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244 lines
4.9 KiB
244 lines
4.9 KiB
package types
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"sync"
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"code.google.com/p/go.crypto/ripemd160"
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. "github.com/tendermint/go-common"
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"github.com/tendermint/go-merkle"
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"github.com/tendermint/go-wire"
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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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ErrPartSetInvalidProof = errors.New("Error part set invalid proof")
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)
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type Part struct {
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Index int `json:"index"`
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Bytes []byte `json:"bytes"`
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Proof merkle.SimpleProof `json:"proof"`
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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 := ripemd160.New()
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hasher.Write(part.Bytes) // doesn't err
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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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return fmt.Sprintf(`Part{#%v
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%s Bytes: %X...
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%s Proof: %v
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%s}`,
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part.Index,
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indent, Fingerprint(part.Bytes),
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indent, part.Proof.StringIndented(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 int `json:"total"`
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Hash []byte `json:"hash"`
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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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func (psh PartSetHeader) WriteSignBytes(w io.Writer, n *int, err *error) {
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wire.WriteTo([]byte(Fmt(`{"hash":"%X","total":%v}`, psh.Hash, psh.Total)), w, n, err)
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}
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//-------------------------------------
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type PartSet struct {
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total int
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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 int
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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(total)
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for i := 0; i < total; i++ {
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part := &Part{
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Index: 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(i, true)
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}
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// Compute merkle proofs
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root, proofs := merkle.SimpleProofsFromHashables(parts_)
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for i := 0; i < total; i++ {
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parts[i].Proof = *proofs[i]
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}
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return &PartSet{
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total: total,
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hash: root,
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parts: parts,
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partsBitArray: partsBitArray,
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count: 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(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() int {
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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() int {
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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 proof
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if !part.Proof.Verify(part.Index, ps.total, part.Hash(), ps.Hash()) {
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return false, ErrPartSetInvalidProof
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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(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 int) *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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PanicSanity("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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