Golang FileInfo.UnmarshalXDR方法代碼示例

func ldbGet(db *leveldb.DB, repo, node, file []byte) protocol.FileInfo {
	nk := nodeKey(repo, node, file)
	bs, err := db.Get(nk, nil)
	if err == leveldb.ErrNotFound {
		return protocol.FileInfo{}
	}
	if err != nil {
		panic(err)
	}

	var f protocol.FileInfo
	err = f.UnmarshalXDR(bs)
	if err != nil {
		panic(err)
	}
	return f
}

func ldbUpdate(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) uint64 {
	batch := new(leveldb.Batch)
	snap, err := db.GetSnapshot()
	if err != nil {
		panic(err)
	}
	defer snap.Release()

	var maxLocalVer uint64
	for _, f := range fs {
		name := []byte(f.Name)
		fk := nodeKey(repo, node, name)
		bs, err := snap.Get(fk, nil)
		if err == leveldb.ErrNotFound {
			if lv := ldbInsert(batch, repo, node, name, f); lv > maxLocalVer {
				maxLocalVer = lv
			}
			ldbUpdateGlobal(snap, batch, repo, node, name, f.Version)
			continue
		}

		var ef protocol.FileInfo
		err = ef.UnmarshalXDR(bs)
		if err != nil {
			panic(err)
		}
		if ef.Version != f.Version {
			if lv := ldbInsert(batch, repo, node, name, f); lv > maxLocalVer {
				maxLocalVer = lv
			}
			ldbUpdateGlobal(snap, batch, repo, node, name, f.Version)
		}
	}

	err = db.Write(batch, nil)
	if err != nil {
		panic(err)
	}

	return maxLocalVer
}

func ldbReplaceWithDelete(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo) bool {
	return ldbGenericReplace(db, repo, node, fs, func(db dbReader, batch dbWriter, repo, node, name []byte, dbi iterator.Iterator) bool {
		var f protocol.FileInfo
		err := f.UnmarshalXDR(dbi.Value())
		if err != nil {
			panic(err)
		}
		if !protocol.IsDeleted(f.Flags) {
			if debug {
				l.Debugf("mark deleted; repo=%q node=%x name=%q", repo, node, name)
			}
			f.Blocks = nil
			f.Version = lamport.Default.Tick(f.Version)
			f.Flags |= protocol.FlagDeleted
			batch.Put(dbi.Key(), f.MarshalXDR())
			ldbUpdateGlobal(db, batch, repo, node, nodeKeyName(dbi.Key()), f.Version)
			return true
		}
		return false
	})
}

func ldbGetGlobal(db *leveldb.DB, repo, file []byte) protocol.FileInfo {
	k := globalKey(repo, file)
	snap, err := db.GetSnapshot()
	if err != nil {
		panic(err)
	}
	defer snap.Release()

	bs, err := snap.Get(k, nil)
	if err == leveldb.ErrNotFound {
		return protocol.FileInfo{}
	}
	if err != nil {
		panic(err)
	}

	var vl versionList
	err = vl.UnmarshalXDR(bs)
	if err != nil {
		panic(err)
	}
	if len(vl.versions) == 0 {
		l.Debugln(k)
		panic("no versions?")
	}

	k = nodeKey(repo, vl.versions[0].node, file)
	bs, err = snap.Get(k, nil)
	if err != nil {
		panic(err)
	}

	var f protocol.FileInfo
	err = f.UnmarshalXDR(bs)
	if err != nil {
		panic(err)
	}
	return f
}

func ldbWithHave(db *leveldb.DB, repo, node []byte, fn fileIterator) {
	start := nodeKey(repo, node, nil)                            // before all repo/node files
	limit := nodeKey(repo, node, []byte{0xff, 0xff, 0xff, 0xff}) // after all repo/node files
	snap, err := db.GetSnapshot()
	if err != nil {
		panic(err)
	}
	defer snap.Release()
	dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
	defer dbi.Release()

	for dbi.Next() {
		var f protocol.FileInfo
		err := f.UnmarshalXDR(dbi.Value())
		if err != nil {
			panic(err)
		}
		if cont := fn(f); !cont {
			return
		}
	}
}

func ldbWithGlobal(db *leveldb.DB, repo []byte, fn fileIterator) {
	start := globalKey(repo, nil)
	limit := globalKey(repo, []byte{0xff, 0xff, 0xff, 0xff})
	snap, err := db.GetSnapshot()
	if err != nil {
		panic(err)
	}
	defer snap.Release()
	dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
	defer dbi.Release()

	for dbi.Next() {
		var vl versionList
		err := vl.UnmarshalXDR(dbi.Value())
		if err != nil {
			panic(err)
		}
		if len(vl.versions) == 0 {
			l.Debugln(dbi.Key())
			panic("no versions?")
		}
		fk := nodeKey(repo, vl.versions[0].node, globalKeyName(dbi.Key()))
		bs, err := snap.Get(fk, nil)
		if err != nil {
			panic(err)
		}

		var f protocol.FileInfo
		err = f.UnmarshalXDR(bs)
		if err != nil {
			panic(err)
		}

		if cont := fn(f); !cont {
			return
		}
	}
}

func ldbGenericReplace(db *leveldb.DB, repo, node []byte, fs []protocol.FileInfo, deleteFn deletionHandler) bool {
	sort.Sort(fileList(fs)) // sort list on name, same as on disk

	start := nodeKey(repo, node, nil)                            // before all repo/node files
	limit := nodeKey(repo, node, []byte{0xff, 0xff, 0xff, 0xff}) // after all repo/node files

	batch := new(leveldb.Batch)
	snap, err := db.GetSnapshot()
	if err != nil {
		panic(err)
	}
	defer snap.Release()
	dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
	defer dbi.Release()

	moreDb := dbi.Next()
	fsi := 0
	changed := false

	for {
		var newName, oldName []byte
		moreFs := fsi < len(fs)

		if !moreDb && !moreFs {
			break
		}

		if !moreFs && deleteFn == nil {
			// We don't have any more updated files to process and deletion
			// has not been requested, so we can exit early
			break
		}

		if moreFs {
			newName = []byte(fs[fsi].Name)
		}

		if moreDb {
			oldName = nodeKeyName(dbi.Key())
		}

		cmp := bytes.Compare(newName, oldName)

		if debug {
			l.Debugf("generic replace; repo=%q node=%x moreFs=%v moreDb=%v cmp=%d newName=%q oldName=%q", repo, node, moreFs, moreDb, cmp, newName, oldName)
		}

		switch {
		case moreFs && (!moreDb || cmp == -1):
			changed = true
			// Disk is missing this file. Insert it.
			ldbInsert(batch, repo, node, newName, fs[fsi])
			ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
			fsi++

		case cmp == 0:
			// File exists on both sides - compare versions.
			var ef protocol.FileInfo
			ef.UnmarshalXDR(dbi.Value())
			if fs[fsi].Version > ef.Version {
				ldbInsert(batch, repo, node, newName, fs[fsi])
				ldbUpdateGlobal(snap, batch, repo, node, newName, fs[fsi].Version)
				changed = true
			}
			// Iterate both sides.
			fsi++
			moreDb = dbi.Next()

		case moreDb && (!moreFs || cmp == 1):
			if deleteFn != nil {
				if deleteFn(snap, batch, repo, node, oldName, dbi) {
					changed = true
				}
			}
			moreDb = dbi.Next()
		}
	}

	err = db.Write(batch, nil)
	if err != nil {
		panic(err)
	}

	return changed
}

func ldbWithNeed(db *leveldb.DB, repo, node []byte, fn fileIterator) {
	start := globalKey(repo, nil)
	limit := globalKey(repo, []byte{0xff, 0xff, 0xff, 0xff})
	snap, err := db.GetSnapshot()
	if err != nil {
		panic(err)
	}
	defer snap.Release()
	dbi := snap.NewIterator(&util.Range{Start: start, Limit: limit}, nil)
	defer dbi.Release()

	for dbi.Next() {
		var vl versionList
		err := vl.UnmarshalXDR(dbi.Value())
		if err != nil {
			panic(err)
		}
		if len(vl.versions) == 0 {
			l.Debugln(dbi.Key())
			panic("no versions?")
		}

		have := false // If we have the file, any version
		need := false // If we have a lower version of the file
		var haveVersion uint64
		for _, v := range vl.versions {
			if bytes.Compare(v.node, node) == 0 {
				have = true
				haveVersion = v.version
				need = v.version < vl.versions[0].version
				break
			}
		}

		if need || !have {
			name := globalKeyName(dbi.Key())
			if debug {
				l.Debugf("need repo=%q node=%x name=%q need=%v have=%v haveV=%d globalV=%d", repo, node, name, need, have, haveVersion, vl.versions[0].version)
			}
			fk := nodeKey(repo, vl.versions[0].node, name)
			bs, err := snap.Get(fk, nil)
			if err != nil {
				panic(err)
			}

			var gf protocol.FileInfo
			err = gf.UnmarshalXDR(bs)
			if err != nil {
				panic(err)
			}

			if protocol.IsDeleted(gf.Flags) && !have {
				// We don't need deleted files that we don't have
				continue
			}

			if cont := fn(gf); !cont {
				return
			}
		}
	}
}