Add router to make it easier to set up routing info

- Using the router, the dispatch is not done anymore by receiving from
  receive channel, but by registering callback functions in routers,
  with matchers.
- Make IQPayload a real interface to make it easier to match namespaces.
- The StreamManager Run command is now blocking, waiting for StreamManager
  to terminate.

router_test.go

@@ -0,0 +1,75 @@
+package xmpp_test
+
+import (
+	"bytes"
+	"encoding/xml"
+	"io"
+	"testing"
+
+	"gosrc.io/xmpp"
+)
+
+var successFlag = []byte("matched")
+
+func TestNameMatcher(t *testing.T) {
+	router := xmpp.NewRouter()
+	router.HandleFunc("message", func(w io.Writer, p xmpp.Packet) {
+		_, _ = w.Write(successFlag)
+	})
+
+	// Check that a message packet is properly matched
+	var buf bytes.Buffer
+	// TODO: We want packet creation code to use struct to use default values
+	msg := xmpp.NewMessage("chat", "", "test@localhost", "1", "")
+	msg.Body = "Hello"
+	router.Route(&buf, msg)
+	if !bytes.Equal(buf.Bytes(), successFlag) {
+		t.Error("Message was not matched and routed properly")
+	}
+
+	// Check that an IQ packet is not matched
+	buf = bytes.Buffer{}
+	iq := xmpp.NewIQ("get", "", "localhost", "1", "")
+	iq.Payload = append(iq.Payload, &xmpp.DiscoInfo{})
+	router.Route(&buf, iq)
+	if bytes.Equal(buf.Bytes(), successFlag) {
+		t.Error("IQ should not have been matched and routed")
+	}
+}
+
+func TestIQNSMatcher(t *testing.T) {
+	router := xmpp.NewRouter()
+	router.NewRoute().
+		IQNamespaces(xmpp.NSDiscoInfo, xmpp.NSDiscoItems).
+		HandlerFunc(func(w io.Writer, p xmpp.Packet) {
+			_, _ = w.Write(successFlag)
+		})
+
+	// Check that an IQ with proper namespace does match
+	var buf bytes.Buffer
+	iqDisco := xmpp.NewIQ("get", "", "localhost", "1", "")
+	// TODO: Add a function to generate payload with proper namespace initialisation
+	iqDisco.Payload = append(iqDisco.Payload, &xmpp.DiscoInfo{
+		XMLName: xml.Name{
+			Space: xmpp.NSDiscoInfo,
+			Local: "query",
+		}})
+	router.Route(&buf, iqDisco)
+	if !bytes.Equal(buf.Bytes(), successFlag) {
+		t.Errorf("IQ should have been matched and routed: %v", iqDisco)
+	}
+
+	// Check that another namespace is not matched
+	buf = bytes.Buffer{}
+	iqVersion := xmpp.NewIQ("get", "", "localhost", "1", "")
+	// TODO: Add a function to generate payload with proper namespace initialisation
+	iqVersion.Payload = append(iqVersion.Payload, &xmpp.DiscoInfo{
+		XMLName: xml.Name{
+			Space: "jabber:iq:version",
+			Local: "query",
+		}})
+	router.Route(&buf, iqVersion)
+	if bytes.Equal(buf.Bytes(), successFlag) {
+		t.Errorf("IQ should not have been matched and routed: %v", iqVersion)
+	}
+}