296 lines
11 KiB
C++
296 lines
11 KiB
C++
/*
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Copyright (c) 2003-2016, Arvid Norberg, Daniel Wallin
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_ALERT_HPP_INCLUDED
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#define TORRENT_ALERT_HPP_INCLUDED
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#include <string>
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// OVERVIEW
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//
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// The pop_alerts() function on session is the main interface for retrieving
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// alerts (warnings, messages and errors from libtorrent). If no alerts have
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// been posted by libtorrent pop_alerts() will return an empty list.
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//
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// By default, only errors are reported. settings_pack::alert_mask can be
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// used to specify which kinds of events should be reported. The alert mask is
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// comprised by bits from the category_t enum.
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//
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// Every alert belongs to one or more category. There is a cost associated with
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// posting alerts. Only alerts that belong to an enabled category are
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// posted. Setting the alert bitmask to 0 will disable all alerts (except those
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// that are non-discardable). Alerts that are responses to API calls such as
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// save_resume_data() and post_session_stats() are non-discardable and will be
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// posted even if their category is disabled.
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//
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// There are other alert base classes that some alerts derive from, all the
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// alerts that are generated for a specific torrent are derived from
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// torrent_alert, and tracker events derive from tracker_alert.
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//
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// Alerts returned by pop_alerts() are only valid until the next call to
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// pop_alerts(). You may not copy an alert object to access it after the next
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// call to pop_alerts(). Internal members of alerts also become invalid once
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// pop_alerts() is called again.
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#include "libtorrent/time.hpp"
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#include "libtorrent/config.hpp"
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namespace libtorrent
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{
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// The ``alert`` class is the base class that specific messages are derived from.
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// alert types are not copyable, and cannot be constructed by the client. The
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// pointers returned by libtorrent are short lived (the details are described
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// under session_handle::pop_alerts())
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class TORRENT_EXPORT alert
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{
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public:
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alert(alert const& rhs) = delete;
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alert& operator=(alert const&) = delete;
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alert(alert&& rhs) = default;
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#ifndef TORRENT_NO_DEPRECATE
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// only here for backwards compatibility
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enum severity_t { debug, info, warning, critical, fatal, none };
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#endif
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// these are bits for the alert_mask used by the session. See
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// settings_pack::alert_mask.
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enum category_t
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{
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// Enables alerts that report an error. This includes:
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//
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// * tracker errors
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// * tracker warnings
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// * file errors
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// * resume data failures
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// * web seed errors
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// * .torrent files errors
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// * listen socket errors
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// * port mapping errors
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error_notification = 0x1,
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// Enables alerts when peers send invalid requests, get banned or
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// snubbed.
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peer_notification = 0x2,
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// Enables alerts for port mapping events. For NAT-PMP and UPnP.
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port_mapping_notification = 0x4,
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// Enables alerts for events related to the storage. File errors and
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// synchronization events for moving the storage, renaming files etc.
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storage_notification = 0x8,
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// Enables all tracker events. Includes announcing to trackers,
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// receiving responses, warnings and errors.
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tracker_notification = 0x10,
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// Low level alerts for when peers are connected and disconnected.
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debug_notification = 0x20,
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// Enables alerts for when a torrent or the session changes state.
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status_notification = 0x40,
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// Alerts for when blocks are requested and completed. Also when
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// pieces are completed.
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progress_notification = 0x80,
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// Alerts when a peer is blocked by the ip blocker or port blocker.
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ip_block_notification = 0x100,
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// Alerts when some limit is reached that might limit the download
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// or upload rate.
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performance_warning = 0x200,
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// Alerts on events in the DHT node. For incoming searches or
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// bootstrapping being done etc.
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dht_notification = 0x400,
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// If you enable these alerts, you will receive a stats_alert
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// approximately once every second, for every active torrent.
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// These alerts contain all statistics counters for the interval since
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// the lasts stats alert.
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stats_notification = 0x800,
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#ifndef TORRENT_NO_DEPRECATE
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// Alerts on RSS related events, like feeds being updated, feed error
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// conditions and successful RSS feed updates. Enabling this category
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// will make you receive rss_alert alerts.
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rss_notification = 0x1000,
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#endif
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// Enables debug logging alerts. These are available unless libtorrent
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// was built with logging disabled (``TORRENT_DISABLE_LOGGING``). The
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// alerts being posted are log_alert and are session wide.
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session_log_notification = 0x2000,
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// Enables debug logging alerts for torrents. These are available
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// unless libtorrent was built with logging disabled
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// (``TORRENT_DISABLE_LOGGING``). The alerts being posted are
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// torrent_log_alert and are torrent wide debug events.
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torrent_log_notification = 0x4000,
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// Enables debug logging alerts for peers. These are available unless
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// libtorrent was built with logging disabled
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// (``TORRENT_DISABLE_LOGGING``). The alerts being posted are
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// peer_log_alert and low-level peer events and messages.
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peer_log_notification = 0x8000,
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// enables the incoming_request_alert.
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incoming_request_notification = 0x10000,
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// enables dht_log_alert, debug logging for the DHT
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dht_log_notification = 0x20000,
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// enable events from pure dht operations not related to torrents
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dht_operation_notification = 0x40000,
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// enables port mapping log events. This log is useful
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// for debugging the UPnP or NAT-PMP implementation
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port_mapping_log_notification = 0x80000,
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// enables verbose logging from the piece picker.
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picker_log_notification = 0x100000,
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// The full bitmask, representing all available categories.
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//
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// since the enum is signed, make sure this isn't
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// interpreted as -1. For instance, boost.python
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// does that and fails when assigning it to an
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// unsigned parameter.
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all_categories = 0x7fffffff
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};
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// hidden
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alert();
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// hidden
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virtual ~alert();
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// a timestamp is automatically created in the constructor
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time_point timestamp() const;
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// returns an integer that is unique to this alert type. It can be
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// compared against a specific alert by querying a static constant called ``alert_type``
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// in the alert. It can be used to determine the run-time type of an alert* in
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// order to cast to that alert type and access specific members.
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//
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// e.g:
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//
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// .. code:: c++
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//
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// std::vector<alert*> alerts;
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// ses.pop_alerts(&alerts);
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// for (alert* i : alerts) {
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// switch (a->type()) {
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//
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// case read_piece_alert::alert_type:
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// {
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// read_piece_alert* p = (read_piece_alert*)a;
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// if (p->ec) {
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// // read_piece failed
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// break;
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// }
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// // use p
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// break;
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// }
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// case file_renamed_alert::alert_type:
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// {
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// // etc...
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// }
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// }
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// }
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virtual int type() const = 0;
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// returns a string literal describing the type of the alert. It does
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// not include any information that might be bundled with the alert.
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virtual char const* what() const = 0;
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// generate a string describing the alert and the information bundled
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// with it. This is mainly intended for debug and development use. It is not suitable
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// to use this for applications that may be localized. Instead, handle each alert
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// type individually and extract and render the information from the alert depending
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// on the locale.
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virtual std::string message() const = 0;
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// returns a bitmask specifying which categories this alert belong to.
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virtual int category() const = 0;
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#ifndef TORRENT_NO_DEPRECATE
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// determines whether or not an alert is allowed to be discarded
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// when the alert queue is full. There are a few alerts which may not be discared,
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// since they would break the user contract, such as save_resume_data_alert.
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TORRENT_DEPRECATED
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bool discardable() const { return discardable_impl(); }
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TORRENT_DEPRECATED
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severity_t severity() const { return warning; }
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protected:
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virtual bool discardable_impl() const { return true; }
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#endif // TORRENT_NO_DEPRECATE
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private:
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time_point const m_timestamp;
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};
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// When you get an alert, you can use ``alert_cast<>`` to attempt to cast the
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// pointer to a specific alert type, in order to query it for more
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// information.
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//
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// .. note::
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// ``alert_cast<>`` can only cast to an exact alert type, not a base class
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template <class T> T* alert_cast(alert* a)
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{
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static_assert(std::is_base_of<alert, T>::value
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, "alert_cast<> can only be used with alert types (deriving from libtorrent::alert)");
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if (a == nullptr) return nullptr;
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if (a->type() == T::alert_type) return static_cast<T*>(a);
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return nullptr;
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}
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template <class T> T const* alert_cast(alert const* a)
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{
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static_assert(std::is_base_of<alert, T>::value
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, "alert_cast<> can only be used with alert types (deriving from libtorrent::alert)");
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if (a == nullptr) return nullptr;
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if (a->type() == T::alert_type) return static_cast<T const*>(a);
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return nullptr;
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}
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} // namespace libtorrent
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#endif // TORRENT_ALERT_HPP_INCLUDED
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