fix: race condition in rendezvous test code

Makefile

@@ -50,6 +50,9 @@ all: build
 
 deps: lint-install
 
+build-with-race:
+	${GOBIN} build -race -tags="${BUILD_TAGS}" $(BUILD_FLAGS) -o build/waku ./cmd/waku
+
 build:
 	${GOBIN} build -tags="${BUILD_TAGS}" $(BUILD_FLAGS) -o build/waku ./cmd/waku
 
@@ -70,7 +73,7 @@ lint:
 	@golangci-lint --exclude=SA1019 run ./... --deadline=5m
 
 test:
-	${GOBIN} test -timeout 300s ./waku/... -coverprofile=${GO_TEST_OUTFILE}.tmp
+	${GOBIN} test -race -timeout 300s ./waku/... -coverprofile=${GO_TEST_OUTFILE}.tmp
 	cat ${GO_TEST_OUTFILE}.tmp | grep -v ".pb.go" > ${GO_TEST_OUTFILE}
 	${GOBIN} tool cover -html=${GO_TEST_OUTFILE} -o ${GO_HTML_COV}
 

waku/v2/rendezvous/rendezvous.go

@@ -91,7 +91,7 @@ func (r *Rendezvous) DiscoverShard(ctx context.Context, rp *RendezvousPoint, clu
 	r.DiscoverWithNamespace(ctx, namespace, rp, numPeers)
 }
 
-// DiscoverWithNamespace is uded to find a number of peers using a custom namespace (usually a pubsub topic)
+// DiscoverWithNamespace is used to find a number of peers using a custom namespace (usually a pubsub topic)
 func (r *Rendezvous) DiscoverWithNamespace(ctx context.Context, namespace string, rp *RendezvousPoint, numPeers int) {
 	rendezvousClient := rvs.NewRendezvousClient(r.host, rp.id)
 

waku/v2/rendezvous/rendezvous_test.go

@@ -5,6 +5,7 @@ import (
 	"crypto/rand"
 	"database/sql"
 	"fmt"
+	"sync"
 	"testing"
 	"time"
 
@@ -19,11 +20,14 @@ import (
 )
 
 type PeerConn struct {
+	sync.RWMutex
 	ch <-chan peermanager.PeerData
 }
 
 func (p *PeerConn) Subscribe(ctx context.Context, ch <-chan peermanager.PeerData) {
+	p.Lock()
 	p.ch = ch
+	p.Unlock()
 }
 
 func NewPeerConn() *PeerConn {
@@ -98,6 +102,8 @@ func TestRendezvous(t *testing.T) {
 	time.Sleep(500 * time.Millisecond)
 
 	timer := time.After(3 * time.Second)
+	myPeerConnector.RLock()
+	defer myPeerConnector.RUnlock()
 	select {
 	case <-timer:
 		require.Fail(t, "no peer discovered")