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package v2
import (
"fmt"
"github.com/tendermint/tendermint/p2p"
tmState "github.com/tendermint/tendermint/state"
"github.com/tendermint/tendermint/types"
)
// Events generated by the processor:
// block execution failure, event will indicate the peer(s) that caused the error
type pcBlockVerificationFailure struct {
priorityNormal
height int64
firstPeerID p2p.ID
secondPeerID p2p.ID
}
// successful block execution
type pcBlockProcessed struct {
priorityNormal
height int64
peerID p2p.ID
}
// processor has finished
type pcFinished struct {
priorityNormal
blocksSynced int
tmState tmState.State
}
func (p pcFinished) Error() string {
return "finished"
}
type queueItem struct {
block *types.Block
peerID p2p.ID
}
type blockQueue map[int64]queueItem
type pcState struct {
// blocks waiting to be processed
queue blockQueue
// draining indicates that the next rProcessBlock event with a queue miss constitutes completion
draining bool
// the number of blocks successfully synced by the processor
blocksSynced int
// the processorContext which contains the processor dependencies
context processorContext
}
func (state *pcState) String() string {
return fmt.Sprintf("height: %d queue length: %d draining: %v blocks synced: %d",
state.height(), len(state.queue), state.draining, state.blocksSynced)
}
// newPcState returns a pcState initialized with the last verified block enqueued
func newPcState(context processorContext) *pcState {
return &pcState{
queue: blockQueue{},
draining: false,
blocksSynced: 0,
context: context,
}
}
// nextTwo returns the next two unverified blocks
func (state *pcState) nextTwo() (queueItem, queueItem, error) {
if first, ok := state.queue[state.height()+1]; ok {
if second, ok := state.queue[state.height()+2]; ok {
return first, second, nil
}
}
return queueItem{}, queueItem{}, fmt.Errorf("not found")
}
// synced returns true when at most the last verified block remains in the queue
func (state *pcState) synced() bool {
return len(state.queue) <= 1
}
func (state *pcState) enqueue(peerID p2p.ID, block *types.Block, height int64) {
if _, ok := state.queue[height]; ok {
panic("duplicate block enqueued by processor")
}
state.queue[height] = queueItem{block: block, peerID: peerID}
}
func (state *pcState) height() int64 {
return state.context.tmState().LastBlockHeight
}
// purgePeer moves all unprocessed blocks from the queue
func (state *pcState) purgePeer(peerID p2p.ID) {
// what if height is less than state.height?
for height, item := range state.queue {
if item.peerID == peerID {
delete(state.queue, height)
}
}
}
// handle processes FSM events
func (state *pcState) handle(event Event) (Event, error) {
switch event := event.(type) {
case scFinishedEv:
if state.synced() {
return pcFinished{tmState: state.context.tmState(), blocksSynced: state.blocksSynced}, nil
}
state.draining = true
return noOp, nil
case scPeerError:
state.purgePeer(event.peerID)
return noOp, nil
case scBlockReceived:
if event.block == nil {
return noOp, nil
}
// enqueue block if height is higher than state height, else ignore it
if event.block.Height > state.height() {
state.enqueue(event.peerID, event.block, event.block.Height)
}
return noOp, nil
case rProcessBlock:
tmState := state.context.tmState()
firstItem, secondItem, err := state.nextTwo()
if err != nil {
if state.draining {
return pcFinished{tmState: tmState, blocksSynced: state.blocksSynced}, nil
}
return noOp, nil
}
first, second := firstItem.block, secondItem.block
firstParts := first.MakePartSet(types.BlockPartSizeBytes)
firstPartsHeader := firstParts.Header()
firstID := types.BlockID{Hash: first.Hash(), PartsHeader: firstPartsHeader}
err = state.context.verifyCommit(tmState.ChainID, firstID, first.Height, second.LastCommit)
if err != nil {
state.purgePeer(firstItem.peerID)
state.purgePeer(secondItem.peerID)
return pcBlockVerificationFailure{
height: first.Height, firstPeerID: firstItem.peerID, secondPeerID: secondItem.peerID},
nil
}
state.context.saveBlock(first, firstParts, second.LastCommit)
if err := state.context.applyBlock(firstID, first); err != nil {
panic(fmt.Sprintf("failed to process committed block (%d:%X): %v", first.Height, first.Hash(), err))
}
delete(state.queue, first.Height)
state.blocksSynced++
return pcBlockProcessed{height: first.Height, peerID: firstItem.peerID}, nil
}
return noOp, nil
}