You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
283 lines
5.7 KiB
283 lines
5.7 KiB
package types
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"sync"
|
|
|
|
"golang.org/x/crypto/ripemd160"
|
|
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
"github.com/tendermint/tmlibs/merkle"
|
|
)
|
|
|
|
var (
|
|
ErrPartSetUnexpectedIndex = errors.New("Error part set unexpected index")
|
|
ErrPartSetInvalidProof = errors.New("Error part set invalid proof")
|
|
)
|
|
|
|
type Part struct {
|
|
Index int `json:"index"`
|
|
Bytes cmn.HexBytes `json:"bytes"`
|
|
Proof merkle.SimpleProof `json:"proof"`
|
|
|
|
// Cache
|
|
hash []byte
|
|
}
|
|
|
|
func (part *Part) Hash() []byte {
|
|
if part.hash != nil {
|
|
return part.hash
|
|
}
|
|
hasher := ripemd160.New()
|
|
hasher.Write(part.Bytes) // nolint: errcheck, gas
|
|
part.hash = hasher.Sum(nil)
|
|
return part.hash
|
|
}
|
|
|
|
func (part *Part) String() string {
|
|
return part.StringIndented("")
|
|
}
|
|
|
|
func (part *Part) StringIndented(indent string) string {
|
|
return fmt.Sprintf(`Part{#%v
|
|
%s Bytes: %X...
|
|
%s Proof: %v
|
|
%s}`,
|
|
part.Index,
|
|
indent, cmn.Fingerprint(part.Bytes),
|
|
indent, part.Proof.StringIndented(indent+" "),
|
|
indent)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type PartSetHeader struct {
|
|
Total int `json:"total"`
|
|
Hash cmn.HexBytes `json:"hash"`
|
|
}
|
|
|
|
func (psh PartSetHeader) String() string {
|
|
return fmt.Sprintf("%v:%X", psh.Total, cmn.Fingerprint(psh.Hash))
|
|
}
|
|
|
|
func (psh PartSetHeader) IsZero() bool {
|
|
return psh.Total == 0
|
|
}
|
|
|
|
func (psh PartSetHeader) Equals(other PartSetHeader) bool {
|
|
return psh.Total == other.Total && bytes.Equal(psh.Hash, other.Hash)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type PartSet struct {
|
|
total int
|
|
hash []byte
|
|
|
|
mtx sync.Mutex
|
|
parts []*Part
|
|
partsBitArray *cmn.BitArray
|
|
count int
|
|
}
|
|
|
|
// Returns an immutable, full PartSet from the data bytes.
|
|
// The data bytes are split into "partSize" chunks, and merkle tree computed.
|
|
func NewPartSetFromData(data []byte, partSize int) *PartSet {
|
|
// divide data into 4kb parts.
|
|
total := (len(data) + partSize - 1) / partSize
|
|
parts := make([]*Part, total)
|
|
parts_ := make([]merkle.Hasher, total)
|
|
partsBitArray := cmn.NewBitArray(total)
|
|
for i := 0; i < total; i++ {
|
|
part := &Part{
|
|
Index: i,
|
|
Bytes: data[i*partSize : cmn.MinInt(len(data), (i+1)*partSize)],
|
|
}
|
|
parts[i] = part
|
|
parts_[i] = part
|
|
partsBitArray.SetIndex(i, true)
|
|
}
|
|
// Compute merkle proofs
|
|
root, proofs := merkle.SimpleProofsFromHashers(parts_)
|
|
for i := 0; i < total; i++ {
|
|
parts[i].Proof = *proofs[i]
|
|
}
|
|
return &PartSet{
|
|
total: total,
|
|
hash: root,
|
|
parts: parts,
|
|
partsBitArray: partsBitArray,
|
|
count: total,
|
|
}
|
|
}
|
|
|
|
// Returns an empty PartSet ready to be populated.
|
|
func NewPartSetFromHeader(header PartSetHeader) *PartSet {
|
|
return &PartSet{
|
|
total: header.Total,
|
|
hash: header.Hash,
|
|
parts: make([]*Part, header.Total),
|
|
partsBitArray: cmn.NewBitArray(header.Total),
|
|
count: 0,
|
|
}
|
|
}
|
|
|
|
func (ps *PartSet) Header() PartSetHeader {
|
|
if ps == nil {
|
|
return PartSetHeader{}
|
|
}
|
|
return PartSetHeader{
|
|
Total: ps.total,
|
|
Hash: ps.hash,
|
|
}
|
|
}
|
|
|
|
func (ps *PartSet) HasHeader(header PartSetHeader) bool {
|
|
if ps == nil {
|
|
return false
|
|
}
|
|
return ps.Header().Equals(header)
|
|
}
|
|
|
|
func (ps *PartSet) BitArray() *cmn.BitArray {
|
|
ps.mtx.Lock()
|
|
defer ps.mtx.Unlock()
|
|
return ps.partsBitArray.Copy()
|
|
}
|
|
|
|
func (ps *PartSet) Hash() []byte {
|
|
if ps == nil {
|
|
return nil
|
|
}
|
|
return ps.hash
|
|
}
|
|
|
|
func (ps *PartSet) HashesTo(hash []byte) bool {
|
|
if ps == nil {
|
|
return false
|
|
}
|
|
return bytes.Equal(ps.hash, hash)
|
|
}
|
|
|
|
func (ps *PartSet) Count() int {
|
|
if ps == nil {
|
|
return 0
|
|
}
|
|
return ps.count
|
|
}
|
|
|
|
func (ps *PartSet) Total() int {
|
|
if ps == nil {
|
|
return 0
|
|
}
|
|
return ps.total
|
|
}
|
|
|
|
func (ps *PartSet) AddPart(part *Part, verify bool) (bool, error) {
|
|
ps.mtx.Lock()
|
|
defer ps.mtx.Unlock()
|
|
|
|
// Invalid part index
|
|
if part.Index >= ps.total {
|
|
return false, ErrPartSetUnexpectedIndex
|
|
}
|
|
|
|
// If part already exists, return false.
|
|
if ps.parts[part.Index] != nil {
|
|
return false, nil
|
|
}
|
|
|
|
// Check hash proof
|
|
if verify {
|
|
if !part.Proof.Verify(part.Index, ps.total, part.Hash(), ps.Hash()) {
|
|
return false, ErrPartSetInvalidProof
|
|
}
|
|
}
|
|
|
|
// Add part
|
|
ps.parts[part.Index] = part
|
|
ps.partsBitArray.SetIndex(part.Index, true)
|
|
ps.count++
|
|
return true, nil
|
|
}
|
|
|
|
func (ps *PartSet) GetPart(index int) *Part {
|
|
ps.mtx.Lock()
|
|
defer ps.mtx.Unlock()
|
|
return ps.parts[index]
|
|
}
|
|
|
|
func (ps *PartSet) IsComplete() bool {
|
|
return ps.count == ps.total
|
|
}
|
|
|
|
func (ps *PartSet) GetReader() io.Reader {
|
|
if !ps.IsComplete() {
|
|
cmn.PanicSanity("Cannot GetReader() on incomplete PartSet")
|
|
}
|
|
return NewPartSetReader(ps.parts)
|
|
}
|
|
|
|
type PartSetReader struct {
|
|
i int
|
|
parts []*Part
|
|
reader *bytes.Reader
|
|
}
|
|
|
|
func NewPartSetReader(parts []*Part) *PartSetReader {
|
|
return &PartSetReader{
|
|
i: 0,
|
|
parts: parts,
|
|
reader: bytes.NewReader(parts[0].Bytes),
|
|
}
|
|
}
|
|
|
|
func (psr *PartSetReader) Read(p []byte) (n int, err error) {
|
|
readerLen := psr.reader.Len()
|
|
if readerLen >= len(p) {
|
|
return psr.reader.Read(p)
|
|
} else if readerLen > 0 {
|
|
n1, err := psr.Read(p[:readerLen])
|
|
if err != nil {
|
|
return n1, err
|
|
}
|
|
n2, err := psr.Read(p[readerLen:])
|
|
return n1 + n2, err
|
|
}
|
|
|
|
psr.i++
|
|
if psr.i >= len(psr.parts) {
|
|
return 0, io.EOF
|
|
}
|
|
psr.reader = bytes.NewReader(psr.parts[psr.i].Bytes)
|
|
return psr.Read(p)
|
|
}
|
|
|
|
func (ps *PartSet) StringShort() string {
|
|
if ps == nil {
|
|
return "nil-PartSet"
|
|
}
|
|
ps.mtx.Lock()
|
|
defer ps.mtx.Unlock()
|
|
return fmt.Sprintf("(%v of %v)", ps.Count(), ps.Total())
|
|
}
|
|
|
|
func (ps *PartSet) MarshalJSON() ([]byte, error) {
|
|
if ps == nil {
|
|
return []byte("nil-PartSet"), nil
|
|
}
|
|
|
|
ps.mtx.Lock()
|
|
defer ps.mtx.Unlock()
|
|
|
|
return cdc.MarshalJSON(struct {
|
|
CountTotal string `json:"count/total"`
|
|
PartsBitArray *cmn.BitArray `json:"parts_bit_array"`
|
|
}{
|
|
fmt.Sprintf("%d/%d", ps.Count(), ps.Total()),
|
|
ps.partsBitArray.Copy(),
|
|
})
|
|
}
|