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perf improvements to CalculatePOC (#182)

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Sharding: proof of custody performance improvements
Former-commit-id: 6a41b5031298579c78d848277fbdff77de27b5f3 [formerly 31a818a367d311f8c7021b9a6b5cad986e53baf3]
Former-commit-id: 2c992bf3b2c98573db021f46680a48ccc632f25b
This commit is contained in:
Yutaro Mori 2018-06-18 23:06:02 +09:00 committed by terence tsao
parent f32f7ba36c
commit ad291e93f6
2 changed files with 18 additions and 19 deletions
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23
sharding/collation.go
View File

@ -122,9 +122,11 @@ func (c *Collation) CalculateChunkRoot() {
// some salt, which is appended to each chunk in the collation body before it
// is hashed.
func (c *Collation) CalculatePOC(salt []byte) common.Hash {
body := make([]byte, len(c.body))
body := make([]byte, 0, len(c.body)*(1+len(salt)))
// TODO: Use 32 byte chunks instead of a single byte
for _, chunk := range c.body {
body = append(body, append(salt, chunk)...) // add salt to each chunk.
body = append(append(body, salt...), chunk)
}
if len(c.body) == 0 {
body = salt
@ -139,23 +141,6 @@ func BytesToChunks(body []byte) Chunks {
return Chunks(body)
}
// ConvertBackToTx converts raw blobs back to their original transactions.
func ConvertBackToTx(rawBlobs []utils.RawBlob) ([]*types.Transaction, error) {
blobs := make([]*types.Transaction, len(rawBlobs))
for i := 0; i < len(rawBlobs); i++ {
blobs[i] = types.NewTransaction(0, common.HexToAddress("0x"), nil, 0, nil, nil)
err := utils.ConvertFromRawBlob(&rawBlobs[i], blobs[i])
if err != nil {
return nil, fmt.Errorf("Creation of transactions from raw blobs failed: %v", err)
}
}
return blobs, nil
}
// convertTxToRawBlob transactions into RawBlobs. This step encodes transactions uses RLP encoding
func convertTxToRawBlob(txs []*types.Transaction) ([]*utils.RawBlob, error) {
blobs := make([]*utils.RawBlob, len(txs))

14
sharding/collation_test.go
View File

@ -308,3 +308,17 @@ func BenchmarkSerializeRoundtrip100(b *testing.B) {
func BenchmarkSerializeRoundtrip1000(b *testing.B) {
runSerializeRoundtrip(b, 1000)
}
func BenchmarkCalculatePOC(b *testing.B) {
body := make([]byte, 300)
rand.Read(body)
collation := NewCollation(&CollationHeader{}, body, nil)
salt := make([]byte, 20)
rand.Read(salt)
for i := 0; i < b.N; i++ {
collation.CalculatePOC(salt)
}
}