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Improvements after review.

This commit is contained in:
beorn7 2015-03-03 18:59:39 +01:00
parent a18cb29fa8
commit 0167083da6
1 changed files with 8 additions and 14 deletions
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22
storage/local/persistence.go
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@ -18,6 +18,7 @@ import (
"encoding/binary"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"path/filepath"
@ -38,8 +39,8 @@ import (
)
const (
// Version of the storage, as it can be found in the version file.
// Increment to protect against icompatible changes.
// Version of the storage as it can be found in the version file.
// Increment to protect against incompatible changes.
Version = 1
versionFileName = "VERSION"
@ -124,15 +125,9 @@ func newPersistence(basePath string, chunkLen int, dirty bool) (*persistence, er
dirtyPath := filepath.Join(basePath, dirtyFileName)
versionPath := filepath.Join(basePath, versionFileName)
if file, err := os.Open(versionPath); err == nil {
defer file.Close()
data := make([]byte, 8)
n, err := file.Read(data)
if err != nil {
return nil, err
}
if persistedVersion, err := strconv.Atoi(strings.TrimSpace(string(data[:n]))); err != nil {
return nil, fmt.Errorf("cannot parse content of %s: %s", versionPath, data[:n])
if versionData, err := ioutil.ReadFile(versionPath); err == nil {
if persistedVersion, err := strconv.Atoi(strings.TrimSpace(string(versionData))); err != nil {
return nil, fmt.Errorf("cannot parse content of %s: %s", versionPath, versionData)
} else if persistedVersion != Version {
return nil, fmt.Errorf("found storage version %d on disk, need version %d - please wipe storage or run a version of Prometheus compatible with storage version %d", persistedVersion, Version, persistedVersion)
}
@ -144,12 +139,11 @@ func newPersistence(basePath string, chunkLen int, dirty bool) (*persistence, er
if err := os.MkdirAll(basePath, 0700); err != nil {
return nil, err
}
d, err := os.Open(basePath)
fis, err := ioutil.ReadDir(basePath)
if err != nil {
return nil, err
}
defer d.Close()
if fis, _ := d.Readdir(1); len(fis) > 0 {
if len(fis) > 0 {
return nil, fmt.Errorf("could not detect storage version on disk, assuming version 0, need version %d - please wipe storage or run a version of Prometheus compatible with storage version 0", Version)
}
// Finally we can write our own version into a new version file.