +02:00
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return mkdirSync(path)
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2019-05-22 23:16:55 +02:00
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}
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// MkdirAllFailIfExist creates the given path dir if it isn't exist.
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//
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// Returns error if path already exists.
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func MkdirAllFailIfExist(path string) error {
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if IsPathExist(path) {
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return fmt.Errorf("the %q already exists", path)
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}
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2019-06-11 22:03:14 +02:00
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return mkdirSync(path)
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}
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func mkdirSync(path string) error {
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if err := os.MkdirAll(path, 0755); err != nil {
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return err
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}
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// Sync the parent directory, so the created directory becomes visible
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// in the fs after power loss.
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parentDirPath := filepath.Dir(path)
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2019-06-11 22:13:04 +02:00
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MustSyncPath(parentDirPath)
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2019-06-11 22:03:14 +02:00
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return nil
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2019-05-22 23:16:55 +02:00
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}
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// RemoveDirContents removes all the contents of the given dir it it exists.
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//
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// It doesn't remove the dir itself, so the dir may be mounted
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// to a separate partition.
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func RemoveDirContents(dir string) {
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if !IsPathExist(dir) {
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// The path doesn't exist, so nothing to remove.
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return
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}
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d, err := os.Open(dir)
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if err != nil {
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logger.Panicf("FATAL: cannot open dir %q: %s", dir, err)
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}
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defer MustClose(d)
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names, err := d.Readdirnames(-1)
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if err != nil {
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logger.Panicf("FATAL: cannot read contents of the dir %q: %s", dir, err)
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}
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for _, name := range names {
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if name == "." || name == ".." || name == "lost+found" {
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// Skip special dirs.
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continue
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}
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fullPath := dir + "/" + name
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2019-06-11 00:56:37 +02:00
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if err := RemoveAllHard(fullPath); err != nil {
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2019-05-22 23:16:55 +02:00
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logger.Panicf("FATAL: cannot remove %q: %s", fullPath, err)
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}
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}
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2019-06-11 22:13:04 +02:00
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MustSyncPath(dir)
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2019-05-22 23:16:55 +02:00
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}
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// MustClose must close the given file f.
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func MustClose(f *os.File) {
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fname := f.Name()
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if err := f.Close(); err != nil {
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logger.Panicf("FATAL: cannot close %q: %s", fname, err)
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}
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}
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// IsPathExist returns whether the given path exists.
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func IsPathExist(path string) bool {
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if _, err := os.Stat(path); err != nil {
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if os.IsNotExist(err) {
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return false
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}
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logger.Panicf("FATAL: cannot stat %q: %s", path, err)
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}
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return true
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}
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// MustRemoveAllSynced removes path with all the contents
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// and syncs the parent directory, so it no longer contains the path.
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func MustRemoveAllSynced(path string) {
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2019-06-11 00:56:37 +02:00
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MustRemoveAll(path)
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2019-06-11 21:54:07 +02:00
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parentDirPath := filepath.Dir(path)
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2019-06-11 22:13:04 +02:00
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MustSyncPath(parentDirPath)
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2019-06-11 00:56:37 +02:00
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}
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// MustRemoveAll removes path with all the contents.
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func MustRemoveAll(path string) {
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if err := RemoveAllHard(path); err != nil {
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2019-05-22 23:16:55 +02:00
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logger.Panicf("FATAL: cannot remove %q: %s", path, err)
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}
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2019-06-11 00:56:37 +02:00
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}
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// RemoveAllHard removes path with all the contents.
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//
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// It properly handles NFS issue https://github.com/VictoriaMetrics/VictoriaMetrics/issues/61 .
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func RemoveAllHard(path string) error {
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err := os.RemoveAll(path)
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if err == nil {
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return nil
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}
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2019-06-12 00:07:02 +02:00
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if !isTemporaryNFSError(err) {
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2019-06-11 00:56:37 +02:00
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return err
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}
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2019-06-12 00:07:02 +02:00
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// NFS prevents from removing directories with open files.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/61 .
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2019-06-11 00:56:37 +02:00
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// Schedule for later directory removal.
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select {
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case removeDirCh <- path:
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default:
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return fmt.Errorf("cannot schedule %s for removal, since the removal queue is full (%d entries)", path, cap(removeDirCh))
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}
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return nil
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}
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var removeDirCh = make(chan string, 1024)
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func dirRemover() {
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for path := range removeDirCh {
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attempts := 0
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for {
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err := os.RemoveAll(path)
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if err == nil {
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break
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}
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2019-06-12 00:07:02 +02:00
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if !isTemporaryNFSError(err) {
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2019-06-11 00:56:37 +02:00
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logger.Errorf("cannot remove %q: %s", path, err)
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break
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}
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2019-06-12 00:07:02 +02:00
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// NFS prevents from removing directories with open files.
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// Sleep for a while and try again in the hope open files will be closed.
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/61 .
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2019-06-11 00:56:37 +02:00
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attempts++
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2019-06-12 00:07:02 +02:00
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if attempts > 10 {
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2019-06-11 00:56:37 +02:00
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logger.Errorf("cannot remove %q in %d attempts: %s", path, attempts, err)
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break
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}
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2019-06-12 00:07:02 +02:00
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time.Sleep(100 * time.Millisecond)
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2019-06-11 00:56:37 +02:00
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}
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}
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}
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2019-06-12 00:07:02 +02:00
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func isTemporaryNFSError(err error) bool {
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// See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/61 for details.
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errStr := err.Error()
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return strings.Contains(errStr, "directory not empty") || strings.Contains(errStr, "device or resource busy")
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}
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2019-06-11 00:56:37 +02:00
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func init() {
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go dirRemover()
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2019-05-22 23:16:55 +02:00
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}
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// HardLinkFiles makes hard links for all the files from srcDir in dstDir.
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func HardLinkFiles(srcDir, dstDir string) error {
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2019-06-11 22:03:14 +02:00
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if err := mkdirSync(dstDir); err != nil {
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2019-05-22 23:16:55 +02:00
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return fmt.Errorf("cannot create dstDir=%q: %s", dstDir, err)
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}
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d, err := os.Open(srcDir)
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if err != nil {
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return fmt.Errorf("cannot open srcDir=%q: %s", srcDir, err)
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}
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defer func() {
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if err := d.Close(); err != nil {
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logger.Panicf("FATAL: cannot close %q: %s", srcDir, err)
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}
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}()
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fis, err := d.Readdir(-1)
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if err != nil {
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return fmt.Errorf("cannot read files in scrDir=%q: %s", srcDir, err)
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}
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for _, fi := range fis {
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if IsDirOrSymlink(fi) {
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// Skip directories.
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continue
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}
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fn := fi.Name()
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srcPath := srcDir + "/" + fn
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dstPath := dstDir + "/" + fn
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if err := os.Link(srcPath, dstPath); err != nil {
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return err
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}
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}
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2019-06-11 22:13:04 +02:00
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MustSyncPath(dstDir)
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2019-05-22 23:16:55 +02:00
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return nil
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}
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// IsDirOrSymlink returns true if fi is directory or symlink.
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func IsDirOrSymlink(fi os.FileInfo) bool {
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return fi.IsDir() || (fi.Mode()&os.ModeSymlink == os.ModeSymlink)
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}
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// SymlinkRelative creates relative symlink for srcPath in dstPath.
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func SymlinkRelative(srcPath, dstPath string) error {
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baseDir := filepath.Dir(dstPath)
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srcPathRel, err := filepath.Rel(baseDir, srcPath)
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if err != nil {
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return fmt.Errorf("cannot make relative path for srcPath=%q: %s", srcPath, err)
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}
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return os.Symlink(srcPathRel, dstPath)
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}
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// ReadFullData reads len(data) bytes from r.
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func ReadFullData(r io.Reader, data []byte) error {
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n, err := io.ReadFull(r, data)
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if err != nil {
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if err == io.EOF {
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return io.EOF
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}
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return fmt.Errorf("cannot read %d bytes; read only %d bytes; error: %s", len(data), n, err)
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}
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if n != len(data) {
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logger.Panicf("BUG: io.ReadFull read only %d bytes; must read %d bytes", n, len(data))
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}
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return nil
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}
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// MustWriteData writes data to w.
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func MustWriteData(w io.Writer, data []byte) {
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if len(data) == 0 {
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return
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}
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n, err := w.Write(data)
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if err != nil {
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logger.Panicf("FATAL: cannot write %d bytes: %s", len(data), err)
|
|
|
|
}
|
|
|
|
if n != len(data) {
|
|
|
|
logger.Panicf("BUG: writer wrote %d bytes instead of %d bytes", n, len(data))
|
|
|
|
}
|
|
|
|
}
|