import math import unicodedata as uda from binascii import unhexlify, hexlify from torba.rpc.jsonrpc import RPCError from torba.server.hash import hash_to_hex_str from torba.server.session import ElectrumX from torba.server import util from lbrynet.schema.uri import parse_lbry_uri, CLAIM_ID_MAX_LENGTH, URIParseError from lbrynet.wallet.server.block_processor import LBRYBlockProcessor from lbrynet.wallet.server.db import LBRYDB class LBRYElectrumX(ElectrumX): PROTOCOL_MIN = (0, 0) # temporary, for supporting 0.10 protocol max_errors = math.inf # don't disconnect people for errors! let them happen... def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) # fixme: this is a rebase hack, we need to go through ChainState instead later self.daemon = self.session_mgr.daemon self.bp: LBRYBlockProcessor = self.session_mgr.bp self.db: LBRYDB = self.bp.db # fixme: lbryum specific subscribe self.subscribe_height = False def set_request_handlers(self, ptuple): super().set_request_handlers(ptuple) handlers = { 'blockchain.transaction.get_height': self.transaction_get_height, 'blockchain.claimtrie.getclaimbyid': self.claimtrie_getclaimbyid, 'blockchain.claimtrie.getclaimsforname': self.claimtrie_getclaimsforname, 'blockchain.claimtrie.getclaimsbyids': self.claimtrie_getclaimsbyids, 'blockchain.claimtrie.getvalue': self.claimtrie_getvalue, 'blockchain.claimtrie.getnthclaimforname': self.claimtrie_getnthclaimforname, 'blockchain.claimtrie.getclaimsintx': self.claimtrie_getclaimsintx, 'blockchain.claimtrie.getclaimssignedby': self.claimtrie_getclaimssignedby, 'blockchain.claimtrie.getclaimssignedbynthtoname': self.claimtrie_getclaimssignedbynthtoname, 'blockchain.claimtrie.getvalueforuri': self.claimtrie_getvalueforuri, 'blockchain.claimtrie.getvaluesforuris': self.claimtrie_getvalueforuris, 'blockchain.claimtrie.getclaimssignedbyid': self.claimtrie_getclaimssignedbyid, 'blockchain.block.get_server_height': self.get_server_height, 'blockchain.block.get_block': self.get_block, } # fixme: methods we use but shouldnt be using anymore. To be removed when torba goes out handlers.update({ 'blockchain.numblocks.subscribe': self.numblocks_subscribe, 'blockchain.utxo.get_address': self.utxo_get_address, 'blockchain.transaction.broadcast': self.transaction_broadcast_1_0, 'blockchain.transaction.get': self.transaction_get, }) self.request_handlers.update(handlers) async def utxo_get_address(self, tx_hash, index): # fixme: lbryum # Used only for electrum client command-line requests. We no # longer index by address, so need to request the raw # transaction. So it works for any TXO not just UTXOs. self.assert_tx_hash(tx_hash) try: index = int(index) if index < 0: raise ValueError except ValueError: raise RPCError(1, "index has to be >= 0 and integer") raw_tx = await self.daemon_request('getrawtransaction', tx_hash) if not raw_tx: return None raw_tx = util.hex_to_bytes(raw_tx) tx = self.coin.DESERIALIZER(raw_tx).read_tx() if index >= len(tx.outputs): return None return self.coin.address_from_script(tx.outputs[index].pk_script) async def transaction_broadcast_1_0(self, raw_tx): # fixme: lbryum # An ugly API: current Electrum clients only pass the raw # transaction in hex and expect error messages to be returned in # the result field. And the server shouldn't be doing the client's # user interface job here. try: return await self.transaction_broadcast(raw_tx) except RPCError as e: return e.message async def numblocks_subscribe(self): # fixme workaround for lbryum '''Subscribe to get height of new blocks.''' self.subscribe_height = True return self.bp.height async def notify(self, height, touched): # fixme workaround for lbryum await super().notify(height, touched) if self.subscribe_height and height != self.notified_height: self.send_notification('blockchain.numblocks.subscribe', (height,)) async def transaction_get(self, tx_hash, verbose=False): # fixme: workaround for lbryum sending the height instead of True/False. # fixme: lbryum_server ignored that and always used False, but this is out of spec if verbose not in (True, False): verbose = False return await self.daemon_request('getrawtransaction', tx_hash, verbose) async def get_block(self, block_hash): return await self.daemon.deserialised_block(block_hash) async def get_server_height(self): return self.bp.height async def transaction_get_height(self, tx_hash): self.assert_tx_hash(tx_hash) transaction_info = await self.daemon.getrawtransaction(tx_hash, True) if transaction_info and 'hex' in transaction_info and 'confirmations' in transaction_info: # an unconfirmed transaction from lbrycrdd will not have a 'confirmations' field height = self.db.db_height height = height - transaction_info['confirmations'] return height elif transaction_info and 'hex' in transaction_info: return -1 return None async def claimtrie_getclaimssignedby(self, name): winning_claim = await self.daemon.getvalueforname(name) if winning_claim: return await self.claimtrie_getclaimssignedbyid(winning_claim['claimId']) async def claimtrie_getclaimssignedbyid(self, certificate_id): claim_ids = self.get_claim_ids_signed_by(certificate_id) return await self.batched_formatted_claims_from_daemon(claim_ids) def claimtrie_getclaimssignedbyidminimal(self, certificate_id): claim_ids = self.get_claim_ids_signed_by(certificate_id) ret = [] for claim_id in claim_ids: raw_claim_id = unhexlify(claim_id)[::-1] info = self.db.get_claim_info(raw_claim_id) if info: ret.append({ 'claim_id': claim_id, 'height': info.height, 'name': info.name.decode() }) return ret def get_claim_ids_signed_by(self, certificate_id): raw_certificate_id = unhexlify(certificate_id)[::-1] raw_claim_ids = self.db.get_signed_claim_ids_by_cert_id(raw_certificate_id) return list(map(hash_to_hex_str, raw_claim_ids)) async def claimtrie_getclaimssignedbynthtoname(self, name, n): claim = self.claimtrie_getnthclaimforname(name, n) if claim and 'claim_id' in claim: return await self.claimtrie_getclaimssignedbyid(hash_to_hex_str(claim['claim_id'])) async def claimtrie_getclaimsintx(self, txid): # TODO: this needs further discussion. # Code on lbryum-server is wrong and we need to gather what we clearly expect from this command claim_ids = [claim['claimId'] for claim in (await self.daemon.getclaimsfortx(txid)) if 'claimId' in claim] return await self.batched_formatted_claims_from_daemon(claim_ids) async def claimtrie_getvalue(self, name, block_hash=None): proof = await self.daemon.getnameproof(name, block_hash) result = {'proof': proof, 'supports': []} if proof_has_winning_claim(proof): tx_hash, nout = proof['txhash'], int(proof['nOut']) transaction_info = await self.daemon.getrawtransaction(tx_hash, True) result['transaction'] = transaction_info['hex'] # should have never included this (or the call to get it) raw_claim_id = self.db.get_claim_id_from_outpoint(unhexlify(tx_hash)[::-1], nout) claim_id = hexlify(raw_claim_id[::-1]).decode() claim = await self.claimtrie_getclaimbyid(claim_id) result.update(claim) return result async def claimtrie_getnthclaimforname(self, name, n): n = int(n) result = await self.claimtrie_getclaimsforname(name) if 'claims' in result and len(result['claims']) > n >= 0: # TODO: revist this after lbrycrd_#209 to see if we can sort by claim_sequence at this point result['claims'].sort(key=lambda c: (int(c['height']), int(c['nout']))) result['claims'][n]['claim_sequence'] = n return result['claims'][n] async def claimtrie_getpartialmatch(self, name, part): result = await self.claimtrie_getclaimsforname(name) if 'claims' in result: return next(filter(lambda x: x['claim_id'].starts_with(part), result['claims']), None) async def claimtrie_getclaimsforname(self, name): claims = await self.daemon.getclaimsforname(name) if claims: claims['claims'] = [self.format_claim_from_daemon(claim, name) for claim in claims['claims']] claims['supports_without_claims'] = claims['supports without claims'] del claims['supports without claims'] claims['last_takeover_height'] = claims['nLastTakeoverHeight'] del claims['nLastTakeoverHeight'] return claims return {} async def batched_formatted_claims_from_daemon(self, claim_ids): claims = await self.daemon.getclaimsbyids(claim_ids) result = [] for claim in claims: if claim and claim.get('value'): result.append(self.format_claim_from_daemon(claim)) return result def format_claim_from_daemon(self, claim, name=None): """Changes the returned claim data to the format expected by lbrynet and adds missing fields.""" if not claim: return {} # this ISO-8859 nonsense stems from a nasty form of encoding extended characters in lbrycrd # it will be fixed after the lbrycrd upstream merge to v17 is done # it originated as a fear of terminals not supporting unicode. alas, they all do if 'name' in claim: name = claim['name'].encode('ISO-8859-1').decode() claim_id = claim['claimId'] raw_claim_id = unhexlify(claim_id)[::-1] info = self.db.get_claim_info(raw_claim_id) if not info: # raise RPCError("Lbrycrd has {} but not lbryumx, please submit a bug report.".format(claim_id)) return {} address = info.address.decode() supports = self.format_supports_from_daemon(claim.get('supports', [])) amount = get_from_possible_keys(claim, 'amount', 'nAmount') height = get_from_possible_keys(claim, 'height', 'nHeight') effective_amount = get_from_possible_keys(claim, 'effective amount', 'nEffectiveAmount') valid_at_height = get_from_possible_keys(claim, 'valid at height', 'nValidAtHeight') result = { "name": name, "claim_id": claim['claimId'], "txid": claim['txid'], "nout": claim['n'], "amount": amount, "depth": self.db.db_height - height + 1, "height": height, "value": hexlify(claim['value'].encode('ISO-8859-1')).decode(), "address": address, # from index "supports": supports, "effective_amount": effective_amount, "valid_at_height": valid_at_height } if 'claim_sequence' in claim: # TODO: ensure that lbrycrd #209 fills in this value result['claim_sequence'] = claim['claim_sequence'] else: result['claim_sequence'] = -1 if 'normalized_name' in claim: result['normalized_name'] = claim['normalized_name'].encode('ISO-8859-1').decode() return result def format_supports_from_daemon(self, supports): return [[support['txid'], support['n'], get_from_possible_keys(support, 'amount', 'nAmount')] for support in supports] async def claimtrie_getclaimbyid(self, claim_id): self.assert_claim_id(claim_id) claim = await self.daemon.getclaimbyid(claim_id) return self.format_claim_from_daemon(claim) async def claimtrie_getclaimsbyids(self, *claim_ids): claims = await self.batched_formatted_claims_from_daemon(claim_ids) return dict(zip(claim_ids, claims)) def assert_tx_hash(self, value): '''Raise an RPCError if the value is not a valid transaction hash.''' try: if len(util.hex_to_bytes(value)) == 32: return except Exception: pass raise RPCError(1, f'{value} should be a transaction hash') def assert_claim_id(self, value): '''Raise an RPCError if the value is not a valid claim id hash.''' try: if len(util.hex_to_bytes(value)) == 20: return except Exception: pass raise RPCError(1, f'{value} should be a claim id hash') def normalize_name(self, name): # this is designed to match lbrycrd; change it here if it changes there return uda.normalize('NFD', name).casefold() def claim_matches_name(self, claim, name): if not name: return False if 'normalized_name' in claim: return self.normalize_name(name) == claim['normalized_name'] return name == claim['name'] async def claimtrie_getvalueforuri(self, block_hash, uri, known_certificates=None): # TODO: this thing is huge, refactor CLAIM_ID = "claim_id" WINNING = "winning" SEQUENCE = "sequence" uri = uri block_hash = block_hash try: parsed_uri = parse_lbry_uri(uri) except URIParseError as err: return {'error': err.message} result = {} if parsed_uri.contains_channel: certificate = None # TODO: this is also done on the else, refactor if parsed_uri.claim_id: if len(parsed_uri.claim_id) < CLAIM_ID_MAX_LENGTH: certificate_info = self.claimtrie_getpartialmatch(parsed_uri.name, parsed_uri.claim_id) else: certificate_info = await self.claimtrie_getclaimbyid(parsed_uri.claim_id) if certificate_info and self.claim_matches_name(certificate_info, parsed_uri.name): certificate = {'resolution_type': CLAIM_ID, 'result': certificate_info} elif parsed_uri.claim_sequence: certificate_info = await self.claimtrie_getnthclaimforname(parsed_uri.name, parsed_uri.claim_sequence) if certificate_info: certificate = {'resolution_type': SEQUENCE, 'result': certificate_info} else: certificate_info = await self.claimtrie_getvalue(parsed_uri.name, block_hash) if certificate_info: certificate = {'resolution_type': WINNING, 'result': certificate_info} if certificate and 'claim_id' not in certificate['result']: return result if certificate: result['certificate'] = certificate channel_id = certificate['result']['claim_id'] claims_in_channel = self.claimtrie_getclaimssignedbyidminimal(channel_id) if not parsed_uri.path: result['unverified_claims_in_channel'] = {claim['claim_id']: (claim['name'], claim['height']) for claim in claims_in_channel} else: # making an assumption that there aren't case conflicts on an existing channel norm_path = self.normalize_name(parsed_uri.path) result['unverified_claims_for_name'] = {claim['claim_id']: (claim['name'], claim['height']) for claim in claims_in_channel if self.normalize_name(claim['name']) == norm_path} else: claim = None if parsed_uri.claim_id: if len(parsed_uri.claim_id) < CLAIM_ID_MAX_LENGTH: claim_info = self.claimtrie_getpartialmatch(parsed_uri.name, parsed_uri.claim_id) else: claim_info = await self.claimtrie_getclaimbyid(parsed_uri.claim_id) if claim_info and self.claim_matches_name(claim_info, parsed_uri.name): claim = {'resolution_type': CLAIM_ID, 'result': claim_info} elif parsed_uri.claim_sequence: claim_info = await self.claimtrie_getnthclaimforname(parsed_uri.name, parsed_uri.claim_sequence) if claim_info: claim = {'resolution_type': SEQUENCE, 'result': claim_info} else: claim_info = await self.claimtrie_getvalue(parsed_uri.name, block_hash) if claim_info: claim = {'resolution_type': WINNING, 'result': claim_info} if (claim and # is not an unclaimed winning name (claim['resolution_type'] != WINNING or proof_has_winning_claim(claim['result']['proof']))): raw_claim_id = unhexlify(claim['result']['claim_id'])[::-1] raw_certificate_id = self.db.get_claim_info(raw_claim_id).cert_id if raw_certificate_id: certificate_id = hash_to_hex_str(raw_certificate_id) certificate = await self.claimtrie_getclaimbyid(certificate_id) if certificate: certificate = {'resolution_type': CLAIM_ID, 'result': certificate} result['certificate'] = certificate result['claim'] = claim return result async def claimtrie_getvalueforuris(self, block_hash, *uris): MAX_BATCH_URIS = 500 if len(uris) > MAX_BATCH_URIS: raise Exception("Exceeds max batch uris of {}".format(MAX_BATCH_URIS)) return {uri: await self.claimtrie_getvalueforuri(block_hash, uri) for uri in uris} # TODO: get it all concurrently when lbrycrd pending changes goes into a stable release #async def getvalue(uri): # value = await self.claimtrie_getvalueforuri(block_hash, uri) # return uri, value, #return dict([await asyncio.gather(*tuple(getvalue(uri) for uri in uris))][0]) def proof_has_winning_claim(proof): return {'txhash', 'nOut'}.issubset(proof.keys()) def get_from_possible_keys(dictionary, *keys): for key in keys: if key in dictionary: return dictionary[key]