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backup.go
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backup.go
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package backup
import (
"encoding/json"
"fmt"
"io"
"os"
"time"
"beryju.io/gravity/pkg/extconfig"
"beryju.io/gravity/pkg/roles/backup/types"
"github.com/minio/minio-go/v7"
"go.uber.org/zap"
)
type BackupStatus struct {
Status string `json:"status,omitempty"`
Error string `json:"error,omitempty"`
Filename string `json:"filename,omitempty"`
Size int64 `json:"size,omitempty"`
Duration int64 `json:"duration,omitempty"`
Time time.Time `json:"time"`
}
const (
BackupStatusSuccess = "success"
BackupStatusStarted = "started"
BackupStatusFailed = "failed"
)
func (r *Role) setStatus(status *BackupStatus) {
backupStatus.WithLabelValues(status.Status).SetToCurrentTime()
if status.Status == BackupStatusSuccess {
backupSize.Set(float64(status.Size))
backupDuration.Set(float64(status.Duration))
}
jstatus, err := json.Marshal(status)
if err != nil {
r.log.Warn("failed to marshal status", zap.Error(err))
return
}
_, err = r.i.KV().Put(
r.ctx,
r.i.KV().Key(
types.KeyRole,
types.KeyStatus,
extconfig.Get().Instance.Identifier,
).String(),
string(jstatus),
)
if err != nil {
r.log.Warn("failed to save status", zap.Error(err))
return
}
}
func (r *Role) GetBackupName() string {
now := time.Now()
path := fmt.Sprintf("%s/gravity/%s/%s",
r.cfg.Path,
extconfig.FullVersion(),
extconfig.Get().Instance.Identifier)
fileName := fmt.Sprintf(
"%s/gravity-snapshot-%d_%d_%d",
path,
now.Year(),
now.Month(),
now.Day(),
)
return fileName
}
func (r *Role) snapshotToFile() (*os.File, error) {
reader, err := r.i.KV().Snapshot(r.ctx)
if err != nil {
r.log.Warn("failed to snapshot", zap.Error(err))
return nil, err
}
file, err := os.CreateTemp(os.TempDir(), "gravity-snapshot.*.etcd")
if err != nil {
return nil, err
}
// make a buffer to keep chunks that are read
buf := make([]byte, 1024)
for {
// read a chunk
n, err := reader.Read(buf)
if err != nil && err != io.EOF {
return nil, err
}
if n == 0 {
break
}
// write a chunk
if _, err := file.Write(buf[:n]); err != nil {
return nil, err
}
}
return file, nil
}
func (r *Role) SaveSnapshot() *BackupStatus {
start := time.Now()
status := &BackupStatus{
Status: BackupStatusFailed,
Time: time.Now(),
}
defer r.setStatus(status)
if r.mc == nil {
status.Error = "backup not configured"
return status
}
file, err := r.snapshotToFile()
if err != nil {
status.Error = err.Error()
return status
}
defer os.Remove(file.Name())
file.Seek(0, io.SeekStart)
stat, err := file.Stat()
if err != nil {
status.Error = err.Error()
return status
}
fileName := r.GetBackupName()
i, err := r.mc.PutObject(r.ctx, r.cfg.Bucket, fileName, file, stat.Size(), minio.PutObjectOptions{})
if err != nil {
r.log.Warn("failed to upload snapshot", zap.Error(err))
status.Error = err.Error()
return status
}
r.log.Info("Uploaded snapshot", zap.Int64("size", i.Size))
finish := time.Since(start)
status.Status = BackupStatusSuccess
status.Size = i.Size
status.Filename = fileName
status.Duration = int64(finish.Seconds())
return status
}
func (r *Role) ensureBucket() {
exists, err := r.mc.BucketExists(r.ctx, r.cfg.Bucket)
if err == nil && exists {
return
}
err = r.mc.MakeBucket(r.ctx, r.cfg.Bucket, minio.MakeBucketOptions{})
if err != nil {
r.log.Warn("failed to create bucket", zap.Error(err))
}
}