220 lines
9.3 KiB
Python
220 lines
9.3 KiB
Python
import base64
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import struct
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from typing import List
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from binascii import hexlify
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from itertools import chain
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from lbry.error import ResolveCensoredError
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from lbry.schema.types.v2.result_pb2 import Outputs as OutputsMessage
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from lbry.schema.types.v2.result_pb2 import Error as ErrorMessage
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INVALID = ErrorMessage.Code.Name(ErrorMessage.INVALID)
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NOT_FOUND = ErrorMessage.Code.Name(ErrorMessage.NOT_FOUND)
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BLOCKED = ErrorMessage.Code.Name(ErrorMessage.BLOCKED)
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def set_reference(reference, claim_hash, rows):
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if claim_hash:
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for txo in rows:
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if claim_hash == txo['claim_hash']:
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reference.tx_hash = txo['txo_hash'][:32]
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reference.nout = struct.unpack('<I', txo['txo_hash'][32:])[0]
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reference.height = txo['height']
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return
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class Censor:
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__slots__ = 'streams', 'channels', 'limit_claims_per_channel', 'censored', 'claims_in_channel', 'total'
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def __init__(self, streams: dict = None, channels: dict = None, limit_claims_per_channel: int = None):
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self.streams = streams or {}
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self.channels = channels or {}
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self.limit_claims_per_channel = limit_claims_per_channel # doesn't count as censored
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self.censored = {}
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self.claims_in_channel = {}
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self.total = 0
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def censor(self, row) -> bool:
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was_censored = False
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for claim_hash, lookup in (
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(row['claim_hash'], self.streams),
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(row['claim_hash'], self.channels),
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(row['channel_hash'], self.channels),
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(row['reposted_claim_hash'], self.streams),
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(row['reposted_claim_hash'], self.channels)):
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censoring_channel_hash = lookup.get(claim_hash)
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if censoring_channel_hash:
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was_censored = True
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self.censored.setdefault(censoring_channel_hash, 0)
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self.censored[censoring_channel_hash] += 1
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break
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if was_censored:
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self.total += 1
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if not was_censored and self.limit_claims_per_channel is not None and row['channel_hash']:
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if row['channel_hash'] not in self.claims_in_channel:
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self.claims_in_channel[row['channel_hash']] = 1
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else:
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self.claims_in_channel[row['channel_hash']] += 1
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if self.claims_in_channel[row['channel_hash']] > self.limit_claims_per_channel:
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return True
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return was_censored
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def to_message(self, outputs: OutputsMessage, extra_txo_rows):
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outputs.blocked_total = self.total
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for censoring_channel_hash, count in self.censored.items():
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blocked = outputs.blocked.add()
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blocked.count = count
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set_reference(blocked.channel, censoring_channel_hash, extra_txo_rows)
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class Outputs:
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__slots__ = 'txos', 'extra_txos', 'txs', 'offset', 'total', 'blocked', 'blocked_total'
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def __init__(self, txos: List, extra_txos: List, txs: set,
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offset: int, total: int, blocked: List, blocked_total: int):
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self.txos = txos
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self.txs = txs
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self.extra_txos = extra_txos
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self.offset = offset
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self.total = total
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self.blocked = blocked
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self.blocked_total = blocked_total
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def inflate(self, txs):
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tx_map = {tx.hash: tx for tx in txs}
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for txo_message in self.extra_txos:
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self.message_to_txo(txo_message, tx_map)
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txos = [self.message_to_txo(txo_message, tx_map) for txo_message in self.txos]
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return txos, self.inflate_blocked(tx_map)
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def inflate_blocked(self, tx_map):
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return {
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"total": self.blocked_total,
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"channels": [{
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'channel': self.message_to_txo(blocked.channel, tx_map),
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'blocked': blocked.count
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} for blocked in self.blocked]
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}
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def message_to_txo(self, txo_message, tx_map):
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if txo_message.WhichOneof('meta') == 'error':
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error = {
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'error': {
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'name': txo_message.error.Code.Name(txo_message.error.code),
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'text': txo_message.error.text,
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}
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}
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if error['error']['name'] == BLOCKED:
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error['error']['censor'] = self.message_to_txo(
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txo_message.error.blocked.channel, tx_map
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)
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return error
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tx = tx_map.get(txo_message.tx_hash)
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if not tx:
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return
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txo = tx.outputs[txo_message.nout]
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if txo_message.WhichOneof('meta') == 'claim':
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claim = txo_message.claim
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txo.meta = {
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'short_url': f'lbry://{claim.short_url}',
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'canonical_url': f'lbry://{claim.canonical_url or claim.short_url}',
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'reposted': claim.reposted,
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'is_controlling': claim.is_controlling,
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'take_over_height': claim.take_over_height,
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'creation_height': claim.creation_height,
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'activation_height': claim.activation_height,
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'expiration_height': claim.expiration_height,
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'effective_amount': claim.effective_amount,
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'support_amount': claim.support_amount,
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'trending_group': claim.trending_group,
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'trending_mixed': claim.trending_mixed,
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'trending_local': claim.trending_local,
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'trending_global': claim.trending_global,
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}
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if claim.HasField('channel'):
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txo.channel = tx_map[claim.channel.tx_hash].outputs[claim.channel.nout]
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if claim.HasField('repost'):
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txo.reposted_claim = tx_map[claim.repost.tx_hash].outputs[claim.repost.nout]
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try:
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if txo.claim.is_channel:
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txo.meta['claims_in_channel'] = claim.claims_in_channel
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except:
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pass
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return txo
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@classmethod
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def from_base64(cls, data: str) -> 'Outputs':
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return cls.from_bytes(base64.b64decode(data))
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@classmethod
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def from_bytes(cls, data: bytes) -> 'Outputs':
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outputs = OutputsMessage()
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outputs.ParseFromString(data)
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txs = set()
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for txo_message in chain(outputs.txos, outputs.extra_txos):
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if txo_message.WhichOneof('meta') == 'error':
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continue
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txs.add((hexlify(txo_message.tx_hash[::-1]).decode(), txo_message.height))
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return cls(
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outputs.txos, outputs.extra_txos, txs,
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outputs.offset, outputs.total,
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outputs.blocked, outputs.blocked_total
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)
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@classmethod
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def to_base64(cls, txo_rows, extra_txo_rows, offset=0, total=None, blocked=None) -> str:
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return base64.b64encode(cls.to_bytes(txo_rows, extra_txo_rows, offset, total, blocked)).decode()
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@classmethod
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def to_bytes(cls, txo_rows, extra_txo_rows, offset=0, total=None, blocked: Censor = None) -> bytes:
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page = OutputsMessage()
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page.offset = offset
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if total is not None:
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page.total = total
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if blocked is not None:
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blocked.to_message(page, extra_txo_rows)
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for row in txo_rows:
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cls.row_to_message(row, page.txos.add(), extra_txo_rows)
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for row in extra_txo_rows:
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cls.row_to_message(row, page.extra_txos.add(), extra_txo_rows)
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return page.SerializeToString()
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@classmethod
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def row_to_message(cls, txo, txo_message, extra_txo_rows):
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if isinstance(txo, Exception):
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txo_message.error.text = txo.args[0]
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if isinstance(txo, ValueError):
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txo_message.error.code = ErrorMessage.INVALID
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elif isinstance(txo, LookupError):
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txo_message.error.code = ErrorMessage.NOT_FOUND
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elif isinstance(txo, ResolveCensoredError):
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txo_message.error.code = ErrorMessage.BLOCKED
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set_reference(txo_message.error.blocked.channel, txo.censor_hash, extra_txo_rows)
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return
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txo_message.tx_hash = txo['txo_hash'][:32]
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txo_message.nout, = struct.unpack('<I', txo['txo_hash'][32:])
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txo_message.height = txo['height']
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txo_message.claim.short_url = txo['short_url']
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txo_message.claim.reposted = txo['reposted']
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if txo['canonical_url'] is not None:
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txo_message.claim.canonical_url = txo['canonical_url']
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txo_message.claim.is_controlling = bool(txo['is_controlling'])
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if txo['last_take_over_height'] is not None:
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txo_message.claim.take_over_height = txo['last_take_over_height']
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txo_message.claim.creation_height = txo['creation_height']
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txo_message.claim.activation_height = txo['activation_height']
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txo_message.claim.expiration_height = txo['expiration_height']
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if txo['claims_in_channel'] is not None:
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txo_message.claim.claims_in_channel = txo['claims_in_channel']
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txo_message.claim.effective_amount = txo['effective_amount']
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txo_message.claim.support_amount = txo['support_amount']
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txo_message.claim.trending_group = txo['trending_group']
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txo_message.claim.trending_mixed = txo['trending_mixed']
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txo_message.claim.trending_local = txo['trending_local']
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txo_message.claim.trending_global = txo['trending_global']
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set_reference(txo_message.claim.channel, txo['channel_hash'], extra_txo_rows)
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set_reference(txo_message.claim.repost, txo['reposted_claim_hash'], extra_txo_rows)
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