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67 lines
1.9 KiB
67 lines
1.9 KiB
10 years ago
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package stratum
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import (
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"bytes"
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"encoding/binary"
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"encoding/hex"
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"log"
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"sync/atomic"
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"../../cnutil"
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)
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type BlockTemplate struct {
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Blob string
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Difficulty int64
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Height int64
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ReservedOffset int
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PrevHash string
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Buffer []byte
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ExtraNonce uint32
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}
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func (b *BlockTemplate) nextBlob() (string, uint32) {
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// Preventing race by using atomic op here
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// No need for using locks, because this is only one write to BT and it's atomic
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extraNonce := atomic.AddUint32(&b.ExtraNonce, 1)
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extraBuff := new(bytes.Buffer)
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binary.Write(extraBuff, binary.BigEndian, extraNonce)
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blobBuff := make([]byte, len(b.Buffer))
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copy(blobBuff, b.Buffer) // We never write to this buffer to prevent race
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copy(blobBuff[b.ReservedOffset:], extraBuff.Bytes())
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blob := cnutil.ConvertBlob(blobBuff)
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return hex.EncodeToString(blob), extraNonce
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}
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func (s *StratumServer) fetchBlockTemplate() bool {
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reply, err := s.rpc.GetBlockTemplate(8, s.config.Address)
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if err != nil {
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log.Printf("Error while refreshing block template: %s", err)
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return false
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}
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t := s.currentBlockTemplate()
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if t.PrevHash == reply.PrevHash {
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// Fallback to height comparison
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if len(reply.PrevHash) == 0 && reply.Height > t.Height {
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log.Printf("New block to mine at height %v, diff: %v", reply.Height, reply.Difficulty)
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} else {
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return false
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}
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} else {
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log.Printf("New block to mine at height %v, diff: %v, prev_hash: %s", reply.Height, reply.Difficulty, reply.PrevHash)
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}
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newTemplate := BlockTemplate{
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Blob: reply.Blob,
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Difficulty: reply.Difficulty,
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Height: reply.Height,
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PrevHash: reply.PrevHash,
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ReservedOffset: reply.ReservedOffset,
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}
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newTemplate.Buffer, _ = hex.DecodeString(reply.Blob)
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copy(newTemplate.Buffer[reply.ReservedOffset+4:reply.ReservedOffset+7], s.instanceId)
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newTemplate.ExtraNonce = 0
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s.blockTemplate.Store(&newTemplate)
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return true
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}
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