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.
370 lines
12 KiB
370 lines
12 KiB
package blockchain
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"reflect"
|
|
"time"
|
|
|
|
wire "github.com/tendermint/go-wire"
|
|
"github.com/tendermint/tendermint/p2p"
|
|
"github.com/tendermint/tendermint/proxy"
|
|
sm "github.com/tendermint/tendermint/state"
|
|
"github.com/tendermint/tendermint/types"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
)
|
|
|
|
const (
|
|
// BlockchainChannel is a channel for blocks and status updates (`BlockStore` height)
|
|
BlockchainChannel = byte(0x40)
|
|
|
|
defaultChannelCapacity = 100
|
|
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 = 1
|
|
)
|
|
|
|
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 {
|
|
p2p.BaseReactor
|
|
|
|
state *sm.State
|
|
proxyAppConn proxy.AppConnConsensus // same as consensus.proxyAppConn
|
|
store *BlockStore
|
|
pool *BlockPool
|
|
fastSync bool
|
|
requestsCh chan BlockRequest
|
|
timeoutsCh chan string
|
|
|
|
evsw types.EventSwitch
|
|
}
|
|
|
|
// NewBlockchainReactor returns new reactor instance.
|
|
func NewBlockchainReactor(state *sm.State, proxyAppConn proxy.AppConnConsensus, store *BlockStore, fastSync bool) *BlockchainReactor {
|
|
if state.LastBlockHeight == store.Height()-1 {
|
|
store.height-- // XXX HACK, make this better
|
|
}
|
|
if state.LastBlockHeight != store.Height() {
|
|
cmn.PanicSanity(cmn.Fmt("state (%v) and store (%v) height mismatch", state.LastBlockHeight, store.Height()))
|
|
}
|
|
requestsCh := make(chan BlockRequest, defaultChannelCapacity)
|
|
timeoutsCh := make(chan string, defaultChannelCapacity)
|
|
pool := NewBlockPool(
|
|
store.Height()+1,
|
|
requestsCh,
|
|
timeoutsCh,
|
|
)
|
|
bcR := &BlockchainReactor{
|
|
state: state,
|
|
proxyAppConn: proxyAppConn,
|
|
store: store,
|
|
pool: pool,
|
|
fastSync: fastSync,
|
|
requestsCh: requestsCh,
|
|
timeoutsCh: timeoutsCh,
|
|
}
|
|
bcR.BaseReactor = *p2p.NewBaseReactor("BlockchainReactor", bcR)
|
|
return bcR
|
|
}
|
|
|
|
// OnStart implements BaseService
|
|
func (bcR *BlockchainReactor) OnStart() error {
|
|
bcR.BaseReactor.OnStart()
|
|
if bcR.fastSync {
|
|
_, err := bcR.pool.Start()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
go bcR.poolRoutine()
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// OnStop implements BaseService
|
|
func (bcR *BlockchainReactor) OnStop() {
|
|
bcR.BaseReactor.OnStop()
|
|
bcR.pool.Stop()
|
|
}
|
|
|
|
// GetChannels implements Reactor
|
|
func (bcR *BlockchainReactor) GetChannels() []*p2p.ChannelDescriptor {
|
|
return []*p2p.ChannelDescriptor{
|
|
&p2p.ChannelDescriptor{
|
|
ID: BlockchainChannel,
|
|
Priority: 5,
|
|
SendQueueCapacity: 100,
|
|
},
|
|
}
|
|
}
|
|
|
|
// AddPeer implements Reactor by sending our state to peer.
|
|
func (bcR *BlockchainReactor) AddPeer(peer p2p.Peer) {
|
|
if !peer.Send(BlockchainChannel, struct{ BlockchainMessage }{&bcStatusResponseMessage{bcR.store.Height()}}) {
|
|
// doing nothing, will try later in `poolRoutine`
|
|
}
|
|
}
|
|
|
|
// RemovePeer implements Reactor by removing peer from the pool.
|
|
func (bcR *BlockchainReactor) RemovePeer(peer p2p.Peer, reason interface{}) {
|
|
bcR.pool.RemovePeer(peer.Key())
|
|
}
|
|
|
|
// respondToPeer loads a block and sends it to the requesting peer,
|
|
// if we have it. Otherwise, we'll respond saying we don't have it.
|
|
// According to the Tendermint spec, if all nodes are honest,
|
|
// no node should be requesting for a block that's non-existent.
|
|
func (bcR *BlockchainReactor) respondToPeer(msg *bcBlockRequestMessage, src p2p.Peer) (queued bool) {
|
|
block := bcR.store.LoadBlock(msg.Height)
|
|
if block != nil {
|
|
msg := &bcBlockResponseMessage{Block: block}
|
|
return src.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
|
|
}
|
|
|
|
bcR.Logger.Info("Peer asking for a block we don't have", "src", src, "height", msg.Height)
|
|
|
|
return src.TrySend(BlockchainChannel, struct{ BlockchainMessage }{
|
|
&bcNoBlockResponseMessage{Height: msg.Height},
|
|
})
|
|
}
|
|
|
|
// Receive implements Reactor by handling 4 types of messages (look below).
|
|
func (bcR *BlockchainReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
|
|
_, msg, err := DecodeMessage(msgBytes, bcR.maxMsgSize())
|
|
if err != nil {
|
|
bcR.Logger.Error("Error decoding message", "err", err)
|
|
return
|
|
}
|
|
|
|
bcR.Logger.Debug("Receive", "src", src, "chID", chID, "msg", msg)
|
|
|
|
// TODO: improve logic to satisfy megacheck
|
|
switch msg := msg.(type) {
|
|
case *bcBlockRequestMessage:
|
|
if queued := bcR.respondToPeer(msg, src); !queued {
|
|
// Unfortunately not queued since the queue is full.
|
|
}
|
|
case *bcBlockResponseMessage:
|
|
// Got a block.
|
|
bcR.pool.AddBlock(src.Key(), msg.Block, len(msgBytes))
|
|
case *bcStatusRequestMessage:
|
|
// Send peer our state.
|
|
queued := src.TrySend(BlockchainChannel, struct{ BlockchainMessage }{&bcStatusResponseMessage{bcR.store.Height()}})
|
|
if !queued {
|
|
// sorry
|
|
}
|
|
case *bcStatusResponseMessage:
|
|
// Got a peer status. Unverified.
|
|
bcR.pool.SetPeerHeight(src.Key(), msg.Height)
|
|
default:
|
|
bcR.Logger.Error(cmn.Fmt("Unknown message type %v", reflect.TypeOf(msg)))
|
|
}
|
|
}
|
|
|
|
// maxMsgSize returns the maximum allowable size of a
|
|
// message on the blockchain reactor.
|
|
func (bcR *BlockchainReactor) maxMsgSize() int {
|
|
return bcR.state.Params.BlockSizeParams.MaxBytes + 2
|
|
}
|
|
|
|
// 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)
|
|
|
|
chainID := bcR.state.ChainID
|
|
|
|
FOR_LOOP:
|
|
for {
|
|
select {
|
|
case request := <-bcR.requestsCh: // chan BlockRequest
|
|
peer := bcR.Switch.Peers().Get(request.PeerID)
|
|
if peer == nil {
|
|
continue FOR_LOOP // Peer has since been disconnected.
|
|
}
|
|
msg := &bcBlockRequestMessage{request.Height}
|
|
queued := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
|
|
if !queued {
|
|
// We couldn't make the request, send-queue full.
|
|
// The pool handles timeouts, just let it go.
|
|
continue FOR_LOOP
|
|
}
|
|
case peerID := <-bcR.timeoutsCh: // chan string
|
|
// Peer timed out.
|
|
peer := bcR.Switch.Peers().Get(peerID)
|
|
if peer != nil {
|
|
bcR.Switch.StopPeerForError(peer, errors.New("BlockchainReactor Timeout"))
|
|
}
|
|
case <-statusUpdateTicker.C:
|
|
// ask for status updates
|
|
go bcR.BroadcastStatusRequest()
|
|
case <-switchToConsensusTicker.C:
|
|
height, numPending, _ := bcR.pool.GetStatus()
|
|
outbound, inbound, _ := bcR.Switch.NumPeers()
|
|
bcR.Logger.Info("Consensus ticker", "numPending", numPending, "total", len(bcR.pool.requesters),
|
|
"outbound", outbound, "inbound", inbound)
|
|
if bcR.pool.IsCaughtUp() {
|
|
bcR.Logger.Info("Time to switch to consensus reactor!", "height", height)
|
|
bcR.pool.Stop()
|
|
|
|
conR := bcR.Switch.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()
|
|
//bcR.Logger.Info("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(bcR.state.Params.BlockPartSizeBytes)
|
|
firstPartsHeader := firstParts.Header()
|
|
// Finally, verify the first block using the second's commit
|
|
// NOTE: we can probably make this more efficient, but note that calling
|
|
// first.Hash() doesn't verify the tx contents, so MakePartSet() is
|
|
// currently necessary.
|
|
err := bcR.state.Validators.VerifyCommit(
|
|
chainID, types.BlockID{first.Hash(), firstPartsHeader}, first.Height, second.LastCommit)
|
|
if err != nil {
|
|
bcR.Logger.Error("Error in validation", "err", err)
|
|
bcR.pool.RedoRequest(first.Height)
|
|
break SYNC_LOOP
|
|
} else {
|
|
bcR.pool.PopRequest()
|
|
|
|
bcR.store.SaveBlock(first, firstParts, second.LastCommit)
|
|
|
|
// TODO: should we be firing events? need to fire NewBlock events manually ...
|
|
// NOTE: we could improve performance if we
|
|
// didn't make the app commit to disk every block
|
|
// ... but we would need a way to get the hash without it persisting
|
|
err := bcR.state.ApplyBlock(bcR.evsw, bcR.proxyAppConn, first, firstPartsHeader, types.MockMempool{})
|
|
if err != nil {
|
|
// TODO This is bad, are we zombie?
|
|
cmn.PanicQ(cmn.Fmt("Failed to process committed block (%d:%X): %v", first.Height, first.Hash(), err))
|
|
}
|
|
}
|
|
}
|
|
continue FOR_LOOP
|
|
case <-bcR.Quit:
|
|
break FOR_LOOP
|
|
}
|
|
}
|
|
}
|
|
|
|
// BroadcastStatusRequest broadcasts `BlockStore` height.
|
|
func (bcR *BlockchainReactor) BroadcastStatusRequest() error {
|
|
bcR.Switch.Broadcast(BlockchainChannel, struct{ BlockchainMessage }{&bcStatusRequestMessage{bcR.store.Height()}})
|
|
return nil
|
|
}
|
|
|
|
// SetEventSwitch implements events.Eventable
|
|
func (bcR *BlockchainReactor) SetEventSwitch(evsw types.EventSwitch) {
|
|
bcR.evsw = evsw
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Messages
|
|
|
|
const (
|
|
msgTypeBlockRequest = byte(0x10)
|
|
msgTypeBlockResponse = byte(0x11)
|
|
msgTypeNoBlockResponse = byte(0x12)
|
|
msgTypeStatusResponse = byte(0x20)
|
|
msgTypeStatusRequest = byte(0x21)
|
|
)
|
|
|
|
// BlockchainMessage is a generic message for this reactor.
|
|
type BlockchainMessage interface{}
|
|
|
|
var _ = wire.RegisterInterface(
|
|
struct{ BlockchainMessage }{},
|
|
wire.ConcreteType{&bcBlockRequestMessage{}, msgTypeBlockRequest},
|
|
wire.ConcreteType{&bcBlockResponseMessage{}, msgTypeBlockResponse},
|
|
wire.ConcreteType{&bcNoBlockResponseMessage{}, msgTypeNoBlockResponse},
|
|
wire.ConcreteType{&bcStatusResponseMessage{}, msgTypeStatusResponse},
|
|
wire.ConcreteType{&bcStatusRequestMessage{}, msgTypeStatusRequest},
|
|
)
|
|
|
|
// DecodeMessage decodes BlockchainMessage.
|
|
// TODO: ensure that bz is completely read.
|
|
func DecodeMessage(bz []byte, maxSize int) (msgType byte, msg BlockchainMessage, err error) {
|
|
msgType = bz[0]
|
|
n := int(0)
|
|
r := bytes.NewReader(bz)
|
|
msg = wire.ReadBinary(struct{ BlockchainMessage }{}, r, maxSize, &n, &err).(struct{ BlockchainMessage }).BlockchainMessage
|
|
if err != nil && n != len(bz) {
|
|
err = errors.New("DecodeMessage() had bytes left over")
|
|
}
|
|
return
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type bcBlockRequestMessage struct {
|
|
Height int
|
|
}
|
|
|
|
func (m *bcBlockRequestMessage) String() string {
|
|
return cmn.Fmt("[bcBlockRequestMessage %v]", m.Height)
|
|
}
|
|
|
|
type bcNoBlockResponseMessage struct {
|
|
Height int
|
|
}
|
|
|
|
func (brm *bcNoBlockResponseMessage) String() string {
|
|
return cmn.Fmt("[bcNoBlockResponseMessage %d]", brm.Height)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
// NOTE: keep up-to-date with maxBlockchainResponseSize
|
|
type bcBlockResponseMessage struct {
|
|
Block *types.Block
|
|
}
|
|
|
|
func (m *bcBlockResponseMessage) String() string {
|
|
return cmn.Fmt("[bcBlockResponseMessage %v]", m.Block.Height)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type bcStatusRequestMessage struct {
|
|
Height int
|
|
}
|
|
|
|
func (m *bcStatusRequestMessage) String() string {
|
|
return cmn.Fmt("[bcStatusRequestMessage %v]", m.Height)
|
|
}
|
|
|
|
//-------------------------------------
|
|
|
|
type bcStatusResponseMessage struct {
|
|
Height int
|
|
}
|
|
|
|
func (m *bcStatusResponseMessage) String() string {
|
|
return cmn.Fmt("[bcStatusResponseMessage %v]", m.Height)
|
|
}
|