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