Added callback to process errors after connection.

Added tests and refactored a bit.

_examples/xmpp_chat_client/xmpp_chat_client.go

@@ -0,0 +1,95 @@
+package main
+
+/*
+xmpp_chat_client is a demo client that connect on an XMPP server to chat with other members
+Note that this example sends to a very specific user. User logic is not implemented here.
+*/
+
+import (
+	. "bufio"
+	"fmt"
+	"os"
+
+	"gosrc.io/xmpp"
+	"gosrc.io/xmpp/stanza"
+)
+
+const (
+	currentUserAddress = "localhost:5222"
+	currentUserJid     = "testuser@localhost"
+	currentUserPass    = "testpass"
+	correspondantJid   = "testuser2@localhost"
+)
+
+func main() {
+	config := xmpp.Config{
+		TransportConfiguration: xmpp.TransportConfiguration{
+			Address: currentUserAddress,
+		},
+		Jid:        currentUserJid,
+		Credential: xmpp.Password(currentUserPass),
+		Insecure:   true}
+
+	var client *xmpp.Client
+	var err error
+	router := xmpp.NewRouter()
+	router.HandleFunc("message", handleMessage)
+	if client, err = xmpp.NewClient(config, router, errorHandler); err != nil {
+		fmt.Println("Error new client")
+	}
+
+	// Connecting client and handling messages
+	// To use a stream manager, just write something like this instead :
+	//cm := xmpp.NewStreamManager(client, startMessaging)
+	//log.Fatal(cm.Run()) //=> this will lock the calling goroutine
+
+	if err = client.Connect(); err != nil {
+		fmt.Printf("XMPP connection failed: %s", err)
+		return
+	}
+	startMessaging(client)
+
+}
+
+func startMessaging(client xmpp.Sender) {
+	reader := NewReader(os.Stdin)
+	textChan := make(chan string)
+	var text string
+	for {
+		fmt.Print("Enter text: ")
+		go readInput(reader, textChan)
+		select {
+		case <-killChan:
+			return
+		case text = <-textChan:
+			reply := stanza.Message{Attrs: stanza.Attrs{To: correspondantJid}, Body: text}
+			err := client.Send(reply)
+			if err != nil {
+				fmt.Printf("There was a problem sending the message : %v", reply)
+				return
+			}
+		}
+	}
+}
+
+func readInput(reader *Reader, textChan chan string) {
+	text, _ := reader.ReadString('\n')
+	textChan <- text
+}
+
+var killChan = make(chan struct{})
+
+// If an error occurs, this is used
+func errorHandler(err error) {
+	fmt.Printf("%v", err)
+	killChan <- struct{}{}
+}
+
+func handleMessage(s xmpp.Sender, p stanza.Packet) {
+	msg, ok := p.(stanza.Message)
+	if !ok {
+		_, _ = fmt.Fprintf(os.Stdout, "Ignoring packet: %T\n", p)
+		return
+	}
+	_, _ = fmt.Fprintf(os.Stdout, "Body = %s - from = %s\n", msg.Body, msg.From)
+}

_examples/xmpp_component/xmpp_component.go

@@ -35,7 +35,7 @@ func main() {
 		IQNamespaces("jabber:iq:version").
 		HandlerFunc(handleVersion)
 
-	component, err := xmpp.NewComponent(opts, router)
+	component, err := xmpp.NewComponent(opts, router, handleError)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}
@@ -47,6 +47,10 @@ func main() {
 	log.Fatal(cm.Run())
 }
 
+func handleError(err error) {
+	fmt.Println(err.Error())
+}
+
 func handleMessage(_ xmpp.Sender, p stanza.Packet) {
 	msg, ok := p.(stanza.Message)
 	if !ok {

_examples/xmpp_jukebox/xmpp_jukebox.go

@@ -53,7 +53,7 @@ func main() {
 			handleIQ(s, p, player)
 		})
 
-	client, err := xmpp.NewClient(config, router)
+	client, err := xmpp.NewClient(config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}
@@ -61,6 +61,9 @@ func main() {
 	cm := xmpp.NewStreamManager(client, nil)
 	log.Fatal(cm.Run())
 }
+func errorHandler(err error) {
+	fmt.Println(err.Error())
+}
 
 func handleMessage(s xmpp.Sender, p stanza.Packet, player *mpg123.Player) {
 	msg, ok := p.(stanza.Message)

_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)
+	client, err := xmpp.NewClient(config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}
@@ -39,6 +39,10 @@ func main() {
 	log.Fatal(cm.Run())
 }
 
+func errorHandler(err error) {
+	fmt.Println(err.Error())
+}
+
 func handleMessage(s xmpp.Sender, p stanza.Packet) {
 	msg, ok := p.(stanza.Message)
 	if !ok {

_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)
+	client, err := xmpp.NewClient(config, router, errorHandler)
 	if err != nil {
 		log.Fatalf("%+v", err)
 	}
@@ -37,6 +37,10 @@ func main() {
 	log.Fatal(cm.Run())
 }
 
+func errorHandler(err error) {
+	fmt.Println(err.Error())
+}
+
 func handleMessage(s xmpp.Sender, p stanza.Packet) {
 	msg, ok := p.(stanza.Message)
 	if !ok {

client.go

@@ -98,6 +98,8 @@ type Client struct {
 	router *Router
 	// Track and broadcast connection state
 	EventManager
+	// Handle errors from client execution
+	ErrorHandler func(error)
 }
 
 /*
@@ -107,7 +109,7 @@ 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.
 // Default the port to 5222.
-func NewClient(config Config, r *Router) (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
 	}
@@ -143,6 +145,7 @@ func NewClient(config Config, r *Router) (c *Client, err error) {
 	c = new(Client)
 	c.config = config
 	c.router = r
+	c.ErrorHandler = errorHandler
 
 	if c.config.ConnectTimeout == 0 {
 		c.config.ConnectTimeout = 15 // 15 second as default
@@ -191,10 +194,7 @@ func (c *Client) Resume(state SMState) error {
 	go keepalive(c.transport, c.config.KeepaliveInterval, keepaliveQuit)
 	// Start the receiver go routine
 	state = c.Session.SMState
-	// Leaving this channel here for later. Not used atm. We should return this instead of an error because right
+	go c.recv(state, keepaliveQuit)
-	// now the returned error is lost in limbo.
-	errChan := make(chan error)
-	go c.recv(state, keepaliveQuit, errChan)
 
 	// 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")
@@ -273,11 +273,11 @@ 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{}, errChan chan<- error) {
+func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
 	for {
 		val, err := stanza.NextPacket(c.transport.GetDecoder())
 		if err != nil {
-			errChan <- err
+			c.ErrorHandler(err)
 			close(keepaliveQuit)
 			c.disconnected(state)
 			return
@@ -289,7 +289,7 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}, errChan chan
 			c.router.route(c, val)
 			close(keepaliveQuit)
 			c.streamError(packet.Error.Local, packet.Text)
-			errChan <- errors.New("stream error: " + packet.Error.Local)
+			c.ErrorHandler(errors.New("stream error: " + packet.Error.Local))
 			return
 		// Process Stream management nonzas
 		case stanza.SMRequest:
@@ -299,7 +299,7 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}, errChan chan
 			}, H: state.Inbound}
 			err = c.Send(answer)
 			if err != nil {
-				errChan <- err
+				c.ErrorHandler(err)
 				return
 			}
 		default:

client_test.go

@@ -1,6 +1,7 @@
 package xmpp
 
 import (
+	"context"
 	"encoding/xml"
 	"errors"
 	"fmt"
@@ -15,8 +16,7 @@ const (
 	// Default port is not standard XMPP port to avoid interfering
 	// with local running XMPP server
 	testXMPPAddress  = "localhost:15222"
-
+	testClientDomain = "localhost"
-	defaultTimeout = 2 * time.Second
 )
 
 func TestEventManager(t *testing.T) {
@@ -40,7 +40,7 @@ func TestEventManager(t *testing.T) {
 func TestClient_Connect(t *testing.T) {
 	// Setup Mock server
 	mock := ServerMock{}
-	mock.Start(t, testXMPPAddress, handlerConnectSuccess)
+	mock.Start(t, testXMPPAddress, handlerClientConnectSuccess)
 
 	// Test / Check result
 	config := Config{
@@ -54,7 +54,7 @@ func TestClient_Connect(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router); err != nil {
+	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("connect create XMPP client: %s", err)
 	}
 
@@ -82,7 +82,7 @@ func TestClient_NoInsecure(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router); err != nil {
+	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("cannot create XMPP client: %s", err)
 	}
 
@@ -112,7 +112,7 @@ func TestClient_FeaturesTracking(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router); err != nil {
+	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("cannot create XMPP client: %s", err)
 	}
 
@@ -127,7 +127,7 @@ func TestClient_FeaturesTracking(t *testing.T) {
 func TestClient_RFC3921Session(t *testing.T) {
 	// Setup Mock server
 	mock := ServerMock{}
-	mock.Start(t, testXMPPAddress, handlerConnectWithSession)
+	mock.Start(t, testXMPPAddress, handlerClientConnectWithSession)
 
 	// Test / Check result
 	config := Config{
@@ -142,7 +142,7 @@ func TestClient_RFC3921Session(t *testing.T) {
 	var client *Client
 	var err error
 	router := NewRouter()
-	if client, err = NewClient(config, router); err != nil {
+	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
 		t.Errorf("connect create XMPP client: %s", err)
 	}
 
@@ -153,21 +153,227 @@ func TestClient_RFC3921Session(t *testing.T) {
 	mock.Stop()
 }
 
+// Testing sending an IQ to the mock server and reading its response.
+func TestClient_SendIQ(t *testing.T) {
+	done := make(chan struct{})
+	// Handler for Mock server
+	h := func(t *testing.T, c net.Conn) {
+		handlerClientConnectSuccess(t, c)
+		discardPresence(t, c)
+		respondToIQ(t, c)
+		done <- struct{}{}
+	}
+	client, mock := mockClientConnection(t, h, testClientIqPort)
+
+	ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
+	iqReq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, From: "test1@localhost/mremond-mbp", To: defaultServerName, Id: defaultStreamID, Lang: "en"})
+	disco := iqReq.DiscoInfo()
+	iqReq.Payload = disco
+
+	// Handle a possible error
+	errChan := make(chan error)
+	errorHandler := func(err error) {
+		errChan <- err
+	}
+	client.ErrorHandler = errorHandler
+	res, err := client.SendIQ(ctx, iqReq)
+	if err != nil {
+		t.Errorf(err.Error())
+	}
+
+	select {
+	case <-res: // If the server responds with an IQ, we pass the test
+	case err := <-errChan: // If the server sends an error, or there is a connection error
+		t.Errorf(err.Error())
+	case <-time.After(defaultChannelTimeout): // If we timeout
+		t.Errorf("Failed to receive response, to sent IQ, from mock server")
+	}
+	select {
+	case <-done:
+		mock.Stop()
+	case <-time.After(defaultChannelTimeout):
+		t.Errorf("The mock server failed to finish its job !")
+	}
+}
+
+func TestClient_SendIQFail(t *testing.T) {
+	done := make(chan struct{})
+	// Handler for Mock server
+	h := func(t *testing.T, c net.Conn) {
+		handlerClientConnectSuccess(t, c)
+		discardPresence(t, c)
+		respondToIQ(t, c)
+		done <- struct{}{}
+	}
+	client, mock := mockClientConnection(t, h, testClientIqFailPort)
+
+	//==================
+	// Create an IQ to send
+	ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
+	iqReq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, From: "test1@localhost/mremond-mbp", To: defaultServerName, Id: defaultStreamID, Lang: "en"})
+	disco := iqReq.DiscoInfo()
+	iqReq.Payload = disco
+	// Removing the id to make the stanza invalid. The IQ constructor makes a random one if none is specified
+	// so we need to overwrite it.
+	iqReq.Id = ""
+
+	// Handle a possible error
+	errChan := make(chan error)
+	errorHandler := func(err error) {
+		errChan <- err
+	}
+	client.ErrorHandler = errorHandler
+	res, _ := client.SendIQ(ctx, iqReq)
+
+	// Test
+	select {
+	case <-res: // If the server responds with an IQ
+		t.Errorf("Server should not respond with an IQ since the request is expected to be invalid !")
+	case <-errChan: // If the server sends an error, the test passes
+	case <-time.After(defaultChannelTimeout): // If we timeout
+		t.Errorf("Failed to receive response, to sent IQ, from mock server")
+	}
+	select {
+	case <-done:
+		mock.Stop()
+	case <-time.After(defaultChannelTimeout):
+		t.Errorf("The mock server failed to finish its job !")
+	}
+}
+
+func TestClient_SendRaw(t *testing.T) {
+	done := make(chan struct{})
+	// Handler for Mock server
+	h := func(t *testing.T, c net.Conn) {
+		handlerClientConnectSuccess(t, c)
+		discardPresence(t, c)
+		respondToIQ(t, c)
+		done <- struct{}{}
+	}
+	type testCase struct {
+		req       string
+		shouldErr bool
+		port      int
+	}
+	testRequests := make(map[string]testCase)
+	// Sending a correct IQ of type get. Not supposed to err
+	testRequests["Correct IQ"] = testCase{
+		req:       `<iq type="get" id="91bd0bba-012f-4d92-bb17-5fc41e6fe545" from="test1@localhost/mremond-mbp" to="testServer" lang="en"><query xmlns="http://jabber.org/protocol/disco#info"></query></iq>`,
+		shouldErr: false,
+		port:      testClientRawPort + 100,
+	}
+	// Sending an IQ with a missing ID. Should err
+	testRequests["IQ with missing ID"] = testCase{
+		req:       `<iq type="get" from="test1@localhost/mremond-mbp" to="testServer" lang="en"><query xmlns="http://jabber.org/protocol/disco#info"></query></iq>`,
+		shouldErr: true,
+		port:      testClientRawPort,
+	}
+
+	// A handler for the client.
+	// In the failing test, the server returns a stream error, which triggers this handler, client side.
+	errChan := make(chan error)
+	errHandler := func(err error) {
+		errChan <- err
+	}
+
+	// Tests for all the IQs
+	for name, tcase := range testRequests {
+		t.Run(name, func(st *testing.T) {
+			//Connecting to a mock server, initialized with given port and handler function
+			c, m := mockClientConnection(t, h, tcase.port)
+			c.ErrorHandler = errHandler
+			// Sending raw xml from test case
+			err := c.SendRaw(tcase.req)
+			if err != nil {
+				t.Errorf("Error sending Raw string")
+			}
+			// Just wait a little so the message has time to arrive
+			select {
+			// We don't use the default "long" timeout here because waiting it out means passing the test.
+			case <-time.After(100 * time.Millisecond):
+			case err = <-errChan:
+				if err == nil && tcase.shouldErr {
+					t.Errorf("Failed to get closing stream err")
+				} else if err != nil && !tcase.shouldErr {
+					t.Errorf("This test is not supposed to err !")
+				}
+			}
+			c.transport.Close()
+			select {
+			case <-done:
+				m.Stop()
+			case <-time.After(defaultChannelTimeout):
+				t.Errorf("The mock server failed to finish its job !")
+			}
+		})
+	}
+}
+
+func TestClient_Disconnect(t *testing.T) {
+	c, m := mockClientConnection(t, handlerClientConnectSuccess, testClientBasePort)
+	err := c.transport.Ping()
+	if err != nil {
+		t.Errorf("Could not ping but not disconnected yet")
+	}
+	c.Disconnect()
+	err = c.transport.Ping()
+	if err == nil {
+		t.Errorf("Did not disconnect properly")
+	}
+	m.Stop()
+}
+
+func TestClient_DisconnectStreamManager(t *testing.T) {
+	// Init mock server
+	// Setup Mock server
+	mock := ServerMock{}
+	mock.Start(t, testXMPPAddress, handlerAbortTLS)
+
+	// Test / Check result
+	config := Config{
+		TransportConfiguration: TransportConfiguration{
+			Address: testXMPPAddress,
+		},
+		Jid:        "test@localhost",
+		Credential: Password("test"),
+	}
+
+	var client *Client
+	var err error
+	router := NewRouter()
+	if client, err = NewClient(config, router, clientDefaultErrorHandler); err != nil {
+		t.Errorf("cannot create XMPP client: %s", err)
+	}
+
+	sman := NewStreamManager(client, nil)
+	errChan := make(chan error)
+	runSMan := func(errChan chan error) {
+		errChan <- sman.Run()
+	}
+
+	go runSMan(errChan)
+	select {
+	case <-errChan:
+	case <-time.After(defaultChannelTimeout):
+		// When insecure is not allowed:
+		t.Errorf("should fail as insecure connection is not allowed and server does not support TLS")
+	}
+	mock.Stop()
+}
+
 //=============================================================================
 // Basic XMPP Server Mock Handlers.
 
-const serverStreamOpen = "<?xml version='1.0'?><stream:stream to='%s' id='%s' xmlns='%s' xmlns:stream='%s' version='1.0'>"
-
 // Test connection with a basic straightforward workflow
-func handlerConnectSuccess(t *testing.T, c net.Conn) {
+func handlerClientConnectSuccess(t *testing.T, c net.Conn) {
 	decoder := xml.NewDecoder(c)
-	checkOpenStream(t, c, decoder)
+	checkClientOpenStream(t, c, decoder)
 
 	sendStreamFeatures(t, c, decoder) // Send initial features
 	readAuth(t, decoder)
 	fmt.Fprintln(c, "<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>")
 
-	checkOpenStream(t, c, decoder) // Reset stream
+	checkClientOpenStream(t, c, decoder) // Reset stream
 	sendBindFeature(t, c, decoder)       // Send post auth features
 	bind(t, c, decoder)
 }
@@ -175,26 +381,26 @@ func handlerConnectSuccess(t *testing.T, c net.Conn) {
 // We expect client will abort on TLS
 func handlerAbortTLS(t *testing.T, c net.Conn) {
 	decoder := xml.NewDecoder(c)
-	checkOpenStream(t, c, decoder)
+	checkClientOpenStream(t, c, decoder)
 	sendStreamFeatures(t, c, decoder) // Send initial features
 }
 
 // Test connection with mandatory session (RFC-3921)
-func handlerConnectWithSession(t *testing.T, c net.Conn) {
+func handlerClientConnectWithSession(t *testing.T, c net.Conn) {
 	decoder := xml.NewDecoder(c)
-	checkOpenStream(t, c, decoder)
+	checkClientOpenStream(t, c, decoder)
 
 	sendStreamFeatures(t, c, decoder) // Send initial features
 	readAuth(t, decoder)
 	fmt.Fprintln(c, "<success xmlns=\"urn:ietf:params:xml:ns:xmpp-sasl\"/>")
 
-	checkOpenStream(t, c, decoder)    // Reset stream
+	checkClientOpenStream(t, c, decoder) // Reset stream
 	sendRFC3921Feature(t, c, decoder)    // Send post auth features
 	bind(t, c, decoder)
 	session(t, c, decoder)
 }
 
-func checkOpenStream(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+func checkClientOpenStream(t *testing.T, c net.Conn, decoder *xml.Decoder) {
 	c.SetDeadline(time.Now().Add(defaultTimeout))
 	defer c.SetDeadline(time.Time{})
 
@@ -220,105 +426,35 @@ func checkOpenStream(t *testing.T, c net.Conn, decoder *xml.Decoder) {
 	}
 }
 
-func sendStreamFeatures(t *testing.T, c net.Conn, _ *xml.Decoder) {
+func mockClientConnection(t *testing.T, serverHandler func(*testing.T, net.Conn), port int) (*Client, ServerMock) {
-	// This is a basic server, supporting only 1 stream feature: SASL Plain Auth
+	mock := ServerMock{}
-	features := `<stream:features>
+	testServerAddress := fmt.Sprintf("%s:%d", testClientDomain, port)
-  <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+
-    <mechanism>PLAIN</mechanism>
+	mock.Start(t, testServerAddress, serverHandler)
-  </mechanisms>
+
-</stream:features>`
+	config := Config{
-	if _, err := fmt.Fprintln(c, features); err != nil {
+		TransportConfiguration: TransportConfiguration{
-		t.Errorf("cannot send stream feature: %s", err)
+			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)
 	}
+
+	if err = client.Connect(); err != nil {
+		t.Errorf("XMPP connection failed: %s", err)
+	}
+
+	return client, mock
 }
 
-// TODO return err in case of error reading the auth params
+// This really should not be used as is.
-func readAuth(t *testing.T, decoder *xml.Decoder) string {
+// It's just meant to be a placeholder when error handling is not needed at this level
-	se, err := stanza.NextStart(decoder)
+func clientDefaultErrorHandler(err error) {
-	if err != nil {
-		t.Errorf("cannot read auth: %s", err)
-		return ""
-	}
-
-	var nv interface{}
-	nv = &stanza.SASLAuth{}
-	// Decode element into pointer storage
-	if err = decoder.DecodeElement(nv, &se); err != nil {
-		t.Errorf("cannot decode auth: %s", err)
-		return ""
-	}
-
-	switch v := nv.(type) {
-	case *stanza.SASLAuth:
-		return v.Value
-	}
-	return ""
-}
-
-func sendBindFeature(t *testing.T, c net.Conn, _ *xml.Decoder) {
-	// This is a basic server, supporting only 1 stream feature after auth: resource binding
-	features := `<stream:features>
-  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
-</stream:features>`
-	if _, err := fmt.Fprintln(c, features); err != nil {
-		t.Errorf("cannot send stream feature: %s", err)
-	}
-}
-
-func sendRFC3921Feature(t *testing.T, c net.Conn, _ *xml.Decoder) {
-	// This is a basic server, supporting only 2 features after auth: resource & session binding
-	features := `<stream:features>
-  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
-  <session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>
-</stream:features>`
-	if _, err := fmt.Fprintln(c, features); err != nil {
-		t.Errorf("cannot send stream feature: %s", err)
-	}
-}
-
-func bind(t *testing.T, c net.Conn, decoder *xml.Decoder) {
-	se, err := stanza.NextStart(decoder)
-	if err != nil {
-		t.Errorf("cannot read bind: %s", err)
-		return
-	}
-
-	iq := &stanza.IQ{}
-	// Decode element into pointer storage
-	if err = decoder.DecodeElement(&iq, &se); err != nil {
-		t.Errorf("cannot decode bind iq: %s", err)
-		return
-	}
-
-	// TODO Check all elements
-	switch iq.Payload.(type) {
-	case *stanza.Bind:
-		result := `<iq id='%s' type='result'>
-  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
-  	<jid>%s</jid>
-  </bind>
-</iq>`
-		fmt.Fprintf(c, result, iq.Id, "test@localhost/test") // TODO use real JID
-	}
-}
-
-func session(t *testing.T, c net.Conn, decoder *xml.Decoder) {
-	se, err := stanza.NextStart(decoder)
-	if err != nil {
-		t.Errorf("cannot read session: %s", err)
-		return
-	}
-
-	iq := &stanza.IQ{}
-	// Decode element into pointer storage
-	if err = decoder.DecodeElement(&iq, &se); err != nil {
-		t.Errorf("cannot decode session iq: %s", err)
-		return
-	}
-
-	switch iq.Payload.(type) {
-	case *stanza.StreamSession:
-		result := `<iq id='%s' type='result'/>`
-		fmt.Fprintf(c, result, iq.Id)
-	}
 }

component.go

@@ -49,10 +49,11 @@ type Component struct {
 
 	// read / write
 	socketProxy  io.ReadWriter // TODO
+	ErrorHandler func(error)
 }
 
-func NewComponent(opts ComponentOptions, r *Router) (*Component, error) {
+func NewComponent(opts ComponentOptions, r *Router, errorHandler func(error)) (*Component, error) {
-	c := Component{ComponentOptions: opts, router: r}
+	c := Component{ComponentOptions: opts, router: r, ErrorHandler: errorHandler}
 	return &c, nil
 }
 
@@ -104,10 +105,7 @@ func (c *Component) Resume(sm SMState) error {
 	case stanza.Handshake:
 		// Start the receiver go routine
 		c.updateState(StateSessionEstablished)
-		// Leaving this channel here for later. Not used atm. We should return this instead of an error because right
+		go c.recv()
-		// now the returned error is lost in limbo.
-		errChan := make(chan error)
-		go c.recv(errChan) // Sends to errChan
 		return err // Should be empty at this point
 	default:
 		c.updateState(StatePermanentError)
@@ -128,13 +126,13 @@ func (c *Component) SetHandler(handler EventHandler) {
 }
 
 // Receiver Go routine receiver
-func (c *Component) recv(errChan chan<- error) {
+func (c *Component) recv() {
 
 	for {
 		val, err := stanza.NextPacket(c.transport.GetDecoder())
 		if err != nil {
 			c.updateState(StateDisconnected)
-			errChan <- err
+			c.ErrorHandler(err)
 			return
 		}
 		// Handle stream errors
@@ -142,7 +140,7 @@ func (c *Component) recv(errChan chan<- error) {
 		case stanza.StreamError:
 			c.router.route(c, val)
 			c.streamError(p.Error.Local, p.Text)
-			errChan <- errors.New("stream error: " + p.Error.Local)
+			c.ErrorHandler(errors.New("stream error: " + p.Error.Local))
 			return
 		}
 		c.router.route(c, val)

component_test.go

@@ -5,6 +5,7 @@ import (
 	"encoding/xml"
 	"errors"
 	"fmt"
+	"github.com/google/uuid"
 	"gosrc.io/xmpp/stanza"
 	"net"
 	"strings"
@@ -15,19 +16,7 @@ import (
 // Tests are ran in parallel, so each test creating a server must use a different port so we do not get any
 // conflict. Using iota for this should do the trick.
 const (
-	testComponentDomain  = "localhost"
+	defaultChannelTimeout = 5 * time.Second
-	defaultServerName    = "testServer"
-	defaultStreamID      = "91bd0bba-012f-4d92-bb17-5fc41e6fe545"
-	defaultComponentName = "Test Component"
-
-	// Default port is not standard XMPP port to avoid interfering
-	// with local running XMPP server
-	testHandshakePort = iota + 15222
-	testDecoderPort
-	testSendIqPort
-	testSendRawPort
-	testDisconnectPort
-	testSManDisconnectPort
 )
 
 func TestHandshake(t *testing.T) {
@@ -48,16 +37,14 @@ func TestHandshake(t *testing.T) {
 
 // Tests connection process with a handshake exchange
 // Tests multiple session IDs. All connections should generate a unique stream ID
-func TestGenerateHandshake(t *testing.T) {
+func TestGenerateHandshakeId(t *testing.T) {
 	// 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
-	var uuidsArray = [5]string{
+	var uuidsArray = [5]string{}
-		"cc9b3249-9582-4780-825f-4311b42f9b0e",
+	for i := 1; i < len(uuidsArray); i++ {
-		"bba8be3c-d98e-4e26-b9bb-9ed34578a503",
+		id, _ := uuid.NewRandom()
-		"dae72822-80e8-496b-b763-ab685f53a188",
+		uuidsArray[i] = id.String()
-		"a45d6c06-de49-4bb0-935b-1a2201b71028",
-		"7dc6924f-0eca-4237-9898-18654b8d891e",
 	}
 
 	// Channel to pass stream IDs as a queue
@@ -95,7 +82,7 @@ func TestGenerateHandshake(t *testing.T) {
 		Type:     "service",
 	}
 	router := NewRouter()
-	c, err := NewComponent(opts, router)
+	c, err := NewComponent(opts, router, componentDefaultErrorHandler)
 	if err != nil {
 		t.Errorf("%+v", err)
 	}
@@ -126,7 +113,7 @@ func TestStreamManager(t *testing.T) {
 // The decoder is expected to be built after a valid connection
 // Based on the xmpp_component example.
 func TestDecoder(t *testing.T) {
-	c, _ := mockConnection(t, testDecoderPort, handlerForComponentHandshakeDefaultID)
+	c, _ := mockComponentConnection(t, testDecoderPort, handlerForComponentHandshakeDefaultID)
 	if c.transport.GetDecoder() == nil {
 		t.Errorf("Failed to initialize decoder. Decoder is nil.")
 	}
@@ -134,39 +121,103 @@ 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{})
+	h := func(t *testing.T, c net.Conn) {
+		handlerForComponentIQSend(t, c)
+		done <- struct{}{}
+	}
+
 	//Connecting to a mock server, initialized with given port and handler function
-	c, m := mockConnection(t, testSendIqPort, handlerForComponentIQSend)
+	c, m := mockComponentConnection(t, testSendIqPort, h)
 
 	ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
 	iqReq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, From: "test1@localhost/mremond-mbp", To: defaultServerName, Id: defaultStreamID, Lang: "en"})
 	disco := iqReq.DiscoInfo()
 	iqReq.Payload = disco
 
+	// Handle a possible error
+	errChan := make(chan error)
+	errorHandler := func(err error) {
+		errChan <- err
+	}
+	c.ErrorHandler = errorHandler
+
 	var res chan stanza.IQ
 	res, _ = c.SendIQ(ctx, iqReq)
 
 	select {
 	case <-res:
-	case <-time.After(100 * time.Millisecond):
+	case err := <-errChan:
+		t.Errorf(err.Error())
+	case <-time.After(defaultChannelTimeout):
 		t.Errorf("Failed to receive response, to sent IQ, from mock server")
 	}
 
+	select {
+	case <-done:
 		m.Stop()
+	case <-time.After(defaultChannelTimeout):
+		t.Errorf("The mock server failed to finish its job !")
+	}
+}
+
+// Checking that error handling is done properly client side when an invalid IQ is sent and the server responds in kind.
+func TestSendIqFail(t *testing.T) {
+	done := make(chan struct{})
+	h := func(t *testing.T, c net.Conn) {
+		handlerForComponentIQSend(t, c)
+		done <- struct{}{}
+	}
+	//Connecting to a mock server, initialized with given port and handler function
+	c, m := mockComponentConnection(t, testSendIqFailPort, h)
+
+	ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
+	iqReq := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeGet, From: "test1@localhost/mremond-mbp", To: defaultServerName, Id: defaultStreamID, Lang: "en"})
+
+	// Removing the id to make the stanza invalid. The IQ constructor makes a random one if none is specified
+	// so we need to overwrite it.
+	iqReq.Id = ""
+	disco := iqReq.DiscoInfo()
+	iqReq.Payload = disco
+
+	errChan := make(chan error)
+	errorHandler := func(err error) {
+		errChan <- err
+	}
+	c.ErrorHandler = errorHandler
+
+	var res chan stanza.IQ
+	res, _ = c.SendIQ(ctx, iqReq)
+
+	select {
+	case r := <-res: // Do we get an IQ response from the server ?
+		t.Errorf("We should not be getting an IQ response here : this should fail !")
+		fmt.Println(r)
+	case <-errChan: // Do we get a stream error from the server ?
+		// If we get an error from the server, the test passes.
+	case <-time.After(defaultChannelTimeout): // Timeout ?
+		t.Errorf("Failed to receive response, to sent IQ, from mock server")
+	}
+
+	select {
+	case <-done:
+		m.Stop()
+	case <-time.After(defaultChannelTimeout):
+		t.Errorf("The mock server failed to finish its job !")
+	}
 }
 
 // Tests sending raw xml to the mock server.
-// TODO : check the server response client side ?
 // Right now, the server response is not checked and an err is passed in a channel if the test is supposed to err.
 // In this test, we use IQs
 func TestSendRaw(t *testing.T) {
-	// Error channel for the handler
+	done := make(chan struct{})
-	errChan := make(chan error)
 	// Handler for the mock server
 	h := func(t *testing.T, c net.Conn) {
 		// Completes the connection by exchanging handshakes
 		handlerForComponentHandshakeDefaultID(t, c)
-		receiveRawIq(t, c, errChan)
+		receiveIq(c, xml.NewDecoder(c))
-		return
+		done <- struct{}{}
 	}
 
 	type testCase struct {
@@ -185,12 +236,19 @@ func TestSendRaw(t *testing.T) {
 		shouldErr: true,
 	}
 
+	// A handler for the component.
+	// In the failing test, the server returns a stream error, which triggers this handler, component side.
+	errChan := make(chan error)
+	errHandler := func(err error) {
+		errChan <- err
+	}
+
 	// Tests for all the IQs
 	for name, tcase := range testRequests {
 		t.Run(name, func(st *testing.T) {
 			//Connecting to a mock server, initialized with given port and handler function
-			c, m := mockConnection(t, testSendRawPort, h)
+			c, m := mockComponentConnection(t, testSendRawPort, h)
-
+			c.ErrorHandler = errHandler
 			// Sending raw xml from test case
 			err := c.SendRaw(tcase.req)
 			if err != nil {
@@ -198,21 +256,29 @@ func TestSendRaw(t *testing.T) {
 			}
 			// Just wait a little so the message has time to arrive
 			select {
-			case <-time.After(100 * time.Millisecond):
+			// We don't use the default "long" timeout here because waiting it out means passing the test.
+			case <-time.After(200 * time.Millisecond):
 			case err = <-errChan:
 				if err == nil && tcase.shouldErr {
 					t.Errorf("Failed to get closing stream err")
+				} else if err != nil && !tcase.shouldErr {
+					t.Errorf("This test is not supposed to err ! => %s", err.Error())
 				}
 			}
 			c.transport.Close()
+			select {
+			case <-done:
 				m.Stop()
+			case <-time.After(defaultChannelTimeout):
+				t.Errorf("The mock server failed to finish its job !")
+			}
 		})
 	}
 }
 
 // Tests the Disconnect method for Components
 func TestDisconnect(t *testing.T) {
-	c, m := mockConnection(t, testDisconnectPort, handlerForComponentHandshakeDefaultID)
+	c, m := mockComponentConnection(t, testDisconnectPort, handlerForComponentHandshakeDefaultID)
 	err := c.transport.Ping()
 	if err != nil {
 		t.Errorf("Could not ping but not disconnected yet")
@@ -257,14 +323,97 @@ func TestStreamManagerDisconnect(t *testing.T) {
 
 //=============================================================================
 // Basic XMPP Server Mock Handlers.
-// Performs a Component connection with a handshake. It uses a default ID defined in this file as a constant.
+
-// Used in the mock server as a Handler
+//===============================
-func handlerForComponentHandshakeDefaultID(t *testing.T, c net.Conn) {
+// Init mock server and connection
-	decoder := xml.NewDecoder(c)
+// Creating a mock server and connecting a Component to it. Initialized with given port and handler function
-	checkOpenStreamHandshakeDefaultID(t, c, decoder)
+// The Component and mock are both returned
-	readHandshakeComponent(t, decoder)
+func mockComponentConnection(t *testing.T, port int, handler func(t *testing.T, c net.Conn)) (*Component, *ServerMock) {
-	fmt.Fprintln(c, "<handshake/>") // That's all the server needs to return (see xep-0114)
+	// Init mock server
+	testComponentAddress := fmt.Sprintf("%s:%d", testComponentDomain, port)
+	mock := ServerMock{}
+	mock.Start(t, testComponentAddress, handler)
+
+	//==================================
+	// Create Component to connect to it
+	c := makeBasicComponent(defaultComponentName, testComponentAddress, t)
+
+	//========================================
+	// Connect the new Component to the server
+	err := c.Connect()
+	if err != nil {
+		t.Errorf("%+v", err)
+	}
+
+	return c, &mock
+}
+
+func makeBasicComponent(name string, mockServerAddr string, t *testing.T) *Component {
+	opts := ComponentOptions{
+		TransportConfiguration: TransportConfiguration{
+			Address: mockServerAddr,
+			Domain:  "localhost",
+		},
+		Domain:   testComponentDomain,
+		Secret:   "mypass",
+		Name:     name,
+		Category: "gateway",
+		Type:     "service",
+	}
+	router := NewRouter()
+	c, err := NewComponent(opts, router, componentDefaultErrorHandler)
+	if err != nil {
+		t.Errorf("%+v", err)
+	}
+	c.transport, err = NewComponentTransport(c.ComponentOptions.TransportConfiguration)
+	if err != nil {
+		t.Errorf("%+v", err)
+	}
+	return c
+}
+
+// This really should not be used as is.
+// It's just meant to be a placeholder when error handling is not needed at this level
+func componentDefaultErrorHandler(err error) {
+
+}
+
+// Sends IQ response to Component request.
+// No parsing of the request here. We just check that it's valid, and send the default response.
+func handlerForComponentIQSend(t *testing.T, c net.Conn) {
+	// Completes the connection by exchanging handshakes
+	handlerForComponentHandshakeDefaultID(t, c)
+	respondToIQ(t, c)
+}
+
+// Used for ID and handshake related tests
+func checkOpenStreamHandshakeID(t *testing.T, c net.Conn, decoder *xml.Decoder, streamID string) {
+	c.SetDeadline(time.Now().Add(defaultTimeout))
+	defer c.SetDeadline(time.Time{})
+
+	for { // TODO clean up. That for loop is not elegant and I prefer bounded recursion.
+		token, err := decoder.Token()
+		if err != nil {
+			t.Errorf("cannot read next token: %s", err)
+		}
+
+		switch elem := token.(type) {
+		// Wait for first startElement
+		case xml.StartElement:
+			if elem.Name.Space != stanza.NSStream || elem.Name.Local != "stream" {
+				err = errors.New("xmpp: expected <stream> but got <" + elem.Name.Local + "> in " + elem.Name.Space)
 				return
+			}
+			if _, err := fmt.Fprintf(c, serverStreamOpen, "localhost", streamID, stanza.NSComponent, stanza.NSStream); err != nil {
+				t.Errorf("cannot write server stream open: %s", err)
+			}
+			return
+		}
+	}
+}
+
+func checkOpenStreamHandshakeDefaultID(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+	checkOpenStreamHandshakeID(t, c, decoder, defaultStreamID)
 }
 
 // Performs a Component connection with a handshake. It uses a default ID defined in this file as a constant.
@@ -303,152 +452,12 @@ func readHandshakeComponent(t *testing.T, decoder *xml.Decoder) {
 	}
 }
 
-func checkOpenStreamHandshakeDefaultID(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+// Performs a Component connection with a handshake. It uses a default ID defined in this file as a constant.
-	checkOpenStreamHandshakeID(t, c, decoder, defaultStreamID)
+// Used in the mock server as a Handler
-}
+func handlerForComponentHandshakeDefaultID(t *testing.T, c net.Conn) {
-
-// Used for ID and handshake related tests
-func checkOpenStreamHandshakeID(t *testing.T, c net.Conn, decoder *xml.Decoder, streamID string) {
-	c.SetDeadline(time.Now().Add(defaultTimeout))
-	defer c.SetDeadline(time.Time{})
-
-	for { // TODO clean up. That for loop is not elegant and I prefer bounded recursion.
-		token, err := decoder.Token()
-		if err != nil {
-			t.Errorf("cannot read next token: %s", err)
-		}
-
-		switch elem := token.(type) {
-		// Wait for first startElement
-		case xml.StartElement:
-			if elem.Name.Space != stanza.NSStream || elem.Name.Local != "stream" {
-				err = errors.New("xmpp: expected <stream> but got <" + elem.Name.Local + "> in " + elem.Name.Space)
-				return
-			}
-			if _, err := fmt.Fprintf(c, serverStreamOpen, "localhost", streamID, stanza.NSComponent, stanza.NSStream); err != nil {
-				t.Errorf("cannot write server stream open: %s", err)
-			}
-			return
-		}
-	}
-}
-
-//=============================================================================
-// Sends IQ response to Component request.
-// No parsing of the request here. We just check that it's valid, and send the default response.
-func handlerForComponentIQSend(t *testing.T, c net.Conn) {
-	// Completes the connection by exchanging handshakes
-	handlerForComponentHandshakeDefaultID(t, c)
-
-	// Decoder to parse the request
 	decoder := xml.NewDecoder(c)
-
+	checkOpenStreamHandshakeDefaultID(t, c, decoder)
-	iqReq, err := receiveIq(t, c, decoder)
+	readHandshakeComponent(t, decoder)
-	if err != nil {
+	fmt.Fprintln(c, "<handshake/>") // That's all the server needs to return (see xep-0114)
-		t.Errorf("Error receiving the IQ stanza : %v", err)
-	} else if !iqReq.IsValid() {
-		t.Errorf("server received an IQ stanza : %v", iqReq)
-	}
-
-	// Crafting response
-	iqResp := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: iqReq.To, To: iqReq.From, Id: iqReq.Id, Lang: "en"})
-	disco := iqResp.DiscoInfo()
-	disco.AddFeatures("vcard-temp",
-		`http://jabber.org/protocol/address`)
-
-	disco.AddIdentity("Multicast", "service", "multicast")
-	iqResp.Payload = disco
-
-	// Sending response to the Component
-	mResp, err := xml.Marshal(iqResp)
-	_, err = fmt.Fprintln(c, string(mResp))
-	if err != nil {
-		t.Errorf("Could not send response stanza : %s", err)
-	}
 	return
 }
-
-// Reads next request coming from the Component. Expecting it to be an IQ request
-func receiveIq(t *testing.T, c net.Conn, decoder *xml.Decoder) (stanza.IQ, error) {
-	c.SetDeadline(time.Now().Add(defaultTimeout))
-	defer c.SetDeadline(time.Time{})
-	var iqStz stanza.IQ
-	err := decoder.Decode(&iqStz)
-	if err != nil {
-		t.Errorf("cannot read the received IQ stanza: %s", err)
-	}
-	if !iqStz.IsValid() {
-		t.Errorf("received IQ stanza is invalid : %s", err)
-	}
-	return iqStz, nil
-}
-
-func receiveRawIq(t *testing.T, c net.Conn, errChan chan error) {
-	c.SetDeadline(time.Now().Add(defaultTimeout))
-	defer c.SetDeadline(time.Time{})
-	decoder := xml.NewDecoder(c)
-	var iq stanza.IQ
-	err := decoder.Decode(&iq)
-	if err != nil || !iq.IsValid() {
-		s := stanza.StreamError{
-			XMLName: xml.Name{Local: "stream:error"},
-			Error:   xml.Name{Local: "xml-not-well-formed"},
-			Text:    `XML was not well-formed`,
-		}
-		raw, _ := xml.Marshal(s)
-		fmt.Fprintln(c, string(raw))
-		fmt.Fprintln(c, `</stream:stream>`) // TODO : check this client side
-		errChan <- fmt.Errorf("invalid xml")
-		return
-	}
-	errChan <- nil
-	return
-}
-
-//===============================
-// Init mock server and connection
-// Creating a mock server and connecting a Component to it. Initialized with given port and handler function
-// The Component and mock are both returned
-func mockConnection(t *testing.T, port int, handler func(t *testing.T, c net.Conn)) (*Component, *ServerMock) {
-	// Init mock server
-	testComponentAddress := fmt.Sprintf("%s:%d", testComponentDomain, port)
-	mock := ServerMock{}
-	mock.Start(t, testComponentAddress, handler)
-
-	//==================================
-	// Create Component to connect to it
-	c := makeBasicComponent(defaultComponentName, testComponentAddress, t)
-
-	//========================================
-	// Connect the new Component to the server
-	err := c.Connect()
-	if err != nil {
-		t.Errorf("%+v", err)
-	}
-
-	return c, &mock
-}
-
-func makeBasicComponent(name string, mockServerAddr string, t *testing.T) *Component {
-	opts := ComponentOptions{
-		TransportConfiguration: TransportConfiguration{
-			Address: mockServerAddr,
-			Domain:  "localhost",
-		},
-		Domain:   testComponentDomain,
-		Secret:   "mypass",
-		Name:     name,
-		Category: "gateway",
-		Type:     "service",
-	}
-	router := NewRouter()
-	c, err := NewComponent(opts, router)
-	if err != nil {
-		t.Errorf("%+v", err)
-	}
-	c.transport, err = NewComponentTransport(c.ComponentOptions.TransportConfiguration)
-	if err != nil {
-		t.Errorf("%+v", err)
-	}
-	return c
-}

tcp_server_mock.go

@@ -1,12 +1,42 @@
 package xmpp
 
 import (
+	"encoding/xml"
+	"fmt"
+	"gosrc.io/xmpp/stanza"
 	"net"
 	"testing"
+	"time"
 )
 
 //=============================================================================
 // TCP Server Mock
+const (
+	defaultTimeout       = 2 * time.Second
+	testComponentDomain  = "localhost"
+	defaultServerName    = "testServer"
+	defaultStreamID      = "91bd0bba-012f-4d92-bb17-5fc41e6fe545"
+	defaultComponentName = "Test Component"
+	serverStreamOpen     = "<?xml version='1.0'?><stream:stream to='%s' id='%s' xmlns='%s' xmlns:stream='%s' version='1.0'>"
+
+	// Default port is not standard XMPP port to avoid interfering
+	// with local running XMPP server
+
+	// Component tests
+	testHandshakePort = iota + 15222
+	testDecoderPort
+	testSendIqPort
+	testSendIqFailPort
+	testSendRawPort
+	testDisconnectPort
+	testSManDisconnectPort
+
+	// Client tests
+	testClientBasePort
+	testClientRawPort
+	testClientIqPort
+	testClientIqFailPort
+)
 
 // ClientHandler is passed by the test client to provide custom behaviour to
 // the TCP server mock. This allows customizing the server behaviour to allow
@@ -81,3 +111,180 @@ func (mock *ServerMock) loop() {
 		go mock.handler(mock.t, conn)
 	}
 }
+
+//======================================================================================================================
+// A few functions commonly used for tests. Trying to avoid duplicates in client and component test files.
+//======================================================================================================================
+
+func respondToIQ(t *testing.T, c net.Conn) {
+	// Decoder to parse the request
+	decoder := xml.NewDecoder(c)
+
+	iqReq, err := receiveIq(c, decoder)
+	if err != nil {
+		t.Fatalf("failed to receive IQ : %s", err.Error())
+	}
+
+	if !iqReq.IsValid() {
+		mockIQError(c)
+		return
+	}
+
+	// Crafting response
+	iqResp := stanza.NewIQ(stanza.Attrs{Type: stanza.IQTypeResult, From: iqReq.To, To: iqReq.From, Id: iqReq.Id, Lang: "en"})
+	disco := iqResp.DiscoInfo()
+	disco.AddFeatures("vcard-temp",
+		`http://jabber.org/protocol/address`)
+
+	disco.AddIdentity("Multicast", "service", "multicast")
+	iqResp.Payload = disco
+
+	// Sending response to the Component
+	mResp, err := xml.Marshal(iqResp)
+	_, err = fmt.Fprintln(c, string(mResp))
+	if err != nil {
+		t.Errorf("Could not send response stanza : %s", err)
+	}
+	return
+}
+
+// When a presence stanza is automatically sent (right now it's the case in the client), we may want to discard it
+// and test further stanzas.
+func discardPresence(t *testing.T, c net.Conn) {
+	decoder := xml.NewDecoder(c)
+	c.SetDeadline(time.Now().Add(defaultTimeout))
+	defer c.SetDeadline(time.Time{})
+	var presenceStz stanza.Presence
+	err := decoder.Decode(&presenceStz)
+	if err != nil {
+		t.Errorf("Expected presence but this happened : %s", err.Error())
+	}
+}
+
+// Reads next request coming from the Component. Expecting it to be an IQ request
+func receiveIq(c net.Conn, decoder *xml.Decoder) (*stanza.IQ, error) {
+	c.SetDeadline(time.Now().Add(defaultTimeout))
+	defer c.SetDeadline(time.Time{})
+	var iqStz stanza.IQ
+	err := decoder.Decode(&iqStz)
+	if err != nil {
+		return nil, err
+	}
+	return &iqStz, nil
+}
+
+// Should be used in server handlers when an IQ sent by a client or component is invalid.
+// This responds as expected from a "real" server, aside from the error message.
+func mockIQError(c net.Conn) {
+	s := stanza.StreamError{
+		XMLName: xml.Name{Local: "stream:error"},
+		Error:   xml.Name{Local: "xml-not-well-formed"},
+		Text:    `XML was not well-formed`,
+	}
+	raw, _ := xml.Marshal(s)
+	fmt.Fprintln(c, string(raw))
+	fmt.Fprintln(c, `</stream:stream>`)
+}
+
+func sendStreamFeatures(t *testing.T, c net.Conn, _ *xml.Decoder) {
+	// This is a basic server, supporting only 1 stream feature: SASL Plain Auth
+	features := `<stream:features>
+  <mechanisms xmlns="urn:ietf:params:xml:ns:xmpp-sasl">
+    <mechanism>PLAIN</mechanism>
+  </mechanisms>
+</stream:features>`
+	if _, err := fmt.Fprintln(c, features); err != nil {
+		t.Errorf("cannot send stream feature: %s", err)
+	}
+}
+
+// TODO return err in case of error reading the auth params
+func readAuth(t *testing.T, decoder *xml.Decoder) string {
+	se, err := stanza.NextStart(decoder)
+	if err != nil {
+		t.Errorf("cannot read auth: %s", err)
+		return ""
+	}
+
+	var nv interface{}
+	nv = &stanza.SASLAuth{}
+	// Decode element into pointer storage
+	if err = decoder.DecodeElement(nv, &se); err != nil {
+		t.Errorf("cannot decode auth: %s", err)
+		return ""
+	}
+
+	switch v := nv.(type) {
+	case *stanza.SASLAuth:
+		return v.Value
+	}
+	return ""
+}
+
+func sendBindFeature(t *testing.T, c net.Conn, _ *xml.Decoder) {
+	// This is a basic server, supporting only 1 stream feature after auth: resource binding
+	features := `<stream:features>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
+</stream:features>`
+	if _, err := fmt.Fprintln(c, features); err != nil {
+		t.Errorf("cannot send stream feature: %s", err)
+	}
+}
+
+func sendRFC3921Feature(t *testing.T, c net.Conn, _ *xml.Decoder) {
+	// This is a basic server, supporting only 2 features after auth: resource & session binding
+	features := `<stream:features>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'/>
+  <session xmlns='urn:ietf:params:xml:ns:xmpp-session'/>
+</stream:features>`
+	if _, err := fmt.Fprintln(c, features); err != nil {
+		t.Errorf("cannot send stream feature: %s", err)
+	}
+}
+
+func bind(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+	se, err := stanza.NextStart(decoder)
+	if err != nil {
+		t.Errorf("cannot read bind: %s", err)
+		return
+	}
+
+	iq := &stanza.IQ{}
+	// Decode element into pointer storage
+	if err = decoder.DecodeElement(&iq, &se); err != nil {
+		t.Errorf("cannot decode bind iq: %s", err)
+		return
+	}
+
+	// TODO Check all elements
+	switch iq.Payload.(type) {
+	case *stanza.Bind:
+		result := `<iq id='%s' type='result'>
+  <bind xmlns='urn:ietf:params:xml:ns:xmpp-bind'>
+  	<jid>%s</jid>
+  </bind>
+</iq>`
+		fmt.Fprintf(c, result, iq.Id, "test@localhost/test") // TODO use real JID
+	}
+}
+
+func session(t *testing.T, c net.Conn, decoder *xml.Decoder) {
+	se, err := stanza.NextStart(decoder)
+	if err != nil {
+		t.Errorf("cannot read session: %s", err)
+		return
+	}
+
+	iq := &stanza.IQ{}
+	// Decode element into pointer storage
+	if err = decoder.DecodeElement(&iq, &se); err != nil {
+		t.Errorf("cannot decode session iq: %s", err)
+		return
+	}
+
+	switch iq.Payload.(type) {
+	case *stanza.StreamSession:
+		result := `<iq id='%s' type='result'/>`
+		fmt.Fprintf(c, result, iq.Id)
+	}
+}