Golang trace.FromContext函數代碼示例

func (s *SpaceService) ByUser(ctx context.Context, u *User) ([]*Space, error) {
	span := trace.FromContext(ctx).NewChild("trythings.space.ByUser")
	defer span.Finish()

	var sps []*Space
	_, err := datastore.NewQuery("Space").
		Ancestor(datastore.NewKey(ctx, "Root", "root", 0, nil)).
		Filter("UserIDs =", u.ID).
		GetAll(ctx, &sps)
	if err != nil {
		return nil, err
	}

	var ac []*Space
	for _, sp := range sps {
		ok, err := s.IsVisible(ctx, sp)
		if err != nil {
			// TODO use multierror
			return nil, err
		}

		if ok {
			ac = append(ac, sp)
		}
	}

	return ac, nil
}

func (s *MigrationService) RunAll(ctx context.Context) error {
	span := trace.FromContext(ctx).NewChild("trythings.migration.RunAll")
	defer span.Finish()

	su, err := IsSuperuser(ctx)
	if err != nil {
		return err
	}
	if !su {
		return errors.New("must run migrations as superuser")
	}

	latest, err := s.latestVersion(ctx)
	if err != nil {
		return err
	}
	log.Infof(ctx, "running all migrations. latest is %s", latest)

	for _, m := range migrations {
		if m.Version.After(latest) {
			log.Infof(ctx, "running migration version %s", m.Version)
			err = s.run(ctx, m)
			if err != nil {
				return err
			}
		}
	}

	return nil
}

func (s *ViewService) BySpace(ctx context.Context, sp *Space) ([]*View, error) {
	span := trace.FromContext(ctx).NewChild("trythings.view.BySpace")
	defer span.Finish()

	var vs []*View
	_, err := datastore.NewQuery("View").
		Ancestor(datastore.NewKey(ctx, "Root", "root", 0, nil)).
		Filter("SpaceID =", sp.ID).
		GetAll(ctx, &vs)
	if err != nil {
		return nil, err
	}

	var ac []*View
	for _, v := range vs {
		ok, err := s.IsVisible(ctx, v)
		if err != nil {
			// TODO use multierror
			return nil, err
		}

		if ok {
			ac = append(ac, v)
		}
	}

	return ac, nil
}

func (s *TaskService) ByID(ctx context.Context, id string) (*Task, error) {
	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "Task", id, 0, rootKey)

	ct, ok := CacheFromContext(ctx).Get(k).(*Task)
	if ok {
		return ct, nil
	}
	span := trace.FromContext(ctx).NewChild("trythings.task.ByID")
	defer span.Finish()

	var t Task
	err := datastore.Get(ctx, k, &t)
	if err != nil {
		return nil, err
	}

	ok, err = s.IsVisible(ctx, &t)
	if err != nil {
		return nil, err
	}

	if !ok {
		return nil, errors.New("cannot access task")
	}

	CacheFromContext(ctx).Set(k, &t)
	return &t, nil
}

func (s *SearchService) Update(ctx context.Context, se *Search) error {
	span := trace.FromContext(ctx).NewChild("trythings.search.Update")
	defer span.Finish()

	if se.ID == "" {
		return errors.New("cannot update search with no ID")
	}

	// Make sure we have access to the search before it was modified.
	_, err := s.ByID(ctx, se.ID)
	if err != nil {
		return err
	}

	// Make sure we continue to have access to the task after our update.
	ok, err := s.IsVisible(ctx, se)
	if err != nil {
		return err
	}

	if !ok {
		return errors.New("cannot update search to lose access")
	}

	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "Search", se.ID, 0, rootKey)
	_, err = datastore.Put(ctx, k, se)
	if err != nil {
		return err
	}

	CacheFromContext(ctx).Set(k, se)
	return nil
}

// ByIDs filters out Tasks that are not visible to the current User.
func (s *TaskService) ByIDs(ctx context.Context, ids []string) ([]*Task, error) {
	span := trace.FromContext(ctx).NewChild("trythings.task.ByIDs")
	defer span.Finish()

	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)

	ks := []*datastore.Key{}
	for _, id := range ids {
		ks = append(ks, datastore.NewKey(ctx, "Task", id, 0, rootKey))
	}

	var allTasks = make([]*Task, len(ks))
	err := datastore.GetMulti(ctx, ks, allTasks)
	if err != nil {
		return nil, err
	}

	ts := []*Task{}
	for _, t := range allTasks {
		// TODO#Perf: Batch the isVisible check.
		ok, err := s.IsVisible(ctx, t)
		if err != nil {
			return nil, err
		}
		if !ok {
			continue
		}

		ts = append(ts, t)
	}

	return ts, nil
}

func (s *UserService) Create(ctx context.Context, u *User) error {
	span := trace.FromContext(ctx).NewChild("trythings.user.Create")
	defer span.Finish()

	// TODO Make sure u.GoogleID == user.Current(ctx).ID

	if u.ID != "" {
		return fmt.Errorf("u already has id %q", u.ID)
	}

	if u.CreatedAt.IsZero() {
		u.CreatedAt = time.Now()
	}

	id, _, err := datastore.AllocateIDs(ctx, "User", nil, 1)
	if err != nil {
		return err
	}
	u.ID = fmt.Sprintf("%x", id)

	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "User", u.ID, 0, rootKey)
	k, err = datastore.Put(ctx, k, u)
	if err != nil {
		return err
	}

	return nil
}

func (s *SearchService) ByView(ctx context.Context, v *View) ([]*Search, error) {
	span := trace.FromContext(ctx).NewChild("trythings.search.ByView")
	defer span.Finish()

	var ss []*Search
	_, err := datastore.NewQuery("Search").
		Ancestor(datastore.NewKey(ctx, "Root", "root", 0, nil)).
		Filter("ViewID =", v.ID).
		Order("ViewRank").
		GetAll(ctx, &ss)
	if err != nil {
		return nil, err
	}

	var ac []*Search
	for _, se := range ss {
		ok, err := s.IsVisible(ctx, se)
		if err != nil {
			// TODO use multierror
			return nil, err
		}

		if ok {
			ac = append(ac, se)
		}
	}

	return ac, nil
}

func (s *ViewService) ByID(ctx context.Context, id string) (*View, error) {
	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "View", id, 0, rootKey)

	cv, ok := CacheFromContext(ctx).Get(k).(*View)
	if ok {
		return cv, nil
	}
	span := trace.FromContext(ctx).NewChild("trythings.view.ByID")
	defer span.Finish()

	var v View
	err := datastore.Get(ctx, k, &v)
	if err != nil {
		return nil, err
	}

	ok, err = s.IsVisible(ctx, &v)
	if err != nil {
		return nil, err
	}
	if !ok {
		return nil, errors.New("cannot access view")
	}

	CacheFromContext(ctx).Set(k, &v)
	return &v, nil
}

func (s *SpaceService) ByID(ctx context.Context, id string) (*Space, error) {
	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "Space", id, 0, rootKey)

	csp, ok := CacheFromContext(ctx).Get(k).(*Space)
	if ok {
		return csp, nil
	}
	span := trace.FromContext(ctx).NewChild("trythings.space.ByID")
	defer span.Finish()

	var sp Space
	err := datastore.Get(ctx, k, &sp)
	if err != nil {
		return nil, err
	}

	ok, err = s.IsVisible(ctx, &sp)
	if err != nil {
		return nil, err
	}
	if !ok {
		return nil, errors.New("cannot access space")
	}

	CacheFromContext(ctx).Set(k, &sp)
	return &sp, nil
}

func GetGoogleUser(ctx context.Context, idToken string) (*GoogleUser, error) {
	span := trace.FromContext(ctx).NewChild("trythings.google_user.GetGoogleUser")
	defer span.Finish()

	tok, err := jwt.ParseSigned(idToken)
	if err != nil {
		return nil, err
	}

	if len(tok.Headers) != 1 {
		// We must have a header to specify a kid.
		// We don't know how to handle multiple headers,
		// since it's unclear which kid to use.
		return nil, errors.New("expected exactly one token header")
	}

	keys := googleKeys.Key(tok.Headers[0].KeyID)
	if len(keys) == 0 {
		err := updateGoogleKeys(ctx)
		if err != nil {
			return nil, err
		}
		keys = googleKeys.Key(tok.Headers[0].KeyID)
	}

	if len(keys) != 1 {
		// We must have a key to check the signature.
		// We don't know how to deal with multiple keys matching the same kid.
		return nil, errors.New("expected exactly one key matching kid")
	}
	key := keys[0]

	var payload struct {
		jwt.Claims
		GoogleUser
	}
	err = tok.Claims(&payload, key.Key)
	if err != nil {
		return nil, err
	}

	expectedIssuer := "accounts.google.com"
	if strings.HasPrefix(payload.Issuer, "https://") {
		expectedIssuer = "https://accounts.google.com"
	}

	err = payload.Validate(jwt.Expected{
		Issuer:   expectedIssuer,
		Audience: []string{"695504958192-8k3tf807271m7jcllcvlauddeqhbr0hg.apps.googleusercontent.com"},
		Time:     time.Now(),
	})
	if err != nil {
		return nil, err
	}

	return &payload.GoogleUser, nil
}

// FromContext should not be subject to access control,
// because it would create a circular dependency.
func (s *UserService) FromContext(ctx context.Context) (*User, error) {
	span := trace.FromContext(ctx).NewChild("trythings.user.FromContext")
	defer span.Finish()

	gu, ok := GoogleUserFromContext(ctx)
	if !ok {
		return nil, errors.New("expected google user, probably missing Authorization header")
	}
	return s.byGoogleID(ctx, gu.ID)
}

func (s *TaskService) Index(ctx context.Context, t *Task) error {
	span := trace.FromContext(ctx).NewChild("trythings.task.Index")
	defer span.Finish()

	index, err := search.Open("Task")
	if err != nil {
		return err
	}
	_, err = index.Put(ctx, t.ID, t)
	if err != nil {
		return err
	}
	return nil
}

func (s *TaskService) Create(ctx context.Context, t *Task) error {
	span := trace.FromContext(ctx).NewChild("trythings.task.Create")
	defer span.Finish()

	if t.ID != "" {
		return fmt.Errorf("t already has id %q", t.ID)
	}

	if t.CreatedAt.IsZero() {
		t.CreatedAt = time.Now()
	}

	if t.SpaceID == "" {
		return errors.New("SpaceID is required")
	}

	ok, err := s.IsVisible(ctx, t)
	if err != nil {
		return err
	}

	if !ok {
		return errors.New("cannot access space to create task")
	}

	id, _, err := datastore.AllocateIDs(ctx, "Task", nil, 1)
	if err != nil {
		return err
	}
	t.ID = fmt.Sprintf("%x", id)

	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "Task", t.ID, 0, rootKey)
	k, err = datastore.Put(ctx, k, t)
	if err != nil {
		return err
	}

	err = s.Index(ctx, t)
	if err != nil {
		return err
	}

	return nil
}

func (s *ViewService) Create(ctx context.Context, v *View) error {
	span := trace.FromContext(ctx).NewChild("trythings.view.Create")
	defer span.Finish()

	if v.ID != "" {
		return fmt.Errorf("v already has id %q", v.ID)
	}

	if v.CreatedAt.IsZero() {
		v.CreatedAt = time.Now()
	}

	if v.Name == "" {
		return errors.New("Name is required")
	}

	if v.SpaceID == "" {
		return errors.New("SpaceID is required")
	}

	ok, err := s.IsVisible(ctx, v)
	if err != nil {
		return err
	}

	if !ok {
		return errors.New("cannot access space to create view")
	}

	id, _, err := datastore.AllocateIDs(ctx, "View", nil, 1)
	if err != nil {
		return err
	}
	v.ID = fmt.Sprintf("%x", id)

	rootKey := datastore.NewKey(ctx, "Root", "root", 0, nil)
	k := datastore.NewKey(ctx, "View", v.ID, 0, rootKey)
	k, err = datastore.Put(ctx, k, v)
	if err != nil {
		return err
	}

	return nil
}