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  1. package types
  2. import (
  3. "bytes"
  4. "errors"
  5. "fmt"
  6. "io"
  7. "sync"
  8. "github.com/tendermint/tendermint/crypto/merkle"
  9. "github.com/tendermint/tendermint/crypto/tmhash"
  10. cmn "github.com/tendermint/tendermint/libs/common"
  11. )
  12. var (
  13. ErrPartSetUnexpectedIndex = errors.New("Error part set unexpected index")
  14. ErrPartSetInvalidProof = errors.New("Error part set invalid proof")
  15. )
  16. type Part struct {
  17. Index int `json:"index"`
  18. Bytes cmn.HexBytes `json:"bytes"`
  19. Proof merkle.SimpleProof `json:"proof"`
  20. // Cache
  21. hash []byte
  22. }
  23. func (part *Part) Hash() []byte {
  24. if part.hash != nil {
  25. return part.hash
  26. }
  27. hasher := tmhash.New()
  28. hasher.Write(part.Bytes) // nolint: errcheck, gas
  29. part.hash = hasher.Sum(nil)
  30. return part.hash
  31. }
  32. func (part *Part) String() string {
  33. return part.StringIndented("")
  34. }
  35. func (part *Part) StringIndented(indent string) string {
  36. return fmt.Sprintf(`Part{#%v
  37. %s Bytes: %X...
  38. %s Proof: %v
  39. %s}`,
  40. part.Index,
  41. indent, cmn.Fingerprint(part.Bytes),
  42. indent, part.Proof.StringIndented(indent+" "),
  43. indent)
  44. }
  45. //-------------------------------------
  46. type PartSetHeader struct {
  47. Total int `json:"total"`
  48. Hash cmn.HexBytes `json:"hash"`
  49. }
  50. func (psh PartSetHeader) String() string {
  51. return fmt.Sprintf("%v:%X", psh.Total, cmn.Fingerprint(psh.Hash))
  52. }
  53. func (psh PartSetHeader) IsZero() bool {
  54. return psh.Total == 0
  55. }
  56. func (psh PartSetHeader) Equals(other PartSetHeader) bool {
  57. return psh.Total == other.Total && bytes.Equal(psh.Hash, other.Hash)
  58. }
  59. //-------------------------------------
  60. type PartSet struct {
  61. total int
  62. hash []byte
  63. mtx sync.Mutex
  64. parts []*Part
  65. partsBitArray *cmn.BitArray
  66. count int
  67. }
  68. // Returns an immutable, full PartSet from the data bytes.
  69. // The data bytes are split into "partSize" chunks, and merkle tree computed.
  70. func NewPartSetFromData(data []byte, partSize int) *PartSet {
  71. // divide data into 4kb parts.
  72. total := (len(data) + partSize - 1) / partSize
  73. parts := make([]*Part, total)
  74. parts_ := make([]merkle.Hasher, total)
  75. partsBitArray := cmn.NewBitArray(total)
  76. for i := 0; i < total; i++ {
  77. part := &Part{
  78. Index: i,
  79. Bytes: data[i*partSize : cmn.MinInt(len(data), (i+1)*partSize)],
  80. }
  81. parts[i] = part
  82. parts_[i] = part
  83. partsBitArray.SetIndex(i, true)
  84. }
  85. // Compute merkle proofs
  86. root, proofs := merkle.SimpleProofsFromHashers(parts_)
  87. for i := 0; i < total; i++ {
  88. parts[i].Proof = *proofs[i]
  89. }
  90. return &PartSet{
  91. total: total,
  92. hash: root,
  93. parts: parts,
  94. partsBitArray: partsBitArray,
  95. count: total,
  96. }
  97. }
  98. // Returns an empty PartSet ready to be populated.
  99. func NewPartSetFromHeader(header PartSetHeader) *PartSet {
  100. return &PartSet{
  101. total: header.Total,
  102. hash: header.Hash,
  103. parts: make([]*Part, header.Total),
  104. partsBitArray: cmn.NewBitArray(header.Total),
  105. count: 0,
  106. }
  107. }
  108. func (ps *PartSet) Header() PartSetHeader {
  109. if ps == nil {
  110. return PartSetHeader{}
  111. }
  112. return PartSetHeader{
  113. Total: ps.total,
  114. Hash: ps.hash,
  115. }
  116. }
  117. func (ps *PartSet) HasHeader(header PartSetHeader) bool {
  118. if ps == nil {
  119. return false
  120. }
  121. return ps.Header().Equals(header)
  122. }
  123. func (ps *PartSet) BitArray() *cmn.BitArray {
  124. ps.mtx.Lock()
  125. defer ps.mtx.Unlock()
  126. return ps.partsBitArray.Copy()
  127. }
  128. func (ps *PartSet) Hash() []byte {
  129. if ps == nil {
  130. return nil
  131. }
  132. return ps.hash
  133. }
  134. func (ps *PartSet) HashesTo(hash []byte) bool {
  135. if ps == nil {
  136. return false
  137. }
  138. return bytes.Equal(ps.hash, hash)
  139. }
  140. func (ps *PartSet) Count() int {
  141. if ps == nil {
  142. return 0
  143. }
  144. return ps.count
  145. }
  146. func (ps *PartSet) Total() int {
  147. if ps == nil {
  148. return 0
  149. }
  150. return ps.total
  151. }
  152. func (ps *PartSet) AddPart(part *Part) (bool, error) {
  153. ps.mtx.Lock()
  154. defer ps.mtx.Unlock()
  155. // Invalid part index
  156. if part.Index >= ps.total {
  157. return false, ErrPartSetUnexpectedIndex
  158. }
  159. // If part already exists, return false.
  160. if ps.parts[part.Index] != nil {
  161. return false, nil
  162. }
  163. // Check hash proof
  164. if !part.Proof.Verify(part.Index, ps.total, part.Hash(), ps.Hash()) {
  165. return false, ErrPartSetInvalidProof
  166. }
  167. // Add part
  168. ps.parts[part.Index] = part
  169. ps.partsBitArray.SetIndex(part.Index, true)
  170. ps.count++
  171. return true, nil
  172. }
  173. func (ps *PartSet) GetPart(index int) *Part {
  174. ps.mtx.Lock()
  175. defer ps.mtx.Unlock()
  176. return ps.parts[index]
  177. }
  178. func (ps *PartSet) IsComplete() bool {
  179. return ps.count == ps.total
  180. }
  181. func (ps *PartSet) GetReader() io.Reader {
  182. if !ps.IsComplete() {
  183. cmn.PanicSanity("Cannot GetReader() on incomplete PartSet")
  184. }
  185. return NewPartSetReader(ps.parts)
  186. }
  187. type PartSetReader struct {
  188. i int
  189. parts []*Part
  190. reader *bytes.Reader
  191. }
  192. func NewPartSetReader(parts []*Part) *PartSetReader {
  193. return &PartSetReader{
  194. i: 0,
  195. parts: parts,
  196. reader: bytes.NewReader(parts[0].Bytes),
  197. }
  198. }
  199. func (psr *PartSetReader) Read(p []byte) (n int, err error) {
  200. readerLen := psr.reader.Len()
  201. if readerLen >= len(p) {
  202. return psr.reader.Read(p)
  203. } else if readerLen > 0 {
  204. n1, err := psr.Read(p[:readerLen])
  205. if err != nil {
  206. return n1, err
  207. }
  208. n2, err := psr.Read(p[readerLen:])
  209. return n1 + n2, err
  210. }
  211. psr.i++
  212. if psr.i >= len(psr.parts) {
  213. return 0, io.EOF
  214. }
  215. psr.reader = bytes.NewReader(psr.parts[psr.i].Bytes)
  216. return psr.Read(p)
  217. }
  218. func (ps *PartSet) StringShort() string {
  219. if ps == nil {
  220. return "nil-PartSet"
  221. }
  222. ps.mtx.Lock()
  223. defer ps.mtx.Unlock()
  224. return fmt.Sprintf("(%v of %v)", ps.Count(), ps.Total())
  225. }
  226. func (ps *PartSet) MarshalJSON() ([]byte, error) {
  227. if ps == nil {
  228. return []byte("{}"), nil
  229. }
  230. ps.mtx.Lock()
  231. defer ps.mtx.Unlock()
  232. return cdc.MarshalJSON(struct {
  233. CountTotal string `json:"count/total"`
  234. PartsBitArray *cmn.BitArray `json:"parts_bit_array"`
  235. }{
  236. fmt.Sprintf("%d/%d", ps.Count(), ps.Total()),
  237. ps.partsBitArray,
  238. })
  239. }