Add EventSource support (#11235)

If the browser supports EventSource switch to use this instead of
polling notifications.

Signed-off-by: Andrew Thornton art27@cantab.net

integrations/eventsource_test.go

@@ -0,0 +1,78 @@
+// Copyright 2020 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package integrations
+
+import (
+	"fmt"
+	"net/http"
+	"testing"
+	"time"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/eventsource"
+	api "code.gitea.io/gitea/modules/structs"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestEventSourceManagerRun(t *testing.T) {
+	defer prepareTestEnv(t)()
+	manager := eventsource.GetManager()
+
+	eventChan := manager.Register(2)
+	defer func() {
+		manager.Unregister(2, eventChan)
+		// ensure the eventChan is closed
+		for {
+			_, ok := <-eventChan
+			if !ok {
+				break
+			}
+		}
+	}()
+	expectNotificationCountEvent := func(count int64) func() bool {
+		return func() bool {
+			select {
+			case event, ok := <-eventChan:
+				if !ok {
+					return false
+				}
+				data, ok := event.Data.(models.UserIDCount)
+				if !ok {
+					return false
+				}
+				return event.Name == "notification-count" && data.Count == count
+			default:
+				return false
+			}
+		}
+	}
+
+	user2 := models.AssertExistsAndLoadBean(t, &models.User{ID: 2}).(*models.User)
+	repo1 := models.AssertExistsAndLoadBean(t, &models.Repository{ID: 1}).(*models.Repository)
+	thread5 := models.AssertExistsAndLoadBean(t, &models.Notification{ID: 5}).(*models.Notification)
+	assert.NoError(t, thread5.LoadAttributes())
+	session := loginUser(t, user2.Name)
+	token := getTokenForLoggedInUser(t, session)
+
+	var apiNL []api.NotificationThread
+
+	// -- mark notifications as read --
+	req := NewRequest(t, "GET", fmt.Sprintf("/api/v1/notifications?token=%s", token))
+	resp := session.MakeRequest(t, req, http.StatusOK)
+
+	DecodeJSON(t, resp, &apiNL)
+	assert.Len(t, apiNL, 2)
+
+	lastReadAt := "2000-01-01T00%3A50%3A01%2B00%3A00" //946687801 <- only Notification 4 is in this filter ...
+	req = NewRequest(t, "PUT", fmt.Sprintf("/api/v1/repos/%s/%s/notifications?last_read_at=%s&token=%s", user2.Name, repo1.Name, lastReadAt, token))
+	resp = session.MakeRequest(t, req, http.StatusResetContent)
+
+	req = NewRequest(t, "GET", fmt.Sprintf("/api/v1/notifications?token=%s", token))
+	resp = session.MakeRequest(t, req, http.StatusOK)
+	DecodeJSON(t, resp, &apiNL)
+	assert.Len(t, apiNL, 1)
+
+	assert.Eventually(t, expectNotificationCountEvent(1), 30*time.Second, 1*time.Second)
+}