Merge pull request #155 from remicorniere/Stream_Management_Patch

Stream Management

CHANGELOG.md

@@ -1,5 +1,21 @@
 # Fluux XMPP Changelog
 
+## v0.5.0
+
+### Changes
+
+- Added support for XEP-0198 (Stream management)
+- Added message queue : when using "SendX" methods on a client, messages are also stored in a queue. When requesting
+acks from the server, sent messages will be discarded, and unsent ones will be sent again. (see https://xmpp.org/extensions/xep-0198.html#acking)
+- Added support for stanza_errors (see https://xmpp.org/rfcs/rfc3920.html#def C.2.  Stream error namespace and https://xmpp.org/rfcs/rfc6120.html#schemas-streamerror)
+- Added separate hooks for connection and reconnection on the client. One can now specify different actions to get triggered on client connect 
+and reconnect, at client init time.
+- Client state update is now thread safe
+- Changed the Config struct to use pointer semantics
+- Tests
+- Refactoring, including removing some Fprintf statements in favor of Marshal + Write and using structs from the library
+instead of strings
+
 ## v0.4.0
 
 ### Changes

_examples/go.sum

@@ -99,7 +99,9 @@ github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/9
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/processone/mpg123 v1.0.0 h1:o2WOyGZRM255or1Zc/LtF/jARn51B+9aQl72Qace0GA=
 github.com/processone/mpg123 v1.0.0/go.mod h1:X/FeL+h8vD1bYsG9tIWV3M2c4qNTZOficyvPVBP08go=
+github.com/processone/soundcloud v1.0.0 h1:/+i6+Yveb7Y6IFGDSkesYI+HddblzcRTQClazzVHxoE=
 github.com/processone/soundcloud v1.0.0/go.mod h1:kDLeWpkRtN3C8kIReQdxoiRi92P9xR6yW6qLOJnNWfY=
 github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=
 github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDft0ttaMvbicHlPoso=
@@ -155,6 +157,7 @@ golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73r
 golang.org/x/net v0.0.0-20190110200230-915654e7eabc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190522155817-f3200d17e092/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=

_examples/xmpp_echo/xmpp_echo.go

@@ -28,7 +28,7 @@ func main() {
 	router := xmpp.NewRouter()
 	router.HandleFunc("message", handleMessage)
 
-	client, err := xmpp.NewClient(config, router, errorHandler)
+	client, err := xmpp.NewClient(&config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}

_examples/xmpp_jukebox/xmpp_jukebox.go

@@ -54,7 +54,7 @@ func main() {
 			handleIQ(s, p, player)
 		})
 
-	client, err := xmpp.NewClient(config, router, errorHandler)
+	client, err := xmpp.NewClient(&config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}

_examples/xmpp_oauth2/xmpp_oauth2.go

@@ -28,7 +28,7 @@ func main() {
 	router := xmpp.NewRouter()
 	router.HandleFunc("message", handleMessage)
 
-	client, err := xmpp.NewClient(config, router, errorHandler)
+	client, err := xmpp.NewClient(&config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}

_examples/xmpp_pubsub_client/xmpp_ps_client.go

@@ -38,7 +38,7 @@ func main() {
 			log.Println("Received a message ! => \n" + string(data))
 		})
 
-	client, err := xmpp.NewClient(config, router, func(err error) { log.Println(err) })
+	client, err := xmpp.NewClient(&config, router, func(err error) { log.Println(err) })
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}

_examples/xmpp_websocket/xmpp_websocket.go

@@ -26,7 +26,7 @@ func main() {
 	router := xmpp.NewRouter()
 	router.HandleFunc("message", handleMessage)
 
-	client, err := xmpp.NewClient(config, router, errorHandler)
+	client, err := xmpp.NewClient(&config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}

auth.go

@@ -60,10 +60,21 @@ func authPlain(socket io.ReadWriter, decoder *xml.Decoder, mech string, user str
 	raw := "\x00" + user + "\x00" + secret
 	enc := make([]byte, base64.StdEncoding.EncodedLen(len(raw)))
 	base64.StdEncoding.Encode(enc, []byte(raw))
-	_, err := fmt.Fprintf(socket, "<auth xmlns='%s' mechanism='%s'>%s</auth>", stanza.NSSASL, mech, enc)
+
+	a := stanza.SASLAuth{
+		Mechanism: mech,
+		Value:     string(enc),
+	}
+	data, err := xml.Marshal(a)
 	if err != nil {
 		return err
 	}
+	n, err := socket.Write(data)
+	if err != nil {
+		return err
+	} else if n == 0 {
+		return errors.New("failed to write authSASL nonza to socket : wrote 0 bytes")
+	}
 
 	// Next message should be either success or failure.
 	val, err := stanza.NextPacket(decoder)

client.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"io"
 	"net"
+	"sync"
 	"time"
 
 	"gosrc.io/xmpp/stanza"
@@ -14,15 +15,36 @@ import (
 //=============================================================================
 // EventManager
 
-// ConnState represents the current connection state.
+// SyncConnState represents the current connection state.
+type SyncConnState struct {
+	sync.RWMutex
+	// Current state of the client. Please use the dedicated getter and setter for this field as they are thread safe.
+	state ConnState
+}
 type ConnState = uint8
 
+// getState is a thread-safe getter for the current state
+func (scs *SyncConnState) getState() ConnState {
+	var res ConnState
+	scs.RLock()
+	res = scs.state
+	scs.RUnlock()
+	return res
+}
+
+// setState is a thread-safe setter for the current
+func (scs *SyncConnState) setState(cs ConnState) {
+	scs.Lock()
+	scs.state = cs
+	scs.Unlock()
+}
+
 // This is a the list of events happening on the connection that the
 // client can be notified about.
 const (
 	InitialPresence             = "<presence/>"
 	StateDisconnected ConnState = iota
-	StateConnected
+	StateResuming
 	StateSessionEstablished
 	StateStreamError
 	StatePermanentError
@@ -31,7 +53,7 @@ const (
 // Event is a structure use to convey event changes related to client state. This
 // is for example used to notify the client when the client get disconnected.
 type Event struct {
-	State       ConnState
+	State       SyncConnState
 	Description string
 	StreamError string
 	SMState     SMState
@@ -44,7 +66,16 @@ type SMState struct {
 	Id string
 	// Inbound stanza count
 	Inbound uint
-	// TODO Store location for IP affinity
+
+	// IP affinity
+	preferredReconAddr string
+
+	// Error
+	StreamErrorGroup stanza.StanzaErrorGroup
+
+	// Track sent stanzas
+	*stanza.UnAckQueue
+
 	// TODO Store max and timestamp, to check if we should retry resumption or not
 }
 
@@ -53,29 +84,35 @@ type SMState struct {
 type EventHandler func(Event) error
 
 type EventManager struct {
-	// Store current state
+	// Store current state. Please use "getState" and "setState" to access and/or modify this.
-	CurrentState ConnState
+	CurrentState SyncConnState
 
 	// Callback used to propagate connection state changes
 	Handler EventHandler
 }
 
+// updateState changes the CurrentState in the event manager. The state read is threadsafe but there is no guarantee
+// regarding the triggered callback function.
 func (em *EventManager) updateState(state ConnState) {
-	em.CurrentState = state
+	em.CurrentState.setState(state)
 	if em.Handler != nil {
 		em.Handler(Event{State: em.CurrentState})
 	}
 }
 
+// disconnected changes the CurrentState in the event manager to "disconnected". The state read is threadsafe but there is no guarantee
+// regarding the triggered callback function.
 func (em *EventManager) disconnected(state SMState) {
-	em.CurrentState = StateDisconnected
+	em.CurrentState.setState(StateDisconnected)
 	if em.Handler != nil {
 		em.Handler(Event{State: em.CurrentState, SMState: state})
 	}
 }
 
+// streamError changes the CurrentState in the event manager to "streamError". The state read is threadsafe but there is no guarantee
+// regarding the triggered callback function.
 func (em *EventManager) streamError(error, desc string) {
-	em.CurrentState = StateStreamError
+	em.CurrentState.setState(StateStreamError)
 	if em.Handler != nil {
 		em.Handler(Event{State: em.CurrentState, StreamError: error, Description: desc})
 	}
@@ -90,7 +127,7 @@ var ErrCanOnlySendGetOrSetIq = errors.New("SendIQ can only send get and set IQ s
 // server.
 type Client struct {
 	// Store user defined options and states
-	config Config
+	config *Config
 	// Session gather data that can be accessed by users of this library
 	Session   *Session
 	transport Transport
@@ -100,6 +137,12 @@ type Client struct {
 	EventManager
 	// Handle errors from client execution
 	ErrorHandler func(error)
+
+	// Post connection hook. This will be executed on first connection
+	PostConnectHook func() error
+
+	// Post resume hook. This will be executed after the client resumes a lost connection using StreamManagement (XEP-0198)
+	PostResumeHook func() error
 }
 
 /*
@@ -107,9 +150,9 @@ Setting up the client / Checking the parameters
 */
 
 // NewClient generates a new XMPP client, based on Config passed as parameters.
-// If host is not specified, the DNS SRV should be used to find the host from the domainpart of the Jid.
+// If host is not specified, the DNS SRV should be used to find the host from the domain part of the Jid.
 // Default the port to 5222.
-func NewClient(config Config, r *Router, errorHandler func(error)) (c *Client, err error) {
+func NewClient(config *Config, r *Router, errorHandler func(error)) (c *Client, err error) {
 	if config.KeepaliveInterval == 0 {
 		config.KeepaliveInterval = time.Second * 30
 	}
@@ -169,26 +212,45 @@ func NewClient(config Config, r *Router, errorHandler func(error)) (c *Client, e
 	return
 }
 
-// Connect triggers actual TCP connection, based on previously defined parameters.
+// Connect establishes a first time connection to a XMPP server.
-// Connect simply triggers resumption, with an empty session state.
+// It calls the PostConnectHook
 func (c *Client) Connect() error {
-	var state SMState
+	err := c.connect()
-	return c.Resume(state)
+	if err != nil {
+		return err
+	}
+	// TODO: Do we always want to send initial presence automatically ?
+	// Do we need an option to avoid that or do we rely on client to send the presence itself ?
+	err = c.sendWithWriter(c.transport, []byte(InitialPresence))
+	// Execute the post first connection hook. Typically this holds "ask for roster" and this type of actions.
+	if c.PostConnectHook != nil {
+		err = c.PostConnectHook()
+		if err != nil {
+			return err
+		}
+	}
+
+	// Start the keepalive go routine
+	keepaliveQuit := make(chan struct{})
+	go keepalive(c.transport, c.config.KeepaliveInterval, keepaliveQuit)
+	// Start the receiver go routine
+	go c.recv(keepaliveQuit)
+	return err
 }
 
-// Resume attempts resuming  a Stream Managed session, based on the provided stream management
+// connect establishes an actual TCP connection, based on previously defined parameters, as well as a XMPP session
-// state.
+func (c *Client) connect() error {
-func (c *Client) Resume(state SMState) error {
+	var state SMState
 	var err error
-
+	// This is the TCP connection
 	streamId, err := c.transport.Connect()
 	if err != nil {
 		return err
 	}
-	c.updateState(StateConnected)
 
-	// Client is ok, we now open XMPP session
+	// Client is ok, we now open XMPP session with TLS negotiation if possible and session resume or binding
-	if c.Session, err = NewSession(c.transport, c.config, state); err != nil {
+	// depending on state.
+	if c.Session, err = NewSession(c, state); err != nil {
 		// Try to get the stream close tag from the server.
 		go func() {
 			for {
@@ -212,22 +274,26 @@ func (c *Client) Resume(state SMState) error {
 	c.Session.StreamId = streamId
 	c.updateState(StateSessionEstablished)
 
-	// Start the keepalive go routine
-	keepaliveQuit := make(chan struct{})
-	go keepalive(c.transport, c.config.KeepaliveInterval, keepaliveQuit)
-	// Start the receiver go routine
-	state = c.Session.SMState
-	go c.recv(state, keepaliveQuit)
-
-	// We're connected and can now receive and send messages.
-	//fmt.Fprintf(client.conn, "<presence xml:lang='en'><show>%s</show><status>%s</status></presence>", "chat", "Online")
-	// TODO: Do we always want to send initial presence automatically ?
-	// Do we need an option to avoid that or do we rely on client to send the presence itself ?
-	err = c.sendWithWriter(c.transport, []byte(InitialPresence))
-
 	return err
 }
 
+// Resume attempts resuming  a Stream Managed session, based on the provided stream management
+// state. See XEP-0198
+func (c *Client) Resume() error {
+	c.EventManager.updateState(StateResuming)
+	err := c.connect()
+	if err != nil {
+		return err
+	}
+	// Execute post reconnect hook. This can be different from the first connection hook, and not trigger roster retrival
+	// for example.
+	if c.PostResumeHook != nil {
+		err = c.PostResumeHook()
+	}
+	return err
+}
+
+// Disconnect disconnects the client from the server, sending a stream close nonza and closing the TCP connection.
 func (c *Client) Disconnect() error {
 	if c.transport != nil {
 		return c.transport.Close()
@@ -252,6 +318,15 @@ func (c *Client) Send(packet stanza.Packet) error {
 		return errors.New("cannot marshal packet " + err.Error())
 	}
 
+	// Store stanza as non-acked as part of stream management
+	// See https://xmpp.org/extensions/xep-0198.html#scenarios
+	if c.config.StreamManagementEnable {
+		if _, ok := packet.(stanza.SMRequest); !ok {
+			toStore := stanza.UnAckedStz{Stz: string(data)}
+			c.Session.SMState.UnAckQueue.Push(&toStore)
+		}
+	}
+
 	return c.sendWithWriter(c.transport, data)
 }
 
@@ -284,6 +359,12 @@ func (c *Client) SendRaw(packet string) error {
 		return errors.New("client is not connected")
 	}
 
+	// Store stanza as non-acked as part of stream management
+	// See https://xmpp.org/extensions/xep-0198.html#scenarios
+	if c.config.StreamManagementEnable {
+		toStore := stanza.UnAckedStz{Stz: packet}
+		c.Session.SMState.UnAckQueue.Push(&toStore)
+	}
 	return c.sendWithWriter(c.transport, []byte(packet))
 }
 
@@ -297,13 +378,13 @@ func (c *Client) sendWithWriter(writer io.Writer, packet []byte) error {
 // Go routines
 
 // Loop: Receive data from server
-func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
+func (c *Client) recv(keepaliveQuit chan<- struct{}) {
 	for {
 		val, err := stanza.NextPacket(c.transport.GetDecoder())
 		if err != nil {
 			c.ErrorHandler(err)
 			close(keepaliveQuit)
-			c.disconnected(state)
+			c.disconnected(c.Session.SMState)
 			return
 		}
 
@@ -321,7 +402,7 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
 			answer := stanza.SMAnswer{XMLName: xml.Name{
 				Space: stanza.NSStreamManagement,
 				Local: "a",
-			}, H: state.Inbound}
+			}, H: c.Session.SMState.Inbound}
 			err = c.Send(answer)
 			if err != nil {
 				c.ErrorHandler(err)
@@ -332,7 +413,7 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
 			c.transport.ReceivedStreamClose()
 			return
 		default:
-			state.Inbound++
+			c.Session.SMState.Inbound++
 		}
 		// Do normal route processing in a go-routine so we can immediately
 		// start receiving other stanzas. This also allows route handlers to

client_internal_test.go

@@ -2,7 +2,16 @@ package xmpp
 
 import (
 	"bytes"
+	"encoding/xml"
+	"fmt"
+	"gosrc.io/xmpp/stanza"
+	"strconv"
 	"testing"
+	"time"
+)
+
+const (
+	streamManagementID = "test-stream_management-id"
 )
 
 func TestClient_Send(t *testing.T) {
@@ -17,3 +26,583 @@ func TestClient_Send(t *testing.T) {
 		t.Errorf("Incorrect value sent to buffer: '%s'", buffer.String())
 	}
 }
+
+// Stream management test.
+// Connection is established, then the server sends supported features and so on.
+// After the bind, client attempts a stream management enablement, and server replies in kind.
+func Test_StreamManagement(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+
+	client, mock := initSrvCliForResumeTests(t, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		enableStreamManagement(t, sc, false, true)
+		serverDone <- struct{}{}
+	}, testClientStreamManagement, true, true)
+	go func() {
+		var state SMState
+		var err error
+		// Client is ok, we now open XMPP session
+		if client.Session, err = NewSession(client, state); err != nil {
+			t.Fatalf("failed to open XMPP session: %s", err)
+		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, clientDone)
+	waitForEntity(t, serverDone)
+	mock.Stop()
+}
+
+// Absence of stream management test.
+// Connection is established, then the server sends supported features and so on.
+// Client has stream management disabled in its config, and should not ask for it. Server is not set up to reply.
+func Test_NoStreamManagement(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+
+	// Setup Mock server
+	client, mock := initSrvCliForResumeTests(t, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)         // Reset stream
+		sendFeaturesNoStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		serverDone <- struct{}{}
+	}, testClientStreamManagement, true, false)
+
+	go func() {
+		var state SMState
+
+		// Client is ok, we now open XMPP session
+		var err error
+		if client.Session, err = NewSession(client, state); err != nil {
+			t.Fatalf("failed to open XMPP session: %s", err)
+		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, clientDone)
+	waitForEntity(t, serverDone)
+
+	mock.Stop()
+}
+
+func Test_StreamManagementNotSupported(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+
+	client, mock := initSrvCliForResumeTests(t, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)         // Reset stream
+		sendFeaturesNoStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		serverDone <- struct{}{}
+	}, testClientStreamManagement, true, true)
+
+	go func() {
+		var state SMState
+		var err error
+		// Client is ok, we now open XMPP session
+		if client.Session, err = NewSession(client, state); err != nil {
+			t.Fatalf("failed to open XMPP session: %s", err)
+		}
+		clientDone <- struct{}{}
+	}()
+
+	// Wait for client
+	waitForEntity(t, clientDone)
+
+	// Check if client got a positive stream management response from the server
+	if client.Session.Features.DoesStreamManagement() {
+		t.Fatalf("server does not provide stream management")
+	}
+
+	// Wait for server
+	waitForEntity(t, serverDone)
+	mock.Stop()
+}
+
+func Test_StreamManagementNoResume(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+
+	client, mock := initSrvCliForResumeTests(t, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		enableStreamManagement(t, sc, false, false)
+		serverDone <- struct{}{}
+	}, testClientStreamManagement, true, true)
+
+	go func() {
+		var state SMState
+		var err error
+		// Client is ok, we now open XMPP session
+		if client.Session, err = NewSession(client, state); err != nil {
+			t.Fatalf("failed to open XMPP session: %s", err)
+		}
+		clientDone <- struct{}{}
+	}()
+	waitForEntity(t, clientDone)
+	if IsStreamResumable(client) {
+		t.Fatalf("server does not support resumption but client says stream is resumable")
+	}
+	waitForEntity(t, serverDone)
+	mock.Stop()
+}
+
+func Test_StreamManagementResume(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		enableStreamManagement(t, sc, false, true)
+		discardPresence(t, sc)
+		serverDone <- struct{}{}
+	})
+
+	// Test / Check result
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testXMPPAddress,
+		},
+		Jid:                    "test@localhost",
+		Credential:             Password("test"),
+		Insecure:               true,
+		StreamManagementEnable: true,
+		streamManagementResume: true} // Enable stream management
+
+	var client *Client
+	router := NewRouter()
+	client, err := NewClient(&config, router, clientDefaultErrorHandler)
+	if err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	// =================================================================
+	// Connect client, then disconnect it so we can resume the session
+	go func() {
+		err = client.Connect()
+		if err != nil {
+			t.Fatalf("could not connect client to mock server: %s", err)
+		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, clientDone)
+
+	// ===========================================================================================
+	// Check that the client correctly went into "disconnected" state, after being disconnected
+	statusCorrectChan := make(chan struct{})
+	kill := make(chan struct{})
+
+	transp, ok := client.transport.(*XMPPTransport)
+	if !ok {
+		t.Fatalf("problem with client transport ")
+	}
+
+	transp.conn.Close()
+
+	waitForEntity(t, serverDone)
+	mock.Stop()
+
+	go checkClientResumeStatus(client, statusCorrectChan, kill)
+	select {
+	case <-statusCorrectChan:
+	//	Test passed
+	case <-time.After(5 * time.Second):
+		kill <- struct{}{}
+		t.Fatalf("Client is not in disconnected state while it should be. Timed out")
+	}
+
+	// Check if the client can have its connection resumed using its state but also its configuration
+	if !IsStreamResumable(client) {
+		t.Fatalf("should support resumption")
+	}
+
+	// Reboot server. We need to make a new one because (at least for now) the mock server can only have one handler
+	// and they should be different between a first connection and a stream resume since exchanged messages
+	// are different (See XEP-0198)
+	mock2 := ServerMock{}
+	mock2.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		//	Reconnect
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		resumeStream(t, sc)
+		serverDone <- struct{}{}
+	})
+
+	// Reconnect
+	go func() {
+		err = client.Resume()
+		if err != nil {
+			t.Fatalf("could not connect client to mock server: %s", err)
+		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, clientDone)
+	waitForEntity(t, serverDone)
+
+	mock2.Stop()
+}
+
+func Test_StreamManagementFail(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		enableStreamManagement(t, sc, true, true)
+		serverDone <- struct{}{}
+	})
+
+	// Test / Check result
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testXMPPAddress,
+		},
+		Jid:                    "test@localhost",
+		Credential:             Password("test"),
+		Insecure:               true,
+		StreamManagementEnable: true,
+		streamManagementResume: true} // Enable stream management
+
+	var client *Client
+	router := NewRouter()
+	client, err := NewClient(&config, router, clientDefaultErrorHandler)
+	if err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	var state SMState
+	go func() {
+		_, err = client.transport.Connect()
+		if err != nil {
+			return
+		}
+
+		// Client is ok, we now open XMPP session
+		if client.Session, err = NewSession(client, state); err == nil {
+			t.Fatalf("test is supposed to err")
+		}
+		if client.Session.SMState.StreamErrorGroup == nil {
+			t.Fatalf("error was not stored correctly in session state")
+		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, serverDone)
+	waitForEntity(t, clientDone)
+
+	mock.Stop()
+}
+
+func Test_SendStanzaQueueWithSM(t *testing.T) {
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		enableStreamManagement(t, sc, false, true)
+
+		// Ignore the initial presence sent to the server by the client so we can move on to the next packet.
+		discardPresence(t, sc)
+
+		// Used here to silently discard the IQ sent by the client, in order to later trigger a resend
+		skipPacket(t, sc)
+		// Respond to the client ACK request with a number of processed stanzas of 0. This should trigger a resend
+		// of previously ignored stanza to the server, which this handler element will be expecting.
+		respondWithAck(t, sc, 0)
+		serverDone <- struct{}{}
+	})
+
+	// Test / Check result
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testXMPPAddress,
+		},
+		Jid:                    "test@localhost",
+		Credential:             Password("test"),
+		Insecure:               true,
+		StreamManagementEnable: true,
+		streamManagementResume: true} // Enable stream management
+
+	var client *Client
+	router := NewRouter()
+	client, err := NewClient(&config, router, clientDefaultErrorHandler)
+	if err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	go func() {
+		err = client.Connect()
+
+		client.SendRaw(`<iq id='ls72g593' type='get'>
+  <query xmlns='jabber:iq:roster'/>
+</iq>
+`)
+
+		// Last stanza was discarded silently by the server. Let's ask an ack for it. This should trigger resend as the server
+		// will respond with an acknowledged number of stanzas of 0.
+		r := stanza.SMRequest{}
+		client.Send(r)
+		clientDone <- struct{}{}
+	}()
+	waitForEntity(t, serverDone)
+	waitForEntity(t, clientDone)
+
+	mock.Stop()
+}
+
+//========================================================================
+// Helper functions for tests
+
+func skipPacket(t *testing.T, sc *ServerConn) {
+	var p stanza.IQ
+	se, err := stanza.NextStart(sc.decoder)
+
+	if err != nil {
+		t.Fatalf("cannot read packet: %s", err)
+		return
+	}
+	if err := sc.decoder.DecodeElement(&p, &se); err != nil {
+		t.Fatalf("cannot decode packet: %s", err)
+		return
+	}
+}
+
+func respondWithAck(t *testing.T, sc *ServerConn, h int) {
+
+	//  Mock server reads the ack request
+	var p stanza.SMRequest
+	se, err := stanza.NextStart(sc.decoder)
+
+	if err != nil {
+		t.Fatalf("cannot read packet: %s", err)
+		return
+	}
+	if err := sc.decoder.DecodeElement(&p, &se); err != nil {
+		t.Fatalf("cannot decode packet: %s", err)
+		return
+	}
+
+	// Mock server sends the ack response
+	a := stanza.SMAnswer{
+		H: uint(h),
+	}
+	data, err := xml.Marshal(a)
+	_, err = sc.connection.Write(data)
+	if err != nil {
+		t.Fatalf("failed to send response ack")
+	}
+
+	// Mock server reads the re-sent stanza that was previously discarded intentionally
+	var p2 stanza.IQ
+	nse, err := stanza.NextStart(sc.decoder)
+
+	if err != nil {
+		t.Fatalf("cannot read packet: %s", err)
+		return
+	}
+	if err := sc.decoder.DecodeElement(&p2, &nse); err != nil {
+		t.Fatalf("cannot decode packet: %s", err)
+		return
+	}
+}
+
+func sendFeaturesStreamManagment(t *testing.T, sc *ServerConn) {
+	// This is a basic server, supporting only 2 features after auth: stream management & session binding
+	features := `<stream:features>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
+  <sm xmlns='urn:xmpp:sm:3'/>
+</stream:features>`
+	if _, err := fmt.Fprintln(sc.connection, features); err != nil {
+		t.Fatalf("cannot send stream feature: %s", err)
+	}
+}
+
+func sendFeaturesNoStreamManagment(t *testing.T, sc *ServerConn) {
+	// This is a basic server, supporting only 2 features after auth: stream management & session binding
+	features := `<stream:features>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
+</stream:features>`
+	if _, err := fmt.Fprintln(sc.connection, features); err != nil {
+		t.Fatalf("cannot send stream feature: %s", err)
+	}
+}
+
+// enableStreamManagement is a function for the mock server that can either mock a successful session, or fail depending on
+// the value of the "fail" boolean. True means the session should fail.
+func enableStreamManagement(t *testing.T, sc *ServerConn, fail bool, resume bool) {
+	// Decode element into pointer storage
+	var ed stanza.SMEnable
+	se, err := stanza.NextStart(sc.decoder)
+
+	if err != nil {
+		t.Fatalf("cannot read stream management enable: %s", err)
+		return
+	}
+	if err := sc.decoder.DecodeElement(&ed, &se); err != nil {
+		t.Fatalf("cannot decode stream management enable: %s", err)
+		return
+	}
+
+	if fail {
+		f := stanza.SMFailed{
+			H:                nil,
+			StreamErrorGroup: &stanza.UnexpectedRequest{},
+		}
+		data, err := xml.Marshal(f)
+		if err != nil {
+			t.Fatalf("failed to marshall error response: %s", err)
+		}
+		sc.connection.Write(data)
+	} else {
+		e := &stanza.SMEnabled{
+			Resume: strconv.FormatBool(resume),
+			Id:     streamManagementID,
+		}
+		data, err := xml.Marshal(e)
+		if err != nil {
+			t.Fatalf("failed to marshall error response: %s", err)
+		}
+		sc.connection.Write(data)
+	}
+}
+
+func resumeStream(t *testing.T, sc *ServerConn) {
+	h := uint(0)
+	response := stanza.SMResumed{
+		PrevId: streamManagementID,
+		H:      &h,
+	}
+
+	data, err := xml.Marshal(response)
+	if err != nil {
+		t.Fatalf("failed to marshall stream management enabled response : %s", err)
+	}
+
+	writtenChan := make(chan struct{})
+
+	go func() {
+		sc.connection.Write(data)
+		writtenChan <- struct{}{}
+	}()
+	select {
+	case <-writtenChan:
+		// We're done here
+		return
+	case <-time.After(defaultTimeout):
+		t.Fatalf("failed to write enabled nonza to client")
+	}
+}
+
+func checkClientResumeStatus(client *Client, statusCorrectChan chan struct{}, killChan chan struct{}) {
+	for {
+		if client.CurrentState.getState() == StateDisconnected {
+			statusCorrectChan <- struct{}{}
+		}
+		select {
+		case <-killChan:
+			return
+		case <-time.After(time.Millisecond * 10):
+			//	Keep checking status value
+		}
+	}
+}
+
+func initSrvCliForResumeTests(t *testing.T, serverHandler func(*testing.T, *ServerConn), port int, StreamManagementEnable, StreamManagementResume bool) (*Client, *ServerMock) {
+	mock := &ServerMock{}
+	testServerAddress := fmt.Sprintf("%s:%d", testClientDomain, port)
+
+	mock.Start(t, testServerAddress, serverHandler)
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testServerAddress,
+		},
+		Jid:                    "test@localhost",
+		Credential:             Password("test"),
+		Insecure:               true,
+		StreamManagementEnable: StreamManagementEnable,
+		streamManagementResume: StreamManagementResume}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
+		t.Fatalf("connect create XMPP client: %s", err)
+	}
+
+	if _, err = client.transport.Connect(); err != nil {
+		t.Fatalf("XMPP connection failed: %s", err)
+	}
+
+	return client, mock
+}
+
+func waitForEntity(t *testing.T, entityDone chan struct{}) {
+	select {
+	case <-entityDone:
+	case <-time.After(defaultTimeout):
+		t.Fatalf("test timed out")
+	}
+}

client_test.go

@@ -20,18 +20,20 @@ const (
 
 func TestEventManager(t *testing.T) {
 	mgr := EventManager{}
-	mgr.updateState(StateConnected)
+	mgr.updateState(StateResuming)
-	if mgr.CurrentState != StateConnected {
+	if mgr.CurrentState.getState() != StateResuming {
 		t.Fatal("CurrentState not updated by updateState()")
 	}
 
 	mgr.disconnected(SMState{})
-	if mgr.CurrentState != StateDisconnected {
+
+	if mgr.CurrentState.getState() != StateDisconnected {
 		t.Fatalf("CurrentState not reset by disconnected()")
 	}
 
 	mgr.streamError(ErrTLSNotSupported.Error(), "")
-	if mgr.CurrentState != StateStreamError {
+
+	if mgr.CurrentState.getState() != StateStreamError {
 		t.Fatalf("CurrentState not set by streamError()")
 	}
 }
@@ -53,7 +55,7 @@ func TestClient_Connect(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("connect create XMPP client: %s", err)
 	}
 
@@ -84,7 +86,7 @@ func TestClient_NoInsecure(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("cannot create XMPP client: %s", err)
 	}
 
@@ -117,7 +119,7 @@ func TestClient_FeaturesTracking(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("cannot create XMPP client: %s", err)
 	}
 
@@ -147,7 +149,7 @@ func TestClient_RFC3921Session(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("connect create XMPP client: %s", err)
 	}
 
@@ -366,7 +368,7 @@ func TestClient_DisconnectStreamManager(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("cannot create XMPP client: %s", err)
 	}
 
@@ -386,6 +388,162 @@ func TestClient_DisconnectStreamManager(t *testing.T) {
 	mock.Stop()
 }
 
+func Test_ClientPostConnectHook(t *testing.T) {
+	done := make(chan struct{})
+	// Handler for Mock server
+	h := func(t *testing.T, sc *ServerConn) {
+		handlerClientConnectSuccess(t, sc)
+		done <- struct{}{}
+	}
+
+	hookChan := make(chan struct{})
+	mock := &ServerMock{}
+	testServerAddress := fmt.Sprintf("%s:%d", testClientDomain, testClientPostConnectHook)
+
+	mock.Start(t, testServerAddress, h)
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testServerAddress,
+		},
+		Jid:        "test@localhost",
+		Credential: Password("test"),
+		Insecure:   true}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	// The post connection client hook should just write to a channel that we will read later.
+	client.PostConnectHook = func() error {
+		go func() {
+			hookChan <- struct{}{}
+		}()
+		return nil
+	}
+	// Handle a possible error
+	errChan := make(chan error)
+	errorHandler := func(err error) {
+		errChan <- err
+	}
+	client.ErrorHandler = errorHandler
+	if err = client.Connect(); err != nil {
+		t.Errorf("XMPP connection failed: %s", err)
+	}
+
+	// Check if the post connection client hook was correctly called
+	select {
+	case err := <-errChan: // If the server sends an error, or there is a connection error
+		t.Fatal(err.Error())
+	case <-time.After(defaultChannelTimeout): // If we timeout
+		t.Fatal("Failed to call post connection client hook")
+	case <-hookChan:
+		// Test succeeded, channel was written to.
+	}
+
+	select {
+	case <-done:
+		mock.Stop()
+	case <-time.After(defaultChannelTimeout):
+		t.Fatal("The mock server failed to finish its job !")
+	}
+}
+
+func Test_ClientPostReconnectHook(t *testing.T) {
+	hookChan := make(chan struct{})
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		bind(t, sc)
+		enableStreamManagement(t, sc, false, true)
+	})
+
+	// Test / Check result
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testXMPPAddress,
+		},
+		Jid:                    "test@localhost",
+		Credential:             Password("test"),
+		Insecure:               true,
+		StreamManagementEnable: true,
+		streamManagementResume: true} // Enable stream management
+
+	var client *Client
+	router := NewRouter()
+	client, err := NewClient(&config, router, clientDefaultErrorHandler)
+	if err != nil {
+		t.Errorf("connect create XMPP client: %s", err)
+	}
+
+	client.PostResumeHook = func() error {
+		go func() {
+			hookChan <- struct{}{}
+		}()
+		return nil
+	}
+
+	err = client.Connect()
+	if err != nil {
+		t.Fatalf("could not connect client to mock server: %s", err)
+	}
+
+	transp, ok := client.transport.(*XMPPTransport)
+	if !ok {
+		t.Fatalf("problem with client transport ")
+	}
+
+	transp.conn.Close()
+	mock.Stop()
+
+	// Check if the client can have its connection resumed using its state but also its configuration
+	if !IsStreamResumable(client) {
+		t.Fatalf("should support resumption")
+	}
+
+	// Reboot server. We need to make a new one because (at least for now) the mock server can only have one handler
+	// and they should be different between a first connection and a stream resume since exchanged messages
+	// are different (See XEP-0198)
+	mock2 := ServerMock{}
+	mock2.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		//	Reconnect
+		checkClientOpenStream(t, sc)
+
+		sendStreamFeatures(t, sc) // Send initial features
+		readAuth(t, sc.decoder)
+		sc.connection.Write([]byte("<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>"))
+
+		checkClientOpenStream(t, sc)       // Reset stream
+		sendFeaturesStreamManagment(t, sc) // Send post auth features
+		resumeStream(t, sc)
+	})
+
+	// Reconnect
+	err = client.Resume()
+	if err != nil {
+		t.Fatalf("could not connect client to mock server: %s", err)
+	}
+
+	select {
+	case <-time.After(defaultChannelTimeout): // If we timeout
+		t.Fatal("Failed to call post connection client hook")
+	case <-hookChan:
+		// Test succeeded, channel was written to.
+	}
+
+	mock2.Stop()
+}
+
 //=============================================================================
 // Basic XMPP Server Mock Handlers.
 
@@ -449,7 +607,7 @@ func checkClientOpenStream(t *testing.T, sc *ServerConn) {
 		var token xml.Token
 		token, err := sc.decoder.Token()
 		if err != nil {
-			t.Errorf("cannot read next token: %s", err)
+			t.Fatalf("cannot read next token: %s", err)
 		}
 
 		switch elem := token.(type) {
@@ -464,6 +622,7 @@ func checkClientOpenStream(t *testing.T, sc *ServerConn) {
 			}
 			return
 		}
+
 	}
 }
 
@@ -472,7 +631,6 @@ func mockClientConnection(t *testing.T, serverHandler func(*testing.T, *ServerCo
 	testServerAddress := fmt.Sprintf("%s:%d", testClientDomain, port)
 
 	mock.Start(t, testServerAddress, serverHandler)
-
 	config := Config{
 		TransportConfiguration: TransportConfiguration{
 			Address: testServerAddress,
@@ -484,7 +642,7 @@ func mockClientConnection(t *testing.T, serverHandler func(*testing.T, *ServerCo
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+	if client, err = NewClient(&config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("connect create XMPP client: %s", err)
 	}
 

cmd/fluuxmpp/send.go

@@ -32,7 +32,7 @@ func sendxmpp(cmd *cobra.Command, args []string) {
 	msgText := args[1]
 
 	var err error
-	client, err := xmpp.NewClient(xmpp.Config{
+	client, err := xmpp.NewClient(&xmpp.Config{
 		TransportConfiguration: xmpp.TransportConfiguration{
 			Address: viper.GetString("addr"),
 		},

cmd/go.sum

@@ -65,6 +65,7 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/pprof v0.0.0-20190515194954-54271f7e092f/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
 github.com/google/pprof v0.0.0-20190908185732-236ed259b199/go.mod h1:zfwlbNMJ+OItoe0UupaVj+oy1omPYYDuagoSzA8v9mc=
+github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
 github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gopherjs/gopherjs v0.0.0-20181017120253-0766667cb4d1/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
@@ -92,6 +93,7 @@ github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/magiconair/properties v1.8.0 h1:LLgXmsheXeRoUOBOjtwPQCWIYqM/LU1ayDtDePerRcY=
 github.com/magiconair/properties v1.8.0/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
+github.com/magiconair/properties v1.8.1 h1:ZC2Vc7/ZFkGmsVC9KvOjumD+G5lXy2RtTKyzRKO2BQ4=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
 github.com/mailru/easyjson v0.0.0-20190403194419-1ea4449da983/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
 github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN94OJF2b5HbByQZoLdCWB1Yqtg26g4irojpc=
@@ -148,10 +150,12 @@ github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb6
 github.com/spf13/pflag v1.0.1/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.3.2/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
 github.com/spf13/viper v1.4.0 h1:yXHLWeravcrgGyFSyCgdYpXQ9dR9c/WED3pg1RhxqEU=
 github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/yZzE=
+github.com/spf13/viper v1.6.1 h1:VPZzIkznI1YhVMRi6vNFLHSwhnhReBfgTxIPccpfdZk=
 github.com/spf13/viper v1.6.1/go.mod h1:t3iDnF5Jlj76alVNuyFBk5oUMCvsrkbvZK0WQdfDi5k=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -159,6 +163,7 @@ github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
 github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5/go.mod h1:ncp9v5uamzpCO7NfCPTXjqaC+bZgJeR0sMTm6dMHP7U=
 github.com/twitchyliquid64/golang-asm v0.0.0-20190126203739-365674df15fc/go.mod h1:NoCfSFWosfqMqmmD7hApkirIK9ozpHjxRnRxs1l413A=
@@ -207,6 +212,7 @@ golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190618155005-516e3c20635f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190712062909-fae7ac547cb7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190813064441-fde4db37ae7a/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190927073244-c990c680b611 h1:q9u40nxWT5zRClI/uU9dHCiYGottAg6Nzz4YUQyHxdA=
 golang.org/x/sys v0.0.0-20190927073244-c990c680b611/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -231,6 +237,7 @@ gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
+gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
@@ -238,9 +245,11 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4 h1:/eiJrUcujPVeJ3xlSWaiNi3uSVmDGBK1pDHUHAnao1I=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gotest.tools v2.1.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 gotest.tools/gotestsum v0.3.5/go.mod h1:Mnf3e5FUzXbkCfynWBGOwLssY7gTQgCHObK9tMpAriY=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 mvdan.cc/sh v2.6.4+incompatible/go.mod h1:IeeQbZq+x2SUGBensq/jge5lLQbS3XT2ktyp3wrt4x8=
+nhooyr.io/websocket v1.6.5 h1:8TzpkldRfefda5JST+CnOH135bzVPz5uzfn/AF+gVKg=
 nhooyr.io/websocket v1.6.5/go.mod h1:F259lAzPRAH0htX2y3ehpJe09ih1aSHN7udWki1defY=

component.go

@@ -60,11 +60,10 @@ func NewComponent(opts ComponentOptions, r *Router, errorHandler func(error)) (*
 // Connect triggers component connection to XMPP server component port.
 // TODO: Failed handshake should be a permanent error
 func (c *Component) Connect() error {
-	var state SMState
+	return c.Resume()
-	return c.Resume(state)
 }
 
-func (c *Component) Resume(sm SMState) error {
+func (c *Component) Resume() error {
 	var err error
 	var streamId string
 	if c.ComponentOptions.TransportConfiguration.Domain == "" {
@@ -73,16 +72,13 @@ func (c *Component) Resume(sm SMState) error {
 	c.transport, err = NewComponentTransport(c.ComponentOptions.TransportConfiguration)
 	if err != nil {
 		c.updateState(StatePermanentError)
-
 		return NewConnError(err, true)
 	}
 
 	if streamId, err = c.transport.Connect(); err != nil {
 		c.updateState(StatePermanentError)
-
 		return NewConnError(err, true)
 	}
-	c.updateState(StateConnected)
 
 	// Authentication
 	if err := c.sendWithWriter(c.transport, []byte(fmt.Sprintf("<handshake>%s</handshake>", c.handshake(streamId)))); err != nil {

component_test.go

@@ -38,6 +38,8 @@ func TestHandshake(t *testing.T) {
 // Tests connection process with a handshake exchange
 // Tests multiple session IDs. All serverConnections should generate a unique stream ID
 func TestGenerateHandshakeId(t *testing.T) {
+	clientDone := make(chan struct{})
+	serverDone := make(chan struct{})
 	// Using this array with a channel to make a queue of values to test
 	// These are stream IDs that will be used to test the connection process, mixing them with the "secret" to generate
 	// some handshake value
@@ -57,11 +59,10 @@ func TestGenerateHandshakeId(t *testing.T) {
 	// Performs a Component connection with a handshake. It expects to have an ID sent its way through the "uchan"
 	// channel of this file. Otherwise it will hang for ever.
 	h := func(t *testing.T, sc *ServerConn) {
-
 		checkOpenStreamHandshakeID(t, sc, <-uchan)
 		readHandshakeComponent(t, sc.decoder)
 		sc.connection.Write([]byte("<handshake/>")) // That's all the server needs to return (see xep-0114)
-		return
+		serverDone <- struct{}{}
 	}
 
 	// Init mock server
@@ -92,14 +93,45 @@ func TestGenerateHandshakeId(t *testing.T) {
 	}
 
 	// Try connecting, and storing the resulting streamID in a map.
+	go func() {
 		m := make(map[string]bool)
 		for range uuidsArray {
-		streamId, _ := c.transport.Connect()
+			idChan := make(chan string)
-		m[c.handshake(streamId)] = true
+			go func() {
+				streamId, err := c.transport.Connect()
+				if err != nil {
+					t.Fatalf("failed to mock component connection to get a handshake: %s", err)
+				}
+				idChan <- streamId
+			}()
+
+			var streamId string
+			select {
+			case streamId = <-idChan:
+			case <-time.After(defaultTimeout):
+				t.Fatalf("test timed out")
+			}
+
+			hs := stanza.Handshake{
+				Value: c.handshake(streamId),
+			}
+			m[hs.Value] = true
+			hsRaw, err := xml.Marshal(hs)
+			if err != nil {
+				t.Fatalf("could not marshal handshake: %s", err)
+			}
+			c.SendRaw(string(hsRaw))
+			waitForEntity(t, serverDone)
+			c.transport.Close()
 		}
 		if len(uuidsArray) != len(m) {
 			t.Errorf("Handshake does not produce a unique id. Expected: %d unique ids, got: %d", len(uuidsArray), len(m))
 		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, clientDone)
+	mock.Stop()
 }
 
 // Test that NewStreamManager can accept a Component.
@@ -121,10 +153,11 @@ func TestDecoder(t *testing.T) {
 
 // Tests sending an IQ to the server, and getting the response
 func TestSendIq(t *testing.T) {
-	done := make(chan struct{})
+	serverDone := make(chan struct{})
+	clientDone := make(chan struct{})
 	h := func(t *testing.T, sc *ServerConn) {
 		handlerForComponentIQSend(t, sc)
-		done <- struct{}{}
+		serverDone <- struct{}{}
 	}
 
 	//Connecting to a mock server, initialized with given port and handler function
@@ -145,24 +178,23 @@ func TestSendIq(t *testing.T) {
 	}
 	c.ErrorHandler = errorHandler
 
+	go func() {
 		var res chan stanza.IQ
 		res, _ = c.SendIQ(ctx, iqReq)
 
 		select {
 		case <-res:
 		case err := <-errChan:
-		t.Errorf(err.Error())
+			t.Fatalf(err.Error())
-	case <-time.After(defaultChannelTimeout):
-		t.Errorf("Failed to receive response, to sent IQ, from mock server")
 		}
+		clientDone <- struct{}{}
+	}()
+
+	waitForEntity(t, clientDone)
+	waitForEntity(t, serverDone)
 
-	select {
-	case <-done:
-		m.Stop()
-	case <-time.After(defaultChannelTimeout):
-		t.Errorf("The mock server failed to finish its job !")
-	}
 	cancel()
+	m.Stop()
 }
 
 // Checking that error handling is done properly client side when an invalid IQ is sent and the server responds in kind.

config.go

@@ -21,4 +21,15 @@ type Config struct {
 	// Insecure can be set to true to allow to open a session without TLS. If TLS
 	// is supported on the server, we will still try to use it.
 	Insecure bool
+
+	// Activate stream management process during session
+	StreamManagementEnable bool
+	// Enable stream management resume capability
+	streamManagementResume bool
+}
+
+// IsStreamResumable tells if a stream session is resumable by reading the "config" part of a client.
+// It checks if stream management is enabled, and if stream resumption was set and accepted by the server.
+func IsStreamResumable(c *Client) bool {
+	return c.config.StreamManagementEnable && c.config.streamManagementResume
 }

router.go

@@ -42,6 +42,17 @@ func NewRouter() *Router {
 // route is called by the XMPP client to dispatch stanza received using the set up routes.
 // It is also used by test, but is not supposed to be used directly by users of the library.
 func (r *Router) route(s Sender, p stanza.Packet) {
+	a, isA := p.(stanza.SMAnswer)
+	if isA {
+		switch tt := s.(type) {
+		case *Client:
+			lastAcked := a.H
+			SendMissingStz(int(lastAcked), s, tt.Session.SMState.UnAckQueue)
+		case *Component:
+		// TODO
+		default:
+		}
+	}
 	iq, isIq := p.(*stanza.IQ)
 	if isIq {
 		r.IQResultRouteLock.RLock()
@@ -70,6 +81,33 @@ func (r *Router) route(s Sender, p stanza.Packet) {
 	}
 }
 
+// SendMissingStz sends all stanzas that did not reach the server, according to the response to an ack request (see XEP-0198, acks)
+func SendMissingStz(lastSent int, s Sender, uaq *stanza.UnAckQueue) error {
+	uaq.RWMutex.Lock()
+	if len(uaq.Uslice) <= 0 {
+		uaq.RWMutex.Unlock()
+		return nil
+	}
+	last := uaq.Uslice[len(uaq.Uslice)-1]
+	if last.Id > lastSent {
+		// Remove sent stanzas from the queue
+		uaq.PopN(lastSent - last.Id)
+		// Re-send non acknowledged stanzas
+		for _, elt := range uaq.PopN(len(uaq.Uslice)) {
+			eltStz := elt.(*stanza.UnAckedStz)
+			err := s.SendRaw(eltStz.Stz)
+			if err != nil {
+				return err
+			}
+
+		}
+		// Ask for updates on stanzas we just sent to the entity. Not sure I should leave this. Maybe let users call ack again by themselves ?
+		s.Send(stanza.SMRequest{})
+	}
+	uaq.RWMutex.Unlock()
+	return nil
+}
+
 func iqNotImplemented(s Sender, iq *stanza.IQ) {
 	err := stanza.Err{
 		XMLName: xml.Name{Local: "error"},

session.go

@@ -1,10 +1,11 @@
 package xmpp
 
 import (
+	"encoding/xml"
 	"errors"
 	"fmt"
-
 	"gosrc.io/xmpp/stanza"
+	"strconv"
 )
 
 type Session struct {
@@ -23,44 +24,67 @@ type Session struct {
 	err error
 }
 
-func NewSession(transport Transport, o Config, state SMState) (*Session, error) {
+func NewSession(c *Client, state SMState) (*Session, error) {
-	s := new(Session)
+	var s *Session
-	s.transport = transport
+	if c.Session == nil {
+		s = new(Session)
+		s.transport = c.transport
 		s.SMState = state
-	s.init(o)
+		s.init()
+	} else {
+		s = c.Session
+		// We keep information about the previously set session, like the session ID, but we read server provided
+		// info again in case it changed between session break and resume, such as features.
+		s.init()
+	}
 
 	if s.err != nil {
 		return nil, NewConnError(s.err, true)
 	}
 
-	if !transport.IsSecure() {
+	if !c.transport.IsSecure() {
-		s.startTlsIfSupported(o)
+		s.startTlsIfSupported(c.config)
 	}
 
-	if !transport.IsSecure() && !o.Insecure {
+	if !c.transport.IsSecure() && !c.config.Insecure {
 		err := fmt.Errorf("failed to negotiate TLS session : %s", s.err)
 		return nil, NewConnError(err, true)
 	}
 
 	if s.TlsEnabled {
-		s.reset(o)
+		s.reset()
 	}
 
 	// auth
-	s.auth(o)
+	s.auth(c.config)
-	s.reset(o)
+	if s.err != nil {
+		return s, s.err
+	}
+	s.reset()
+	if s.err != nil {
+		return s, s.err
+	}
 
 	// attempt resumption
-	if s.resume(o) {
+	if s.resume(c.config) {
 		return s, s.err
 	}
 
 	// otherwise, bind resource and 'start' XMPP session
-	s.bind(o)
+	s.bind(c.config)
-	s.rfc3921Session(o)
+	if s.err != nil {
+		return s, s.err
+	}
+	s.rfc3921Session()
+	if s.err != nil {
+		return s, s.err
+	}
 
 	// Enable stream management if supported
-	s.EnableStreamManagement(o)
+	s.EnableStreamManagement(c.config)
+	if s.err != nil {
+		return s, s.err
+	}
 
 	return s, s.err
 }
@@ -70,19 +94,20 @@ func (s *Session) PacketId() string {
 	return fmt.Sprintf("%x", s.lastPacketId)
 }
 
-func (s *Session) init(o Config) {
+// init gathers information on the session such as stream features from the server.
-	s.Features = s.open(o.parsedJid.Domain)
+func (s *Session) init() {
+	s.Features = s.extractStreamFeatures()
 }
 
-func (s *Session) reset(o Config) {
+func (s *Session) reset() {
 	if s.StreamId, s.err = s.transport.StartStream(); s.err != nil {
 		return
 	}
 
-	s.Features = s.open(o.parsedJid.Domain)
+	s.Features = s.extractStreamFeatures()
 }
 
-func (s *Session) open(domain string) (f stanza.StreamFeatures) {
+func (s *Session) extractStreamFeatures() (f stanza.StreamFeatures) {
 	// extract stream features
 	if s.err = s.transport.GetDecoder().Decode(&f); s.err != nil {
 		s.err = errors.New("stream open decode features: " + s.err.Error())
@@ -90,7 +115,7 @@ func (s *Session) open(domain string) (f stanza.StreamFeatures) {
 	return
 }
 
-func (s *Session) startTlsIfSupported(o Config) {
+func (s *Session) startTlsIfSupported(o *Config) {
 	if s.err != nil {
 		return
 	}
@@ -125,7 +150,7 @@ func (s *Session) startTlsIfSupported(o Config) {
 	}
 }
 
-func (s *Session) auth(o Config) {
+func (s *Session) auth(o *Config) {
 	if s.err != nil {
 		return
 	}
@@ -134,7 +159,7 @@ func (s *Session) auth(o Config) {
 }
 
 // Attempt to resume session using stream management
-func (s *Session) resume(o Config) bool {
+func (s *Session) resume(o *Config) bool {
 	if !s.Features.DoesStreamManagement() {
 		return false
 	}
@@ -142,9 +167,16 @@ func (s *Session) resume(o Config) bool {
 		return false
 	}
 
-	fmt.Fprintf(s.transport, "<resume xmlns='%s' h='%d' previd='%s'/>",
+	rsm := stanza.SMResume{
-		stanza.NSStreamManagement, s.SMState.Inbound, s.SMState.Id)
+		PrevId: s.SMState.Id,
+		H:      &s.SMState.Inbound,
+	}
+	data, err := xml.Marshal(rsm)
 
+	_, err = s.transport.Write(data)
+	if err != nil {
+		return false
+	}
 	var packet stanza.Packet
 	packet, s.err = stanza.NextPacket(s.transport.GetDecoder())
 	if s.err == nil {
@@ -165,20 +197,48 @@ func (s *Session) resume(o Config) bool {
 	return false
 }
 
-func (s *Session) bind(o Config) {
+func (s *Session) bind(o *Config) {
 	if s.err != nil {
 		return
 	}
 
 	// Send IQ message asking to bind to the local user name.
 	var resource = o.parsedJid.Resource
-	if resource != "" {
+	iqB, err := stanza.NewIQ(stanza.Attrs{
-		fmt.Fprintf(s.transport, "<iq type='set' id='%s'><bind xmlns='%s'><resource>%s</resource></bind></iq>",
+		Type: stanza.IQTypeSet,
-			s.PacketId(), stanza.NSBind, resource)
+		Id:   s.PacketId(),
-	} else {
+	})
-		fmt.Fprintf(s.transport, "<iq type='set' id='%s'><bind xmlns='%s'/></iq>", s.PacketId(), stanza.NSBind)
+	if err != nil {
+		s.err = err
+		return
 	}
 
+	// Check if we already have a resource name, and include it in the request if so
+	if resource != "" {
+		iqB.Payload = &stanza.Bind{
+			Resource: resource,
+		}
+	} else {
+		iqB.Payload = &stanza.Bind{}
+
+	}
+
+	// Send the bind request IQ
+	data, err := xml.Marshal(iqB)
+	if err != nil {
+		s.err = err
+		return
+	}
+	n, err := s.transport.Write(data)
+	if err != nil {
+		s.err = err
+		return
+	} else if n == 0 {
+		s.err = errors.New("failed to write bind iq stanza to the server : wrote 0 bytes")
+		return
+	}
+
+	// Check the server response
 	var iq stanza.IQ
 	if s.err = s.transport.GetDecoder().Decode(&iq); s.err != nil {
 		s.err = errors.New("error decoding iq bind result: " + s.err.Error())
@@ -197,7 +257,7 @@ func (s *Session) bind(o Config) {
 }
 
 // After the bind, if the session is not optional (as per old RFC 3921), we send the session open iq.
-func (s *Session) rfc3921Session(o Config) {
+func (s *Session) rfc3921Session() {
 	if s.err != nil {
 		return
 	}
@@ -205,7 +265,29 @@ func (s *Session) rfc3921Session(o Config) {
 	var iq stanza.IQ
 	// We only negotiate session binding if it is mandatory, we skip it when optional.
 	if !s.Features.Session.IsOptional() {
-		fmt.Fprintf(s.transport, "<iq type='set' id='%s'><session xmlns='%s'/></iq>", s.PacketId(), stanza.NSSession)
+		se, err := stanza.NewIQ(stanza.Attrs{
+			Type: stanza.IQTypeSet,
+			Id:   s.PacketId(),
+		})
+		if err != nil {
+			s.err = err
+			return
+		}
+		se.Payload = &stanza.StreamSession{}
+		data, err := xml.Marshal(se)
+		if err != nil {
+			s.err = err
+			return
+		}
+		n, err := s.transport.Write(data)
+		if err != nil {
+			s.err = err
+			return
+		} else if n == 0 {
+			s.err = errors.New("there was a problem marshaling the session IQ : wrote 0 bytes to server")
+			return
+		}
+
 		if s.err = s.transport.GetDecoder().Decode(&iq); s.err != nil {
 			s.err = errors.New("expecting iq result after session open: " + s.err.Error())
 			return
@@ -214,28 +296,47 @@ func (s *Session) rfc3921Session(o Config) {
 }
 
 // Enable stream management, with session resumption, if supported.
-func (s *Session) EnableStreamManagement(o Config) {
+func (s *Session) EnableStreamManagement(o *Config) {
 	if s.err != nil {
 		return
 	}
-	if !s.Features.DoesStreamManagement() {
+	if !s.Features.DoesStreamManagement() || !o.StreamManagementEnable {
+		return
+	}
+	q := stanza.NewUnAckQueue()
+	ebleNonza := stanza.SMEnable{Resume: &o.streamManagementResume}
+	pktStr, err := xml.Marshal(ebleNonza)
+	if err != nil {
+		s.err = err
+		return
+	}
+	_, err = s.transport.Write(pktStr)
+	if err != nil {
+		s.err = err
 		return
 	}
-
-	fmt.Fprintf(s.transport, "<enable xmlns='%s' resume='true'/>", stanza.NSStreamManagement)
 
 	var packet stanza.Packet
 	packet, s.err = stanza.NextPacket(s.transport.GetDecoder())
 	if s.err == nil {
 		switch p := packet.(type) {
 		case stanza.SMEnabled:
-			s.SMState = SMState{Id: p.Id}
+			// Server allows resumption or not using SMEnabled attribute "resume". We must read the server response
+			// and update config accordingly
+			b, err := strconv.ParseBool(p.Resume)
+			if err != nil || !b {
+				o.StreamManagementEnable = false
+			}
+			s.SMState = SMState{Id: p.Id, preferredReconAddr: p.Location}
+			s.SMState.UnAckQueue = q
 		case stanza.SMFailed:
 			// TODO: Store error in SMState, for later inspection
+			s.SMState = SMState{StreamErrorGroup: p.StreamErrorGroup}
+			s.SMState.UnAckQueue = q
+			s.err = errors.New("failed to establish session : " + s.SMState.StreamErrorGroup.GroupErrorName())
 		default:
 			s.err = errors.New("unexpected reply to SM enable")
 		}
 	}
-
 	return
 }

stanza/fifo_queue.go

@@ -0,0 +1,34 @@
+package stanza
+
+// FIFO queue for string contents
+// Implementations have no guarantee regarding thread safety !
+type FifoQueue interface {
+	// Pop returns the first inserted element still in queue and deletes it from queue. If queue is empty, returns nil
+	// No guarantee regarding thread safety !
+	Pop() Queueable
+
+	// PopN returns the N first inserted elements still in queue and deletes them from queue. If queue is empty or i<=0, returns nil
+	// If number to pop is greater than queue length, returns all queue elements
+	// No guarantee regarding thread safety !
+	PopN(i int) []Queueable
+
+	// Peek returns a copy of the first inserted element in queue without deleting it. If queue is empty, returns nil
+	// No guarantee regarding thread safety !
+	Peek() Queueable
+
+	// Peek returns a copy of the first inserted element in queue without deleting it. If queue is empty or i<=0, returns nil.
+	// If number to peek is greater than queue length, returns all queue elements
+	// No guarantee regarding thread safety !
+	PeekN() []Queueable
+	// Push adds an element to the queue
+	// No guarantee regarding thread safety !
+	Push(s Queueable) error
+
+	// Empty returns true if queue is empty
+	// No guarantee regarding thread safety !
+	Empty() bool
+}
+
+type Queueable interface {
+	QueueableName() string
+}

stanza/sasl_auth.go

@@ -94,7 +94,7 @@ func (b *Bind) GetSet() *ResultSet {
 //    https://tools.ietf.org/html/draft-cridland-xmpp-session-01
 type StreamSession struct {
 	XMLName  xml.Name  `xml:"urn:ietf:params:xml:ns:xmpp-session session"`
-	Optional bool     // If element does exist, it mean we are not required to open session
+	Optional *struct{} // If element does exist, it mean we are not required to open session
 	// Result sets
 	ResultSet *ResultSet `xml:"set,omitempty"`
 }
@@ -109,7 +109,7 @@ func (s *StreamSession) GetSet() *ResultSet {
 
 func (s *StreamSession) IsOptional() bool {
 	if s.XMLName.Local == "session" {
-		return s.Optional
+		return s.Optional != nil
 	}
 	// If session element is missing, then we should not use session
 	return true

stanza/sasl_auth_test.go

@@ -9,7 +9,7 @@ import (
 
 // Check that we can detect optional session from advertised stream features
 func TestSessionFeatures(t *testing.T) {
-	streamFeatures := stanza.StreamFeatures{Session: stanza.StreamSession{Optional: true}}
+	streamFeatures := stanza.StreamFeatures{Session: stanza.StreamSession{Optional: &struct{}{}}}
 
 	data, err := xml.Marshal(streamFeatures)
 	if err != nil {
@@ -32,7 +32,7 @@ func TestSessionIQ(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to create IQ: %v", err)
 	}
-	iq.Payload = &stanza.StreamSession{XMLName: xml.Name{Local: "session"}, Optional: true}
+	iq.Payload = &stanza.StreamSession{XMLName: xml.Name{Local: "session"}, Optional: &struct{}{}}
 
 	data, err := xml.Marshal(iq)
 	if err != nil {

stanza/stanza_errors.go

@@ -0,0 +1,171 @@
+package stanza
+
+import (
+	"encoding/xml"
+)
+
+type StanzaErrorGroup interface {
+	GroupErrorName() string
+}
+
+type BadFormat struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas bad-format"`
+}
+
+func (e *BadFormat) GroupErrorName() string { return "bad-format" }
+
+type BadNamespacePrefix struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas bad-namespace-prefix"`
+}
+
+func (e *BadNamespacePrefix) GroupErrorName() string { return "bad-namespace-prefix" }
+
+type Conflict struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas conflict"`
+}
+
+func (e *Conflict) GroupErrorName() string { return "conflict" }
+
+type ConnectionTimeout struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas connection-timeout"`
+}
+
+func (e *ConnectionTimeout) GroupErrorName() string { return "connection-timeout" }
+
+type HostGone struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas host-gone"`
+}
+
+func (e *HostGone) GroupErrorName() string { return "host-gone" }
+
+type HostUnknown struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas host-unknown"`
+}
+
+func (e *HostUnknown) GroupErrorName() string { return "host-unknown" }
+
+type ImproperAddressing struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas improper-addressing"`
+}
+
+func (e *ImproperAddressing) GroupErrorName() string { return "improper-addressing" }
+
+type InternalServerError struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas internal-server-error"`
+}
+
+func (e *InternalServerError) GroupErrorName() string { return "internal-server-error" }
+
+type InvalidForm struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas invalid-from"`
+}
+
+func (e *InvalidForm) GroupErrorName() string { return "invalid-from" }
+
+type InvalidId struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas invalid-id"`
+}
+
+func (e *InvalidId) GroupErrorName() string { return "invalid-id" }
+
+type InvalidNamespace struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas invalid-namespace"`
+}
+
+func (e *InvalidNamespace) GroupErrorName() string { return "invalid-namespace" }
+
+type InvalidXML struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas invalid-xml"`
+}
+
+func (e *InvalidXML) GroupErrorName() string { return "invalid-xml" }
+
+type NotAuthorized struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas not-authorized"`
+}
+
+func (e *NotAuthorized) GroupErrorName() string { return "not-authorized" }
+
+type NotWellFormed struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas not-well-formed"`
+}
+
+func (e *NotWellFormed) GroupErrorName() string { return "not-well-formed" }
+
+type PolicyViolation struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas policy-violation"`
+}
+
+func (e *PolicyViolation) GroupErrorName() string { return "policy-violation" }
+
+type RemoteConnectionFailed struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas remote-connection-failed"`
+}
+
+func (e *RemoteConnectionFailed) GroupErrorName() string { return "remote-connection-failed" }
+
+type Reset struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas reset"`
+}
+
+func (e *Reset) GroupErrorName() string { return "reset" }
+
+type ResourceConstraint struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas resource-constraint"`
+}
+
+func (e *ResourceConstraint) GroupErrorName() string { return "resource-constraint" }
+
+type RestrictedXML struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas restricted-xml"`
+}
+
+func (e *RestrictedXML) GroupErrorName() string { return "restricted-xml" }
+
+type SeeOtherHost struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas see-other-host"`
+}
+
+func (e *SeeOtherHost) GroupErrorName() string { return "see-other-host" }
+
+type SystemShutdown struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas system-shutdown"`
+}
+
+func (e *SystemShutdown) GroupErrorName() string { return "system-shutdown" }
+
+type UndefinedCondition struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas undefined-condition"`
+}
+
+func (e *UndefinedCondition) GroupErrorName() string { return "undefined-condition" }
+
+type UnsupportedEncoding struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas unsupported-encoding"`
+}
+
+type UnexpectedRequest struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas unexpected-request"`
+}
+
+func (e *UnexpectedRequest) GroupErrorName() string { return "unexpected-request" }
+
+func (e *UnsupportedEncoding) GroupErrorName() string { return "unsupported-encoding" }
+
+type UnsupportedStanzaType struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas unsupported-stanza-type"`
+}
+
+func (e *UnsupportedStanzaType) GroupErrorName() string { return "unsupported-stanza-type" }
+
+type UnsupportedVersion struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas unsupported-version"`
+}
+
+func (e *UnsupportedVersion) GroupErrorName() string { return "unsupported-version" }
+
+type XMLNotWellFormed struct {
+	XMLName xml.Name `xml:"urn:ietf:params:xml:ns:xmpp-stanzas xml-not-well-formed"`
+}
+
+func (e *XMLNotWellFormed) GroupErrorName() string { return "xml-not-well-formed" }

stanza/stream_features.go

@@ -118,6 +118,10 @@ type streamManagement struct {
 	XMLName xml.Name `xml:"urn:xmpp:sm:3 sm"`
 }
 
+func (streamManagement) Name() string {
+	return "streamManagement"
+}
+
 func (sf *StreamFeatures) DoesStreamManagement() (isSupported bool) {
 	if sf.StreamManagement.XMLName.Space+" "+sf.StreamManagement.XMLName.Local == "urn:xmpp:sm:3 sm" {
 		return true

stanza/stream_management.go

@@ -3,12 +3,19 @@ package stanza
 import (
 	"encoding/xml"
 	"errors"
+	"sync"
 )
 
 const (
 	NSStreamManagement = "urn:xmpp:sm:3"
 )
 
+type SMEnable struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 enable"`
+	Max     *uint    `xml:"max,attr,omitempty"`
+	Resume  *bool    `xml:"resume,attr,omitempty"`
+}
+
 // Enabled as defined in Stream Management spec
 // Reference: https://xmpp.org/extensions/xep-0198.html#enable
 type SMEnabled struct {
@@ -23,6 +30,112 @@ func (SMEnabled) Name() string {
 	return "Stream Management: enabled"
 }
 
+type UnAckQueue struct {
+	Uslice []*UnAckedStz
+	sync.RWMutex
+}
+type UnAckedStz struct {
+	Id  int
+	Stz string
+}
+
+func NewUnAckQueue() *UnAckQueue {
+	return &UnAckQueue{
+		Uslice:  make([]*UnAckedStz, 0, 10), // Capacity is 0 to comply with "Push" implementation (so that no reachable element is nil)
+		RWMutex: sync.RWMutex{},
+	}
+}
+
+func (u *UnAckedStz) QueueableName() string {
+	return "Un-acknowledged stanza"
+}
+
+func (uaq *UnAckQueue) PeekN(n int) []Queueable {
+	if uaq == nil {
+		return nil
+	}
+	if n <= 0 {
+		return nil
+	}
+	if len(uaq.Uslice) < n {
+		n = len(uaq.Uslice)
+	}
+
+	if len(uaq.Uslice) == 0 {
+		return nil
+	}
+	var r []Queueable
+	for i := 0; i < n; i++ {
+		r = append(r, uaq.Uslice[i])
+	}
+	return r
+}
+
+// No guarantee regarding thread safety !
+func (uaq *UnAckQueue) Pop() Queueable {
+	if uaq == nil {
+		return nil
+	}
+	r := uaq.Peek()
+	if r != nil {
+		uaq.Uslice = uaq.Uslice[1:]
+	}
+	return r
+}
+
+// No guarantee regarding thread safety !
+func (uaq *UnAckQueue) PopN(n int) []Queueable {
+	if uaq == nil {
+		return nil
+	}
+	r := uaq.PeekN(n)
+	uaq.Uslice = uaq.Uslice[len(r):]
+	return r
+}
+
+func (uaq *UnAckQueue) Peek() Queueable {
+	if uaq == nil {
+		return nil
+	}
+	if len(uaq.Uslice) == 0 {
+		return nil
+	}
+	r := uaq.Uslice[0]
+	return r
+}
+
+func (uaq *UnAckQueue) Push(s Queueable) error {
+	if uaq == nil {
+		return nil
+	}
+	pushIdx := 1
+	if len(uaq.Uslice) != 0 {
+		pushIdx = uaq.Uslice[len(uaq.Uslice)-1].Id + 1
+	}
+
+	sStz, ok := s.(*UnAckedStz)
+	if !ok {
+		return errors.New("element in not compatible with this queue. expected an UnAckedStz")
+	}
+
+	e := UnAckedStz{
+		Id:  pushIdx,
+		Stz: sStz.Stz,
+	}
+
+	uaq.Uslice = append(uaq.Uslice, &e)
+
+	return nil
+}
+
+func (uaq *UnAckQueue) Empty() bool {
+	if uaq == nil {
+		return true
+	}
+	r := len(uaq.Uslice)
+	return r == 0
+}
+
 // Request as defined in Stream Management spec
 // Reference: https://xmpp.org/extensions/xep-0198.html#acking
 type SMRequest struct {
@@ -37,7 +150,7 @@ func (SMRequest) Name() string {
 // Reference: https://xmpp.org/extensions/xep-0198.html#acking
 type SMAnswer struct {
 	XMLName xml.Name `xml:"urn:xmpp:sm:3 a"`
-	H       uint     `xml:"h,attr,omitempty"`
+	H       uint     `xml:"h,attr"`
 }
 
 func (SMAnswer) Name() string {
@@ -49,24 +162,175 @@ func (SMAnswer) Name() string {
 type SMResumed struct {
 	XMLName xml.Name `xml:"urn:xmpp:sm:3 resumed"`
 	PrevId  string   `xml:"previd,attr,omitempty"`
-	H       uint     `xml:"h,attr,omitempty"`
+	H       *uint    `xml:"h,attr,omitempty"`
 }
 
 func (SMResumed) Name() string {
 	return "Stream Management: resumed"
 }
 
+// Resume as defined in Stream Management spec
+// Reference: https://xmpp.org/extensions/xep-0198.html#acking
+type SMResume struct {
+	XMLName xml.Name `xml:"urn:xmpp:sm:3 resume"`
+	PrevId  string   `xml:"previd,attr,omitempty"`
+	H       *uint    `xml:"h,attr,omitempty"`
+}
+
+func (SMResume) Name() string {
+	return "Stream Management: resume"
+}
+
 // Failed as defined in Stream Management spec
 // Reference: https://xmpp.org/extensions/xep-0198.html#acking
 type SMFailed struct {
 	XMLName xml.Name `xml:"urn:xmpp:sm:3 failed"`
-	// TODO: Handle decoding error cause (need custom parsing).
+	H       *uint    `xml:"h,attr,omitempty"`
+
+	StreamErrorGroup StanzaErrorGroup
 }
 
 func (SMFailed) Name() string {
 	return "Stream Management: failed"
 }
 
+func (smf *SMFailed) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	smf.XMLName = start.Name
+
+	// According to https://xmpp.org/rfcs/rfc3920.html#def we should have no attributes aside from the namespace
+	// which we don't use internally
+
+	// decode inner elements
+	for {
+		t, err := d.Token()
+		if err != nil {
+			return err
+		}
+
+		switch tt := t.(type) {
+
+		case xml.StartElement:
+			// Decode sub-elements
+			var err error
+			switch tt.Name.Local {
+			case "bad-format":
+				bf := BadFormat{}
+				err = d.DecodeElement(&bf, &tt)
+				smf.StreamErrorGroup = &bf
+			case "bad-namespace-prefix":
+				bnp := BadNamespacePrefix{}
+				err = d.DecodeElement(&bnp, &tt)
+				smf.StreamErrorGroup = &bnp
+			case "conflict":
+				c := Conflict{}
+				err = d.DecodeElement(&c, &tt)
+				smf.StreamErrorGroup = &c
+			case "connection-timeout":
+				ct := ConnectionTimeout{}
+				err = d.DecodeElement(&ct, &tt)
+				smf.StreamErrorGroup = &ct
+			case "host-gone":
+				hg := HostGone{}
+				err = d.DecodeElement(&hg, &tt)
+				smf.StreamErrorGroup = &hg
+			case "host-unknown":
+				hu := HostUnknown{}
+				err = d.DecodeElement(&hu, &tt)
+				smf.StreamErrorGroup = &hu
+			case "improper-addressing":
+				ia := ImproperAddressing{}
+				err = d.DecodeElement(&ia, &tt)
+				smf.StreamErrorGroup = &ia
+			case "internal-server-error":
+				ise := InternalServerError{}
+				err = d.DecodeElement(&ise, &tt)
+				smf.StreamErrorGroup = &ise
+			case "invalid-from":
+				ifrm := InvalidForm{}
+				err = d.DecodeElement(&ifrm, &tt)
+				smf.StreamErrorGroup = &ifrm
+			case "invalid-id":
+				id := InvalidId{}
+				err = d.DecodeElement(&id, &tt)
+				smf.StreamErrorGroup = &id
+			case "invalid-namespace":
+				ins := InvalidNamespace{}
+				err = d.DecodeElement(&ins, &tt)
+				smf.StreamErrorGroup = &ins
+			case "invalid-xml":
+				ix := InvalidXML{}
+				err = d.DecodeElement(&ix, &tt)
+				smf.StreamErrorGroup = &ix
+			case "not-authorized":
+				na := NotAuthorized{}
+				err = d.DecodeElement(&na, &tt)
+				smf.StreamErrorGroup = &na
+			case "not-well-formed":
+				nwf := NotWellFormed{}
+				err = d.DecodeElement(&nwf, &tt)
+				smf.StreamErrorGroup = &nwf
+			case "policy-violation":
+				pv := PolicyViolation{}
+				err = d.DecodeElement(&pv, &tt)
+				smf.StreamErrorGroup = &pv
+			case "remote-connection-failed":
+				rcf := RemoteConnectionFailed{}
+				err = d.DecodeElement(&rcf, &tt)
+				smf.StreamErrorGroup = &rcf
+			case "resource-constraint":
+				rc := ResourceConstraint{}
+				err = d.DecodeElement(&rc, &tt)
+				smf.StreamErrorGroup = &rc
+			case "restricted-xml":
+				rx := RestrictedXML{}
+				err = d.DecodeElement(&rx, &tt)
+				smf.StreamErrorGroup = &rx
+			case "see-other-host":
+				soh := SeeOtherHost{}
+				err = d.DecodeElement(&soh, &tt)
+				smf.StreamErrorGroup = &soh
+			case "system-shutdown":
+				ss := SystemShutdown{}
+				err = d.DecodeElement(&ss, &tt)
+				smf.StreamErrorGroup = &ss
+			case "undefined-condition":
+				uc := UndefinedCondition{}
+				err = d.DecodeElement(&uc, &tt)
+				smf.StreamErrorGroup = &uc
+			case "unexpected-request":
+				ur := UnexpectedRequest{}
+				err = d.DecodeElement(&ur, &tt)
+				smf.StreamErrorGroup = &ur
+			case "unsupported-encoding":
+				ue := UnsupportedEncoding{}
+				err = d.DecodeElement(&ue, &tt)
+				smf.StreamErrorGroup = &ue
+			case "unsupported-stanza-type":
+				ust := UnsupportedStanzaType{}
+				err = d.DecodeElement(&ust, &tt)
+				smf.StreamErrorGroup = &ust
+			case "unsupported-version":
+				uv := UnsupportedVersion{}
+				err = d.DecodeElement(&uv, &tt)
+				smf.StreamErrorGroup = &uv
+			case "xml-not-well-formed":
+				xnwf := XMLNotWellFormed{}
+				err = d.DecodeElement(&xnwf, &tt)
+				smf.StreamErrorGroup = &xnwf
+			default:
+				return errors.New("error is unknown")
+			}
+			if err != nil {
+				return err
+			}
+		case xml.EndElement:
+			if tt == start.End() {
+				return nil
+			}
+		}
+	}
+}
+
 type smDecoder struct{}
 
 var sm smDecoder
@@ -78,9 +342,11 @@ func (s smDecoder) decode(p *xml.Decoder, se xml.StartElement) (Packet, error) {
 		return s.decodeEnabled(p, se)
 	case "resumed":
 		return s.decodeResumed(p, se)
+	case "resume":
+		return s.decodeResume(p, se)
 	case "r":
 		return s.decodeRequest(p, se)
-	case "h":
+	case "a":
 		return s.decodeAnswer(p, se)
 	case "failed":
 		return s.decodeFailed(p, se)
@@ -102,6 +368,11 @@ func (smDecoder) decodeResumed(p *xml.Decoder, se xml.StartElement) (SMResumed,
 	return packet, err
 }
 
+func (smDecoder) decodeResume(p *xml.Decoder, se xml.StartElement) (SMResume, error) {
+	var packet SMResume
+	err := p.DecodeElement(&packet, &se)
+	return packet, err
+}
 func (smDecoder) decodeRequest(p *xml.Decoder, se xml.StartElement) (SMRequest, error) {
 	var packet SMRequest
 	err := p.DecodeElement(&packet, &se)

stanza/stream_management_test.go

@@ -0,0 +1,226 @@
+package stanza_test
+
+import (
+	"gosrc.io/xmpp/stanza"
+	"math/rand"
+	"reflect"
+	"testing"
+	"time"
+)
+
+func TestPopEmptyQueue(t *testing.T) {
+	var uaq stanza.UnAckQueue
+	popped := uaq.Pop()
+	if popped != nil {
+		t.Fatalf("queue is empty but something was popped !")
+	}
+}
+
+func TestPushUnack(t *testing.T) {
+	uaq := initUnAckQueue()
+	toPush := stanza.UnAckedStz{
+		Id: 3,
+		Stz: `<iq type='submit'
+    from='confucius@scholars.lit/home'
+    to='registrar.scholars.lit'
+    id='kj3b157n'
+    xml:lang='en'>
+  <query xmlns='jabber:iq:register'>
+    <username>confucius</username>
+    <first>Qui</first>
+    <last>Kong</last>
+  </query>
+</iq>`,
+	}
+
+	err := uaq.Push(&toPush)
+	if err != nil {
+		t.Fatalf("could not push element to the queue : %v", err)
+	}
+
+	if len(uaq.Uslice) != 4 {
+		t.Fatalf("push to the non-acked queue failed")
+	}
+	for i := 0; i < 4; i++ {
+		if uaq.Uslice[i].Id != i+1 {
+			t.Fatalf("indexes were not updated correctly. Expected %d got %d", i, uaq.Uslice[i].Id)
+		}
+	}
+
+	// Check that the queue is a fifo : popped element should not be the one we just pushed.
+	popped := uaq.Pop()
+	poppedElt, ok := popped.(*stanza.UnAckedStz)
+	if !ok {
+		t.Fatalf("popped element is not a *stanza.UnAckedStz")
+	}
+
+	if reflect.DeepEqual(*poppedElt, toPush) {
+		t.Fatalf("pushed element is at the top of the fifo queue when it should be at the bottom")
+	}
+
+}
+
+func TestPeekUnack(t *testing.T) {
+	uaq := initUnAckQueue()
+
+	expectedPeek := stanza.UnAckedStz{
+		Id: 1,
+		Stz: `<iq type='set'
+    from='romeo@montague.net/home'
+    to='characters.shakespeare.lit'
+    id='search2'
+    xml:lang='en'>
+  <query xmlns='jabber:iq:search'>
+    <last>Capulet</last>
+  </query>
+</iq>`,
+	}
+
+	if !reflect.DeepEqual(expectedPeek, *uaq.Uslice[0]) {
+		t.Fatalf("peek failed to return the correct stanza")
+	}
+
+}
+
+func TestPeekNUnack(t *testing.T) {
+	uaq := initUnAckQueue()
+	initLen := len(uaq.Uslice)
+	randPop := rand.Int31n(int32(initLen))
+
+	peeked := uaq.PeekN(int(randPop))
+
+	if len(uaq.Uslice) != initLen {
+		t.Fatalf("queue length changed whith peek n operation : had %d found %d after peek", initLen, len(uaq.Uslice))
+	}
+
+	if len(peeked) != int(randPop) {
+		t.Fatalf("did not peek the correct number of element from queue. Expected %d got %d", randPop, len(peeked))
+	}
+}
+
+func TestPeekNUnackTooLong(t *testing.T) {
+	uaq := initUnAckQueue()
+	initLen := len(uaq.Uslice)
+
+	// Have a random number of elements to peek that's greater than the queue size
+	randPop := rand.Int31n(int32(initLen)) + 1 + int32(initLen)
+
+	peeked := uaq.PeekN(int(randPop))
+
+	if len(uaq.Uslice) != initLen {
+		t.Fatalf("total length changed whith peek n operation : had %d found %d after pop", initLen, len(uaq.Uslice))
+	}
+
+	if len(peeked) != initLen {
+		t.Fatalf("did not peek the correct number of element from queue. Expected %d got %d", initLen, len(peeked))
+	}
+
+}
+
+func TestPopNUnack(t *testing.T) {
+	uaq := initUnAckQueue()
+	initLen := len(uaq.Uslice)
+	randPop := rand.Int31n(int32(initLen))
+
+	popped := uaq.PopN(int(randPop))
+
+	if len(uaq.Uslice)+len(popped) != initLen {
+		t.Fatalf("total length changed whith pop n operation : had %d found %d after pop", initLen, len(uaq.Uslice)+len(popped))
+	}
+
+	for _, elt := range popped {
+		for _, oldElt := range uaq.Uslice {
+			if reflect.DeepEqual(elt, oldElt) {
+				t.Fatalf("pop n operation duplicated some elements")
+			}
+		}
+	}
+}
+
+func TestPopNUnackTooLong(t *testing.T) {
+	uaq := initUnAckQueue()
+	initLen := len(uaq.Uslice)
+
+	// Have a random number of elements to pop that's greater than the queue size
+	randPop := rand.Int31n(int32(initLen)) + 1 + int32(initLen)
+
+	popped := uaq.PopN(int(randPop))
+
+	if len(uaq.Uslice)+len(popped) != initLen {
+		t.Fatalf("total length changed whith pop n operation : had %d found %d after pop", initLen, len(uaq.Uslice)+len(popped))
+	}
+
+	for _, elt := range popped {
+		for _, oldElt := range uaq.Uslice {
+			if reflect.DeepEqual(elt, oldElt) {
+				t.Fatalf("pop n operation duplicated some elements")
+			}
+		}
+	}
+}
+
+func TestPopUnack(t *testing.T) {
+	uaq := initUnAckQueue()
+	initLen := len(uaq.Uslice)
+
+	popped := uaq.Pop()
+
+	if len(uaq.Uslice)+1 != initLen {
+		t.Fatalf("total length changed whith pop operation : had %d found %d after pop", initLen, len(uaq.Uslice)+1)
+	}
+	for _, oldElt := range uaq.Uslice {
+		if reflect.DeepEqual(popped, oldElt) {
+			t.Fatalf("pop n operation duplicated some elements")
+		}
+	}
+
+}
+
+func initUnAckQueue() stanza.UnAckQueue {
+	q := []*stanza.UnAckedStz{
+		{
+			Id: 1,
+			Stz: `<iq type='set'
+    from='romeo@montague.net/home'
+    to='characters.shakespeare.lit'
+    id='search2'
+    xml:lang='en'>
+  <query xmlns='jabber:iq:search'>
+    <last>Capulet</last>
+  </query>
+</iq>`,
+		},
+		{Id: 2,
+			Stz: `<iq type='get'
+    from='juliet@capulet.com/balcony'
+    to='characters.shakespeare.lit'
+    id='search3'
+    xml:lang='en'>
+  <query xmlns='jabber:iq:search'/>
+</iq>`},
+		{Id: 3,
+			Stz: `<iq type='set'
+    from='juliet@capulet.com/balcony'
+    to='characters.shakespeare.lit'
+    id='search4'
+    xml:lang='en'>
+  <query xmlns='jabber:iq:search'>
+    <x xmlns='jabber:x:data' type='submit'>
+      <field type='hidden' var='FORM_TYPE'>
+        <value>jabber:iq:search</value>
+      </field>
+      <field var='x-gender'>
+        <value>male</value>
+      </field>
+    </x>
+  </query>
+</iq>`},
+	}
+
+	return stanza.UnAckQueue{Uslice: q}
+
+}
+
+func init() {
+	rand.Seed(time.Now().UTC().UnixNano())
+}

stream_manager.go

@@ -25,7 +25,7 @@ import (
 // set callback and trigger reconnection.
 type StreamClient interface {
 	Connect() error
-	Resume(state SMState) error
+	Resume() error
 	Send(packet stanza.Packet) error
 	SendIQ(ctx context.Context, iq *stanza.IQ) (chan stanza.IQ, error)
 	SendRaw(packet string) error
@@ -75,9 +75,7 @@ func (sm *StreamManager) Run() error {
 	}
 
 	handler := func(e Event) error {
-		switch e.State {
+		switch e.State.state {
-		case StateConnected:
-			sm.Metrics.setConnectTime()
 		case StateSessionEstablished:
 			sm.Metrics.setLoginTime()
 		case StateDisconnected:
@@ -128,7 +126,7 @@ func (sm *StreamManager) resume(state SMState) error {
 		// TODO: Make it possible to define logger to log disconnect and reconnection attempts
 		sm.Metrics = initMetrics()
 
-		if err = sm.client.Resume(state); err != nil {
+		if err = sm.client.Resume(); err != nil {
 			var actualErr ConnError
 			if xerrors.As(err, &actualErr) {
 				if actualErr.Permanent {
@@ -152,11 +150,6 @@ func (sm *StreamManager) resume(state SMState) error {
 
 type Metrics struct {
 	startTime time.Time
-	// ConnectTime returns the duration between client initiation of the TCP/IP
-	// connection to the server and actual TCP/IP session establishment.
-	// This time includes DNS resolution and can be slightly higher if the DNS
-	// resolution result was not in cache.
-	ConnectTime time.Duration
 	// LoginTime returns the between client initiation of the TCP/IP
 	// connection to the server and the return of the login result.
 	// This includes ConnectTime, but also XMPP level protocol negotiation
@@ -172,10 +165,6 @@ func initMetrics() *Metrics {
 	}
 }
 
-func (m *Metrics) setConnectTime() {
-	m.ConnectTime = time.Since(m.startTime)
-}
-
 func (m *Metrics) setLoginTime() {
 	m.LoginTime = time.Since(m.startTime)
 }

tcp_server_mock.go

@@ -36,6 +36,10 @@ const (
 	testClientRawPort
 	testClientIqPort
 	testClientIqFailPort
+	testClientPostConnectHook
+
+	// Client internal tests
+	testClientStreamManagement
 )
 
 // ClientHandler is passed by the test client to provide custom behaviour to

xmpp_transport.go

@@ -24,6 +24,7 @@ type XMPPTransport struct {
 	readWriter    io.ReadWriter
 	logFile       io.Writer
 	isSecure      bool
+	// Used to close TCP connection when a stream close message is received from the server
 	closeChan chan stanza.StreamClosePacket
 }