func mainCleanUp() {
log.Infof("Cleaning up...")
err := node.Destroy()
if err != nil {
log.Infof("Error destroying node: %s", err.Error())
}
}
func (u *outputDB) Commit(tag uint32, force bool) error {
if force || u.db.WAValueLen() > kaiju.GetConfig().MaxKdbWAValueLen {
log.Infof("Committing blocks up to number %d ...", tag)
err := u.db.Commit(tag)
log.Infof("Committed blocks up to number %d", tag)
return err
}
return nil
}
// Returns *Stats, tag, cursor
func readHeader(s Storage) (*Stats, uint32, int64, error) {
errInvalid := errors.New("Invalid KDB header")
p := make([]byte, HeaderSize)
if _, err := s.Read(p); err != nil {
return nil, 0, 0, err
}
if p[0] != 'K' || p[1] != 'D' || p[2] != 'B' || Version != p[3] {
return nil, 0, 0, errInvalid
}
if SlotSize != p[4] || ValLenUnit != p[5] || HeaderSize != p[6] {
return nil, 0, 0, errInvalid
}
buf := bytes.NewBuffer(p[8:])
stats := new(Stats)
var tag uint32
var cursor int64
binary.Read(buf, binary.LittleEndian, &stats.capacity)
binary.Read(buf, binary.LittleEndian, &stats.records)
binary.Read(buf, binary.LittleEndian, &stats.deadSlots)
binary.Read(buf, binary.LittleEndian, &stats.deadValues)
for i := 0; i < 6; i++ { //reserved space
var n int32
binary.Read(buf, binary.LittleEndian, &n)
}
binary.Read(buf, binary.LittleEndian, &tag)
binary.Read(buf, binary.LittleEndian, &cursor)
if stats.capacity <= 0 {
return nil, 0, 0, errInvalid
} else if cursor < HeaderSize+int64(stats.capacity)*2*SlotSize {
return nil, 0, 0, errInvalid
}
log.Infof("kdb readHeader: capacity %d records %d deadSlots %d deadValues %d tag %d cursor %d",
stats.capacity, stats.records, stats.deadSlots, stats.deadValues, tag, cursor)
return stats, tag, cursor, nil
}
func newSwdl(begin int, end int, paral int, load int) *swdl {
// Open a window that wider than paral * load
maxSlots := (end - begin) / load
slots := paral * 4
if slots > maxSlots {
slots = maxSlots
}
s := slots * load
if slots == 0 {
s = end - begin
}
log.Infof("newSwdl begin %d end %d winsize %d", begin, end, s)
return &swdl{
begin: begin,
end: end,
paral: paral,
load: load,
cursor: begin,
size: s,
window: make([]interface{}, 0),
chout: make(chan map[int]*blockchain.InvElement),
chin: make(chan map[int]interface{}),
chblock: make(chan struct {
btcmsg.Message
I int
}),
done: make(chan struct{}),
ca: newSwdlca(),
}
}
func (db *KDB) Rebuild(capacity uint32, s Storage, was Storage) (*KDB, error) {
newdb, err := New(capacity, s, was)
if err != nil {
return nil, err
}
f := func(i uint32, sd []byte, val []byte, mv bool) error {
n, err := newdb.slotScan(sd[:InternalKeySize], nil, nil)
if err != nil {
return err
}
binary.LittleEndian.PutUint32(sd[InternalKeySize:], newdb.dataLoc())
newdb.writeKey(sd, n)
newdb.writeValue(val, keyData(sd).unitValLen(), mv)
if i%100000 == 0 {
newdb.commit(i)
log.Infof("KDB.Rebuild: current key count:%d", i)
}
return nil
}
db.smutex.RLock()
defer db.smutex.RUnlock()
if _, _, err = db.enumerate(f); err != nil {
return nil, err
}
if tag, err := db.tag(); err != nil {
return nil, err
} else {
newdb.commit(tag)
}
return newdb, nil
}
// Append downloaded headers.
// TODO: more robust way of getting old blocks
func (h *headers) Append(hs []*catma.Header) error {
if len(hs) == 0 {
return nil
}
oldL := len(h.data) - 1 // excluding genesis
for _, header := range hs {
err := h.appendHeader(header)
if err != nil {
return err
}
}
// Write to file as well
f := h.file
// Caclulate the offset
offset := int64(binary.Size(hs[0]) * oldL)
_, err := f.Seek(offset, 0)
if err != nil {
return err
}
for _, header := range hs {
err := binary.Write(f, binary.LittleEndian, header)
if err != nil {
return err
}
}
log.Infof("Headers total: %v", len(h.data))
return f.Sync()
}
// Load block headers saved in file.
// Errors are not returned to caller, simply print a log
func (h *headers) loadHeaders() {
r := h.file
for {
ch := new(catma.Header)
if err := binary.Read(r, binary.LittleEndian, ch); err == nil {
if err = h.appendHeader(ch); err != nil {
log.Infof("Error loading block header: %s", err)
break
}
} else {
if err != io.EOF {
log.Infof("Error reading blcok header file: %s", err)
}
break
}
}
log.Infof("Loaded header count: %v", len(h.data))
}
func (p *addrPool) dump() {
stats := make(map[int32]int32)
for e := p.addrStatusQueue.Front(); e != nil; e = e.Next() {
t := e.Value.(*addrStatus).timesFailed
if c, ok := stats[t]; ok {
stats[t] = c + 1
} else {
stats[t] = 1
}
}
log.Infof("AddrPool Dump %v", stats)
}
func (sw *swdl) start() {
sw.wg.Add(1) // For doSaveBlocks
for i := 0; i < sw.paral; i++ {
go sw.doDownload()
}
go sw.doSaveBlock()
go sw.doSchedule()
sw.chin <- nil // Trigger downloading
sw.wg.Wait()
db := cold.Get().OutputDB()
if err := db.Commit(uint32(sw.end-1), true); err != nil {
log.Panicf("db commit error: %s", err)
}
log.Infof("Finished downloading from %d to %d", sw.begin, sw.end)
}
func moreHeaders() {
headers := cold.Get().Headers()
l := headers.GetLocator()
msg := btcmsg.NewGetHeadersMsg()
mg := msg.(*btcmsg.Message_getheaders)
mg.BlockLocators = l
mg.HashStop = new(klib.Hash256)
f := func(m btcmsg.Message) (bool, bool) {
_, ok := m.(*btcmsg.Message_headers)
return ok, true
}
mh := knet.ParalMsgForMsg(mg, f, 3)
if mh != nil {
h, _ := mh.(*btcmsg.Message_headers)
err := headers.Append(h.Headers)
if err != nil {
log.Infof("Error appending headers: %s", err)
}
}
}
func mainFunc() {
c := make(chan struct{})
log.Infof("Starting KNet...")
ch, err := knet.Start(10)
if err != nil {
log.Infof("Error starting knet: %s", err)
}
<-ch
log.Infof("KNet initialized.")
log.Infof("Initializing Node...")
err = node.Init()
if err != nil {
log.Infof("Error initializing Node: %s", err.Error())
return
}
log.Infof("Starting Node...")
node.Start()
log.Infof("Node started.")
// Don't quit
_ = <-c
}
func (sw *swdl) schedule(msgs map[int]interface{}) {
// 1. Fill blanks with downloaded blocks
got := 0
for k, v := range msgs {
i := k - sw.cursor
if _, ok := v.(*btcmsg.Message_block); ok {
got++
}
sw.window[i] = v
}
// 2. Congestion control
if len(msgs) > 0 && sw.ca.update(got, len(msgs)) {
// Send nil for a "NOP" download
sw.sendWork(nil)
return
}
// 3. Slide window and process blocks
dist := len(sw.window) // Slide distance
for i, elem := range sw.window {
if bm, ok := elem.(*btcmsg.Message_block); ok {
//log.Infoln("save block", i + sw.cursor, i, sw.cursor, bm.Header.Hash())
sw.chblock <- struct {
btcmsg.Message
I int
}{bm, i + sw.cursor}
} else {
dist = i
break
}
}
if dist > 0 {
log.Infof("swdl: window slided %d", dist)
}
sw.window = sw.window[dist:]
sw.cursor += dist
l := len(sw.window)
for i := l; i < sw.size; i++ {
p := sw.cursor + i
if p >= sw.end {
break
}
ie := blockchain.GetInvElem(p)
sw.window = append(sw.window, ie)
}
if len(sw.window) == 0 {
close(sw.done) // All blocks downloaded
}
// 4. Handle unfinished work
unfinished := make(map[int]*blockchain.InvElement)
for i, elem := range sw.window {
if ie, ok := elem.(*blockchain.InvElement); ok {
unfinished[sw.cursor+i] = ie
}
}
l = len(unfinished)
if len(msgs) > 0 {
log.Debugf("winsize %d left %d got %d cursor %d health %f", len(sw.window), l, got, sw.cursor, sw.ca.health)
}
if l == 0 { // No blocks left, do nothing
} else if l <= sw.load {
sw.sendWork(unfinished)
} else {
work := make(map[int]*blockchain.InvElement)
for k, v := range unfinished {
work[k] = v
if len(work) >= sw.load {
if !sw.sendWork(work) { // channel is full
break
}
work = make(map[int]*blockchain.InvElement)
}
}
}
}