Improvements after review.
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parent
a18cb29fa8
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0167083da6
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@ -18,6 +18,7 @@ import (
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"encoding/binary"
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"encoding/binary"
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"fmt"
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"fmt"
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"io"
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"io"
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"io/ioutil"
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"os"
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"os"
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"path"
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"path"
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"path/filepath"
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"path/filepath"
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@ -38,8 +39,8 @@ import (
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)
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)
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const (
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const (
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// Version of the storage, as it can be found in the version file.
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// Version of the storage as it can be found in the version file.
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// Increment to protect against icompatible changes.
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// Increment to protect against incompatible changes.
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Version = 1
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Version = 1
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versionFileName = "VERSION"
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versionFileName = "VERSION"
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@ -124,15 +125,9 @@ func newPersistence(basePath string, chunkLen int, dirty bool) (*persistence, er
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dirtyPath := filepath.Join(basePath, dirtyFileName)
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dirtyPath := filepath.Join(basePath, dirtyFileName)
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versionPath := filepath.Join(basePath, versionFileName)
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versionPath := filepath.Join(basePath, versionFileName)
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if file, err := os.Open(versionPath); err == nil {
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if versionData, err := ioutil.ReadFile(versionPath); err == nil {
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defer file.Close()
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if persistedVersion, err := strconv.Atoi(strings.TrimSpace(string(versionData))); err != nil {
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data := make([]byte, 8)
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return nil, fmt.Errorf("cannot parse content of %s: %s", versionPath, versionData)
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n, err := file.Read(data)
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if err != nil {
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return nil, err
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}
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if persistedVersion, err := strconv.Atoi(strings.TrimSpace(string(data[:n]))); err != nil {
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return nil, fmt.Errorf("cannot parse content of %s: %s", versionPath, data[:n])
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} else if persistedVersion != Version {
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} else if persistedVersion != Version {
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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)
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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)
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}
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}
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@ -144,12 +139,11 @@ func newPersistence(basePath string, chunkLen int, dirty bool) (*persistence, er
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if err := os.MkdirAll(basePath, 0700); err != nil {
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if err := os.MkdirAll(basePath, 0700); err != nil {
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return nil, err
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return nil, err
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}
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}
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d, err := os.Open(basePath)
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fis, err := ioutil.ReadDir(basePath)
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if err != nil {
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if err != nil {
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return nil, err
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return nil, err
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}
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}
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defer d.Close()
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if len(fis) > 0 {
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if fis, _ := d.Readdir(1); len(fis) > 0 {
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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)
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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)
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}
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}
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// Finally we can write our own version into a new version file.
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// Finally we can write our own version into a new version file.
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