forked from LBRYCommunity/lbry-sdk
143 lines
5.1 KiB
Python
143 lines
5.1 KiB
Python
import logging
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import asyncio
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from asyncio import CancelledError
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from itertools import cycle
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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):
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connector = Connector(lambda: self, *self.server)
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await connector.create_connection()
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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.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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delay = 0.0
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for server in cycle(self.config['default_servers']):
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self.client = ClientSession(network=self, server=server)
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connection_string = '{}:{}'.format(*server)
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try:
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await self.client.create_connection()
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await self.ensure_server_version()
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log.info("Successfully connected to SPV wallet server: %s", connection_string)
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self._on_connected_controller.add(True)
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delay = 0.0
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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 Exception: # pylint: disable=broad-except
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log.exception("Connecting to %s raised an exception:", connection_string)
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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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await asyncio.sleep(delay)
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delay = min(delay + 1.0, 10.0)
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async def stop(self):
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self.running = False
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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_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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