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deluge/library/pytorrent.py

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#
# Copyright (C) 2006 Alon Zakai ('Kripken') <kripkensteiner@gmail.com>
# Copyright (C) 2006 Zach Tibbitts <zach@collegegeek.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#
# Deluge Library, a.k.a. pytorrent:
#
# Deluge is a client. pytorrent is a Python library for torrenting, that includes
# pytorrent.py, which is Python code, and pytorrent_core, which is also a Python
# module, but written in C++, and includes the libtorrent torrent library. Only
# pytorrent should be visible, and only it should be imported, in the client.
#
import pytorrent_core
import os, shutil
import pickle
import time
# Constants
TORRENTS_SUBDIR = "torrentfiles"
STATE_FILENAME = "persistent.state"
PREFS_FILENAME = "prefs.state"
DHT_FILENAME = "dht.state"
TORRENT_STATE_EXPIRATION = 1 # seconds, like the output of time.time()
DEFAULT_PREFS = {
# "max_half_open" : -1,
"max_uploads" : 2, # a.k.a. upload slots
"listen_on" : [6881,9999],
"max_connections" : 80,
"use_DHT" : True,
"max_active_torrents" : -1,
"auto_seed_ratio" : -1,
"max_download_rate" : -1,
"max_upload_rate" : -1
}
# Exception
class PyTorrentError(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
# Information for a single torrent
class torrent:
def __init__(self, filename, save_dir, compact):
self.filename = filename
self.save_dir = save_dir
self.compact = compact
self.user_paused = False # start out unpaused
self.uploaded_memory = 0
self.filter_out = []
self.delete_me = False # set this to true, to delete it on next sync
# The persistent state of the torrent system. Everything in this will be pickled
class persistent_state:
def __init__(self):
# Torrents
self.torrents = []
# Prepare queue (queue is pickled, just like everything else)
self.queue = [] # queue[x] is the unique_ID of the x-th queue position. Simple.
# The manager for the torrent system
class manager:
def __init__(self, client_ID, version, user_agent, base_dir):
self.base_dir = base_dir
# Ensure directories exist
if not TORRENTS_SUBDIR in os.listdir(self.base_dir):
os.mkdir(self.base_dir + "/" + TORRENTS_SUBDIR)
# Start up the core
assert(len(version) == 4)
pytorrent_core.init(client_ID,
int(version[0]),
int(version[1]),
int(version[2]),
int(version[3]),
user_agent)
self.constants = pytorrent_core.constants()
# Unique IDs are NOT in the state, since they are temporary for each session
self.unique_IDs = {} # unique_ID -> a torrent object
# Saved torrent states. We do not poll the core in a costly manner, necessarily
self.saved_torrent_states = {} # unique_ID -> torrent_state
self.saved_torrent_states_timestamp = {} # time of creation
# Unpickle the preferences, or create a new one
try:
pkl_file = open(self.base_dir + "/" + PREFS_FILENAME, 'rb')
self.prefs = pickle.load(pkl_file)
pkl_file.close()
except IOError:
self.prefs = DEFAULT_PREFS
# Apply preferences. Note that this is before any torrents are added
self.apply_prefs()
# Apply DHT, if needed. Note that this is before any torrents are added
if self.get_pref('use_DHT'):
pytorrent_core.start_DHT(self.base_dir + "/" + DHT_FILENAME)
# Unpickle the state, or create a new one
try:
pkl_file = open(self.base_dir + "/" + STATE_FILENAME, 'rb')
self.state = pickle.load(pkl_file)
pkl_file.close()
# Sync with the core: tell core about torrents, and get unique_IDs
self.sync()
except IOError:
self.state = persistent_state()
def quit(self):
# Pickle the prefs
output = open(self.base_dir + "/" + PREFS_FILENAME, 'wb')
pickle.dump(self.prefs, output)
output.close()
# Pickle the state
output = open(self.base_dir + "/" + STATE_FILENAME, 'wb')
pickle.dump(self.state, output)
output.close()
# Save fastresume data
self.save_fastresume_data()
# Stop DHT, if needed
if self.get_pref('use_DHT'):
pytorrent_core.stop_DHT(self.base_dir + "/" + DHT_FILENAME)
# Shutdown torrent core
pytorrent_core.quit()
def get_pref(self, key):
# If we have a value, return, else fallback on default_prefs, else raise an error
# the fallback is useful if the source has newer prefs than the existing pref state,
# which was created by an old version of the source
if key in self.prefs.keys():
return self.prefs[key]
elif key in DEFAULT_PREFS:
self.prefs[key] = DEFAULT_PREFS[key]
return self.prefs[key]
else:
raise PyTorrentError("Asked for a pref that doesn't exist: " + key)
def set_pref(self, key, value):
# Make sure this is a valid key
if key not in DEFAULT_PREFS.keys():
raise PyTorrentError("Asked to change a pref that isn't valid: " + key)
self.prefs[key] = value
def apply_prefs(self):
print "Applying preferences"
pytorrent_core.set_download_rate_limit(self.get_pref('max_download_rate')*1024)
pytorrent_core.set_upload_rate_limit(self.get_pref('max_upload_rate')*1024)
pytorrent_core.set_listen_on(self.get_pref('listen_on')[0],
self.get_pref('listen_on')[1])
pytorrent_core.set_max_connections(self.get_pref('max_connections'))
pytorrent_core.set_max_uploads(self.get_pref('max_uploads'))
def add_torrent(self, filename, save_dir, compact):
self.add_torrent_ns(filename, save_dir, compact)
return self.sync() # Syncing will create a new torrent in the core, and return it's ID
def remove_torrent(self, unique_ID, data_also):
# Save some data before we remove the torrent, needed later in this func
temp = self.unique_IDs[unique_ID]
temp_fileinfo = pytorrent_core.get_fileinfo(unique_ID)
self.remove_torrent_ns(unique_ID)
self.sync()
# Remove .torrent and .fastresume
os.remove(temp.filename)
try:
# Must be after removal of the torrent, because that saves a new .fastresume
os.remove(temp.filename + ".fastresume")
except OSError:
pass # Perhaps there never was one to begin with
# Remove data, if asked to do so
if data_also:
# Must be done AFTER the torrent is removed
# Note: can this be to the trash?
for filedata in temp_fileinfo:
filename = filedata['path']
try:
os.remove(temp.save_dir + "/" + filename)
except OSError:
pass # No file just means it wasn't downloaded, we can continue
# A separate function, because people may want to call it from time to time
def save_fastresume_data(self):
for unique_ID in self.unique_IDs:
pytorrent_core.save_fastresume(unique_ID, self.unique_IDs[unique_ID].filename)
def get_state(self):
ret = pytorrent_core.get_session_info()
ret['is_listening'] = pytorrent_core.is_listening()
ret['port'] = pytorrent_core.listening_port()
if self.get_pref('use_DHT'):
ret['DHT_nodes'] = pytorrent_core.get_DHT_info()
return ret
# Efficient: use a saved state, if it hasn't expired yet
def get_torrent_state(self, unique_ID, efficiently = False):
if efficiently:
try:
if time.time() < self.saved_torrent_states_timestamp[unique_ID] + \
TORRENT_STATE_EXPIRATION:
return self.saved_torrent_states[unique_ID]
except KeyError:
pass
self.saved_torrent_states_timestamp[unique_ID] = time.time()
self.saved_torrent_states[unique_ID] = pytorrent_core.get_state(unique_ID)
return self.saved_torrent_states[unique_ID]
def mark_state_dirty(self, unique_ID):
del self.saved_torrent_states[unique_ID]
del self.saved_torrent_states_timestamp[unique_ID]
def queue_up(self, unique_ID):
curr_index = self.get_queue_index(unique_ID)
if curr_index > 0:
temp = self.state.queue[curr_index - 1]
self.state.queue[curr_index - 1] = unique_ID
self.state.queue[curr_index] = temp
def queue_down(self, unique_ID):
curr_index = self.get_queue_index(unique_ID)
if curr_index < (len(self.state.queue) - 1):
temp = self.state.queue[curr_index + 1]
self.state.queue[curr_index + 1] = unique_ID
self.state.queue[curr_index] = temp
def queue_bottom(self, unique_ID):
curr_index = self.get_queue_index(unique_ID)
if curr_index < (len(self.state.queue) - 1):
self.state.queue.remove(curr_index)
self.state.queue.append(unique_ID)
def clear_completed(self):
for unique_ID in self.unique_IDs:
torrent_state = self.get_torrent_state(unique_ID, True)
if torrent_state['progress'] == 100.0:
self.remove_torrent_ns(unique_ID)
self.sync()
def set_user_pause(self, unique_ID, new_value):
self.unique_IDs[unique_ID].user_paused = new_value
self.apply_queue()
def is_user_paused(self, unique_ID):
return self.unique_IDs[unique_ID].user_paused
def get_unique_IDs(self):
return self.unique_IDs.keys()
# Enforce the queue: pause/unpause as needed, based on queue and user_pausing
# This should be called after changes to relevant parameters (user_pausing, or
# altering max_active_torrents), or just from time to time
# ___ALL queuing code should be in this function, and ONLY here___
def apply_queue(self):
# Handle autoseeding - downqueue as needed
if self.auto_seed_ratio != -1:
for unique_ID in self.unique_IDs:
if self.get_torrent_state(unique_ID, True)['is_seed']:
torrent_state = self.get_torrent_state(unique_ID, True)
ratio = self.calc_ratio(unique_ID, torrent_state)
if ratio >= self.auto_seed_ratio:
self.queue_bottom(unique_ID)
# Pause and resume torrents
for index in range(len(self.state.queue)):
unique_ID = self.state.queue[index]
if (index < self.state.max_active_torrents or self.state_max_active_torrents == -1) \
and self.get_torrent_state(unique_ID, True)['is_paused'] \
and not self.is_user_paused(unique_ID):
pytorrent_core.resume(unique_ID)
elif not self.get_torrent_state(unique_ID, True)['is_paused'] and \
(index >= self.state.max_active_torrents or self.is_user_paused(unique_ID)):
pytorrent_core.pause(unique_ID)
def calc_ratio(self, unique_ID, torrent_state):
up = float(torrent_state['total_upload'] + self.unique_IDs[unique_ID].uploaded_memory)
down = float(torrent_state["total_done"])
try:
ret = float(up/down)
except:
ret = -1
return ret
def get_num_torrents(self):
return pytorrent_core.get_num_torrents()
def handle_events(self):
event = pytorrent_core.pop_event()
while event is not None:
print "EVENT: ", event
if event['event_type'] is self.constants['EVENT_FINISHED']:
# If we are autoseeding, then we need to apply the queue
if self.auto_seed_ratio == -1:
self.mark_state_dirty(event['unique_ID']) # So the queuing will be to new data
self.apply_queue()
elif event['event_type'] is self.constants['EVENT_PEER_ERROR']:
# self.parent.addMessage(_("Peer Error") + ": " + str(event), "I") # Debug only!
pass
elif event['event_type'] is self.constants['EVENT_INVALID_REQUEST']:
print 'self.parent.addMessage(_("Invalid request") + ": " + str(event), "W") # Maybe "I"?'
elif event['event_type'] is self.constants['EVENT_FILE_ERROR']:
# dc.debugmsg("File error! " + str(event))
print 'self.parent.addMessage(_("File error") + "! " + str(event), "F")'
elif event['event_type'] is self.constants['EVENT_HASH_FAILED_ERROR']:
print 'self.parent.addMessage(_("Hash failed") + ": " + str(event), "I")'
elif event['event_type'] is self.constants['EVENT_PEER_BAN_ERROR']:
print 'self.parent.addMessage(_("Peer banned") + ": " + str(event), "I")'
elif event['event_type'] is self.constants['EVENT_FASTRESUME_REJECTED_ERROR']:
# dc.debugmsg("Fastresume rejected: " + str(event))
print 'self.parent.addMessage(_("Fastresume rejected") + ": " + str(event), "W")'
elif event['event_type'] is self.constants['EVENT_TRACKER']:
print event['tracker_status'], event['message']
elif event['event_type'] is self.constants['EVENT_OTHER']:
print 'self.parent.addMessage(_("Event") + ": " + str(event), "W")'
else:
# dc.debugmsg("Internal error, undefined event type")
# dc.debugmsg("No such event error. Raw data: " + str(event))
print 'self.parent.addMessage(_("Event") + ": " + str(event), "C")'
event = pytorrent_core.pop_event()
####################
# Internal functions
####################
# Non-syncing functions. Used when we loop over such events, and sync manually at the end
def add_torrent_ns(self, filename, save_dir, compact):
# Cache torrent file
(temp, torrent_file_short) = os.path.split(filename)
time.sleep(0.01) # Ensure we use a unique time for the new filename
new_name = str(time.time()) + ".torrent"
full_new_name = self.base_dir + "/" + TORRENTS_SUBDIR + "/" + new_name
if new_name in os.listdir(self.base_dir + "/" + TORRENTS_SUBDIR):
raise PyTorrentError("Could not cache torrent file locally, failed: " + new_name)
shutil.copy(filename, full_new_name)
# Create torrent object
new_torrent = torrent(full_new_name, save_dir, compact)
self.state.torrents.append(new_torrent)
def remove_torrent_ns(self, unique_ID):
self.unique_IDs[unique_ID].delete_me = True
# Sync the state.torrents and unique_IDs lists with the core
# ___ALL syncing code with the core is here, and ONLY here___
# Also all self-syncing is done here (various lists)
def sync(self):
ret = None # We return new added unique ID(s), or None
# Add torrents to core and unique_IDs
torrents_with_unique_ID = self.unique_IDs.values()
for torrent in self.state.torrents:
if torrent not in torrents_with_unique_ID:
# print "Adding torrent to core:", torrent.filename, torrent.save_dir, torrent.compact
unique_ID = pytorrent_core.add_torrent(torrent.filename,
torrent.save_dir,
torrent.compact)
# print "Got unique ID:", unique_ID
ret = unique_ID
self.unique_IDs[unique_ID] = torrent
# Remove torrents from core, unique_IDs and queue
to_delete = []
for torrent in self.state.torrents:
if torrent.delete_me:
pytorrent_core.remove_torrent(torrent.unique_ID, torrent.filename)
to_delete.append(torrent.unique_ID)
for unique_ID in to_delete:
self.state.torrents.remove(self.unique_IDs[unique_ID])
self.state.queue.remove(self.unique_IDs[unique_ID])
del self.unique_IDs[unique_ID]
# Add torrents to queue - at the end, of course
for unique_ID in self.unique_IDs:
if unique_ID not in self.state.queue:
self.state.queue.append(unique_ID)
assert(len(self.unique_IDs) == len(self.state.torrents))
assert(len(self.unique_IDs) == len(self.state.queue))
assert(len(self.unique_IDs) == pytorrent_core.get_num_torrents())
return ret
def get_queue_index(self, unique_ID):
return self.state.queue.index(unique_ID)
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