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package eth
import (
"bytes"
"container/list"
"math"
"math/big"
"sync"
"time"
"github.com/ethereum/eth-go/ethchain"
"github.com/ethereum/eth-go/ethlog"
"github.com/ethereum/eth-go/ethutil"
)
var poollogger = ethlog.NewLogger("BPOOL")
type block struct {
from *Peer
peer *Peer
block *ethchain.Block
reqAt time.Time
requested int
}
type BlockPool struct {
mut sync.Mutex
eth *Ethereum
hashPool [][]byte
pool map[string]*block
td *big.Int
quit chan bool
fetchingHashes bool
downloadStartedAt time.Time
ChainLength, BlocksProcessed int
}
func NewBlockPool(eth *Ethereum) *BlockPool {
return &BlockPool{
eth: eth,
pool: make(map[string]*block),
td: ethutil.Big0,
quit: make(chan bool),
}
}
func (self *BlockPool) Len() int {
return len(self.hashPool)
}
func (self *BlockPool) HasLatestHash() bool {
self.mut.Lock()
defer self.mut.Unlock()
return self.pool[string(self.eth.BlockChain().CurrentBlock.Hash())] != nil
}
func (self *BlockPool) HasCommonHash(hash []byte) bool {
return self.eth.BlockChain().GetBlock(hash) != nil
}
func (self *BlockPool) Blocks() (blocks ethchain.Blocks) {
for _, item := range self.pool {
if item.block != nil {
blocks = append(blocks, item.block)
}
}
return
}
func (self *BlockPool) AddHash(hash []byte, peer *Peer) {
self.mut.Lock()
defer self.mut.Unlock()
if self.pool[string(hash)] == nil {
self.pool[string(hash)] = &block{peer, nil, nil, time.Now(), 0}
self.hashPool = append([][]byte{hash}, self.hashPool...)
}
}
func (self *BlockPool) Add(b *ethchain.Block, peer *Peer) {
self.mut.Lock()
defer self.mut.Unlock()
hash := string(b.Hash())
if self.pool[hash] == nil && !self.eth.BlockChain().HasBlock(b.Hash()) {
poollogger.Infof("Got unrequested block (%x...)\n", hash[0:4])
self.hashPool = append(self.hashPool, b.Hash())
self.pool[hash] = &block{peer, peer, b, time.Now(), 0}
if !self.eth.BlockChain().HasBlock(b.PrevHash) && !self.fetchingHashes {
//poollogger.Infof("Unknown block, requesting parent (%x...)\n", b.PrevHash[0:4])
//peer.QueueMessage(ethwire.NewMessage(ethwire.MsgGetBlockHashesTy, []interface{}{b.PrevHash, uint32(256)}))
}
} else if self.pool[hash] != nil {
self.pool[hash].block = b
}
self.BlocksProcessed++
}
func (self *BlockPool) Remove(hash []byte) {
self.mut.Lock()
defer self.mut.Unlock()
self.hashPool = ethutil.DeleteFromByteSlice(self.hashPool, hash)
delete(self.pool, string(hash))
}
func (self *BlockPool) ProcessCanonical(f func(block *ethchain.Block)) (procAmount int) {
blocks := self.Blocks()
ethchain.BlockBy(ethchain.Number).Sort(blocks)
for _, block := range blocks {
if self.eth.BlockChain().HasBlock(block.PrevHash) {
procAmount++
f(block)
self.Remove(block.Hash())
}
}
return
}
func (self *BlockPool) DistributeHashes() {
self.mut.Lock()
defer self.mut.Unlock()
var (
peerLen = self.eth.peers.Len()
amount = 256 * peerLen
dist = make(map[*Peer][][]byte)
)
num := int(math.Min(float64(amount), float64(len(self.pool))))
for i, j := 0, 0; i < len(self.hashPool) && j < num; i++ {
hash := self.hashPool[i]
item := self.pool[string(hash)]
if item != nil && item.block == nil {
var peer *Peer
lastFetchFailed := time.Since(item.reqAt) > 5*time.Second
// Handle failed requests
if lastFetchFailed && item.requested > 5 && item.peer != nil {
if item.requested < 100 {
// Select peer the hash was retrieved off
peer = item.from
} else {
// Remove it
self.hashPool = ethutil.DeleteFromByteSlice(self.hashPool, hash)
delete(self.pool, string(hash))
}
} else if lastFetchFailed || item.peer == nil {
// Find a suitable, available peer
eachPeer(self.eth.peers, func(p *Peer, v *list.Element) {
if peer == nil && len(dist[p]) < amount/peerLen {
peer = p
}
})
}
if peer != nil {
item.reqAt = time.Now()
item.peer = peer
item.requested++
dist[peer] = append(dist[peer], hash)
}
}
}
for peer, hashes := range dist {
peer.FetchBlocks(hashes)
}
if len(dist) > 0 {
self.downloadStartedAt = time.Now()
}
}
func (self *BlockPool) Start() {
go self.downloadThread()
go self.chainThread()
}
func (self *BlockPool) Stop() {
close(self.quit)
}
func (self *BlockPool) downloadThread() {
serviceTimer := time.NewTicker(100 * time.Millisecond)
out:
for {
select {
case <-self.quit:
break out
case <-serviceTimer.C:
// Check if we're catching up. If not distribute the hashes to
// the peers and download the blockchain
self.fetchingHashes = false
eachPeer(self.eth.peers, func(p *Peer, v *list.Element) {
if p.statusKnown && p.FetchingHashes() {
self.fetchingHashes = true
}
})
if !self.fetchingHashes && len(self.hashPool) > 0 {
self.DistributeHashes()
}
if self.ChainLength < len(self.hashPool) {
self.ChainLength = len(self.hashPool)
}
}
}
}
func (self *BlockPool) chainThread() {
procTimer := time.NewTicker(500 * time.Millisecond)
out:
for {
select {
case <-self.quit:
break out
case <-procTimer.C:
blocks := self.Blocks()
ethchain.BlockBy(ethchain.Number).Sort(blocks)
if len(blocks) > 0 {
if self.eth.BlockChain().HasBlock(blocks[0].PrevHash) {
for i, block := range blocks[1:] {
// NOTE: The Ith element in this loop refers to the previous block in
// outer "blocks"
if bytes.Compare(block.PrevHash, blocks[i].Hash()) != 0 {
blocks = blocks[:i]
break
}
}
} else {
blocks = nil
}
}
// Handle in batches of 4k
max := int(math.Min(4000, float64(len(blocks))))
for _, block := range blocks[:max] {
self.eth.Eventer().Post("block", block)
self.Remove(block.Hash())
}
}
}
}
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