extend the tutorial
This commit is contained in:
arvidn
parent
13e9eb6680
commit
c919c63ca3
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@ -91,6 +91,9 @@ script:
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- cd ../examples
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- bjam --hash -j3 warnings-as-errors=on variant=$variant $toolset link=shared
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- if [[ lang == "cpp11" ]]; then
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bjam --hash -j3 warnings-as-errors=on variant=$variant $toolset link=shared bt-get bt-get2;
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fi
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- cd ..
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# build libtorrent separately and install it in a temporary (well known) dir
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@ -117,6 +117,9 @@ build_script:
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- if not defined x64 (
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cd %ROOT_DIRECTORY%\examples
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& b2.exe --hash -j2 %compiler% variant=%variant% linkflags=%linkflags% include=%include% link=shared
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& if %compiler% == msvc-14.0 ( b2.exe --hash -j2 %compiler% variant=%variant% linkflags=%linkflags% include=%include% link=shared bt-get bt-get2 )
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& cd %ROOT_DIRECTORY%\examples
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& b2.exe --hash -j2 %compiler% variant=%variant% linkflags=%linkflags% include=%include% link=shared
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& cd %ROOT_DIRECTORY%\bindings\python
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& b2.exe --hash -j2 %compiler% stage_module install-dependencies=on variant=%variant% libtorrent-link=shared linkflags=%linkflags% include=%include%
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& python test.py
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@ -29,7 +29,7 @@ For example:
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#include <libtorrent/session.hpp>
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#include <libtorrent/add_torrent_params.hpp>
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#include <libtorrent/torrent_handle.hpp>
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namespace lt = libtorrent;
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int main(int argc, char const* argv[])
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{
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@ -70,46 +70,165 @@ completes downloading, we can poll the session for alerts periodically and print
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them out, as well as listening for the torrent_finished_alert_, which is posted
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when a torrent completes.
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.. include:: ../examples/bt-get.cpp
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:code: c++
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:tab-width: 2
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:start-after: */
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alert masks
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-----------
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The output from this program will be quite verbose, which is probably a good
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starting point to get some understanding of what's going on. Alerts are
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categorized into alert categories. Each category can be enabled and disabled
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independently via the *alert mask*.
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The alert mask is a configuration option offered by libtorrent. There are many
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configuration options, see settings_pack_. The alert_mask_ setting is an integer
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of the `category flags`_ ORed together.
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For instance, to only see the most pertinent alerts, the session can be
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constructed like this:
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.. code:: c++
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#include <iostream>
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#include <libtorrent/session.hpp>
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#include <libtorrent/add_torrent_params.hpp>
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#include <libtorrent/torrent_handle.hpp>
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#include <libtorrent/alert_types.hpp>
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namespace lt = libtorrent;
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int main(int argc, char const* argv[])
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lt::settings_pack pack;
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pack.set_int(lt::settings_pack::alert_mask
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, lt::alert::error_notification
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| lt::alert::storage_notification
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| lt::alert::status_notification);
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lt::session ses(pack);
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Configuration options can be updated after the session is started by calling
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`apply_settings()`_. Some settings are best set before starting the session
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though, like listen_interfaces_, to avoid race conditions. If you start the
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session with the default settings and then immediately change them, there will
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still be a window where the default settings apply.
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Changing the settings may trigger listen sockets to close and re-open and
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NAT-PMP, UPnP updates to be sent. For this reason, it's typically a good idea
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to batch settings updates into a single call.
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session destruction
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-------------------
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The session destructor is blocking by default. When shutting down, trackers
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will need to be contacted to stop torrents and other outstanding operations
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need to be cancelled. Shutting down can sometimes take several seconds,
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primarily because of trackers that are unresponsive (and time out) and also
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DNS servers that are unresponsive. DNS lookups are especially difficult to
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abort when stalled.
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In order to be able to start destruction an wait for it asynchronously, one
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can call `session::abort()`_.
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This call returns a session_proxy_ object, which is a handle keeping the session
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state alive while destructing it. It deliberately does not provide any of the
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session operations, since it's shutting down.
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After having a session_proxy_ object, the session destructor does not block.
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However, the session_proxy_ destructor *will*.
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This can be used to shut down multiple sessions or other parts of the
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application in parallel.
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asynchronous operations
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-----------------------
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Essentially any call to a member function of session_ or torrent_handle_ that
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returns a value is a blocking synchronous call. Meaning it will post a message
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to the main libtorrent thread and wait for a response. Such calls may be
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expensive, and in applications where stalls should be avoided (such as user
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interface threads), blocking calls should be avoided.
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In the example above, session::add_torrent() returns a torrent_handle_ and is
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thus blocking. For higher efficiency, `async_add_torrent()`_ will post a message
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to the main thread to add a torrent, and post the resulting torrent_handle_ back
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in an alert (add_torrent_alert_). This is especially useful when adding a lot
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of torrents in quick succession, as there's no stall in between calls.
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In the example above, we don't actually use the torrent_handle_ for anything, so
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converting it to use `async_add_torrent()`_ is just a matter of replacing the
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`add_torrent()`_ call with `async_add_torrent()`_.
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torrent_status_updates
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----------------------
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To get updates to the status of torrents, call `post_torrent_updates()`_ on the
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session object. This will cause libtorrent to post a state_update_alert_
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containing torrent_status_ objects for all torrents whose status has *changed*
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since the last call to `post_torrent_updates()`_.
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The state_update_alert_ looks something like this:
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.. code:: c++
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struct state_update_alert : alert
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{
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if (argc != 2) {
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std::cerr << "usage: " << argv[0] << " <magnet-url>" << std::endl;
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return 1;
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}
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lt::session ses;
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virtual std::string message() const;
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std::vector<torrent_status> status;
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};
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lt::add_torrent_params atp;
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atp.url = argv[1];
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atp.save_path = "."; // save in current dir
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lt::torrent_handle h = ses.add_torrent(atp);
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The ``status`` field only contains the torrent_status_ for torrents with
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updates since the last call. It may be empty if no torrent has updated its
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state. This feature is critical for scalability_.
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bool done = false;
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while (!done) {
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std::vector<lt::alert*> alerts;
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ses.pop_alerts(&alerts);
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See the torrent_status_ object for more information on what is in there.
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Perhaps the most interesting fields are ``total_payload_download``,
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``total_payload_upload``, ``num_peers`` and ``state``.
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for (lt::alert const* a : alerts) {
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std::cout << a->message() << std::endl;
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if (lt::alert_cast<lt::torrent_finished_alert>(a)) {
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done = true;
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}
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}
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}
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}
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resuming torrents
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-----------------
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*TODO* cover async_add_torrent()
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*TODO* cover post_torrent_updates()
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*TODO* cover save_resume_data()
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Since bittorrent downloads pieces of files in random order, it's not trivial to
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resume a partial download. When resuming a download, the bittorrent engine must
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restore the state of the downloading torrent, specifically, which parts of the
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file(s) are downloaded. There are two approaches to doing this:
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1. read every piece of the downloaded files from disk and compare it against the
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expected hash.
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2. save to disk the state of which pieces (and partial pieces) are downloaded,
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and load it back in again when resuming.
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If no resume data is provided with a torrent that's added, libtorrent will
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employ (1) by default.
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To save resume data, call `save_resume_data()`_ on the torrent_handle_ object.
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This will ask libtorrent to generate the resume data and post it back in
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a save_resume_data_alert_. If generating the resume data fails for any reason,
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a save_resume_data_failed_alert_ is posted instead. Exactly one of those alerts
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will be posted for every call to `save_resume_data()`_.
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The save_resume_data_alert_ looks something like this:
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.. code:: c++
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struct save_resume_data_alert : torrent_alert
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{
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virtual std::string message() const;
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// points to the resume data.
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boost::shared_ptr<entry> resume_data;
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};
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``resume_data`` points to an entry_ object. This represents a node or a tree
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of nodes in a bencoded_ structure, which is the native encoding scheme in
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bittorrent. It can be encoded into a byte buffer or file using `bencode()`_.
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example
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-------
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Here's an updated version of the above example with the following updates:
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1. not using blocking calls
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2. printing torrent status updates rather than the raw log
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3. saving and loading resume files
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.. include:: ../examples/bt-get2.cpp
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:code: c++
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:tab-width: 2
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:start-after: */
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.. _session: reference-Core.html#session
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.. _session_handle: reference-Core.html#session_handle
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@ -121,5 +240,22 @@ when a torrent completes.
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.. _`alert`: reference-Alerts.html#alert
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.. _`alert_cast<>`: reference-Alerts.html#alert_cast()
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.. _torrent_finished_alert: reference-Alerts.html#torrent-finished-alert
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.. _listen_interfaces: reference-Settings.html#listen_interfaces
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.. _`add_torrent_alert`: reference-Alerts.html#add-torrent-alert
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.. _settings_pack: reference-Settings.html#settings_pack
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.. _alert_mask: reference-Settings.html#alert_mask
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.. _`category flags`: reference-Alerts.html#category_t
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.. _`apply_settings()`: reference-Core.html#apply_settings()
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.. _`session::abort()`: reference-Core.html#abort()
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.. _session_proxy: reference-Core.html#session_proxy
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.. _`post_torrent_updates()`: reference-Core.html#post_torrent_updates()
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.. _torrent_status: reference-Core.html#torrent_status
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.. _state_update_alert: reference-Alerts.html#state_update_alert
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.. _scalability: http://blog.libtorrent.org/2011/11/scalable-interfaces/
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.. _`save_resume_data()`: reference-Core.html#save_resume_data()
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.. _save_resume_data_alert: reference-Alerts.html#save_resume_data_alert
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.. _save_resume_data_failed_alert: reference-Alerts.html#save_resume_data_failed_alert
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.. _bencoded: https://en.wikipedia.org/wiki/Bencode
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.. _entry: reference-Bencoding.html#entry
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.. _`bencode()`: reference-Bencoding.html#bencode()
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@ -20,6 +20,8 @@ project client_test
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exe client_test : client_test.cpp print.cpp torrent_view.cpp session_view.cpp ;
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exe simple_client : simple_client.cpp ;
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exe bt-get : bt-get.cpp ;
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exe bt-get2 : bt-get2.cpp ;
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exe stats_counters : stats_counters.cpp ;
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exe dump_torrent : dump_torrent.cpp ;
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exe make_torrent : make_torrent.cpp ;
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@ -28,6 +30,8 @@ exe upnp_test : upnp_test.cpp ;
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explicit stage_client_test ;
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explicit stage_connection_tester ;
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explicit bt-get ;
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explicit bt-get2 ;
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install stage_client_test : client_test : <location>. ;
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install stage_connection_tester : connection_tester : <location>. ;
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@ -5,6 +5,8 @@ example_programs = \
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make_torrent \
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simple_client \
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upnp_test \
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bt_get \
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bt_get2 \
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connection_tester
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if ENABLE_EXAMPLES
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@ -15,25 +17,14 @@ EXTRA_PROGRAMS = $(example_programs)
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EXTRA_DIST = Jamfile CMakeLists.txt run_cmake.sh.in cmake/FindLibtorrentRasterbar.cmake
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client_test_SOURCES = client_test.cpp print.cpp session_view.cpp torrent_view.cpp
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#client_test_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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stats_counters_SOURCES = stats_counters.cpp
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#stats_counters_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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bt_get_SOURCES = bt-get.cpp
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bt_get2_SOURCES = bt-get2.cpp
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dump_torrent_SOURCES = dump_torrent.cpp
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#dump_torrent_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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make_torrent_SOURCES = make_torrent.cpp
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#make_torrent_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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simple_client_SOURCES = simple_client.cpp
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#simple_client_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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connection_tester_SOURCES = connection_tester.cpp
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#connection_tester_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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upnp_test_SOURCES = upnp_test.cpp
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#upnp_test_LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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LDADD = $(top_builddir)/src/libtorrent-rasterbar.la
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@ -0,0 +1,75 @@
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/*
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Copyright (c) 2016, Arvid Norberg
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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:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in
|
||||
the documentation and/or other materials provided with the distribution.
|
||||
* Neither the name of the author nor the names of its
|
||||
contributors may be used to endorse or promote products derived
|
||||
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
|
||||
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
|
||||
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGE.
|
||||
|
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*/
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#include <iostream>
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#include <thread>
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#include <chrono>
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#include <libtorrent/session.hpp>
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#include <libtorrent/add_torrent_params.hpp>
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#include <libtorrent/torrent_handle.hpp>
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#include <libtorrent/alert_types.hpp>
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namespace lt = libtorrent;
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int main(int argc, char const* argv[])
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{
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if (argc != 2) {
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std::cerr << "usage: " << argv[0] << " <magnet-url>" << std::endl;
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return 1;
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}
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lt::session ses;
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lt::add_torrent_params atp;
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atp.url = argv[1];
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atp.save_path = "."; // save in current dir
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lt::torrent_handle h = ses.add_torrent(atp);
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for (;;) {
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std::vector<lt::alert*> alerts;
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ses.pop_alerts(&alerts);
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for (lt::alert const* a : alerts) {
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std::cout << a->message() << std::endl;
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// if we receive the finished alert or an error, we're done
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if (lt::alert_cast<lt::torrent_finished_alert>(a)) {
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goto done;
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}
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if (lt::alert_cast<lt::torrent_error_alert>(a)) {
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goto done;
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}
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}
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std::this_thread::sleep_for(std::chrono::milliseconds(200));
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}
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done:
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std::cout << "done, shutting down" << std::endl;
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}
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@ -0,0 +1,142 @@
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/*
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Copyright (c) 2016, Arvid Norberg
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All rights reserved.
|
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|
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Redistribution and use in source and binary forms, with or without
|
||||
modification, are permitted provided that the following conditions
|
||||
are met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
notice, this list of conditions and the following disclaimer.
|
||||
* Redistributions in binary form must reproduce the above copyright
|
||||
notice, this list of conditions and the following disclaimer in
|
||||
the documentation and/or other materials provided with the distribution.
|
||||
* Neither the name of the author nor the names of its
|
||||
contributors may be used to endorse or promote products derived
|
||||
from this software without specific prior written permission.
|
||||
|
||||
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||||
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||||
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||||
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||||
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||||
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||||
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||||
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
*/
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|
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#include <iostream>
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#include <thread>
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#include <chrono>
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#include <fstream>
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#include <libtorrent/session.hpp>
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#include <libtorrent/add_torrent_params.hpp>
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#include <libtorrent/torrent_handle.hpp>
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#include <libtorrent/alert_types.hpp>
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#include <libtorrent/bencode.hpp>
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#include <libtorrent/torrent_status.hpp>
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namespace lt = libtorrent;
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// return the name of a torrent status enum
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char const* state(lt::torrent_status::state_t s)
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{
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switch(s)
|
||||
{
|
||||
case lt::torrent_status::checking_files: return "checking";
|
||||
case lt::torrent_status::downloading_metadata: return "dl metadata";
|
||||
case lt::torrent_status::downloading: return "downloading";
|
||||
case lt::torrent_status::finished: return "finished";
|
||||
case lt::torrent_status::seeding: return "seeding";
|
||||
case lt::torrent_status::allocating: return "allocating";
|
||||
case lt::torrent_status::checking_resume_data: return "checking resume";
|
||||
default: return "<>";
|
||||
}
|
||||
}
|
||||
|
||||
int main(int argc, char const* argv[])
|
||||
{
|
||||
if (argc != 2) {
|
||||
std::cerr << "usage: " << argv[0] << " <magnet-url>" << std::endl;
|
||||
return 1;
|
||||
}
|
||||
|
||||
lt::settings_pack pack;
|
||||
pack.set_int(lt::settings_pack::alert_mask
|
||||
, lt::alert::error_notification
|
||||
| lt::alert::storage_notification
|
||||
| lt::alert::status_notification);
|
||||
|
||||
lt::session ses(pack);
|
||||
|
||||
lt::add_torrent_params atp;
|
||||
|
||||
// load resume data from disk and pass it in as we add the magnet link
|
||||
std::ifstream ifs(".resume_file", std::ios_base::binary);
|
||||
ifs.unsetf(std::ios_base::skipws);
|
||||
atp.resume_data.assign(std::istream_iterator<char>(ifs)
|
||||
, std::istream_iterator<char>());
|
||||
atp.url = argv[1];
|
||||
atp.save_path = "."; // save in current dir
|
||||
ses.async_add_torrent(atp);
|
||||
|
||||
// this is the handle we'll set once we get the notification of it being
|
||||
// added
|
||||
lt::torrent_handle h;
|
||||
for (;;) {
|
||||
std::vector<lt::alert*> alerts;
|
||||
ses.pop_alerts(&alerts);
|
||||
|
||||
for (lt::alert const* a : alerts) {
|
||||
if (auto at = lt::alert_cast<lt::add_torrent_alert>(a)) {
|
||||
h = at->handle;
|
||||
}
|
||||
// if we receive the finished alert or an error, we're done
|
||||
if (lt::alert_cast<lt::torrent_finished_alert>(a)) {
|
||||
h.save_resume_data();
|
||||
goto done;
|
||||
}
|
||||
if (lt::alert_cast<lt::torrent_error_alert>(a)) {
|
||||
std::cout << a->message() << std::endl;
|
||||
goto done;
|
||||
}
|
||||
|
||||
// when resume data is ready, save it
|
||||
if (auto rd = lt::alert_cast<lt::save_resume_data_alert>(a)) {
|
||||
std::ofstream of(".resume_file", std::ios_base::binary);
|
||||
of.unsetf(std::ios_base::skipws);
|
||||
lt::bencode(std::ostream_iterator<char>(of)
|
||||
, *rd->resume_data);
|
||||
}
|
||||
|
||||
if (auto st = lt::alert_cast<lt::state_update_alert>(a)) {
|
||||
if (st->status.empty()) continue;
|
||||
|
||||
// we only have a single torrent, so we know which one
|
||||
// the status is for
|
||||
lt::torrent_status const& s = st->status[0];
|
||||
std::cout << "\r" << state(s.state) << " "
|
||||
<< (s.download_payload_rate / 1000) << " kB/s "
|
||||
<< (s.total_done / 1000) << " kB ("
|
||||
<< (s.progress_ppm / 10000) << "%) downloaded\x1b[K";
|
||||
std::cout.flush();
|
||||
}
|
||||
}
|
||||
std::this_thread::sleep_for(std::chrono::milliseconds(200));
|
||||
|
||||
// ask the session to post a state_update_alert, to update our
|
||||
// state output for the torrent
|
||||
ses.post_torrent_updates();
|
||||
|
||||
// TODO: 3 call save_resume_data() once every 30 seconds or so
|
||||
}
|
||||
done:
|
||||
std::cout << "\ndone, shutting down" << std::endl;
|
||||
}
|
||||
|
||||
|
|
@ -1942,8 +1942,7 @@ namespace libtorrent
|
|||
|
||||
TORRENT_DEFINE_ALERT(dht_error_alert, 73)
|
||||
|
||||
static const int static_category = alert::error_notification
|
||||
| alert::dht_notification;
|
||||
static const int static_category = alert::error_notification | alert::dht_notification;
|
||||
virtual std::string message() const TORRENT_OVERRIDE;
|
||||
|
||||
// the error code
|
||||
|
|
|
|||
|
|
@ -662,9 +662,8 @@ namespace libtorrent
|
|||
only_if_modified = 4
|
||||
};
|
||||
|
||||
// ``save_resume_data()`` generates fast-resume data and returns it as an
|
||||
// entry. This entry is suitable for being bencoded. For more information
|
||||
// about how fast-resume works, see fast-resume_.
|
||||
// ``save_resume_data()`` asks libtorrent to generate fast-resume data for
|
||||
// this torrent.
|
||||
//
|
||||
// The ``flags`` argument is a bitmask of flags ORed together. see
|
||||
// save_resume_flags_t
|
||||
|
|
@ -676,9 +675,7 @@ namespace libtorrent
|
|||
// The fast resume data will be empty in the following cases:
|
||||
//
|
||||
// 1. The torrent handle is invalid.
|
||||
// 2. The torrent is checking (or is queued for checking) its storage, it
|
||||
// will obviously not be ready to write resume data.
|
||||
// 3. The torrent hasn't received valid metadata and was started without
|
||||
// 2. The torrent hasn't received valid metadata and was started without
|
||||
// metadata (see libtorrent's metadata-from-peers_ extension)
|
||||
//
|
||||
// Note that by the time you receive the fast resume data, it may already
|
||||
|
|
|
|||
Loading…
Reference in New Issue