mirror of
https://github.com/tahoe-lafs/tahoe-lafs.git
synced 2025-02-02 09:17:59 +00:00
124 lines
3.4 KiB
Python
124 lines
3.4 KiB
Python
"""
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Ported to Python 3.
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"""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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from future.utils import PY2
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if PY2:
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from future.builtins import filter, map, zip, ascii, chr, hex, input, next, oct, open, pow, round, super, bytes, dict, list, object, range, str, max, min # noqa: F401
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from io import BytesIO
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from zope.interface import implementer
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from twisted.internet import defer
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from twisted.protocols import basic
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from allmydata.interfaces import IImmutableFileNode, ICheckable
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from allmydata.uri import LiteralFileURI
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@implementer(IImmutableFileNode, ICheckable)
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class _ImmutableFileNodeBase(object):
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def get_write_uri(self):
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return None
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def get_readonly_uri(self):
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return self.get_uri()
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def is_mutable(self):
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return False
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def is_readonly(self):
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return True
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def is_unknown(self):
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return False
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def is_allowed_in_immutable_directory(self):
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return True
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def raise_error(self):
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pass
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def __hash__(self):
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return self.u.__hash__()
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def __eq__(self, other):
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if isinstance(other, _ImmutableFileNodeBase):
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return self.u == other.u
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else:
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return False
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def __ne__(self, other):
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return not self == other
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class LiteralFileNode(_ImmutableFileNodeBase):
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def __init__(self, filecap):
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assert isinstance(filecap, LiteralFileURI)
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self.u = filecap
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def get_size(self):
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return len(self.u.data)
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def get_current_size(self):
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return defer.succeed(self.get_size())
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def get_cap(self):
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return self.u
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def get_readcap(self):
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return self.u
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def get_verify_cap(self):
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return None
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def get_repair_cap(self):
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return None
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def get_uri(self):
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return self.u.to_string()
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def get_storage_index(self):
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return None
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def check(self, monitor, verify=False, add_lease=False):
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return defer.succeed(None)
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def check_and_repair(self, monitor, verify=False, add_lease=False):
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return defer.succeed(None)
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def read(self, consumer, offset=0, size=None):
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if size is None:
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data = self.u.data[offset:]
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else:
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data = self.u.data[offset:offset+size]
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# We use twisted.protocols.basic.FileSender, which only does
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# non-streaming, i.e. PullProducer, where the receiver/consumer must
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# ask explicitly for each chunk of data. There are only two places in
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# the Twisted codebase that can't handle streaming=False, both of
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# which are in the upload path for an FTP/SFTP server
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# (protocols.ftp.FileConsumer and
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# vfs.adapters.ftp._FileToConsumerAdapter), neither of which is
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# likely to be used as the target for a Tahoe download.
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d = basic.FileSender().beginFileTransfer(BytesIO(data), consumer)
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d.addCallback(lambda lastSent: consumer)
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return d
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# IReadable, IFileNode, IFilesystemNode
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def get_best_readable_version(self):
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return defer.succeed(self)
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def download_best_version(self, progress=None):
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if progress is not None:
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progress.set_progress_total(len(self.u.data))
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progress.set_progress(len(self.u.data))
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return defer.succeed(self.u.data)
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download_to_data = download_best_version
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get_size_of_best_version = get_current_size
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