🐛 Resolve the sender panic occurring during concurrent calls

go.mod

@@ -4,12 +4,12 @@ go 1.22.0
 
 require (
 	github.com/bwmarrin/snowflake v0.3.0
-	github.com/cloudevents/sdk-go/protocol/kafka_confluent/v2 v2.0.0-20240413090539-7fef29478991
-	github.com/cloudevents/sdk-go/protocol/mqtt_paho/v2 v2.0.0-20231030012137-0836a524e995
-	github.com/cloudevents/sdk-go/v2 v2.15.3-0.20240329120647-e6a74efbacbf
-	github.com/confluentinc/confluent-kafka-go/v2 v2.3.0
+	github.com/cloudevents/sdk-go/protocol/kafka_confluent/v2 v2.0.0-20240911135016-682f3a9684e4
+	github.com/cloudevents/sdk-go/protocol/mqtt_paho/v2 v2.0.0-20240911135016-682f3a9684e4
+	github.com/cloudevents/sdk-go/v2 v2.15.3-0.20240911135016-682f3a9684e4
+	github.com/confluentinc/confluent-kafka-go/v2 v2.5.3
 	github.com/davecgh/go-spew v1.1.1
-	github.com/eclipse/paho.golang v0.11.0
+	github.com/eclipse/paho.golang v0.12.0
 	github.com/evanphx/json-patch v5.6.0+incompatible
 	github.com/golang/protobuf v1.5.4
 	github.com/google/go-cmp v0.6.0
@@ -21,8 +21,8 @@ require (
 	github.com/openshift/library-go v0.0.0-20240621150525-4bb4238aef81
 	github.com/prometheus/client_golang v1.18.0
 	github.com/prometheus/client_model v0.5.0
-	github.com/stretchr/testify v1.8.4
-	golang.org/x/oauth2 v0.16.0
+	github.com/stretchr/testify v1.9.0
+	golang.org/x/oauth2 v0.17.0
 	google.golang.org/grpc v1.62.1
 	google.golang.org/protobuf v1.33.0
 	gopkg.in/yaml.v2 v2.4.0
@@ -37,7 +37,7 @@ require (
 )
 
 require (
-	cloud.google.com/go/compute v1.23.3 // indirect
+	cloud.google.com/go/compute v1.25.1 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
@@ -52,12 +52,11 @@ require (
 	github.com/google/gnostic-models v0.6.8 // indirect
 	github.com/google/gofuzz v1.2.0 // indirect
 	github.com/gorilla/websocket v1.5.1 // indirect
-	github.com/imdario/mergo v0.3.12 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
 	github.com/josharian/intern v1.0.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
-	github.com/moby/term v0.0.0-20221205130635-1aeaba878587 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
@@ -69,15 +68,15 @@ require (
 	github.com/rs/xid v1.4.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	go.uber.org/multierr v1.11.0 // indirect
-	go.uber.org/zap v1.26.0 // indirect
+	go.uber.org/zap v1.27.0 // indirect
 	golang.org/x/net v0.23.0 // indirect
-	golang.org/x/sync v0.6.0 // indirect
-	golang.org/x/sys v0.18.0 // indirect
-	golang.org/x/term v0.18.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/sys v0.19.0 // indirect
+	golang.org/x/term v0.19.0 // indirect
 	golang.org/x/text v0.14.0 // indirect
-	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/time v0.5.0 // indirect
 	google.golang.org/appengine v1.6.8 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240318140521-94a12d6c2237 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect

pkg/cloudevents/generic/options/mqtt/agentoptions.go

@@ -84,17 +84,22 @@ func (o *mqttAgentOptions) WithContext(ctx context.Context, evtCtx cloudevents.E
 
 func (o *mqttAgentOptions) Protocol(ctx context.Context) (options.CloudEventsProtocol, error) {
 	subscribe := &paho.Subscribe{
-		Subscriptions: map[string]paho.SubscribeOptions{
-			// TODO support multiple sources, currently the client require the source events topic has a sourceID, in
-			// the future, client may need a source list, it will subscribe to each source
-			// receiving the sources events
-			replaceLast(o.Topics.SourceEvents, "+", o.clusterName): {QoS: byte(o.SubQoS)},
+		Subscriptions: []paho.SubscribeOptions{
+			{
+				// TODO support multiple sources, currently the client require the source events topic has a sourceID, in
+				// the future, client may need a source list, it will subscribe to each source
+				// receiving the sources events
+				Topic: replaceLast(o.Topics.SourceEvents, "+", o.clusterName), QoS: byte(o.SubQoS),
+			},
 		},
 	}
 
+	// receiving status resync events from all sources
 	if len(o.Topics.SourceBroadcast) != 0 {
-		// receiving status resync events from all sources
-		subscribe.Subscriptions[o.Topics.SourceBroadcast] = paho.SubscribeOptions{QoS: byte(o.SubQoS)}
+		subscribe.Subscriptions = append(subscribe.Subscriptions, paho.SubscribeOptions{
+			Topic: o.Topics.SourceBroadcast,
+			QoS:   byte(o.SubQoS),
+		})
 	}
 
 	return o.GetCloudEventsProtocol(

pkg/cloudevents/generic/options/mqtt/sourceoptions.go

@@ -82,15 +82,19 @@ func (o *mqttSourceOptions) Protocol(ctx context.Context) (options.CloudEventsPr
 	}
 
 	subscribe := &paho.Subscribe{
-		Subscriptions: map[string]paho.SubscribeOptions{
-			// receiving the agent events
-			o.Topics.AgentEvents: {QoS: byte(o.SubQoS)},
+		Subscriptions: []paho.SubscribeOptions{
+			{
+				Topic: o.Topics.AgentEvents, QoS: byte(o.SubQoS),
+			},
 		},
 	}
 
 	if len(o.Topics.AgentBroadcast) != 0 {
 		// receiving spec resync events from all agents
-		subscribe.Subscriptions[o.Topics.AgentBroadcast] = paho.SubscribeOptions{QoS: byte(o.SubQoS)}
+		subscribe.Subscriptions = append(subscribe.Subscriptions, paho.SubscribeOptions{
+			Topic: o.Topics.AgentBroadcast,
+			QoS:   byte(o.SubQoS),
+		})
 	}
 
 	receiver, err := o.GetCloudEventsProtocol(