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# The contents of this file are subject to the BitTorrent Open Source License
# Version 1.1 (the License). You may not copy or use this file, in either
# source code or executable form, except in compliance with the License. You
# may obtain a copy of the License at http://www.bittorrent.com/license/.
#
# Software distributed under the License is distributed on an AS IS basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
# Written by Bram Cohen
import os
from bisect import bisect_right
from array import array
from BitTorrent.obsoletepythonsupport import *
from BitTorrent import BTFailure, app_name
class FilePool(object):
def __init__(self, max_files_open):
self.allfiles = {}
self.handlebuffer = None
self.handles = {}
self.whandles = {}
self.set_max_files_open(max_files_open)
def close_all(self):
failures = {}
for filename, handle in self.handles.iteritems():
try:
handle.close()
except Exception, e:
failures[self.allfiles[filename]] = e
self.handles.clear()
self.whandles.clear()
if self.handlebuffer is not None:
del self.handlebuffer[:]
for torrent, e in failures.iteritems():
torrent.got_exception(e)
def set_max_files_open(self, max_files_open):
if max_files_open <= 0:
max_files_open = 1e100
self.max_files_open = max_files_open
self.close_all()
if len(self.allfiles) > self.max_files_open:
self.handlebuffer = []
else:
self.handlebuffer = None
def add_files(self, files, torrent):
for filename in files:
if filename in self.allfiles:
raise BTFailure(_("File %s belongs to another running torrent")
% filename)
for filename in files:
self.allfiles[filename] = torrent
if self.handlebuffer is None and \
len(self.allfiles) > self.max_files_open:
self.handlebuffer = self.handles.keys()
def remove_files(self, files):
for filename in files:
del self.allfiles[filename]
if self.handlebuffer is not None and \
len(self.allfiles) <= self.max_files_open:
self.handlebuffer = None
# Make this a separate function because having this code in Storage.__init__()
# would make python print a SyntaxWarning (uses builtin 'file' before 'global')
def bad_libc_workaround():
global file
def file(name, mode = 'r', buffering = None):
return open(name, mode)
class Storage(object):
def __init__(self, config, filepool, files, check_only=False):
self.filepool = filepool
self.config = config
self.ranges = []
self.myfiles = {}
self.tops = {}
self.undownloaded = {}
self.unallocated = {}
total = 0
for filename, length in files:
self.unallocated[filename] = length
self.undownloaded[filename] = length
if length > 0:
self.ranges.append((total, total + length, filename))
self.myfiles[filename] = None
total += length
if os.path.exists(filename):
if not os.path.isfile(filename):
raise BTFailure(_("File %s already exists, but is not a "
"regular file") % filename)
l = os.path.getsize(filename)
if l > length and not check_only:
h = file(filename, 'rb+')
h.truncate(length)
h.close()
l = length
self.tops[filename] = l
elif not check_only:
f = os.path.split(filename)[0]
if f != '' and not os.path.exists(f):
os.makedirs(f)
file(filename, 'wb').close()
self.begins = [i[0] for i in self.ranges]
self.total_length = total
if check_only:
return
self.handles = filepool.handles
self.whandles = filepool.whandles
# Rather implement this as an ugly hack here than change all the
# individual calls. Affects all torrent instances using this module.
if config['bad_libc_workaround']:
bad_libc_workaround()
def was_preallocated(self, pos, length):
for filename, begin, end in self._intervals(pos, length):
if self.tops.get(filename, 0) < end:
return False
return True
def get_total_length(self):
return self.total_length
def _intervals(self, pos, amount):
r = []
stop = pos + amount
p = bisect_right(self.begins, pos) - 1
while p < len(self.ranges) and self.ranges[p][0] < stop:
begin, end, filename = self.ranges[p]
r.append((filename, max(pos, begin) - begin, min(end, stop) - begin))
p += 1
return r
def _get_file_handle(self, filename, for_write):
handlebuffer = self.filepool.handlebuffer
if filename in self.handles:
if for_write and filename not in self.whandles:
self.handles[filename].close()
self.handles[filename] = file(filename, 'rb+', 0)
self.whandles[filename] = None
if handlebuffer is not None and handlebuffer[-1] != filename:
handlebuffer.remove(filename)
handlebuffer.append(filename)
else:
if for_write:
self.handles[filename] = file(filename, 'rb+', 0)
self.whandles[filename] = None
else:
self.handles[filename] = file(filename, 'rb', 0)
if handlebuffer is not None:
if len(handlebuffer) >= self.filepool.max_files_open:
oldfile = handlebuffer.pop(0)
if oldfile in self.whandles: # .pop() in python 2.3
del self.whandles[oldfile]
self.handles[oldfile].close()
del self.handles[oldfile]
handlebuffer.append(filename)
return self.handles[filename]
def read(self, pos, amount):
r = []
for filename, pos, end in self._intervals(pos, amount):
h = self._get_file_handle(filename, False)
h.seek(pos)
r.append(h.read(end - pos))
r = ''.join(r)
if len(r) != amount:
raise BTFailure(_("Short read - something truncated files?"))
return r
def write(self, pos, s):
# might raise an IOError
total = 0
for filename, begin, end in self._intervals(pos, len(s)):
h = self._get_file_handle(filename, True)
h.seek(begin)
h.write(s[total: total + end - begin])
total += end - begin
def close(self):
error = None
for filename in self.handles.keys():
if filename in self.myfiles:
try:
self.handles[filename].close()
except Exception, e:
error = e
del self.handles[filename]
if filename in self.whandles:
del self.whandles[filename]
handlebuffer = self.filepool.handlebuffer
if handlebuffer is not None:
handlebuffer = [f for f in handlebuffer if f not in self.myfiles]
self.filepool.handlebuffer = handlebuffer
if error is not None:
raise error
def write_fastresume(self, resumefile, amount_done):
resumefile.write('BitTorrent resume state file, version 1\n')
resumefile.write(str(amount_done) + '\n')
for x, x, filename in self.ranges:
resumefile.write(str(os.path.getsize(filename)) + ' ' +
str(os.path.getmtime(filename)) + '\n')
def check_fastresume(self, resumefile, return_filelist=False,
piece_size=None, numpieces=None, allfiles=None):
filenames = [name for x, x, name in self.ranges]
if resumefile is not None:
version = resumefile.readline()
if version != 'BitTorrent resume state file, version 1\n':
raise BTFailure(_("Unsupported fastresume file format, "
"maybe from another client version?"))
amount_done = int(resumefile.readline())
else:
amount_done = size = mtime = 0
for filename in filenames:
if resumefile is not None:
line = resumefile.readline()
size, mtime = line.split()[:2] # allow adding extra fields
size = int(size)
mtime = int(mtime)
if os.path.exists(filename):
fsize = os.path.getsize(filename)
else:
raise BTFailure(_("Another program appears to have moved, renamed, or deleted the file, "
"or %s may have crashed last time it was run.") % app_name)
if fsize > 0 and mtime != os.path.getmtime(filename):
raise BTFailure(_("Another program appears to have modified the file, "
"or %s may have crashed last time it was run.") % app_name)
if size != fsize:
raise BTFailure(_("Another program appears to have changed the file size, "
"or %s may have crashed last time it was run.") % app_name)
if not return_filelist:
return amount_done
if resumefile is None:
return None
if numpieces < 32768:
typecode = 'h'
else:
typecode = 'l'
try:
r = array(typecode)
r.fromfile(resumefile, numpieces)
except Exception, e:
raise BTFailure(_("Couldn't read fastresume data: ") + str(e) + '.')
for i in range(numpieces):
if r[i] >= 0:
# last piece goes "past the end", doesn't matter
self.downloaded(r[i] * piece_size, piece_size)
if r[i] != -2:
self.allocated(i * piece_size, piece_size)
undl = self.undownloaded
unal = self.unallocated
return amount_done, [undl[x] for x in allfiles], \
[not unal[x] for x in allfiles]
def allocated(self, pos, length):
for filename, begin, end in self._intervals(pos, length):
self.unallocated[filename] -= end - begin
def downloaded(self, pos, length):
for filename, begin, end in self._intervals(pos, length):
self.undownloaded[filename] -= end - begin
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