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cache_detector.go
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cache_detector.go
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package cdn
import (
"context"
"github.com/dragonflyoss/Dragonfly/apis/types"
cutil "github.com/dragonflyoss/Dragonfly/common/util"
"github.com/dragonflyoss/Dragonfly/supernode/store"
"github.com/sirupsen/logrus"
)
type cacheDetector struct {
cacheStore *store.Store
metaDataManager *fileMetaDataManager
}
func newCacheDetector(cacheStore *store.Store, metaDataManager *fileMetaDataManager) *cacheDetector {
return &cacheDetector{
cacheStore: cacheStore,
metaDataManager: metaDataManager,
}
}
// detectCache detects whether there is a corresponding file in the local.
// If any, check whether the entire file has been completely downloaded.
//
// If so, return the md5 of task file and return startPieceNum as -1.
// And if not, return the latest piece num that has been downloaded.
func (cd *cacheDetector) detectCache(ctx context.Context, task *types.TaskInfo) (int, *fileMetaData, error) {
var breakNum int
var metaData *fileMetaData
var err error
if metaData, err = cd.metaDataManager.readFileMetaData(ctx, task.ID); err == nil &&
checkSameFile(task, metaData) {
breakNum = cd.parseBreakNum(ctx, task, metaData)
}
logrus.Infof("detect cache breakNum: %d", breakNum)
if breakNum == 0 {
if metaData, err = cd.resetRepo(ctx, task); err != nil {
return 0, nil, err
}
}
// TODO: update the access time of task meta file for GC module
return breakNum, metaData, nil
}
func (cd *cacheDetector) parseBreakNum(ctx context.Context, task *types.TaskInfo, metaData *fileMetaData) int {
expired, err := cutil.IsExpired(task.TaskURL, task.Headers, metaData.LastModified, metaData.ETag)
if err != nil {
logrus.Errorf("failed to check whether the task(%s) has expired: %v", task.ID, err)
}
if expired {
return 0
}
if metaData.Finish {
if metaData.Success {
return -1
}
return 0
}
supportRange, err := cutil.IsSupportRange(task.TaskURL, task.Headers)
if err != nil {
logrus.Errorf("failed to check whether the task(%s) supports partial requests: %v", task.ID, err)
}
if !supportRange || task.FileLength < 0 {
return 0
}
return cd.parseBreakNumByCheckFile(ctx, task.ID)
}
func (cd *cacheDetector) parseBreakNumByCheckFile(ctx context.Context, taskID string) int {
cacheReader := newSuperReader()
reader, err := cd.cacheStore.Get(ctx, getDownloadRawFunc(taskID))
if err != nil {
logrus.Errorf("failed to read key file: %s : %v", taskID, err)
return 0
}
result, err := cacheReader.readFile(ctx, reader, false, false)
if err != nil {
logrus.Errorf("read file gets error: %v", err)
}
if result != nil {
return result.pieceCount
}
return 0
}
func (cd *cacheDetector) resetRepo(ctx context.Context, task *types.TaskInfo) (*fileMetaData, error) {
logrus.Infof("reset repo for taskID: %s", task.ID)
if err := deleteTaskFiles(ctx, cd.cacheStore, task.ID, false); err != nil {
return nil, err
}
return cd.metaDataManager.writeFileMetaDataByTask(ctx, task)
}
func checkSameFile(task *types.TaskInfo, metaData *fileMetaData) bool {
if cutil.IsNil(task) || cutil.IsNil(metaData) {
return false
}
if metaData.PieceSize != task.PieceSize {
return false
}
if metaData.TaskID != task.ID {
return false
}
if metaData.URL != task.TaskURL {
return false
}
if !cutil.IsEmptyStr(task.Md5) {
return metaData.Md5 == task.Md5
}
return metaData.Identifier == task.Identifier
}