228 lines
8.3 KiB
Python
228 lines
8.3 KiB
Python
import logging
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import asyncio
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from asyncio import CancelledError
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from time import time
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from torba.rpc import RPCSession as BaseClientSession, Connector, RPCError
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from torba import __version__
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from torba.stream import StreamController
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log = logging.getLogger(__name__)
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class ClientSession(BaseClientSession):
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def __init__(self, *args, network, server, **kwargs):
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self.network = network
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self.server = server
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super().__init__(*args, **kwargs)
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self._on_disconnect_controller = StreamController()
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self.on_disconnected = self._on_disconnect_controller.stream
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self.bw_limit = self.framer.max_size = self.max_errors = 1 << 32
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self.max_seconds_idle = 60
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self.ping_task = None
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async def send_request(self, method, args=()):
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try:
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return await super().send_request(method, args)
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except RPCError as e:
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log.warning("Wallet server returned an error. Code: %s Message: %s", *e.args)
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raise e
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async def ping_forever(self):
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# TODO: change to 'ping' on newer protocol (above 1.2)
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while not self.is_closing():
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if (time() - self.last_send) > self.max_seconds_idle:
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await self.send_request('server.banner')
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await asyncio.sleep(self.max_seconds_idle//3)
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async def create_connection(self, timeout=6):
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connector = Connector(lambda: self, *self.server)
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await asyncio.wait_for(connector.create_connection(), timeout=timeout)
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self.ping_task = asyncio.create_task(self.ping_forever())
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async def handle_request(self, request):
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controller = self.network.subscription_controllers[request.method]
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controller.add(request.args)
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def connection_lost(self, exc):
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super().connection_lost(exc)
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self._on_disconnect_controller.add(True)
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if self.ping_task:
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self.ping_task.cancel()
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class BaseNetwork:
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def __init__(self, ledger):
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self.config = ledger.config
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self.client: ClientSession = None
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self.session_pool: SessionPool = None
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self.running = False
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self._on_connected_controller = StreamController()
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self.on_connected = self._on_connected_controller.stream
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self._on_header_controller = StreamController()
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self.on_header = self._on_header_controller.stream
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self._on_status_controller = StreamController()
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self.on_status = self._on_status_controller.stream
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self.subscription_controllers = {
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'blockchain.headers.subscribe': self._on_header_controller,
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'blockchain.address.subscribe': self._on_status_controller,
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}
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async def start(self):
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self.running = True
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connect_timeout = self.config.get('connect_timeout', 6)
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self.session_pool = SessionPool(network=self, timeout=connect_timeout)
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self.session_pool.start(self.config['default_servers'])
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while True:
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try:
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self.client = await self.session_pool.pick_fastest_server()
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if self.is_connected:
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await self.ensure_server_version()
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log.info("Successfully connected to SPV wallet server: %s:%d", *self.client.server)
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self._on_connected_controller.add(True)
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await self.client.on_disconnected.first
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except CancelledError:
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self.running = False
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except asyncio.TimeoutError:
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log.warning("Timed out while trying to find a server!")
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except Exception: # pylint: disable=broad-except
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log.exception("Exception while trying to find a server!")
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if not self.running:
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return
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elif self.client:
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await self.client.close()
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self.client.connection.cancel_pending_requests()
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async def stop(self):
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self.running = False
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if self.session_pool:
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self.session_pool.stop()
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if self.is_connected:
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disconnected = self.client.on_disconnected.first
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await self.client.close()
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await disconnected
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@property
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def is_connected(self):
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return self.client is not None and not self.client.is_closing()
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def rpc(self, list_or_method, args):
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if self.is_connected:
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return self.client.send_request(list_or_method, args)
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else:
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raise ConnectionError("Attempting to send rpc request when connection is not available.")
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def ensure_server_version(self, required='1.2'):
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return self.rpc('server.version', [__version__, required])
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def broadcast(self, raw_transaction):
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return self.rpc('blockchain.transaction.broadcast', [raw_transaction])
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def get_history(self, address):
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return self.rpc('blockchain.address.get_history', [address])
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def get_transaction(self, tx_hash):
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return self.rpc('blockchain.transaction.get', [tx_hash])
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def get_transaction_height(self, tx_hash):
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return self.rpc('blockchain.transaction.get_height', [tx_hash])
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def get_merkle(self, tx_hash, height):
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return self.rpc('blockchain.transaction.get_merkle', [tx_hash, height])
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def get_headers(self, height, count=10000):
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return self.rpc('blockchain.block.headers', [height, count])
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def subscribe_headers(self):
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return self.rpc('blockchain.headers.subscribe', [True])
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def subscribe_address(self, address):
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return self.rpc('blockchain.address.subscribe', [address])
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class SessionPool:
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def __init__(self, network: BaseNetwork, timeout: float):
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self.network = network
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self.sessions = []
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self._dead_servers = []
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self.maintain_connections_task = None
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self.timeout = timeout
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# triggered when the master server is out, to speed up reconnect
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self._lost_master = asyncio.Event()
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@property
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def online(self):
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for session in self.sessions:
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if not session.is_closing():
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return True
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return False
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def start(self, default_servers):
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self.sessions = [
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ClientSession(network=self.network, server=server)
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for server in default_servers
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]
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self.maintain_connections_task = asyncio.create_task(self.ensure_connections())
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def stop(self):
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if self.maintain_connections_task:
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self.maintain_connections_task.cancel()
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for session in self.sessions:
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if not session.is_closing():
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session.abort()
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self.sessions, self._dead_servers, self.maintain_connections_task = [], [], None
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async def ensure_connections(self):
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while True:
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await asyncio.gather(*[
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self.ensure_connection(session)
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for session in self.sessions
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], return_exceptions=True)
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await asyncio.wait([asyncio.sleep(3), self._lost_master.wait()], return_when='FIRST_COMPLETED')
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self._lost_master.clear()
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if not self.sessions:
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self.sessions.extend(self._dead_servers)
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self._dead_servers = []
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async def ensure_connection(self, session):
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if not session.is_closing():
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return
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try:
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return await session.create_connection(self.timeout)
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except asyncio.TimeoutError:
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log.warning("Timeout connecting to %s:%d", *session.server)
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except asyncio.CancelledError: # pylint: disable=try-except-raise
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raise
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except Exception as err: # pylint: disable=broad-except
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if 'Connect call failed' in str(err):
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log.warning("Could not connect to %s:%d", *session.server)
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else:
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log.exception("Connecting to %s:%d raised an exception:", *session.server)
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self._dead_servers.append(session)
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self.sessions.remove(session)
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async def pick_fastest_server(self):
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self._lost_master.set()
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while not self.online:
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await asyncio.sleep(0.1)
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async def _probe(session):
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await session.send_request('server.banner')
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return session
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done, pending = await asyncio.wait([
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_probe(session)
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for session in self.sessions if not session.is_closing()
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], return_when='FIRST_COMPLETED')
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for task in pending:
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task.cancel()
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for session in done:
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return await session
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