package stratum import ( "bytes" "encoding/binary" "encoding/hex" "log" "math/big" "github.com/sammy007/monero-stratum/cnutil" ) type BlockTemplate struct { difficulty *big.Int diffInt64 int64 height int64 reservedOffset int prevHash string buffer []byte } func (b *BlockTemplate) nextBlob(extraNonce uint32, instanceId []byte) string { extraBuff := new(bytes.Buffer) binary.Write(extraBuff, binary.BigEndian, extraNonce) blobBuff := make([]byte, len(b.buffer)) copy(blobBuff, b.buffer) copy(blobBuff[b.reservedOffset+4:b.reservedOffset+7], instanceId) copy(blobBuff[b.reservedOffset:], extraBuff.Bytes()) blob := cnutil.ConvertBlob(blobBuff) return hex.EncodeToString(blob) } func (s *StratumServer) fetchBlockTemplate() bool { r := s.rpc() reply, err := r.GetBlockTemplate(8, s.config.Address) if err != nil { log.Printf("Error while refreshing block template: %s", err) return false } t := s.currentBlockTemplate() if t != nil && t.prevHash == reply.PrevHash { // Fallback to height comparison if len(reply.PrevHash) == 0 && reply.Height > t.height { log.Printf("New block to mine on %s at height %v, diff: %v", r.Name, reply.Height, reply.Difficulty) } else { return false } } else { log.Printf("New block to mine on %s at height %v, diff: %v, prev_hash: %s", r.Name, reply.Height, reply.Difficulty, reply.PrevHash) } newTemplate := BlockTemplate{ diffInt64: reply.Difficulty, difficulty: big.NewInt(reply.Difficulty), height: reply.Height, prevHash: reply.PrevHash, reservedOffset: reply.ReservedOffset, } newTemplate.buffer, _ = hex.DecodeString(reply.Blob) s.blockTemplate.Store(&newTemplate) return true }