Ejemplo n.º 1
0
func levelDbWrite(db *leveldb.DB,
	key uint64, offset uint32, size uint32) error {
	bytes := make([]byte, 16)
	util.Uint64toBytes(bytes[0:8], key)
	util.Uint32toBytes(bytes[8:12], offset)
	util.Uint32toBytes(bytes[12:16], size)
	if err := db.Put(bytes[0:8], bytes[8:16], nil); err != nil {
		return fmt.Errorf("failed to write leveldb: %v", err)
	}
	return nil
}
Ejemplo n.º 2
0
func (nm *baseNeedleMapper) appendToIndexFile(key uint64, offset uint32, size uint32) error {
	bytes := make([]byte, 16)
	util.Uint64toBytes(bytes[0:8], key)
	util.Uint32toBytes(bytes[8:12], offset)
	util.Uint32toBytes(bytes[12:16], size)

	nm.mutex.Lock()
	defer nm.mutex.Unlock()
	if _, err := nm.indexFile.Seek(0, 2); err != nil {
		return fmt.Errorf("cannot seek end of indexfile %s: %v",
			nm.indexFile.Name(), err)
	}
	_, err := nm.indexFile.Write(bytes)
	return err
}
Ejemplo n.º 3
0
func (n *FileId) String() string {
	bytes := make([]byte, 12)
	util.Uint64toBytes(bytes[0:8], n.Key)
	util.Uint32toBytes(bytes[8:12], n.Hashcode)
	nonzero_index := 0
	for ; bytes[nonzero_index] == 0; nonzero_index++ {
	}
	return n.VolumeId.String() + "," + hex.EncodeToString(bytes[nonzero_index:])
}
Ejemplo n.º 4
0
func ToNid(key uint64, cookie uint32) string {
	bytes := make([]byte, 12)
	util.Uint64toBytes(bytes[0:8], key)
	util.Uint32toBytes(bytes[8:12], cookie)
	nonzero_index := 0
	for ; bytes[nonzero_index] == 0; nonzero_index++ {
	}
	return hex.EncodeToString(bytes[nonzero_index:])
}
Ejemplo n.º 5
0
func boltDbWrite(db *bolt.DB,
	key uint64, offset uint32, size uint32) error {
	bytes := make([]byte, 16)
	util.Uint64toBytes(bytes[0:8], key)
	util.Uint32toBytes(bytes[8:12], offset)
	util.Uint32toBytes(bytes[12:16], size)
	return db.Update(func(tx *bolt.Tx) error {
		bucket, err := tx.CreateBucketIfNotExists(boltdbBucket)
		if err != nil {
			return err
		}

		err = bucket.Put(bytes[0:8], bytes[8:16])
		if err != nil {
			return err
		}
		return nil
	})
}
Ejemplo n.º 6
0
func (n *Needle) Etag() string {
	bits := make([]byte, 4)
	util.Uint32toBytes(bits, uint32(n.Checksum))
	return fmt.Sprintf("\"%x\"", bits)
}
Ejemplo n.º 7
0
func (n *Needle) Append(w io.Writer, version Version) (size uint32, err error) {
	if s, ok := w.(io.Seeker); ok {
		if end, e := s.Seek(0, 1); e == nil {
			defer func(s io.Seeker, off int64) {
				if err != nil {
					if _, e = s.Seek(off, 0); e != nil {
						glog.V(0).Infof("Failed to seek %s back to %d with error: %v", w, off, e)
					}
				}
			}(s, end)
		} else {
			err = fmt.Errorf("Cannot Read Current Volume Position: %v", e)
			return
		}
	}
	switch version {
	case Version1:
		header := make([]byte, NeedleHeaderSize)
		util.Uint32toBytes(header[0:4], n.Cookie)
		util.Uint64toBytes(header[4:12], n.Id)
		n.Size = uint32(len(n.Data))
		size = n.Size
		util.Uint32toBytes(header[12:16], n.Size)
		if _, err = w.Write(header); err != nil {
			return
		}
		if _, err = w.Write(n.Data); err != nil {
			return
		}
		padding := NeedlePaddingSize - ((NeedleHeaderSize + n.Size + NeedleChecksumSize) % NeedlePaddingSize)
		util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
		_, err = w.Write(header[0 : NeedleChecksumSize+padding])
		return
	case Version2:
		header := make([]byte, NeedleHeaderSize)
		util.Uint32toBytes(header[0:4], n.Cookie)
		util.Uint64toBytes(header[4:12], n.Id)
		n.DataSize, n.NameSize, n.MimeSize = uint32(len(n.Data)), uint8(len(n.Name)), uint8(len(n.Mime))
		if n.DataSize > 0 {
			n.Size = 4 + n.DataSize + 1
			if n.HasName() {
				n.Size = n.Size + 1 + uint32(n.NameSize)
			}
			if n.HasMime() {
				n.Size = n.Size + 1 + uint32(n.MimeSize)
			}
			if n.HasLastModifiedDate() {
				n.Size = n.Size + LastModifiedBytesLength
			}
			if n.HasTtl() {
				n.Size = n.Size + TtlBytesLength
			}
		} else {
			n.Size = 0
		}
		size = n.DataSize
		util.Uint32toBytes(header[12:16], n.Size)
		if _, err = w.Write(header); err != nil {
			return
		}
		if n.DataSize > 0 {
			util.Uint32toBytes(header[0:4], n.DataSize)
			if _, err = w.Write(header[0:4]); err != nil {
				return
			}
			if _, err = w.Write(n.Data); err != nil {
				return
			}
			util.Uint8toBytes(header[0:1], n.Flags)
			if _, err = w.Write(header[0:1]); err != nil {
				return
			}
			if n.HasName() {
				util.Uint8toBytes(header[0:1], n.NameSize)
				if _, err = w.Write(header[0:1]); err != nil {
					return
				}
				if _, err = w.Write(n.Name); err != nil {
					return
				}
			}
			if n.HasMime() {
				util.Uint8toBytes(header[0:1], n.MimeSize)
				if _, err = w.Write(header[0:1]); err != nil {
					return
				}
				if _, err = w.Write(n.Mime); err != nil {
					return
				}
			}
			if n.HasLastModifiedDate() {
				util.Uint64toBytes(header[0:8], n.LastModified)
				if _, err = w.Write(header[8-LastModifiedBytesLength : 8]); err != nil {
					return
				}
			}
			if n.HasTtl() && n.Ttl != nil {
				n.Ttl.ToBytes(header[0:TtlBytesLength])
				if _, err = w.Write(header[0:TtlBytesLength]); err != nil {
					return
				}
			}
		}
		padding := NeedlePaddingSize - ((NeedleHeaderSize + n.Size + NeedleChecksumSize) % NeedlePaddingSize)
		util.Uint32toBytes(header[0:NeedleChecksumSize], n.Checksum.Value())
		_, err = w.Write(header[0 : NeedleChecksumSize+padding])
		return n.DataSize, err
	}
	return 0, fmt.Errorf("Unsupported Version! (%d)", version)
}
Ejemplo n.º 8
0
func (v *Volume) makeupDiff(newDatFileName, newIdxFileName, oldDatFileName, oldIdxFileName string) (err error) {
	var indexSize int64

	oldIdxFile, err := os.Open(oldIdxFileName)
	defer oldIdxFile.Close()

	oldDatFile, err := os.Open(oldDatFileName)
	defer oldDatFile.Close()

	if indexSize, err = verifyIndexFileIntegrity(oldIdxFile); err != nil {
		return fmt.Errorf("verifyIndexFileIntegrity %s failed: %v", oldIdxFileName, err)
	}
	if indexSize == 0 || uint64(indexSize) <= v.lastCompactIndexOffset {
		return nil
	}

	oldDatCompactRevision, err := fetchCompactRevisionFromDatFile(oldDatFile)
	if err != nil {
		return
	}
	if oldDatCompactRevision != v.lastCompactRevision {
		return fmt.Errorf("current old dat file's compact revision %d is not the expected one %d", oldDatCompactRevision, v.lastCompactRevision)
	}

	type keyField struct {
		offset uint32
		size   uint32
	}
	incrementedHasUpdatedIndexEntry := make(map[uint64]keyField)

	for idx_offset := indexSize - NeedleIndexSize; uint64(idx_offset) >= v.lastCompactIndexOffset; idx_offset -= NeedleIndexSize {
		var IdxEntry []byte
		if IdxEntry, err = readIndexEntryAtOffset(oldIdxFile, idx_offset); err != nil {
			return fmt.Errorf("readIndexEntry %s at offset %d failed: %v", oldIdxFileName, idx_offset, err)
		}
		key, offset, size := idxFileEntry(IdxEntry)
		if _, found := incrementedHasUpdatedIndexEntry[key]; !found {
			incrementedHasUpdatedIndexEntry[key] = keyField{
				offset: offset,
				size:   size,
			}
		}
	}

	if len(incrementedHasUpdatedIndexEntry) > 0 {
		var (
			dst, idx *os.File
		)
		if dst, err = os.OpenFile(newDatFileName, os.O_RDWR, 0644); err != nil {
			return
		}
		defer dst.Close()

		if idx, err = os.OpenFile(newIdxFileName, os.O_RDWR, 0644); err != nil {
			return
		}
		defer idx.Close()

		var newDatCompactRevision uint16
		newDatCompactRevision, err = fetchCompactRevisionFromDatFile(dst)
		if err != nil {
			return
		}
		if oldDatCompactRevision+1 != newDatCompactRevision {
			return fmt.Errorf("oldDatFile %s 's compact revision is %d while newDatFile %s 's compact revision is %d", oldDatFileName, oldDatCompactRevision, newDatFileName, newDatCompactRevision)
		}

		idx_entry_bytes := make([]byte, 16)
		for key, incre_idx_entry := range incrementedHasUpdatedIndexEntry {
			util.Uint64toBytes(idx_entry_bytes[0:8], key)
			util.Uint32toBytes(idx_entry_bytes[8:12], incre_idx_entry.offset)
			util.Uint32toBytes(idx_entry_bytes[12:16], incre_idx_entry.size)

			var offset int64
			if offset, err = dst.Seek(0, 2); err != nil {
				glog.V(0).Infof("failed to seek the end of file: %v", err)
				return
			}
			//ensure file writing starting from aligned positions
			if offset%NeedlePaddingSize != 0 {
				offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
				if offset, err = v.dataFile.Seek(offset, 0); err != nil {
					glog.V(0).Infof("failed to align in datafile %s: %v", v.dataFile.Name(), err)
					return
				}
			}

			//updated needle
			if incre_idx_entry.offset != 0 && incre_idx_entry.size != 0 {
				//even the needle cache in memory is hit, the need_bytes is correct
				var needle_bytes []byte
				needle_bytes, _, err = ReadNeedleBlob(oldDatFile, int64(incre_idx_entry.offset)*NeedlePaddingSize, incre_idx_entry.size)
				if err != nil {
					return
				}
				dst.Write(needle_bytes)
				util.Uint32toBytes(idx_entry_bytes[8:12], uint32(offset/NeedlePaddingSize))
			} else { //deleted needle
				//fakeDelNeedle 's default Data field is nil
				fakeDelNeedle := new(Needle)
				fakeDelNeedle.Id = key
				fakeDelNeedle.Cookie = 0x12345678
				_, err = fakeDelNeedle.Append(dst, v.Version())
				if err != nil {
					return
				}
				util.Uint32toBytes(idx_entry_bytes[8:12], uint32(0))
			}

			if _, err := idx.Seek(0, 2); err != nil {
				return fmt.Errorf("cannot seek end of indexfile %s: %v",
					newIdxFileName, err)
			}
			_, err = idx.Write(idx_entry_bytes)
		}
	}

	return nil
}