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1038 lines
40 KiB
1038 lines
40 KiB
# Copyright (c) 2016, 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 asyncio
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import codecs
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import json
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import os
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import ssl
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import time
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import traceback
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from bisect import bisect_left
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from collections import defaultdict, namedtuple
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from functools import partial
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import pylru
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from lib.hash import sha256, double_sha256, hash_to_str, hex_str_to_hash
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from lib.jsonrpc import JSONRPC, RequestBase
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import lib.util as util
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from server.block_processor import BlockProcessor
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from server.daemon import DaemonError
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from server.irc import IRC
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from server.mempool import MemPool
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from server.version import VERSION
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class ServerManager(util.LoggedClass):
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'''Manages the client servers, a mempool, and a block processor.
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Servers are started immediately the block processor first catches
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up with the daemon.
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'''
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BANDS = 5
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CATCHING_UP, LISTENING, PAUSED, SHUTTING_DOWN = range(4)
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class NotificationRequest(RequestBase):
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def __init__(self, height, touched):
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super().__init__(1)
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self.height = height
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self.touched = touched
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async def process(self, session):
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self.remaining = 0
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await session.notify(self.height, self.touched)
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def __init__(self, env):
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super().__init__()
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self.loop = asyncio.get_event_loop()
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self.start = time.time()
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self.bp = BlockProcessor(env)
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self.mempool = MemPool(self.bp.daemon, env.coin, self.bp)
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self.irc = IRC(env)
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self.env = env
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self.servers = {}
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self.sessions = {}
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self.groups = defaultdict(set)
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self.txs_sent = 0
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self.next_log_sessions = 0
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self.state = self.CATCHING_UP
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self.max_sessions = env.max_sessions
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self.low_watermark = self.max_sessions * 19 // 20
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self.max_subs = env.max_subs
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self.subscription_count = 0
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self.next_stale_check = 0
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self.history_cache = pylru.lrucache(256)
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self.header_cache = pylru.lrucache(8)
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self.queue = asyncio.PriorityQueue()
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self.delayed_sessions = []
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self.next_queue_id = 0
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self.height = 0
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self.futures = []
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env.max_send = max(350000, env.max_send)
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self.setup_bands()
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async def mempool_transactions(self, hash168):
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'''Generate (hex_hash, tx_fee, unconfirmed) tuples for mempool
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entries for the hash168.
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unconfirmed is True if any txin is unconfirmed.
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'''
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return await self.mempool.transactions(hash168)
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def mempool_value(self, hash168):
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'''Return the unconfirmed amount in the mempool for hash168.
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Can be positive or negative.
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'''
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return self.mempool.value(hash168)
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def sent_tx(self, tx_hash):
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'''Call when a TX is sent. Tells mempool to prioritize it.'''
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self.txs_sent += 1
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self.mempool.prioritize(tx_hash)
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def setup_bands(self):
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bands = []
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limit = self.env.bandwidth_limit
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for n in range(self.BANDS):
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bands.append(limit)
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limit //= 4
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limit = self.env.bandwidth_limit
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for n in range(self.BANDS):
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limit += limit // 2
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bands.append(limit)
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self.bands = sorted(bands)
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def session_priority(self, session):
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if isinstance(session, LocalRPC):
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return 0
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group_bandwidth = sum(s.bandwidth_used for s in self.sessions[session])
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return 1 + (bisect_left(self.bands, session.bandwidth_used)
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+ bisect_left(self.bands, group_bandwidth) + 1) // 2
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def is_deprioritized(self, session):
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return self.session_priority(session) > self.BANDS
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async def enqueue_delayed_sessions(self):
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while True:
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now = time.time()
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keep = []
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for pair in self.delayed_sessions:
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timeout, item = pair
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priority, queue_id, session = item
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if not session.pause and timeout <= now:
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self.queue.put_nowait(item)
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else:
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keep.append(pair)
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self.delayed_sessions = keep
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# If paused and session count has fallen, start listening again
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if (len(self.sessions) <= self.low_watermark
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and self.state == self.PAUSED):
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await self.start_external_servers()
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await asyncio.sleep(1)
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def enqueue_session(self, session):
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# Might have disconnected whilst waiting
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if not session in self.sessions:
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return
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priority = self.session_priority(session)
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item = (priority, self.next_queue_id, session)
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self.next_queue_id += 1
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excess = max(0, priority - self.BANDS)
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if excess != session.last_delay:
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session.last_delay = excess
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if excess:
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session.log_info('high bandwidth use, deprioritizing by '
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'delaying responses {:d}s'.format(excess))
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else:
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session.log_info('stopped delaying responses')
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delay = max(int(session.pause), excess)
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if delay:
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self.delayed_sessions.append((time.time() + delay, item))
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else:
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self.queue.put_nowait(item)
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async def serve_requests(self):
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'''Asynchronously run through the task queue.'''
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while True:
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priority_, id_, session = await self.queue.get()
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if session in self.sessions:
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await session.serve_requests()
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async def main_loop(self):
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'''Server manager main loop.'''
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def add_future(coro):
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self.futures.append(asyncio.ensure_future(coro))
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# shutdown() assumes bp.main_loop() is first
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add_future(self.bp.main_loop(self.mempool.touched))
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add_future(self.bp.prefetcher.main_loop(self.bp.caught_up_event))
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add_future(self.irc.start(self.bp.caught_up_event))
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add_future(self.start_servers(self.bp.caught_up_event))
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add_future(self.mempool.main_loop())
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add_future(self.enqueue_delayed_sessions())
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add_future(self.notify())
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for n in range(4):
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add_future(self.serve_requests())
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for future in asyncio.as_completed(self.futures):
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try:
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await future # Note: future is not one of self.futures
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except asyncio.CancelledError:
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break
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await self.shutdown()
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await asyncio.sleep(1)
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def close_servers(self, kinds):
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'''Close the servers of the given kinds (TCP etc.).'''
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for kind in kinds:
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server = self.servers.pop(kind, None)
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if server:
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server.close()
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# Don't bother awaiting the close - we're not async
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async def start_server(self, kind, *args, **kw_args):
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protocol_class = LocalRPC if kind == 'RPC' else ElectrumX
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protocol = partial(protocol_class, self, self.bp, self.env, kind)
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server = self.loop.create_server(protocol, *args, **kw_args)
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host, port = args[:2]
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try:
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self.servers[kind] = await server
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except Exception as e:
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self.logger.error('{} server failed to listen on {}:{:d} :{}'
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.format(kind, host, port, e))
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else:
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self.logger.info('{} server listening on {}:{:d}'
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.format(kind, host, port))
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async def start_servers(self, caught_up):
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'''Start RPC, TCP and SSL servers once caught up.'''
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if self.env.rpc_port is not None:
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await self.start_server('RPC', 'localhost', self.env.rpc_port)
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await caught_up.wait()
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self.logger.info('max session count: {:,d}'.format(self.max_sessions))
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self.logger.info('session timeout: {:,d} seconds'
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.format(self.env.session_timeout))
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self.logger.info('session bandwidth limit {:,d} bytes'
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.format(self.env.bandwidth_limit))
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self.logger.info('max response size {:,d} bytes'
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.format(self.env.max_send))
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self.logger.info('max subscriptions across all sessions: {:,d}'
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.format(self.max_subs))
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self.logger.info('max subscriptions per session: {:,d}'
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.format(self.env.max_session_subs))
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self.logger.info('bands: {}'.format(self.bands))
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await self.start_external_servers()
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async def start_external_servers(self):
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'''Start listening on TCP and SSL ports, but only if the respective
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port was given in the environment.
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'''
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self.state = self.LISTENING
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env= self.env
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if env.tcp_port is not None:
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await self.start_server('TCP', env.host, env.tcp_port)
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if env.ssl_port is not None:
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# Python 3.5.3: use PROTOCOL_TLS
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sslc = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
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sslc.load_cert_chain(env.ssl_certfile, keyfile=env.ssl_keyfile)
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await self.start_server('SSL', env.host, env.ssl_port, ssl=sslc)
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async def notify(self):
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'''Notify sessions about height changes and touched addresses.'''
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while True:
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await self.mempool.touched_event.wait()
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touched = self.mempool.touched.copy()
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self.mempool.touched.clear()
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self.mempool.touched_event.clear()
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# Invalidate caches
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hc = self.history_cache
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for hash168 in set(hc).intersection(touched):
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del hc[hash168]
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if self.bp.db_height != self.height:
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self.height = self.bp.db_height
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self.header_cache.clear()
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for session in self.sessions:
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if isinstance(session, ElectrumX):
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request = self.NotificationRequest(self.bp.db_height,
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touched)
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session.enqueue_request(request)
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# Periodically log sessions
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if self.env.log_sessions and time.time() > self.next_log_sessions:
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if self.next_log_sessions:
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data = self.session_data(for_log=True)
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for line in ServerManager.sessions_text_lines(data):
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self.logger.info(line)
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self.logger.info(json.dumps(self.server_summary()))
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self.next_log_sessions = time.time() + self.env.log_sessions
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def electrum_header(self, height):
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'''Return the binary header at the given height.'''
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if not 0 <= height <= self.bp.db_height:
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raise JSONRPC.RPCError('height {:,d} out of range'.format(height))
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if height in self.header_cache:
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return self.header_cache[height]
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header = self.bp.read_headers(height, 1)
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header = self.env.coin.electrum_header(header, height)
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self.header_cache[height] = header
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return header
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async def async_get_history(self, hash168):
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'''Get history asynchronously to reduce latency.'''
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if hash168 in self.history_cache:
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return self.history_cache[hash168]
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def job():
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# History DoS limit. Each element of history is about 99
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# bytes when encoded as JSON. This limits resource usage
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# on bloated history requests, and uses a smaller divisor
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# so large requests are logged before refusing them.
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limit = self.env.max_send // 97
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return list(self.bp.get_history(hash168, limit=limit))
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loop = asyncio.get_event_loop()
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history = await loop.run_in_executor(None, job)
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self.history_cache[hash168] = history
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return history
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async def shutdown(self):
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'''Call to shutdown everything. Returns when done.'''
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self.state = self.SHUTTING_DOWN
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self.close_servers(list(self.servers.keys()))
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# Don't cancel the block processor main loop - let it close itself
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for future in self.futures[1:]:
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future.cancel()
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if self.sessions:
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await self.close_sessions()
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await self.futures[0]
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async def close_sessions(self, secs=30):
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self.logger.info('cleanly closing client sessions, please wait...')
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for session in self.sessions:
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self.close_session(session)
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self.logger.info('listening sockets closed, waiting up to '
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'{:d} seconds for socket cleanup'.format(secs))
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limit = time.time() + secs
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while self.sessions and time.time() < limit:
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self.clear_stale_sessions(grace=secs//2)
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await asyncio.sleep(2)
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self.logger.info('{:,d} sessions remaining'
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.format(len(self.sessions)))
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def add_session(self, session):
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now = time.time()
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if now > self.next_stale_check:
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self.next_stale_check = now + 300
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self.clear_stale_sessions()
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group = self.groups[int(session.start - self.start) // 900]
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group.add(session)
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self.sessions[session] = group
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session.log_info('{} {}, {:,d} total'
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.format(session.kind, session.peername(),
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len(self.sessions)))
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if (len(self.sessions) >= self.max_sessions
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and self.state == self.LISTENING):
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self.state = self.PAUSED
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session.log_info('maximum sessions {:,d} reached, stopping new '
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'connections until count drops to {:,d}'
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.format(self.max_sessions, self.low_watermark))
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self.close_servers(['TCP', 'SSL'])
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def remove_session(self, session):
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'''Remove a session from our sessions list if there.'''
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if session in self.sessions:
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group = self.sessions.pop(session)
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group.remove(session)
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self.subscription_count -= session.sub_count()
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def close_session(self, session):
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'''Close the session's transport and cancel its future.'''
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session.close_connection()
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return 'disconnected {:d}'.format(session.id_)
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def toggle_logging(self, session):
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'''Toggle logging of the session.'''
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session.log_me = not session.log_me
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return 'log {:d}: {}'.format(session.id_, session.log_me)
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def clear_stale_sessions(self, grace=15):
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'''Cut off sessions that haven't done anything for 10 minutes. Force
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close stubborn connections that won't close cleanly after a
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short grace period.
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'''
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now = time.time()
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shutdown_cutoff = now - grace
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stale_cutoff = now - self.env.session_timeout
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stale = []
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for session in self.sessions:
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if session.is_closing():
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if session.stop <= shutdown_cutoff:
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session.transport.abort()
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elif session.last_recv < stale_cutoff:
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self.close_session(session)
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stale.append(session.id_)
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if stale:
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self.logger.info('closing stale connections {}'.format(stale))
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# Consolidate small groups
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keys = [k for k, v in self.groups.items() if len(v) <= 4
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and sum(session.bandwidth_used for session in v) < 10000]
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if len(keys) > 1:
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group = set.union(*(self.groups[key] for key in keys))
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for key in keys:
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del self.groups[key]
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self.groups[max(keys)] = group
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def new_subscription(self):
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if self.subscription_count >= self.max_subs:
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raise JSONRPC.RPCError('server subscription limit {:,d} reached'
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.format(self.max_subs))
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self.subscription_count += 1
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def irc_peers(self):
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return self.irc.peers
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def session_count(self):
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'''The number of connections that we've sent something to.'''
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return len(self.sessions)
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def server_summary(self):
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'''A one-line summary of server state.'''
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return {
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'daemon_height': self.bp.daemon.cached_height(),
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'db_height': self.bp.db_height,
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'closing': len([s for s in self.sessions if s.is_closing()]),
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'errors': sum(s.error_count for s in self.sessions),
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'groups': len(self.groups),
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'logged': len([s for s in self.sessions if s.log_me]),
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'paused': sum(s.pause for s in self.sessions),
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'pid': os.getpid(),
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'peers': len(self.irc.peers),
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'requests': sum(s.requests_remaining() for s in self.sessions),
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'sessions': self.session_count(),
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'subs': self.subscription_count,
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'txs_sent': self.txs_sent,
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}
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@staticmethod
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def text_lines(method, data):
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if method == 'sessions':
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return ServerManager.sessions_text_lines(data)
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else:
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return ServerManager.groups_text_lines(data)
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@staticmethod
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def groups_text_lines(data):
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'''A generator returning lines for a list of groups.
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data is the return value of rpc_groups().'''
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fmt = ('{:<6} {:>9} {:>9} {:>6} {:>6} {:>8}'
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'{:>7} {:>9} {:>7} {:>9}')
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yield fmt.format('ID', 'Sessions', 'Bwidth KB', 'Reqs', 'Txs', 'Subs',
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'Recv', 'Recv KB', 'Sent', 'Sent KB')
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for (id_, session_count, bandwidth, reqs, txs_sent, subs,
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recv_count, recv_size, send_count, send_size) in data:
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yield fmt.format(id_,
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'{:,d}'.format(session_count),
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'{:,d}'.format(bandwidth // 1024),
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'{:,d}'.format(reqs),
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'{:,d}'.format(txs_sent),
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'{:,d}'.format(subs),
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'{:,d}'.format(recv_count),
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'{:,d}'.format(recv_size // 1024),
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'{:,d}'.format(send_count),
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'{:,d}'.format(send_size // 1024))
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def group_data(self):
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'''Returned to the RPC 'groups' call.'''
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result = []
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for group_id in sorted(self.groups.keys()):
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sessions = self.groups[group_id]
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result.append([group_id,
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len(sessions),
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sum(s.bandwidth_used for s in sessions),
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sum(s.requests_remaining() for s in sessions),
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sum(s.txs_sent for s in sessions),
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sum(s.sub_count() for s in sessions),
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sum(s.recv_count for s in sessions),
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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
|
|
|
|
@staticmethod
|
|
def sessions_text_lines(data):
|
|
'''A generator returning lines for a list of sessions.
|
|
|
|
data is the return value of rpc_sessions().'''
|
|
|
|
def time_fmt(t):
|
|
t = int(t)
|
|
return ('{:3d}:{:02d}:{:02d}'
|
|
.format(t // 3600, (t % 3600) // 60, t % 60))
|
|
|
|
fmt = ('{:<6} {:<5} {:>15} {:>5} {:>5} '
|
|
'{:>7} {:>7} {:>7} {:>7} {:>7} {:>9} {:>21}')
|
|
yield fmt.format('ID', 'Flags', 'Client', 'Reqs', 'Txs', 'Subs',
|
|
'Recv', 'Recv KB', 'Sent', 'Sent KB', 'Time', 'Peer')
|
|
for (id_, flags, peer, client, reqs, txs_sent, subs,
|
|
recv_count, recv_size, send_count, send_size, time) in data:
|
|
yield fmt.format(id_, flags, client,
|
|
'{:,d}'.format(reqs),
|
|
'{:,d}'.format(txs_sent),
|
|
'{:,d}'.format(subs),
|
|
'{:,d}'.format(recv_count),
|
|
'{:,d}'.format(recv_size // 1024),
|
|
'{:,d}'.format(send_count),
|
|
'{:,d}'.format(send_size // 1024),
|
|
time_fmt(time), peer)
|
|
|
|
def session_data(self, for_log):
|
|
'''Returned to the RPC 'sessions' call.'''
|
|
now = time.time()
|
|
sessions = sorted(self.sessions, key=lambda s: s.start)
|
|
return [(session.id_,
|
|
session.flags(),
|
|
session.peername(for_log=for_log),
|
|
session.client,
|
|
session.requests_remaining(),
|
|
session.txs_sent,
|
|
session.sub_count(),
|
|
session.recv_count, session.recv_size,
|
|
session.send_count, session.send_size,
|
|
now - session.start)
|
|
for session in sessions]
|
|
|
|
def lookup_session(self, param):
|
|
try:
|
|
id_ = int(param)
|
|
except:
|
|
pass
|
|
else:
|
|
for session in self.sessions:
|
|
if session.id_ == id_:
|
|
return session
|
|
return None
|
|
|
|
def for_each_session(self, params, operation):
|
|
result = []
|
|
for param in params:
|
|
session = self.lookup_session(param)
|
|
if session:
|
|
result.append(operation(session))
|
|
else:
|
|
result.append('unknown session: {}'.format(param))
|
|
return result
|
|
|
|
async def rpc_disconnect(self, params):
|
|
return self.for_each_session(params, self.close_session)
|
|
|
|
async def rpc_log(self, params):
|
|
return self.for_each_session(params, self.toggle_logging)
|
|
|
|
async def rpc_getinfo(self, params):
|
|
return self.server_summary()
|
|
|
|
async def rpc_groups(self, params):
|
|
return self.group_data()
|
|
|
|
async def rpc_sessions(self, params):
|
|
return self.session_data(for_log=False)
|
|
|
|
async def rpc_peers(self, params):
|
|
return self.irc.peers
|
|
|
|
|
|
class Session(JSONRPC):
|
|
'''Base class of ElectrumX JSON session protocols.
|
|
|
|
Each session runs its tasks in asynchronous parallelism with other
|
|
sessions. To prevent some sessions blocking others, potentially
|
|
long-running requests should yield.
|
|
'''
|
|
|
|
def __init__(self, manager, bp, env, kind):
|
|
super().__init__()
|
|
self.manager = manager
|
|
self.bp = bp
|
|
self.env = env
|
|
self.daemon = bp.daemon
|
|
self.coin = bp.coin
|
|
self.kind = kind
|
|
self.client = 'unknown'
|
|
self.anon_logs = env.anon_logs
|
|
self.max_send = env.max_send
|
|
self.bandwidth_limit = env.bandwidth_limit
|
|
self.last_delay = 0
|
|
self.txs_sent = 0
|
|
self.requests = []
|
|
|
|
def is_closing(self):
|
|
'''True if this session is closing.'''
|
|
return self.transport and self.transport.is_closing()
|
|
|
|
def flags(self):
|
|
'''Status flags.'''
|
|
status = self.kind[0]
|
|
if self.is_closing():
|
|
status += 'C'
|
|
if self.log_me:
|
|
status += 'L'
|
|
status += str(self.manager.session_priority(self))
|
|
return status
|
|
|
|
def requests_remaining(self):
|
|
return sum(request.remaining for request in self.requests)
|
|
|
|
def enqueue_request(self, request):
|
|
'''Add a request to the session's list.'''
|
|
self.requests.append(request)
|
|
if len(self.requests) == 1:
|
|
self.manager.enqueue_session(self)
|
|
|
|
async def serve_requests(self):
|
|
'''Serve requests in batches.'''
|
|
total = 0
|
|
errs = []
|
|
# Process 8 items at a time
|
|
for request in self.requests:
|
|
try:
|
|
initial = request.remaining
|
|
await request.process(self)
|
|
total += initial - request.remaining
|
|
except asyncio.CancelledError:
|
|
raise
|
|
except Exception:
|
|
# Should probably be considered a bug and fixed
|
|
self.log_error('error handling request {}'.format(request))
|
|
traceback.print_exc()
|
|
errs.append(request)
|
|
await asyncio.sleep(0)
|
|
if total >= 8:
|
|
break
|
|
|
|
# Remove completed requests and re-enqueue ourself if any remain.
|
|
self.requests = [req for req in self.requests
|
|
if req.remaining and not req in errs]
|
|
if self.requests:
|
|
self.manager.enqueue_session(self)
|
|
|
|
def connection_made(self, transport):
|
|
'''Handle an incoming client connection.'''
|
|
super().connection_made(transport)
|
|
self.manager.add_session(self)
|
|
|
|
def connection_lost(self, exc):
|
|
'''Handle client disconnection.'''
|
|
super().connection_lost(exc)
|
|
if (self.pause or self.manager.is_deprioritized(self)
|
|
or self.send_size >= 1024*1024 or self.error_count):
|
|
self.log_info('disconnected. Sent {:,d} bytes in {:,d} messages '
|
|
'{:,d} errors'
|
|
.format(self.send_size, self.send_count,
|
|
self.error_count))
|
|
self.manager.remove_session(self)
|
|
|
|
async def handle_request(self, method, params):
|
|
'''Handle a request.'''
|
|
handler = self.handlers.get(method)
|
|
if not handler:
|
|
self.raise_unknown_method(method)
|
|
|
|
return await handler(params)
|
|
|
|
def sub_count(self):
|
|
return 0
|
|
|
|
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 self.RPCError('daemon error: {}'.format(e))
|
|
|
|
def param_to_tx_hash(self, param):
|
|
'''Raise an RPCError if the parameter is not a valid transaction
|
|
hash.'''
|
|
if isinstance(param, str) and len(param) == 64:
|
|
try:
|
|
bytes.fromhex(param)
|
|
return param
|
|
except ValueError:
|
|
pass
|
|
raise self.RPCError('parameter should be a transaction hash: {}'
|
|
.format(param))
|
|
|
|
def param_to_hash168(self, param):
|
|
if isinstance(param, str):
|
|
try:
|
|
return self.coin.address_to_hash168(param)
|
|
except:
|
|
pass
|
|
raise self.RPCError('param {} is not a valid address'.format(param))
|
|
|
|
def params_to_hash168(self, params):
|
|
if len(params) == 1:
|
|
return self.param_to_hash168(params[0])
|
|
raise self.RPCError('params {} should contain a single address'
|
|
.format(params))
|
|
|
|
|
|
class ElectrumX(Session):
|
|
'''A TCP server that handles incoming Electrum connections.'''
|
|
|
|
def __init__(self, *args):
|
|
super().__init__(*args)
|
|
self.subscribe_headers = False
|
|
self.subscribe_height = False
|
|
self.notified_height = None
|
|
self.max_subs = self.env.max_session_subs
|
|
self.hash168s = set()
|
|
rpcs = [
|
|
('blockchain',
|
|
'address.get_balance address.get_history address.get_mempool '
|
|
'address.get_proof address.listunspent address.subscribe '
|
|
'block.get_header block.get_chunk estimatefee headers.subscribe '
|
|
'numblocks.subscribe relayfee transaction.broadcast '
|
|
'transaction.get transaction.get_merkle utxo.get_address'),
|
|
('server',
|
|
'banner donation_address peers.subscribe version'),
|
|
]
|
|
self.handlers = {'.'.join([prefix, suffix]):
|
|
getattr(self, suffix.replace('.', '_'))
|
|
for prefix, suffixes in rpcs
|
|
for suffix in suffixes.split()}
|
|
|
|
def sub_count(self):
|
|
return len(self.hash168s)
|
|
|
|
async def notify(self, height, touched):
|
|
'''Notify the client about changes in height and touched addresses.
|
|
|
|
Cache is a shared cache for this update.
|
|
'''
|
|
if height != self.notified_height:
|
|
self.notified_height = height
|
|
if self.subscribe_headers:
|
|
payload = self.notification_payload(
|
|
'blockchain.headers.subscribe',
|
|
(self.manager.electrum_header(height), ),
|
|
)
|
|
self.encode_and_send_payload(payload)
|
|
|
|
if self.subscribe_height:
|
|
payload = self.notification_payload(
|
|
'blockchain.numblocks.subscribe',
|
|
(height, ),
|
|
)
|
|
self.encode_and_send_payload(payload)
|
|
|
|
hash168_to_address = self.coin.hash168_to_address
|
|
matches = self.hash168s.intersection(touched)
|
|
for hash168 in matches:
|
|
address = hash168_to_address(hash168)
|
|
status = await self.address_status(hash168)
|
|
payload = self.notification_payload(
|
|
'blockchain.address.subscribe', (address, status))
|
|
self.encode_and_send_payload(payload)
|
|
|
|
if matches:
|
|
self.log_info('notified of {:,d} addresses'.format(len(matches)))
|
|
|
|
def height(self):
|
|
'''Return the current flushed database height.'''
|
|
return self.bp.db_height
|
|
|
|
def current_electrum_header(self):
|
|
'''Used as response to a headers subscription request.'''
|
|
return self.manager.electrum_header(self.height())
|
|
|
|
async def address_status(self, hash168):
|
|
'''Returns status as 32 bytes.'''
|
|
# Note history is ordered and mempool unordered in electrum-server
|
|
# For mempool, height is -1 if unconfirmed txins, otherwise 0
|
|
history = await self.manager.async_get_history(hash168)
|
|
mempool = await self.manager.mempool_transactions(hash168)
|
|
|
|
status = ''.join('{}:{:d}:'.format(hash_to_str(tx_hash), height)
|
|
for tx_hash, height in history)
|
|
status += ''.join('{}:{:d}:'.format(hex_hash, -unconfirmed)
|
|
for hex_hash, tx_fee, unconfirmed in mempool)
|
|
if status:
|
|
return sha256(status.encode()).hex()
|
|
return None
|
|
|
|
async def tx_merkle(self, tx_hash, height):
|
|
'''tx_hash is a hex string.'''
|
|
hex_hashes = await self.daemon_request('block_hex_hashes', height, 1)
|
|
block = await self.daemon_request('deserialised_block', hex_hashes[0])
|
|
tx_hashes = block['tx']
|
|
try:
|
|
pos = tx_hashes.index(tx_hash)
|
|
except ValueError:
|
|
raise self.RPCError('tx hash {} not in block {} at height {:,d}'
|
|
.format(tx_hash, hex_hashes[0], height))
|
|
|
|
idx = pos
|
|
hashes = [hex_str_to_hash(txh) for txh in tx_hashes]
|
|
merkle_branch = []
|
|
while len(hashes) > 1:
|
|
if len(hashes) & 1:
|
|
hashes.append(hashes[-1])
|
|
idx = idx - 1 if (idx & 1) else idx + 1
|
|
merkle_branch.append(hash_to_str(hashes[idx]))
|
|
idx //= 2
|
|
hashes = [double_sha256(hashes[n] + hashes[n + 1])
|
|
for n in range(0, len(hashes), 2)]
|
|
|
|
return {"block_height": height, "merkle": merkle_branch, "pos": pos}
|
|
|
|
async def unconfirmed_history(self, hash168):
|
|
# Note unconfirmed history is unordered in electrum-server
|
|
# Height is -1 if unconfirmed txins, otherwise 0
|
|
mempool = await self.manager.mempool_transactions(hash168)
|
|
return [{'tx_hash': tx_hash, 'height': -unconfirmed, 'fee': fee}
|
|
for tx_hash, fee, unconfirmed in mempool]
|
|
|
|
async def get_history(self, hash168):
|
|
# Note history is ordered but unconfirmed is unordered in e-s
|
|
history = await self.manager.async_get_history(hash168)
|
|
conf = [{'tx_hash': hash_to_str(tx_hash), 'height': height}
|
|
for tx_hash, height in history]
|
|
|
|
return conf + await self.unconfirmed_history(hash168)
|
|
|
|
def get_chunk(self, index):
|
|
'''Return header chunk as hex. Index is a non-negative integer.'''
|
|
chunk_size = self.coin.CHUNK_SIZE
|
|
next_height = self.height() + 1
|
|
start_height = min(index * chunk_size, next_height)
|
|
count = min(next_height - start_height, chunk_size)
|
|
return self.bp.read_headers(start_height, count).hex()
|
|
|
|
async def get_utxos(self, hash168):
|
|
'''Get UTXOs asynchronously to reduce latency.'''
|
|
def job():
|
|
return list(self.bp.get_utxos(hash168, limit=None))
|
|
loop = asyncio.get_event_loop()
|
|
return await loop.run_in_executor(None, job)
|
|
|
|
async def get_balance(self, hash168):
|
|
utxos = await self.get_utxos(hash168)
|
|
confirmed = sum(utxo.value for utxo in utxos)
|
|
unconfirmed = self.manager.mempool_value(hash168)
|
|
return {'confirmed': confirmed, 'unconfirmed': unconfirmed}
|
|
|
|
async def list_unspent(self, hash168):
|
|
return [{'tx_hash': hash_to_str(utxo.tx_hash), 'tx_pos': utxo.tx_pos,
|
|
'height': utxo.height, 'value': utxo.value}
|
|
for utxo in sorted(await self.get_utxos(hash168))]
|
|
|
|
# --- blockchain commands
|
|
|
|
async def address_get_balance(self, params):
|
|
hash168 = self.params_to_hash168(params)
|
|
return await self.get_balance(hash168)
|
|
|
|
async def address_get_history(self, params):
|
|
hash168 = self.params_to_hash168(params)
|
|
return await self.get_history(hash168)
|
|
|
|
async def address_get_mempool(self, params):
|
|
hash168 = self.params_to_hash168(params)
|
|
return await self.unconfirmed_history(hash168)
|
|
|
|
async def address_get_proof(self, params):
|
|
hash168 = self.params_to_hash168(params)
|
|
raise self.RPCError('get_proof is not yet implemented')
|
|
|
|
async def address_listunspent(self, params):
|
|
hash168 = self.params_to_hash168(params)
|
|
return await self.list_unspent(hash168)
|
|
|
|
async def address_subscribe(self, params):
|
|
hash168 = self.params_to_hash168(params)
|
|
if len(self.hash168s) >= self.max_subs:
|
|
raise self.RPCError('your address subscription limit {:,d} reached'
|
|
.format(self.max_subs))
|
|
result = await self.address_status(hash168)
|
|
# add_subscription can raise so call it before adding
|
|
self.manager.new_subscription()
|
|
self.hash168s.add(hash168)
|
|
return result
|
|
|
|
async def block_get_chunk(self, params):
|
|
index = self.params_to_non_negative_integer(params)
|
|
return self.get_chunk(index)
|
|
|
|
async def block_get_header(self, params):
|
|
height = self.params_to_non_negative_integer(params)
|
|
return self.manager.electrum_header(height)
|
|
|
|
async def estimatefee(self, params):
|
|
return await self.daemon_request('estimatefee', params)
|
|
|
|
async def headers_subscribe(self, params):
|
|
self.require_empty_params(params)
|
|
self.subscribe_headers = True
|
|
return self.current_electrum_header()
|
|
|
|
async def numblocks_subscribe(self, params):
|
|
self.require_empty_params(params)
|
|
self.subscribe_height = True
|
|
return self.height()
|
|
|
|
async def relayfee(self, params):
|
|
'''The minimum fee a low-priority tx must pay in order to be accepted
|
|
to the daemon's memory pool.'''
|
|
self.require_empty_params(params)
|
|
return await self.daemon_request('relayfee')
|
|
|
|
async def transaction_broadcast(self, params):
|
|
'''Pass through the parameters to the daemon.
|
|
|
|
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:
|
|
tx_hash = await self.daemon.sendrawtransaction(params)
|
|
self.txs_sent += 1
|
|
self.log_info('sent tx: {}'.format(tx_hash))
|
|
self.manager.sent_tx(tx_hash)
|
|
return tx_hash
|
|
except DaemonError as e:
|
|
error = e.args[0]
|
|
message = error['message']
|
|
self.log_info('sendrawtransaction: {}'.format(message),
|
|
throttle=True)
|
|
if 'non-mandatory-script-verify-flag' in message:
|
|
return (
|
|
'Your client produced a transaction that is not accepted '
|
|
'by the network any more. Please upgrade to Electrum '
|
|
'2.5.1 or newer.'
|
|
)
|
|
|
|
return (
|
|
'The transaction was rejected by network rules. ({})\n[{}]'
|
|
.format(message, params[0])
|
|
)
|
|
|
|
async def transaction_get(self, params):
|
|
'''Return the serialized raw transaction.'''
|
|
# For some reason Electrum passes a height. Don't require it
|
|
# in anticipation it might be dropped in the future.
|
|
if 1 <= len(params) <= 2:
|
|
tx_hash = self.param_to_tx_hash(params[0])
|
|
return await self.daemon_request('getrawtransaction', tx_hash)
|
|
|
|
raise self.RPCError('params wrong length: {}'.format(params))
|
|
|
|
async def transaction_get_merkle(self, params):
|
|
if len(params) == 2:
|
|
tx_hash = self.param_to_tx_hash(params[0])
|
|
height = self.param_to_non_negative_integer(params[1])
|
|
return await self.tx_merkle(tx_hash, height)
|
|
|
|
raise self.RPCError('params should contain a transaction hash '
|
|
'and height')
|
|
|
|
async def utxo_get_address(self, params):
|
|
if len(params) == 2:
|
|
tx_hash = self.param_to_tx_hash(params[0])
|
|
index = self.param_to_non_negative_integer(params[1])
|
|
tx_hash = hex_str_to_hash(tx_hash)
|
|
hash168 = self.bp.get_utxo_hash168(tx_hash, index)
|
|
if hash168:
|
|
return self.coin.hash168_to_address(hash168)
|
|
return None
|
|
|
|
raise self.RPCError('params should contain a transaction hash '
|
|
'and index')
|
|
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# --- server commands
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async def banner(self, params):
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'''Return the server banner.'''
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self.require_empty_params(params)
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banner = 'Welcome to Electrum!'
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if self.env.banner_file:
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try:
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with codecs.open(self.env.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.log_error('reading banner file {}: {}'
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.format(self.env.banner_file, e))
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else:
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network_info = await self.daemon.getnetworkinfo()
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version = network_info['version']
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major, minor = divmod(version, 1000000)
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minor, revision = divmod(minor, 10000)
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revision //= 100
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version = '{:d}.{:d}.{:d}'.format(major, minor, revision)
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for pair in [
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('$VERSION', VERSION),
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('$DAEMON_VERSION', 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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async def donation_address(self, params):
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'''Return the donation address as a string.
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If none is specified return the empty string.
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'''
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self.require_empty_params(params)
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return self.env.donation_address
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async def peers_subscribe(self, params):
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'''Returns the peer (ip, host, ports) tuples.
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Despite the name electrum-server does not treat this as a
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subscription.
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'''
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self.require_empty_params(params)
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return list(self.manager.irc_peers().values())
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async def version(self, params):
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'''Return the server version as a string.'''
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if params:
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self.client = str(params[0])[:15]
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if len(params) > 1:
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self.protocol_version = params[1]
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return VERSION
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class LocalRPC(Session):
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'''A local TCP RPC server for querying status.'''
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def __init__(self, *args):
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super().__init__(*args)
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cmds = 'disconnect getinfo groups log peers sessions'.split()
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self.handlers = {cmd: getattr(self.manager, 'rpc_{}'.format(cmd))
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for cmd in cmds}
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self.client = 'RPC'
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self.max_send = 5000000
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