add tests for gs features and custom protocols

gossipsub_feat_test.go

+package pubsub
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/libp2p/go-libp2p-core/protocol"
+)
+
+func TestDefaultGossipSubFeatures(t *testing.T) {
+	if GossipSubDefaultFeatures(GossipSubFeatureMesh, FloodSubID) {
+		t.Fatal("floodsub should not support Mesh")
+	}
+	if !GossipSubDefaultFeatures(GossipSubFeatureMesh, GossipSubID_v10) {
+		t.Fatal("gossipsub-v1.0 should support Mesh")
+	}
+	if !GossipSubDefaultFeatures(GossipSubFeatureMesh, GossipSubID_v11) {
+		t.Fatal("gossipsub-v1.1 should support Mesh")
+	}
+
+	if GossipSubDefaultFeatures(GossipSubFeaturePX, FloodSubID) {
+		t.Fatal("floodsub should not support PX")
+	}
+	if GossipSubDefaultFeatures(GossipSubFeaturePX, GossipSubID_v10) {
+		t.Fatal("gossipsub-v1.0 should not support PX")
+	}
+	if !GossipSubDefaultFeatures(GossipSubFeatureMesh, GossipSubID_v11) {
+		t.Fatal("gossipsub-v1.1 should support PX")
+	}
+}
+
+func TestGossipSubCustomProtocols(t *testing.T) {
+	customsub := protocol.ID("customsub/1.0.0")
+	protos := []protocol.ID{customsub, FloodSubID}
+	features := func(feat GossipSubFeature, proto protocol.ID) bool {
+		if proto == customsub {
+			return true
+		}
+
+		return false
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	hosts := getNetHosts(t, ctx, 3)
+
+	gsubs := getGossipsubs(ctx, hosts[:2], WithGossipSubProtocols(protos, features))
+	fsub := getPubsub(ctx, hosts[2])
+	psubs := append(gsubs, fsub)
+
+	connectAll(t, hosts)
+
+	topic := "test"
+	var subs []*Subscription
+	for _, ps := range psubs {
+		subch, err := ps.Subscribe(topic)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		subs = append(subs, subch)
+	}
+
+	// wait for heartbeats to build mesh
+	time.Sleep(time.Second * 2)
+
+	// check the meshes of the gsubs, the gossipsub meshes should include each other but not the
+	// floddsub peer
+	gsubs[0].eval <- func() {
+		gs := gsubs[0].rt.(*GossipSubRouter)
+
+		_, ok := gs.mesh[topic][hosts[1].ID()]
+		if !ok {
+			t.Fatal("expected gs0 to have gs1 in its mesh")
+		}
+
+		_, ok = gs.mesh[topic][hosts[2].ID()]
+		if ok {
+			t.Fatal("expected gs0 to not have fs in its mesh")
+		}
+	}
+
+	gsubs[1].eval <- func() {
+		gs := gsubs[1].rt.(*GossipSubRouter)
+
+		_, ok := gs.mesh[topic][hosts[0].ID()]
+		if !ok {
+			t.Fatal("expected gs1 to have gs0 in its mesh")
+		}
+
+		_, ok = gs.mesh[topic][hosts[2].ID()]
+		if ok {
+			t.Fatal("expected gs1 to not have fs in its mesh")
+		}
+	}
+
+	// send some messages
+	for i := 0; i < 10; i++ {
+		msg := []byte(fmt.Sprintf("%d it's not quite a floooooood %d", i, i))
+
+		owner := rand.Intn(len(psubs))
+
+		psubs[owner].Publish(topic, msg)
+
+		for _, sub := range subs {
+			got, err := sub.Next(ctx)
+			if err != nil {
+				t.Fatal(sub.err)
+			}
+			if !bytes.Equal(msg, got.Data) {
+				t.Fatal("got wrong message!")
+			}
+		}
+	}
+}