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