Update readme and server version

* Small formatting/style changes for filter existed

* Use OnQoSDropped hook instead of onInflightExpired

README.md

@@ -113,6 +113,7 @@ Examples of running the broker with various configurations can be found in the [
 The server comes with a variety of pre-packaged network listeners which allow the broker to accept connections on different protocols. The current listeners are:
 
 - `listeners.NewTCP(...)` - A TCP listener.
+- `listeners.NewUnixSock(...)` - A Unix Socket listener.
 - `listeners.NewWebsocket(...)` A Websocket listener.
 - `listeners.NewHTTPStats(...)` An HTTP $SYS info dashboard.
 - Use the `listeners.Listener` interface to develop new listeners. If you do, please let us know!
@@ -296,7 +297,6 @@ The function signatures for all the hooks and `mqtt.Hook` interface can be found
 | OnWillSent | Called when an LWT message has been issued from a disconnecting client. | 
 | OnClientExpired | Called when a client session has expired and should be deleted. | 
 | OnRetainedExpired | Called when a retained message has expired and should be deleted. | 
-| OnExpireInflights | Called when the server issues a clear request for expired inflight messages.| 
 | StoredClients |  Returns clients, eg. from a persistent store. | 
 | StoredSubscriptions |  Returns client subscriptions, eg. from a persistent store. | 
 | StoredInflightMessages | Returns inflight messages, eg. from a persistent store.  | 

clients.go

@@ -290,17 +290,18 @@ func (cl *Client) ResendInflightMessages(force bool) error {
 }
 
 // ClearInflights deletes all inflight messages for the client, eg. for a disconnected user with a clean session.
-func (cl *Client) ClearInflights(now, maximumExpiry int64) int64 {
-	var deleted int64
+func (cl *Client) ClearInflights(now, maximumExpiry int64) []uint16 {
+	deleted := []uint16{}
 	for _, tk := range cl.State.Inflight.GetAll(false) {
 		if (tk.Expiry > 0 && tk.Expiry < now) || tk.Created+maximumExpiry < now {
 			if ok := cl.State.Inflight.Delete(tk.PacketID); ok {
 				cl.ops.hooks.OnQosDropped(cl, tk)
 				atomic.AddInt64(&cl.ops.info.Inflight, -1)
-				deleted++
+				deleted = append(deleted, uint16(tk.PacketID))
 			}
 		}
 	}
+
 	return deleted
 }
 
@@ -383,6 +384,10 @@ func (cl *Client) ReadFixedHeader(fh *packets.FixedHeader) error {
 		return err
 	}
 
+	if cl.ops.capabilities.MaximumPacketSize > 0 && uint32(fh.Remaining+1) > cl.ops.capabilities.MaximumPacketSize {
+		return packets.ErrPacketTooLarge // [MQTT-3.2.2-15]
+	}
+
 	atomic.AddInt64(&cl.ops.info.BytesReceived, int64(bu+1))
 	return nil
 }
@@ -472,8 +477,8 @@ func (cl *Client) WritePacket(pk packets.Packet) error {
 		pk.Mods.DisallowProblemInfo = true // [MQTT-3.1.2-29] strict, no problem info on any packet if set
 	}
 
-	if cl.Properties.Props.RequestResponseInfo == 0x1 || cl.ops.capabilities.Compatibilities.AlwaysReturnResponseInfo {
-		pk.Mods.AllowResponseInfo = true // NB we need to know which properties we can encode
+	if pk.FixedHeader.Type != packets.Connack || cl.Properties.Props.RequestResponseInfo == 0x1 || cl.ops.capabilities.Compatibilities.AlwaysReturnResponseInfo {
+		pk.Mods.AllowResponseInfo = true // [MQTT-3.1.2-28] we need to know which properties we can encode
 	}
 
 	pk = cl.ops.hooks.OnPacketEncode(cl, pk)

clients_test.go

@@ -272,7 +272,9 @@ func TestClientClearInflights(t *testing.T) {
 	cl.State.Inflight.Set(packets.Packet{PacketID: 7, Created: n})
 	require.Equal(t, 5, cl.State.Inflight.Len())
 
-	cl.ClearInflights(n, 4)
+	deleted := cl.ClearInflights(n, 4)
+	require.Len(t, deleted, 3)
+	require.ElementsMatch(t, []uint16{1, 2, 5}, deleted)
 	require.Equal(t, 2, cl.State.Inflight.Len())
 }
 
@@ -350,6 +352,22 @@ func TestClientReadFixedHeaderDecodeError(t *testing.T) {
 	require.Error(t, err)
 }
 
+func TestClientReadFixedHeaderPacketOversized(t *testing.T) {
+	cl, r, _ := newTestClient()
+	cl.ops.capabilities.MaximumPacketSize = 2
+	defer cl.Stop(errClientStop)
+
+	go func() {
+		r.Write(packets.TPacketData[packets.Publish].Get(packets.TPublishQos1Dup).RawBytes)
+		r.Close()
+	}()
+
+	fh := new(packets.FixedHeader)
+	err := cl.ReadFixedHeader(fh)
+	require.Error(t, err)
+	require.ErrorIs(t, err, packets.ErrPacketTooLarge)
+}
+
 func TestClientReadFixedHeaderReadEOF(t *testing.T) {
 	cl, r, _ := newTestClient()
 	defer cl.Stop(errClientStop)

examples/paho.testing/main.go

@@ -29,7 +29,6 @@ func main() {
 	server.Options.Capabilities.ServerKeepAlive = 60
 	server.Options.Capabilities.Compatibilities.ObscureNotAuthorized = true
 	server.Options.Capabilities.Compatibilities.PassiveClientDisconnect = true
-	server.Options.Capabilities.Compatibilities.AlwaysReturnResponseInfo = true
 
 	_ = server.AddHook(new(pahoAuthHook), nil)
 	tcp := listeners.NewTCP("t1", ":1883", nil)

hooks.go

@@ -47,7 +47,6 @@ const (
 	OnWillSent
 	OnClientExpired
 	OnRetainedExpired
-	OnExpireInflights
 	StoredClients
 	StoredSubscriptions
 	StoredInflightMessages
@@ -96,7 +95,6 @@ type Hook interface {
 	OnWillSent(cl *Client, pk packets.Packet)
 	OnClientExpired(cl *Client)
 	OnRetainedExpired(filter string)
-	OnExpireInflights(cl *Client, expiry int64)
 	StoredClients() ([]storage.Client, error)
 	StoredSubscriptions() ([]storage.Subscription, error)
 	StoredInflightMessages() ([]storage.Message, error)
@@ -351,7 +349,7 @@ func (h *Hooks) OnUnsubscribed(cl *Client, pk packets.Packet) {
 	}
 }
 
-// OnPublish is called when a client publishes a message. This method differs from OnMessage
+// OnPublish is called when a client publishes a message. This method differs from OnPublished
 // in that it allows you to modify you to modify the incoming packet before it is processed.
 // The return values of the hook methods are passed-through in the order the hooks were attached.
 func (h *Hooks) OnPublish(cl *Client, pk packets.Packet) (pkx packets.Packet, err error) {
@@ -414,8 +412,8 @@ func (h *Hooks) OnQosComplete(cl *Client, pk packets.Packet) {
 }
 
 // OnQosDropped is called the Qos flow for a message expires. In other words, when
-// an inflight message expires or is abandoned.
-// It is typically used to delete an inflight message from a store.
+// an inflight message expires or is abandoned. It is typically used to delete an
+// inflight message from a store.
 func (h *Hooks) OnQosDropped(cl *Client, pk packets.Packet) {
 	for _, hook := range h.internal {
 		if hook.Provides(OnQosDropped) {
@@ -601,19 +599,6 @@ func (h *Hooks) OnACLCheck(cl *Client, topic string, write bool) bool {
 	return false
 }
 
-// OnExpireInflights is called when the server issues a clear request for expired
-// inflight messages. Expiry should be the time after which the message is no longer
-// valid (usually some time in the past). A message has expired if it's created time
-// is older than time.Now() minus Inflight TTL. This method can be used to expire
-// old inflight messages in a persistent store which doesnt support per-item TTL.
-func (h *Hooks) OnExpireInflights(cl *Client, expiry int64) {
-	for _, hook := range h.internal {
-		if hook.Provides(OnExpireInflights) {
-			hook.OnExpireInflights(cl, expiry)
-		}
-	}
-}
-
 // HookBase provides a set of default methods for each hook. It should be embedded in
 // all hooks.
 type HookBase struct {
@@ -755,9 +740,6 @@ func (h *HookBase) OnClientExpired(cl *Client) {}
 // OnRetainedExpired is called when a retained message for a topic has expired.
 func (h *HookBase) OnRetainedExpired(topic string) {}
 
-// OnExpireInflights is called when the server issues a clear request for expired inflight messages.
-func (h *HookBase) OnExpireInflights(cl *Client, expiry int64) {}
-
 // StoredClients returns all clients from a store.
 func (h *HookBase) StoredClients() (v []storage.Client, err error) {
 	return

hooks/storage/badger/badger.go

@@ -80,7 +80,6 @@ func (h *Hook) Provides(b byte) bool {
 		mqtt.OnSysInfoTick,
 		mqtt.OnClientExpired,
 		mqtt.OnRetainedExpired,
-		mqtt.OnExpireInflights,
 		mqtt.StoredClients,
 		mqtt.StoredInflightMessages,
 		mqtt.StoredRetainedMessages,
@@ -348,32 +347,13 @@ func (h *Hook) OnSysInfoTick(sys *system.Info) {
 	}
 }
 
-// OnExpireInflights removes all inflight messages which have passed the provided expiry time.
-func (h *Hook) OnExpireInflights(cl *mqtt.Client, expiry int64) {
+// OnRetainedExpired deletes expired retained messages from the store.
+func (h *Hook) OnRetainedExpired(filter string) {
 	if h.db == nil {
 		h.Log.Error().Err(storage.ErrDBFileNotOpen)
 		return
 	}
 
-	var v []storage.Message
-	err := h.db.Find(&v, badgerhold.Where("T").Eq(storage.InflightKey))
-	if err != nil && !errors.Is(err, badgerhold.ErrNotFound) {
-		h.Log.Error().Err(err).Str("client", cl.ID).Msg("failed to read inflight data")
-		return
-	}
-
-	for _, m := range v {
-		if m.Created < expiry || m.Created == 0 {
-			err := h.db.Delete(m.ID, new(storage.Message))
-			if err != nil {
-				h.Log.Error().Err(err).Interface("data", m.ID).Msg("failed to delete inflight message data")
-			}
-		}
-	}
-}
-
-// OnRetainedExpired deletes expired retained messages from the store.
-func (h *Hook) OnRetainedExpired(filter string) {
 	err := h.db.Delete(retainedKey(filter), new(storage.Message))
 	if err != nil {
 		h.Log.Error().Err(err).Str("id", retainedKey(filter)).Msg("failed to delete expired retained message data")
@@ -382,6 +362,11 @@ func (h *Hook) OnRetainedExpired(filter string) {
 
 // OnClientExpired deleted expired clients from the store.
 func (h *Hook) OnClientExpired(cl *mqtt.Client) {
+	if h.db == nil {
+		h.Log.Error().Err(storage.ErrDBFileNotOpen)
+		return
+	}
+
 	err := h.db.Delete(clientKey(cl), new(storage.Client))
 	if err != nil {
 		h.Log.Error().Err(err).Str("id", clientKey(cl)).Msg("failed to delete expired client data")

hooks/storage/badger/badger_test.go

@@ -5,13 +5,11 @@
 package badger
 
 import (
-	"errors"
 	"os"
 	"strings"
 	"testing"
 	"time"
 
-	"github.com/asdine/storm/v3"
 	"github.com/mochi-co/mqtt/v2"
 	"github.com/mochi-co/mqtt/v2/hooks/storage"
 	"github.com/mochi-co/mqtt/v2/packets"
@@ -170,6 +168,21 @@ func TestOnClientExpired(t *testing.T) {
 	require.ErrorIs(t, badgerhold.ErrNotFound, err)
 }
 
+func TestOnClientExpiredNoDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	h.OnClientExpired(client)
+}
+
+func TestOnClientExpiredClosedDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	err := h.Init(nil)
+	require.NoError(t, err)
+	teardown(t, h.config.Path, h)
+	h.OnClientExpired(client)
+}
+
 func TestOnSessionEstablishedNoDB(t *testing.T) {
 	h := new(Hook)
 	h.SetOpts(&logger, nil)
@@ -333,6 +346,21 @@ func TestOnRetainedExpired(t *testing.T) {
 	require.ErrorIs(t, err, badgerhold.ErrNotFound)
 }
 
+func TestOnRetainExpiredNoDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	h.OnRetainedExpired("a/b/c")
+}
+
+func TestOnRetainExpiredClosedDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	err := h.Init(nil)
+	require.NoError(t, err)
+	teardown(t, h.config.Path, h)
+	h.OnRetainedExpired("a/b/c")
+}
+
 func TestOnRetainMessageNoDB(t *testing.T) {
 	h := new(Hook)
 	h.SetOpts(&logger, nil)
@@ -419,48 +447,6 @@ func TestOnQosDroppedNoDB(t *testing.T) {
 	h.OnQosDropped(client, packets.Packet{})
 }
 
-func TestOnExpireInflights(t *testing.T) {
-	h := new(Hook)
-	h.SetOpts(&logger, nil)
-
-	err := h.Init(nil)
-	require.NoError(t, err)
-	defer teardown(t, h.config.Path, h)
-
-	err = h.db.Upsert("i1", &storage.Message{ID: "i1", T: storage.InflightKey, Created: time.Now().Unix() - 1})
-	require.NoError(t, err)
-	err = h.db.Upsert("i2", &storage.Message{ID: "i2", T: storage.InflightKey, Created: time.Now().Unix() - 20})
-	require.NoError(t, err)
-	err = h.db.Upsert("i3", &storage.Message{ID: "i3", T: storage.InflightKey})
-	require.NoError(t, err)
-
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-
-	var v []storage.Message
-	err = h.db.Find(&v, badgerhold.Where("T").Eq(storage.InflightKey))
-	if err != nil && !errors.Is(err, storm.ErrNotFound) {
-		return
-	}
-
-	require.Len(t, v, 1)
-	require.Equal(t, "i1", v[0].ID)
-}
-
-func TestOnExpireInflightsNoDB(t *testing.T) {
-	h := new(Hook)
-	h.SetOpts(&logger, nil)
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-}
-
-func TestOnExpireInflightsClosedDB(t *testing.T) {
-	h := new(Hook)
-	h.SetOpts(&logger, nil)
-	err := h.Init(nil)
-	require.NoError(t, err)
-	teardown(t, h.config.Path, h)
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-}
-
 func TestOnSysInfoTick(t *testing.T) {
 	h := new(Hook)
 	h.SetOpts(&logger, nil)

hooks/storage/bolt/bolt.go

@@ -85,7 +85,6 @@ func (h *Hook) Provides(b byte) bool {
 		mqtt.OnSysInfoTick,
 		mqtt.OnClientExpired,
 		mqtt.OnRetainedExpired,
-		mqtt.OnExpireInflights,
 		mqtt.StoredClients,
 		mqtt.StoredInflightMessages,
 		mqtt.StoredRetainedMessages,
@@ -369,34 +368,13 @@ func (h *Hook) OnSysInfoTick(sys *system.Info) {
 	}
 }
 
-// OnExpireInflights removes all inflight messages which have passed the
-// provided expiry time.
-func (h *Hook) OnExpireInflights(cl *mqtt.Client, expiry int64) {
+// OnRetainedExpired deletes expired retained messages from the store.
+func (h *Hook) OnRetainedExpired(filter string) {
 	if h.db == nil {
 		h.Log.Error().Err(storage.ErrDBFileNotOpen)
 		return
 	}
 
-	var v []storage.Message
-	err := h.db.Find("T", storage.InflightKey, &v)
-	if err != nil && !errors.Is(err, storm.ErrNotFound) {
-		h.Log.Error().Err(err).Str("client", cl.ID).Msg("failed to read inflight data")
-		return
-	}
-
-	for _, m := range v {
-		if m.Created < expiry || m.Created == 0 {
-			err := h.db.DeleteStruct(&storage.Message{ID: m.ID})
-			if err != nil && !errors.Is(err, storm.ErrNotFound) {
-				h.Log.Error().Err(err).Str("client", cl.ID).Msg("failed to clear inflight data")
-				return
-			}
-		}
-	}
-}
-
-// OnRetainedExpired deletes expired retained messages from the store.
-func (h *Hook) OnRetainedExpired(filter string) {
 	if err := h.db.DeleteStruct(&storage.Message{ID: retainedKey(filter)}); err != nil {
 		h.Log.Error().Err(err).Str("id", retainedKey(filter)).Msg("failed to delete retained publish")
 	}
@@ -404,6 +382,11 @@ func (h *Hook) OnRetainedExpired(filter string) {
 
 // OnClientExpired deleted expired clients from the store.
 func (h *Hook) OnClientExpired(cl *mqtt.Client) {
+	if h.db == nil {
+		h.Log.Error().Err(storage.ErrDBFileNotOpen)
+		return
+	}
+
 	err := h.db.DeleteStruct(&storage.Client{ID: clientKey(cl)})
 	if err != nil && !errors.Is(err, storm.ErrNotFound) {
 		h.Log.Error().Err(err).Str("id", clientKey(cl)).Msg("failed to delete expired client")

hooks/storage/bolt/bolt_test.go

@@ -5,7 +5,6 @@
 package bolt
 
 import (
-	"errors"
 	"os"
 	"testing"
 	"time"
@@ -212,6 +211,21 @@ func TestOnClientExpired(t *testing.T) {
 	require.ErrorIs(t, storm.ErrNotFound, err)
 }
 
+func TestOnClientExpiredClosedDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	err := h.Init(nil)
+	require.NoError(t, err)
+	teardown(t, h.config.Path, h)
+	h.OnClientExpired(client)
+}
+
+func TestOnClientExpiredNoDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	h.OnClientExpired(client)
+}
+
 func TestOnDisconnectNoDB(t *testing.T) {
 	h := new(Hook)
 	h.SetOpts(&logger, nil)
@@ -341,6 +355,21 @@ func TestOnRetainedExpired(t *testing.T) {
 	require.Equal(t, storm.ErrNotFound, err)
 }
 
+func TestOnRetainedExpiredClosedDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	err := h.Init(nil)
+	require.NoError(t, err)
+	teardown(t, h.config.Path, h)
+	h.OnRetainedExpired("a/b/c")
+}
+
+func TestOnRetainedExpiredNoDB(t *testing.T) {
+	h := new(Hook)
+	h.SetOpts(&logger, nil)
+	h.OnRetainedExpired("a/b/c")
+}
+
 func TestOnRetainMessageNoDB(t *testing.T) {
 	h := new(Hook)
 	h.SetOpts(&logger, nil)
@@ -427,48 +456,6 @@ func TestOnQosDroppedNoDB(t *testing.T) {
 	h.OnQosDropped(client, packets.Packet{})
 }
 
-func TestOnExpireInflights(t *testing.T) {
-	h := new(Hook)
-	h.SetOpts(&logger, nil)
-
-	err := h.Init(nil)
-	require.NoError(t, err)
-	defer teardown(t, h.config.Path, h)
-
-	err = h.db.Save(&storage.Message{ID: "i1", T: storage.InflightKey, Created: time.Now().Unix() - 1})
-	require.NoError(t, err)
-	err = h.db.Save(&storage.Message{ID: "i2", T: storage.InflightKey, Created: time.Now().Unix() - 20})
-	require.NoError(t, err)
-	err = h.db.Save(&storage.Message{ID: "i3", T: storage.InflightKey})
-	require.NoError(t, err)
-
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-
-	var v []storage.Message
-	err = h.db.Find("T", storage.InflightKey, &v)
-	if err != nil && !errors.Is(err, storm.ErrNotFound) {
-		return
-	}
-
-	require.Len(t, v, 1)
-	require.Equal(t, "i1", v[0].ID)
-}
-
-func TestOnExpireInflightsClosedDB(t *testing.T) {
-	h := new(Hook)
-	h.SetOpts(&logger, nil)
-	err := h.Init(nil)
-	require.NoError(t, err)
-	teardown(t, h.config.Path, h)
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-}
-
-func TestOnExpireInflightsNoDB(t *testing.T) {
-	h := new(Hook)
-	h.SetOpts(&logger, nil)
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-}
-
 func TestOnSysInfoTick(t *testing.T) {
 	h := new(Hook)
 	h.SetOpts(&logger, nil)

hooks/storage/redis/redis.go

@@ -83,7 +83,6 @@ func (h *Hook) Provides(b byte) bool {
 		mqtt.OnSysInfoTick,
 		mqtt.OnClientExpired,
 		mqtt.OnRetainedExpired,
-		mqtt.OnExpireInflights,
 		mqtt.StoredClients,
 		mqtt.StoredInflightMessages,
 		mqtt.StoredRetainedMessages,
@@ -364,37 +363,13 @@ func (h *Hook) OnSysInfoTick(sys *system.Info) {
 	}
 }
 
-// OnExpireInflights removes all inflight messages which have passed the
-// provided expiry time.
-func (h *Hook) OnExpireInflights(cl *mqtt.Client, expiry int64) {
+// OnRetainedExpired deletes expired retained messages from the store.
+func (h *Hook) OnRetainedExpired(filter string) {
 	if h.db == nil {
 		h.Log.Error().Err(storage.ErrDBFileNotOpen)
 		return
 	}
 
-	rows, err := h.db.HGetAll(h.ctx, h.hKey(storage.InflightKey)).Result()
-	if err != nil && !errors.Is(err, redis.Nil) {
-		h.Log.Error().Err(err).Msg("failed to HGetAll inflight data")
-		return
-	}
-
-	for _, row := range rows {
-		var d storage.Message
-		if err = d.UnmarshalBinary([]byte(row)); err != nil {
-			h.Log.Error().Err(err).Str("data", row).Msg("failed to unmarshal inflight message data")
-		}
-
-		if d.Created < expiry || d.Created == 0 {
-			err := h.db.HDel(h.ctx, h.hKey(storage.InflightKey), d.ID).Err()
-			if err != nil {
-				h.Log.Error().Err(err).Str("id", clientKey(cl)).Msg("failed to delete inflight message data")
-			}
-		}
-	}
-}
-
-// OnRetainedExpired deletes expired retained messages from the store.
-func (h *Hook) OnRetainedExpired(filter string) {
 	err := h.db.HDel(h.ctx, h.hKey(storage.RetainedKey), retainedKey(filter)).Err()
 	if err != nil {
 		h.Log.Error().Err(err).Str("id", retainedKey(filter)).Msg("failed to delete retained message data")
@@ -403,6 +378,11 @@ func (h *Hook) OnRetainedExpired(filter string) {
 
 // OnClientExpired deleted expired clients from the store.
 func (h *Hook) OnClientExpired(cl *mqtt.Client) {
+	if h.db == nil {
+		h.Log.Error().Err(storage.ErrDBFileNotOpen)
+		return
+	}
+
 	err := h.db.HDel(h.ctx, h.hKey(storage.ClientKey), clientKey(cl)).Err()
 	if err != nil {
 		h.Log.Error().Err(err).Str("id", clientKey(cl)).Msg("failed to delete expired client")

hooks/storage/redis/redis_test.go

@@ -253,6 +253,22 @@ func TestOnClientExpired(t *testing.T) {
 	require.ErrorIs(t, redis.Nil, err)
 }
 
+func TestOnClientExpiredClosedDB(t *testing.T) {
+	s := miniredis.RunT(t)
+	defer s.Close()
+	h := newHook(t, s.Addr())
+	teardown(t, h)
+	h.OnClientExpired(client)
+}
+
+func TestOnClientExpiredNoDB(t *testing.T) {
+	s := miniredis.RunT(t)
+	defer s.Close()
+	h := newHook(t, s.Addr())
+	h.db = nil
+	h.OnClientExpired(client)
+}
+
 func TestOnDisconnectNoDB(t *testing.T) {
 	s := miniredis.RunT(t)
 	defer s.Close()
@@ -392,6 +408,22 @@ func TestOnRetainedExpired(t *testing.T) {
 	require.ErrorIs(t, err, redis.Nil)
 }
 
+func TestOnRetainedExpiredClosedDB(t *testing.T) {
+	s := miniredis.RunT(t)
+	defer s.Close()
+	h := newHook(t, s.Addr())
+	teardown(t, h)
+	h.OnRetainedExpired("a/b/c")
+}
+
+func TestOnRetainedExpiredNoDB(t *testing.T) {
+	s := miniredis.RunT(t)
+	defer s.Close()
+	h := newHook(t, s.Addr())
+	h.db = nil
+	h.OnRetainedExpired("a/b/c")
+}
+
 func TestOnRetainMessageNoDB(t *testing.T) {
 	s := miniredis.RunT(t)
 	defer s.Close()
@@ -484,60 +516,6 @@ func TestOnQosDroppedNoDB(t *testing.T) {
 	h.OnQosDropped(client, packets.Packet{})
 }
 
-func TestOnExpireInflights(t *testing.T) {
-	s := miniredis.RunT(t)
-	defer s.Close()
-	h := newHook(t, s.Addr())
-	defer teardown(t, h)
-
-	n := time.Now().Unix()
-	err := h.db.HSet(h.ctx, h.hKey(storage.InflightKey), "i1",
-		&storage.Message{ID: "i1", T: storage.InflightKey, Created: n - 1},
-	).Err()
-	require.NoError(t, err)
-
-	err = h.db.HSet(h.ctx, h.hKey(storage.InflightKey), "i2",
-		&storage.Message{ID: "i2", T: storage.InflightKey, Created: n - 20},
-	).Err()
-	require.NoError(t, err)
-
-	err = h.db.HSet(h.ctx, h.hKey(storage.InflightKey), "i3",
-		&storage.Message{ID: "i3", T: storage.InflightKey},
-	).Err()
-	require.NoError(t, err)
-
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-
-	var r []storage.Message
-	rows, err := h.db.HGetAll(h.ctx, h.hKey(storage.InflightKey)).Result()
-	require.NoError(t, err)
-	require.Len(t, rows, 1)
-	for _, row := range rows {
-		var d storage.Message
-		err = d.UnmarshalBinary([]byte(row))
-		require.NoError(t, err)
-		r = append(r, d)
-	}
-	require.Len(t, r, 1)
-	require.Equal(t, "i1", r[0].ID)
-}
-
-func TestOnExpireInflightsClosedDB(t *testing.T) {
-	s := miniredis.RunT(t)
-	defer s.Close()
-	h := newHook(t, s.Addr())
-	teardown(t, h)
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-}
-
-func TestOnExpireInflightsNoDB(t *testing.T) {
-	s := miniredis.RunT(t)
-	defer s.Close()
-	h := newHook(t, s.Addr())
-	h.db = nil
-	h.OnExpireInflights(client, time.Now().Unix()-10)
-}
-
 func TestOnSysInfoTick(t *testing.T) {
 	s := miniredis.RunT(t)
 	defer s.Close()

hooks_test.go

@@ -231,7 +231,6 @@ func TestHooksNonReturns(t *testing.T) {
 			h.OnWillSent(cl, packets.Packet{})
 			h.OnClientExpired(cl)
 			h.OnRetainedExpired("a/b/c")
-			h.OnExpireInflights(cl, time.Now().Unix()-1)
 
 			// on second iteration, check added hook methods
 			err := h.Add(new(modifiedHookBase), nil)

listeners/unixsock.go

@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 mochi-co
+// SPDX-FileContributor: jason@zgwit.com
+
+package listeners
+
+import (
+	"net"
+	"os"
+	"sync"
+	"sync/atomic"
+
+	"github.com/rs/zerolog"
+)
+
+// UnixSock is a listener for establishing client connections on basic UnixSock protocol.
+type UnixSock struct {
+	sync.RWMutex
+	id      string          // the internal id of the listener.
+	address string          // the network address to bind to.
+	listen  net.Listener    // a net.Listener which will listen for new clients.
+	log     *zerolog.Logger // server logger
+	end     uint32          // ensure the close methods are only called once.
+}
+
+// NewUnixSock initialises and returns a new UnixSock listener, listening on an address.
+func NewUnixSock(id, address string) *UnixSock {
+	return &UnixSock{
+		id:      id,
+		address: address,
+	}
+}
+
+// ID returns the id of the listener.
+func (l *UnixSock) ID() string {
+	return l.id
+}
+
+// Address returns the address of the listener.
+func (l *UnixSock) Address() string {
+	return l.address
+}
+
+// Protocol returns the address of the listener.
+func (l *UnixSock) Protocol() string {
+	return "unix"
+}
+
+// Init initializes the listener.
+func (l *UnixSock) Init(log *zerolog.Logger) error {
+	l.log = log
+
+	var err error
+	_ = os.Remove(l.address)
+	l.listen, err = net.Listen("unix", l.address)
+	return err
+}
+
+// Serve starts waiting for new UnixSock connections, and calls the establish
+// connection callback for any received.
+func (l *UnixSock) Serve(establish EstablishFn) {
+	for {
+		if atomic.LoadUint32(&l.end) == 1 {
+			return
+		}
+
+		conn, err := l.listen.Accept()
+		if err != nil {
+			return
+		}
+
+		if atomic.LoadUint32(&l.end) == 0 {
+			go func() {
+				err = establish(l.id, conn)
+				if err != nil {
+					l.log.Warn().Err(err).Send()
+				}
+			}()
+		}
+	}
+}
+
+// Close closes the listener and any client connections.
+func (l *UnixSock) Close(closeClients CloseFn) {
+	l.Lock()
+	defer l.Unlock()
+
+	if atomic.CompareAndSwapUint32(&l.end, 0, 1) {
+		closeClients(l.id)
+	}
+
+	if l.listen != nil {
+		err := l.listen.Close()
+		if err != nil {
+			return
+		}
+	}
+}

listeners/unixsock_test.go

@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: MIT
+// SPDX-FileCopyrightText: 2022 mochi-co
+// SPDX-FileContributor: jason@zgwit.com
+
+package listeners
+
+import (
+	"errors"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+const testUnixAddr = "mochi.sock"
+
+func TestNewUnixSock(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	require.Equal(t, "t1", l.id)
+	require.Equal(t, testUnixAddr, l.address)
+}
+
+func TestUnixSockID(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	require.Equal(t, "t1", l.ID())
+}
+
+func TestUnixSockAddress(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	require.Equal(t, testUnixAddr, l.Address())
+}
+
+func TestUnixSockProtocol(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	require.Equal(t, "unix", l.Protocol())
+}
+
+func TestUnixSockInit(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	err := l.Init(&logger)
+	l.Close(MockCloser)
+	require.NoError(t, err)
+
+	l2 := NewUnixSock("t2", testUnixAddr)
+	err = l2.Init(&logger)
+	l2.Close(MockCloser)
+	require.NoError(t, err)
+}
+
+func TestUnixSockServeAndClose(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	err := l.Init(&logger)
+	require.NoError(t, err)
+
+	o := make(chan bool)
+	go func(o chan bool) {
+		l.Serve(MockEstablisher)
+		o <- true
+	}(o)
+
+	time.Sleep(time.Millisecond)
+
+	var closed bool
+	l.Close(func(id string) {
+		closed = true
+	})
+
+	require.True(t, closed)
+	<-o
+
+	l.Close(MockCloser)      // coverage: close closed
+	l.Serve(MockEstablisher) // coverage: serve closed
+}
+
+func TestUnixSockEstablishThenEnd(t *testing.T) {
+	l := NewUnixSock("t1", testUnixAddr)
+	err := l.Init(&logger)
+	require.NoError(t, err)
+
+	o := make(chan bool)
+	established := make(chan bool)
+	go func() {
+		l.Serve(func(id string, c net.Conn) error {
+			established <- true
+			return errors.New("ending") // return an error to exit immediately
+		})
+		o <- true
+	}()
+
+	time.Sleep(time.Millisecond)
+	net.Dial("unix", l.listen.Addr().String())
+	require.Equal(t, true, <-established)
+	l.Close(MockCloser)
+	<-o
+}

listeners/websocket.go

@@ -7,6 +7,7 @@ package listeners
 import (
 	"context"
 	"errors"
+	"io"
 	"net"
 	"net/http"
 	"sync"
@@ -137,25 +138,35 @@ type wsConn struct {
 }
 
 // Read reads the next span of bytes from the websocket connection and returns the number of bytes read.
-func (ws *wsConn) Read(p []byte) (n int, err error) {
+func (ws *wsConn) Read(p []byte) (int, error) {
 	op, r, err := ws.c.NextReader()
 	if err != nil {
-		return
+		return 0, err
 	}
 
 	if op != websocket.BinaryMessage {
 		err = ErrInvalidMessage
-		return
+		return 0, err
 	}
 
-	return r.Read(p)
+	var n, br int
+	for {
+		br, err = r.Read(p[n:])
+		n += br
+		if err != nil {
+			if err == io.EOF {
+				err = nil
+			}
+			return n, err
+		}
+	}
 }
 
 // Write writes bytes to the websocket connection.
-func (ws *wsConn) Write(p []byte) (n int, err error) {
-	err = ws.c.WriteMessage(websocket.BinaryMessage, p)
+func (ws *wsConn) Write(p []byte) (int, error) {
+	err := ws.c.WriteMessage(websocket.BinaryMessage, p)
 	if err != nil {
-		return
+		return 0, err
 	}
 
 	return len(p), nil

server.go

@@ -26,10 +26,10 @@ import (
 )
 
 const (
-	Version                        = "2.0.0"  // the current server version.
+	Version                        = "2.1.0" // the current server version.
 	defaultSysTopicInterval int64  = 1       // the interval between $SYS topic publishes
-	defaultFanPoolSize      uint64 = 64       // the number of concurrent workers in the pool
-	defaultFanPoolQueueSize uint64 = 32 * 128 // the capacity of each worker queue
+	defaultFanPoolSize      uint64 = 32      // the number of concurrent workers in the pool
+	defaultFanPoolQueueSize uint64 = 1024    // the capacity of each worker queue
 )
 
 var (
@@ -376,7 +376,7 @@ func (s *Server) attachClient(cl *Client, listener string) error {
 	expire := (cl.Properties.ProtocolVersion == 5 && cl.Properties.Props.SessionExpiryIntervalFlag && cl.Properties.Props.SessionExpiryInterval == 0) || (cl.Properties.ProtocolVersion < 5 && cl.Properties.Clean)
 	s.hooks.OnDisconnect(cl, err, expire)
 	if expire {
-		s.unsubscribeClient(cl)
+		s.UnsubscribeClient(cl)
 		cl.ClearInflights(math.MaxInt64, 0)
 		s.Clients.Delete(cl.ID) // [MQTT-4.1.0-2] ![MQTT-3.1.2-23]
 	}
@@ -455,7 +455,7 @@ func (s *Server) inheritClientSession(pk packets.Packet, cl *Client) bool {
 		defer existing.Unlock()
 		s.DisconnectClient(existing, packets.ErrSessionTakenOver)                                 // [MQTT-3.1.4-3]
 		if pk.Connect.Clean || (existing.Properties.Clean && cl.Properties.ProtocolVersion < 5) { // [MQTT-3.1.2-4] [MQTT-3.1.4-4]
-			s.unsubscribeClient(existing)
+			s.UnsubscribeClient(existing)
 			existing.ClearInflights(math.MaxInt64, 0)
 			return false // [MQTT-3.2.2-3]
 		}
@@ -697,6 +697,7 @@ func (s *Server) processPublish(cl *Client, pk packets.Packet) error {
 			s.publishToSubscribers(pk)
 		})
 
+		s.hooks.OnPublished(cl, pk)
 		return nil
 	}
 
@@ -727,8 +728,7 @@ func (s *Server) processPublish(cl *Client, pk packets.Packet) error {
 		s.publishToSubscribers(pk)
 	})
 
-	s.hooks.OnPublish(cl, pk)
-
+	s.hooks.OnPublished(cl, pk)
 	return nil
 }
 
@@ -962,7 +962,7 @@ func (s *Server) processSubscribe(cl *Client, pk packets.Packet) error {
 		code = packets.ErrPacketIdentifierInUse
 	}
 
-	existed := false
+	filterExisted := make([]bool, len(pk.Filters))
 	reasonCodes := make([]byte, len(pk.Filters))
 	for i, sub := range pk.Filters {
 		if code != packets.CodeSuccess {
@@ -978,8 +978,8 @@ func (s *Server) processSubscribe(cl *Client, pk packets.Packet) error {
 		} else if sub.NoLocal && IsSharedFilter(sub.Filter) {
 			reasonCodes[i] = packets.ErrProtocolViolationInvalidSharedNoLocal.Code // [MQTT-3.8.3-4]
 		} else {
-			existed = !s.Topics.Subscribe(cl.ID, sub) // [MQTT-3.8.4-3]
-			if !existed {
+			isNew := s.Topics.Subscribe(cl.ID, sub) // [MQTT-3.8.4-3]
+			if isNew {
 				atomic.AddInt64(&s.Info.Subscriptions, 1)
 			}
 			cl.State.Subscriptions.Add(sub.Filter, sub) // [MQTT-3.2.2-10]
@@ -988,6 +988,7 @@ func (s *Server) processSubscribe(cl *Client, pk packets.Packet) error {
 				sub.Qos = s.Options.Capabilities.MaximumQos // [MQTT-3.2.2-9]
 			}
 
+			filterExisted[i] = !isNew
 			reasonCodes[i] = sub.Qos // [MQTT-3.9.3-1] [MQTT-3.8.4-7]
 		}
 
@@ -1022,7 +1023,7 @@ func (s *Server) processSubscribe(cl *Client, pk packets.Packet) error {
 			continue
 		}
 
-		s.publishRetainedToClient(cl, sub, existed)
+		s.publishRetainedToClient(cl, sub, filterExisted[i])
 	}
 
 	return nil
@@ -1072,14 +1073,20 @@ func (s *Server) processUnsubscribe(cl *Client, pk packets.Packet) error {
 	return cl.WritePacket(ack)
 }
 
-// unsubscribeClient unsubscribes a client from all of their subscriptions.
-func (s *Server) unsubscribeClient(cl *Client) {
-	for k := range cl.State.Subscriptions.GetAll() {
+// UnsubscribeClient unsubscribes a client from all of their subscriptions.
+func (s *Server) UnsubscribeClient(cl *Client) {
+	i := 0
+	filterMap := cl.State.Subscriptions.GetAll()
+	filters := make([]packets.Subscription, len(filterMap))
+	for k, v := range filterMap {
 		cl.State.Subscriptions.Delete(k)
 		if s.Topics.Unsubscribe(k, cl.ID) {
 			atomic.AddInt64(&s.Info.Subscriptions, -1)
 		}
+		filters[i] = v
+		i++
 	}
+	s.hooks.OnUnsubscribed(cl, packets.Packet{Filters: filters})
 }
 
 // processAuth processes an Auth packet.
@@ -1126,12 +1133,15 @@ func (s *Server) DisconnectClient(cl *Client, code packets.Code) error {
 
 	// We already have a code we are using to disconnect the client, so we are not
 	// interested if the write packet fails due to a closed connection (as we are closing it).
-	_ = cl.WritePacket(out)
+	err := cl.WritePacket(out)
 	if !s.Options.Capabilities.Compatibilities.PassiveClientDisconnect {
 		cl.Stop(code)
+		if code.Code >= packets.ErrUnspecifiedError.Code {
+			return code
+		}
 	}
 
-	return code
+	return err
 }
 
 // publishSysTopics publishes the current values to the server $SYS topics.
@@ -1450,8 +1460,10 @@ func (s *Server) clearExpiredRetainedMessages(now int64) {
 // clearExpiredInflights deletes any inflight messages which have expired.
 func (s *Server) clearExpiredInflights(now int64) {
 	for _, client := range s.Clients.GetAll() {
-		if d := client.ClearInflights(now, s.Options.Capabilities.MaximumMessageExpiryInterval); d > 0 {
-			s.hooks.OnExpireInflights(client, now)
+		if deleted := client.ClearInflights(now, s.Options.Capabilities.MaximumMessageExpiryInterval); len(deleted) > 0 {
+			for _, id := range deleted {
+				s.hooks.OnQosDropped(client, packets.Packet{PacketID: id})
+			}
 		}
 	}
 }

server_test.go

@@ -844,7 +844,7 @@ func TestServerUnsubscribeClient(t *testing.T) {
 	s.Topics.Subscribe(cl.ID, pk)
 	subs := s.Topics.Subscribers("a/b/c")
 	require.Equal(t, 1, len(subs.Subscriptions))
-	s.unsubscribeClient(cl)
+	s.UnsubscribeClient(cl)
 	subs = s.Topics.Subscribers("a/b/c")
 	require.Equal(t, 0, len(subs.Subscriptions))
 }
@@ -2291,6 +2291,21 @@ func TestServerRecievePacketDisconnectClientZeroNonZero(t *testing.T) {
 	require.Equal(t, packets.TPacketData[packets.Disconnect].Get(packets.TDisconnectZeroNonZeroExpiry).RawBytes, buf)
 }
 
+func TestServerRecievePacketDisconnectClient(t *testing.T) {
+	s := newServer()
+	cl, r, w := newTestClient()
+
+	go func() {
+		err := s.DisconnectClient(cl, packets.CodeDisconnect)
+		require.NoError(t, err)
+		w.Close()
+	}()
+
+	buf, err := io.ReadAll(r)
+	require.NoError(t, err)
+	require.Equal(t, packets.TPacketData[packets.Disconnect].Get(packets.TDisconnect).RawBytes, buf)
+}
+
 func TestServerProcessPacketDisconnect(t *testing.T) {
 	s := newServer()
 	cl, _, _ := newTestClient()