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167 lines
5.1 KiB
167 lines
5.1 KiB
package types
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import (
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"context"
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"fmt"
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cmn "github.com/tendermint/tmlibs/common"
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"github.com/tendermint/tmlibs/log"
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tmpubsub "github.com/tendermint/tmlibs/pubsub"
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)
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const defaultCapacity = 1000
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type EventBusSubscriber interface {
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Subscribe(ctx context.Context, subscriber string, query tmpubsub.Query, out chan<- interface{}) error
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Unsubscribe(ctx context.Context, subscriber string, query tmpubsub.Query) error
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UnsubscribeAll(ctx context.Context, subscriber string) error
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}
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// EventBus is a common bus for all events going through the system. All calls
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// are proxied to underlying pubsub server. All events must be published using
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// EventBus to ensure correct data types.
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type EventBus struct {
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cmn.BaseService
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pubsub *tmpubsub.Server
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}
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// NewEventBus returns a new event bus.
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func NewEventBus() *EventBus {
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return NewEventBusWithBufferCapacity(defaultCapacity)
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}
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// NewEventBusWithBufferCapacity returns a new event bus with the given buffer capacity.
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func NewEventBusWithBufferCapacity(cap int) *EventBus {
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// capacity could be exposed later if needed
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pubsub := tmpubsub.NewServer(tmpubsub.BufferCapacity(cap))
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b := &EventBus{pubsub: pubsub}
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b.BaseService = *cmn.NewBaseService(nil, "EventBus", b)
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return b
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}
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func (b *EventBus) SetLogger(l log.Logger) {
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b.BaseService.SetLogger(l)
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b.pubsub.SetLogger(l.With("module", "pubsub"))
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}
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func (b *EventBus) OnStart() error {
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return b.pubsub.OnStart()
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}
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func (b *EventBus) OnStop() {
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b.pubsub.OnStop()
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}
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func (b *EventBus) Subscribe(ctx context.Context, subscriber string, query tmpubsub.Query, out chan<- interface{}) error {
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return b.pubsub.Subscribe(ctx, subscriber, query, out)
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}
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func (b *EventBus) Unsubscribe(ctx context.Context, subscriber string, query tmpubsub.Query) error {
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return b.pubsub.Unsubscribe(ctx, subscriber, query)
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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) Publish(eventType string, eventData TMEventData) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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b.pubsub.PublishWithTags(ctx, eventData, map[string]interface{}{EventTypeKey: eventType})
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return nil
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}
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//--- block, tx, and vote events
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func (b *EventBus) PublishEventNewBlock(event EventDataNewBlock) error {
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return b.Publish(EventNewBlock, TMEventData{event})
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}
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func (b *EventBus) PublishEventNewBlockHeader(event EventDataNewBlockHeader) error {
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return b.Publish(EventNewBlockHeader, TMEventData{event})
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}
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func (b *EventBus) PublishEventVote(event EventDataVote) error {
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return b.Publish(EventVote, TMEventData{event})
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}
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// PublishEventTx publishes tx event with tags from Result. Note it will add
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// predefined tags (EventTypeKey, TxHashKey). Existing tags with the same names
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// will be overwritten.
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func (b *EventBus) PublishEventTx(event EventDataTx) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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tags := make(map[string]interface{})
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// validate and fill tags from tx result
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for _, tag := range event.Result.Tags {
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// basic validation
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if len(tag.Key) == 0 {
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b.Logger.Info("Got tag with an empty key (skipping)", "tag", tag, "tx", event.Tx)
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continue
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}
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tags[string(tag.Key)] = tag.Value
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}
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// add predefined tags
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logIfTagExists(EventTypeKey, tags, b.Logger)
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tags[EventTypeKey] = EventTx
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logIfTagExists(TxHashKey, tags, b.Logger)
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tags[TxHashKey] = fmt.Sprintf("%X", event.Tx.Hash())
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logIfTagExists(TxHeightKey, tags, b.Logger)
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tags[TxHeightKey] = event.Height
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b.pubsub.PublishWithTags(ctx, TMEventData{event}, tags)
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return nil
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}
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func (b *EventBus) PublishEventProposalHeartbeat(event EventDataProposalHeartbeat) error {
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return b.Publish(EventProposalHeartbeat, TMEventData{event})
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}
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//--- EventDataRoundState events
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func (b *EventBus) PublishEventNewRoundStep(event EventDataRoundState) error {
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return b.Publish(EventNewRoundStep, TMEventData{event})
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}
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func (b *EventBus) PublishEventTimeoutPropose(event EventDataRoundState) error {
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return b.Publish(EventTimeoutPropose, TMEventData{event})
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}
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func (b *EventBus) PublishEventTimeoutWait(event EventDataRoundState) error {
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return b.Publish(EventTimeoutWait, TMEventData{event})
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}
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func (b *EventBus) PublishEventNewRound(event EventDataRoundState) error {
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return b.Publish(EventNewRound, TMEventData{event})
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}
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func (b *EventBus) PublishEventCompleteProposal(event EventDataRoundState) error {
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return b.Publish(EventCompleteProposal, TMEventData{event})
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}
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func (b *EventBus) PublishEventPolka(event EventDataRoundState) error {
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return b.Publish(EventPolka, TMEventData{event})
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}
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func (b *EventBus) PublishEventUnlock(event EventDataRoundState) error {
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return b.Publish(EventUnlock, TMEventData{event})
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}
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func (b *EventBus) PublishEventRelock(event EventDataRoundState) error {
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return b.Publish(EventRelock, TMEventData{event})
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}
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func (b *EventBus) PublishEventLock(event EventDataRoundState) error {
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return b.Publish(EventLock, TMEventData{event})
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}
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func logIfTagExists(tag string, tags map[string]interface{}, logger log.Logger) {
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if value, ok := tags[tag]; ok {
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logger.Error("Found predefined tag (value will be overwritten)", "tag", tag, "value", value)
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}
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}
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