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519 lines
13 KiB
519 lines
13 KiB
package v2
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import (
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"errors"
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"fmt"
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"sync"
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"time"
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"github.com/tendermint/tendermint/behaviour"
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bc "github.com/tendermint/tendermint/blockchain"
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"github.com/tendermint/tendermint/libs/log"
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"github.com/tendermint/tendermint/p2p"
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bcproto "github.com/tendermint/tendermint/proto/tendermint/blockchain"
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"github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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)
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const (
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// chBufferSize is the buffer size of all event channels.
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chBufferSize int = 1000
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)
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type blockStore interface {
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LoadBlock(height int64) *types.Block
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SaveBlock(*types.Block, *types.PartSet, *types.Commit)
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Base() int64
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Height() int64
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}
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// BlockchainReactor handles fast sync protocol.
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type BlockchainReactor struct {
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p2p.BaseReactor
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fastSync bool // if true, enable fast sync on start
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stateSynced bool // set to true when SwitchToFastSync is called by state sync
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scheduler *Routine
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processor *Routine
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logger log.Logger
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mtx sync.RWMutex
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maxPeerHeight int64
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syncHeight int64
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events chan Event // non-nil during a fast sync
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reporter behaviour.Reporter
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io iIO
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store blockStore
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}
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//nolint:unused,deadcode
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type blockVerifier interface {
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VerifyCommit(chainID string, blockID types.BlockID, height int64, commit *types.Commit) error
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}
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type blockApplier interface {
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ApplyBlock(state state.State, blockID types.BlockID, block *types.Block) (state.State, int64, error)
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}
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// XXX: unify naming in this package around tmState
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func newReactor(state state.State, store blockStore, reporter behaviour.Reporter,
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blockApplier blockApplier, fastSync bool) *BlockchainReactor {
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scheduler := newScheduler(state.LastBlockHeight, time.Now())
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pContext := newProcessorContext(store, blockApplier, state)
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// TODO: Fix naming to just newProcesssor
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// newPcState requires a processorContext
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processor := newPcState(pContext)
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return &BlockchainReactor{
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scheduler: newRoutine("scheduler", scheduler.handle, chBufferSize),
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processor: newRoutine("processor", processor.handle, chBufferSize),
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store: store,
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reporter: reporter,
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logger: log.NewNopLogger(),
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fastSync: fastSync,
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}
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}
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// NewBlockchainReactor creates a new reactor instance.
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func NewBlockchainReactor(
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state state.State,
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blockApplier blockApplier,
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store blockStore,
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fastSync bool) *BlockchainReactor {
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reporter := behaviour.NewMockReporter()
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return newReactor(state, store, reporter, blockApplier, fastSync)
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}
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// SetSwitch implements Reactor interface.
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func (r *BlockchainReactor) SetSwitch(sw *p2p.Switch) {
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r.Switch = sw
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if sw != nil {
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r.io = newSwitchIo(sw)
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} else {
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r.io = nil
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}
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}
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func (r *BlockchainReactor) setMaxPeerHeight(height int64) {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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if height > r.maxPeerHeight {
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r.maxPeerHeight = height
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}
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}
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func (r *BlockchainReactor) setSyncHeight(height int64) {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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r.syncHeight = height
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}
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// SyncHeight returns the height to which the BlockchainReactor has synced.
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func (r *BlockchainReactor) SyncHeight() int64 {
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r.mtx.RLock()
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defer r.mtx.RUnlock()
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return r.syncHeight
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}
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// SetLogger sets the logger of the reactor.
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func (r *BlockchainReactor) SetLogger(logger log.Logger) {
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r.logger = logger
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r.scheduler.setLogger(logger)
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r.processor.setLogger(logger)
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}
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// Start implements cmn.Service interface
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func (r *BlockchainReactor) Start() error {
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r.reporter = behaviour.NewSwitchReporter(r.BaseReactor.Switch)
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if r.fastSync {
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err := r.startSync(nil)
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if err != nil {
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return fmt.Errorf("failed to start fast sync: %w", err)
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}
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}
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return nil
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}
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// startSync begins a fast sync, signalled by r.events being non-nil. If state is non-nil,
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// the scheduler and processor is updated with this state on startup.
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func (r *BlockchainReactor) startSync(state *state.State) error {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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if r.events != nil {
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return errors.New("fast sync already in progress")
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}
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r.events = make(chan Event, chBufferSize)
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go r.scheduler.start()
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go r.processor.start()
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if state != nil {
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<-r.scheduler.ready()
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<-r.processor.ready()
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r.scheduler.send(bcResetState{state: *state})
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r.processor.send(bcResetState{state: *state})
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}
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go r.demux(r.events)
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return nil
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}
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// endSync ends a fast sync
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func (r *BlockchainReactor) endSync() {
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r.mtx.Lock()
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defer r.mtx.Unlock()
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if r.events != nil {
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close(r.events)
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}
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r.events = nil
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r.scheduler.stop()
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r.processor.stop()
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}
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// SwitchToFastSync is called by the state sync reactor when switching to fast sync.
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func (r *BlockchainReactor) SwitchToFastSync(state state.State) error {
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r.stateSynced = true
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state = state.Copy()
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return r.startSync(&state)
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}
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// reactor generated ticker events:
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// ticker for cleaning peers
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type rTryPrunePeer struct {
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priorityHigh
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time time.Time
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}
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func (e rTryPrunePeer) String() string {
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return fmt.Sprintf(": %v", e.time)
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}
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// ticker event for scheduling block requests
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type rTrySchedule struct {
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priorityHigh
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time time.Time
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}
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func (e rTrySchedule) String() string {
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return fmt.Sprintf(": %v", e.time)
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}
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// ticker for block processing
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type rProcessBlock struct {
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priorityNormal
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}
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// reactor generated events based on blockchain related messages from peers:
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// blockResponse message received from a peer
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type bcBlockResponse struct {
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priorityNormal
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time time.Time
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peerID p2p.ID
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size int64
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block *types.Block
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}
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// blockNoResponse message received from a peer
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type bcNoBlockResponse struct {
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priorityNormal
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time time.Time
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peerID p2p.ID
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height int64
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}
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// statusResponse message received from a peer
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type bcStatusResponse struct {
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priorityNormal
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time time.Time
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peerID p2p.ID
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base int64
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height int64
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}
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// new peer is connected
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type bcAddNewPeer struct {
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priorityNormal
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peerID p2p.ID
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}
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// existing peer is removed
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type bcRemovePeer struct {
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priorityHigh
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peerID p2p.ID
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reason interface{}
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}
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// resets the scheduler and processor state, e.g. following a switch from state syncing
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type bcResetState struct {
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priorityHigh
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state state.State
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}
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// Takes the channel as a parameter to avoid race conditions on r.events.
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func (r *BlockchainReactor) demux(events <-chan Event) {
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var lastRate = 0.0
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var lastHundred = time.Now()
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var (
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processBlockFreq = 20 * time.Millisecond
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doProcessBlockCh = make(chan struct{}, 1)
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doProcessBlockTk = time.NewTicker(processBlockFreq)
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)
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defer doProcessBlockTk.Stop()
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var (
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prunePeerFreq = 1 * time.Second
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doPrunePeerCh = make(chan struct{}, 1)
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doPrunePeerTk = time.NewTicker(prunePeerFreq)
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)
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defer doPrunePeerTk.Stop()
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var (
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scheduleFreq = 20 * time.Millisecond
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doScheduleCh = make(chan struct{}, 1)
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doScheduleTk = time.NewTicker(scheduleFreq)
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)
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defer doScheduleTk.Stop()
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var (
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statusFreq = 10 * time.Second
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doStatusCh = make(chan struct{}, 1)
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doStatusTk = time.NewTicker(statusFreq)
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)
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defer doStatusTk.Stop()
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doStatusCh <- struct{}{} // immediately broadcast to get status of existing peers
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// XXX: Extract timers to make testing atemporal
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for {
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select {
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// Pacers: send at most per frequency but don't saturate
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case <-doProcessBlockTk.C:
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select {
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case doProcessBlockCh <- struct{}{}:
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default:
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}
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case <-doPrunePeerTk.C:
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select {
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case doPrunePeerCh <- struct{}{}:
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default:
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}
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case <-doScheduleTk.C:
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select {
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case doScheduleCh <- struct{}{}:
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default:
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}
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case <-doStatusTk.C:
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select {
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case doStatusCh <- struct{}{}:
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default:
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}
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// Tickers: perform tasks periodically
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case <-doScheduleCh:
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r.scheduler.send(rTrySchedule{time: time.Now()})
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case <-doPrunePeerCh:
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r.scheduler.send(rTryPrunePeer{time: time.Now()})
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case <-doProcessBlockCh:
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r.processor.send(rProcessBlock{})
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case <-doStatusCh:
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r.io.broadcastStatusRequest(r.store.Base(), r.SyncHeight())
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// Events from peers. Closing the channel signals event loop termination.
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case event, ok := <-events:
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if !ok {
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r.logger.Info("Stopping event processing")
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return
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}
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switch event := event.(type) {
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case bcStatusResponse:
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r.setMaxPeerHeight(event.height)
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r.scheduler.send(event)
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case bcAddNewPeer, bcRemovePeer, bcBlockResponse, bcNoBlockResponse:
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r.scheduler.send(event)
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default:
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r.logger.Error("Received unexpected event", "event", fmt.Sprintf("%T", event))
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}
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// Incremental events from scheduler
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case event := <-r.scheduler.next():
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switch event := event.(type) {
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case scBlockReceived:
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r.processor.send(event)
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case scPeerError:
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r.processor.send(event)
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r.reporter.Report(behaviour.BadMessage(event.peerID, "scPeerError"))
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case scBlockRequest:
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r.io.sendBlockRequest(event.peerID, event.height)
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case scFinishedEv:
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r.processor.send(event)
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r.scheduler.stop()
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case scSchedulerFail:
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r.logger.Error("Scheduler failure", "err", event.reason.Error())
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case scPeersPruned:
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r.logger.Debug("Pruned peers", "count", len(event.peers))
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case noOpEvent:
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default:
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r.logger.Error("Received unexpected scheduler event", "event", fmt.Sprintf("%T", event))
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}
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// Incremental events from processor
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case event := <-r.processor.next():
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switch event := event.(type) {
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case pcBlockProcessed:
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r.setSyncHeight(event.height)
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if r.syncHeight%100 == 0 {
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lastRate = 0.9*lastRate + 0.1*(100/time.Since(lastHundred).Seconds())
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r.logger.Info("Fast Sync Rate", "height", r.syncHeight,
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"max_peer_height", r.maxPeerHeight, "blocks/s", lastRate)
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lastHundred = time.Now()
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}
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r.scheduler.send(event)
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case pcBlockVerificationFailure:
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r.scheduler.send(event)
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case pcFinished:
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r.logger.Info("Fast sync complete, switching to consensus")
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if !r.io.trySwitchToConsensus(event.tmState, event.blocksSynced > 0 || r.stateSynced) {
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r.logger.Error("Failed to switch to consensus reactor")
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}
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r.endSync()
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return
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case noOpEvent:
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default:
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r.logger.Error("Received unexpected processor event", "event", fmt.Sprintf("%T", event))
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}
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// Terminal event from scheduler
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case err := <-r.scheduler.final():
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switch err {
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case nil:
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r.logger.Info("Scheduler stopped")
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default:
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r.logger.Error("Scheduler aborted with error", "err", err)
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}
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// Terminal event from processor
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case err := <-r.processor.final():
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switch err {
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case nil:
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r.logger.Info("Processor stopped")
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default:
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r.logger.Error("Processor aborted with error", "err", err)
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}
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}
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}
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}
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// Stop implements cmn.Service interface.
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func (r *BlockchainReactor) Stop() error {
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r.logger.Info("reactor stopping")
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r.endSync()
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r.logger.Info("reactor stopped")
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return nil
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}
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// Receive implements Reactor by handling different message types.
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func (r *BlockchainReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
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msg, err := bc.DecodeMsg(msgBytes)
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if err != nil {
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r.logger.Error("error decoding message",
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"src", src.ID(), "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
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_ = r.reporter.Report(behaviour.BadMessage(src.ID(), err.Error()))
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return
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}
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if err = bc.ValidateMsg(msg); err != nil {
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r.logger.Error("peer sent us invalid msg", "peer", src, "msg", msg, "err", err)
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_ = r.reporter.Report(behaviour.BadMessage(src.ID(), err.Error()))
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return
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}
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r.logger.Debug("Receive", "src", src.ID(), "chID", chID, "msg", msg)
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switch msg := msg.(type) {
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case *bcproto.StatusRequest:
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if err := r.io.sendStatusResponse(r.store.Base(), r.store.Height(), src.ID()); err != nil {
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r.logger.Error("Could not send status message to peer", "src", src)
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}
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case *bcproto.BlockRequest:
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block := r.store.LoadBlock(msg.Height)
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if block != nil {
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if err = r.io.sendBlockToPeer(block, src.ID()); err != nil {
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r.logger.Error("Could not send block message to peer: ", err)
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}
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} else {
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r.logger.Info("peer asking for a block we don't have", "src", src, "height", msg.Height)
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peerID := src.ID()
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if err = r.io.sendBlockNotFound(msg.Height, peerID); err != nil {
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r.logger.Error("Couldn't send block not found: ", err)
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}
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}
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case *bcproto.StatusResponse:
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r.mtx.RLock()
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if r.events != nil {
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r.events <- bcStatusResponse{peerID: src.ID(), base: msg.Base, height: msg.Height}
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}
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r.mtx.RUnlock()
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case *bcproto.BlockResponse:
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r.mtx.RLock()
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bi, err := types.BlockFromProto(msg.Block)
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if err != nil {
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r.logger.Error("error transitioning block from protobuf", "err", err)
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return
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}
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if r.events != nil {
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r.events <- bcBlockResponse{
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peerID: src.ID(),
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block: bi,
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size: int64(len(msgBytes)),
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time: time.Now(),
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}
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}
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r.mtx.RUnlock()
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case *bcproto.NoBlockResponse:
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r.mtx.RLock()
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if r.events != nil {
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r.events <- bcNoBlockResponse{peerID: src.ID(), height: msg.Height, time: time.Now()}
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}
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r.mtx.RUnlock()
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}
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}
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// AddPeer implements Reactor interface
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func (r *BlockchainReactor) AddPeer(peer p2p.Peer) {
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err := r.io.sendStatusResponse(r.store.Base(), r.store.Height(), peer.ID())
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if err != nil {
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r.logger.Error("Could not send status message to peer new", "src", peer.ID, "height", r.SyncHeight())
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}
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r.mtx.RLock()
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defer r.mtx.RUnlock()
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if r.events != nil {
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r.events <- bcAddNewPeer{peerID: peer.ID()}
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}
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}
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// RemovePeer implements Reactor interface.
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func (r *BlockchainReactor) RemovePeer(peer p2p.Peer, reason interface{}) {
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r.mtx.RLock()
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defer r.mtx.RUnlock()
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if r.events != nil {
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r.events <- bcRemovePeer{
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peerID: peer.ID(),
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reason: reason,
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}
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}
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}
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// GetChannels implements Reactor
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func (r *BlockchainReactor) GetChannels() []*p2p.ChannelDescriptor {
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return []*p2p.ChannelDescriptor{
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{
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ID: BlockchainChannel,
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Priority: 10,
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SendQueueCapacity: 2000,
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RecvBufferCapacity: 50 * 4096,
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RecvMessageCapacity: bc.MaxMsgSize,
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},
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}
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}
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