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package blockchain
import (
"bytes"
"errors"
"fmt"
"reflect"
"sync/atomic"
"time"
"github.com/tendermint/tendermint/binary"
. "github.com/tendermint/tendermint/common"
"github.com/tendermint/tendermint/events"
"github.com/tendermint/tendermint/p2p"
sm "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
const (
BlockchainChannel = byte(0x40)
defaultChannelCapacity = 100
defaultSleepIntervalMS = 500
trySyncIntervalMS = 100
// stop syncing when last block's time is
// within this much of the system time.
// stopSyncingDurationMinutes = 10
// ask for best height every 10s
statusUpdateIntervalSeconds = 10
// check if we should switch to consensus reactor
switchToConsensusIntervalSeconds = 10
)
type consensusReactor interface {
// for when we switch from blockchain reactor and fast sync to
// the consensus machine
SwitchToConsensus(*sm.State)
}
// BlockchainReactor handles long-term catchup syncing.
type BlockchainReactor struct {
sw *p2p.Switch
state *sm.State
store *BlockStore
pool *BlockPool
sync bool
requestsCh chan BlockRequest
timeoutsCh chan string
lastBlock *types.Block
quit chan struct{}
running uint32
evsw events.Fireable
}
func NewBlockchainReactor(state *sm.State, store *BlockStore, sync bool) *BlockchainReactor {
// SANITY CHECK
if state.LastBlockHeight != store.Height() &&
state.LastBlockHeight != store.Height()-1 { // XXX double check this logic.
panic(Fmt("state (%v) and store (%v) height mismatch", state.LastBlockHeight, store.Height()))
}
// SANITY CHECK END
requestsCh := make(chan BlockRequest, defaultChannelCapacity)
timeoutsCh := make(chan string, defaultChannelCapacity)
pool := NewBlockPool(
store.Height()+1,
requestsCh,
timeoutsCh,
)
bcR := &BlockchainReactor{
state: state,
store: store,
pool: pool,
sync: sync,
requestsCh: requestsCh,
timeoutsCh: timeoutsCh,
quit: make(chan struct{}),
running: uint32(0),
}
return bcR
}
// Implements Reactor
func (bcR *BlockchainReactor) Start(sw *p2p.Switch) {
if atomic.CompareAndSwapUint32(&bcR.running, 0, 1) {
log.Info("Starting BlockchainReactor")
bcR.sw = sw
if bcR.sync {
bcR.pool.Start()
go bcR.poolRoutine()
}
}
}
// Implements Reactor
func (bcR *BlockchainReactor) Stop() {
if atomic.CompareAndSwapUint32(&bcR.running, 1, 0) {
log.Info("Stopping BlockchainReactor")
close(bcR.quit)
bcR.pool.Stop()
}
}
// Implements Reactor
func (bcR *BlockchainReactor) GetChannels() []*p2p.ChannelDescriptor {
return []*p2p.ChannelDescriptor{
&p2p.ChannelDescriptor{
Id: BlockchainChannel,
Priority: 5,
SendQueueCapacity: 100,
},
}
}
// Implements Reactor
func (bcR *BlockchainReactor) AddPeer(peer *p2p.Peer) {
// Send peer our state.
peer.Send(BlockchainChannel, &bcStatusResponseMessage{bcR.store.Height()})
}
// Implements Reactor
func (bcR *BlockchainReactor) RemovePeer(peer *p2p.Peer, reason interface{}) {
// Remove peer from the pool.
bcR.pool.RemovePeer(peer.Key)
}
// Implements Reactor
func (bcR *BlockchainReactor) Receive(chId byte, src *p2p.Peer, msgBytes []byte) {
_, msg, err := DecodeMessage(msgBytes)
if err != nil {
log.Warn("Error decoding message", "error", err)
return
}
log.Info("Received message", "msg", msg)
switch msg := msg.(type) {
case *bcBlockRequestMessage:
// Got a request for a block. Respond with block if we have it.
block := bcR.store.LoadBlock(msg.Height)
if block != nil {
msg := &bcBlockResponseMessage{Block: block}
queued := src.TrySend(BlockchainChannel, msg)
if !queued {
// queue is full, just ignore.
}
} else {
// TODO peer is asking for things we don't have.
}
case *bcBlockResponseMessage:
// Got a block.
bcR.pool.AddBlock(msg.Block, src.Key)
case *bcStatusRequestMessage:
// Send peer our state.
queued := src.TrySend(BlockchainChannel, &bcStatusResponseMessage{bcR.store.Height()})
if !queued {
// sorry
}
case *bcStatusResponseMessage:
// Got a peer status. Unverified.
bcR.pool.SetPeerHeight(src.Key, msg.Height)
default:
log.Warn(Fmt("Unknown message type %v", reflect.TypeOf(msg)))
}
}
// Handle messages from the poolReactor telling the reactor what to do.
// NOTE: Don't sleep in the FOR_LOOP or otherwise slow it down!
// (Except for the SYNC_LOOP, which is the primary purpose and must be synchronous.)
func (bcR *BlockchainReactor) poolRoutine() {
trySyncTicker := time.NewTicker(trySyncIntervalMS * time.Millisecond)
statusUpdateTicker := time.NewTicker(statusUpdateIntervalSeconds * time.Second)
switchToConsensusTicker := time.NewTicker(switchToConsensusIntervalSeconds * time.Second)
FOR_LOOP:
for {
select {
case request := <-bcR.requestsCh: // chan BlockRequest
peer := bcR.sw.Peers().Get(request.PeerId)
if peer == nil {
// We can't assign the request.
continue FOR_LOOP
}
msg := &bcBlockRequestMessage{request.Height}
queued := peer.TrySend(BlockchainChannel, msg)
if !queued {
// We couldn't make the request, send-queue full.
// The pool handles retries, so just let it go.
continue FOR_LOOP
}
case peerId := <-bcR.timeoutsCh: // chan string
// Peer timed out.
peer := bcR.sw.Peers().Get(peerId)
if peer != nil {
bcR.sw.StopPeerForError(peer, errors.New("BlockchainReactor Timeout"))
}
case _ = <-statusUpdateTicker.C:
// ask for status updates
go bcR.BroadcastStatusRequest()
case _ = <-switchToConsensusTicker.C:
// not thread safe access for numUnassigned and numPending but should be fine
// TODO make threadsafe and use exposed functions
outbound, inbound, _ := bcR.sw.NumPeers()
log.Debug("Consensus ticker", "numUnassigned", bcR.pool.numUnassigned, "numPending", bcR.pool.numPending,
"total", len(bcR.pool.requests), "outbound", outbound, "inbound", inbound)
// NOTE: this condition is very strict right now. may need to weaken
// If all `maxPendingRequests` requests are unassigned
// and we have some peers (say >= 3), then we're caught up
maxPending := bcR.pool.numPending == maxPendingRequests
allUnassigned := bcR.pool.numPending == bcR.pool.numUnassigned
enoughPeers := outbound+inbound >= 3
if maxPending && allUnassigned && enoughPeers {
log.Info("Time to switch to consensus reactor!", "height", bcR.pool.height)
bcR.pool.Stop()
conR := bcR.sw.Reactor("CONSENSUS").(consensusReactor)
conR.SwitchToConsensus(bcR.state)
break FOR_LOOP
}
case _ = <-trySyncTicker.C: // chan time
// This loop can be slow as long as it's doing syncing work.
SYNC_LOOP:
for i := 0; i < 10; i++ {
// See if there are any blocks to sync.
first, second := bcR.pool.PeekTwoBlocks()
//log.Debug("TrySync peeked", "first", first, "second", second)
if first == nil || second == nil {
// We need both to sync the first block.
break SYNC_LOOP
}
firstParts := first.MakePartSet()
firstPartsHeader := firstParts.Header()
// Finally, verify the first block using the second's validation.
err := bcR.state.BondedValidators.VerifyValidation(
bcR.state.ChainID, first.Hash(), firstPartsHeader, first.Height, second.LastValidation)
if err != nil {
log.Debug("error in validation", "error", err)
bcR.pool.RedoRequest(first.Height)
break SYNC_LOOP
} else {
bcR.pool.PopRequest()
err := sm.ExecBlock(bcR.state, first, firstPartsHeader)
if err != nil {
// TODO This is bad, are we zombie?
panic(Fmt("Failed to process committed block: %v", err))
}
bcR.store.SaveBlock(first, firstParts, second.LastValidation)
bcR.state.Save()
}
}
continue FOR_LOOP
case <-bcR.quit:
break FOR_LOOP
}
}
}
func (bcR *BlockchainReactor) BroadcastStatusResponse() error {
bcR.sw.Broadcast(BlockchainChannel, &bcStatusResponseMessage{bcR.store.Height()})
return nil
}
func (bcR *BlockchainReactor) BroadcastStatusRequest() error {
bcR.sw.Broadcast(BlockchainChannel, &bcStatusRequestMessage{bcR.store.Height()})
return nil
}
// implements events.Eventable
func (bcR *BlockchainReactor) SetFireable(evsw events.Fireable) {
bcR.evsw = evsw
}
//-----------------------------------------------------------------------------
// Messages
const (
msgTypeBlockRequest = byte(0x10)
msgTypeBlockResponse = byte(0x11)
msgTypeStatusResponse = byte(0x20)
msgTypeStatusRequest = byte(0x21)
)
type BlockchainMessage interface{}
var _ = binary.RegisterInterface(
struct{ BlockchainMessage }{},
binary.ConcreteType{&bcBlockRequestMessage{}, msgTypeBlockRequest},
binary.ConcreteType{&bcBlockResponseMessage{}, msgTypeBlockResponse},
binary.ConcreteType{&bcStatusResponseMessage{}, msgTypeStatusResponse},
binary.ConcreteType{&bcStatusRequestMessage{}, msgTypeStatusRequest},
)
func DecodeMessage(bz []byte) (msgType byte, msg BlockchainMessage, err error) {
msgType = bz[0]
n := new(int64)
r := bytes.NewReader(bz)
msg = binary.ReadBinary(struct{ BlockchainMessage }{}, r, n, &err).(struct{ BlockchainMessage }).BlockchainMessage
return
}
//-------------------------------------
type bcBlockRequestMessage struct {
Height int
}
func (m *bcBlockRequestMessage) String() string {
return fmt.Sprintf("[bcBlockRequestMessage %v]", m.Height)
}
//-------------------------------------
type bcBlockResponseMessage struct {
Block *types.Block
}
func (m *bcBlockResponseMessage) String() string {
return fmt.Sprintf("[bcBlockResponseMessage %v]", m.Block.Height)
}
//-------------------------------------
type bcStatusRequestMessage struct {
Height int
}
func (m *bcStatusRequestMessage) String() string {
return fmt.Sprintf("[bcStatusRequestMessage %v]", m.Height)
}
//-------------------------------------
type bcStatusResponseMessage struct {
Height int
}
func (m *bcStatusResponseMessage) String() string {
return fmt.Sprintf("[bcStatusResponseMessage %v]", m.Height)
}