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more specific exceptions, and change when blobs are deleted

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More specific exceptions are raised when problems are encountered
looking up metadata and validating stream descriptor files, and
on the GUI those more specific exceptions are used to prevent
errors from being presented to the user.

If the user has selected the option to re-upload data for some
stream, blobs downloaded for that purpose will not be deleted
when they are finished being output. Instead, by default, for
the GUI they will be deleted when the stream is removed from
the GUI. That can be changed so they are not deleted at all,
using the lbry.conf file.
This commit is contained in:
Jimmy Kiselak 2015-09-01 17:49:26 -04:00
parent 465a4643a8
commit 192ac6959a
8 changed files with 94 additions and 18 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
lbrynet/core/Error.py
View file

@ -26,11 +26,29 @@ class UnknownNameError(Exception):
def __init__(self, name):
self.name = name
def __str__(self):
return repr(self.name)
class UnknownStreamTypeError(Exception):
def __init__(self, stream_type):
self.stream_type = stream_type
def __str__(self):
return repr(self.stream_type)
class InvalidStreamDescriptorError(Exception):
pass
class InvalidStreamInfoError(Exception):
def __init__(self, name):
self.name = name
def __str__(self):
return repr(self.name)
class MisbehavingPeerError(Exception):
pass

13
lbrynet/core/StreamDescriptor.py
View file

@ -3,6 +3,7 @@ import json
import logging
from twisted.internet import threads
from lbrynet.core.client.StandaloneBlobDownloader import StandaloneBlobDownloader
from lbrynet.core.Error import UnknownStreamTypeError, InvalidStreamDescriptorError
class StreamDescriptorReader(object):
@ -165,19 +166,23 @@ class StreamDescriptorIdentifier(object):
return d
def _get_factories(self, stream_type):
assert stream_type in self._stream_downloader_factories, "Unrecognized stream type: " + str(stream_type)
if not stream_type in self._stream_downloader_factories:
raise UnknownStreamTypeError(stream_type)
return self._stream_downloader_factories[stream_type]
def _get_validator(self, stream_type):
assert stream_type in self._sd_info_validators, "Unrecognized stream type: " + str(stream_type)
if not stream_type in self._stream_downloader_factories:
raise UnknownStreamTypeError(stream_type)
return self._sd_info_validators[stream_type]
def _get_options(self, stream_type):
assert stream_type in self._sd_info_validators, "Unrecognized stream type: " + str(stream_type)
if not stream_type in self._stream_downloader_factories:
raise UnknownStreamTypeError(stream_type)
return self._stream_options[stream_type]
def _return_info_and_factories(self, sd_info):
assert 'stream_type' in sd_info, 'Invalid stream descriptor. No stream_type parameter.'
if not 'stream_type' in sd_info:
raise InvalidStreamDescriptorError('No stream_type parameter in stream descriptor.')
stream_type = sd_info['stream_type']
validator = self._get_validator(stream_type)(sd_info)
factories = [f for f in self._get_factories(stream_type) if f.can_download(validator)]

11
lbrynet/lbryfile/StreamDescriptor.py
View file

@ -3,7 +3,7 @@ import logging
from lbrynet.core.cryptoutils import get_lbry_hash_obj
from lbrynet.cryptstream.CryptBlob import CryptBlobInfo
from twisted.internet import defer
from lbrynet.core.Error import DuplicateStreamHashError
from lbrynet.core.Error import DuplicateStreamHashError, InvalidStreamDescriptorError
LBRYFileStreamType = "lbryfile"
@ -88,11 +88,10 @@ class LBRYFileStreamDescriptorValidator(object):
stream_hash = self.raw_info['stream_hash']
blobs = self.raw_info['blobs']
except KeyError as e:
raise ValueError("Invalid stream descriptor. Missing '%s'" % (e.args[0]))
raise InvalidStreamDescriptorError("Missing '%s'" % (e.args[0]))
for c in hex_suggested_file_name:
if c not in '0123456789abcdef':
raise ValueError("Invalid stream descriptor: "
"suggested file name is not a hex-encoded string")
raise InvalidStreamDescriptorError("Suggested file name is not a hex-encoded string")
h = get_lbry_hash_obj()
h.update(hex_stream_name)
h.update(key)
@ -118,10 +117,10 @@ class LBRYFileStreamDescriptorValidator(object):
for blob in blobs:
blobs_hashsum.update(get_blob_hashsum(blob))
if blobs[-1]['length'] != 0:
raise ValueError("Improperly formed stream descriptor. Must end with a zero-length blob.")
raise InvalidStreamDescriptorError("Does not end with a zero-length blob.")
h.update(blobs_hashsum.digest())
if h.hexdigest() != stream_hash:
raise ValueError("Stream hash does not match stream metadata")
raise InvalidStreamDescriptorError("Stream hash does not match stream metadata")
return defer.succeed(True)
def info_to_show(self):

4
lbrynet/lbryfile/client/LBRYFileDownloader.py
View file

@ -146,7 +146,7 @@ class LBRYFileSaver(LBRYFileDownloader):
def _get_progress_manager(self, download_manager):
return FullStreamProgressManager(self._finished_downloading, self.blob_manager, download_manager,
delete_blob_after_finished=True)
delete_blob_after_finished=not self.upload_allowed)
def _setup_output(self):
def open_file():
@ -216,7 +216,7 @@ class LBRYFileOpener(LBRYFileDownloader):
def _get_progress_manager(self, download_manager):
return FullStreamProgressManager(self._finished_downloading, self.blob_manager, download_manager,
delete_blob_after_finished=True)
delete_blob_after_finished=not self.upload_allowed)
def _setup_output(self):
def start_process():

6
lbrynet/lbrylive/StreamDescriptor.py
View file

@ -2,7 +2,7 @@ import binascii
import logging
from lbrynet.core.cryptoutils import get_lbry_hash_obj, verify_signature
from twisted.internet import defer, threads
from lbrynet.core.Error import DuplicateStreamHashError
from lbrynet.core.Error import DuplicateStreamHashError, InvalidStreamDescriptorError
from lbrynet.lbrylive.LiveBlob import LiveBlobInfo
from lbrynet.interfaces import IStreamDescriptorValidator
from zope.interface import implements
@ -98,7 +98,7 @@ class LBRYLiveStreamDescriptorValidator(object):
h.update(public_key)
h.update(key)
if h.hexdigest() != stream_hash:
raise ValueError("Stream hash does not match stream metadata")
raise InvalidStreamDescriptorError("Stream hash does not match stream metadata")
blobs = self.raw_info['blobs']
def check_blob_signatures():
@ -121,7 +121,7 @@ class LBRYLiveStreamDescriptorValidator(object):
hashsum.update(iv)
hashsum.update(str(length))
if not verify_signature(hashsum.digest(), signature, public_key):
raise ValueError("Invalid signature in stream descriptor")
raise InvalidStreamDescriptorError("Invalid signature in stream descriptor")
return threads.deferToThread(check_blob_signatures)

45
lbrynet/lbrynet_downloader_gui/LBRYDownloader.py
View file

@ -4,6 +4,8 @@ import tkMessageBox
from Crypto import Random
from lbrynet.conf import MIN_BLOB_DATA_PAYMENT_RATE
from lbrynet.core import StreamDescriptor
from lbrynet.core.Error import UnknownNameError, UnknownStreamTypeError, InvalidStreamDescriptorError
from lbrynet.core.Error import InvalidStreamInfoError
from lbrynet.core.LBRYcrdWallet import LBRYcrdWallet
from lbrynet.core.PaymentRateManager import PaymentRateManager
from lbrynet.core.Session import LBRYSession
@ -46,6 +48,7 @@ class LBRYDownloader(object):
self.default_blob_data_payment_rate = MIN_BLOB_DATA_PAYMENT_RATE
self.use_upnp = False
self.start_lbrycrdd = True
self.delete_blobs_on_remove = True
self.blob_request_payment_rate_manager = None
def start(self):
@ -175,6 +178,13 @@ class LBRYDownloader(object):
elif field_name == "download_directory":
logging.debug("Setting download_directory to %s", str(field_value))
self.download_directory = field_value
elif field_name == "delete_blobs_on_stream_remove":
if field_value.lower() == "true":
self.delete_blobs_on_remove = True
elif field_value.lower() == "false":
self.delete_blobs_on_remove = False
else:
raise ValueError("delete_blobs_on_stream_remove must be set to True or False")
else:
logging.warning("Got unknown configuration field: %s", field_name)
@ -312,7 +322,7 @@ class LBRYDownloader(object):
def get_sd_hash(value):
if 'stream_hash' in value:
return value['stream_hash']
raise ValueError("Invalid stream")
raise UnknownNameError(uri)
def get_sd_blob(sd_hash):
stream_frame.show_metadata_status("name resolved, fetching metadata...")
@ -393,6 +403,7 @@ class LBRYDownloader(object):
return arg
def start_download(downloader):
stream_frame.stream_hash = downloader.stream_hash
l = task.LoopingCall(show_stream_status, downloader)
l.start(1)
d = downloader.start()
@ -424,8 +435,38 @@ class LBRYDownloader(object):
logging.error(err.getErrorMessage())
stream_frame.show_download_done(payment_rate_manager.points_paid)
resolve_d.addErrback(lambda err: err.trap(defer.CancelledError))
resolve_d.addErrback(lambda err: err.trap(defer.CancelledError, UnknownNameError,
UnknownStreamTypeError, InvalidStreamDescriptorError,
InvalidStreamInfoError))
resolve_d.addErrback(show_err)
def delete_associated_blobs():
if stream_frame.stream_hash is None or self.delete_blobs_on_remove is False:
return defer.succeed(True)
d1 = self.stream_info_manager.get_blobs_for_stream(stream_frame.stream_hash)
def get_blob_hashes(blob_infos):
return [b[0] for b in blob_infos if b[0] is not None]
d1.addCallback(get_blob_hashes)
d2 = self.stream_info_manager.get_sd_blob_hashes_for_stream(stream_frame.stream_hash)
def combine_blob_hashes(results):
blob_hashes = []
for success, result in results:
if success is True:
blob_hashes.extend(result)
return blob_hashes
def delete_blobs(blob_hashes):
return self.session.blob_manager.delete_blobs(blob_hashes)
dl = defer.DeferredList([d1, d2], fireOnOneErrback=True)
dl.addCallback(combine_blob_hashes)
dl.addCallback(delete_blobs)
return dl
resolve_d.addCallback(lambda _: delete_associated_blobs())
self._add_download_deferred(resolve_d, stream_frame)
def _add_download_deferred(self, d, stream_frame):

1
lbrynet/lbrynet_downloader_gui/StreamFrame.py
View file

@ -10,6 +10,7 @@ class StreamFrame(object):
def __init__(self, app, uri):
self.app = app
self.uri = uri
self.stream_hash = None
self.cancel_func = None
self.stream_frame = ttk.Frame(self.app.streams_frame, style="B.TFrame")

14
lbrynet/lbrynet_downloader_gui/lbry.conf
View file

@ -94,4 +94,16 @@
# to download encrypted chunks of data from this application,
# if this application is acting as a server.
#
# peer_port = 3333
# peer_port = 3333
# ===== delete_blobs_on_stream_remove =====
# If this is set to True, all blobs associated with the stream
# will be deleted when the stream is removed from the GUI,
# whether by clicking the 'x' or by closing the application.
# If this is set to False, they will not be deleted then.
# However, they may be deleted otherwise. For example if the
# option to allow reuploading is set to False, they will be
# deleted as soon as they're outputted by the application.
#
# delete_blobs_on_stream_remove = True