Changed "Disconnect" to wait for the closing stream tag. (#141)

Updated example with a README.md and fixed some logs.

_examples/xmpp_chat_client/README.md

@@ -0,0 +1,51 @@
+# Chat TUI example
+This is a simple chat example, with a TUI.   
+It shows the library usage and a few of its capabilities. 
+## How to run
+### Build
+You can build the client using : 
+```
+    go build -o example_client
+```
+and then run with (on unix for example): 
+```
+    ./example_client
+```
+or you can simply build + run in one command while at the example directory root, like this:
+```
+    go run xmpp_chat_client.go interface.go 
+```
+
+### Configuration
+The example needs a configuration file to run. A sample file is provided.  
+By default, the example will look for a file named "config" in the current directory.
+To provide a different configuration file, pass the following argument to the example :
+```
+    go run xmpp_chat_client.go interface.go -c /path/to/config
+```
+where /path/to/config is the path to the directory containing the configuration file. The configuration file must be named 
+"config" and be using the yaml format.  
+  
+Required fields are :
+```yaml
+Server :
+  - full_address: "localhost:5222"
+Client : # This is you
+  - jid: "testuser2@localhost"
+  - pass: "pass123" #Password in a config file yay
+
+# Contacts list, ";" separated
+Contacts : "testuser1@localhost;testuser3@localhost"
+# Should we log stanzas ?  
+LogStanzas:
+  - logger_on: "true"
+  - logfile_path: "./logs" # Path to directory, not file.
+```
+
+## How to use
+Shortcuts :   
+    - ctrl+space  : switch between input window and menu window.  
+    - While in input window :  
+        - enter : sends a message if in message mode (see menu options)  
+        - ctrl+e : sends a raw stanza when in raw mode (see menu options)    
+    - ctrl+c : quit  

_examples/xmpp_chat_client/config.yml

@@ -1,9 +1,7 @@
-# Default config for the client
+# Sample config for the client
 Server :
   - full_address: "localhost:5222"
-  - port: 5222
 Client :
-  - name: "testuser2"
   - jid: "testuser2@localhost"
   - pass: "pass123" #Password in a config file yay
 

_examples/xmpp_chat_client/interface.go

@@ -17,6 +17,13 @@ const (
 	menuWindow         = "mw"  // Where the menu is shown
 	disconnectMsg      = "msg"
 
+	// Windows titles
+	chatLogWindowTitle      = "Chat log"
+	menuWindowTitle         = "Menu"
+	chatInputWindowTitle    = "Write a message :"
+	rawInputWindowTitle     = "Write or paste a raw stanza. Press \"Ctrl+E\" to send :"
+	contactsListWindowTitle = "Contacts"
+
 	// Menu options
 	disconnect         = "Disconnect"
 	askServerForRoster = "Ask server for roster"
@@ -60,7 +67,7 @@ func layout(g *gocui.Gui) error {
 		if !gocui.IsUnknownView(err) {
 			return err
 		}
-		v.Title = "Chat log"
+		v.Title = chatLogWindowTitle
 		v.Wrap = true
 		v.Autoscroll = true
 	}
@@ -69,7 +76,7 @@ func layout(g *gocui.Gui) error {
 		if !gocui.IsUnknownView(err) {
 			return err
 		}
-		v.Title = "Contacts"
+		v.Title = contactsListWindowTitle
 		v.Wrap = true
 		// If we set this to true, the contacts list will "fit" in the window but if the number
 		// of contacts exceeds the maximum height, some contacts will be hidden...
@@ -82,7 +89,7 @@ func layout(g *gocui.Gui) error {
 		if !gocui.IsUnknownView(err) {
 			return err
 		}
-		v.Title = "Menu"
+		v.Title = menuWindowTitle
 		v.Wrap = true
 		v.Autoscroll = true
 		fmt.Fprint(v, strings.Join(menuOptions, "\n"))
@@ -95,7 +102,7 @@ func layout(g *gocui.Gui) error {
 		if !gocui.IsUnknownView(err) {
 			return err
 		}
-		v.Title = "Write or paste a raw stanza. Press \"Ctrl+E\" to send :"
+		v.Title = rawInputWindowTitle
 		v.Editable = true
 		v.Wrap = true
 	}
@@ -104,7 +111,7 @@ func layout(g *gocui.Gui) error {
 		if !gocui.IsUnknownView(err) {
 			return err
 		}
-		v.Title = "Write a message :"
+		v.Title = chatInputWindowTitle
 		v.Editable = true
 		v.Wrap = true
 

_examples/xmpp_chat_client/xmpp_chat_client.go

@@ -63,7 +63,7 @@ func main() {
 	// ============================================================
 	// Parse the flag with the config directory path as argument
 	flag.String("c", defaultConfigFilePath, "Provide a path to the directory that contains the configuration"+
-		" file you want to use. Config file should be named \"config\" and be of YAML format..")
+		" file you want to use. Config file should be named \"config\" and be in YAML format..")
 	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
 	pflag.Parse()
 
@@ -139,7 +139,8 @@ func startClient(g *gocui.Gui, config *config) {
 	handlerWithGui := func(_ xmpp.Sender, p stanza.Packet) {
 		msg, ok := p.(stanza.Message)
 		if logger != nil {
-			logger.Println(msg)
+			m, _ := xml.Marshal(msg)
+			logger.Println(string(m))
 		}
 
 		v, err := g.View(chatLogWindow)
@@ -209,7 +210,7 @@ func startMessaging(client xmpp.Sender, config *config, g *gocui.Gui) {
 			}
 			return
 		case text = <-textChan:
-			reply := stanza.Message{Attrs: stanza.Attrs{To: correspondent, From: config.Client[clientJid], Type: stanza.MessageTypeChat}, Body: text}
+			reply := stanza.Message{Attrs: stanza.Attrs{To: correspondent, Type: stanza.MessageTypeChat}, Body: text}
 			if logger != nil {
 				raw, _ := xml.Marshal(reply)
 				logger.Println(string(raw))
@@ -284,6 +285,8 @@ func errorHandler(err error) {
 // If user tries to send a message to someone not registered with the server, the server will return an error.
 func updateRosterFromConfig(g *gocui.Gui, config *config) {
 	viewState.contacts = append(strings.Split(config.Contacts, configContactSep), backFromContacts)
+	// Put a "go back" button at the end of the list
+	viewState.contacts = append(viewState.contacts, backFromContacts)
 }
 
 // Updates the menu panel of the view with the current user's roster, by asking the server.
@@ -318,6 +321,7 @@ func askForRoster(client xmpp.Sender, g *gocui.Gui, config *config) {
 			for _, item := range rosterItems.Items {
 				viewState.contacts = append(viewState.contacts, item.Jid)
 			}
+			// Put a "go back" button at the end of the list
 			viewState.contacts = append(viewState.contacts, backFromContacts)
 			fmt.Fprintln(chlw, infoFormat+"Contacts list updated !")
 			return

client.go

@@ -154,7 +154,8 @@ func NewClient(config Config, r *Router, errorHandler func(error)) (c *Client, e
 	if config.TransportConfiguration.Domain == "" {
 		config.TransportConfiguration.Domain = config.parsedJid.Domain
 	}
-	c.transport = NewClientTransport(config.TransportConfiguration)
+	c.config.TransportConfiguration.ConnectTimeout = c.config.ConnectTimeout
+	c.transport = NewClientTransport(c.config.TransportConfiguration)
 
 	if config.StreamLogger != nil {
 		c.transport.LogTraffic(config.StreamLogger)
@@ -183,7 +184,24 @@ func (c *Client) Resume(state SMState) error {
 
 	// Client is ok, we now open XMPP session
 	if c.Session, err = NewSession(c.transport, c.config, state); err != nil {
-		c.transport.Close()
+		// Try to get the stream close tag from the server.
+		go func() {
+			for {
+				val, err := stanza.NextPacket(c.transport.GetDecoder())
+				if err != nil {
+					c.ErrorHandler(err)
+					c.disconnected(state)
+					return
+				}
+				switch val.(type) {
+				case stanza.StreamClosePacket:
+					// TCP messages should arrive in order, so we can expect to get nothing more after this occurs
+					c.transport.ReceivedStreamClose()
+					return
+				}
+			}
+		}()
+		c.Disconnect()
 		return err
 	}
 	c.Session.StreamId = streamId
@@ -205,15 +223,12 @@ func (c *Client) Resume(state SMState) error {
 	return err
 }
 
-func (c *Client) Disconnect() {
+func (c *Client) Disconnect() error {
-	// TODO : Wait for server response for clean disconnect
-	presence := stanza.NewPresence(stanza.Attrs{From: c.config.Jid})
-	presence.Type = stanza.PresenceTypeUnavailable
-	c.Send(presence)
-	c.SendRaw(stanza.StreamClose)
 	if c.transport != nil {
-		_ = c.transport.Close()
+		return c.transport.Close()
 	}
+	// No transport so no connection.
+	return nil
 }
 
 func (c *Client) SetHandler(handler EventHandler) {
@@ -294,7 +309,8 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
 			close(keepaliveQuit)
 			c.streamError(packet.Error.Local, packet.Text)
 			c.ErrorHandler(errors.New("stream error: " + packet.Error.Local))
-			return
+			// We don't return here, because we want to wait for the stream close tag from the server, or timeout.
+			c.Disconnect()
 		// Process Stream management nonzas
 		case stanza.SMRequest:
 			answer := stanza.SMAnswer{XMLName: xml.Name{
@@ -306,6 +322,10 @@ func (c *Client) recv(state SMState, keepaliveQuit chan<- struct{}) {
 				c.ErrorHandler(err)
 				return
 			}
+		case stanza.StreamClosePacket:
+			// TCP messages should arrive in order, so we can expect to get nothing more after this occurs
+			c.transport.ReceivedStreamClose()
+			return
 		default:
 			state.Inbound++
 		}

client_test.go

@@ -67,7 +67,10 @@ func TestClient_Connect(t *testing.T) {
 func TestClient_NoInsecure(t *testing.T) {
 	// Setup Mock server
 	mock := ServerMock{}
-	mock.Start(t, testXMPPAddress, handlerAbortTLS)
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		handlerAbortTLS(t, sc)
+		closeConn(t, sc)
+	})
 
 	// Test / Check result
 	config := Config{
@@ -97,7 +100,10 @@ func TestClient_NoInsecure(t *testing.T) {
 func TestClient_FeaturesTracking(t *testing.T) {
 	// Setup Mock server
 	mock := ServerMock{}
-	mock.Start(t, testXMPPAddress, handlerAbortTLS)
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		handlerAbortTLS(t, sc)
+		closeConn(t, sc)
+	})
 
 	// Test / Check result
 	config := Config{
@@ -247,6 +253,7 @@ func TestClient_SendRaw(t *testing.T) {
 		handlerClientConnectSuccess(t, sc)
 		discardPresence(t, sc)
 		respondToIQ(t, sc)
+		closeConn(t, sc)
 		done <- struct{}{}
 	}
 	type testCase struct {
@@ -290,6 +297,7 @@ func TestClient_SendRaw(t *testing.T) {
 			select {
 			// We don't use the default "long" timeout here because waiting it out means passing the test.
 			case <-time.After(100 * time.Millisecond):
+				c.Disconnect()
 			case err = <-errChan:
 				if err == nil && tcase.shouldErr {
 					t.Errorf("Failed to get closing stream err")
@@ -297,7 +305,6 @@ func TestClient_SendRaw(t *testing.T) {
 					t.Errorf("This test is not supposed to err !")
 				}
 			}
-			c.transport.Close()
 			select {
 			case <-done:
 				m.Stop()
@@ -309,7 +316,10 @@ func TestClient_SendRaw(t *testing.T) {
 }
 
 func TestClient_Disconnect(t *testing.T) {
-	c, m := mockClientConnection(t, handlerClientConnectSuccess, testClientBasePort)
+	c, m := mockClientConnection(t, func(t *testing.T, sc *ServerConn) {
+		handlerClientConnectSuccess(t, sc)
+		closeConn(t, sc)
+	}, testClientBasePort)
 	err := c.transport.Ping()
 	if err != nil {
 		t.Errorf("Could not ping but not disconnected yet")
@@ -326,7 +336,10 @@ func TestClient_DisconnectStreamManager(t *testing.T) {
 	// Init mock server
 	// Setup Mock server
 	mock := ServerMock{}
-	mock.Start(t, testXMPPAddress, handlerAbortTLS)
+	mock.Start(t, testXMPPAddress, func(t *testing.T, sc *ServerConn) {
+		handlerAbortTLS(t, sc)
+		closeConn(t, sc)
+	})
 
 	// Test / Check result
 	config := Config{
@@ -375,6 +388,23 @@ func handlerClientConnectSuccess(t *testing.T, sc *ServerConn) {
 	bind(t, sc)
 }
 
+// closeConn closes the connection on request from the client
+func closeConn(t *testing.T, sc *ServerConn) {
+	for {
+		cls, err := stanza.NextPacket(sc.decoder)
+		if err != nil {
+			t.Errorf("cannot read from socket: %s", err)
+			return
+		}
+		switch cls.(type) {
+		case stanza.StreamClosePacket:
+			fmt.Fprintf(sc.connection, stanza.StreamClose)
+			return
+		}
+	}
+
+}
+
 // We expect client will abort on TLS
 func handlerAbortTLS(t *testing.T, sc *ServerConn) {
 	checkClientOpenStream(t, sc)

component.go

@@ -113,11 +113,13 @@ func (c *Component) Resume(sm SMState) error {
 	}
 }
 
-func (c *Component) Disconnect() {
+func (c *Component) Disconnect() error {
 	// TODO: Add a way to wait for stream close acknowledgement from the server for clean disconnect
 	if c.transport != nil {
-		_ = c.transport.Close()
+		return c.transport.Close()
 	}
+	// No transport so no connection.
+	return nil
 }
 
 func (c *Component) SetHandler(handler EventHandler) {
@@ -126,7 +128,6 @@ func (c *Component) SetHandler(handler EventHandler) {
 
 // Receiver Go routine receiver
 func (c *Component) recv() {
-
 	for {
 		val, err := stanza.NextPacket(c.transport.GetDecoder())
 		if err != nil {
@@ -140,6 +141,11 @@ func (c *Component) recv() {
 			c.router.route(c, val)
 			c.streamError(p.Error.Local, p.Text)
 			c.ErrorHandler(errors.New("stream error: " + p.Error.Local))
+			// We don't return here, because we want to wait for the stream close tag from the server, or timeout.
+			c.Disconnect()
+		case stanza.StreamClosePacket:
+			// TCP messages should arrive in order, so we can expect to get nothing more after this occurs
+			c.transport.ReceivedStreamClose()
 			return
 		}
 		c.router.route(c, val)

stanza/parser.go

@@ -50,11 +50,20 @@ func InitStream(p *xml.Decoder) (sessionID string, err error) {
 // TODO make auth and bind use NextPacket instead of directly NextStart
 func NextPacket(p *xml.Decoder) (Packet, error) {
 	// Read start element to find out how we want to parse the XMPP packet
-	se, err := NextStart(p)
+	t, err := NextXmppToken(p)
 	if err != nil {
 		return nil, err
 	}
 
+	if ee, ok := t.(xml.EndElement); ok {
+		return decodeStream(p, ee)
+	}
+
+	// If not an end element, then must be a start
+	se, ok := t.(xml.StartElement)
+	if !ok {
+		return nil, errors.New("unknown token ")
+	}
 	// Decode one of the top level XMPP namespace
 	switch se.Name.Space {
 	case NSStream:
@@ -73,7 +82,29 @@ func NextPacket(p *xml.Decoder) (Packet, error) {
 	}
 }
 
-// Scan XML token stream to find next StartElement.
+// NextXmppToken scans XML token stream to find next StartElement or stream EndElement.
+// We need the EndElement scan, because we must register stream close tags
+func NextXmppToken(p *xml.Decoder) (xml.Token, error) {
+	for {
+		t, err := p.Token()
+		if err == io.EOF {
+			return xml.StartElement{}, errors.New("connection closed")
+		}
+		if err != nil {
+			return xml.StartElement{}, fmt.Errorf("NextStart %s", err)
+		}
+		switch t := t.(type) {
+		case xml.StartElement:
+			return t, nil
+		case xml.EndElement:
+			if t.Name.Space == NSStream && t.Name.Local == "stream" {
+				return t, nil
+			}
+		}
+	}
+}
+
+// NextStart scans XML token stream to find next StartElement.
 func NextStart(p *xml.Decoder) (xml.StartElement, error) {
 	for {
 		t, err := p.Token()
@@ -97,7 +128,8 @@ TODO: From all the decoder, we can return a pointer to the actual concrete type,
 */
 
 // decodeStream will fully decode a stream packet
-func decodeStream(p *xml.Decoder, se xml.StartElement) (Packet, error) {
+func decodeStream(p *xml.Decoder, t xml.Token) (Packet, error) {
+	if se, ok := t.(xml.StartElement); ok {
 		switch se.Name.Local {
 		case "error":
 			return streamError.decode(p, se)
@@ -107,6 +139,18 @@ func decodeStream(p *xml.Decoder, se xml.StartElement) (Packet, error) {
 			return nil, errors.New("unexpected XMPP packet " +
 				se.Name.Space + " <" + se.Name.Local + "/>")
 		}
+	}
+
+	if ee, ok := t.(xml.EndElement); ok {
+		if ee.Name.Local == "stream" {
+			return streamClose.decode(ee), nil
+		}
+		return nil, errors.New("unexpected XMPP packet " +
+			ee.Name.Space + " <" + ee.Name.Local + "/>")
+	}
+
+	// Should not happen
+	return nil, errors.New("unexpected XML token ")
 }
 
 // decodeSASL decodes a packet related to SASL authentication.

stanza/stream_features.go

@@ -165,3 +165,21 @@ func (streamErrorDecoder) decode(p *xml.Decoder, se xml.StartElement) (StreamErr
 	err := p.DecodeElement(&packet, &se)
 	return packet, err
 }
+
+// ============================================================================
+// StreamClose "Packet"
+
+// This is just a closing tag and hold no information
+type StreamClosePacket struct{}
+
+func (StreamClosePacket) Name() string {
+	return "stream:stream"
+}
+
+type streamCloseDecoder struct{}
+
+var streamClose streamCloseDecoder
+
+func (streamCloseDecoder) decode(_ xml.EndElement) StreamClosePacket {
+	return StreamClosePacket{}
+}

stream_manager.go

@@ -29,7 +29,7 @@ type StreamClient interface {
 	Send(packet stanza.Packet) error
 	SendIQ(ctx context.Context, iq stanza.IQ) (chan stanza.IQ, error)
 	SendRaw(packet string) error
-	Disconnect()
+	Disconnect() error
 	SetHandler(handler EventHandler)
 }
 

transport.go

@@ -40,6 +40,9 @@ type Transport interface {
 	Read(p []byte) (n int, err error)
 	Write(p []byte) (n int, err error)
 	Close() error
+	// ReceivedStreamClose signals to the transport that a </stream:stream> has been received and that the tcp connection
+	// should be closed.
+	ReceivedStreamClose()
 }
 
 // NewClientTransport creates a new Transport instance for clients.

websocket_transport.go

@@ -18,7 +18,7 @@ const maxPacketSize = 32768
 
 const pingTimeout = time.Duration(5) * time.Second
 
-var ServerDoesNotSupportXmppOverWebsocket = errors.New("The websocket server does not support the xmpp subprotocol")
+var ServerDoesNotSupportXmppOverWebsocket = errors.New("the websocket server does not support the xmpp subprotocol")
 
 // The decoder is expected to be initialized after connecting to a server.
 type WebsocketTransport struct {
@@ -47,6 +47,7 @@ func (t *WebsocketTransport) Connect() (string, error) {
 	wsConn, response, err := websocket.Dial(ctx, t.Config.Address, &websocket.DialOptions{
 		Subprotocols: []string{"xmpp"},
 	})
+
 	if err != nil {
 		return "", NewConnError(err, true)
 	}
@@ -177,3 +178,8 @@ func (t *WebsocketTransport) cleanup(code websocket.StatusCode) error {
 	}
 	return err
 }
+
+// ReceivedStreamClose is not used for websockets for now
+func (t *WebsocketTransport) ReceivedStreamClose() {
+	return
+}

xmpp_transport.go

@@ -24,6 +24,7 @@ type XMPPTransport struct {
 	readWriter    io.ReadWriter
 	logFile       io.Writer
 	isSecure      bool
+	closeChan     chan stanza.StreamClosePacket
 }
 
 var componentStreamOpen = fmt.Sprintf("<?xml version='1.0'?><stream:stream to='%%s' xmlns='%s' xmlns:stream='%s'>", stanza.NSComponent, stanza.NSStream)
@@ -38,13 +39,14 @@ func (t *XMPPTransport) Connect() (string, error) {
 		return "", NewConnError(err, true)
 	}
 
+	t.closeChan = make(chan stanza.StreamClosePacket)
 	t.readWriter = newStreamLogger(t.conn, t.logFile)
 	t.decoder = xml.NewDecoder(bufio.NewReaderSize(t.readWriter, maxPacketSize))
 	t.decoder.CharsetReader = t.Config.CharsetReader
 	return t.StartStream()
 }
 
-func (t XMPPTransport) StartStream() (string, error) {
+func (t *XMPPTransport) StartStream() (string, error) {
 	if _, err := fmt.Fprintf(t, t.openStatement, t.Config.Domain); err != nil {
 		t.Close()
 		return "", NewConnError(err, true)
@@ -58,19 +60,19 @@ func (t XMPPTransport) StartStream() (string, error) {
 	return sessionID, nil
 }
 
-func (t XMPPTransport) DoesStartTLS() bool {
+func (t *XMPPTransport) DoesStartTLS() bool {
 	return true
 }
 
-func (t XMPPTransport) GetDomain() string {
+func (t *XMPPTransport) GetDomain() string {
 	return t.Config.Domain
 }
 
-func (t XMPPTransport) GetDecoder() *xml.Decoder {
+func (t *XMPPTransport) GetDecoder() *xml.Decoder {
 	return t.decoder
 }
 
-func (t XMPPTransport) IsSecure() bool {
+func (t *XMPPTransport) IsSecure() bool {
 	return t.isSecure
 }
 
@@ -105,7 +107,7 @@ func (t *XMPPTransport) StartTLS() error {
 	return nil
 }
 
-func (t XMPPTransport) Ping() error {
+func (t *XMPPTransport) Ping() error {
 	n, err := t.conn.Write([]byte("\n"))
 	if err != nil {
 		return err
@@ -116,24 +118,31 @@ func (t XMPPTransport) Ping() error {
 	return nil
 }
 
-func (t XMPPTransport) Read(p []byte) (n int, err error) {
+func (t *XMPPTransport) Read(p []byte) (n int, err error) {
 	if t.readWriter == nil {
 		return 0, errors.New("cannot read: not connected, no readwriter")
 	}
 	return t.readWriter.Read(p)
 }
 
-func (t XMPPTransport) Write(p []byte) (n int, err error) {
+func (t *XMPPTransport) Write(p []byte) (n int, err error) {
 	if t.readWriter == nil {
 		return 0, errors.New("cannot write: not connected, no readwriter")
 	}
 	return t.readWriter.Write(p)
 }
 
-func (t XMPPTransport) Close() error {
+func (t *XMPPTransport) Close() error {
 	if t.readWriter != nil {
-		_, _ = t.readWriter.Write([]byte("</stream:stream>"))
+		_, _ = t.readWriter.Write([]byte(stanza.StreamClose))
 	}
+
+	// Try to wait for the stream close tag from the server. After a timeout, disconnect anyway.
+	select {
+	case <-t.closeChan:
+	case <-time.After(time.Duration(t.Config.ConnectTimeout) * time.Second):
+	}
+
 	if t.conn != nil {
 		return t.conn.Close()
 	}
@@ -143,3 +152,7 @@ func (t XMPPTransport) Close() error {
 func (t *XMPPTransport) LogTraffic(logFile io.Writer) {
 	t.logFile = logFile
 }
+
+func (t *XMPPTransport) ReceivedStreamClose() {
+	t.closeChan <- stanza.StreamClosePacket{}
+}