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244 lines
7.2 KiB
244 lines
7.2 KiB
package eventbus
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/libs/log"
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tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
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"github.com/tendermint/tendermint/libs/service"
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"github.com/tendermint/tendermint/types"
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)
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// Subscription is a proxy interface for a pubsub Subscription.
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type Subscription interface {
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ID() string
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Next(context.Context) (tmpubsub.Message, error)
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}
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// EventBus is a common bus for all events going through the system.
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// It is a type-aware wrapper around an underlying pubsub server.
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// All events should be published via the bus.
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type EventBus struct {
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service.BaseService
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pubsub *tmpubsub.Server
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}
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// NewDefault returns a new event bus with default options.
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func NewDefault(l log.Logger) *EventBus {
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logger := l.With("module", "eventbus")
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pubsub := tmpubsub.NewServer(tmpubsub.BufferCapacity(0),
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func(s *tmpubsub.Server) {
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s.Logger = logger
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})
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b := &EventBus{pubsub: pubsub}
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b.BaseService = *service.NewBaseService(logger, "EventBus", b)
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return b
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}
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func (b *EventBus) OnStart(ctx context.Context) error {
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return b.pubsub.Start(ctx)
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}
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func (b *EventBus) OnStop() {
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if err := b.pubsub.Stop(); err != nil {
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if !errors.Is(err, service.ErrAlreadyStopped) {
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b.pubsub.Logger.Error("error trying to stop eventBus", "error", err)
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}
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}
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}
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func (b *EventBus) NumClients() int {
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return b.pubsub.NumClients()
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}
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func (b *EventBus) NumClientSubscriptions(clientID string) int {
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return b.pubsub.NumClientSubscriptions(clientID)
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}
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// Deprecated: Use SubscribeWithArgs instead.
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func (b *EventBus) Subscribe(ctx context.Context,
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clientID string, query tmpubsub.Query, capacities ...int) (Subscription, error) {
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return b.pubsub.Subscribe(ctx, clientID, query, capacities...)
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}
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func (b *EventBus) SubscribeWithArgs(ctx context.Context, args tmpubsub.SubscribeArgs) (Subscription, error) {
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return b.pubsub.SubscribeWithArgs(ctx, args)
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}
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func (b *EventBus) Unsubscribe(ctx context.Context, args tmpubsub.UnsubscribeArgs) error {
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return b.pubsub.Unsubscribe(ctx, args)
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}
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func (b *EventBus) UnsubscribeAll(ctx context.Context, subscriber string) error {
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return b.pubsub.UnsubscribeAll(ctx, subscriber)
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}
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func (b *EventBus) Observe(ctx context.Context, observe func(tmpubsub.Message) error, queries ...tmpubsub.Query) error {
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return b.pubsub.Observe(ctx, observe, queries...)
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}
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func (b *EventBus) Publish(eventValue string, eventData types.TMEventData) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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tokens := strings.Split(types.EventTypeKey, ".")
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event := abci.Event{
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Type: tokens[0],
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Attributes: []abci.EventAttribute{
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{
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Key: tokens[1],
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Value: eventValue,
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},
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},
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}
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return b.pubsub.PublishWithEvents(ctx, eventData, []abci.Event{event})
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}
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func (b *EventBus) PublishEventNewBlock(data types.EventDataNewBlock) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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events := append(data.ResultBeginBlock.Events, data.ResultEndBlock.Events...)
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// add Tendermint-reserved new block event
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events = append(events, types.EventNewBlock)
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return b.pubsub.PublishWithEvents(ctx, data, events)
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}
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func (b *EventBus) PublishEventNewBlockHeader(data types.EventDataNewBlockHeader) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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events := append(data.ResultBeginBlock.Events, data.ResultEndBlock.Events...)
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// add Tendermint-reserved new block header event
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events = append(events, types.EventNewBlockHeader)
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return b.pubsub.PublishWithEvents(ctx, data, events)
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}
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func (b *EventBus) PublishEventNewEvidence(evidence types.EventDataNewEvidence) error {
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return b.Publish(types.EventNewEvidenceValue, evidence)
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}
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func (b *EventBus) PublishEventVote(data types.EventDataVote) error {
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return b.Publish(types.EventVoteValue, data)
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}
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func (b *EventBus) PublishEventValidBlock(data types.EventDataRoundState) error {
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return b.Publish(types.EventValidBlockValue, data)
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}
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func (b *EventBus) PublishEventBlockSyncStatus(data types.EventDataBlockSyncStatus) error {
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return b.Publish(types.EventBlockSyncStatusValue, data)
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}
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func (b *EventBus) PublishEventStateSyncStatus(data types.EventDataStateSyncStatus) error {
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return b.Publish(types.EventStateSyncStatusValue, data)
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}
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// PublishEventTx publishes tx event with events from Result. Note it will add
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// predefined keys (EventTypeKey, TxHashKey). Existing events with the same keys
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// will be overwritten.
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func (b *EventBus) PublishEventTx(data types.EventDataTx) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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events := data.Result.Events
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// add Tendermint-reserved events
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events = append(events, types.EventTx)
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tokens := strings.Split(types.TxHashKey, ".")
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events = append(events, abci.Event{
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Type: tokens[0],
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Attributes: []abci.EventAttribute{
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{
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Key: tokens[1],
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Value: fmt.Sprintf("%X", types.Tx(data.Tx).Hash()),
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},
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},
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})
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tokens = strings.Split(types.TxHeightKey, ".")
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events = append(events, abci.Event{
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Type: tokens[0],
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Attributes: []abci.EventAttribute{
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{
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Key: tokens[1],
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Value: fmt.Sprintf("%d", data.Height),
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},
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},
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})
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return b.pubsub.PublishWithEvents(ctx, data, events)
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}
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func (b *EventBus) PublishEventNewRoundStep(data types.EventDataRoundState) error {
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return b.Publish(types.EventNewRoundStepValue, data)
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}
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func (b *EventBus) PublishEventTimeoutPropose(data types.EventDataRoundState) error {
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return b.Publish(types.EventTimeoutProposeValue, data)
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}
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func (b *EventBus) PublishEventTimeoutWait(data types.EventDataRoundState) error {
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return b.Publish(types.EventTimeoutWaitValue, data)
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}
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func (b *EventBus) PublishEventNewRound(data types.EventDataNewRound) error {
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return b.Publish(types.EventNewRoundValue, data)
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}
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func (b *EventBus) PublishEventCompleteProposal(data types.EventDataCompleteProposal) error {
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return b.Publish(types.EventCompleteProposalValue, data)
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}
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func (b *EventBus) PublishEventPolka(data types.EventDataRoundState) error {
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return b.Publish(types.EventPolkaValue, data)
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}
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func (b *EventBus) PublishEventUnlock(data types.EventDataRoundState) error {
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return b.Publish(types.EventUnlockValue, data)
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}
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func (b *EventBus) PublishEventRelock(data types.EventDataRoundState) error {
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return b.Publish(types.EventRelockValue, data)
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}
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func (b *EventBus) PublishEventLock(data types.EventDataRoundState) error {
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return b.Publish(types.EventLockValue, data)
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}
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func (b *EventBus) PublishEventValidatorSetUpdates(data types.EventDataValidatorSetUpdates) error {
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return b.Publish(types.EventValidatorSetUpdatesValue, data)
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}
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//-----------------------------------------------------------------------------
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// NopEventBus implements a types.BlockEventPublisher that discards all events.
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type NopEventBus struct{}
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func (NopEventBus) PublishEventNewBlock(types.EventDataNewBlock) error {
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return nil
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}
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func (NopEventBus) PublishEventNewBlockHeader(types.EventDataNewBlockHeader) error {
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return nil
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}
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func (NopEventBus) PublishEventNewEvidence(types.EventDataNewEvidence) error {
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return nil
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}
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func (NopEventBus) PublishEventTx(types.EventDataTx) error {
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return nil
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}
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func (NopEventBus) PublishEventValidatorSetUpdates(types.EventDataValidatorSetUpdates) error {
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return nil
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}
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