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package types
import (
"context"
"fmt"
"github.com/tendermint/tendermint/abci/types"
cmn "github.com/tendermint/tendermint/libs/common"
"github.com/tendermint/tendermint/libs/log"
tmpubsub "github.com/tendermint/tendermint/libs/pubsub"
)
const defaultCapacity = 0
type EventBusSubscriber interface {
Subscribe(ctx context.Context, subscriber string, query tmpubsub.Query, outCapacity ...int) (Subscription, error)
Unsubscribe(ctx context.Context, subscriber string, query tmpubsub.Query) error
UnsubscribeAll(ctx context.Context, subscriber string) error
NumClients() int
NumClientSubscriptions(clientID string) int
}
type Subscription interface {
Out() <-chan tmpubsub.Message
Cancelled() <-chan struct{}
Err() 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.Start()
}
func (b *EventBus) OnStop() {
b.pubsub.Stop()
}
func (b *EventBus) NumClients() int {
return b.pubsub.NumClients()
}
func (b *EventBus) NumClientSubscriptions(clientID string) int {
return b.pubsub.NumClientSubscriptions(clientID)
}
func (b *EventBus) Subscribe(
ctx context.Context,
subscriber string,
query tmpubsub.Query,
outCapacity ...int,
) (Subscription, error) {
return b.pubsub.Subscribe(ctx, subscriber, query, outCapacity...)
}
// This method can be used for a local consensus explorer and synchronous
// testing. Do not use for for public facing / untrusted subscriptions!
func (b *EventBus) SubscribeUnbuffered(
ctx context.Context,
subscriber string,
query tmpubsub.Query,
) (Subscription, error) {
return b.pubsub.SubscribeUnbuffered(ctx, subscriber, query)
}
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()
return b.pubsub.PublishWithEvents(ctx, eventData, map[string][]string{EventTypeKey: {eventType}})
}
// validateAndStringifyEvents takes a slice of event objects and creates a
// map of stringified events where each key is composed of the event
// type and each of the event's attributes keys in the form of
// "{event.Type}.{attribute.Key}" and the value is each attribute's value.
func (b *EventBus) validateAndStringifyEvents(events []types.Event, logger log.Logger) map[string][]string {
result := make(map[string][]string)
for _, event := range events {
if len(event.Type) == 0 {
logger.Debug("Got an event with an empty type (skipping)", "event", event)
continue
}
for _, attr := range event.Attributes {
if len(attr.Key) == 0 {
logger.Debug("Got an event attribute with an empty key(skipping)", "event", event)
continue
}
compositeTag := fmt.Sprintf("%s.%s", event.Type, string(attr.Key))
result[compositeTag] = append(result[compositeTag], string(attr.Value))
}
}
return result
}
func (b *EventBus) PublishEventNewBlock(data EventDataNewBlock) error {
// no explicit deadline for publishing events
ctx := context.Background()
resultEvents := append(data.ResultBeginBlock.Events, data.ResultEndBlock.Events...)
events := b.validateAndStringifyEvents(resultEvents, b.Logger.With("block", data.Block.StringShort()))
// add predefined new block event
events[EventTypeKey] = append(events[EventTypeKey], EventNewBlock)
return b.pubsub.PublishWithEvents(ctx, data, events)
}
func (b *EventBus) PublishEventNewBlockHeader(data EventDataNewBlockHeader) error {
// no explicit deadline for publishing events
ctx := context.Background()
resultTags := append(data.ResultBeginBlock.Events, data.ResultEndBlock.Events...)
// TODO: Create StringShort method for Header and use it in logger.
events := b.validateAndStringifyEvents(resultTags, b.Logger.With("header", data.Header))
// add predefined new block header event
events[EventTypeKey] = append(events[EventTypeKey], EventNewBlockHeader)
return b.pubsub.PublishWithEvents(ctx, data, events)
}
func (b *EventBus) PublishEventVote(data EventDataVote) error {
return b.Publish(EventVote, data)
}
func (b *EventBus) PublishEventValidBlock(data EventDataRoundState) error {
return b.Publish(EventValidBlock, data)
}
// 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(data EventDataTx) error {
// no explicit deadline for publishing events
ctx := context.Background()
events := b.validateAndStringifyEvents(data.Result.Events, b.Logger.With("tx", data.Tx))
// add predefined tags
events[EventTypeKey] = append(events[EventTypeKey], EventTx)
events[TxHashKey] = append(events[TxHashKey], fmt.Sprintf("%X", data.Tx.Hash()))
events[TxHeightKey] = append(events[TxHeightKey], fmt.Sprintf("%d", data.Height))
return b.pubsub.PublishWithEvents(ctx, data, events)
}
func (b *EventBus) PublishEventNewRoundStep(data EventDataRoundState) error {
return b.Publish(EventNewRoundStep, data)
}
func (b *EventBus) PublishEventTimeoutPropose(data EventDataRoundState) error {
return b.Publish(EventTimeoutPropose, data)
}
func (b *EventBus) PublishEventTimeoutWait(data EventDataRoundState) error {
return b.Publish(EventTimeoutWait, data)
}
func (b *EventBus) PublishEventNewRound(data EventDataNewRound) error {
return b.Publish(EventNewRound, data)
}
func (b *EventBus) PublishEventCompleteProposal(data EventDataCompleteProposal) error {
return b.Publish(EventCompleteProposal, data)
}
func (b *EventBus) PublishEventPolka(data EventDataRoundState) error {
return b.Publish(EventPolka, data)
}
func (b *EventBus) PublishEventUnlock(data EventDataRoundState) error {
return b.Publish(EventUnlock, data)
}
func (b *EventBus) PublishEventRelock(data EventDataRoundState) error {
return b.Publish(EventRelock, data)
}
func (b *EventBus) PublishEventLock(data EventDataRoundState) error {
return b.Publish(EventLock, data)
}
func (b *EventBus) PublishEventValidatorSetUpdates(data EventDataValidatorSetUpdates) error {
return b.Publish(EventValidatorSetUpdates, data)
}
//-----------------------------------------------------------------------------
type NopEventBus struct{}
func (NopEventBus) Subscribe(
ctx context.Context,
subscriber string,
query tmpubsub.Query,
out chan<- interface{},
) error {
return nil
}
func (NopEventBus) Unsubscribe(ctx context.Context, subscriber string, query tmpubsub.Query) error {
return nil
}
func (NopEventBus) UnsubscribeAll(ctx context.Context, subscriber string) error {
return nil
}
func (NopEventBus) PublishEventNewBlock(data EventDataNewBlock) error {
return nil
}
func (NopEventBus) PublishEventNewBlockHeader(data EventDataNewBlockHeader) error {
return nil
}
func (NopEventBus) PublishEventVote(data EventDataVote) error {
return nil
}
func (NopEventBus) PublishEventTx(data EventDataTx) error {
return nil
}
func (NopEventBus) PublishEventNewRoundStep(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventTimeoutPropose(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventTimeoutWait(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventNewRound(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventCompleteProposal(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventPolka(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventUnlock(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventRelock(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventLock(data EventDataRoundState) error {
return nil
}
func (NopEventBus) PublishEventValidatorSetUpdates(data EventDataValidatorSetUpdates) error {
return nil
}