318 lines
10 KiB
C++
318 lines
10 KiB
C++
/*
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Copyright (c) 2003-2013, 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 <memory>
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#include <deque>
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#include <string>
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#ifdef _MSC_VER
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#pragma warning(push, 1)
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#endif
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#include <boost/preprocessor/repetition/enum_params_with_a_default.hpp>
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#include <boost/preprocessor/repetition/enum.hpp>
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#include <boost/preprocessor/repetition/enum_params.hpp>
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#include <boost/preprocessor/repetition/enum_shifted_params.hpp>
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#include <boost/preprocessor/repetition/enum_shifted_binary_params.hpp>
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// OVERVIEW
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//
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// The pop_alert() function on session is the 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_alert() will return a default initialized
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// ``std::auto_ptr`` object. If there is an alert in libtorrent's queue, the alert
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// from the front of the queue is popped and returned.
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// You can then use the alert object and query
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//
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// By default, only errors are reported. set_alert_mask() can be
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// used to specify which kinds of events should be reported. The alert mask
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// is 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 small cost involved in posting alerts. Only
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// alerts that belong to an enabled category are posted. Setting the alert bitmask to 0 will disable
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// all alerts (except those that are non-discardable).
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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 torrent_alert,
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// and tracker events derive from tracker_alert.
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//
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#include "libtorrent/ptime.hpp"
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#include "libtorrent/config.hpp"
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#ifndef TORRENT_NO_DEPRECATE
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#ifndef BOOST_NO_TYPEID
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#include <typeinfo>
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#endif
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#endif // TORRENT_NO_DEPRECATE
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#ifndef TORRENT_MAX_ALERT_TYPES
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#define TORRENT_MAX_ALERT_TYPES 15
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#endif
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namespace libtorrent {
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// The ``alert`` class is the base class that specific messages are derived from.
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class TORRENT_EXPORT alert
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{
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public:
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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 set_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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// Alerts on RSS related events, like feeds being updated, feed error
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// conditions and successful RSS feed updates. Enabling this categoty
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// will make you receive rss_alert alerts.
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rss_notification = 0x1000,
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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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ptime 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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// std::auto_ptr<alert> a = ses.pop_alert();
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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.get();
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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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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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// 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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virtual bool discardable() const { return true; }
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#ifndef TORRENT_NO_DEPRECATE
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TORRENT_DEPRECATED_PREFIX
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severity_t severity() const TORRENT_DEPRECATED { return warning; }
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#endif
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// returns a pointer to a copy of the alert.
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virtual std::auto_ptr<alert> clone() const = 0;
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private:
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ptime m_timestamp;
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};
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#ifndef TORRENT_NO_DEPRECATE
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struct TORRENT_EXPORT unhandled_alert : std::exception
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{
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unhandled_alert() {}
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};
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#ifndef BOOST_NO_TYPEID
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namespace detail {
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struct void_;
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template<class Handler
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, BOOST_PP_ENUM_PARAMS(TORRENT_MAX_ALERT_TYPES, class T)>
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void handle_alert_dispatch(
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const std::auto_ptr<alert>& alert_, const Handler& handler
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, const std::type_info& typeid_
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, T0*, BOOST_PP_ENUM_SHIFTED_BINARY_PARAMS(TORRENT_MAX_ALERT_TYPES, T, *p))
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{
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if (typeid_ == typeid(T0))
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handler(*static_cast<T0*>(alert_.get()));
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else
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handle_alert_dispatch(alert_, handler, typeid_
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, BOOST_PP_ENUM_SHIFTED_PARAMS(
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TORRENT_MAX_ALERT_TYPES, p), (void_*)0);
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}
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template<class Handler>
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void handle_alert_dispatch(
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const std::auto_ptr<alert>&
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, const Handler&
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, const std::type_info&
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, BOOST_PP_ENUM_PARAMS(TORRENT_MAX_ALERT_TYPES, void_* BOOST_PP_INTERCEPT))
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{
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throw unhandled_alert();
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}
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} // namespace detail
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template<BOOST_PP_ENUM_PARAMS_WITH_A_DEFAULT(
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TORRENT_MAX_ALERT_TYPES, class T, detail::void_)>
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struct TORRENT_EXPORT handle_alert
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{
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template<class Handler>
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handle_alert(const std::auto_ptr<alert>& alert_
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, const Handler& handler)
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{
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#define ALERT_POINTER_TYPE(z, n, text) (BOOST_PP_CAT(T, n)*)0
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detail::handle_alert_dispatch(alert_, handler, typeid(*alert_)
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, BOOST_PP_ENUM(TORRENT_MAX_ALERT_TYPES, ALERT_POINTER_TYPE, _));
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#undef ALERT_POINTER_TYPE
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}
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};
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#endif // BOOST_NO_TYPEID
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#endif // TORRENT_NO_DEPRECATE
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// When you get an alert, you can use ``alert_cast<>`` to attempt to cast the pointer to a
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// more specific alert type, in order to query it for more information.
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template <class T>
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T* alert_cast(alert* a)
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{
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if (a == 0) return 0;
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if (a->type() == T::alert_type) return static_cast<T*>(a);
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return 0;
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}
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template <class T>
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T const* alert_cast(alert const* a)
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{
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if (a == 0) return 0;
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if (a->type() == T::alert_type) return static_cast<T const*>(a);
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return 0;
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}
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} // namespace libtorrent
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#endif // TORRENT_ALERT_HPP_INCLUDED
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