add_torrent_params.hpp

/*

Copyright (c) 2009-2018, Arvid Norberg
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*/

#ifndef TORRENT_ADD_TORRENT_PARAMS_HPP_INCLUDED
#define TORRENT_ADD_TORRENT_PARAMS_HPP_INCLUDED

#include <string>
#include <vector>
#include <boost/shared_ptr.hpp>

#include "libtorrent/storage_defs.hpp"
#include "libtorrent/peer_id.hpp" // sha1_hash
#include "libtorrent/version.hpp"

namespace libtorrent
{
	class torrent_info;
	struct torrent_plugin;
	struct torrent_handle;

	// The add_torrent_params is a parameter pack for adding torrents to a
	// session. The key fields when adding a torrent are:
	//
	// * ti - when you have a .torrent file
	// * url - when you have a magnet link
	// * info_hash - when all you have is an info-hash (this is similar to a
	//   magnet link)
	//
	// one of those fields need to be set. Another mandatory field is
	// ``save_path``. The add_torrent_params object is passed into one of the
	// ``session::add_torrent()`` overloads or ``session::async_add_torrent()``.
	//
	// If you only specify the info-hash, the torrent file will be downloaded
	// from peers, which requires them to support the metadata extension. For
	// the metadata extension to work, libtorrent must be built with extensions
	// enabled (``TORRENT_DISABLE_EXTENSIONS`` must not be defined). It also
	// takes an optional ``name`` argument. This may be left empty in case no
	// name should be assigned to the torrent. In case it's not, the name is
	// used for the torrent as long as it doesn't have metadata. See
	// ``torrent_handle::name``.
	//
#include "libtorrent/aux_/disable_warnings_push.hpp"
	struct TORRENT_EXPORT add_torrent_params
	{
		// The constructor can be used to initialize the storage constructor,
		// which determines the storage mechanism for the downloaded or seeding
		// data for the torrent. For more information, see the ``storage`` field.
		add_torrent_params(storage_constructor_type sc = default_storage_constructor)
			: version(LIBTORRENT_VERSION_NUM)
#ifndef TORRENT_NO_DEPRECATE
			, tracker_url(0)
#endif
			, storage_mode(storage_mode_sparse)
			, storage(sc)
			, userdata(0)
#ifndef TORRENT_NO_DEPRECATE
			, flags(flag_ignore_flags | default_flags)
#else
			, flags(default_flags)
#endif
			, max_uploads(-1)
			, max_connections(-1)
			, upload_limit(-1)
			, download_limit(-1)
#ifndef TORRENT_NO_DEPRECATE
			, seed_mode(false)
			, override_resume_data(false)
			, upload_mode(false)
			, share_mode(false)
			, apply_ip_filter(true)
			, paused(true)
			, auto_managed(true)
			, duplicate_is_error(false)
			, merge_resume_trackers(false)
#endif
		{
		}

#ifndef TORRENT_NO_DEPRECATE
		TORRENT_DEPRECATED
		void update_flags() const
		{
			if (flags != (flag_ignore_flags | default_flags)) return;

			boost::uint64_t& f = const_cast<boost::uint64_t&>(flags);
			f = flag_update_subscribe;
			if (seed_mode) f |= flag_seed_mode;
			if (override_resume_data) f |= flag_override_resume_data;
			if (upload_mode) f |= flag_upload_mode;
			if (share_mode) f |= flag_share_mode;
			if (apply_ip_filter) f |= flag_apply_ip_filter;
			if (paused) f |= flag_paused;
			if (auto_managed) f |= flag_auto_managed;
			if (duplicate_is_error) f |= flag_duplicate_is_error;
			if (merge_resume_trackers) f |= flag_merge_resume_trackers;
		}
#endif

#include "libtorrent/aux_/disable_warnings_pop.hpp"

		// values for the ``flags`` field
		enum flags_t
		{
			// If ``flag_seed_mode`` is set, libtorrent will assume that all files
			// are present for this torrent and that they all match the hashes in
			// the torrent file. Each time a peer requests to download a block,
			// the piece is verified against the hash, unless it has been verified
			// already. If a hash fails, the torrent will automatically leave the
			// seed mode and recheck all the files. The use case for this mode is
			// if a torrent is created and seeded, or if the user already know
			// that the files are complete, this is a way to avoid the initial
			// file checks, and significantly reduce the startup time.
			// 
			// Setting ``flag_seed_mode`` on a torrent without metadata (a
			// .torrent file) is a no-op and will be ignored.
			// 
			// If resume data is passed in with this torrent, the seed mode saved
			// in there will override the seed mode you set here.
			flag_seed_mode = 0x001,

			// If ``flag_override_resume_data`` is set, flags set for this torrent
			// in this ``add_torrent_params`` object will take precedence over
			// whatever states are saved in the resume data. For instance, the
			// ``paused``, ``auto_managed``, ``sequential_download``, ``seed_mode``,
			// ``super_seeding``, ``max_uploads``, ``max_connections``,
			// ``upload_limit`` and ``download_limit`` are all affected by this
			// flag. The intention of this flag is to have any field in
			// add_torrent_params configuring the torrent override the corresponding
			// configuration from the resume file, with the one exception of save
			// resume data, which has its own flag (for historic reasons).
			// "file_priorities" and "save_path" are not affected by this flag.
			flag_override_resume_data = 0x002,

			// If ``flag_upload_mode`` is set, the torrent will be initialized in
			// upload-mode, which means it will not make any piece requests. This
			// state is typically entered on disk I/O errors, and if the torrent
			// is also auto managed, it will be taken out of this state
			// periodically. This mode can be used to avoid race conditions when
			// adjusting priorities of pieces before allowing the torrent to start
			// downloading.
			// 
			// If the torrent is auto-managed (``flag_auto_managed``), the torrent
			// will eventually be taken out of upload-mode, regardless of how it
			// got there. If it's important to manually control when the torrent
			// leaves upload mode, don't make it auto managed.
			flag_upload_mode = 0x004,

			// determines if the torrent should be added in *share mode* or not.
			// Share mode indicates that we are not interested in downloading the
			// torrent, but merely want to improve our share ratio (i.e. increase
			// it). A torrent started in share mode will do its best to never
			// download more than it uploads to the swarm. If the swarm does not
			// have enough demand for upload capacity, the torrent will not
			// download anything. This mode is intended to be safe to add any
			// number of torrents to, without manual screening, without the risk
			// of downloading more than is uploaded.
			// 
			// A torrent in share mode sets the priority to all pieces to 0,
			// except for the pieces that are downloaded, when pieces are decided
			// to be downloaded. This affects the progress bar, which might be set
			// to "100% finished" most of the time. Do not change file or piece
			// priorities for torrents in share mode, it will make it not work.
			// 
			// The share mode has one setting, the share ratio target, see
			// ``settings_pack::share_mode_target`` for more info.
			flag_share_mode = 0x008,

			// determines if the IP filter should apply to this torrent or not. By
			// default all torrents are subject to filtering by the IP filter
			// (i.e. this flag is set by default). This is useful if certain
			// torrents needs to be exempt for some reason, being an auto-update
			// torrent for instance.
			flag_apply_ip_filter = 0x010,

			// specifies whether or not the torrent is to be started in a paused
			// state. I.e. it won't connect to the tracker or any of the peers
			// until it's resumed. This is typically a good way of avoiding race
			// conditions when setting configuration options on torrents before
			// starting them.
			flag_paused = 0x020,

			// If the torrent is auto-managed (``flag_auto_managed``), the torrent
			// may be resumed at any point, regardless of how it paused. If it's
			// important to manually control when the torrent is paused and
			// resumed, don't make it auto managed.
			// 
			// If ``flag_auto_managed`` is set, the torrent will be queued,
			// started and seeded automatically by libtorrent. When this is set,
			// the torrent should also be started as paused. The default queue
			// order is the order the torrents were added. They are all downloaded
			// in that order. For more details, see queuing_.
			// 
			// If you pass in resume data, the auto_managed state of the torrent
			// when the resume data was saved will override the auto_managed state
			// you pass in here. You can override this by setting
			// ``override_resume_data``.
			flag_auto_managed = 0x040,
			flag_duplicate_is_error = 0x080,

			// defaults to off and specifies whether tracker URLs loaded from
			// resume data should be added to the trackers in the torrent or
			// replace the trackers. When replacing trackers (i.e. this flag is not
			// set), any trackers passed in via add_torrent_params are also
			// replaced by any trackers in the resume data. The default behavior is
			// to have the resume data override the .torrent file _and_ the
			// trackers added in add_torrent_params.
			flag_merge_resume_trackers = 0x100,

			// on by default and means that this torrent will be part of state
			// updates when calling post_torrent_updates().
			flag_update_subscribe = 0x200,

			// sets the torrent into super seeding mode. If the torrent is not a
			// seed, this flag has no effect. It has the same effect as calling
			// ``torrent_handle::super_seeding(true)`` on the torrent handle
			// immediately after adding it.
			flag_super_seeding = 0x400,

			// sets the sequential download state for the torrent. It has the same
			// effect as calling ``torrent_handle::sequential_download(true)`` on
			// the torrent handle immediately after adding it.
			flag_sequential_download = 0x800,

			// if this flag is set, the save path from the resume data file, if
			// present, is honored. This defaults to not being set, in which
			// case the save_path specified in add_torrent_params is always used.
			flag_use_resume_save_path = 0x1000,

			// indicates that this torrent should never be unloaded from RAM, even
			// if unloading torrents are allowed in general. Setting this makes
			// the torrent exempt from loading/unloading management.
			flag_pinned = 0x2000,

			// defaults to off and specifies whether web seed URLs loaded from
			// resume data should be added to the ones in the torrent file or
			// replace them. No distinction is made between the two different kinds
			// of web seeds (`BEP 17`_ and `BEP 19`_). When replacing web seeds
			// (i.e. when this flag is not set), any web seeds passed in via
			// add_torrent_params are also replaced. The default behavior is to
			// have any web seeds in the resume data take precedence over whatever
			// is passed in here as well as the .torrent file.
			flag_merge_resume_http_seeds = 0x8000,

			// the stop when ready flag. Setting this flag is equivalent to calling
			// torrent_handle::stop_when_ready() immediately after the torrent is
			// added.
			flag_stop_when_ready = 0x4000,

			// internal
			default_flags = flag_pinned | flag_update_subscribe | flag_auto_managed | flag_paused | flag_apply_ip_filter

#ifndef TORRENT_NO_DEPRECATE
			, flag_ignore_flags TORRENT_DEPRECATED_ENUM = 0x80000000
#endif
		};

		// filled in by the constructor and should be left untouched. It is used
		// for forward binary compatibility.
		int version;
		// torrent_info object with the torrent to add. Unless the url or
		// info_hash is set, this is required to be initialized.
		boost::shared_ptr<torrent_info> ti;

#ifndef TORRENT_NO_DEPRECATE
		char const* TORRENT_DEPRECATED_MEMBER tracker_url;
#endif
		// If the torrent doesn't have a tracker, but relies on the DHT to find
		// peers, the ``trackers`` can specify tracker URLs for the torrent.
		std::vector<std::string> trackers;

		// url seeds to be added to the torrent (`BEP 17`_).
		std::vector<std::string> url_seeds;

		// a list of hostname and port pairs, representing DHT nodes to be added
		// to the session (if DHT is enabled). The hostname may be an IP address.
		std::vector<std::pair<std::string, int> > dht_nodes;
		std::string name;

		// the path where the torrent is or will be stored. Note that this may
		// also be stored in resume data. If you want the save path saved in
		// the resume data to be used, you need to set the
		// flag_use_resume_save_path flag.
		// 
		// .. note::
		// 	On windows this path (and other paths) are interpreted as UNC
		// 	paths. This means they must use backslashes as directory separators
		// 	and may not contain the special directories "." or "..".
		// 
		// Setting this to an absolute path performs slightly better than a
		// relative path.
		std::string save_path;

		// The optional parameter, ``resume_data`` can be given if up to date
		// fast-resume data is available. The fast-resume data can be acquired
		// from a running torrent by calling save_resume_data() on
		// torrent_handle. See fast-resume_. The ``vector`` that is passed in
		// will be swapped into the running torrent instance with
		// ``std::vector::swap()``.
		std::vector<char> resume_data;

		// One of the values from storage_mode_t. For more information, see
		// storage-allocation_.
		storage_mode_t storage_mode;

		// can be used to customize how the data is stored. The default storage
		// will simply write the data to the files it belongs to, but it could be
		// overridden to save everything to a single file at a specific location
		// or encrypt the content on disk for instance. For more information
		// about the storage_interface that needs to be implemented for a custom
		// storage, see storage_interface.
		storage_constructor_type storage;

		// The ``userdata`` parameter is optional and will be passed on to the
		// extension constructor functions, if any
		// (see torrent_handle::add_extension()).
		void* userdata;

		// can be set to control the initial file priorities when adding a
		// torrent. The semantics are the same as for
		// ``torrent_handle::prioritize_files()``. The file priorities specified
		// in here take precedence over those specified in the resume data, if
		// any.
		std::vector<boost::uint8_t> file_priorities;

		// torrent extension construction functions can be added to this vector
		// to have them be added immediately when the torrent is constructed.
		// This may be desired over the torrent_handle::add_extension() in order
		// to avoid race conditions. For instance it may be important to have the
		// plugin catch events that happen very early on after the torrent is
		// created.
		std::vector<boost::function<boost::shared_ptr<torrent_plugin>(torrent_handle const&, void*)> >
			extensions;

		// the default tracker id to be used when announcing to trackers. By
		// default this is empty, and no tracker ID is used, since this is an
		// optional argument. If a tracker returns a tracker ID, that ID is used
		// instead of this.
		std::string trackerid;

		// If you specify a ``url``, the torrent will be set in
		// ``downloading_metadata`` state until the .torrent file has been
		// downloaded. If there's any error while downloading, the torrent will
		// be stopped and the torrent error state (``torrent_status::error``)
		// will indicate what went wrong. The ``url`` may be set to a magnet link.
		std::string url;

		// if ``uuid`` is specified, it is used to find duplicates. If another
		// torrent is already running with the same UUID as the one being added,
		// it will be considered a duplicate. This is mainly useful for RSS feed
		// items which has UUIDs specified.
		std::string uuid;

		// should point to the URL of the RSS feed this torrent comes from, if it
		// comes from an RSS feed.
		std::string source_feed_url;

		// flags controlling aspects of this torrent and how it's added. See
		// flags_t for details.
		// 
		// .. note::
		// 	The ``flags`` field is initialized with default flags by the
		// 	constructor. In order to preserve default behavior when clearing or
		// 	setting other flags, make sure to bitwise OR or in a flag or bitwise
		// 	AND the inverse of a flag to clear it.
		boost::uint64_t flags;

		// set this to the info hash of the torrent to add in case the info-hash
		// is the only known property of the torrent. i.e. you don't have a
		// .torrent file nor a magnet link.
		sha1_hash info_hash;

		// ``max_uploads``, ``max_connections``, ``upload_limit``,
		// ``download_limit`` correspond to the ``set_max_uploads()``,
		// ``set_max_connections()``, ``set_upload_limit()`` and
		// ``set_download_limit()`` functions on torrent_handle. These values let
		// you initialize these settings when the torrent is added, instead of
		// calling these functions immediately following adding it.
		// 
		// -1 means unlimited on these settings just like their counterpart
		// functions on torrent_handle
		// 
		// For fine grained control over rate limits depending on various
		// properties of the peer connection, see peer-classes_.
		int max_uploads;
		int max_connections;
		int upload_limit;
		int download_limit;

#ifndef TORRENT_NO_DEPRECATE
		bool TORRENT_DEPRECATED_MEMBER seed_mode;
		bool TORRENT_DEPRECATED_MEMBER override_resume_data;
		bool TORRENT_DEPRECATED_MEMBER upload_mode;
		bool TORRENT_DEPRECATED_MEMBER share_mode;
		bool TORRENT_DEPRECATED_MEMBER apply_ip_filter;
		bool TORRENT_DEPRECATED_MEMBER paused;
		bool TORRENT_DEPRECATED_MEMBER auto_managed;
		bool TORRENT_DEPRECATED_MEMBER duplicate_is_error;
		bool TORRENT_DEPRECATED_MEMBER merge_resume_trackers;
#endif

	};
}

#endif