Added Session + Handlers

session/handler.go

@@ -0,0 +1,43 @@
+package session
+
+import (
+	"errors"
+	"reflect"
+)
+
+type handler struct {
+	event    reflect.Type
+	callback reflect.Value
+}
+
+func reflectFn(function interface{}) (*handler, error) {
+	fnV := reflect.ValueOf(function)
+	fnT := fnV.Type()
+
+	if fnT.Kind() != reflect.Func {
+		return nil, errors.New("given interface is not a function")
+	}
+
+	if fnT.NumIn() != 1 {
+		return nil, errors.New("function can only accept 1 event as argument")
+	}
+
+	argT := fnT.In(0)
+
+	if argT.Kind() != reflect.Ptr {
+		return nil, errors.New("first argument is not pointer")
+	}
+
+	return &handler{
+		event:    argT,
+		callback: fnV,
+	}, nil
+}
+
+func (h handler) not(event reflect.Type) bool {
+	return h.event != event
+}
+
+func (h handler) call(event reflect.Value) {
+	h.callback.Call([]reflect.Value{event})
+}

session/handler_test.go

@@ -0,0 +1,59 @@
+package session
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/diamondburned/arikawa/gateway"
+)
+
+func TestReflect(t *testing.T) {
+	var results = make(chan string)
+
+	h, err := reflectFn(func(m *gateway.MessageCreateEvent) {
+		results <- m.Content
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	const result = "Hime Arikawa"
+	var msg = &gateway.MessageCreateEvent{
+		Content: result,
+	}
+
+	var msgV = reflect.ValueOf(msg)
+	var msgT = msgV.Type()
+
+	if h.not(msgT) {
+		t.Fatal("Event type mismatch")
+	}
+
+	go h.call(msgV)
+
+	if results := <-results; results != result {
+		t.Fatal("Unexpected results:", results)
+	}
+}
+
+func BenchmarkReflect(b *testing.B) {
+	h, err := reflectFn(func(m *gateway.MessageCreateEvent) {})
+	if err != nil {
+		b.Fatal(err)
+	}
+
+	var msg = &gateway.MessageCreateEvent{}
+
+	b.ResetTimer()
+
+	for n := 0; n < b.N; n++ {
+		var msgV = reflect.ValueOf(msg)
+		var msgT = msgV.Type()
+
+		if h.not(msgT) {
+			b.Fatal("Event type mismatch")
+		}
+
+		h.call(msgV)
+	}
+}

session/session.go

@@ -1,13 +1,14 @@
 package session
 
 import (
+	"fmt"
 	"log"
+	"reflect"
 	"sync"
-	"time"
 
 	"github.com/diamondburned/arikawa/api"
 	"github.com/diamondburned/arikawa/gateway"
-	"github.com/diamondburned/arikawa/internal/json"
+	"github.com/pkg/errors"
 )
 
 /*
@@ -28,56 +29,153 @@ import (
 */
 
 type Session struct {
-	API         *api.Client
-	Gateway     *gateway.Conn
-	gatewayOnce sync.Once
+	*api.Client
+	gateway *gateway.Gateway
 
 	ErrorLog func(err error) // default to log.Println
 
-	// Heartrate is the received duration between heartbeats.
-	Heartrate time.Duration
+	// Synchronous controls whether to spawn each event handler in its own
+	// goroutine. Default false (meaning goroutines are spawned).
+	Synchronous bool
 
-	// LastBeat logs the received heartbeats, with the newest one
-	// first.
-	LastBeat [2]time.Time
-
-	// Used for Close()
-	stoppers []chan<- struct{}
-	closers  []func() error
+	// handlers stuff
+	handlers map[uint64]handler
+	hserial  uint64
+	hmutex   sync.Mutex
+	hstop    chan<- struct{}
 }
 
 func New(token string) (*Session, error) {
 	// Initialize the session and the API interface
 	s := &Session{}
-	s.API = api.NewClient(token)
+	s.Client = api.NewClient(token)
 
 	// Default logger
 	s.ErrorLog = func(err error) {
 		log.Println("Arikawa/session error:", err)
 	}
 
-	// Connect to the Gateway
-	c, err := gateway.NewConn(json.Default{})
+	// Open a gateway
+	g, err := gateway.NewGateway(token)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "Failed to connect to Gateway")
 	}
-	s.Gateway = c
+	s.gateway = g
 
 	return s, nil
 }
 
-func (s *Session) Close() error {
-	for _, stop := range s.stoppers {
-		close(stop)
+func NewWithGateway(gw *gateway.Gateway) *Session {
+	return &Session{
+		// Nab off gateway's token
+		Client: api.NewClient(gw.Identifier.Token),
+		ErrorLog: func(err error) {
+			log.Println("Arikawa/session error:", err)
+		},
+		handlers: map[uint64]handler{},
+	}
+}
+
+func (s *Session) Open() error {
+	if err := s.gateway.Start(); err != nil {
+		return errors.Wrap(err, "Failed to start gateway")
 	}
 
-	var err error
+	stop := make(chan struct{})
+	s.hstop = stop
+	go s.startHandler(stop)
 
-	for _, closer := range s.closers {
-		if cerr := closer(); cerr != nil {
-			err = cerr
+	return nil
+}
+
+func (s *Session) AddHandler(handler interface{}) (rm func()) {
+	rm, err := s.addHandler(handler)
+	if err != nil {
+		panic(err)
+	}
+	return rm
+}
+
+// AddHandlerCheck adds the handler, but safe-guards reflect panics with a
+// recoverer, returning the error.
+func (s *Session) AddHandlerCheck(handler interface{}) (rm func(), err error) {
+	// Reflect would actually panic if anything goes wrong, so this is just in
+	// case.
+	defer func() {
+		if rec := recover(); rec != nil {
+			if recErr, ok := rec.(error); ok {
+				err = recErr
+			} else {
+				err = fmt.Errorf("%v", rec)
+			}
+		}
+	}()
+
+	return s.addHandler(handler)
+}
+
+func (s *Session) addHandler(handler interface{}) (rm func(), err error) {
+	// Reflect the handler
+	h, err := reflectFn(handler)
+	if err != nil {
+		return nil, errors.Wrap(err, "Handler reflect failed")
+	}
+
+	s.hmutex.Lock()
+	defer s.hmutex.Unlock()
+
+	// Get the current counter value and increment the counter
+	serial := s.hserial
+	s.hserial++
+
+	// Use the serial for the map
+	s.handlers[serial] = *h
+
+	return func() {
+		s.hmutex.Lock()
+		defer s.hmutex.Unlock()
+
+		delete(s.handlers, serial)
+	}, nil
+}
+
+func (s *Session) startHandler(stop <-chan struct{}) {
+	for {
+		select {
+		case <-stop:
+			return
+		case ev := <-s.gateway.Events:
+			s.call(ev)
 		}
 	}
-
-	return err
+}
+
+func (s *Session) call(ev interface{}) {
+	var evV = reflect.ValueOf(ev)
+	var evT = evV.Type()
+
+	s.hmutex.Lock()
+	defer s.hmutex.Unlock()
+
+	for _, handler := range s.handlers {
+		if handler.not(evT) {
+			continue
+		}
+
+		if s.Synchronous {
+			handler.call(evV)
+		} else {
+			go handler.call(evV)
+		}
+	}
+}
+
+func (s *Session) Close() error {
+	// Stop the event handler
+	if s.hstop != nil {
+		close(s.hstop)
+	}
+
+	// Close the websocket
+	return s.gateway.Close()
 }

session/session_test.go

@@ -0,0 +1,55 @@
+package session
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/diamondburned/arikawa/gateway"
+)
+
+func TestSessionCall(t *testing.T) {
+	var results = make(chan string)
+
+	s := &Session{
+		handlers: map[uint64]handler{},
+	}
+
+	// Add handler test
+	rm := s.AddHandler(func(m *gateway.MessageCreateEvent) {
+		results <- m.Content
+	})
+
+	go s.call(&gateway.MessageCreateEvent{
+		Content: "test",
+	})
+
+	if r := <-results; r != "test" {
+		t.Fatal("Returned results is wrong:", r)
+	}
+
+	// Remove handler test
+	rm()
+
+	go s.call(&gateway.MessageCreateEvent{
+		Content: "test",
+	})
+
+	select {
+	case <-results:
+		t.Fatal("Unexpected results")
+	case <-time.After(time.Millisecond):
+		break
+	}
+
+	// Invalid type test
+	rm, err := s.AddHandlerCheck("this should panic")
+	if err == nil {
+		t.Fatal("No errors found")
+	}
+	defer rm()
+
+	if !strings.Contains(err.Error(), "given interface is not a function") {
+		t.Fatal("Unexpected error:", err)
+	}
+}