status-go/t/helpers/peers.go

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package helpers
import (
"errors"
"time"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/enode"
)
var (
// ErrNoRunningNode node is not running.
ErrNoRunningNode = errors.New("there is no running node")
// ErrEmptyPeerURL provided peer URL is empty
ErrEmptyPeerURL = errors.New("empty peer url")
)
// waitForPeer waits for a peer to be added
func waitForPeer(p *p2p.Server, u string, e p2p.PeerEventType, t time.Duration, subscribed chan struct{}) error {
if p == nil {
return ErrNoRunningNode
}
if u == "" {
return ErrEmptyPeerURL
}
parsedPeer, err := enode.ParseV4(u)
if err != nil {
return err
}
ch := make(chan *p2p.PeerEvent)
subscription := p.SubscribeEvents(ch)
defer subscription.Unsubscribe()
close(subscribed)
for {
select {
case ev := <-ch:
if ev.Type == e && ev.Peer == parsedPeer.ID() {
return nil
}
case err := <-subscription.Err():
if err != nil {
return err
}
case <-time.After(t):
return errors.New("wait for peer: timeout")
}
}
}
// WaitForPeerAsync waits for a peer to be added asynchronously
func WaitForPeerAsync(p *p2p.Server, u string, e p2p.PeerEventType, t time.Duration) <-chan error {
subscribed := make(chan struct{})
errCh := make(chan error)
go func() {
errCh <- waitForPeer(p, u, e, t, subscribed)
}()
<-subscribed
return errCh
}