VictoriaMetrics/lib/snapshot/snapshot.go

132 lines
3.5 KiB
Go

package snapshot
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"regexp"
"strings"
"sync/atomic"
"time"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
)
var snapshotNameRegexp = regexp.MustCompile(`^[0-9]{14}-[0-9A-Fa-f]+$`)
type snapshot struct {
Status string `json:"status"`
Snapshot string `json:"snapshot"`
Msg string `json:"msg"`
}
// Create creates a snapshot via the provided api endpoint and returns the snapshot name
func Create(createSnapshotURL string) (string, error) {
logger.Infof("Creating snapshot")
u, err := url.Parse(createSnapshotURL)
if err != nil {
return "", err
}
resp, err := http.Get(u.String())
if err != nil {
return "", err
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return "", err
}
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("unexpected status code returned from %q; expecting %d; got %d; response body: %q", createSnapshotURL, http.StatusOK, resp.StatusCode, body)
}
snap := snapshot{}
err = json.Unmarshal(body, &snap)
if err != nil {
return "", fmt.Errorf("cannot parse JSON response from %q: %w; response body: %q", createSnapshotURL, err, body)
}
if snap.Status == "ok" {
logger.Infof("Snapshot %s created", snap.Snapshot)
return snap.Snapshot, nil
} else if snap.Status == "error" {
return "", errors.New(snap.Msg)
} else {
return "", fmt.Errorf("Unkown status: %v", snap.Status)
}
}
// Delete deletes a snapshot via the provided api endpoint
func Delete(deleteSnapshotURL string, snapshotName string) error {
logger.Infof("Deleting snapshot %s", snapshotName)
formData := url.Values{
"snapshot": {snapshotName},
}
u, err := url.Parse(deleteSnapshotURL)
if err != nil {
return err
}
resp, err := http.PostForm(u.String(), formData)
if err != nil {
return err
}
body, err := io.ReadAll(resp.Body)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("unexpected status code returned from %q; expecting %d; got %d; response body: %q", deleteSnapshotURL, resp.StatusCode, http.StatusOK, body)
}
snap := snapshot{}
err = json.Unmarshal(body, &snap)
if err != nil {
return fmt.Errorf("cannot parse JSON response from %q: %w; response body: %q", deleteSnapshotURL, err, body)
}
if snap.Status == "ok" {
logger.Infof("Snapshot %s deleted", snapshotName)
return nil
} else if snap.Status == "error" {
return errors.New(snap.Msg)
} else {
return fmt.Errorf("Unkown status: %v", snap.Status)
}
}
// Validate validates the snapshotName
func Validate(snapshotName string) error {
_, err := Time(snapshotName)
return err
}
// Time returns snapshot creation time from the given snapshotName
func Time(snapshotName string) (time.Time, error) {
if !snapshotNameRegexp.MatchString(snapshotName) {
return time.Time{}, fmt.Errorf("unexpected snapshot name=%q; it must match %q regexp", snapshotName, snapshotNameRegexp.String())
}
n := strings.IndexByte(snapshotName, '-')
if n < 0 {
logger.Panicf("BUG: cannot find `-` in snapshotName=%q", snapshotName)
}
s := snapshotName[:n]
t, err := time.Parse("20060102150405", s)
if err != nil {
return time.Time{}, fmt.Errorf("unexpected timestamp=%q in snapshot name: %w; it must match YYYYMMDDhhmmss pattern", s, err)
}
return t, nil
}
// NewName returns new name for new snapshot
func NewName() string {
return fmt.Sprintf("%s-%08X", time.Now().UTC().Format("20060102150405"), nextSnapshotIdx())
}
func nextSnapshotIdx() uint64 {
return atomic.AddUint64(&snapshotIdx, 1)
}
var snapshotIdx = uint64(time.Now().UnixNano())