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package types
import (
"bytes"
"errors"
"fmt"
"io"
"sync"
"github.com/tendermint/tendermint/crypto/merkle"
"github.com/tendermint/tendermint/libs/bits"
tmbytes "github.com/tendermint/tendermint/libs/bytes"
tmjson "github.com/tendermint/tendermint/libs/json"
tmmath "github.com/tendermint/tendermint/libs/math"
tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
)
var (
ErrPartSetUnexpectedIndex = errors.New("error part set unexpected index")
ErrPartSetInvalidProof = errors.New("error part set invalid proof")
)
type Part struct {
Index uint32 `json:"index"`
Bytes tmbytes.HexBytes `json:"bytes"`
Proof merkle.Proof `json:"proof"`
}
// ValidateBasic performs basic validation.
func (part *Part) ValidateBasic() error {
if len(part.Bytes) > int(BlockPartSizeBytes) {
return fmt.Errorf("too big: %d bytes, max: %d", len(part.Bytes), BlockPartSizeBytes)
}
if err := part.Proof.ValidateBasic(); err != nil {
return fmt.Errorf("wrong Proof: %w", err)
}
return nil
}
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, tmbytes.Fingerprint(part.Bytes),
indent, part.Proof.StringIndented(indent+" "),
indent)
}
func (part *Part) ToProto() (*tmproto.Part, error) {
if part == nil {
return nil, errors.New("nil part")
}
pb := new(tmproto.Part)
proof := part.Proof.ToProto()
pb.Index = part.Index
pb.Bytes = part.Bytes
pb.Proof = *proof
return pb, nil
}
func PartFromProto(pb *tmproto.Part) (*Part, error) {
if pb == nil {
return nil, errors.New("nil part")
}
part := new(Part)
proof, err := merkle.ProofFromProto(&pb.Proof)
if err != nil {
return nil, err
}
part.Index = pb.Index
part.Bytes = pb.Bytes
part.Proof = *proof
return part, part.ValidateBasic()
}
//-------------------------------------
type PartSetHeader struct {
Total uint32 `json:"total"`
Hash tmbytes.HexBytes `json:"hash"`
}
func (psh PartSetHeader) String() string {
return fmt.Sprintf("%v:%X", psh.Total, tmbytes.Fingerprint(psh.Hash))
}
func (psh PartSetHeader) IsZero() bool {
return psh.Total == 0 && len(psh.Hash) == 0
}
func (psh PartSetHeader) Equals(other PartSetHeader) bool {
return psh.Total == other.Total && bytes.Equal(psh.Hash, other.Hash)
}
// ValidateBasic performs basic validation.
func (psh PartSetHeader) ValidateBasic() error {
// Hash can be empty in case of POLBlockID.PartSetHeader in Proposal.
if err := ValidateHash(psh.Hash); err != nil {
return fmt.Errorf("wrong Hash: %w", err)
}
return nil
}
// ToProto converts BloPartSetHeaderckID to protobuf
func (psh *PartSetHeader) ToProto() tmproto.PartSetHeader {
if psh == nil {
return tmproto.PartSetHeader{}
}
return tmproto.PartSetHeader{
Total: psh.Total,
Hash: psh.Hash,
}
}
// FromProto sets a protobuf PartSetHeader to the given pointer
func PartSetHeaderFromProto(ppsh *tmproto.PartSetHeader) (*PartSetHeader, error) {
if ppsh == nil {
return nil, errors.New("nil PartSetHeader")
}
psh := new(PartSetHeader)
psh.Total = ppsh.Total
psh.Hash = ppsh.Hash
return psh, psh.ValidateBasic()
}
//-------------------------------------
type PartSet struct {
total uint32
hash []byte
mtx sync.Mutex
parts []*Part
partsBitArray *bits.BitArray
count uint32
}
// Returns an immutable, full PartSet from the data bytes.
// The data bytes are split into "partSize" chunks, and merkle tree computed.
// CONTRACT: partSize is greater than zero.
func NewPartSetFromData(data []byte, partSize uint32) *PartSet {
// divide data into 4kb parts.
total := (uint32(len(data)) + partSize - 1) / partSize
parts := make([]*Part, total)
partsBytes := make([][]byte, total)
partsBitArray := bits.NewBitArray(int(total))
for i := uint32(0); i < total; i++ {
part := &Part{
Index: i,
Bytes: data[i*partSize : tmmath.MinInt(len(data), int((i+1)*partSize))],
}
parts[i] = part
partsBytes[i] = part.Bytes
partsBitArray.SetIndex(int(i), true)
}
// Compute merkle proofs
root, proofs := merkle.ProofsFromByteSlices(partsBytes)
for i := uint32(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: bits.NewBitArray(int(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() *bits.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() uint32 {
if ps == nil {
return 0
}
return ps.count
}
func (ps *PartSet) Total() uint32 {
if ps == nil {
return 0
}
return ps.total
}
func (ps *PartSet) AddPart(part *Part) (bool, error) {
if ps == nil {
return false, nil
}
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 part.Proof.Verify(ps.Hash(), part.Bytes) != nil {
return false, ErrPartSetInvalidProof
}
// Add part
ps.parts[part.Index] = part
ps.partsBitArray.SetIndex(int(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() {
panic("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
}
ps.mtx.Lock()
defer ps.mtx.Unlock()
return tmjson.Marshal(struct {
CountTotal string `json:"count/total"`
PartsBitArray *bits.BitArray `json:"parts_bit_array"`
}{
fmt.Sprintf("%d/%d", ps.Count(), ps.Total()),
ps.partsBitArray,
})
}