refactor lbrynet.core.StreamDescriptor
-remove lbrynet/lbry_file/StreamDescriptor.py
This commit is contained in:
Jack Robison
parent
0b1f4192fc
commit
f8c33b6acb
3 changed files with 215 additions and 190 deletions
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@ -1,7 +1,11 @@
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import os
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import binascii
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from collections import defaultdict
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from collections import defaultdict
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import json
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import json
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import logging
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import logging
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from twisted.internet import threads, defer
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from twisted.internet import threads, defer
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from lbrynet.core.cryptoutils import get_lbry_hash_obj
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from lbrynet.core.client.StandaloneBlobDownloader import StandaloneBlobDownloader
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from lbrynet.core.client.StandaloneBlobDownloader import StandaloneBlobDownloader
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from lbrynet.core.Error import UnknownStreamTypeError, InvalidStreamDescriptorError
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from lbrynet.core.Error import UnknownStreamTypeError, InvalidStreamDescriptorError
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@ -87,7 +91,7 @@ class PlainStreamDescriptorWriter(StreamDescriptorWriter):
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def _write_stream_descriptor(self, raw_data):
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def _write_stream_descriptor(self, raw_data):
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def write_file():
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def write_file():
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log.debug("Writing the sd file to disk")
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log.info("Writing the sd file to disk")
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with open(self.sd_file_name, 'w') as sd_file:
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with open(self.sd_file_name, 'w') as sd_file:
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sd_file.write(raw_data)
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sd_file.write(raw_data)
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return self.sd_file_name
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return self.sd_file_name
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@ -98,7 +102,6 @@ class PlainStreamDescriptorWriter(StreamDescriptorWriter):
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class BlobStreamDescriptorWriter(StreamDescriptorWriter):
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class BlobStreamDescriptorWriter(StreamDescriptorWriter):
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def __init__(self, blob_manager):
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def __init__(self, blob_manager):
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StreamDescriptorWriter.__init__(self)
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StreamDescriptorWriter.__init__(self)
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self.blob_manager = blob_manager
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self.blob_manager = blob_manager
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@defer.inlineCallbacks
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@defer.inlineCallbacks
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@ -239,6 +242,208 @@ class StreamDescriptorIdentifier(object):
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return d
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return d
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EncryptedFileStreamType = "lbryfile"
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@defer.inlineCallbacks
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def save_sd_info(blob_manager, sd_hash, sd_info):
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if not blob_manager.blobs.get(sd_hash) or not blob_manager.blobs[sd_hash].get_is_verified():
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descriptor_writer = BlobStreamDescriptorWriter(blob_manager)
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calculated_sd_hash = yield descriptor_writer.create_descriptor(sd_info)
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if calculated_sd_hash != sd_hash:
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raise InvalidStreamDescriptorError("%s does not match calculated %s" %
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(sd_hash, calculated_sd_hash))
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stream_hash = yield blob_manager.storage.get_stream_hash_for_sd_hash(sd_hash)
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if not stream_hash:
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log.debug("Saving info for %s", sd_info['stream_name'].decode('hex'))
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stream_name = sd_info['stream_name']
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key = sd_info['key']
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stream_hash = sd_info['stream_hash']
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stream_blobs = sd_info['blobs']
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suggested_file_name = sd_info['suggested_file_name']
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yield blob_manager.storage.add_known_blobs(stream_blobs)
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yield blob_manager.storage.store_stream(
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stream_hash, sd_hash, stream_name, key, suggested_file_name, stream_blobs
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)
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defer.returnValue(stream_hash)
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def format_blobs(crypt_blob_infos):
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formatted_blobs = []
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for blob_info in crypt_blob_infos:
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blob = {}
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if blob_info.length != 0:
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blob['blob_hash'] = str(blob_info.blob_hash)
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blob['blob_num'] = blob_info.blob_num
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blob['iv'] = str(blob_info.iv)
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blob['length'] = blob_info.length
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formatted_blobs.append(blob)
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return formatted_blobs
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def format_sd_info(stream_type, stream_name, key, suggested_file_name, stream_hash, blobs):
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return {
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"stream_type": stream_type,
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"stream_name": stream_name,
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"key": key,
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"suggested_file_name": suggested_file_name,
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"stream_hash": stream_hash,
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"blobs": blobs
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}
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@defer.inlineCallbacks
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def get_sd_info(storage, stream_hash, include_blobs):
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"""
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Get an sd info dictionary from storage
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:param storage: (SQLiteStorage) storage instance
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:param stream_hash: (str) stream hash
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:param include_blobs: (bool) include stream blob infos
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:return: {
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"stream_type": "lbryfile",
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"stream_name": <hex encoded stream name>,
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"key": <stream key>,
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"suggested_file_name": <hex encoded suggested file name>,
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"stream_hash": <stream hash>,
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"blobs": [
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{
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"blob_hash": <head blob_hash>,
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"blob_num": 0,
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"iv": <iv>,
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"length": <head blob length>
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}, ...
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{
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"blob_num": <stream length>,
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"iv": <iv>,
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"length": 0
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}
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]
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}
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"""
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stream_info = yield storage.get_stream_info(stream_hash)
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blobs = []
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if include_blobs:
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blobs = yield storage.get_blobs_for_stream(stream_hash)
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defer.returnValue(
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format_sd_info(
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EncryptedFileStreamType, stream_info[0], stream_info[1],
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stream_info[2], stream_hash, format_blobs(blobs)
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)
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)
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@defer.inlineCallbacks
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def create_plain_sd(storage, stream_hash, file_name, overwrite_existing=False):
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def _get_file_name():
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actual_file_name = file_name
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if os.path.exists(actual_file_name):
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ext_num = 1
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while os.path.exists(actual_file_name + "_" + str(ext_num)):
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ext_num += 1
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actual_file_name = actual_file_name + "_" + str(ext_num)
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return actual_file_name
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if overwrite_existing is False:
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file_name = yield threads.deferToThread(_get_file_name())
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descriptor_writer = PlainStreamDescriptorWriter(file_name)
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sd_info = yield get_sd_info(storage, stream_hash, True)
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sd_hash = yield descriptor_writer.create_descriptor(sd_info)
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defer.returnValue(sd_hash)
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def get_blob_hashsum(b):
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length = b['length']
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if length != 0:
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blob_hash = b['blob_hash']
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else:
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blob_hash = None
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blob_num = b['blob_num']
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iv = b['iv']
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blob_hashsum = get_lbry_hash_obj()
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if length != 0:
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blob_hashsum.update(blob_hash)
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blob_hashsum.update(str(blob_num))
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blob_hashsum.update(iv)
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blob_hashsum.update(str(length))
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return blob_hashsum.digest()
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def get_stream_hash(hex_stream_name, key, hex_suggested_file_name, blob_infos):
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h = get_lbry_hash_obj()
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h.update(hex_stream_name)
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h.update(key)
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h.update(hex_suggested_file_name)
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blobs_hashsum = get_lbry_hash_obj()
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sorted_blob_infos = sorted(blob_infos, key=lambda x: x['blob_num'])
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for blob in sorted_blob_infos:
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blobs_hashsum.update(get_blob_hashsum(blob))
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if sorted_blob_infos[-1]['length'] != 0:
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raise InvalidStreamDescriptorError("Does not end with a zero-length blob.")
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if 'blob_hash' in sorted_blob_infos[-1]:
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raise InvalidStreamDescriptorError("Stream terminator blob should not have a hash")
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h.update(blobs_hashsum.digest())
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return h.hexdigest()
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def verify_hex(text, field_name):
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for c in text:
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if c not in '0123456789abcdef':
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raise InvalidStreamDescriptorError("%s is not a hex-encoded string" % field_name)
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def validate_descriptor(stream_info):
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try:
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hex_stream_name = stream_info['stream_name']
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key = stream_info['key']
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hex_suggested_file_name = stream_info['suggested_file_name']
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stream_hash = stream_info['stream_hash']
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blobs = stream_info['blobs']
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except KeyError as e:
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raise InvalidStreamDescriptorError("Missing '%s'" % (e.args[0]))
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verify_hex(key, "key")
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verify_hex(hex_suggested_file_name, "suggested file name")
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verify_hex(stream_hash, "stream_hash")
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calculated_stream_hash = get_stream_hash(
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hex_stream_name, key, hex_suggested_file_name, blobs
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)
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if calculated_stream_hash != stream_hash:
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raise InvalidStreamDescriptorError("Stream hash does not match stream metadata")
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return True
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class EncryptedFileStreamDescriptorValidator(object):
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def __init__(self, raw_info):
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self.raw_info = raw_info
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def validate(self):
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return defer.succeed(validate_descriptor(self.raw_info))
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def info_to_show(self):
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info = []
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info.append(("stream_name", binascii.unhexlify(self.raw_info.get("stream_name"))))
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size_so_far = 0
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for blob_info in self.raw_info.get("blobs", []):
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size_so_far += int(blob_info['length'])
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info.append(("stream_size", str(self.get_length_of_stream())))
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suggested_file_name = self.raw_info.get("suggested_file_name", None)
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if suggested_file_name is not None:
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suggested_file_name = binascii.unhexlify(suggested_file_name)
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info.append(("suggested_file_name", suggested_file_name))
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return info
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def get_length_of_stream(self):
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size_so_far = 0
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for blob_info in self.raw_info.get("blobs", []):
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size_so_far += int(blob_info['length'])
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return size_so_far
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@defer.inlineCallbacks
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def download_sd_blob(session, blob_hash, payment_rate_manager, timeout=None):
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def download_sd_blob(session, blob_hash, payment_rate_manager, timeout=None):
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"""
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"""
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Downloads a single blob from the network
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Downloads a single blob from the network
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@ -251,6 +456,7 @@ def download_sd_blob(session, blob_hash, payment_rate_manager, timeout=None):
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@return: An object of type HashBlob
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@return: An object of type HashBlob
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"""
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"""
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downloader = StandaloneBlobDownloader(blob_hash,
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downloader = StandaloneBlobDownloader(blob_hash,
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session.blob_manager,
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session.blob_manager,
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session.peer_finder,
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session.peer_finder,
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@ -258,4 +464,10 @@ def download_sd_blob(session, blob_hash, payment_rate_manager, timeout=None):
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payment_rate_manager,
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payment_rate_manager,
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session.wallet,
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session.wallet,
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timeout)
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timeout)
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return downloader.download()
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sd_blob = yield downloader.download()
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sd_reader = BlobStreamDescriptorReader(sd_blob)
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sd_info = yield sd_reader.get_info()
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raw_sd = yield sd_reader._get_raw_data()
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yield session.blob_manager.storage.add_known_blob(blob_hash, len(raw_sd))
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yield save_sd_info(session.blob_manager, sd_blob.blob_hash, sd_info)
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defer.returnValue(sd_blob)
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@ -1,185 +0,0 @@
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import binascii
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import logging
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from lbrynet.core.cryptoutils import get_lbry_hash_obj
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from lbrynet.cryptstream.CryptBlob import CryptBlobInfo
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from twisted.internet import defer, threads
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from lbrynet.core.Error import DuplicateStreamHashError, InvalidStreamDescriptorError
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from lbrynet.core.StreamDescriptor import PlainStreamDescriptorWriter, BlobStreamDescriptorWriter
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import os
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log = logging.getLogger(__name__)
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EncryptedFileStreamType = "lbryfile"
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def save_sd_info(stream_info_manager, sd_info, ignore_duplicate=False):
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log.debug("Saving info for %s", str(sd_info['stream_name']))
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hex_stream_name = sd_info['stream_name']
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key = sd_info['key']
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stream_hash = sd_info['stream_hash']
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raw_blobs = sd_info['blobs']
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suggested_file_name = sd_info['suggested_file_name']
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crypt_blobs = []
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for blob in raw_blobs:
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length = blob['length']
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if length != 0:
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blob_hash = blob['blob_hash']
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else:
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blob_hash = None
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blob_num = blob['blob_num']
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iv = blob['iv']
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crypt_blobs.append(CryptBlobInfo(blob_hash, blob_num, length, iv))
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log.debug("Trying to save stream info for %s", str(hex_stream_name))
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d = stream_info_manager.save_stream(stream_hash, hex_stream_name, key,
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suggested_file_name, crypt_blobs)
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def check_if_duplicate(err):
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if ignore_duplicate is True:
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err.trap(DuplicateStreamHashError)
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d.addErrback(check_if_duplicate)
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d.addCallback(lambda _: stream_hash)
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return d
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def get_sd_info(stream_info_manager, stream_hash, include_blobs):
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d = stream_info_manager.get_stream_info(stream_hash)
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def format_info(stream_info):
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fields = {}
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fields['stream_type'] = EncryptedFileStreamType
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fields['stream_name'] = stream_info[1]
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fields['key'] = stream_info[0]
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fields['suggested_file_name'] = stream_info[2]
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fields['stream_hash'] = stream_hash
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def format_blobs(blobs):
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formatted_blobs = []
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for blob_hash, blob_num, iv, length in blobs:
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blob = {}
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if length != 0:
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blob['blob_hash'] = blob_hash
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blob['blob_num'] = blob_num
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blob['iv'] = iv
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blob['length'] = length
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formatted_blobs.append(blob)
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fields['blobs'] = formatted_blobs
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return fields
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if include_blobs is True:
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d = stream_info_manager.get_blobs_for_stream(stream_hash)
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else:
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d = defer.succeed([])
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d.addCallback(format_blobs)
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return d
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d.addCallback(format_info)
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return d
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@defer.inlineCallbacks
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def publish_sd_blob(stream_info_manager, blob_manager, stream_hash):
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descriptor_writer = BlobStreamDescriptorWriter(blob_manager)
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sd_info = yield get_sd_info(stream_info_manager, stream_hash, True)
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sd_blob_hash = yield descriptor_writer.create_descriptor(sd_info)
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yield stream_info_manager.save_sd_blob_hash_to_stream(stream_hash, sd_blob_hash)
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defer.returnValue(sd_blob_hash)
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def create_plain_sd(stream_info_manager, stream_hash, file_name, overwrite_existing=False):
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def _get_file_name():
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actual_file_name = file_name
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if os.path.exists(actual_file_name):
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ext_num = 1
|
|
||||||
while os.path.exists(actual_file_name + "_" + str(ext_num)):
|
|
||||||
ext_num += 1
|
|
||||||
actual_file_name = actual_file_name + "_" + str(ext_num)
|
|
||||||
return actual_file_name
|
|
||||||
|
|
||||||
if overwrite_existing is False:
|
|
||||||
d = threads.deferToThread(_get_file_name())
|
|
||||||
else:
|
|
||||||
d = defer.succeed(file_name)
|
|
||||||
|
|
||||||
def do_create(file_name):
|
|
||||||
descriptor_writer = PlainStreamDescriptorWriter(file_name)
|
|
||||||
d = get_sd_info(stream_info_manager, stream_hash, True)
|
|
||||||
d.addCallback(descriptor_writer.create_descriptor)
|
|
||||||
return d
|
|
||||||
|
|
||||||
d.addCallback(do_create)
|
|
||||||
return d
|
|
||||||
|
|
||||||
|
|
||||||
class EncryptedFileStreamDescriptorValidator(object):
|
|
||||||
def __init__(self, raw_info):
|
|
||||||
self.raw_info = raw_info
|
|
||||||
|
|
||||||
def validate(self):
|
|
||||||
log.debug("Trying to validate stream descriptor for %s", str(self.raw_info['stream_name']))
|
|
||||||
try:
|
|
||||||
hex_stream_name = self.raw_info['stream_name']
|
|
||||||
key = self.raw_info['key']
|
|
||||||
hex_suggested_file_name = self.raw_info['suggested_file_name']
|
|
||||||
stream_hash = self.raw_info['stream_hash']
|
|
||||||
blobs = self.raw_info['blobs']
|
|
||||||
except KeyError as e:
|
|
||||||
raise InvalidStreamDescriptorError("Missing '%s'" % (e.args[0]))
|
|
||||||
for c in hex_suggested_file_name:
|
|
||||||
if c not in '0123456789abcdef':
|
|
||||||
raise InvalidStreamDescriptorError(
|
|
||||||
"Suggested file name is not a hex-encoded string")
|
|
||||||
h = get_lbry_hash_obj()
|
|
||||||
h.update(hex_stream_name)
|
|
||||||
h.update(key)
|
|
||||||
h.update(hex_suggested_file_name)
|
|
||||||
|
|
||||||
def get_blob_hashsum(b):
|
|
||||||
length = b['length']
|
|
||||||
if length != 0:
|
|
||||||
blob_hash = b['blob_hash']
|
|
||||||
else:
|
|
||||||
blob_hash = None
|
|
||||||
blob_num = b['blob_num']
|
|
||||||
iv = b['iv']
|
|
||||||
blob_hashsum = get_lbry_hash_obj()
|
|
||||||
if length != 0:
|
|
||||||
blob_hashsum.update(blob_hash)
|
|
||||||
blob_hashsum.update(str(blob_num))
|
|
||||||
blob_hashsum.update(iv)
|
|
||||||
blob_hashsum.update(str(length))
|
|
||||||
return blob_hashsum.digest()
|
|
||||||
|
|
||||||
blobs_hashsum = get_lbry_hash_obj()
|
|
||||||
for blob in blobs:
|
|
||||||
blobs_hashsum.update(get_blob_hashsum(blob))
|
|
||||||
if blobs[-1]['length'] != 0:
|
|
||||||
raise InvalidStreamDescriptorError("Does not end with a zero-length blob.")
|
|
||||||
h.update(blobs_hashsum.digest())
|
|
||||||
if h.hexdigest() != stream_hash:
|
|
||||||
raise InvalidStreamDescriptorError("Stream hash does not match stream metadata")
|
|
||||||
log.debug("It is validated")
|
|
||||||
return defer.succeed(True)
|
|
||||||
|
|
||||||
def info_to_show(self):
|
|
||||||
info = []
|
|
||||||
info.append(("stream_name", binascii.unhexlify(self.raw_info.get("stream_name"))))
|
|
||||||
size_so_far = 0
|
|
||||||
for blob_info in self.raw_info.get("blobs", []):
|
|
||||||
size_so_far += int(blob_info['length'])
|
|
||||||
info.append(("stream_size", str(self.get_length_of_stream())))
|
|
||||||
suggested_file_name = self.raw_info.get("suggested_file_name", None)
|
|
||||||
if suggested_file_name is not None:
|
|
||||||
suggested_file_name = binascii.unhexlify(suggested_file_name)
|
|
||||||
info.append(("suggested_file_name", suggested_file_name))
|
|
||||||
return info
|
|
||||||
|
|
||||||
def get_length_of_stream(self):
|
|
||||||
size_so_far = 0
|
|
||||||
for blob_info in self.raw_info.get("blobs", []):
|
|
||||||
size_so_far += int(blob_info['length'])
|
|
||||||
return size_so_far
|
|
||||||
|
|
@ -1,2 +0,0 @@
|
||||||
from lbrynet.lbry_file.StreamDescriptor import get_sd_info
|
|
||||||
from lbrynet.lbry_file.StreamDescriptor import publish_sd_blob
|
|
||||||
Loading…
Reference in a new issue