status-go/peers/topic_register.go

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package peers
import (
"sync"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/status-im/status-go/discovery"
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)
// Register manages register topic queries
type Register struct {
discovery discovery.Discovery
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topics []discv5.Topic
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wg sync.WaitGroup
quit chan struct{}
}
// NewRegister creates instance of topic register
func NewRegister(discovery discovery.Discovery, topics ...discv5.Topic) *Register {
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return &Register{discovery: discovery, topics: topics}
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}
// Start topic register query for every topic
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func (r *Register) Start() error {
if !r.discovery.Running() {
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return ErrDiscv5NotRunning
}
r.quit = make(chan struct{})
for _, topic := range r.topics {
r.wg.Add(1)
go func(t discv5.Topic) {
log.Debug("v5 register topic", "topic", t)
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if err := r.discovery.Register(string(t), r.quit); err != nil {
log.Error("error registering topic", "topic", t, "error", err)
}
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r.wg.Done()
}(topic)
}
return nil
}
// Stop all register topic queries and waits for them to exit
func (r *Register) Stop() {
if r.quit == nil {
return
}
select {
case <-r.quit:
return
default:
close(r.quit)
}
log.Debug("waiting for register queries to exit")
r.wg.Wait()
}