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247 lines
4.8 KiB
247 lines
4.8 KiB
package types
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import (
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"bytes"
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"crypto/sha256"
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"errors"
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"fmt"
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"io"
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"strings"
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"sync"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/merkle"
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)
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const (
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partSize = 4096 // 4KB
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)
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var (
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ErrPartSetUnexpectedIndex = errors.New("Error part set unexpected index")
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ErrPartSetInvalidTrail = errors.New("Error part set invalid trail")
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)
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type Part struct {
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Index uint
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Trail [][]byte
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Bytes []byte
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// Cache
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hash []byte
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}
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func (part *Part) Hash() []byte {
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if part.hash != nil {
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return part.hash
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} else {
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hasher := sha256.New()
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_, err := hasher.Write(part.Bytes)
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if err != nil {
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panic(err)
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}
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part.hash = hasher.Sum(nil)
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return part.hash
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}
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}
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func (part *Part) String() string {
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return part.StringIndented("")
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}
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func (part *Part) StringIndented(indent string) string {
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trailStrings := make([]string, len(part.Trail))
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for i, hash := range part.Trail {
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trailStrings[i] = fmt.Sprintf("%X", hash)
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}
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return fmt.Sprintf(`Part{
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%s Index: %v
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%s Trail:
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%s %v
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%s}`,
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indent, part.Index,
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indent,
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indent, strings.Join(trailStrings, "\n"+indent+" "),
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indent)
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}
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//-------------------------------------
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type PartSetHeader struct {
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Total uint
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Hash []byte
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}
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func (psh PartSetHeader) String() string {
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return fmt.Sprintf("PartSet{T:%v %X}", psh.Total, Fingerprint(psh.Hash))
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}
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func (psh PartSetHeader) IsZero() bool {
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return psh.Total == 0
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}
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func (psh PartSetHeader) Equals(other PartSetHeader) bool {
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return psh.Total == other.Total && bytes.Equal(psh.Hash, other.Hash)
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}
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//-------------------------------------
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type PartSet struct {
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total uint
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hash []byte
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mtx sync.Mutex
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parts []*Part
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partsBitArray BitArray
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count uint
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}
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// Returns an immutable, full PartSet from the data bytes.
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// The data bytes are split into "partSize" chunks, and merkle tree computed.
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func NewPartSetFromData(data []byte) *PartSet {
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// divide data into 4kb parts.
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total := (len(data) + partSize - 1) / partSize
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parts := make([]*Part, total)
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parts_ := make([]merkle.Hashable, total)
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partsBitArray := NewBitArray(uint(total))
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for i := 0; i < total; i++ {
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part := &Part{
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Index: uint(i),
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Bytes: data[i*partSize : MinInt(len(data), (i+1)*partSize)],
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}
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parts[i] = part
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parts_[i] = part
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partsBitArray.SetIndex(uint(i), true)
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}
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// Compute merkle trails
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trails, rootTrail := merkle.HashTrailsFromHashables(parts_)
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for i := 0; i < total; i++ {
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parts[i].Trail = trails[i].Flatten()
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}
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return &PartSet{
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total: uint(total),
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hash: rootTrail.Hash,
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parts: parts,
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partsBitArray: partsBitArray,
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count: uint(total),
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}
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}
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// Returns an empty PartSet ready to be populated.
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func NewPartSetFromHeader(header PartSetHeader) *PartSet {
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return &PartSet{
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total: header.Total,
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hash: header.Hash,
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parts: make([]*Part, header.Total),
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partsBitArray: NewBitArray(uint(header.Total)),
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count: 0,
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}
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}
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func (ps *PartSet) Header() PartSetHeader {
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if ps == nil {
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return PartSetHeader{}
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} else {
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return PartSetHeader{
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Total: ps.total,
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Hash: ps.hash,
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}
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}
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}
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func (ps *PartSet) HasHeader(header PartSetHeader) bool {
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if ps == nil {
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return false
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} else {
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return ps.Header().Equals(header)
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}
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}
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func (ps *PartSet) BitArray() BitArray {
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ps.mtx.Lock()
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defer ps.mtx.Unlock()
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return ps.partsBitArray.Copy()
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}
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func (ps *PartSet) Hash() []byte {
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if ps == nil {
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return nil
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}
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return ps.hash
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}
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func (ps *PartSet) HashesTo(hash []byte) bool {
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if ps == nil {
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return false
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}
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return bytes.Equal(ps.hash, hash)
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}
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func (ps *PartSet) Count() uint {
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if ps == nil {
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return 0
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}
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return ps.count
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}
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func (ps *PartSet) Total() uint {
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if ps == nil {
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return 0
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}
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return ps.total
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}
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func (ps *PartSet) AddPart(part *Part) (bool, error) {
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ps.mtx.Lock()
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defer ps.mtx.Unlock()
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// Invalid part index
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if part.Index >= ps.total {
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return false, ErrPartSetUnexpectedIndex
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}
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// If part already exists, return false.
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if ps.parts[part.Index] != nil {
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return false, nil
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}
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// Check hash trail
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if !merkle.VerifyHashTrail(uint(part.Index), uint(ps.total), part.Hash(), part.Trail, ps.hash) {
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return false, ErrPartSetInvalidTrail
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}
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// Add part
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ps.parts[part.Index] = part
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ps.partsBitArray.SetIndex(uint(part.Index), true)
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ps.count++
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return true, nil
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}
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func (ps *PartSet) GetPart(index uint) *Part {
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ps.mtx.Lock()
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defer ps.mtx.Unlock()
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return ps.parts[index]
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}
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func (ps *PartSet) IsComplete() bool {
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return ps.count == ps.total
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}
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func (ps *PartSet) GetReader() io.Reader {
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if !ps.IsComplete() {
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panic("Cannot GetReader() on incomplete PartSet")
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}
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buf := []byte{}
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for _, part := range ps.parts {
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buf = append(buf, part.Bytes...)
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}
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return bytes.NewReader(buf)
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}
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func (ps *PartSet) StringShort() string {
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if ps == nil {
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return "nil-PartSet"
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} else {
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return fmt.Sprintf("(%v of %v)", ps.Count(), ps.Total())
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}
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}
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