package storage import ( "bytes" "encoding/binary" "sort" "github.com/CityOfZion/neo-go/pkg/util" ) // Version will attempt to get the current version stored in the // underlying Store. func Version(s Store) (string, error) { version, err := s.Get(SYSVersion.Bytes()) return string(version), err } // PutVersion will store the given version in the underlying Store. func PutVersion(s Store, v string) error { return s.Put(SYSVersion.Bytes(), []byte(v)) } // CurrentBlockHeight returns the current block height found in the // underlying Store. func CurrentBlockHeight(s Store) (uint32, error) { b, err := s.Get(SYSCurrentBlock.Bytes()) if err != nil { return 0, err } return binary.LittleEndian.Uint32(b[32:36]), nil } // CurrentHeaderHeight returns the current header height and hash from // the underlying Store. func CurrentHeaderHeight(s Store) (i uint32, h util.Uint256, err error) { var b []byte b, err = s.Get(SYSCurrentHeader.Bytes()) if err != nil { return } i = binary.LittleEndian.Uint32(b[32:36]) h, err = util.Uint256DecodeReverseBytes(b[:32]) return } // uint32Slice attaches the methods of Interface to []int, sorting in increasing order. type uint32Slice []uint32 func (p uint32Slice) Len() int { return len(p) } func (p uint32Slice) Less(i, j int) bool { return p[i] < p[j] } func (p uint32Slice) Swap(i, j int) { p[i], p[j] = p[j], p[i] } // HeaderHashes returns a sorted list of header hashes retrieved from // the given underlying Store. func HeaderHashes(s Store) ([]util.Uint256, error) { hashMap := make(map[uint32][]util.Uint256) s.Seek(IXHeaderHashList.Bytes(), func(k, v []byte) { storedCount := binary.LittleEndian.Uint32(k[1:]) hashes, err := read2000Uint256Hashes(v) if err != nil { panic(err) } hashMap[storedCount] = hashes }) var ( hashes = make([]util.Uint256, 0, len(hashMap)) sortedKeys = make([]uint32, 0, len(hashMap)) ) for k := range hashMap { sortedKeys = append(sortedKeys, k) } sort.Sort(uint32Slice(sortedKeys)) for _, key := range sortedKeys { hashes = append(hashes[:key], hashMap[key]...) } return hashes, nil } // read2000Uint256Hashes attempts to read 2000 Uint256 hashes from // the given byte array. func read2000Uint256Hashes(b []byte) ([]util.Uint256, error) { r := bytes.NewReader(b) br := util.BinReader{R: r} lenHashes := br.ReadVarUint() hashes := make([]util.Uint256, lenHashes) br.ReadLE(hashes) if br.Err != nil { return nil, br.Err } return hashes, nil }