[MM-46694] A/B Test: welcome post (#20926)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

store/opentracinglayer/opentracinglayer.go

@@ -10801,6 +10801,24 @@ func (s *OpenTracingLayerUserStore) GetEtagForProfilesNotInTeam(teamID string) s
 	return result
 }
 
+func (s *OpenTracingLayerUserStore) GetFirstSystemAdminID() (string, error) {
+	origCtx := s.Root.Store.Context()
+	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.GetFirstSystemAdminID")
+	s.Root.Store.SetContext(newCtx)
+	defer func() {
+		s.Root.Store.SetContext(origCtx)
+	}()
+
+	defer span.Finish()
+	result, err := s.UserStore.GetFirstSystemAdminID()
+	if err != nil {
+		span.LogFields(spanlog.Error(err))
+		ext.Error.Set(span, true)
+	}
+
+	return result, err
+}
+
 func (s *OpenTracingLayerUserStore) GetForLogin(loginID string, allowSignInWithUsername bool, allowSignInWithEmail bool) (*model.User, error) {
 	origCtx := s.Root.Store.Context()
 	span, newCtx := tracing.StartSpanWithParentByContext(s.Root.Store.Context(), "UserStore.GetForLogin")

store/retrylayer/retrylayer.go

@@ -12324,6 +12324,27 @@ func (s *RetryLayerUserStore) GetEtagForProfilesNotInTeam(teamID string) string
 
 }
 
+func (s *RetryLayerUserStore) GetFirstSystemAdminID() (string, error) {
+
+	tries := 0
+	for {
+		result, err := s.UserStore.GetFirstSystemAdminID()
+		if err == nil {
+			return result, nil
+		}
+		if !isRepeatableError(err) {
+			return result, err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return result, err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerUserStore) GetForLogin(loginID string, allowSignInWithUsername bool, allowSignInWithEmail bool) (*model.User, error) {
 
 	tries := 0

store/sqlstore/user_store.go

@@ -1748,6 +1748,16 @@ func (us SqlUserStore) InferSystemInstallDate() (int64, error) {
 	return createAt, nil
 }
 
+func (us SqlUserStore) GetFirstSystemAdminID() (string, error) {
+	var id string
+	err := us.GetReplicaX().Get(&id, "SELECT Id FROM Users WHERE Roles LIKE ? ORDER BY CreateAt ASC LIMIT 1", "%system_admin%")
+	if err != nil {
+		return "", errors.Wrap(err, "failed to get first system admin")
+	}
+
+	return id, nil
+}
+
 func (us SqlUserStore) GetUsersBatchForIndexing(startTime int64, startFileID string, limit int) ([]*model.UserForIndexing, error) {
 	users := []*model.User{}
 	usersQuery, args, err := us.usersQuery.

store/store.go

@@ -481,6 +481,7 @@ type UserStore interface {
 	IsEmpty(excludeBots bool) (bool, error)
 	GetUsersWithInvalidEmails(page int, perPage int, restrictedDomains string) ([]*model.User, error)
 	InsertUsers(users []*model.User) error
+	GetFirstSystemAdminID() (string, error)
 }
 
 type BotStore interface {

store/storetest/mocks/UserStore.go

@@ -569,6 +569,27 @@ func (_m *UserStore) GetEtagForProfilesNotInTeam(teamID string) string {
 	return r0
 }
 
+// GetFirstSystemAdminID provides a mock function with given fields:
+func (_m *UserStore) GetFirstSystemAdminID() (string, error) {
+	ret := _m.Called()
+
+	var r0 string
+	if rf, ok := ret.Get(0).(func() string); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Get(0).(string)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func() error); ok {
+		r1 = rf()
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
 // GetForLogin provides a mock function with given fields: loginID, allowSignInWithUsername, allowSignInWithEmail
 func (_m *UserStore) GetForLogin(loginID string, allowSignInWithUsername bool, allowSignInWithEmail bool) (*model.User, error) {
 	ret := _m.Called(loginID, allowSignInWithUsername, allowSignInWithEmail)

store/storetest/user_store.go

@@ -94,6 +94,7 @@ func TestUserStore(t *testing.T, ss store.Store, s SqlStore) {
 	t.Run("ResetLastPictureUpdate", func(t *testing.T) { testUserStoreResetLastPictureUpdate(t, ss) })
 	t.Run("GetKnownUsers", func(t *testing.T) { testGetKnownUsers(t, ss) })
 	t.Run("GetUsersWithInvalidEmails", func(t *testing.T) { testGetUsersWithInvalidEmails(t, ss) })
+	t.Run("GetFirstSystemAdminID", func(t *testing.T) { testUserStoreGetFirstSystemAdminID(t, ss) })
 }
 
 func testUserStoreSave(t *testing.T, ss store.Store) {
@@ -4163,6 +4164,30 @@ func testCount(t *testing.T, ss store.Store) {
 	}
 }
 
+func testUserStoreGetFirstSystemAdminID(t *testing.T, ss store.Store) {
+	sysAdmin := &model.User{}
+	sysAdmin.Email = MakeEmail()
+	sysAdmin.Roles = model.SystemAdminRoleId + " " + model.SystemUserRoleId
+	sysAdmin, err := ss.User().Save(sysAdmin)
+	require.NoError(t, err)
+	defer func() { require.NoError(t, ss.User().PermanentDelete(sysAdmin.Id)) }()
+
+	// We need the second system admin to be created after the first one
+	// our granulirity is ms
+	time.Sleep(1 * time.Millisecond)
+
+	sysAdmin2 := &model.User{}
+	sysAdmin2.Email = MakeEmail()
+	sysAdmin2.Roles = model.SystemAdminRoleId + " " + model.SystemUserRoleId
+	sysAdmin2, err = ss.User().Save(sysAdmin2)
+	require.NoError(t, err)
+	defer func() { require.NoError(t, ss.User().PermanentDelete(sysAdmin2.Id)) }()
+
+	returnedId, err := ss.User().GetFirstSystemAdminID()
+	require.NoError(t, err)
+	require.Equal(t, sysAdmin.Id, returnedId)
+}
+
 func testUserStoreAnalyticsActiveCount(t *testing.T, ss store.Store, s SqlStore) {
 
 	cleanupStatusStore(t, s)

store/timerlayer/timerlayer.go

@@ -9727,6 +9727,22 @@ func (s *TimerLayerUserStore) GetEtagForProfilesNotInTeam(teamID string) string
 	return result
 }
 
+func (s *TimerLayerUserStore) GetFirstSystemAdminID() (string, error) {
+	start := time.Now()
+
+	result, err := s.UserStore.GetFirstSystemAdminID()
+
+	elapsed := float64(time.Since(start)) / float64(time.Second)
+	if s.Root.Metrics != nil {
+		success := "false"
+		if err == nil {
+			success = "true"
+		}
+		s.Root.Metrics.ObserveStoreMethodDuration("UserStore.GetFirstSystemAdminID", success, elapsed)
+	}
+	return result, err
+}
+
 func (s *TimerLayerUserStore) GetForLogin(loginID string, allowSignInWithUsername bool, allowSignInWithEmail bool) (*model.User, error) {
 	start := time.Now()