Fix QoS 1 message delivery after server restart (#427)

Resolved an issue where persisted QoS 1 messages were not correctly loaded
into the appropriate client instance during server startup.

hooks/storage/badger/badger.go

@@ -292,6 +292,7 @@ func (h *Hook) OnRetainMessage(cl *mqtt.Client, pk packets.Packet, r int64) {
 		TopicName:   pk.TopicName,
 		Payload:     pk.Payload,
 		Created:     pk.Created,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		Properties: storage.MessageProperties{
 			PayloadFormat:          props.PayloadFormat,
@@ -319,6 +320,7 @@ func (h *Hook) OnQosPublish(cl *mqtt.Client, pk packets.Packet, sent int64, rese
 	in := &storage.Message{
 		ID:          inflightKey(cl, pk),
 		T:           storage.InflightKey,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		PacketID:    pk.PacketID,
 		FixedHeader: pk.FixedHeader,

hooks/storage/bolt/bolt.go

@@ -260,6 +260,7 @@ func (h *Hook) OnRetainMessage(cl *mqtt.Client, pk packets.Packet, r int64) {
 		TopicName:   pk.TopicName,
 		Payload:     pk.Payload,
 		Created:     pk.Created,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		Properties: storage.MessageProperties{
 			PayloadFormat:          props.PayloadFormat,
@@ -287,6 +288,7 @@ func (h *Hook) OnQosPublish(cl *mqtt.Client, pk packets.Packet, sent int64, rese
 	in := &storage.Message{
 		ID:          inflightKey(cl, pk),
 		T:           storage.InflightKey,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		FixedHeader: pk.FixedHeader,
 		TopicName:   pk.TopicName,

hooks/storage/pebble/pebble.go

@@ -268,6 +268,7 @@ func (h *Hook) OnRetainMessage(cl *mqtt.Client, pk packets.Packet, r int64) {
 		TopicName:   pk.TopicName,
 		Payload:     pk.Payload,
 		Created:     pk.Created,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		Properties: storage.MessageProperties{
 			PayloadFormat:          props.PayloadFormat,
@@ -295,6 +296,7 @@ func (h *Hook) OnQosPublish(cl *mqtt.Client, pk packets.Packet, sent int64, rese
 	in := &storage.Message{
 		ID:          inflightKey(cl, pk),
 		T:           storage.InflightKey,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		PacketID:    pk.PacketID,
 		FixedHeader: pk.FixedHeader,

hooks/storage/redis/redis.go

@@ -287,6 +287,7 @@ func (h *Hook) OnRetainMessage(cl *mqtt.Client, pk packets.Packet, r int64) {
 		TopicName:   pk.TopicName,
 		Payload:     pk.Payload,
 		Created:     pk.Created,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		Properties: storage.MessageProperties{
 			PayloadFormat:          props.PayloadFormat,
@@ -317,6 +318,7 @@ func (h *Hook) OnQosPublish(cl *mqtt.Client, pk packets.Packet, sent int64, rese
 	in := &storage.Message{
 		ID:          inflightKey(cl, pk),
 		T:           storage.InflightKey,
+		Client:      cl.ID,
 		Origin:      pk.Origin,
 		FixedHeader: pk.FixedHeader,
 		TopicName:   pk.TopicName,

hooks/storage/storage.go

@@ -89,6 +89,7 @@ type Message struct {
 	Payload     []byte              `json:"payload"`                 // the message payload (if retained)
 	T           string              `json:"t,omitempty"`             // the data type
 	ID          string              `json:"id,omitempty" storm:"id"` // the storage key
+	Client      string              `json:"client,omitempty"`        // the client id the message is for
 	Origin      string              `json:"origin,omitempty"`        // the id of the client who sent the message
 	TopicName   string              `json:"topic_name,omitempty"`    // the topic the message was sent to (if retained)
 	FixedHeader packets.FixedHeader `json:"fixedheader"`             // the header properties of the message

server.go

@@ -1672,7 +1672,7 @@ func (s *Server) loadClients(v []storage.Client) {
 // loadInflight restores inflight messages from the datastore.
 func (s *Server) loadInflight(v []storage.Message) {
 	for _, msg := range v {
-		if client, ok := s.Clients.Get(msg.Origin); ok {
+		if client, ok := s.Clients.Get(msg.Client); ok {
 			client.State.Inflight.Set(msg.ToPacket())
 		}
 	}

server_test.go

@@ -3416,10 +3416,10 @@ func TestServerLoadInflightMessages(t *testing.T) {
 	require.Equal(t, 3, s.Clients.Len())
 
 	v := []storage.Message{
-		{Origin: "mochi", PacketID: 1, Payload: []byte("hello world"), TopicName: "a/b/c"},
-		{Origin: "mochi", PacketID: 2, Payload: []byte("yes"), TopicName: "a/b/c"},
-		{Origin: "zen", PacketID: 3, Payload: []byte("hello world"), TopicName: "a/b/c"},
-		{Origin: "mochi-co", PacketID: 4, Payload: []byte("hello world"), TopicName: "a/b/c"},
+		{Client: "mochi", Origin: "mochi", PacketID: 1, Payload: []byte("hello world"), TopicName: "a/b/c"},
+		{Client: "mochi", Origin: "mochi", PacketID: 2, Payload: []byte("yes"), TopicName: "a/b/c"},
+		{Client: "zen", Origin: "zen", PacketID: 3, Payload: []byte("hello world"), TopicName: "a/b/c"},
+		{Client: "mochi-co", Origin: "mochi-co", PacketID: 4, Payload: []byte("hello world"), TopicName: "a/b/c"},
 	}
 	s.loadInflight(v)