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finalization_distributor.go
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finalization_distributor.go
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package pubsub
import (
"sync"
"github.com/onflow/flow-go/consensus/hotstuff"
"github.com/onflow/flow-go/consensus/hotstuff/model"
)
type OnBlockFinalizedConsumer = func(block *model.Block)
type OnBlockIncorporatedConsumer = func(block *model.Block)
// FinalizationDistributor ingests events from HotStuff's logic for tracking forks + finalization
// and distributes them to consumers. This logic generally runs inside all nodes (irrespectively whether
// they are active consensus participants or or only consensus followers).
// Concurrently safe.
type FinalizationDistributor struct {
blockFinalizedConsumers []OnBlockFinalizedConsumer
blockIncorporatedConsumers []OnBlockIncorporatedConsumer
consumers []hotstuff.FinalizationConsumer
lock sync.RWMutex
}
var _ hotstuff.FinalizationConsumer = (*FinalizationDistributor)(nil)
func NewFinalizationDistributor() *FinalizationDistributor {
return &FinalizationDistributor{}
}
func (d *FinalizationDistributor) AddOnBlockFinalizedConsumer(consumer OnBlockFinalizedConsumer) {
d.lock.Lock()
defer d.lock.Unlock()
d.blockFinalizedConsumers = append(d.blockFinalizedConsumers, consumer)
}
func (d *FinalizationDistributor) AddOnBlockIncorporatedConsumer(consumer OnBlockIncorporatedConsumer) {
d.lock.Lock()
defer d.lock.Unlock()
d.blockIncorporatedConsumers = append(d.blockIncorporatedConsumers, consumer)
}
func (d *FinalizationDistributor) AddFinalizationConsumer(consumer hotstuff.FinalizationConsumer) {
d.lock.Lock()
defer d.lock.Unlock()
d.consumers = append(d.consumers, consumer)
}
func (d *FinalizationDistributor) OnBlockIncorporated(block *model.Block) {
d.lock.RLock()
defer d.lock.RUnlock()
for _, consumer := range d.blockIncorporatedConsumers {
consumer(block)
}
for _, consumer := range d.consumers {
consumer.OnBlockIncorporated(block)
}
}
func (d *FinalizationDistributor) OnFinalizedBlock(block *model.Block) {
d.lock.RLock()
defer d.lock.RUnlock()
for _, consumer := range d.blockFinalizedConsumers {
consumer(block)
}
for _, consumer := range d.consumers {
consumer.OnFinalizedBlock(block)
}
}