Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/platform/services/remotecluster/ping_test.go

@@ -0,0 +1,142 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package remotecluster
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"sync/atomic"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/wiggin77/merror"
+
+	"github.com/mattermost/mattermost-server/v6/model"
+)
+
+const (
+	Recent = 60000
+)
+
+func TestPing(t *testing.T) {
+	disablePing = false
+
+	t.Run("No error", func(t *testing.T) {
+		var countWebReq int32
+		merr := merror.New()
+
+		wg := &sync.WaitGroup{}
+		wg.Add(NumRemotes)
+
+		ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			defer wg.Done()
+			defer w.WriteHeader(200)
+			atomic.AddInt32(&countWebReq, 1)
+
+			var frame model.RemoteClusterFrame
+			err := json.NewDecoder(r.Body).Decode(&frame)
+			if err != nil {
+				merr.Append(err)
+				return
+			}
+			if len(frame.Msg.Payload) == 0 {
+				merr.Append(fmt.Errorf("Payload should not be empty; remote_id=%s", frame.RemoteId))
+				return
+			}
+
+			var ping model.RemoteClusterPing
+			err = json.Unmarshal(frame.Msg.Payload, &ping)
+			if err != nil {
+				merr.Append(err)
+				return
+			}
+			if !checkRecent(ping.SentAt, Recent) {
+				merr.Append(fmt.Errorf("timestamp out of range, got %d", ping.SentAt))
+				return
+			}
+			if ping.RecvAt != 0 {
+				merr.Append(fmt.Errorf("timestamp should be 0, got %d", ping.RecvAt))
+				return
+			}
+		}))
+		defer ts.Close()
+
+		mockServer := newMockServer(makeRemoteClusters(NumRemotes, ts.URL))
+		defer mockServer.Shutdown()
+
+		service, err := NewRemoteClusterService(mockServer)
+		require.NoError(t, err)
+
+		err = service.Start()
+		require.NoError(t, err)
+		defer service.Shutdown()
+
+		wg.Wait()
+
+		assert.NoError(t, merr.ErrorOrNil())
+
+		assert.Equal(t, int32(NumRemotes), atomic.LoadInt32(&countWebReq))
+		t.Logf("%d web requests counted;  %d expected",
+			atomic.LoadInt32(&countWebReq), NumRemotes)
+	})
+
+	t.Run("HTTP errors", func(t *testing.T) {
+		var countWebReq int32
+		merr := merror.New()
+
+		wg := &sync.WaitGroup{}
+		wg.Add(NumRemotes)
+
+		ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			defer wg.Done()
+			atomic.AddInt32(&countWebReq, 1)
+
+			var frame model.RemoteClusterFrame
+			err := json.NewDecoder(r.Body).Decode(&frame)
+			if err != nil {
+				merr.Append(err)
+			}
+			var ping model.RemoteClusterPing
+			err = json.Unmarshal(frame.Msg.Payload, &ping)
+			if err != nil {
+				merr.Append(err)
+			}
+			if !checkRecent(ping.SentAt, Recent) {
+				merr.Append(fmt.Errorf("timestamp out of range, got %d", ping.SentAt))
+			}
+			if ping.RecvAt != 0 {
+				merr.Append(fmt.Errorf("timestamp should be 0, got %d", ping.RecvAt))
+			}
+			w.WriteHeader(500)
+		}))
+		defer ts.Close()
+
+		mockServer := newMockServer(makeRemoteClusters(NumRemotes, ts.URL))
+		defer mockServer.Shutdown()
+
+		service, err := NewRemoteClusterService(mockServer)
+		require.NoError(t, err)
+
+		err = service.Start()
+		require.NoError(t, err)
+		defer service.Shutdown()
+
+		wg.Wait()
+
+		assert.NoError(t, merr.ErrorOrNil())
+
+		assert.Equal(t, int32(NumRemotes), atomic.LoadInt32(&countWebReq))
+		t.Logf("%d web requests counted;  %d expected",
+			atomic.LoadInt32(&countWebReq), NumRemotes)
+	})
+}
+
+func checkRecent(millis int64, within int64) bool {
+	now := model.GetMillis()
+	return millis > now-within && millis < now+within
+}