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636 lines
24 KiB
636 lines
24 KiB
# Copyright (c) 2016-2018, Neil Booth
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#
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# All rights reserved.
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#
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# See the file "LICENCE" for information about the copyright
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# and warranty status of this software.
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'''Classes for local RPC server and remote client TCP/SSL servers.'''
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import codecs
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import itertools
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import time
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import datetime
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from functools import partial
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from aiorpcx import ServerSession, JSONRPCAutoDetect, RPCError
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from lib.hash import sha256, hash_to_str
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import lib.util as util
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from server.daemon import DaemonError
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BAD_REQUEST = 1
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DAEMON_ERROR = 2
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class Semaphores(object):
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def __init__(self, semaphores):
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self.semaphores = semaphores
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self.acquired = []
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async def __aenter__(self):
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for semaphore in self.semaphores:
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await semaphore.acquire()
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self.acquired.append(semaphore)
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async def __aexit__(self, exc_type, exc_value, traceback):
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for semaphore in self.acquired:
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semaphore.release()
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class SessionBase(ServerSession):
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'''Base class of ElectrumX JSON sessions.
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Each session runs its tasks in asynchronous parallelism with other
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sessions.
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'''
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MAX_CHUNK_SIZE = 2016
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session_counter = itertools.count()
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def __init__(self, controller, kind):
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super().__init__(rpc_protocol=JSONRPCAutoDetect)
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self.kind = kind # 'RPC', 'TCP' etc.
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self.controller = controller
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self.bp = controller.bp
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self.env = controller.env
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self.daemon = self.bp.daemon
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self.client = 'unknown'
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self.client_version = (1, )
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self.anon_logs = self.env.anon_logs
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self.txs_sent = 0
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self.log_me = False
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self.bw_limit = self.env.bandwidth_limit
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self._orig_mr = self.rpc.message_received
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def peer_address_str(self, *, for_log=True):
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'''Returns the peer's IP address and port as a human-readable
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string, respecting anon logs if the output is for a log.'''
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if for_log and self.anon_logs:
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return 'xx.xx.xx.xx:xx'
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return super().peer_address_str()
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def message_received(self, message):
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self.logger.info(f'processing {message}')
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self._orig_mr(message)
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def toggle_logging(self):
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self.log_me = not self.log_me
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if self.log_me:
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self.rpc.message_received = self.message_received
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else:
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self.rpc.message_received = self._orig_mr
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def flags(self):
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'''Status flags.'''
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status = self.kind[0]
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if self.is_closing():
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status += 'C'
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if self.log_me:
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status += 'L'
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status += str(self.concurrency.max_concurrent)
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return status
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def connection_made(self, transport):
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'''Handle an incoming client connection.'''
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super().connection_made(transport)
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self.session_id = next(self.session_counter)
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context = {'conn_id': f'{self.session_id}'}
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self.logger = util.ConnectionLogger(self.logger, context)
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self.rpc.logger = self.logger
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self.group = self.controller.add_session(self)
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self.logger.info(f'{self.kind} {self.peer_address_str()}, '
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f'{len(self.controller.sessions):,d} total')
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def connection_lost(self, exc):
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'''Handle client disconnection.'''
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super().connection_lost(exc)
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self.controller.remove_session(self)
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msg = ''
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if self.paused:
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msg += ' whilst paused'
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if self.concurrency.max_concurrent != self.max_concurrent:
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msg += ' whilst throttled'
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if self.send_size >= 1024*1024:
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msg += ('. Sent {:,d} bytes in {:,d} messages'
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.format(self.send_size, self.send_count))
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if msg:
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msg = 'disconnected' + msg
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self.logger.info(msg)
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def count_pending_items(self):
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return self.rpc.pending_requests
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def semaphore(self):
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return Semaphores([self.concurrency.semaphore, self.group.semaphore])
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def sub_count(self):
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return 0
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class ElectrumX(SessionBase):
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'''A TCP server that handles incoming Electrum connections.'''
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.subscribe_headers = False
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self.subscribe_headers_raw = False
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self.notified_height = None
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self.max_response_size = self.env.max_send
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self.max_subs = self.env.max_session_subs
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self.hashX_subs = {}
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self.mempool_statuses = {}
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self.protocol_version = None
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self.set_protocol_handlers((1, 1))
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def sub_count(self):
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return len(self.hashX_subs)
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async def notify_async(self, our_touched):
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changed = {}
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for hashX in our_touched:
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alias = self.hashX_subs[hashX]
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status = await self.address_status(hashX)
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changed[alias] = status
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# Check mempool hashXs - the status is a function of the
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# confirmed state of other transactions. Note: we cannot
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# iterate over mempool_statuses as it changes size.
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for hashX in set(self.mempool_statuses):
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old_status = self.mempool_statuses[hashX]
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status = await self.address_status(hashX)
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if status != old_status:
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alias = self.hashX_subs[hashX]
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changed[alias] = status
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for alias, status in changed.items():
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if len(alias) == 64:
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method = 'blockchain.scripthash.subscribe'
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else:
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method = 'blockchain.address.subscribe'
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self.send_notification(method, (alias, status))
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if changed:
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es = '' if len(changed) == 1 else 'es'
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self.logger.info('notified of {:,d} address{}'
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.format(len(changed), es))
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def notify(self, height, touched):
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'''Notify the client about changes to touched addresses (from mempool
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updates or new blocks) and height.
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Return the set of addresses the session needs to be
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asyncronously notified about. This can be empty if there are
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possible mempool status updates.
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Returns None if nothing needs to be notified asynchronously.
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'''
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height_changed = height != self.notified_height
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if height_changed:
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self.notified_height = height
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if self.subscribe_headers:
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args = (self.subscribe_headers_result(height), )
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self.send_notification('blockchain.headers.subscribe', args)
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our_touched = touched.intersection(self.hashX_subs)
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if our_touched or (height_changed and self.mempool_statuses):
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return our_touched
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return None
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def height(self):
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'''Return the current flushed database height.'''
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return self.bp.db_height
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def assert_boolean(self, value):
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'''Return param value it is boolean otherwise raise an RPCError.'''
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if value in (False, True):
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return value
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raise RPCError(BAD_REQUEST, f'{value} should be a boolean value')
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def subscribe_headers_result(self, height):
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'''The result of a header subscription for the given height.'''
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if self.subscribe_headers_raw:
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raw_header = self.controller.raw_header(height)
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return {'hex': raw_header.hex(), 'height': height}
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return self.controller.electrum_header(height)
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def headers_subscribe(self, raw=False):
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'''Subscribe to get headers of new blocks.'''
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self.subscribe_headers = True
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self.subscribe_headers_raw = self.assert_boolean(raw)
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self.notified_height = self.height()
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return self.subscribe_headers_result(self.height())
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async def add_peer(self, features):
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'''Add a peer (but only if the peer resolves to the source).'''
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peer_mgr = self.controller.peer_mgr
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return await peer_mgr.on_add_peer(features, self.peer_address())
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def peers_subscribe(self):
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'''Return the server peers as a list of (ip, host, details) tuples.'''
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return self.controller.peer_mgr.on_peers_subscribe(self.is_tor())
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async def address_status(self, hashX):
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'''Returns an address status.
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Status is a hex string, but must be None if there is no history.
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'''
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# Note history is ordered and mempool unordered in electrum-server
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# For mempool, height is -1 if unconfirmed txins, otherwise 0
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history = await self.controller.get_history(hashX)
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mempool = await self.controller.mempool_transactions(hashX)
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status = ''.join('{}:{:d}:'.format(hash_to_str(tx_hash), height)
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for tx_hash, height in history)
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status += ''.join('{}:{:d}:'.format(hex_hash, -unconfirmed)
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for hex_hash, tx_fee, unconfirmed in mempool)
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if status:
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status = sha256(status.encode()).hex()
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else:
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status = None
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if mempool:
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self.mempool_statuses[hashX] = status
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else:
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self.mempool_statuses.pop(hashX, None)
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return status
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async def hashX_subscribe(self, hashX, alias):
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# First check our limit.
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if len(self.hashX_subs) >= self.max_subs:
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raise RPCError(BAD_REQUEST, 'your address subscription limit '
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f'{self.max_subs:,d} reached')
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# Now let the controller check its limit
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self.controller.new_subscription()
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self.hashX_subs[hashX] = alias
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return await self.address_status(hashX)
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async def address_subscribe(self, address):
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'''Subscribe to an address.
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address: the address to subscribe to'''
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hashX = self.controller.address_to_hashX(address)
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return await self.hashX_subscribe(hashX, address)
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async def scripthash_subscribe(self, scripthash):
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'''Subscribe to a script hash.
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scripthash: the SHA256 hash of the script to subscribe to'''
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hashX = self.controller.scripthash_to_hashX(scripthash)
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return await self.hashX_subscribe(hashX, scripthash)
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def block_headers(self, start_height, count):
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'''Return count concatenated block headers as hex for the main chain;
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starting at start_height.
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start_height and count must be non-negative integers. At most
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MAX_CHUNK_SIZE headers will be returned.
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'''
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start_height = self.controller.non_negative_integer(start_height)
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count = self.controller.non_negative_integer(count)
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count = min(count, self.MAX_CHUNK_SIZE)
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hex_str, n = self.controller.block_headers(start_height, count)
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return {'hex': hex_str, 'count': n, 'max': self.MAX_CHUNK_SIZE}
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def block_get_chunk(self, index):
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'''Return a chunk of block headers as a hexadecimal string.
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index: the chunk index'''
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index = self.controller.non_negative_integer(index)
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chunk_size = self.controller.coin.CHUNK_SIZE
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start_height = index * chunk_size
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hex_str, n = self.controller.block_headers(start_height, chunk_size)
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return hex_str
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def is_tor(self):
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'''Try to detect if the connection is to a tor hidden service we are
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running.'''
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peername = self.controller.peer_mgr.proxy_peername()
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if not peername:
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return False
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peer_address = self.peer_address()
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return peer_address and peer_address[0] == peername[0]
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async def replaced_banner(self, banner):
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network_info = await self.controller.daemon_request('getnetworkinfo')
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ni_version = network_info['version']
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major, minor = divmod(ni_version, 1000000)
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minor, revision = divmod(minor, 10000)
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revision //= 100
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daemon_version = '{:d}.{:d}.{:d}'.format(major, minor, revision)
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for pair in [
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('$SERVER_VERSION', self.controller.short_version()),
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('$SERVER_SUBVERSION', self.controller.VERSION),
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('$DAEMON_VERSION', daemon_version),
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('$DAEMON_SUBVERSION', network_info['subversion']),
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('$DONATION_ADDRESS', self.env.donation_address),
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]:
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banner = banner.replace(*pair)
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return banner
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def donation_address(self):
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'''Return the donation address as a string, empty if there is none.'''
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return self.env.donation_address
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async def banner(self):
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'''Return the server banner text.'''
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banner = 'Welcome to Electrum!'
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if self.is_tor():
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banner_file = self.env.tor_banner_file
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else:
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banner_file = self.env.banner_file
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if banner_file:
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try:
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with codecs.open(banner_file, 'r', 'utf-8') as f:
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banner = f.read()
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except Exception as e:
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self.logger.error(f'reading banner file {banner_file}: {e}')
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else:
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banner = await self.replaced_banner(banner)
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return banner
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def ping(self):
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'''Serves as a connection keep-alive mechanism and for the client to
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confirm the server is still responding.
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'''
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return None
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def server_version(self, client_name=None, protocol_version=None):
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'''Returns the server version as a string.
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client_name: a string identifying the client
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protocol_version: the protocol version spoken by the client
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'''
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if client_name:
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if self.env.drop_client is not None and \
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self.env.drop_client.match(client_name):
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self.close_after_send = True
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raise RPCError(BAD_REQUEST,
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f'unsupported client: {client_name}')
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self.client = str(client_name)[:17]
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try:
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self.client_version = tuple(int(part) for part
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in self.client.split('.'))
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except Exception:
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pass
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# Find the highest common protocol version. Disconnect if
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# that protocol version in unsupported.
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ptuple = self.controller.protocol_tuple(protocol_version)
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if ptuple is None:
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self.logger.info('unsupported protocol version request {}'
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.format(protocol_version))
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self.close_after_send = True
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raise RPCError(BAD_REQUEST,
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f'unsupported protocol version: {protocol_version}')
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self.set_protocol_handlers(ptuple)
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return (self.controller.VERSION, self.protocol_version)
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async def transaction_broadcast(self, raw_tx):
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'''Broadcast a raw transaction to the network.
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raw_tx: the raw transaction as a hexadecimal string'''
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# This returns errors as JSON RPC errors, as is natural
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try:
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tx_hash = await self.daemon.sendrawtransaction([raw_tx])
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self.txs_sent += 1
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self.logger.info('sent tx: {}'.format(tx_hash))
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self.controller.sent_tx(tx_hash)
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return tx_hash
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except DaemonError as e:
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error, = e.args
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message = error['message']
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self.logger.info('sendrawtransaction: {}'.format(message))
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raise RPCError(BAD_REQUEST, 'the transaction was rejected by '
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f'network rules.\n\n{message}\n[{raw_tx}]')
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def set_protocol_handlers(self, ptuple):
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protocol_version = '.'.join(str(part) for part in ptuple)
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if protocol_version == self.protocol_version:
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return
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self.protocol_version = protocol_version
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controller = self.controller
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handlers = {
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'blockchain.address.get_balance': controller.address_get_balance,
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'blockchain.address.get_history': controller.address_get_history,
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'blockchain.address.get_mempool': controller.address_get_mempool,
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'blockchain.address.listunspent': controller.address_listunspent,
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'blockchain.address.subscribe': self.address_subscribe,
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'blockchain.block.get_chunk': self.block_get_chunk,
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'blockchain.block.get_header': controller.block_get_header,
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'blockchain.estimatefee': controller.estimatefee,
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'blockchain.headers.subscribe': self.headers_subscribe,
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'blockchain.relayfee': controller.relayfee,
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'blockchain.scripthash.get_balance':
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controller.scripthash_get_balance,
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'blockchain.scripthash.get_history':
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controller.scripthash_get_history,
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'blockchain.scripthash.get_mempool':
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controller.scripthash_get_mempool,
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'blockchain.scripthash.listunspent':
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controller.scripthash_listunspent,
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'blockchain.scripthash.subscribe': self.scripthash_subscribe,
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'blockchain.transaction.broadcast': self.transaction_broadcast,
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'blockchain.transaction.get': controller.transaction_get,
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'blockchain.transaction.get_merkle':
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controller.transaction_get_merkle,
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'server.add_peer': self.add_peer,
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'server.banner': self.banner,
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'server.donation_address': self.donation_address,
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'server.features': self.controller.server_features,
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'server.peers.subscribe': self.peers_subscribe,
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'server.version': self.server_version,
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}
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if ptuple >= (1, 2):
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# New handler as of 1.2
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handlers.update({
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'mempool.get_fee_histogram':
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controller.mempool_get_fee_histogram,
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'blockchain.block.headers': self.block_headers,
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'server.ping': self.ping,
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})
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self.electrumx_handlers = handlers
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def request_handler(self, method):
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'''Return the async handler for the given request method.'''
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return self.electrumx_handlers.get(method)
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class LocalRPC(SessionBase):
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'''A local TCP RPC server session.'''
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.client = 'RPC'
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self.max_response_size = 0
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self.protocol_version = 'RPC'
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def request_handler(self, method):
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'''Return the async handler for the given request method.'''
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return self.controller.rpc_handlers.get(method)
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class DashElectrumX(ElectrumX):
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'''A TCP server that handles incoming Electrum Dash connections.'''
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.mns = set()
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def set_protocol_handlers(self, ptuple):
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super().set_protocol_handlers(ptuple)
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self.electrumx_handlers.update({
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'masternode.announce.broadcast':
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self.masternode_announce_broadcast,
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|
'masternode.subscribe': self.masternode_subscribe,
|
|
'masternode.list': self.masternode_list
|
|
})
|
|
|
|
async def notify_masternodes_async(self):
|
|
for masternode in self.mns:
|
|
status = await self.daemon.masternode_list(['status', masternode])
|
|
self.send_notification('masternode.subscribe',
|
|
[masternode, status.get(masternode)])
|
|
|
|
def notify(self, height, touched):
|
|
'''Notify the client about changes in masternode list.'''
|
|
result = super().notify(height, touched)
|
|
self.controller.create_task(self.notify_masternodes_async())
|
|
return result
|
|
|
|
# Masternode command handlers
|
|
async def masternode_announce_broadcast(self, signmnb):
|
|
'''Pass through the masternode announce message to be broadcast
|
|
by the daemon.
|
|
|
|
signmnb: signed masternode broadcast message.'''
|
|
try:
|
|
return await self.daemon.masternode_broadcast(['relay', signmnb])
|
|
except DaemonError as e:
|
|
error, = e.args
|
|
message = error['message']
|
|
self.logger.info('masternode_broadcast: {}'.format(message))
|
|
raise RPCError(BAD_REQUEST, 'the masternode broadcast was '
|
|
f'rejected.\n\n{message}\n[{signmnb}]')
|
|
|
|
async def masternode_subscribe(self, collateral):
|
|
'''Returns the status of masternode.
|
|
|
|
collateral: masternode collateral.
|
|
'''
|
|
result = await self.daemon.masternode_list(['status', collateral])
|
|
if result is not None:
|
|
self.mns.add(collateral)
|
|
return result.get(collateral)
|
|
return None
|
|
|
|
async def masternode_list(self, payees):
|
|
'''
|
|
Returns the list of masternodes.
|
|
|
|
payees: a list of masternode payee addresses.
|
|
'''
|
|
if not isinstance(payees, list):
|
|
raise RPCError(BAD_REQUEST, 'expected a list of payees')
|
|
|
|
result = []
|
|
|
|
def get_masternode_payment_queue(mns):
|
|
'''Returns the calculated position in the payment queue for all the
|
|
valid masterernodes in the given mns list.
|
|
|
|
mns: a list of masternodes information.
|
|
'''
|
|
now = int(datetime.datetime.utcnow().strftime("%s"))
|
|
mn_queue = []
|
|
|
|
# Only ENABLED masternodes are considered for the list.
|
|
for line in mns:
|
|
mnstat = mns[line].split()
|
|
if mnstat[0] == 'ENABLED':
|
|
# if last paid time == 0
|
|
if int(mnstat[5]) == 0:
|
|
# use active seconds
|
|
mnstat.append(int(mnstat[4]))
|
|
else:
|
|
# now minus last paid
|
|
delta = now - int(mnstat[5])
|
|
# if > active seconds, use active seconds
|
|
if delta >= int(mnstat[4]):
|
|
mnstat.append(int(mnstat[4]))
|
|
# use active seconds
|
|
else:
|
|
mnstat.append(delta)
|
|
mn_queue.append(mnstat)
|
|
mn_queue = sorted(mn_queue, key=lambda x: x[8], reverse=True)
|
|
return mn_queue
|
|
|
|
def get_payment_position(payment_queue, address):
|
|
'''
|
|
Returns the position of the payment list for the given address.
|
|
|
|
payment_queue: position in the payment queue for the masternode.
|
|
address: masternode payee address.
|
|
'''
|
|
position = -1
|
|
for pos, mn in enumerate(payment_queue, start=1):
|
|
if mn[2] == address:
|
|
position = pos
|
|
break
|
|
return position
|
|
|
|
# Accordingly with the masternode payment queue, a custom list
|
|
# with the masternode information including the payment
|
|
# position is returned.
|
|
if (self.controller.cache_mn_height != self.height()
|
|
or not self.controller.mn_cache):
|
|
self.controller.cache_mn_height = self.height()
|
|
self.controller.mn_cache.clear()
|
|
full_mn_list = await self.daemon.masternode_list(['full'])
|
|
mn_payment_queue = get_masternode_payment_queue(full_mn_list)
|
|
mn_payment_count = len(mn_payment_queue)
|
|
mn_list = []
|
|
for key, value in full_mn_list.items():
|
|
mn_data = value.split()
|
|
mn_info = {}
|
|
mn_info['vin'] = key
|
|
mn_info['status'] = mn_data[0]
|
|
mn_info['protocol'] = mn_data[1]
|
|
mn_info['payee'] = mn_data[2]
|
|
mn_info['lastseen'] = mn_data[3]
|
|
mn_info['activeseconds'] = mn_data[4]
|
|
mn_info['lastpaidtime'] = mn_data[5]
|
|
mn_info['lastpaidblock'] = mn_data[6]
|
|
mn_info['ip'] = mn_data[7]
|
|
mn_info['paymentposition'] = get_payment_position(
|
|
mn_payment_queue, mn_info['payee'])
|
|
mn_info['inselection'] = (
|
|
mn_info['paymentposition'] < mn_payment_count // 10)
|
|
balance = await self.controller.address_get_balance(
|
|
mn_info['payee'])
|
|
mn_info['balance'] = (sum(balance.values())
|
|
/ self.controller.coin.VALUE_PER_COIN)
|
|
mn_list.append(mn_info)
|
|
self.controller.mn_cache = mn_list
|
|
|
|
# If payees is an empty list the whole masternode list is returned
|
|
if payees:
|
|
result = [mn for mn in self.controller.mn_cache
|
|
for address in payees if mn['payee'] == address]
|
|
else:
|
|
result = self.controller.mn_cache
|
|
|
|
return result
|
|
|