151 lines
7.0 KiB
ReStructuredText
151 lines
7.0 KiB
ReStructuredText
===========================
|
|
Upgrading to libtorrent 1.2
|
|
===========================
|
|
|
|
:Author: Arvid Norberg, arvid@libtorrent.org
|
|
|
|
.. contents:: Table of contents
|
|
:depth: 1
|
|
:backlinks: none
|
|
|
|
libtorrent version 1.2 comes with some significant updates in the API.
|
|
This document summarizes the changes affecting library users.
|
|
|
|
C++98 no longer supported
|
|
=========================
|
|
|
|
With libtorrent 1.2, C++98 is no longer supported, you need a compiler capable
|
|
of at least C++11 to build libtorrent.
|
|
|
|
This also means libtorrent types now support move.
|
|
|
|
forward declaring libtorrent types deprecated
|
|
=============================================
|
|
|
|
Clients are discouraged from forward declaring types from libtorrent.
|
|
Instead, include the <libtorrent/fwd.hpp> header.
|
|
|
|
A future release will intrduce ABI versioning using an inline namespace, which will break any forward declarations by clients.
|
|
|
|
There is a new namespace alias, ``lt`` which is shorthand for ``libtorrent``.
|
|
In the future, ``libtorrent`` will be the alias and ``lt`` the namespace name.
|
|
With no forward declarations inside libtorrent's namespace though, there should not be any reason for clients to re-open the namespace.
|
|
|
|
resume data handling
|
|
====================
|
|
|
|
To significantly simplify handling of resume data, the previous way of handling it is deprecated.
|
|
resume data is no longer passed in as a flat buffer in the add_torrent_params.
|
|
The add_torrent_params structure itself *is* the resume data now.
|
|
|
|
In order to parse the bencoded fast resume file (which is still the same format, and backwards compatible) use the read_resume_data() function.
|
|
|
|
Similarly, when saving resume data, the save_resume_data_alert now has a ``params`` field of type add_torrent_params which contains the resume data.
|
|
This object can be serialized into the bencoded form using write_resume_data().
|
|
|
|
This give the client full control over which properties should be loaded from the resume data and which should be controlled by the client directly.
|
|
The flags ``flag_override_resume_data``, ``flag_merge_resume_trackers``, ``flag_use_resume_save_path`` and ``flag_merge_resume_http_seeds`` have all been deprecated, since they are no longer needed.
|
|
|
|
The old API is still supported as long as libtorrent is built with deprecated functions enabled (which is the default).
|
|
It will be performing slightly better without deprecated functions present.
|
|
|
|
rate_limit_utp changed defaults
|
|
===============================
|
|
|
|
The setting ``rate_limit_utp`` was deprecated in libtorrent 1.1.
|
|
When building without deprecated features (``deprecated-functions=off``) the default behavior also changed to have rate limits apply to utp sockets too.
|
|
In order to be more consistent between the two build configurations, the default value has changed to true.
|
|
The new mechanism provided to apply special rate limiting rules is *peer classes*.
|
|
In order to implement the old behavior of not rate limiting uTP peers, one can set up a peer class for all uTP peers, to make the normal peer classes not apply to them (which is where the rate limits are set).
|
|
|
|
announce entry multi-home support
|
|
=================================
|
|
|
|
The announce_entry type now captures status on individual endpoints, as opposed to treating every tracker behind the same name as a single tracker.
|
|
This means some properties has moved into the ``announce_endpoint`` structure, and an announce entry has 0 or more endpoints.
|
|
|
|
alerts no longer cloneable
|
|
==========================
|
|
|
|
As part of the transition to a more efficient handling of alerts, 1.1 allocated them in a contiguous, heterogeneous, vector.
|
|
This means they are no longer heap allocated nor held by a smart pointer.
|
|
The ``clone()`` member on alerts was deprecated in 1.1 and removed in 1.2.
|
|
To pass alerts across threads, instead pull out the relevant information from the alerts and pass that across.
|
|
|
|
progress alert category
|
|
=======================
|
|
|
|
The ``alert::progress_notification`` category has been deprecated.
|
|
Alerts posted in this category are now also posted in one of these new categories:
|
|
|
|
* ``alert::block_progress_notification``
|
|
* ``alert::piece_progress_notification``
|
|
* ``alert::file_progress_notification``
|
|
* ``alert::upload_notification``
|
|
|
|
boost replaced by std
|
|
=====================
|
|
|
|
``boost::shared_ptr`` has been replaced by ``std::shared_ptr`` in the libtorrent API.
|
|
The same goes for ``<cstdint>`` types, instead of ``boost::int64_t``, libtorrent now uses ``std::int64_t``.
|
|
Instead of ``boost::array``, ``std::array`` is used, and ``boost::function`` has been replaced by ``std::fuction``.
|
|
|
|
strong typedefs
|
|
===============
|
|
|
|
In order to strengthen type-safety, libtorrent now uses special types to represent certain indexes and ID types.
|
|
Any integer referring to a piece index, now has the type ``piece_index_t``, and indices to files in a torrent, use ``file_index_t``.
|
|
Similarly, time points and duration now use ``time_point`` and ``duration`` from the ``<chrono>`` standard library.
|
|
|
|
The specific types have typedefs at ``lt::time_point`` and ``lt::duration``, and the clock used by libtorrent is ``lt::clock_type``.`
|
|
|
|
strongly typed flags
|
|
====================
|
|
|
|
Enum flags have been replaced by strongly typed flags.
|
|
This means their implicit conversion to and from ``int`` is deprecated.
|
|
For example, the following expressions are deprecated::
|
|
|
|
if ((atp.flags & add_torrent_params::flag_paused) == 0)
|
|
|
|
atp.flags = 0;
|
|
|
|
Insted say::
|
|
|
|
if (!(atp.flags & torrent_flags::paused))
|
|
|
|
atp.flags = {};
|
|
|
|
(Also note that in this specific example, the flags moved out of the ``add_torrent_params`` structure, but this is unrelated to them also having stronger types).
|
|
|
|
span<> and string_view
|
|
======================
|
|
|
|
The interface has adopted ``string_view`` (from boost for now) and ``span<>`` (custom implementation for now).
|
|
This means some function calls that previously took ``char const*`` or ``std::string`` may now take an ``lt::string_view``.
|
|
Similarly, functions that previously would take a pointer and length pair will now take a ``span<>``.
|
|
|
|
periphery utility functions no longer exported
|
|
==============================================
|
|
|
|
Historically, libtorrent has exported functions not essential to its core bittorrent functionality.
|
|
Such as filesystem functions like ``directory``, ``file`` classes and ``remove``, ``create_directory`` functions.
|
|
Path manipulation functions like ``combine_path``, ``extension``, ``split_path`` etc.
|
|
String manipulation functions like ``from_hex`` and ``to_hex``.
|
|
Time functions like ``time_now``. These functions are no longer available to clients, and some have been removed from the library.
|
|
Instead, it is recommended to use boost.filesystem or the experimental filesystem TS.
|
|
|
|
plugins
|
|
=======
|
|
|
|
libtorrent session plugins no longer have all callbacks called unconditionally.
|
|
The plugin has to register which callbacks it's interested in receiving by returning a bitmask from ``feature_flags_t implemented_features()``.
|
|
The return value is documented in the plugin class.
|
|
|
|
RSS functions removed
|
|
=====================
|
|
|
|
The deprecated RSS functions have been removed from the library interface.
|
|
|
|
|