You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
585 lines
14 KiB
585 lines
14 KiB
package blockchain
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
cmn "github.com/tendermint/tendermint/libs/common"
|
|
flow "github.com/tendermint/tendermint/libs/flowrate"
|
|
"github.com/tendermint/tendermint/libs/log"
|
|
|
|
"github.com/tendermint/tendermint/p2p"
|
|
"github.com/tendermint/tendermint/types"
|
|
)
|
|
|
|
/*
|
|
eg, L = latency = 0.1s
|
|
P = num peers = 10
|
|
FN = num full nodes
|
|
BS = 1kB block size
|
|
CB = 1 Mbit/s = 128 kB/s
|
|
CB/P = 12.8 kB
|
|
B/S = CB/P/BS = 12.8 blocks/s
|
|
|
|
12.8 * 0.1 = 1.28 blocks on conn
|
|
*/
|
|
|
|
const (
|
|
requestIntervalMS = 2
|
|
maxTotalRequesters = 600
|
|
maxPendingRequests = maxTotalRequesters
|
|
maxPendingRequestsPerPeer = 20
|
|
|
|
// Minimum recv rate to ensure we're receiving blocks from a peer fast
|
|
// enough. If a peer is not sending us data at at least that rate, we
|
|
// consider them to have timedout and we disconnect.
|
|
//
|
|
// Assuming a DSL connection (not a good choice) 128 Kbps (upload) ~ 15 KB/s,
|
|
// sending data across atlantic ~ 7.5 KB/s.
|
|
minRecvRate = 7680
|
|
|
|
// Maximum difference between current and new block's height.
|
|
maxDiffBetweenCurrentAndReceivedBlockHeight = 100
|
|
)
|
|
|
|
var peerTimeout = 15 * time.Second // not const so we can override with tests
|
|
|
|
/*
|
|
Peers self report their heights when we join the block pool.
|
|
Starting from our latest pool.height, we request blocks
|
|
in sequence from peers that reported higher heights than ours.
|
|
Every so often we ask peers what height they're on so we can keep going.
|
|
|
|
Requests are continuously made for blocks of higher heights until
|
|
the limit is reached. If most of the requests have no available peers, and we
|
|
are not at peer limits, we can probably switch to consensus reactor
|
|
*/
|
|
|
|
type BlockPool struct {
|
|
cmn.BaseService
|
|
startTime time.Time
|
|
|
|
mtx sync.Mutex
|
|
// block requests
|
|
requesters map[int64]*bpRequester
|
|
height int64 // the lowest key in requesters.
|
|
// peers
|
|
peers map[p2p.ID]*bpPeer
|
|
maxPeerHeight int64
|
|
|
|
// atomic
|
|
numPending int32 // number of requests pending assignment or block response
|
|
|
|
requestsCh chan<- BlockRequest
|
|
errorsCh chan<- peerError
|
|
}
|
|
|
|
func NewBlockPool(start int64, requestsCh chan<- BlockRequest, errorsCh chan<- peerError) *BlockPool {
|
|
bp := &BlockPool{
|
|
peers: make(map[p2p.ID]*bpPeer),
|
|
|
|
requesters: make(map[int64]*bpRequester),
|
|
height: start,
|
|
numPending: 0,
|
|
|
|
requestsCh: requestsCh,
|
|
errorsCh: errorsCh,
|
|
}
|
|
bp.BaseService = *cmn.NewBaseService(nil, "BlockPool", bp)
|
|
return bp
|
|
}
|
|
|
|
func (pool *BlockPool) OnStart() error {
|
|
go pool.makeRequestersRoutine()
|
|
pool.startTime = time.Now()
|
|
return nil
|
|
}
|
|
|
|
func (pool *BlockPool) OnStop() {}
|
|
|
|
// Run spawns requesters as needed.
|
|
func (pool *BlockPool) makeRequestersRoutine() {
|
|
for {
|
|
if !pool.IsRunning() {
|
|
break
|
|
}
|
|
|
|
_, numPending, lenRequesters := pool.GetStatus()
|
|
if numPending >= maxPendingRequests {
|
|
// sleep for a bit.
|
|
time.Sleep(requestIntervalMS * time.Millisecond)
|
|
// check for timed out peers
|
|
pool.removeTimedoutPeers()
|
|
} else if lenRequesters >= maxTotalRequesters {
|
|
// sleep for a bit.
|
|
time.Sleep(requestIntervalMS * time.Millisecond)
|
|
// check for timed out peers
|
|
pool.removeTimedoutPeers()
|
|
} else {
|
|
// request for more blocks.
|
|
pool.makeNextRequester()
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pool *BlockPool) removeTimedoutPeers() {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
for _, peer := range pool.peers {
|
|
if !peer.didTimeout && peer.numPending > 0 {
|
|
curRate := peer.recvMonitor.Status().CurRate
|
|
// curRate can be 0 on start
|
|
if curRate != 0 && curRate < minRecvRate {
|
|
err := errors.New("peer is not sending us data fast enough")
|
|
pool.sendError(err, peer.id)
|
|
pool.Logger.Error("SendTimeout", "peer", peer.id,
|
|
"reason", err,
|
|
"curRate", fmt.Sprintf("%d KB/s", curRate/1024),
|
|
"minRate", fmt.Sprintf("%d KB/s", minRecvRate/1024))
|
|
peer.didTimeout = true
|
|
}
|
|
}
|
|
if peer.didTimeout {
|
|
pool.removePeer(peer.id)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pool *BlockPool) GetStatus() (height int64, numPending int32, lenRequesters int) {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
return pool.height, atomic.LoadInt32(&pool.numPending), len(pool.requesters)
|
|
}
|
|
|
|
// TODO: relax conditions, prevent abuse.
|
|
func (pool *BlockPool) IsCaughtUp() bool {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
// Need at least 1 peer to be considered caught up.
|
|
if len(pool.peers) == 0 {
|
|
pool.Logger.Debug("Blockpool has no peers")
|
|
return false
|
|
}
|
|
|
|
// some conditions to determine if we're caught up
|
|
receivedBlockOrTimedOut := (pool.height > 0 || time.Since(pool.startTime) > 5*time.Second)
|
|
ourChainIsLongestAmongPeers := pool.maxPeerHeight == 0 || pool.height >= pool.maxPeerHeight
|
|
isCaughtUp := receivedBlockOrTimedOut && ourChainIsLongestAmongPeers
|
|
return isCaughtUp
|
|
}
|
|
|
|
// We need to see the second block's Commit to validate the first block.
|
|
// So we peek two blocks at a time.
|
|
// The caller will verify the commit.
|
|
func (pool *BlockPool) PeekTwoBlocks() (first *types.Block, second *types.Block) {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
if r := pool.requesters[pool.height]; r != nil {
|
|
first = r.getBlock()
|
|
}
|
|
if r := pool.requesters[pool.height+1]; r != nil {
|
|
second = r.getBlock()
|
|
}
|
|
return
|
|
}
|
|
|
|
// Pop the first block at pool.height
|
|
// It must have been validated by 'second'.Commit from PeekTwoBlocks().
|
|
func (pool *BlockPool) PopRequest() {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
if r := pool.requesters[pool.height]; r != nil {
|
|
/* The block can disappear at any time, due to removePeer().
|
|
if r := pool.requesters[pool.height]; r == nil || r.block == nil {
|
|
PanicSanity("PopRequest() requires a valid block")
|
|
}
|
|
*/
|
|
r.Stop()
|
|
delete(pool.requesters, pool.height)
|
|
pool.height++
|
|
} else {
|
|
panic(fmt.Sprintf("Expected requester to pop, got nothing at height %v", pool.height))
|
|
}
|
|
}
|
|
|
|
// Invalidates the block at pool.height,
|
|
// Remove the peer and redo request from others.
|
|
// Returns the ID of the removed peer.
|
|
func (pool *BlockPool) RedoRequest(height int64) p2p.ID {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
request := pool.requesters[height]
|
|
peerID := request.getPeerID()
|
|
if peerID != p2p.ID("") {
|
|
// RemovePeer will redo all requesters associated with this peer.
|
|
pool.removePeer(peerID)
|
|
}
|
|
return peerID
|
|
}
|
|
|
|
// TODO: ensure that blocks come in order for each peer.
|
|
func (pool *BlockPool) AddBlock(peerID p2p.ID, block *types.Block, blockSize int) {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
requester := pool.requesters[block.Height]
|
|
if requester == nil {
|
|
pool.Logger.Info("peer sent us a block we didn't expect", "peer", peerID, "curHeight", pool.height, "blockHeight", block.Height)
|
|
diff := pool.height - block.Height
|
|
if diff < 0 {
|
|
diff *= -1
|
|
}
|
|
if diff > maxDiffBetweenCurrentAndReceivedBlockHeight {
|
|
pool.sendError(errors.New("peer sent us a block we didn't expect with a height too far ahead/behind"), peerID)
|
|
}
|
|
return
|
|
}
|
|
|
|
if requester.setBlock(block, peerID) {
|
|
atomic.AddInt32(&pool.numPending, -1)
|
|
peer := pool.peers[peerID]
|
|
if peer != nil {
|
|
peer.decrPending(blockSize)
|
|
}
|
|
} else {
|
|
// Bad peer?
|
|
}
|
|
}
|
|
|
|
// MaxPeerHeight returns the highest height reported by a peer.
|
|
func (pool *BlockPool) MaxPeerHeight() int64 {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
return pool.maxPeerHeight
|
|
}
|
|
|
|
// Sets the peer's alleged blockchain height.
|
|
func (pool *BlockPool) SetPeerHeight(peerID p2p.ID, height int64) {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
peer := pool.peers[peerID]
|
|
if peer != nil {
|
|
peer.height = height
|
|
} else {
|
|
peer = newBPPeer(pool, peerID, height)
|
|
peer.setLogger(pool.Logger.With("peer", peerID))
|
|
pool.peers[peerID] = peer
|
|
}
|
|
|
|
if height > pool.maxPeerHeight {
|
|
pool.maxPeerHeight = height
|
|
}
|
|
}
|
|
|
|
func (pool *BlockPool) RemovePeer(peerID p2p.ID) {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
pool.removePeer(peerID)
|
|
}
|
|
|
|
func (pool *BlockPool) removePeer(peerID p2p.ID) {
|
|
for _, requester := range pool.requesters {
|
|
if requester.getPeerID() == peerID {
|
|
requester.redo()
|
|
}
|
|
}
|
|
delete(pool.peers, peerID)
|
|
}
|
|
|
|
// Pick an available peer with at least the given minHeight.
|
|
// If no peers are available, returns nil.
|
|
func (pool *BlockPool) pickIncrAvailablePeer(minHeight int64) *bpPeer {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
for _, peer := range pool.peers {
|
|
if peer.didTimeout {
|
|
pool.removePeer(peer.id)
|
|
continue
|
|
}
|
|
if peer.numPending >= maxPendingRequestsPerPeer {
|
|
continue
|
|
}
|
|
if peer.height < minHeight {
|
|
continue
|
|
}
|
|
peer.incrPending()
|
|
return peer
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (pool *BlockPool) makeNextRequester() {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
nextHeight := pool.height + pool.requestersLen()
|
|
request := newBPRequester(pool, nextHeight)
|
|
// request.SetLogger(pool.Logger.With("height", nextHeight))
|
|
|
|
pool.requesters[nextHeight] = request
|
|
atomic.AddInt32(&pool.numPending, 1)
|
|
|
|
err := request.Start()
|
|
if err != nil {
|
|
request.Logger.Error("Error starting request", "err", err)
|
|
}
|
|
}
|
|
|
|
func (pool *BlockPool) requestersLen() int64 {
|
|
return int64(len(pool.requesters))
|
|
}
|
|
|
|
func (pool *BlockPool) sendRequest(height int64, peerID p2p.ID) {
|
|
if !pool.IsRunning() {
|
|
return
|
|
}
|
|
pool.requestsCh <- BlockRequest{height, peerID}
|
|
}
|
|
|
|
func (pool *BlockPool) sendError(err error, peerID p2p.ID) {
|
|
if !pool.IsRunning() {
|
|
return
|
|
}
|
|
pool.errorsCh <- peerError{err, peerID}
|
|
}
|
|
|
|
// unused by tendermint; left for debugging purposes
|
|
func (pool *BlockPool) debug() string {
|
|
pool.mtx.Lock()
|
|
defer pool.mtx.Unlock()
|
|
|
|
str := ""
|
|
nextHeight := pool.height + pool.requestersLen()
|
|
for h := pool.height; h < nextHeight; h++ {
|
|
if pool.requesters[h] == nil {
|
|
str += fmt.Sprintf("H(%v):X ", h)
|
|
} else {
|
|
str += fmt.Sprintf("H(%v):", h)
|
|
str += fmt.Sprintf("B?(%v) ", pool.requesters[h].block != nil)
|
|
}
|
|
}
|
|
return str
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type bpPeer struct {
|
|
pool *BlockPool
|
|
id p2p.ID
|
|
recvMonitor *flow.Monitor
|
|
|
|
height int64
|
|
numPending int32
|
|
timeout *time.Timer
|
|
didTimeout bool
|
|
|
|
logger log.Logger
|
|
}
|
|
|
|
func newBPPeer(pool *BlockPool, peerID p2p.ID, height int64) *bpPeer {
|
|
peer := &bpPeer{
|
|
pool: pool,
|
|
id: peerID,
|
|
height: height,
|
|
numPending: 0,
|
|
logger: log.NewNopLogger(),
|
|
}
|
|
return peer
|
|
}
|
|
|
|
func (peer *bpPeer) setLogger(l log.Logger) {
|
|
peer.logger = l
|
|
}
|
|
|
|
func (peer *bpPeer) resetMonitor() {
|
|
peer.recvMonitor = flow.New(time.Second, time.Second*40)
|
|
initialValue := float64(minRecvRate) * math.E
|
|
peer.recvMonitor.SetREMA(initialValue)
|
|
}
|
|
|
|
func (peer *bpPeer) resetTimeout() {
|
|
if peer.timeout == nil {
|
|
peer.timeout = time.AfterFunc(peerTimeout, peer.onTimeout)
|
|
} else {
|
|
peer.timeout.Reset(peerTimeout)
|
|
}
|
|
}
|
|
|
|
func (peer *bpPeer) incrPending() {
|
|
if peer.numPending == 0 {
|
|
peer.resetMonitor()
|
|
peer.resetTimeout()
|
|
}
|
|
peer.numPending++
|
|
}
|
|
|
|
func (peer *bpPeer) decrPending(recvSize int) {
|
|
peer.numPending--
|
|
if peer.numPending == 0 {
|
|
peer.timeout.Stop()
|
|
} else {
|
|
peer.recvMonitor.Update(recvSize)
|
|
peer.resetTimeout()
|
|
}
|
|
}
|
|
|
|
func (peer *bpPeer) onTimeout() {
|
|
peer.pool.mtx.Lock()
|
|
defer peer.pool.mtx.Unlock()
|
|
|
|
err := errors.New("peer did not send us anything")
|
|
peer.pool.sendError(err, peer.id)
|
|
peer.logger.Error("SendTimeout", "reason", err, "timeout", peerTimeout)
|
|
peer.didTimeout = true
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type bpRequester struct {
|
|
cmn.BaseService
|
|
pool *BlockPool
|
|
height int64
|
|
gotBlockCh chan struct{}
|
|
redoCh chan struct{}
|
|
|
|
mtx sync.Mutex
|
|
peerID p2p.ID
|
|
block *types.Block
|
|
}
|
|
|
|
func newBPRequester(pool *BlockPool, height int64) *bpRequester {
|
|
bpr := &bpRequester{
|
|
pool: pool,
|
|
height: height,
|
|
gotBlockCh: make(chan struct{}, 1),
|
|
redoCh: make(chan struct{}, 1),
|
|
|
|
peerID: "",
|
|
block: nil,
|
|
}
|
|
bpr.BaseService = *cmn.NewBaseService(nil, "bpRequester", bpr)
|
|
return bpr
|
|
}
|
|
|
|
func (bpr *bpRequester) OnStart() error {
|
|
go bpr.requestRoutine()
|
|
return nil
|
|
}
|
|
|
|
// Returns true if the peer matches and block doesn't already exist.
|
|
func (bpr *bpRequester) setBlock(block *types.Block, peerID p2p.ID) bool {
|
|
bpr.mtx.Lock()
|
|
if bpr.block != nil || bpr.peerID != peerID {
|
|
bpr.mtx.Unlock()
|
|
return false
|
|
}
|
|
bpr.block = block
|
|
bpr.mtx.Unlock()
|
|
|
|
select {
|
|
case bpr.gotBlockCh <- struct{}{}:
|
|
default:
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (bpr *bpRequester) getBlock() *types.Block {
|
|
bpr.mtx.Lock()
|
|
defer bpr.mtx.Unlock()
|
|
return bpr.block
|
|
}
|
|
|
|
func (bpr *bpRequester) getPeerID() p2p.ID {
|
|
bpr.mtx.Lock()
|
|
defer bpr.mtx.Unlock()
|
|
return bpr.peerID
|
|
}
|
|
|
|
// This is called from the requestRoutine, upon redo().
|
|
func (bpr *bpRequester) reset() {
|
|
bpr.mtx.Lock()
|
|
defer bpr.mtx.Unlock()
|
|
|
|
if bpr.block != nil {
|
|
atomic.AddInt32(&bpr.pool.numPending, 1)
|
|
}
|
|
|
|
bpr.peerID = ""
|
|
bpr.block = nil
|
|
}
|
|
|
|
// Tells bpRequester to pick another peer and try again.
|
|
// NOTE: Nonblocking, and does nothing if another redo
|
|
// was already requested.
|
|
func (bpr *bpRequester) redo() {
|
|
select {
|
|
case bpr.redoCh <- struct{}{}:
|
|
default:
|
|
}
|
|
}
|
|
|
|
// Responsible for making more requests as necessary
|
|
// Returns only when a block is found (e.g. AddBlock() is called)
|
|
func (bpr *bpRequester) requestRoutine() {
|
|
OUTER_LOOP:
|
|
for {
|
|
// Pick a peer to send request to.
|
|
var peer *bpPeer
|
|
PICK_PEER_LOOP:
|
|
for {
|
|
if !bpr.IsRunning() || !bpr.pool.IsRunning() {
|
|
return
|
|
}
|
|
peer = bpr.pool.pickIncrAvailablePeer(bpr.height)
|
|
if peer == nil {
|
|
//log.Info("No peers available", "height", height)
|
|
time.Sleep(requestIntervalMS * time.Millisecond)
|
|
continue PICK_PEER_LOOP
|
|
}
|
|
break PICK_PEER_LOOP
|
|
}
|
|
bpr.mtx.Lock()
|
|
bpr.peerID = peer.id
|
|
bpr.mtx.Unlock()
|
|
|
|
// Send request and wait.
|
|
bpr.pool.sendRequest(bpr.height, peer.id)
|
|
WAIT_LOOP:
|
|
for {
|
|
select {
|
|
case <-bpr.pool.Quit():
|
|
bpr.Stop()
|
|
return
|
|
case <-bpr.Quit():
|
|
return
|
|
case <-bpr.redoCh:
|
|
bpr.reset()
|
|
continue OUTER_LOOP
|
|
case <-bpr.gotBlockCh:
|
|
// We got a block!
|
|
// Continue the for-loop and wait til Quit.
|
|
continue WAIT_LOOP
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type BlockRequest struct {
|
|
Height int64
|
|
PeerID p2p.ID
|
|
}
|