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package meta_cache
import (
"context"
"os"
"sync"
"time"
"golang.org/x/sync/singleflight"
"github.com/seaweedfs/seaweedfs/weed/filer"
"github.com/seaweedfs/seaweedfs/weed/filer/leveldb"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util"
)
// need to have logic similar to FilerStoreWrapper
// e.g. fill fileId field for chunks
type MetaCache struct {
root util.FullPath
localStore filer.VirtualFilerStore
leveldbStore *leveldb.LevelDBStore // direct reference for batch operations
sync.RWMutex
uidGidMapper *UidGidMapper
markCachedFn func(fullpath util.FullPath)
isCachedFn func(fullpath util.FullPath) bool
invalidateFunc func(fullpath util.FullPath, entry *filer_pb.Entry)
visitGroup singleflight.Group // deduplicates concurrent EnsureVisited calls for the same path
}
func NewMetaCache(dbFolder string, uidGidMapper *UidGidMapper, root util.FullPath,
markCachedFn func(path util.FullPath), isCachedFn func(path util.FullPath) bool, invalidateFunc func(util.FullPath, *filer_pb.Entry)) *MetaCache {
leveldbStore, virtualStore := openMetaStore(dbFolder)
return &MetaCache{
root: root,
localStore: virtualStore,
leveldbStore: leveldbStore,
markCachedFn: markCachedFn,
isCachedFn: isCachedFn,
uidGidMapper: uidGidMapper,
invalidateFunc: func(fullpath util.FullPath, entry *filer_pb.Entry) {
invalidateFunc(fullpath, entry)
},
}
}
func openMetaStore(dbFolder string) (*leveldb.LevelDBStore, filer.VirtualFilerStore) {
os.RemoveAll(dbFolder)
os.MkdirAll(dbFolder, 0755)
store := &leveldb.LevelDBStore{}
config := &cacheConfig{
dir: dbFolder,
}
if err := store.Initialize(config, ""); err != nil {
glog.Fatalf("Failed to initialize metadata cache store for %s: %+v", store.GetName(), err)
}
return store, filer.NewFilerStoreWrapper(store)
}
func (mc *MetaCache) InsertEntry(ctx context.Context, entry *filer.Entry) error {
mc.Lock()
defer mc.Unlock()
return mc.doInsertEntry(ctx, entry)
}
func (mc *MetaCache) doInsertEntry(ctx context.Context, entry *filer.Entry) error {
return mc.localStore.InsertEntry(ctx, entry)
}
// doBatchInsertEntries inserts multiple entries using LevelDB's batch write.
// This is more efficient than inserting entries one by one.
func (mc *MetaCache) doBatchInsertEntries(ctx context.Context, entries []*filer.Entry) error {
return mc.leveldbStore.BatchInsertEntries(ctx, entries)
}
func (mc *MetaCache) AtomicUpdateEntryFromFiler(ctx context.Context, oldPath util.FullPath, newEntry *filer.Entry) error {
mc.Lock()
defer mc.Unlock()
entry, err := mc.localStore.FindEntry(ctx, oldPath)
if err != nil && err != filer_pb.ErrNotFound {
glog.Errorf("Metacache: find entry error: %v", err)
return err
}
if entry != nil {
if oldPath != "" {
if newEntry != nil && oldPath == newEntry.FullPath {
// skip the unnecessary deletion
// leave the update to the following InsertEntry operation
} else {
ctx = context.WithValue(ctx, "OP", "MV")
glog.V(3).Infof("DeleteEntry %s", oldPath)
if err := mc.localStore.DeleteEntry(ctx, oldPath); err != nil {
return err
}
}
}
} else {
// println("unknown old directory:", oldDir)
}
if newEntry != nil {
newDir, _ := newEntry.DirAndName()
if mc.isCachedFn(util.FullPath(newDir)) {
glog.V(3).Infof("InsertEntry %s/%s", newDir, newEntry.Name())
if err := mc.localStore.InsertEntry(ctx, newEntry); err != nil {
return err
}
}
}
return nil
}
func (mc *MetaCache) UpdateEntry(ctx context.Context, entry *filer.Entry) error {
mc.Lock()
defer mc.Unlock()
return mc.localStore.UpdateEntry(ctx, entry)
}
func (mc *MetaCache) FindEntry(ctx context.Context, fp util.FullPath) (entry *filer.Entry, err error) {
mc.RLock()
defer mc.RUnlock()
entry, err = mc.localStore.FindEntry(ctx, fp)
if err != nil {
return nil, err
}
if entry.TtlSec > 0 && entry.Crtime.Add(time.Duration(entry.TtlSec)*time.Second).Before(time.Now()) {
return nil, filer_pb.ErrNotFound
}
mc.mapIdFromFilerToLocal(entry)
return
}
func (mc *MetaCache) DeleteEntry(ctx context.Context, fp util.FullPath) (err error) {
mc.Lock()
defer mc.Unlock()
return mc.localStore.DeleteEntry(ctx, fp)
}
func (mc *MetaCache) DeleteFolderChildren(ctx context.Context, fp util.FullPath) (err error) {
mc.Lock()
defer mc.Unlock()
return mc.localStore.DeleteFolderChildren(ctx, fp)
}
func (mc *MetaCache) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) error {
mc.RLock()
defer mc.RUnlock()
if !mc.isCachedFn(dirPath) {
// if this request comes after renaming, it should be fine
glog.Warningf("unsynchronized dir: %v", dirPath)
}
_, err := mc.localStore.ListDirectoryEntries(ctx, dirPath, startFileName, includeStartFile, limit, func(entry *filer.Entry) (bool, error) {
if entry.TtlSec > 0 && entry.Crtime.Add(time.Duration(entry.TtlSec)*time.Second).Before(time.Now()) {
return true, nil
}
mc.mapIdFromFilerToLocal(entry)
return eachEntryFunc(entry)
})
if err != nil {
return err
}
return err
}
func (mc *MetaCache) Shutdown() {
mc.Lock()
defer mc.Unlock()
mc.localStore.Shutdown()
}
func (mc *MetaCache) mapIdFromFilerToLocal(entry *filer.Entry) {
entry.Attr.Uid, entry.Attr.Gid = mc.uidGidMapper.FilerToLocal(entry.Attr.Uid, entry.Attr.Gid)
}
func (mc *MetaCache) Debug() {
if debuggable, ok := mc.localStore.(filer.Debuggable); ok {
println("start debugging")
debuggable.Debug(os.Stderr)
}
}
|
