forked from LBRYCommunity/lbry-sdk
488 lines
21 KiB
Python
488 lines
21 KiB
Python
import logging
|
|
import asyncio
|
|
import json
|
|
import socket
|
|
import random
|
|
from time import perf_counter
|
|
from collections import defaultdict
|
|
from typing import Dict, Optional, Tuple
|
|
import aiohttp
|
|
|
|
from lbry import __version__
|
|
from lbry.utils import resolve_host
|
|
from lbry.error import IncompatibleWalletServerError
|
|
from lbry.wallet.rpc import RPCSession as BaseClientSession, Connector, RPCError, ProtocolError
|
|
from lbry.wallet.stream import StreamController
|
|
from lbry.wallet.server.udp import SPVStatusClientProtocol, SPVPong
|
|
from lbry.conf import KnownHubsList
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
class ClientSession(BaseClientSession):
|
|
def __init__(self, *args, network: 'Network', server, timeout=30, concurrency=32, **kwargs):
|
|
self.network = network
|
|
self.server = server
|
|
super().__init__(*args, **kwargs)
|
|
self.framer.max_size = self.max_errors = 1 << 32
|
|
self.timeout = timeout
|
|
self.max_seconds_idle = timeout * 2
|
|
self.response_time: Optional[float] = None
|
|
self.connection_latency: Optional[float] = None
|
|
self._response_samples = 0
|
|
self._concurrency = asyncio.Semaphore(concurrency)
|
|
|
|
@property
|
|
def concurrency(self):
|
|
return self._concurrency._value
|
|
|
|
@property
|
|
def available(self):
|
|
return not self.is_closing() and self.response_time is not None
|
|
|
|
@property
|
|
def server_address_and_port(self) -> Optional[Tuple[str, int]]:
|
|
if not self.transport:
|
|
return None
|
|
return self.transport.get_extra_info('peername')
|
|
|
|
async def send_timed_server_version_request(self, args=(), timeout=None):
|
|
timeout = timeout or self.timeout
|
|
log.debug("send version request to %s:%i", *self.server)
|
|
start = perf_counter()
|
|
result = await asyncio.wait_for(
|
|
super().send_request('server.version', args), timeout=timeout
|
|
)
|
|
current_response_time = perf_counter() - start
|
|
response_sum = (self.response_time or 0) * self._response_samples + current_response_time
|
|
self.response_time = response_sum / (self._response_samples + 1)
|
|
self._response_samples += 1
|
|
return result
|
|
|
|
async def send_request(self, method, args=()):
|
|
log.debug("send %s%s to %s:%i (%i timeout)", method, tuple(args), self.server[0], self.server[1], self.timeout)
|
|
try:
|
|
await self._concurrency.acquire()
|
|
if method == 'server.version':
|
|
return await self.send_timed_server_version_request(args, self.timeout)
|
|
request = asyncio.ensure_future(super().send_request(method, args))
|
|
while not request.done():
|
|
done, pending = await asyncio.wait([request], timeout=self.timeout)
|
|
if pending:
|
|
log.debug("Time since last packet: %s", perf_counter() - self.last_packet_received)
|
|
if (perf_counter() - self.last_packet_received) < self.timeout:
|
|
continue
|
|
log.warning("timeout sending %s to %s:%i", method, *self.server)
|
|
raise asyncio.TimeoutError
|
|
if done:
|
|
try:
|
|
return request.result()
|
|
except ConnectionResetError:
|
|
log.error(
|
|
"wallet server (%s) reset connection upon our %s request, json of %i args is %i bytes",
|
|
self.server[0], method, len(args), len(json.dumps(args))
|
|
)
|
|
raise
|
|
except (RPCError, ProtocolError) as e:
|
|
log.warning("Wallet server (%s:%i) returned an error. Code: %s Message: %s",
|
|
*self.server, *e.args)
|
|
raise e
|
|
except ConnectionError:
|
|
log.warning("connection to %s:%i lost", *self.server)
|
|
self.synchronous_close()
|
|
raise
|
|
except asyncio.CancelledError:
|
|
log.warning("cancelled sending %s to %s:%i", method, *self.server)
|
|
# self.synchronous_close()
|
|
raise
|
|
finally:
|
|
self._concurrency.release()
|
|
|
|
async def ensure_server_version(self, required=None, timeout=3):
|
|
required = required or self.network.PROTOCOL_VERSION
|
|
response = await asyncio.wait_for(
|
|
self.send_request('server.version', [__version__, required]), timeout=timeout
|
|
)
|
|
if tuple(int(piece) for piece in response[0].split(".")) < self.network.MINIMUM_REQUIRED:
|
|
raise IncompatibleWalletServerError(*self.server)
|
|
return response
|
|
|
|
async def keepalive_loop(self, timeout=3, max_idle=60):
|
|
try:
|
|
while True:
|
|
now = perf_counter()
|
|
if min(self.last_send, self.last_packet_received) + max_idle < now:
|
|
await asyncio.wait_for(
|
|
self.send_request('server.ping', []), timeout=timeout
|
|
)
|
|
else:
|
|
await asyncio.sleep(max(0, max_idle - (now - self.last_send)))
|
|
except Exception as err:
|
|
if isinstance(err, asyncio.CancelledError):
|
|
log.warning("closing connection to %s:%i", *self.server)
|
|
else:
|
|
log.exception("lost connection to spv")
|
|
finally:
|
|
if not self.is_closing():
|
|
self._close()
|
|
|
|
async def create_connection(self, timeout=6):
|
|
connector = Connector(lambda: self, *self.server)
|
|
start = perf_counter()
|
|
await asyncio.wait_for(connector.create_connection(), timeout=timeout)
|
|
self.connection_latency = perf_counter() - start
|
|
|
|
async def handle_request(self, request):
|
|
controller = self.network.subscription_controllers[request.method]
|
|
controller.add(request.args)
|
|
|
|
def connection_lost(self, exc):
|
|
log.warning("Connection lost: %s:%d", *self.server)
|
|
super().connection_lost(exc)
|
|
self.response_time = None
|
|
self.connection_latency = None
|
|
self._response_samples = 0
|
|
# self._on_disconnect_controller.add(True)
|
|
if self.network:
|
|
self.network.disconnect()
|
|
|
|
|
|
class Network:
|
|
|
|
PROTOCOL_VERSION = __version__
|
|
MINIMUM_REQUIRED = (0, 65, 0)
|
|
|
|
def __init__(self, ledger):
|
|
self.ledger = ledger
|
|
self.client: Optional[ClientSession] = None
|
|
self.server_features = None
|
|
# self._switch_task: Optional[asyncio.Task] = None
|
|
self.running = False
|
|
self.remote_height: int = 0
|
|
|
|
self._on_connected_controller = StreamController()
|
|
self.on_connected = self._on_connected_controller.stream
|
|
|
|
self._on_header_controller = StreamController(merge_repeated_events=True)
|
|
self.on_header = self._on_header_controller.stream
|
|
|
|
self._on_status_controller = StreamController(merge_repeated_events=True)
|
|
self.on_status = self._on_status_controller.stream
|
|
|
|
self._on_hub_controller = StreamController(merge_repeated_events=True)
|
|
self.on_hub = self._on_hub_controller.stream
|
|
|
|
self.subscription_controllers = {
|
|
'blockchain.headers.subscribe': self._on_header_controller,
|
|
'blockchain.address.subscribe': self._on_status_controller,
|
|
'blockchain.peers.subscribe': self._on_hub_controller,
|
|
}
|
|
|
|
self.aiohttp_session: Optional[aiohttp.ClientSession] = None
|
|
self._urgent_need_reconnect = asyncio.Event()
|
|
self._loop_task: Optional[asyncio.Task] = None
|
|
self._keepalive_task: Optional[asyncio.Task] = None
|
|
|
|
@property
|
|
def config(self):
|
|
return self.ledger.config
|
|
|
|
@property
|
|
def known_hubs(self):
|
|
if 'known_hubs' not in self.config:
|
|
return KnownHubsList()
|
|
return self.config['known_hubs']
|
|
|
|
@property
|
|
def jurisdiction(self):
|
|
return self.config.get("jurisdiction")
|
|
|
|
def disconnect(self):
|
|
if self._keepalive_task and not self._keepalive_task.done():
|
|
self._keepalive_task.cancel()
|
|
self._keepalive_task = None
|
|
|
|
async def start(self):
|
|
if not self.running:
|
|
self.running = True
|
|
self.aiohttp_session = aiohttp.ClientSession()
|
|
self.on_header.listen(self._update_remote_height)
|
|
self.on_hub.listen(self._update_hubs)
|
|
self._loop_task = asyncio.create_task(self.network_loop())
|
|
self._urgent_need_reconnect.set()
|
|
|
|
def loop_task_done_callback(f):
|
|
try:
|
|
f.result()
|
|
except Exception:
|
|
if self.running:
|
|
log.exception("wallet server connection loop crashed")
|
|
|
|
self._loop_task.add_done_callback(loop_task_done_callback)
|
|
|
|
async def resolve_spv_dns(self):
|
|
hostname_to_ip = {}
|
|
ip_to_hostnames = defaultdict(list)
|
|
|
|
async def resolve_spv(server, port):
|
|
try:
|
|
server_addr = await resolve_host(server, port, 'udp')
|
|
hostname_to_ip[server] = (server_addr, port)
|
|
ip_to_hostnames[(server_addr, port)].append(server)
|
|
except socket.error:
|
|
log.warning("error looking up dns for spv server %s:%i", server, port)
|
|
except Exception:
|
|
log.exception("error looking up dns for spv server %s:%i", server, port)
|
|
|
|
# accumulate the dns results
|
|
if self.config['explicit_servers']:
|
|
hubs = self.config['explicit_servers']
|
|
elif self.known_hubs:
|
|
hubs = self.known_hubs
|
|
else:
|
|
hubs = self.config['default_servers']
|
|
await asyncio.gather(*(resolve_spv(server, port) for (server, port) in hubs))
|
|
return hostname_to_ip, ip_to_hostnames
|
|
|
|
async def get_n_fastest_spvs(self, timeout=3.0) -> Dict[Tuple[str, int], Optional[SPVPong]]:
|
|
loop = asyncio.get_event_loop()
|
|
pong_responses = asyncio.Queue()
|
|
connection = SPVStatusClientProtocol(pong_responses)
|
|
sent_ping_timestamps = {}
|
|
_, ip_to_hostnames = await self.resolve_spv_dns()
|
|
n = len(ip_to_hostnames)
|
|
log.info("%i possible spv servers to try (%i urls in config)", n, len(self.config['explicit_servers']))
|
|
pongs = {}
|
|
known_hubs = self.known_hubs
|
|
try:
|
|
await loop.create_datagram_endpoint(lambda: connection, ('0.0.0.0', 0))
|
|
# could raise OSError if it cant bind
|
|
start = perf_counter()
|
|
for server in ip_to_hostnames:
|
|
connection.ping(server)
|
|
sent_ping_timestamps[server] = perf_counter()
|
|
while len(pongs) < n:
|
|
(remote, ts), pong = await asyncio.wait_for(pong_responses.get(), timeout - (perf_counter() - start))
|
|
latency = ts - start
|
|
log.info("%s:%i has latency of %sms (available: %s, height: %i)",
|
|
'/'.join(ip_to_hostnames[remote]), remote[1], round(latency * 1000, 2),
|
|
pong.available, pong.height)
|
|
|
|
known_hubs.hubs.setdefault((ip_to_hostnames[remote][0], remote[1]), {}).update(
|
|
{"country": pong.country_name}
|
|
)
|
|
if pong.available:
|
|
pongs[(ip_to_hostnames[remote][0], remote[1])] = pong
|
|
return pongs
|
|
except asyncio.TimeoutError:
|
|
if pongs:
|
|
log.info("%i/%i probed spv servers are accepting connections", len(pongs), len(ip_to_hostnames))
|
|
return pongs
|
|
else:
|
|
log.warning("%i spv status probes failed, retrying later. servers tried: %s",
|
|
len(sent_ping_timestamps),
|
|
', '.join('/'.join(hosts) + f' ({ip})' for ip, hosts in ip_to_hostnames.items()))
|
|
random_server = random.choice(list(ip_to_hostnames.keys()))
|
|
host, port = random_server
|
|
log.warning("trying fallback to randomly selected spv: %s:%i", host, port)
|
|
known_hubs.hubs.setdefault((host, port), {})
|
|
return {(host, port): None}
|
|
finally:
|
|
connection.close()
|
|
|
|
async def connect_to_fastest(self) -> Optional[ClientSession]:
|
|
fastest_spvs = await self.get_n_fastest_spvs()
|
|
for (host, port), pong in fastest_spvs.items():
|
|
if (pong is not None and self.jurisdiction is not None) and \
|
|
(pong.country_name != self.jurisdiction):
|
|
continue
|
|
client = ClientSession(network=self, server=(host, port), timeout=self.config['hub_timeout'],
|
|
concurrency=self.config['concurrent_hub_requests'])
|
|
try:
|
|
await client.create_connection()
|
|
log.warning("Connected to spv server %s:%i", host, port)
|
|
await client.ensure_server_version()
|
|
return client
|
|
except (asyncio.TimeoutError, ConnectionError, OSError, IncompatibleWalletServerError, RPCError):
|
|
log.warning("Connecting to %s:%d failed", host, port)
|
|
client._close()
|
|
return
|
|
|
|
async def network_loop(self):
|
|
sleep_delay = 30
|
|
while self.running:
|
|
await asyncio.wait(
|
|
[asyncio.sleep(30), self._urgent_need_reconnect.wait()], return_when=asyncio.FIRST_COMPLETED
|
|
)
|
|
if self._urgent_need_reconnect.is_set():
|
|
sleep_delay = 30
|
|
self._urgent_need_reconnect.clear()
|
|
if not self.is_connected:
|
|
client = await self.connect_to_fastest()
|
|
if not client:
|
|
log.warning("failed to connect to any spv servers, retrying later")
|
|
sleep_delay *= 2
|
|
sleep_delay = min(sleep_delay, 300)
|
|
continue
|
|
log.debug("get spv server features %s:%i", *client.server)
|
|
features = await client.send_request('server.features', [])
|
|
self.client, self.server_features = client, features
|
|
log.debug("discover other hubs %s:%i", *client.server)
|
|
await self._update_hubs(await client.send_request('server.peers.subscribe', []))
|
|
log.info("subscribe to headers %s:%i", *client.server)
|
|
self._update_remote_height((await self.subscribe_headers(),))
|
|
self._on_connected_controller.add(True)
|
|
server_str = "%s:%i" % client.server
|
|
log.info("maintaining connection to spv server %s", server_str)
|
|
self._keepalive_task = asyncio.create_task(self.client.keepalive_loop())
|
|
try:
|
|
if not self._urgent_need_reconnect.is_set():
|
|
await asyncio.wait(
|
|
[self._keepalive_task, self._urgent_need_reconnect.wait()],
|
|
return_when=asyncio.FIRST_COMPLETED
|
|
)
|
|
else:
|
|
await self._keepalive_task
|
|
if self._urgent_need_reconnect.is_set():
|
|
log.warning("urgent reconnect needed")
|
|
self._urgent_need_reconnect.clear()
|
|
if self._keepalive_task and not self._keepalive_task.done():
|
|
self._keepalive_task.cancel()
|
|
except asyncio.CancelledError:
|
|
pass
|
|
finally:
|
|
self._keepalive_task = None
|
|
self.client = None
|
|
self.server_features = None
|
|
log.warning("connection lost to %s", server_str)
|
|
log.info("network loop finished")
|
|
|
|
async def stop(self):
|
|
self.running = False
|
|
self.disconnect()
|
|
if self._loop_task and not self._loop_task.done():
|
|
self._loop_task.cancel()
|
|
self._loop_task = None
|
|
if self.aiohttp_session:
|
|
await self.aiohttp_session.close()
|
|
self.aiohttp_session = None
|
|
|
|
@property
|
|
def is_connected(self):
|
|
return self.client and not self.client.is_closing()
|
|
|
|
def rpc(self, list_or_method, args, restricted=True, session: Optional[ClientSession] = None):
|
|
if session or self.is_connected:
|
|
session = session or self.client
|
|
return session.send_request(list_or_method, args)
|
|
else:
|
|
self._urgent_need_reconnect.set()
|
|
raise ConnectionError("Attempting to send rpc request when connection is not available.")
|
|
|
|
async def retriable_call(self, function, *args, **kwargs):
|
|
while self.running:
|
|
if not self.is_connected:
|
|
log.warning("Wallet server unavailable, waiting for it to come back and retry.")
|
|
self._urgent_need_reconnect.set()
|
|
await self.on_connected.first
|
|
try:
|
|
return await function(*args, **kwargs)
|
|
except asyncio.TimeoutError:
|
|
log.warning("Wallet server call timed out, retrying.")
|
|
except ConnectionError:
|
|
log.warning("connection error")
|
|
|
|
raise asyncio.CancelledError() # if we got here, we are shutting down
|
|
|
|
def _update_remote_height(self, header_args):
|
|
self.remote_height = header_args[0]["height"]
|
|
|
|
async def _update_hubs(self, hubs):
|
|
if hubs and hubs != ['']:
|
|
try:
|
|
if self.known_hubs.add_hubs(hubs):
|
|
self.known_hubs.save()
|
|
except Exception:
|
|
log.exception("could not add hubs: %s", hubs)
|
|
|
|
def get_transaction(self, tx_hash, known_height=None):
|
|
# use any server if its old, otherwise restrict to who gave us the history
|
|
restricted = known_height in (None, -1, 0) or 0 > known_height > self.remote_height - 10
|
|
return self.rpc('blockchain.transaction.get', [tx_hash], restricted)
|
|
|
|
def get_transaction_batch(self, txids, restricted=True):
|
|
# use any server if its old, otherwise restrict to who gave us the history
|
|
return self.rpc('blockchain.transaction.get_batch', txids, restricted)
|
|
|
|
def get_transaction_and_merkle(self, tx_hash, known_height=None):
|
|
# use any server if its old, otherwise restrict to who gave us the history
|
|
restricted = known_height in (None, -1, 0) or 0 > known_height > self.remote_height - 10
|
|
return self.rpc('blockchain.transaction.info', [tx_hash], restricted)
|
|
|
|
def get_transaction_height(self, tx_hash, known_height=None):
|
|
restricted = not known_height or 0 > known_height > self.remote_height - 10
|
|
return self.rpc('blockchain.transaction.get_height', [tx_hash], restricted)
|
|
|
|
def get_merkle(self, tx_hash, height):
|
|
restricted = 0 > height > self.remote_height - 10
|
|
return self.rpc('blockchain.transaction.get_merkle', [tx_hash, height], restricted)
|
|
|
|
def get_headers(self, height, count=10000, b64=False):
|
|
restricted = height >= self.remote_height - 100
|
|
return self.rpc('blockchain.block.headers', [height, count, 0, b64], restricted)
|
|
|
|
# --- Subscribes, history and broadcasts are always aimed towards the master client directly
|
|
def get_history(self, address):
|
|
return self.rpc('blockchain.address.get_history', [address], True)
|
|
|
|
def broadcast(self, raw_transaction):
|
|
return self.rpc('blockchain.transaction.broadcast', [raw_transaction], True)
|
|
|
|
def subscribe_headers(self):
|
|
return self.rpc('blockchain.headers.subscribe', [True], True)
|
|
|
|
async def subscribe_address(self, address, *addresses):
|
|
addresses = list((address, ) + addresses)
|
|
server_addr_and_port = self.client.server_address_and_port # on disconnect client will be None
|
|
try:
|
|
return await self.rpc('blockchain.address.subscribe', addresses, True)
|
|
except asyncio.TimeoutError:
|
|
log.warning(
|
|
"timed out subscribing to addresses from %s:%i",
|
|
*server_addr_and_port
|
|
)
|
|
# abort and cancel, we can't lose a subscription, it will happen again on reconnect
|
|
if self.client:
|
|
self.client.abort()
|
|
raise asyncio.CancelledError()
|
|
|
|
def unsubscribe_address(self, address):
|
|
return self.rpc('blockchain.address.unsubscribe', [address], True)
|
|
|
|
def get_server_features(self):
|
|
return self.rpc('server.features', (), restricted=True)
|
|
|
|
def resolve(self, urls, session_override=None):
|
|
return self.rpc('blockchain.claimtrie.resolve', urls, False, session_override)
|
|
|
|
def claim_search(self, session_override=None, **kwargs):
|
|
return self.rpc('blockchain.claimtrie.search', kwargs, False, session_override)
|
|
|
|
async def new_resolve(self, server, urls):
|
|
message = {"method": "resolve", "params": {"urls": urls, "protobuf": True}}
|
|
async with self.aiohttp_session.post(server, json=message) as r:
|
|
result = await r.json()
|
|
return result['result']
|
|
|
|
async def new_claim_search(self, server, **kwargs):
|
|
kwargs['protobuf'] = True
|
|
message = {"method": "claim_search", "params": kwargs}
|
|
async with self.aiohttp_session.post(server, json=message) as r:
|
|
result = await r.json()
|
|
return result['result']
|
|
|
|
async def sum_supports(self, server, **kwargs):
|
|
message = {"method": "support_sum", "params": kwargs}
|
|
async with self.aiohttp_session.post(server, json=message) as r:
|
|
result = await r.json()
|
|
return result['result']
|