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path: root/vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go
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Diffstat (limited to 'vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go')
-rw-r--r--vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go300
1 files changed, 186 insertions, 114 deletions
diff --git a/vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go b/vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go
index 1189dec..9ba71fd 100644
--- a/vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go
+++ b/vendor/github.com/syndtr/goleveldb/leveldb/storage/file_storage.go
@@ -9,10 +9,12 @@ package storage
import (
"errors"
"fmt"
+ "io"
"io/ioutil"
"os"
"path/filepath"
"runtime"
+ "sort"
"strconv"
"strings"
"sync"
@@ -42,6 +44,30 @@ func (lock *fileStorageLock) Unlock() {
}
}
+type int64Slice []int64
+
+func (p int64Slice) Len() int { return len(p) }
+func (p int64Slice) Less(i, j int) bool { return p[i] < p[j] }
+func (p int64Slice) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
+
+func writeFileSynced(filename string, data []byte, perm os.FileMode) error {
+ f, err := os.OpenFile(filename, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+ if err != nil {
+ return err
+ }
+ n, err := f.Write(data)
+ if err == nil && n < len(data) {
+ err = io.ErrShortWrite
+ }
+ if err1 := f.Sync(); err == nil {
+ err = err1
+ }
+ if err1 := f.Close(); err == nil {
+ err = err1
+ }
+ return err
+}
+
const logSizeThreshold = 1024 * 1024 // 1 MiB
// fileStorage is a file-system backed storage.
@@ -60,7 +86,7 @@ type fileStorage struct {
day int
}
-// OpenFile returns a new filesytem-backed storage implementation with the given
+// OpenFile returns a new filesystem-backed storage implementation with the given
// path. This also acquire a file lock, so any subsequent attempt to open the
// same path will fail.
//
@@ -189,7 +215,8 @@ func (fs *fileStorage) doLog(t time.Time, str string) {
// write
fs.buf = append(fs.buf, []byte(str)...)
fs.buf = append(fs.buf, '\n')
- fs.logw.Write(fs.buf)
+ n, _ := fs.logw.Write(fs.buf)
+ fs.logSize += int64(n)
}
func (fs *fileStorage) Log(str string) {
@@ -210,7 +237,46 @@ func (fs *fileStorage) log(str string) {
}
}
-func (fs *fileStorage) SetMeta(fd FileDesc) (err error) {
+func (fs *fileStorage) setMeta(fd FileDesc) error {
+ content := fsGenName(fd) + "\n"
+ // Check and backup old CURRENT file.
+ currentPath := filepath.Join(fs.path, "CURRENT")
+ if _, err := os.Stat(currentPath); err == nil {
+ b, err := ioutil.ReadFile(currentPath)
+ if err != nil {
+ fs.log(fmt.Sprintf("backup CURRENT: %v", err))
+ return err
+ }
+ if string(b) == content {
+ // Content not changed, do nothing.
+ return nil
+ }
+ if err := writeFileSynced(currentPath+".bak", b, 0644); err != nil {
+ fs.log(fmt.Sprintf("backup CURRENT: %v", err))
+ return err
+ }
+ } else if !os.IsNotExist(err) {
+ return err
+ }
+ path := fmt.Sprintf("%s.%d", filepath.Join(fs.path, "CURRENT"), fd.Num)
+ if err := writeFileSynced(path, []byte(content), 0644); err != nil {
+ fs.log(fmt.Sprintf("create CURRENT.%d: %v", fd.Num, err))
+ return err
+ }
+ // Replace CURRENT file.
+ if err := rename(path, currentPath); err != nil {
+ fs.log(fmt.Sprintf("rename CURRENT.%d: %v", fd.Num, err))
+ return err
+ }
+ // Sync root directory.
+ if err := syncDir(fs.path); err != nil {
+ fs.log(fmt.Sprintf("syncDir: %v", err))
+ return err
+ }
+ return nil
+}
+
+func (fs *fileStorage) SetMeta(fd FileDesc) error {
if !FileDescOk(fd) {
return ErrInvalidFile
}
@@ -223,44 +289,10 @@ func (fs *fileStorage) SetMeta(fd FileDesc) (err error) {
if fs.open < 0 {
return ErrClosed
}
- defer func() {
- if err != nil {
- fs.log(fmt.Sprintf("CURRENT: %v", err))
- }
- }()
- path := fmt.Sprintf("%s.%d", filepath.Join(fs.path, "CURRENT"), fd.Num)
- w, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
- if err != nil {
- return
- }
- _, err = fmt.Fprintln(w, fsGenName(fd))
- if err != nil {
- fs.log(fmt.Sprintf("write CURRENT.%d: %v", fd.Num, err))
- return
- }
- if err = w.Sync(); err != nil {
- fs.log(fmt.Sprintf("flush CURRENT.%d: %v", fd.Num, err))
- return
- }
- if err = w.Close(); err != nil {
- fs.log(fmt.Sprintf("close CURRENT.%d: %v", fd.Num, err))
- return
- }
- if err != nil {
- return
- }
- if err = rename(path, filepath.Join(fs.path, "CURRENT")); err != nil {
- fs.log(fmt.Sprintf("rename CURRENT.%d: %v", fd.Num, err))
- return
- }
- // Sync root directory.
- if err = syncDir(fs.path); err != nil {
- fs.log(fmt.Sprintf("syncDir: %v", err))
- }
- return
+ return fs.setMeta(fd)
}
-func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {
+func (fs *fileStorage) GetMeta() (FileDesc, error) {
fs.mu.Lock()
defer fs.mu.Unlock()
if fs.open < 0 {
@@ -268,7 +300,7 @@ func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {
}
dir, err := os.Open(fs.path)
if err != nil {
- return
+ return FileDesc{}, err
}
names, err := dir.Readdirnames(0)
// Close the dir first before checking for Readdirnames error.
@@ -276,94 +308,134 @@ func (fs *fileStorage) GetMeta() (fd FileDesc, err error) {
fs.log(fmt.Sprintf("close dir: %v", ce))
}
if err != nil {
- return
- }
- // Find latest CURRENT file.
- var rem []string
- var pend bool
- var cerr error
- for _, name := range names {
- if strings.HasPrefix(name, "CURRENT") {
- pend1 := len(name) > 7
- var pendNum int64
- // Make sure it is valid name for a CURRENT file, otherwise skip it.
- if pend1 {
- if name[7] != '.' || len(name) < 9 {
- fs.log(fmt.Sprintf("skipping %s: invalid file name", name))
- continue
- }
- var e1 error
- if pendNum, e1 = strconv.ParseInt(name[8:], 10, 0); e1 != nil {
- fs.log(fmt.Sprintf("skipping %s: invalid file num: %v", name, e1))
- continue
- }
+ return FileDesc{}, err
+ }
+ // Try this in order:
+ // - CURRENT.[0-9]+ ('pending rename' file, descending order)
+ // - CURRENT
+ // - CURRENT.bak
+ //
+ // Skip corrupted file or file that point to a missing target file.
+ type currentFile struct {
+ name string
+ fd FileDesc
+ }
+ tryCurrent := func(name string) (*currentFile, error) {
+ b, err := ioutil.ReadFile(filepath.Join(fs.path, name))
+ if err != nil {
+ if os.IsNotExist(err) {
+ err = os.ErrNotExist
}
- path := filepath.Join(fs.path, name)
- r, e1 := os.OpenFile(path, os.O_RDONLY, 0)
- if e1 != nil {
- return FileDesc{}, e1
+ return nil, err
+ }
+ var fd FileDesc
+ if len(b) < 1 || b[len(b)-1] != '\n' || !fsParseNamePtr(string(b[:len(b)-1]), &fd) {
+ fs.log(fmt.Sprintf("%s: corrupted content: %q", name, b))
+ err := &ErrCorrupted{
+ Err: errors.New("leveldb/storage: corrupted or incomplete CURRENT file"),
}
- b, e1 := ioutil.ReadAll(r)
- if e1 != nil {
- r.Close()
- return FileDesc{}, e1
+ return nil, err
+ }
+ if _, err := os.Stat(filepath.Join(fs.path, fsGenName(fd))); err != nil {
+ if os.IsNotExist(err) {
+ fs.log(fmt.Sprintf("%s: missing target file: %s", name, fd))
+ err = os.ErrNotExist
}
- var fd1 FileDesc
- if len(b) < 1 || b[len(b)-1] != '\n' || !fsParseNamePtr(string(b[:len(b)-1]), &fd1) {
- fs.log(fmt.Sprintf("skipping %s: corrupted or incomplete", name))
- if pend1 {
- rem = append(rem, name)
- }
- if !pend1 || cerr == nil {
- metaFd, _ := fsParseName(name)
- cerr = &ErrCorrupted{
- Fd: metaFd,
- Err: errors.New("leveldb/storage: corrupted or incomplete meta file"),
- }
- }
- } else if pend1 && pendNum != fd1.Num {
- fs.log(fmt.Sprintf("skipping %s: inconsistent pending-file num: %d vs %d", name, pendNum, fd1.Num))
- rem = append(rem, name)
- } else if fd1.Num < fd.Num {
- fs.log(fmt.Sprintf("skipping %s: obsolete", name))
- if pend1 {
- rem = append(rem, name)
- }
+ return nil, err
+ }
+ return &currentFile{name: name, fd: fd}, nil
+ }
+ tryCurrents := func(names []string) (*currentFile, error) {
+ var (
+ cur *currentFile
+ // Last corruption error.
+ lastCerr error
+ )
+ for _, name := range names {
+ var err error
+ cur, err = tryCurrent(name)
+ if err == nil {
+ break
+ } else if err == os.ErrNotExist {
+ // Fallback to the next file.
+ } else if isCorrupted(err) {
+ lastCerr = err
+ // Fallback to the next file.
} else {
- fd = fd1
- pend = pend1
+ // In case the error is due to permission, etc.
+ return nil, err
}
- if err := r.Close(); err != nil {
- fs.log(fmt.Sprintf("close %s: %v", name, err))
+ }
+ if cur == nil {
+ err := os.ErrNotExist
+ if lastCerr != nil {
+ err = lastCerr
}
+ return nil, err
}
+ return cur, nil
}
- // Don't remove any files if there is no valid CURRENT file.
- if fd.Zero() {
- if cerr != nil {
- err = cerr
- } else {
- err = os.ErrNotExist
+
+ // Try 'pending rename' files.
+ var nums []int64
+ for _, name := range names {
+ if strings.HasPrefix(name, "CURRENT.") && name != "CURRENT.bak" {
+ i, err := strconv.ParseInt(name[8:], 10, 64)
+ if err == nil {
+ nums = append(nums, i)
+ }
}
- return
}
- if !fs.readOnly {
- // Rename pending CURRENT file to an effective CURRENT.
- if pend {
- path := fmt.Sprintf("%s.%d", filepath.Join(fs.path, "CURRENT"), fd.Num)
- if err := rename(path, filepath.Join(fs.path, "CURRENT")); err != nil {
- fs.log(fmt.Sprintf("CURRENT.%d -> CURRENT: %v", fd.Num, err))
- }
+ var (
+ pendCur *currentFile
+ pendErr = os.ErrNotExist
+ pendNames []string
+ )
+ if len(nums) > 0 {
+ sort.Sort(sort.Reverse(int64Slice(nums)))
+ pendNames = make([]string, len(nums))
+ for i, num := range nums {
+ pendNames[i] = fmt.Sprintf("CURRENT.%d", num)
}
- // Remove obsolete or incomplete pending CURRENT files.
- for _, name := range rem {
- path := filepath.Join(fs.path, name)
- if err := os.Remove(path); err != nil {
- fs.log(fmt.Sprintf("remove %s: %v", name, err))
+ pendCur, pendErr = tryCurrents(pendNames)
+ if pendErr != nil && pendErr != os.ErrNotExist && !isCorrupted(pendErr) {
+ return FileDesc{}, pendErr
+ }
+ }
+
+ // Try CURRENT and CURRENT.bak.
+ curCur, curErr := tryCurrents([]string{"CURRENT", "CURRENT.bak"})
+ if curErr != nil && curErr != os.ErrNotExist && !isCorrupted(curErr) {
+ return FileDesc{}, curErr
+ }
+
+ // pendCur takes precedence, but guards against obsolete pendCur.
+ if pendCur != nil && (curCur == nil || pendCur.fd.Num > curCur.fd.Num) {
+ curCur = pendCur
+ }
+
+ if curCur != nil {
+ // Restore CURRENT file to proper state.
+ if !fs.readOnly && (curCur.name != "CURRENT" || len(pendNames) != 0) {
+ // Ignore setMeta errors, however don't delete obsolete files if we
+ // catch error.
+ if err := fs.setMeta(curCur.fd); err == nil {
+ // Remove 'pending rename' files.
+ for _, name := range pendNames {
+ if err := os.Remove(filepath.Join(fs.path, name)); err != nil {
+ fs.log(fmt.Sprintf("remove %s: %v", name, err))
+ }
+ }
}
}
+ return curCur.fd, nil
}
- return
+
+ // Nothing found.
+ if isCorrupted(pendErr) {
+ return FileDesc{}, pendErr
+ }
+ return FileDesc{}, curErr
}
func (fs *fileStorage) List(ft FileType) (fds []FileDesc, err error) {
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