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reporter.go
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reporter.go
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package events
import (
"fmt"
"runtime/debug"
"sync"
"github.com/libp2p/go-libp2p/core/event"
"github.com/libp2p/go-libp2p/p2p/host/eventbus"
"go.uber.org/zap/zapcore"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/log"
)
// Subscription is a subscription to events.
// Consumer must be aware that publish will block if subsription is not read fast enough.
type Subscription = event.Subscription
var (
mu sync.RWMutex
// reporter is the event reporter singleton.
reporter *EventReporter
)
// InitializeReporter initializes the event reporting interface with
// a nonzero channel buffer. This is useful for testing, where we want reporting to
// block.
func InitializeReporter() {
mu.Lock()
defer mu.Unlock()
if reporter != nil {
return
}
reporter = newEventReporter()
}
// EventHook returns hook for logger.
func EventHook() func(entry zapcore.Entry) error {
return func(entry zapcore.Entry) error {
// If we report anything less than this we'll end up in an infinite loop
if entry.Level >= zapcore.ErrorLevel {
ReportError(NodeError{
Msg: entry.Message,
Trace: string(debug.Stack()),
Level: entry.Level,
})
}
return nil
}
}
// ReportNewTx dispatches incoming events to the reporter singleton.
func ReportNewTx(layerID types.LayerID, tx *types.Transaction) {
ReportTxWithValidity(layerID, tx, true)
}
// ReportTxWithValidity reports a tx along with whether it was just invalidated.
func ReportTxWithValidity(layerID types.LayerID, tx *types.Transaction, valid bool) {
mu.RLock()
defer mu.RUnlock()
txWithValidity := Transaction{
Transaction: tx,
LayerID: layerID,
Valid: valid,
}
if reporter != nil {
if err := reporter.transactionEmitter.Emit(txWithValidity); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit transaction", tx.ID, layerID, log.Err(err))
} else {
log.Debug("reported tx: %v", txWithValidity)
}
}
}
// ReportNewActivation reports a new activation.
func ReportNewActivation(activation *types.VerifiedActivationTx) {
mu.RLock()
defer mu.RUnlock()
activationTxEvent := ActivationTx{VerifiedActivationTx: activation}
if reporter != nil {
if err := reporter.activationEmitter.Emit(activationTxEvent); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit activation", activation.ID(), activation.PublishEpoch, log.Err(err))
}
}
}
// ReportRewardReceived reports a new reward.
func ReportRewardReceived(r types.Reward) {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
if err := reporter.rewardEmitter.Emit(r); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit rewards", r.Layer, log.Err(err))
} else {
log.Debug("reported reward: %v", r)
}
}
}
// ReportLayerUpdate reports a new layer, or an update to an existing layer.
func ReportLayerUpdate(layer LayerUpdate) {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
if err := reporter.layerEmitter.Emit(layer); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit updated layer", layer, log.Err(err))
} else {
log.With().Debug("reported new or updated layer", layer)
}
}
}
// ReportError reports an error.
func ReportError(err NodeError) {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
if err := reporter.errorEmitter.Emit(err); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit error", log.Err(err))
} else {
log.Debug("reported error: %v", err)
}
}
}
// ReportNodeStatusUpdate reports an update to the node status. It just
// pings the listener to notify them that there is an update; the listener
// is responsible for fetching the new status details. This is because
// status contains disparate information coming from different services,
// and the listener already knows how to gather that information so there
// is no point in duplicating that logic here.
// Note: There is some overlap with channelLayer here, as a new latest
// or verified layer should be sent over that channel as well. However,
// that happens inside the Mesh, at the source. It doesn't currently
// happen here because the status update includes only a layer ID, not
// full layer data, and the Reporter currently has no way to retrieve
// full layer data.
func ReportNodeStatusUpdate() {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
if err := reporter.statusEmitter.Emit(Status{}); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit status update", log.Err(err))
} else {
log.Debug("reported status update")
}
}
}
// ReportResult reports creation or receipt of a new tx receipt.
func ReportResult(rst types.TransactionWithResult) {
if reporter != nil {
if err := reporter.resultsEmitter.Emit(rst); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit tx results", rst.ID, log.Err(err))
}
}
}
// ReportAccountUpdate reports an account whose data has been updated.
func ReportAccountUpdate(a types.Address) {
mu.RLock()
defer mu.RUnlock()
accountEvent := Account{Address: a}
if reporter != nil {
if err := reporter.accountEmitter.Emit(accountEvent); err != nil {
// TODO(nkryuchkov): consider returning an error and log outside the function
log.With().Error("Failed to emit account update", log.String("account", a.String()), log.Err(err))
} else {
log.With().Debug("reported account update", a)
}
}
}
// SubscribeTxs subscribes to new transactions.
func SubscribeTxs() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(Transaction))
if err != nil {
log.With().Panic("Failed to subscribe to transactions")
}
return sub
}
return nil
}
// SubscribeActivations subscribes to activations.
func SubscribeActivations() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(ActivationTx))
if err != nil {
log.With().Panic("Failed to subscribe to activations")
}
return sub
}
return nil
}
// SubscribeLayers subscribes to all layer data.
func SubscribeLayers() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(LayerUpdate))
if err != nil {
log.With().Panic("Failed to subscribe to layers")
}
return sub
}
return nil
}
// SubscribeErrors subscribes to node errors.
func SubscribeErrors() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(NodeError))
if err != nil {
log.With().Panic("Failed to subscribe to errors")
}
return sub
}
return nil
}
// SubscribeStatus subscribes to node status messages.
func SubscribeStatus() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(Status))
if err != nil {
log.With().Panic("Failed to subscribe to status")
}
return sub
}
return nil
}
// SubscribeAccount subscribes to account data updates.
func SubscribeAccount() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(Account))
if err != nil {
log.With().Panic("Failed to subscribe to account updates")
}
return sub
}
return nil
}
// SubscribeRewards subscribes to rewards.
func SubscribeRewards() Subscription {
mu.RLock()
defer mu.RUnlock()
if reporter != nil {
sub, err := reporter.bus.Subscribe(new(types.Reward))
if err != nil {
log.With().Panic("Failed to subscribe to rewards")
}
return sub
}
return nil
}
// SubscribeToLayers is used to track and report automatically every time a
// new layer is reached.
func SubscribeToLayers(ticker LayerClock) {
mu.RLock()
defer mu.RUnlock()
if reporter == nil {
return
}
// This will block, so run in a goroutine
go func() {
next := ticker.CurrentLayer().Add(1)
for {
mu.RLock()
stopChan := reporter.stopChan
mu.RUnlock()
select {
case <-ticker.AwaitLayer(next):
current := ticker.CurrentLayer()
if current.Before(next) {
log.Info("time sync detected, realigning ProposalBuilder")
continue
}
next = current.Add(1)
log.With().Debug("reporter got new layer", current)
ReportNodeStatusUpdate()
case <-stopChan:
return
}
}
}()
}
func SubscribeUserEvents(opts ...SubOpt) (*BufferedSubscription[UserEvent], *Ring[UserEvent], error) {
mu.RLock()
defer mu.RUnlock()
if reporter == nil {
return nil, nil, nil
}
return reporter.subUserEvents(opts...)
}
// The status of a layer
// TODO: this list is woefully inadequate and does not map to reality.
// See https://github.com/spacemeshos/api/issues/144.
const (
LayerStatusTypeUnknown = iota
LayerStatusTypeApproved // approved by Hare
LayerStatusTypeConfirmed // confirmed by Tortoise
LayerStatusTypeApplied // applied to state
)
// LayerUpdate packages up a layer with its status (which a layer does not ordinarily contain).
type LayerUpdate struct {
LayerID types.LayerID
Status int
}
// Field returns a log field. Implements the LoggableField interface.
func (nl LayerUpdate) Field() log.Field {
return log.String("layer", fmt.Sprintf("status: %d, number: %d", nl.Status, nl.LayerID))
}
// NodeError represents an internal error to be reported.
type NodeError struct {
Msg string
Trace string
Level zapcore.Level
}
// TxReceipt represents a transaction receipt.
type TxReceipt struct {
ID types.TransactionID
Result int
GasUsed uint64
Fee uint64
Layer types.LayerID
Index uint32
Address types.Address
}
// Transaction wraps a tx with its layer ID and validity info.
type Transaction struct {
Transaction *types.Transaction
LayerID types.LayerID
Valid bool
}
// ActivationTx wraps *types.VerifiedActivationTx.
type ActivationTx struct {
*types.VerifiedActivationTx
}
// Status indicates status change event.
type Status struct{}
// Account wraps account address.
type Account struct {
types.Address
}
// EventReporter is the struct that receives incoming events and dispatches them.
type EventReporter struct {
bus event.Bus
transactionEmitter event.Emitter
activationEmitter event.Emitter
layerEmitter event.Emitter
errorEmitter event.Emitter
statusEmitter event.Emitter
accountEmitter event.Emitter
rewardEmitter event.Emitter
resultsEmitter event.Emitter
proposalsEmitter event.Emitter
malfeasanceEmitter event.Emitter
events struct {
sync.Mutex
buf *Ring[UserEvent]
emitter event.Emitter
}
stopChan chan struct{}
}
func (r *EventReporter) emitUserEvent(ev UserEvent) error {
r.events.Lock()
defer r.events.Unlock()
r.events.buf.insert(ev)
return r.events.emitter.Emit(ev)
}
func (r *EventReporter) subUserEvents(opts ...SubOpt) (*BufferedSubscription[UserEvent], *Ring[UserEvent], error) {
r.events.Lock()
defer r.events.Unlock()
sub, err := Subscribe[UserEvent](opts...)
if err != nil {
return nil, nil, err
}
buf := r.events.buf.Copy()
return sub, buf, nil
}
func newEventReporter() *EventReporter {
bus := eventbus.NewBus()
transactionEmitter, err := bus.Emitter(new(Transaction))
if err != nil {
log.With().Panic("failed to create transaction emitter", log.Err(err))
}
activationEmitter, err := bus.Emitter(new(ActivationTx))
if err != nil {
log.With().Panic("failed to create activation emitter", log.Err(err))
}
layerEmitter, err := bus.Emitter(new(LayerUpdate))
if err != nil {
log.With().Panic("failed to create layer emitter", log.Err(err))
}
statusEmitter, err := bus.Emitter(new(Status))
if err != nil {
log.With().Panic("failed to create status emitter", log.Err(err))
}
accountEmitter, err := bus.Emitter(new(Account))
if err != nil {
log.With().Panic("failed to create account emitter", log.Err(err))
}
rewardEmitter, err := bus.Emitter(new(types.Reward))
if err != nil {
log.With().Panic("failed to create reward emitter", log.Err(err))
}
resultsEmitter, err := bus.Emitter(new(types.TransactionWithResult))
if err != nil {
log.With().Panic("failed to create receipt emitter", log.Err(err))
}
errorEmitter, err := bus.Emitter(new(NodeError))
if err != nil {
log.With().Panic("failed to create error emitter", log.Err(err))
}
proposalsEmitter, err := bus.Emitter(new(EventProposal))
if err != nil {
log.With().Panic("failed to to create proposal emitter", log.Err(err))
}
eventsEmitter, err := bus.Emitter(new(UserEvent))
if err != nil {
log.With().Panic("failed to to create proposal emitter", log.Err(err))
}
malfeasanceEmitter, err := bus.Emitter(new(EventMalfeasance))
if err != nil {
log.With().Panic("failed to create malfeasance emitter", log.Err(err))
}
reporter := &EventReporter{
bus: bus,
transactionEmitter: transactionEmitter,
activationEmitter: activationEmitter,
layerEmitter: layerEmitter,
statusEmitter: statusEmitter,
accountEmitter: accountEmitter,
rewardEmitter: rewardEmitter,
resultsEmitter: resultsEmitter,
errorEmitter: errorEmitter,
proposalsEmitter: proposalsEmitter,
malfeasanceEmitter: malfeasanceEmitter,
stopChan: make(chan struct{}),
}
reporter.events.buf = newRing[UserEvent](100)
reporter.events.emitter = eventsEmitter
return reporter
}
// CloseEventReporter shuts down the event reporting service and closes open channels.
func CloseEventReporter() {
mu.Lock()
defer mu.Unlock()
if reporter != nil {
if err := reporter.transactionEmitter.Close(); err != nil {
log.With().Panic("failed to close transactionEmitter", log.Err(err))
}
if err := reporter.activationEmitter.Close(); err != nil {
log.With().Panic("failed to close activationEmitter", log.Err(err))
}
if err := reporter.layerEmitter.Close(); err != nil {
log.With().Panic("failed to close layerEmitter", log.Err(err))
}
if err := reporter.errorEmitter.Close(); err != nil {
log.With().Panic("failed to close errorEmitter", log.Err(err))
}
if err := reporter.statusEmitter.Close(); err != nil {
log.With().Panic("failed to close statusEmitter", log.Err(err))
}
if err := reporter.accountEmitter.Close(); err != nil {
log.With().Panic("failed to close accountEmitter", log.Err(err))
}
if err := reporter.rewardEmitter.Close(); err != nil {
log.With().Panic("failed to close rewardEmitter", log.Err(err))
}
if err := reporter.resultsEmitter.Close(); err != nil {
log.With().Panic("failed to close receiptEmitter", log.Err(err))
}
if err := reporter.proposalsEmitter.Close(); err != nil {
log.With().Panic("failed to close propoposalsEmitter", log.Err(err))
}
if err := reporter.malfeasanceEmitter.Close(); err != nil {
log.With().Panic("failed to close malfeasanceEmitter", log.Err(err))
}
close(reporter.stopChan)
reporter = nil
}
}
func newRing[T any](size int) *Ring[T] {
return &Ring[T]{
last: -1,
data: make([]T, size),
}
}
// Ring is an insert only buffer.
type Ring[T any] struct {
data []T
first, last int
}
func (r *Ring[T]) insert(value T) {
last := r.last
r.last++
r.last %= len(r.data)
r.data[r.last] = value
if last != -1 && r.first == r.last {
r.first++
r.first %= len(r.data)
}
}
func (r *Ring[T]) Copy() *Ring[T] {
cp := &Ring[T]{
first: r.first,
last: r.last,
data: make([]T, r.Len()),
}
copy(cp.data, r.data)
return cp
}
func (r *Ring[T]) Len() int {
if r.last == -1 {
return 0
}
if r.first > r.last {
return len(r.data)
}
return r.last - r.first + 1
}
func (r *Ring[T]) Iterate(iter func(val T) bool) {
if r.last == -1 {
return
}
if r.last > r.first {
for i := r.first; i <= r.last; i++ {
if !iter(r.data[i]) {
return
}
}
return
}
for i := r.first; i < len(r.data); i++ {
if !iter(r.data[i]) {
return
}
}
for i := 0; i < r.first; i++ {
if !iter(r.data[i]) {
return
}
}
}