Method writeChildUnarchiveGuard

coderd/exp_chats.go:2929–2953

writeChildUnarchiveGuard returns a 400 early when a child unarchive request obviously races an archived parent. The durable invariant is enforced atomically in chatd.Server.UnarchiveChat; this guard just surfaces the error before we take any locks. Returns true when a response has been written.

(
	ctx context.Context,
	rw http.ResponseWriter,
	chat database.Chat,
)

//
// Returns true when a response has been written.
func (api *API) writeChildUnarchiveGuard(
	ctx context.Context,
	rw http.ResponseWriter,
	chat database.Chat,
) bool {
	parent, err := api.Database.GetChatByID(ctx, chat.ParentChatID.UUID)
	if err != nil {
		if errors.Is(err, sql.ErrNoRows) {
			httpapi.ResourceNotFound(rw)
			return true
		}
		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
			Message: "Failed to load parent chat.",
			Detail:  err.Error(),
		})
		return true
	}
	if parent.Archived {
		httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
			Message: "Cannot unarchive a child chat while its parent is archived. Unarchive the parent chat to cascade.",
		})
		return true
	}
	return false
}

// EXPERIMENTAL: this endpoint is experimental and is subject to change.
//