Kevacoin stratum server for solo-mining
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package stratum
import (
"bytes"
"encoding/binary"
"encoding/hex"
"log"
"sync"
"sync/atomic"
"time"
"../../cnutil"
"../../hashing"
"../util"
)
type Job struct {
sync.RWMutex
id string
extraNonce uint32
height int64
difficulty int64
submissions map[string]struct{}
}
type Miner struct {
sync.RWMutex
id string
ip string
lastBeat int64
startedAt int64
validShares uint64
invalidShares uint64
staleShares uint64
accepts uint64
rejects uint64
shares map[int64]int64
}
func (job *Job) submit(nonce string) bool {
job.Lock()
defer job.Unlock()
if _, exist := job.submissions[nonce]; exist {
return true
}
job.submissions[nonce] = struct{}{}
return false
}
func NewMiner(id string, ip string) *Miner {
shares := make(map[int64]int64)
return &Miner{id: id, ip: ip, shares: shares}
}
func (cs *Session) getJob(t *BlockTemplate) *JobReplyData {
height := atomic.SwapInt64(&cs.lastBlockHeight, t.height)
if height == t.height {
return &JobReplyData{}
}
extraNonce := atomic.AddUint32(&cs.endpoint.extraNonce, 1)
blob := t.nextBlob(extraNonce, cs.endpoint.instanceId)
job := &Job{id: util.Random(), extraNonce: extraNonce, height: t.height, difficulty: cs.difficulty}
job.submissions = make(map[string]struct{})
cs.pushJob(job)
reply := &JobReplyData{JobId: job.id, Blob: blob, Target: cs.targetHex}
return reply
}
func (cs *Session) pushJob(job *Job) {
cs.Lock()
defer cs.Unlock()
cs.validJobs = append(cs.validJobs, job)
if len(cs.validJobs) > 4 {
cs.validJobs = cs.validJobs[1:]
}
}
func (cs *Session) findJob(id string) *Job {
cs.Lock()
defer cs.Unlock()
for _, job := range cs.validJobs {
if job.id == id {
return job
}
}
return nil
}
func (m *Miner) heartbeat() {
now := util.MakeTimestamp()
atomic.StoreInt64(&m.lastBeat, now)
}
func (m *Miner) getLastBeat() int64 {
return atomic.LoadInt64(&m.lastBeat)
}
func (m *Miner) storeShare(diff int64) {
now := util.MakeTimestamp() / 1000
m.Lock()
m.shares[now] += diff
m.Unlock()
}
func (m *Miner) hashrate(estimationWindow time.Duration) float64 {
now := util.MakeTimestamp() / 1000
totalShares := int64(0)
window := int64(estimationWindow / time.Second)
boundary := now - m.startedAt
if boundary > window {
boundary = window
}
m.Lock()
for k, v := range m.shares {
if k < now-86400 {
delete(m.shares, k)
} else if k >= now-window {
totalShares += v
}
}
m.Unlock()
return float64(totalShares) / float64(boundary)
}
func (m *Miner) processShare(s *StratumServer, e *Endpoint, job *Job, t *BlockTemplate, nonce string, result string) bool {
r := s.rpc()
shareBuff := make([]byte, len(t.buffer))
copy(shareBuff, t.buffer)
copy(shareBuff[t.reservedOffset+4:t.reservedOffset+7], e.instanceId)
extraBuff := new(bytes.Buffer)
binary.Write(extraBuff, binary.BigEndian, job.extraNonce)
copy(shareBuff[t.reservedOffset:], extraBuff.Bytes())
nonceBuff, _ := hex.DecodeString(nonce)
copy(shareBuff[39:], nonceBuff)
var hashBytes, convertedBlob []byte
if s.config.BypassShareValidation {
hashBytes, _ = hex.DecodeString(result)
} else {
convertedBlob = cnutil.ConvertBlob(shareBuff)
hashBytes = hashing.Hash(convertedBlob, false)
}
if !s.config.BypassShareValidation && hex.EncodeToString(hashBytes) != result {
log.Printf("Bad hash from miner %v@%v", m.id, m.ip)
atomic.AddUint64(&m.invalidShares, 1)
return false
}
hashDiff := util.GetHashDifficulty(hashBytes).Int64() // FIXME: Will return max int64 value if overflows
atomic.AddInt64(&s.roundShares, e.config.Difficulty)
atomic.AddUint64(&m.validShares, 1)
m.storeShare(e.config.Difficulty)
block := hashDiff >= t.difficulty
if block {
_, err := r.SubmitBlock(hex.EncodeToString(shareBuff))
if err != nil {
atomic.AddUint64(&m.rejects, 1)
atomic.AddUint64(&r.Rejects, 1)
log.Printf("Block submission failure at height %v: %v", t.height, err)
} else {
if len(convertedBlob) == 0 {
convertedBlob = cnutil.ConvertBlob(shareBuff)
}
blockFastHash := hex.EncodeToString(hashing.FastHash(convertedBlob))
// Immediately refresh current BT and send new jobs
s.refreshBlockTemplate(true)
atomic.AddUint64(&m.accepts, 1)
atomic.AddUint64(&r.Accepts, 1)
atomic.StoreInt64(&r.LastSubmissionAt, util.MakeTimestamp())
log.Printf("Block %v found at height %v by miner %v@%v", blockFastHash[0:6], t.height, m.id, m.ip)
}
} else if hashDiff < job.difficulty {
log.Printf("Rejected low difficulty share of %v from %v@%v", hashDiff, m.id, m.ip)
atomic.AddUint64(&m.invalidShares, 1)
return false
}
log.Printf("Valid share at difficulty %v/%v", e.config.Difficulty, hashDiff)
return true
}