lbry-sdk/lbry/wallet/server/session.py

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import os
import ssl
import math
import time
import json
import zlib
import pylru
import base64
import codecs
import typing
import asyncio
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import logging
import itertools
import collections
from asyncio import Event, sleep
from collections import defaultdict
from functools import partial
from binascii import hexlify
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from pylru import lrucache
from concurrent.futures import ProcessPoolExecutor, ThreadPoolExecutor
import lbry
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from lbry.wallet.server.block_processor import LBRYBlockProcessor
from lbry.wallet.server.db.writer import LBRYLevelDB
from lbry.wallet.server.db import reader
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from lbry.wallet.server.websocket import AdminWebSocket
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from lbry.wallet.server.metrics import ServerLoadData, APICallMetrics
from lbry.wallet.server.prometheus import REQUESTS_COUNT
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from lbry.wallet.rpc import (
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RPCSession, JSONRPCAutoDetect, JSONRPCConnection,
handler_invocation, RPCError, Request, JSONRPC
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)
from lbry.wallet.server import text
from lbry.wallet.server import util
from lbry.wallet.server.hash import sha256, hash_to_hex_str, hex_str_to_hash, HASHX_LEN, Base58Error
from lbry.wallet.server.daemon import DaemonError
from lbry.wallet.server.peers import PeerManager
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if typing.TYPE_CHECKING:
from lbry.wallet.server.env import Env
from lbry.wallet.server.mempool import MemPool
from lbry.wallet.server.daemon import Daemon
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BAD_REQUEST = 1
DAEMON_ERROR = 2
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log = logging.getLogger(__name__)
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def scripthash_to_hashX(scripthash: str) -> bytes:
try:
bin_hash = hex_str_to_hash(scripthash)
if len(bin_hash) == 32:
return bin_hash[:HASHX_LEN]
except Exception:
pass
raise RPCError(BAD_REQUEST, f'{scripthash} is not a valid script hash')
def non_negative_integer(value) -> int:
"""Return param value it is or can be converted to a non-negative
integer, otherwise raise an RPCError."""
try:
value = int(value)
if value >= 0:
return value
except ValueError:
pass
raise RPCError(BAD_REQUEST,
f'{value} should be a non-negative integer')
def assert_boolean(value) -> bool:
"""Return param value it is boolean otherwise raise an RPCError."""
if value in (False, True):
return value
raise RPCError(BAD_REQUEST, f'{value} should be a boolean value')
def assert_tx_hash(value: str) -> None:
"""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(BAD_REQUEST, f'{value} should be a transaction hash')
class Semaphores:
"""For aiorpcX's semaphore handling."""
def __init__(self, semaphores):
self.semaphores = semaphores
self.acquired = []
async def __aenter__(self):
for semaphore in self.semaphores:
await semaphore.acquire()
self.acquired.append(semaphore)
async def __aexit__(self, exc_type, exc_value, traceback):
for semaphore in self.acquired:
semaphore.release()
class SessionGroup:
def __init__(self, gid: int):
self.gid = gid
# Concurrency per group
self.semaphore = asyncio.Semaphore(20)
class SessionManager:
"""Holds global state about all sessions."""
def __init__(self, env: 'Env', db: LBRYLevelDB, bp: LBRYBlockProcessor, daemon: 'Daemon', mempool: 'MemPool',
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shutdown_event: asyncio.Event):
env.max_send = max(350000, env.max_send)
self.env = env
self.db = db
self.bp = bp
self.daemon = daemon
self.mempool = mempool
self.peer_mgr = PeerManager(env, db)
self.shutdown_event = shutdown_event
self.logger = util.class_logger(__name__, self.__class__.__name__)
self.servers: typing.Dict[str, asyncio.AbstractServer] = {}
self.sessions: typing.Set['SessionBase'] = set()
self.cur_group = SessionGroup(0)
self.txs_sent = 0
self.start_time = time.time()
self.history_cache = pylru.lrucache(256)
self.notified_height: typing.Optional[int] = None
# Cache some idea of room to avoid recounting on each subscription
self.subs_room = 0
self.session_event = Event()
# Set up the RPC request handlers
cmds = ('add_peer daemon_url disconnect getinfo groups log peers '
'query reorg sessions stop'.split())
LocalRPC.request_handlers.update(
{cmd: getattr(self, 'rpc_' + cmd) for cmd in cmds}
)
async def _start_server(self, kind, *args, **kw_args):
loop = asyncio.get_event_loop()
if kind == 'RPC':
protocol_class = LocalRPC
else:
protocol_class = self.env.coin.SESSIONCLS
protocol_factory = partial(protocol_class, self, self.db,
self.mempool, self.peer_mgr, kind)
host, port = args[:2]
try:
self.servers[kind] = await loop.create_server(protocol_factory, *args, **kw_args)
except OSError as e: # don't suppress CancelledError
self.logger.error(f'{kind} server failed to listen on {host}:'
f'{port:d} :{e!r}')
else:
self.logger.info(f'{kind} server listening on {host}:{port:d}')
async def _start_external_servers(self):
"""Start listening on TCP and SSL ports, but only if the respective
port was given in the environment.
"""
env = self.env
host = env.cs_host(for_rpc=False)
if env.tcp_port is not None:
await self._start_server('TCP', host, env.tcp_port)
if env.ssl_port is not None:
sslc = ssl.SSLContext(ssl.PROTOCOL_TLS)
sslc.load_cert_chain(env.ssl_certfile, keyfile=env.ssl_keyfile)
await self._start_server('SSL', host, env.ssl_port, ssl=sslc)
async def _close_servers(self, kinds):
"""Close the servers of the given kinds (TCP etc.)."""
if kinds:
self.logger.info('closing down {} listening servers'
.format(', '.join(kinds)))
for kind in kinds:
server = self.servers.pop(kind, None)
if server:
server.close()
await server.wait_closed()
async def _manage_servers(self):
paused = False
max_sessions = self.env.max_sessions
low_watermark = max_sessions * 19 // 20
while True:
await self.session_event.wait()
self.session_event.clear()
if not paused and len(self.sessions) >= max_sessions:
self.logger.info(f'maximum sessions {max_sessions:,d} '
f'reached, stopping new connections until '
f'count drops to {low_watermark:,d}')
await self._close_servers(['TCP', 'SSL'])
paused = True
# Start listening for incoming connections if paused and
# session count has fallen
if paused and len(self.sessions) <= low_watermark:
self.logger.info('resuming listening for incoming connections')
await self._start_external_servers()
paused = False
async def _log_sessions(self):
"""Periodically log sessions."""
log_interval = self.env.log_sessions
if log_interval:
while True:
await sleep(log_interval)
data = self._session_data(for_log=True)
for line in text.sessions_lines(data):
self.logger.info(line)
self.logger.info(json.dumps(self._get_info()))
def _group_map(self):
group_map = defaultdict(list)
for session in self.sessions:
group_map[session.group].append(session)
return group_map
def _sub_count(self) -> int:
return sum(s.sub_count() for s in self.sessions)
def _lookup_session(self, session_id):
try:
session_id = int(session_id)
except Exception:
pass
else:
for session in self.sessions:
if session.session_id == session_id:
return session
return None
async def _for_each_session(self, session_ids, operation):
if not isinstance(session_ids, list):
raise RPCError(BAD_REQUEST, 'expected a list of session IDs')
result = []
for session_id in session_ids:
session = self._lookup_session(session_id)
if session:
result.append(await operation(session))
else:
result.append(f'unknown session: {session_id}')
return result
async def _clear_stale_sessions(self):
"""Cut off sessions that haven't done anything for 10 minutes."""
session_timeout = self.env.session_timeout
while True:
await sleep(session_timeout // 10)
stale_cutoff = time.perf_counter() - session_timeout
stale_sessions = [session for session in self.sessions
if session.last_recv < stale_cutoff]
if stale_sessions:
text = ', '.join(str(session.session_id)
for session in stale_sessions)
self.logger.info(f'closing stale connections {text}')
# Give the sockets some time to close gracefully
if stale_sessions:
await asyncio.wait([
session.close(force_after=session_timeout // 10) for session in stale_sessions
])
# Consolidate small groups
group_map = self._group_map()
groups = [group for group, sessions in group_map.items()
if len(sessions) <= 5] # fixme: apply session cost here
if len(groups) > 1:
new_group = groups[-1]
for group in groups:
for session in group_map[group]:
session.group = new_group
def _get_info(self):
"""A summary of server state."""
group_map = self._group_map()
method_counts = collections.defaultdict(int)
error_count = 0
logged = 0
paused = 0
pending_requests = 0
closing = 0
for s in self.sessions:
error_count += s.errors
if s.log_me:
logged += 1
if not s._can_send.is_set():
paused += 1
pending_requests += s.count_pending_items()
if s.is_closing():
closing += 1
for request, _ in s.connection._requests.values():
method_counts[request.method] += 1
return {
'closing': closing,
'daemon': self.daemon.logged_url(),
'daemon_height': self.daemon.cached_height(),
'db_height': self.db.db_height,
'errors': error_count,
'groups': len(group_map),
'logged': logged,
'paused': paused,
'pid': os.getpid(),
'peers': self.peer_mgr.info(),
'requests': pending_requests,
'method_counts': method_counts,
'sessions': self.session_count(),
'subs': self._sub_count(),
'txs_sent': self.txs_sent,
'uptime': util.formatted_time(time.time() - self.start_time),
'version': lbry.__version__,
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}
def _session_data(self, for_log):
"""Returned to the RPC 'sessions' call."""
now = time.time()
sessions = sorted(self.sessions, key=lambda s: s.start_time)
return [(session.session_id,
session.flags(),
session.peer_address_str(for_log=for_log),
session.client,
session.protocol_version_string(),
session.count_pending_items(),
session.txs_sent,
session.sub_count(),
session.recv_count, session.recv_size,
session.send_count, session.send_size,
now - session.start_time)
for session in sessions]
def _group_data(self):
"""Returned to the RPC 'groups' call."""
result = []
group_map = self._group_map()
for group, sessions in group_map.items():
result.append([group.gid,
len(sessions),
sum(s.bw_charge for s in sessions),
sum(s.count_pending_items() for s in sessions),
sum(s.txs_sent for s in sessions),
sum(s.sub_count() for s in sessions),
sum(s.recv_count for s in sessions),
sum(s.recv_size for s in sessions),
sum(s.send_count for s in sessions),
sum(s.send_size for s in sessions),
])
return result
async def _electrum_and_raw_headers(self, height):
raw_header = await self.raw_header(height)
electrum_header = self.env.coin.electrum_header(raw_header, height)
return electrum_header, raw_header
async def _refresh_hsub_results(self, height):
"""Refresh the cached header subscription responses to be for height,
and record that as notified_height.
"""
# Paranoia: a reorg could race and leave db_height lower
height = min(height, self.db.db_height)
electrum, raw = await self._electrum_and_raw_headers(height)
self.hsub_results = (electrum, {'hex': raw.hex(), 'height': height})
self.notified_height = height
# --- LocalRPC command handlers
async def rpc_add_peer(self, real_name):
"""Add a peer.
real_name: "bch.electrumx.cash t50001 s50002" for example
"""
await self.peer_mgr.add_localRPC_peer(real_name)
return f"peer '{real_name}' added"
async def rpc_disconnect(self, session_ids):
"""Disconnect sessions.
session_ids: array of session IDs
"""
async def close(session):
"""Close the session's transport."""
await session.close(force_after=2)
return f'disconnected {session.session_id}'
return await self._for_each_session(session_ids, close)
async def rpc_log(self, session_ids):
"""Toggle logging of sessions.
session_ids: array of session IDs
"""
async def toggle_logging(session):
"""Toggle logging of the session."""
session.toggle_logging()
return f'log {session.session_id}: {session.log_me}'
return await self._for_each_session(session_ids, toggle_logging)
async def rpc_daemon_url(self, daemon_url):
"""Replace the daemon URL."""
daemon_url = daemon_url or self.env.daemon_url
try:
self.daemon.set_url(daemon_url)
except Exception as e:
raise RPCError(BAD_REQUEST, f'an error occurred: {e!r}')
return f'now using daemon at {self.daemon.logged_url()}'
async def rpc_stop(self):
"""Shut down the server cleanly."""
self.shutdown_event.set()
return 'stopping'
async def rpc_getinfo(self):
"""Return summary information about the server process."""
return self._get_info()
async def rpc_groups(self):
"""Return statistics about the session groups."""
return self._group_data()
async def rpc_peers(self):
"""Return a list of data about server peers."""
return self.peer_mgr.rpc_data()
async def rpc_query(self, items, limit):
"""Return a list of data about server peers."""
coin = self.env.coin
db = self.db
lines = []
def arg_to_hashX(arg):
try:
script = bytes.fromhex(arg)
lines.append(f'Script: {arg}')
return coin.hashX_from_script(script)
except ValueError:
pass
try:
hashX = coin.address_to_hashX(arg)
except Base58Error as e:
lines.append(e.args[0])
return None
lines.append(f'Address: {arg}')
return hashX
for arg in items:
hashX = arg_to_hashX(arg)
if not hashX:
continue
n = None
history = await db.limited_history(hashX, limit=limit)
for n, (tx_hash, height) in enumerate(history):
lines.append(f'History #{n:,d}: height {height:,d} '
f'tx_hash {hash_to_hex_str(tx_hash)}')
if n is None:
lines.append('No history found')
n = None
utxos = await db.all_utxos(hashX)
for n, utxo in enumerate(utxos, start=1):
lines.append(f'UTXO #{n:,d}: tx_hash '
f'{hash_to_hex_str(utxo.tx_hash)} '
f'tx_pos {utxo.tx_pos:,d} height '
f'{utxo.height:,d} value {utxo.value:,d}')
if n == limit:
break
if n is None:
lines.append('No UTXOs found')
balance = sum(utxo.value for utxo in utxos)
lines.append(f'Balance: {coin.decimal_value(balance):,f} '
f'{coin.SHORTNAME}')
return lines
async def rpc_sessions(self):
"""Return statistics about connected sessions."""
return self._session_data(for_log=False)
async def rpc_reorg(self, count):
"""Force a reorg of the given number of blocks.
count: number of blocks to reorg
"""
count = non_negative_integer(count)
if not self.bp.force_chain_reorg(count):
raise RPCError(BAD_REQUEST, 'still catching up with daemon')
return f'scheduled a reorg of {count:,d} blocks'
# --- External Interface
async def serve(self, notifications, server_listening_event):
"""Start the RPC server if enabled. When the event is triggered,
start TCP and SSL servers."""
try:
if self.env.rpc_port is not None:
await self._start_server('RPC', self.env.cs_host(for_rpc=True),
self.env.rpc_port)
self.logger.info(f'max session count: {self.env.max_sessions:,d}')
self.logger.info(f'session timeout: '
f'{self.env.session_timeout:,d} seconds')
self.logger.info(f'max response size {self.env.max_send:,d} bytes')
if self.env.drop_client is not None:
self.logger.info(f'drop clients matching: {self.env.drop_client.pattern}')
# Start notifications; initialize hsub_results
await notifications.start(self.db.db_height, self._notify_sessions)
await self.start_other()
await self._start_external_servers()
server_listening_event.set()
# Peer discovery should start after the external servers
# because we connect to ourself
await asyncio.wait([
self.peer_mgr.discover_peers(),
self._clear_stale_sessions(),
self._log_sessions(),
self._manage_servers()
])
finally:
await self._close_servers(list(self.servers.keys()))
if self.sessions:
await asyncio.wait([
session.close(force_after=1) for session in self.sessions
])
await self.stop_other()
async def start_other(self):
pass
async def stop_other(self):
pass
def session_count(self) -> int:
"""The number of connections that we've sent something to."""
return len(self.sessions)
async def daemon_request(self, method, *args):
"""Catch a DaemonError and convert it to an RPCError."""
try:
return await getattr(self.daemon, method)(*args)
except DaemonError as e:
raise RPCError(DAEMON_ERROR, f'daemon error: {e!r}') from None
async def raw_header(self, height):
"""Return the binary header at the given height."""
try:
return await self.db.raw_header(height)
except IndexError:
raise RPCError(BAD_REQUEST, f'height {height:,d} '
'out of range') from None
async def electrum_header(self, height):
"""Return the deserialized header at the given height."""
electrum_header, _ = await self._electrum_and_raw_headers(height)
return electrum_header
async def broadcast_transaction(self, raw_tx):
hex_hash = await self.daemon.broadcast_transaction(raw_tx)
self.mempool.wakeup.set()
self.txs_sent += 1
return hex_hash
async def limited_history(self, hashX):
"""A caching layer."""
hc = self.history_cache
if hashX not in hc:
# History DoS limit. Each element of history is about 99
# bytes when encoded as JSON. This limits resource usage
# on bloated history requests, and uses a smaller divisor
# so large requests are logged before refusing them.
limit = self.env.max_send // 97
hc[hashX] = await self.db.limited_history(hashX, limit=limit)
return hc[hashX]
async def _notify_sessions(self, height, touched):
"""Notify sessions about height changes and touched addresses."""
height_changed = height != self.notified_height
if height_changed:
await self._refresh_hsub_results(height)
# Invalidate our history cache for touched hashXs
hc = self.history_cache
for hashX in set(hc).intersection(touched):
del hc[hashX]
if self.sessions:
await asyncio.wait([
session.notify(touched, height_changed) for session in self.sessions
])
def add_session(self, session):
self.sessions.add(session)
self.session_event.set()
gid = int(session.start_time - self.start_time) // 900
if self.cur_group.gid != gid:
self.cur_group = SessionGroup(gid)
return self.cur_group
def remove_session(self, session):
"""Remove a session from our sessions list if there."""
self.sessions.remove(session)
self.session_event.set()
class SessionBase(RPCSession):
"""Base class of ElectrumX JSON sessions.
Each session runs its tasks in asynchronous parallelism with other
sessions.
"""
MAX_CHUNK_SIZE = 40960
session_counter = itertools.count()
request_handlers: typing.Dict[str, typing.Callable] = {}
version = '0.5.7'
def __init__(self, session_mgr, db, mempool, peer_mgr, kind):
connection = JSONRPCConnection(JSONRPCAutoDetect)
super().__init__(connection=connection)
self.logger = util.class_logger(__name__, self.__class__.__name__)
self.session_mgr = session_mgr
self.db = db
self.mempool = mempool
self.peer_mgr = peer_mgr
self.kind = kind # 'RPC', 'TCP' etc.
self.env = session_mgr.env
self.coin = self.env.coin
self.client = 'unknown'
self.anon_logs = self.env.anon_logs
self.txs_sent = 0
self.log_me = False
self.daemon_request = self.session_mgr.daemon_request
# Hijack the connection so we can log messages
self._receive_message_orig = self.connection.receive_message
self.connection.receive_message = self.receive_message
async def notify(self, touched, height_changed):
pass
def peer_address_str(self, *, for_log=True):
"""Returns the peer's IP address and port as a human-readable
string, respecting anon logs if the output is for a log."""
if for_log and self.anon_logs:
return 'xx.xx.xx.xx:xx'
return super().peer_address_str()
def receive_message(self, message):
if self.log_me:
self.logger.info(f'processing {message}')
return self._receive_message_orig(message)
def toggle_logging(self):
self.log_me = not self.log_me
def flags(self):
"""Status flags."""
status = self.kind[0]
if self.is_closing():
status += 'C'
if self.log_me:
status += 'L'
status += str(self._concurrency.max_concurrent)
return status
def connection_made(self, transport):
"""Handle an incoming client connection."""
super().connection_made(transport)
self.session_id = next(self.session_counter)
context = {'conn_id': f'{self.session_id}'}
self.logger = util.ConnectionLogger(self.logger, context)
self.group = self.session_mgr.add_session(self)
self.logger.info(f'{self.kind} {self.peer_address_str()}, '
f'{self.session_mgr.session_count():,d} total')
def connection_lost(self, exc):
"""Handle client disconnection."""
super().connection_lost(exc)
self.session_mgr.remove_session(self)
msg = ''
if not self._can_send.is_set():
msg += ' whilst paused'
if self.send_size >= 1024*1024:
msg += ('. Sent {:,d} bytes in {:,d} messages'
.format(self.send_size, self.send_count))
if msg:
msg = 'disconnected' + msg
self.logger.info(msg)
def count_pending_items(self):
return len(self.connection.pending_requests())
def semaphore(self):
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return Semaphores([self.group.semaphore])
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def sub_count(self):
return 0
async def handle_request(self, request):
"""Handle an incoming request. ElectrumX doesn't receive
notifications from client sessions.
"""
REQUESTS_COUNT.inc()
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if isinstance(request, Request):
handler = self.request_handlers.get(request.method)
else:
handler = None
coro = handler_invocation(handler, request)()
return await coro
class LBRYSessionManager(SessionManager):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.query_executor = None
self.websocket = None
self.metrics = ServerLoadData()
self.metrics_loop = None
self.running = False
if self.env.websocket_host is not None and self.env.websocket_port is not None:
self.websocket = AdminWebSocket(self)
self.search_cache = self.bp.search_cache
self.search_cache['search'] = lrucache(10000)
self.search_cache['resolve'] = lrucache(10000)
async def process_metrics(self):
while self.running:
data = self.metrics.to_json_and_reset({
'sessions': self.session_count(),
'height': self.db.db_height,
})
if self.websocket is not None:
self.websocket.send_message(data)
await asyncio.sleep(1)
async def start_other(self):
self.running = True
path = os.path.join(self.env.db_dir, 'claims.db')
args = dict(
initializer=reader.initializer,
initargs=(self.logger, path, self.env.coin.NET, self.env.database_query_timeout,
self.env.track_metrics, self.db.sql.blocked_claims)
)
if self.env.max_query_workers is not None and self.env.max_query_workers == 0:
self.query_executor = ThreadPoolExecutor(max_workers=1, **args)
else:
self.query_executor = ProcessPoolExecutor(
max_workers=self.env.max_query_workers or max(os.cpu_count(), 4), **args
)
if self.websocket is not None:
await self.websocket.start()
if self.env.track_metrics:
self.metrics_loop = asyncio.create_task(self.process_metrics())
async def stop_other(self):
self.running = False
if self.env.track_metrics:
self.metrics_loop.cancel()
if self.websocket is not None:
await self.websocket.stop()
self.query_executor.shutdown()
class LBRYElectrumX(SessionBase):
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"""A TCP server that handles incoming Electrum connections."""
PROTOCOL_MIN = (0, 52, 0)
PROTOCOL_MAX = (0, 99, 0)
max_errors = math.inf # don't disconnect people for errors! let them happen...
session_mgr: LBRYSessionManager
version = lbry.__version__
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def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.subscribe_headers = False
self.subscribe_headers_raw = False
self.connection.max_response_size = self.env.max_send
self.hashX_subs = {}
self.sv_seen = False
self.mempool_statuses = {}
self.set_request_handlers(self.PROTOCOL_MIN)
# 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: LBRYLevelDB = self.bp.db
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@classmethod
def protocol_min_max_strings(cls):
return [util.version_string(ver)
for ver in (cls.PROTOCOL_MIN, cls.PROTOCOL_MAX)]
@classmethod
def server_features(cls, env):
"""Return the server features dictionary."""
min_str, max_str = cls.protocol_min_max_strings()
return {
'hosts': env.hosts_dict(),
'pruning': None,
'server_version': cls.version,
'protocol_min': min_str,
'protocol_max': max_str,
'genesis_hash': env.coin.GENESIS_HASH,
'description': env.description,
'payment_address': env.donation_address,
'daily_fee': env.daily_fee,
'hash_function': 'sha256',
}
async def server_features_async(self):
return self.server_features(self.env)
@classmethod
def server_version_args(cls):
"""The arguments to a server.version RPC call to a peer."""
return [cls.version, cls.protocol_min_max_strings()]
def protocol_version_string(self):
return util.version_string(self.protocol_tuple)
def sub_count(self):
return len(self.hashX_subs)
async def notify(self, touched, height_changed):
"""Notify the client about changes to touched addresses (from mempool
updates or new blocks) and height.
"""
if height_changed and self.subscribe_headers:
args = (await self.subscribe_headers_result(), )
await self.send_notification('blockchain.headers.subscribe', args)
touched = touched.intersection(self.hashX_subs)
if touched or (height_changed and self.mempool_statuses):
changed = {}
for hashX in touched:
alias = self.hashX_subs[hashX]
status = await self.address_status(hashX)
changed[alias] = status
# Check mempool hashXs - the status is a function of the
# confirmed state of other transactions. Note: we cannot
# iterate over mempool_statuses as it changes size.
for hashX in tuple(self.mempool_statuses):
# Items can be evicted whilst await-ing status; False
# ensures such hashXs are notified
old_status = self.mempool_statuses.get(hashX, False)
status = await self.address_status(hashX)
if status != old_status:
alias = self.hashX_subs[hashX]
changed[alias] = status
for alias, status in changed.items():
if len(alias) == 64:
method = 'blockchain.scripthash.subscribe'
else:
method = 'blockchain.address.subscribe'
await self.send_notification(method, (alias, status))
if changed:
es = '' if len(changed) == 1 else 'es'
self.logger.info(f'notified of {len(changed):,d} address{es}')
def get_metrics_or_placeholder_for_api(self, query_name):
""" Do not hold on to a reference to the metrics
returned by this method past an `await` or
you may be working with a stale metrics object.
"""
if self.env.track_metrics:
return self.session_mgr.metrics.for_api(query_name)
else:
return APICallMetrics(query_name)
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async def run_in_executor(self, query_name, func, kwargs):
start = time.perf_counter()
try:
result = await asyncio.get_running_loop().run_in_executor(
self.session_mgr.query_executor, func, kwargs
)
except asyncio.CancelledError:
raise
except reader.SQLiteInterruptedError as error:
metrics = self.get_metrics_or_placeholder_for_api(query_name)
metrics.query_interrupt(start, error.metrics)
raise RPCError(JSONRPC.QUERY_TIMEOUT, 'sqlite query timed out')
except reader.SQLiteOperationalError as error:
metrics = self.get_metrics_or_placeholder_for_api(query_name)
metrics.query_error(start, error.metrics)
raise RPCError(JSONRPC.INTERNAL_ERROR, 'query failed to execute')
except Exception:
log.exception("dear devs, please handle this exception better")
metrics = self.get_metrics_or_placeholder_for_api(query_name)
metrics.query_error(start, {})
raise RPCError(JSONRPC.INTERNAL_ERROR, 'unknown server error')
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if self.env.track_metrics:
metrics = self.get_metrics_or_placeholder_for_api(query_name)
(result, metrics_data) = result
metrics.query_response(start, metrics_data)
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return base64.b64encode(result).decode()
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async def run_and_cache_query(self, query_name, function, kwargs):
metrics = self.get_metrics_or_placeholder_for_api(query_name)
metrics.start()
cache = self.session_mgr.search_cache[query_name]
cache_key = str(kwargs)
cache_item = cache.get(cache_key)
if cache_item is None:
cache_item = cache[cache_key] = ResultCacheItem()
elif cache_item.result is not None:
metrics.cache_response()
return cache_item.result
async with cache_item.lock:
if cache_item.result is None:
cache_item.result = await self.run_in_executor(
query_name, function, kwargs
)
else:
metrics = self.get_metrics_or_placeholder_for_api(query_name)
metrics.cache_response()
return cache_item.result
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async def claimtrie_search(self, **kwargs):
if kwargs:
return await self.run_and_cache_query('search', reader.search_to_bytes, kwargs)
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async def claimtrie_resolve(self, *urls):
if urls:
return await self.run_and_cache_query('resolve', reader.resolve_to_bytes, urls)
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async def get_server_height(self):
return self.bp.height
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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
return (self.db.db_height - transaction_info['confirmations']) + 1
elif transaction_info and 'hex' in transaction_info:
return -1
return None
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async def claimtrie_getclaimsbyids(self, *claim_ids):
claims = await self.batched_formatted_claims_from_daemon(claim_ids)
return dict(zip(claim_ids, claims))
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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
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def format_claim_from_daemon(self, claim, name=None):
"""Changes the returned claim data to the format expected by lbry and adds missing fields."""
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if not claim:
return {}
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# 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
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if 'name' in claim:
name = claim['name'].encode('ISO-8859-1').decode()
info = self.db.sql.get_claims(claim_id=claim['claimId'])
if not info:
# raise RPCError("Lbrycrd has {} but not lbryumx, please submit a bug report.".format(claim_id))
return {}
address = info.address.decode()
# fixme: temporary
#supports = self.format_supports_from_daemon(claim.get('supports', []))
supports = []
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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 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')
async def subscribe_headers_result(self):
"""The result of a header subscription or notification."""
return self.session_mgr.hsub_results[self.subscribe_headers_raw]
async def _headers_subscribe(self, raw):
"""Subscribe to get headers of new blocks."""
self.subscribe_headers_raw = assert_boolean(raw)
self.subscribe_headers = True
return await self.subscribe_headers_result()
async def headers_subscribe(self):
"""Subscribe to get raw headers of new blocks."""
return await self._headers_subscribe(True)
async def headers_subscribe_True(self, raw=True):
"""Subscribe to get headers of new blocks."""
return await self._headers_subscribe(raw)
async def headers_subscribe_False(self, raw=False):
"""Subscribe to get headers of new blocks."""
return await self._headers_subscribe(raw)
async def add_peer(self, features):
"""Add a peer (but only if the peer resolves to the source)."""
return await self.peer_mgr.on_add_peer(features, self.peer_address())
async def peers_subscribe(self):
"""Return the server peers as a list of (ip, host, details) tuples."""
return self.peer_mgr.on_peers_subscribe(self.is_tor())
async def address_status(self, hashX):
"""Returns an address status.
Status is a hex string, but must be None if there is no history.
"""
# Note history is ordered and mempool unordered in electrum-server
# For mempool, height is -1 if it has unconfirmed inputs, otherwise 0
db_history = await self.session_mgr.limited_history(hashX)
mempool = await self.mempool.transaction_summaries(hashX)
status = ''.join(f'{hash_to_hex_str(tx_hash)}:'
f'{height:d}:'
for tx_hash, height in db_history)
status += ''.join(f'{hash_to_hex_str(tx.hash)}:'
f'{-tx.has_unconfirmed_inputs:d}:'
for tx in mempool)
if status:
status = sha256(status.encode()).hex()
else:
status = None
if mempool:
self.mempool_statuses[hashX] = status
else:
self.mempool_statuses.pop(hashX, None)
return status
async def hashX_listunspent(self, hashX):
"""Return the list of UTXOs of a script hash, including mempool
effects."""
utxos = await self.db.all_utxos(hashX)
utxos = sorted(utxos)
utxos.extend(await self.mempool.unordered_UTXOs(hashX))
spends = await self.mempool.potential_spends(hashX)
return [{'tx_hash': hash_to_hex_str(utxo.tx_hash),
'tx_pos': utxo.tx_pos,
'height': utxo.height, 'value': utxo.value}
for utxo in utxos
if (utxo.tx_hash, utxo.tx_pos) not in spends]
async def hashX_subscribe(self, hashX, alias):
self.hashX_subs[hashX] = alias
return await self.address_status(hashX)
async def hashX_unsubscribe(self, hashX, alias):
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del self.hashX_subs[hashX]
def address_to_hashX(self, address):
try:
return self.coin.address_to_hashX(address)
except Exception:
pass
raise RPCError(BAD_REQUEST, f'{address} is not a valid address')
async def address_get_balance(self, address):
"""Return the confirmed and unconfirmed balance of an address."""
hashX = self.address_to_hashX(address)
return await self.get_balance(hashX)
async def address_get_history(self, address):
"""Return the confirmed and unconfirmed history of an address."""
hashX = self.address_to_hashX(address)
return await self.confirmed_and_unconfirmed_history(hashX)
async def address_get_mempool(self, address):
"""Return the mempool transactions touching an address."""
hashX = self.address_to_hashX(address)
return await self.unconfirmed_history(hashX)
async def address_listunspent(self, address):
"""Return the list of UTXOs of an address."""
hashX = self.address_to_hashX(address)
return await self.hashX_listunspent(hashX)
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async def address_subscribe(self, *addresses):
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"""Subscribe to an address.
address: the address to subscribe to"""
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if len(addresses) > 1000:
raise RPCError(BAD_REQUEST, f'too many addresses in subscription request: {len(addresses)}')
hashXes = [
(self.address_to_hashX(address), address) for address in addresses
]
return await asyncio.gather(*(self.hashX_subscribe(*args) for args in hashXes))
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async def address_unsubscribe(self, address):
"""Unsubscribe an address.
address: the address to unsubscribe"""
hashX = self.address_to_hashX(address)
return await self.hashX_unsubscribe(hashX, address)
async def get_balance(self, hashX):
utxos = await self.db.all_utxos(hashX)
confirmed = sum(utxo.value for utxo in utxos)
unconfirmed = await self.mempool.balance_delta(hashX)
return {'confirmed': confirmed, 'unconfirmed': unconfirmed}
async def scripthash_get_balance(self, scripthash):
"""Return the confirmed and unconfirmed balance of a scripthash."""
hashX = scripthash_to_hashX(scripthash)
return await self.get_balance(hashX)
async def unconfirmed_history(self, hashX):
# Note unconfirmed history is unordered in electrum-server
# height is -1 if it has unconfirmed inputs, otherwise 0
return [{'tx_hash': hash_to_hex_str(tx.hash),
'height': -tx.has_unconfirmed_inputs,
'fee': tx.fee}
for tx in await self.mempool.transaction_summaries(hashX)]
async def confirmed_and_unconfirmed_history(self, hashX):
# Note history is ordered but unconfirmed is unordered in e-s
history = await self.session_mgr.limited_history(hashX)
conf = [{'tx_hash': hash_to_hex_str(tx_hash), 'height': height}
for tx_hash, height in history]
return conf + await self.unconfirmed_history(hashX)
async def scripthash_get_history(self, scripthash):
"""Return the confirmed and unconfirmed history of a scripthash."""
hashX = scripthash_to_hashX(scripthash)
return await self.confirmed_and_unconfirmed_history(hashX)
async def scripthash_get_mempool(self, scripthash):
"""Return the mempool transactions touching a scripthash."""
hashX = scripthash_to_hashX(scripthash)
return await self.unconfirmed_history(hashX)
async def scripthash_listunspent(self, scripthash):
"""Return the list of UTXOs of a scripthash."""
hashX = scripthash_to_hashX(scripthash)
return await self.hashX_listunspent(hashX)
async def scripthash_subscribe(self, scripthash):
"""Subscribe to a script hash.
scripthash: the SHA256 hash of the script to subscribe to"""
hashX = scripthash_to_hashX(scripthash)
return await self.hashX_subscribe(hashX, scripthash)
async def _merkle_proof(self, cp_height, height):
max_height = self.db.db_height
if not height <= cp_height <= max_height:
raise RPCError(BAD_REQUEST,
f'require header height {height:,d} <= '
f'cp_height {cp_height:,d} <= '
f'chain height {max_height:,d}')
branch, root = await self.db.header_branch_and_root(cp_height + 1,
height)
return {
'branch': [hash_to_hex_str(elt) for elt in branch],
'root': hash_to_hex_str(root),
}
async def block_header(self, height, cp_height=0):
"""Return a raw block header as a hexadecimal string, or as a
dictionary with a merkle proof."""
height = non_negative_integer(height)
cp_height = non_negative_integer(cp_height)
raw_header_hex = (await self.session_mgr.raw_header(height)).hex()
if cp_height == 0:
return raw_header_hex
result = {'header': raw_header_hex}
result.update(await self._merkle_proof(cp_height, height))
return result
async def block_header_13(self, height):
"""Return a raw block header as a hexadecimal string.
height: the header's height"""
return await self.block_header(height)
async def block_headers(self, start_height, count, cp_height=0, b64=False):
"""Return count concatenated block headers as hex for the main chain;
starting at start_height.
start_height and count must be non-negative integers. At most
MAX_CHUNK_SIZE headers will be returned.
"""
start_height = non_negative_integer(start_height)
count = non_negative_integer(count)
cp_height = non_negative_integer(cp_height)
max_size = self.MAX_CHUNK_SIZE
count = min(count, max_size)
headers, count = await self.db.read_headers(start_height, count)
compressobj = zlib.compressobj(wbits=-15, level=1, memLevel=9)
headers = base64.b64encode(compressobj.compress(headers) + compressobj.flush()).decode() if b64 else headers.hex()
result = {
'base64' if b64 else 'hex': headers,
'count': count,
'max': max_size
}
if count and cp_height:
last_height = start_height + count - 1
result.update(await self._merkle_proof(cp_height, last_height))
return result
async def block_get_chunk(self, index):
"""Return a chunk of block headers as a hexadecimal string.
index: the chunk index"""
index = non_negative_integer(index)
size = self.coin.CHUNK_SIZE
start_height = index * size
headers, _ = await self.db.read_headers(start_height, size)
return headers.hex()
async def block_get_header(self, height):
"""The deserialized header at a given height.
height: the header's height"""
height = non_negative_integer(height)
return await self.session_mgr.electrum_header(height)
def is_tor(self):
"""Try to detect if the connection is to a tor hidden service we are
running."""
peername = self.peer_mgr.proxy_peername()
if not peername:
return False
peer_address = self.peer_address()
return peer_address and peer_address[0] == peername[0]
async def replaced_banner(self, banner):
network_info = await self.daemon_request('getnetworkinfo')
ni_version = network_info['version']
major, minor = divmod(ni_version, 1000000)
minor, revision = divmod(minor, 10000)
revision //= 100
daemon_version = f'{major:d}.{minor:d}.{revision:d}'
for pair in [
('$SERVER_VERSION', self.version),
('$DAEMON_VERSION', daemon_version),
('$DAEMON_SUBVERSION', network_info['subversion']),
('$DONATION_ADDRESS', self.env.donation_address),
]:
banner = banner.replace(*pair)
return banner
async def donation_address(self):
"""Return the donation address as a string, empty if there is none."""
return self.env.donation_address
async def banner(self):
"""Return the server banner text."""
banner = f'You are connected to an {self.version} server.'
if self.is_tor():
banner_file = self.env.tor_banner_file
else:
banner_file = self.env.banner_file
if banner_file:
try:
with codecs.open(banner_file, 'r', 'utf-8') as f:
banner = f.read()
except Exception as e:
self.logger.error(f'reading banner file {banner_file}: {e!r}')
else:
banner = await self.replaced_banner(banner)
return banner
async def relayfee(self):
"""The minimum fee a low-priority tx must pay in order to be accepted
to the daemon's memory pool."""
return await self.daemon_request('relayfee')
async def estimatefee(self, number):
"""The estimated transaction fee per kilobyte to be paid for a
transaction to be included within a certain number of blocks.
number: the number of blocks
"""
number = non_negative_integer(number)
return await self.daemon_request('estimatefee', number)
async def ping(self):
"""Serves as a connection keep-alive mechanism and for the client to
confirm the server is still responding.
"""
return None
async def server_version(self, client_name='', protocol_version=None):
"""Returns the server version as a string.
client_name: a string identifying the client
protocol_version: the protocol version spoken by the client
"""
if self.sv_seen and self.protocol_tuple >= (1, 4):
raise RPCError(BAD_REQUEST, f'server.version already sent')
self.sv_seen = True
if client_name:
client_name = str(client_name)
if self.env.drop_client is not None and \
self.env.drop_client.match(client_name):
self.close_after_send = True
raise RPCError(BAD_REQUEST,
f'unsupported client: {client_name}')
self.client = client_name[:17]
# Find the highest common protocol version. Disconnect if
# that protocol version in unsupported.
ptuple, client_min = util.protocol_version(
protocol_version, self.PROTOCOL_MIN, self.PROTOCOL_MAX)
if ptuple is None:
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# FIXME: this fills the logs
# if client_min > self.PROTOCOL_MIN:
# self.logger.info(f'client requested future protocol version '
# f'{util.version_string(client_min)} '
# f'- is your software out of date?')
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self.close_after_send = True
raise RPCError(BAD_REQUEST,
f'unsupported protocol version: {protocol_version}')
self.set_request_handlers(ptuple)
return self.version, self.protocol_version_string()
async def transaction_broadcast(self, raw_tx):
"""Broadcast a raw transaction to the network.
raw_tx: the raw transaction as a hexadecimal string"""
# This returns errors as JSON RPC errors, as is natural
try:
hex_hash = await self.session_mgr.broadcast_transaction(raw_tx)
self.txs_sent += 1
self.logger.info(f'sent tx: {hex_hash}')
return hex_hash
except DaemonError as e:
error, = e.args
message = error['message']
self.logger.info(f'error sending transaction: {message}')
raise RPCError(BAD_REQUEST, 'the transaction was rejected by '
f'network rules.\n\n{message}\n[{raw_tx}]')
async def transaction_get(self, tx_hash, verbose=False):
"""Return the serialized raw transaction given its hash
tx_hash: the transaction hash as a hexadecimal string
verbose: passed on to the daemon
"""
assert_tx_hash(tx_hash)
if verbose not in (True, False):
raise RPCError(BAD_REQUEST, f'"verbose" must be a boolean')
return await self.daemon_request('getrawtransaction', tx_hash, verbose)
async def _block_hash_and_tx_hashes(self, height):
"""Returns a pair (block_hash, tx_hashes) for the main chain block at
the given height.
block_hash is a hexadecimal string, and tx_hashes is an
ordered list of hexadecimal strings.
"""
height = non_negative_integer(height)
hex_hashes = await self.daemon_request('block_hex_hashes', height, 1)
block_hash = hex_hashes[0]
block = await self.daemon_request('deserialised_block', block_hash)
return block_hash, block['tx']
def _get_merkle_branch(self, tx_hashes, tx_pos):
"""Return a merkle branch to a transaction.
tx_hashes: ordered list of hex strings of tx hashes in a block
tx_pos: index of transaction in tx_hashes to create branch for
"""
hashes = [hex_str_to_hash(hash) for hash in tx_hashes]
branch, root = self.db.merkle.branch_and_root(hashes, tx_pos)
branch = [hash_to_hex_str(hash) for hash in branch]
return branch
async def transaction_merkle(self, tx_hash, height):
"""Return the markle branch to a confirmed transaction given its hash
and height.
tx_hash: the transaction hash as a hexadecimal string
height: the height of the block it is in
"""
assert_tx_hash(tx_hash)
block_hash, tx_hashes = await self._block_hash_and_tx_hashes(height)
try:
pos = tx_hashes.index(tx_hash)
except ValueError:
raise RPCError(BAD_REQUEST, f'tx hash {tx_hash} not in '
f'block {block_hash} at height {height:,d}')
branch = self._get_merkle_branch(tx_hashes, pos)
return {"block_height": height, "merkle": branch, "pos": pos}
async def transaction_id_from_pos(self, height, tx_pos, merkle=False):
"""Return the txid and optionally a merkle proof, given
a block height and position in the block.
"""
tx_pos = non_negative_integer(tx_pos)
if merkle not in (True, False):
raise RPCError(BAD_REQUEST, f'"merkle" must be a boolean')
block_hash, tx_hashes = await self._block_hash_and_tx_hashes(height)
try:
tx_hash = tx_hashes[tx_pos]
except IndexError:
raise RPCError(BAD_REQUEST, f'no tx at position {tx_pos:,d} in '
f'block {block_hash} at height {height:,d}')
if merkle:
branch = self._get_merkle_branch(tx_hashes, tx_pos)
return {"tx_hash": tx_hash, "merkle": branch}
else:
return tx_hash
def set_request_handlers(self, ptuple):
self.protocol_tuple = ptuple
handlers = {
'blockchain.block.get_chunk': self.block_get_chunk,
'blockchain.block.get_header': self.block_get_header,
'blockchain.estimatefee': self.estimatefee,
'blockchain.relayfee': self.relayfee,
'blockchain.scripthash.get_balance': self.scripthash_get_balance,
'blockchain.scripthash.get_history': self.scripthash_get_history,
'blockchain.scripthash.get_mempool': self.scripthash_get_mempool,
'blockchain.scripthash.listunspent': self.scripthash_listunspent,
'blockchain.scripthash.subscribe': self.scripthash_subscribe,
'blockchain.transaction.broadcast': self.transaction_broadcast,
'blockchain.transaction.get': self.transaction_get,
'blockchain.transaction.get_merkle': self.transaction_merkle,
'server.add_peer': self.add_peer,
'server.banner': self.banner,
'server.donation_address': self.donation_address,
'server.features': self.server_features_async,
'server.peers.subscribe': self.peers_subscribe,
'server.version': self.server_version,
'blockchain.transaction.get_height': self.transaction_get_height,
'blockchain.claimtrie.search': self.claimtrie_search,
'blockchain.claimtrie.resolve': self.claimtrie_resolve,
'blockchain.claimtrie.getclaimsbyids': self.claimtrie_getclaimsbyids,
'blockchain.block.get_server_height': self.get_server_height,
'mempool.get_fee_histogram': self.mempool.compact_fee_histogram,
'blockchain.block.headers': self.block_headers,
'server.ping': self.ping,
'blockchain.headers.subscribe': self.headers_subscribe_False,
'blockchain.address.get_balance': self.address_get_balance,
'blockchain.address.get_history': self.address_get_history,
'blockchain.address.get_mempool': self.address_get_mempool,
'blockchain.address.listunspent': self.address_listunspent,
'blockchain.address.subscribe': self.address_subscribe,
'blockchain.address.unsubscribe': self.address_unsubscribe,
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}
self.request_handlers = handlers
class LocalRPC(SessionBase):
"""A local TCP RPC server session."""
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.client = 'RPC'
self.connection._max_response_size = 0
def protocol_version_string(self):
return 'RPC'
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class ResultCacheItem:
__slots__ = '_result', 'lock', 'has_result'
def __init__(self):
self.has_result = asyncio.Event()
self.lock = asyncio.Lock()
self._result = None
@property
def result(self) -> str:
return self._result
@result.setter
def result(self, result: str):
self._result = result
if result is not None:
self.has_result.set()
def get_from_possible_keys(dictionary, *keys):
for key in keys:
if key in dictionary:
return dictionary[key]