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415 lines
9.2 KiB
415 lines
9.2 KiB
package blockchain
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import (
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"sync"
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"sync/atomic"
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"time"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/types"
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)
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const (
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maxTries = 3
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inputsChannelCapacity = 200
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requestIntervalMS = 500
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maxPendingRequests = 200
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maxTotalRequests = 300
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maxRequestsPerPeer = 300
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)
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// numTotal = numPending + blocks in the pool we havnt synced yet
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var (
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requestTimeoutSeconds = time.Duration(3)
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)
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/*
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Peers self report their heights when a new peer joins the block pool.
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Starting from whatever we've got (pool.height), we request blocks
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in sequence from peers that reported higher heights than ours.
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Every so often we ask peers what height they're on so we can keep going.
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Requests are continuously made for blocks of heigher heights until
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the limits. If most of the requests have no available peers, and we
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are not at peer limits, we can probably switch to consensus reactor
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*/
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type BlockPool struct {
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// block requests
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requestsMtx sync.Mutex
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requests map[uint]*bpRequest
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peerless int32 // number of requests without peers
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height uint // the lowest key in requests.
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numPending int32
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numTotal int32
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// peers
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peersMtx sync.Mutex
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peers map[string]*bpPeer
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requestsCh chan<- BlockRequest
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timeoutsCh chan<- string
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repeater *RepeatTimer
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running int32 // atomic
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}
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func NewBlockPool(start uint, requestsCh chan<- BlockRequest, timeoutsCh chan<- string) *BlockPool {
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return &BlockPool{
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peers: make(map[string]*bpPeer),
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requests: make(map[uint]*bpRequest),
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height: start,
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numPending: 0,
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numTotal: 0,
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requestsCh: requestsCh,
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timeoutsCh: timeoutsCh,
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repeater: NewRepeatTimer("", requestIntervalMS*time.Millisecond),
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running: 0,
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}
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}
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func (pool *BlockPool) Start() {
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if atomic.CompareAndSwapInt32(&pool.running, 0, 1) {
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log.Info("Starting BlockPool")
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go pool.run()
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}
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}
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func (pool *BlockPool) Stop() {
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if atomic.CompareAndSwapInt32(&pool.running, 1, 0) {
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log.Info("Stopping BlockPool")
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pool.repeater.Stop()
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}
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}
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func (pool *BlockPool) IsRunning() bool {
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return atomic.LoadInt32(&pool.running) == 1
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}
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// Run spawns requests as needed.
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func (pool *BlockPool) run() {
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RUN_LOOP:
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for {
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if atomic.LoadInt32(&pool.running) == 0 {
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break RUN_LOOP
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}
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_, numPending, numTotal := pool.GetStatus()
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if numPending >= maxPendingRequests {
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// sleep for a bit.
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time.Sleep(requestIntervalMS * time.Millisecond)
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} else if numTotal >= maxTotalRequests {
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// sleep for a bit.
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time.Sleep(requestIntervalMS * time.Millisecond)
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} else {
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// request for more blocks.
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height := pool.nextHeight()
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pool.makeRequest(height)
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}
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}
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}
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func (pool *BlockPool) GetStatus() (uint, int32, int32) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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return pool.height, pool.numPending, pool.numTotal
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}
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// We need to see the second block's Validation to validate the first block.
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// So we peek two blocks at a time.
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func (pool *BlockPool) PeekTwoBlocks() (first *types.Block, second *types.Block) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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if r := pool.requests[pool.height]; r != nil {
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first = r.block
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}
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if r := pool.requests[pool.height+1]; r != nil {
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second = r.block
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}
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return
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}
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// Pop the first block at pool.height
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// It must have been validated by 'second'.Validation from PeekTwoBlocks().
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func (pool *BlockPool) PopRequest() {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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if r := pool.requests[pool.height]; r == nil || r.block == nil {
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panic("PopRequest() requires a valid block")
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}
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delete(pool.requests, pool.height)
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pool.height++
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pool.numTotal--
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}
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// Invalidates the block at pool.height.
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// Remove the peer and request from others.
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func (pool *BlockPool) RedoRequest(height uint) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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request := pool.requests[height]
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if request.block == nil {
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panic("Expected block to be non-nil")
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}
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// TODO: record this malfeasance
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// maybe punish peer on switch (an invalid block!)
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pool.RemovePeer(request.peerId) // Lock on peersMtx.
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request.block = nil
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request.peerId = ""
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pool.numPending++
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pool.peerless++
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go requestRoutine(pool, height)
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}
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func (pool *BlockPool) hasBlock(height uint) bool {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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request := pool.requests[height]
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return request != nil && request.block != nil
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}
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func (pool *BlockPool) setPeerForRequest(height uint, peerId string) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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request := pool.requests[height]
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if request == nil {
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return
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}
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pool.peerless--
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request.peerId = peerId
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}
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func (pool *BlockPool) removePeerForRequest(height uint, peerId string) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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request := pool.requests[height]
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if request == nil {
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return
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}
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pool.peerless++
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request.peerId = ""
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}
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func (pool *BlockPool) AddBlock(block *types.Block, peerId string) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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request := pool.requests[block.Height]
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if request == nil {
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return
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}
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if request.peerId != peerId {
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return
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}
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if request.block != nil {
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return
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}
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request.block = block
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pool.numPending--
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}
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func (pool *BlockPool) getPeer(peerId string) *bpPeer {
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pool.peersMtx.Lock() // Lock
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defer pool.peersMtx.Unlock()
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peer := pool.peers[peerId]
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return peer
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}
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// Sets the peer's alleged blockchain height.
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func (pool *BlockPool) SetPeerHeight(peerId string, height uint) {
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pool.peersMtx.Lock() // Lock
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defer pool.peersMtx.Unlock()
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peer := pool.peers[peerId]
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if peer != nil {
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peer.height = height
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} else {
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peer = &bpPeer{
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height: height,
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id: peerId,
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numRequests: 0,
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}
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pool.peers[peerId] = peer
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}
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}
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func (pool *BlockPool) RemovePeer(peerId string) {
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pool.peersMtx.Lock() // Lock
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defer pool.peersMtx.Unlock()
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delete(pool.peers, peerId)
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}
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// Pick an available peer with at least the given minHeight.
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// If no peers are available, returns nil.
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func (pool *BlockPool) pickIncrAvailablePeer(minHeight uint) *bpPeer {
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pool.peersMtx.Lock()
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defer pool.peersMtx.Unlock()
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for _, peer := range pool.peers {
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if peer.numRequests >= maxRequestsPerPeer {
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continue
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}
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if peer.height < minHeight {
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continue
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}
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peer.numRequests++
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return peer
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}
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return nil
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}
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func (pool *BlockPool) decrPeer(peerId string) {
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pool.peersMtx.Lock()
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defer pool.peersMtx.Unlock()
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peer := pool.peers[peerId]
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if peer == nil {
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return
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}
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peer.numRequests--
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}
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func (pool *BlockPool) nextHeight() uint {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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// we make one request per height.
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return pool.height + uint(pool.numTotal)
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}
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func (pool *BlockPool) makeRequest(height uint) {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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request := &bpRequest{
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height: height,
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peerId: "",
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block: nil,
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}
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pool.requests[height] = request
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pool.peerless++
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nextHeight := pool.height + uint(pool.numTotal)
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if nextHeight == height {
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pool.numTotal++
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pool.numPending++
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}
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go requestRoutine(pool, height)
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}
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func (pool *BlockPool) sendRequest(height uint, peerId string) {
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if atomic.LoadInt32(&pool.running) == 0 {
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return
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}
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pool.requestsCh <- BlockRequest{height, peerId}
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}
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func (pool *BlockPool) sendTimeout(peerId string) {
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if atomic.LoadInt32(&pool.running) == 0 {
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return
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}
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pool.timeoutsCh <- peerId
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}
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func (pool *BlockPool) debug() string {
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pool.requestsMtx.Lock() // Lock
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defer pool.requestsMtx.Unlock()
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str := ""
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for h := pool.height; h < pool.height+uint(pool.numTotal); h++ {
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if pool.requests[h] == nil {
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str += Fmt("H(%v):X ", h)
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} else {
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str += Fmt("H(%v):", h)
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str += Fmt("B?(%v) ", pool.requests[h].block != nil)
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}
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}
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return str
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}
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//-------------------------------------
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type bpPeer struct {
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id string
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height uint
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numRequests int32
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}
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type bpRequest struct {
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height uint
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peerId string
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block *types.Block
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}
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//-------------------------------------
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// Responsible for making more requests as necessary
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// Returns only when a block is found (e.g. AddBlock() is called)
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func requestRoutine(pool *BlockPool, height uint) {
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for {
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var peer *bpPeer = nil
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PICK_LOOP:
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for {
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if !pool.IsRunning() {
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log.Debug("BlockPool not running. Stopping requestRoutine", "height", height)
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return
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}
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peer = pool.pickIncrAvailablePeer(height)
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if peer == nil {
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//log.Debug("No peers available", "height", height)
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time.Sleep(requestIntervalMS * time.Millisecond)
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continue PICK_LOOP
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}
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break PICK_LOOP
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}
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// set the peer, decrement peerless
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pool.setPeerForRequest(height, peer.id)
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for try := 0; try < maxTries; try++ {
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pool.sendRequest(height, peer.id)
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time.Sleep(requestTimeoutSeconds * time.Second)
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// if successful the block is either in the pool,
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if pool.hasBlock(height) {
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pool.decrPeer(peer.id)
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return
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}
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// or already processed and we've moved past it
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bpHeight, _, _ := pool.GetStatus()
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if height < bpHeight {
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pool.decrPeer(peer.id)
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return
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}
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}
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// unset the peer, increment peerless
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pool.removePeerForRequest(height, peer.id)
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// this peer failed us, try again
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pool.RemovePeer(peer.id)
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pool.sendTimeout(peer.id)
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}
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}
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//-------------------------------------
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type BlockRequest struct {
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Height uint
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PeerId string
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}
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