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270 lines
7.7 KiB
270 lines
7.7 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/tendermint/libs/common"
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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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)
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const defaultCapacity = 0
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type EventBusSubscriber interface {
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Subscribe(ctx context.Context, subscriber string, query tmpubsub.Query, outCapacity ...int) (Subscription, 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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type Subscription interface {
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Out() <-chan tmpubsub.Message
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Cancelled() <-chan struct{}
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Err() 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.Start()
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}
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func (b *EventBus) OnStop() {
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b.pubsub.Stop()
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}
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func (b *EventBus) Subscribe(ctx context.Context, subscriber string, query tmpubsub.Query, outCapacity ...int) (Subscription, error) {
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return b.pubsub.Subscribe(ctx, subscriber, query, outCapacity...)
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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]string{EventTypeKey: eventType})
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return nil
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}
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func (b *EventBus) validateAndStringifyTags(tags []cmn.KVPair, logger log.Logger) map[string]string {
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result := make(map[string]string)
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for _, tag := range tags {
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// basic validation
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if len(tag.Key) == 0 {
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logger.Debug("Got tag with an empty key (skipping)", "tag", tag)
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continue
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}
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result[string(tag.Key)] = string(tag.Value)
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}
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return result
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}
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func (b *EventBus) PublishEventNewBlock(data EventDataNewBlock) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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resultTags := append(data.ResultBeginBlock.Tags, data.ResultEndBlock.Tags...)
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tags := b.validateAndStringifyTags(resultTags, b.Logger.With("block", data.Block.StringShort()))
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// add predefined tags
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logIfTagExists(EventTypeKey, tags, b.Logger)
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tags[EventTypeKey] = EventNewBlock
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b.pubsub.PublishWithTags(ctx, data, tags)
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return nil
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}
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func (b *EventBus) PublishEventNewBlockHeader(data EventDataNewBlockHeader) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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resultTags := append(data.ResultBeginBlock.Tags, data.ResultEndBlock.Tags...)
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// TODO: Create StringShort method for Header and use it in logger.
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tags := b.validateAndStringifyTags(resultTags, b.Logger.With("header", data.Header))
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// add predefined tags
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logIfTagExists(EventTypeKey, tags, b.Logger)
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tags[EventTypeKey] = EventNewBlockHeader
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b.pubsub.PublishWithTags(ctx, data, tags)
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return nil
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}
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func (b *EventBus) PublishEventVote(data EventDataVote) error {
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return b.Publish(EventVote, data)
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}
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func (b *EventBus) PublishEventValidBlock(data EventDataRoundState) error {
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return b.Publish(EventValidBlock, data)
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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(data EventDataTx) error {
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// no explicit deadline for publishing events
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ctx := context.Background()
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tags := b.validateAndStringifyTags(data.Result.Tags, b.Logger.With("tx", data.Tx))
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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", data.Tx.Hash())
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logIfTagExists(TxHeightKey, tags, b.Logger)
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tags[TxHeightKey] = fmt.Sprintf("%d", data.Height)
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b.pubsub.PublishWithTags(ctx, data, tags)
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return nil
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}
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func (b *EventBus) PublishEventNewRoundStep(data EventDataRoundState) error {
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return b.Publish(EventNewRoundStep, data)
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}
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func (b *EventBus) PublishEventTimeoutPropose(data EventDataRoundState) error {
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return b.Publish(EventTimeoutPropose, data)
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}
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func (b *EventBus) PublishEventTimeoutWait(data EventDataRoundState) error {
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return b.Publish(EventTimeoutWait, data)
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}
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func (b *EventBus) PublishEventNewRound(data EventDataNewRound) error {
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return b.Publish(EventNewRound, data)
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}
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func (b *EventBus) PublishEventCompleteProposal(data EventDataCompleteProposal) error {
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return b.Publish(EventCompleteProposal, data)
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}
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func (b *EventBus) PublishEventPolka(data EventDataRoundState) error {
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return b.Publish(EventPolka, data)
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}
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func (b *EventBus) PublishEventUnlock(data EventDataRoundState) error {
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return b.Publish(EventUnlock, data)
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}
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func (b *EventBus) PublishEventRelock(data EventDataRoundState) error {
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return b.Publish(EventRelock, data)
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}
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func (b *EventBus) PublishEventLock(data EventDataRoundState) error {
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return b.Publish(EventLock, data)
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}
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func (b *EventBus) PublishEventValidatorSetUpdates(data EventDataValidatorSetUpdates) error {
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return b.Publish(EventValidatorSetUpdates, data)
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}
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func logIfTagExists(tag string, tags map[string]string, 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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//-----------------------------------------------------------------------------
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type NopEventBus struct{}
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func (NopEventBus) Subscribe(ctx context.Context, subscriber string, query tmpubsub.Query, out chan<- interface{}) error {
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return nil
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}
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func (NopEventBus) Unsubscribe(ctx context.Context, subscriber string, query tmpubsub.Query) error {
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return nil
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}
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func (NopEventBus) UnsubscribeAll(ctx context.Context, subscriber string) error {
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return nil
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}
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func (NopEventBus) PublishEventNewBlock(data EventDataNewBlock) error {
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return nil
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}
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func (NopEventBus) PublishEventNewBlockHeader(data EventDataNewBlockHeader) error {
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return nil
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}
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func (NopEventBus) PublishEventVote(data EventDataVote) error {
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return nil
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}
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func (NopEventBus) PublishEventTx(data EventDataTx) error {
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return nil
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}
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func (NopEventBus) PublishEventNewRoundStep(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventTimeoutPropose(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventTimeoutWait(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventNewRound(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventCompleteProposal(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventPolka(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventUnlock(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventRelock(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventLock(data EventDataRoundState) error {
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return nil
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}
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func (NopEventBus) PublishEventValidatorSetUpdates(data EventDataValidatorSetUpdates) error {
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return nil
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}
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