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Merge pull request #2414 from lbryio/fix-connection-errors-reloaded

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Switch to the fastest wallet server and fix connection errors
This commit is contained in:
Jack Robison 2019-08-26 11:13:20 -04:00 committed by GitHub
commit 71fbb3df24
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 106 additions and 52 deletions
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2
lbry/lbry/blob_exchange/client.py
View file

@ -151,7 +151,7 @@ class BlobExchangeClientProtocol(asyncio.Protocol):
return self._blob_bytes_received, self.close()
msg = f"downloading {self.blob.blob_hash[:8]} from {self.peer_address}:{self.peer_port}," \
f" timeout in {self.peer_timeout}"
log.info(msg)
log.debug(msg)
msg = f"downloaded {self.blob.blob_hash[:8]} from {self.peer_address}:{self.peer_port}"
await asyncio.wait_for(self.writer.finished, self.peer_timeout, loop=self.loop)
log.info("%s at %fMB/s", msg,

3
lbry/lbry/dht/blob_announcer.py
View file

@ -22,13 +22,12 @@ class BlobAnnouncer:
if peers > 4:
return blob_hash
else:
log.warning("failed to announce %s, could only find %d peers, retrying soon.", blob_hash[:8], peers)
log.debug("failed to announce %s, could only find %d peers, retrying soon.", blob_hash[:8], peers)
except Exception as err:
if isinstance(err, asyncio.CancelledError):
raise err
log.warning("error announcing %s: %s", blob_hash[:8], str(err))
async def _announce(self, batch_size: typing.Optional[int] = 10):
while batch_size:
if not self.node.joined.is_set():

4
lbry/lbry/dht/node.py
View file

@ -88,10 +88,10 @@ class Node:
)
stored_to = [node_id for node_id, contacted in stored_to_tup if contacted]
if stored_to:
log.info("Stored %s to %i of %i attempted peers", binascii.hexlify(hash_value).decode()[:8],
log.debug("Stored %s to %i of %i attempted peers", binascii.hexlify(hash_value).decode()[:8],
len(stored_to), len(peers))
else:
log.warning("Failed announcing %s, stored to 0 peers", blob_hash[:8])
log.debug("Failed announcing %s, stored to 0 peers", blob_hash[:8])
return stored_to
def stop(self) -> None:

21
torba/torba/client/baseledger.py
View file

@ -395,9 +395,13 @@ class BaseLedger(metaclass=LedgerRegistry):
async def subscribe_addresses(self, address_manager: baseaccount.AddressManager, addresses: List[str]):
if self.network.is_connected and addresses:
async for address, remote_status in self.network.subscribe_address(*addresses):
# subscribe isnt a retriable call as it happens right after a connection is made
self._update_tasks.add(self.update_history(address, remote_status, address_manager))
await asyncio.wait([
self.subscribe_address(address_manager, address) for address in addresses
])
async def subscribe_address(self, address_manager: baseaccount.AddressManager, address: str):
remote_status = await self.network.subscribe_address(address)
self._update_tasks.add(self.update_history(address, remote_status, address_manager))
def process_status_update(self, update):
address, remote_status = update
@ -466,6 +470,17 @@ class BaseLedger(metaclass=LedgerRegistry):
if address_manager is not None:
await address_manager.ensure_address_gap()
local_status, local_history = await self.get_local_status_and_history(address)
if local_status != remote_status:
log.debug(
"Wallet is out of sync after syncing. Remote: %s with %d items, local: %s with %d items",
remote_status, len(remote_history), local_status, len(local_history)
)
log.debug("local: %s", local_history)
log.debug("remote: %s", remote_history)
else:
log.debug("Sync completed for: %s", address)
async def cache_transaction(self, txid, remote_height):
cache_item = self._tx_cache.get(txid)
if cache_item is None:

124
torba/torba/client/basenetwork.py
View file

@ -29,6 +29,8 @@ class ClientSession(BaseClientSession):
self.pending_amount = 0
self._on_connect_cb = on_connect_callback or (lambda: None)
self.trigger_urgent_reconnect = asyncio.Event()
# one request per second of timeout, conservative default
self._semaphore = asyncio.Semaphore(self.timeout)
@property
def available(self):
@ -40,11 +42,12 @@ class ClientSession(BaseClientSession):
return None
return self.transport.get_extra_info('peername')
async def send_timed_server_version_request(self, args=()):
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=self.timeout
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
@ -54,23 +57,42 @@ class ClientSession(BaseClientSession):
async def send_request(self, method, args=()):
self.pending_amount += 1
async with self._semaphore:
return await self._send_request(method, args)
async def _send_request(self, method, args=()):
log.debug("send %s to %s:%i", method, *self.server)
try:
if method == 'server.version':
return await self.send_timed_server_version_request(args)
return await asyncio.wait_for(
super().send_request(method, args), timeout=self.timeout
)
reply = await self.send_timed_server_version_request(args, self.timeout)
else:
reply = await asyncio.wait_for(
super().send_request(method, args), timeout=self.timeout
)
log.debug("got reply for %s from %s:%i", method, *self.server)
return reply
except RPCError 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.TimeoutError:
log.info("timeout sending %s to %s:%i", method, *self.server)
raise
except asyncio.CancelledError:
log.info("cancelled sending %s to %s:%i", method, *self.server)
self.synchronous_close()
raise
finally:
self.pending_amount -= 1
async def ensure_session(self):
# Handles reconnecting and maintaining a session alive
# TODO: change to 'ping' on newer protocol (above 1.2)
retry_delay = default_delay = 0.1
retry_delay = default_delay = 1.0
while True:
try:
if self.is_closing():
@ -83,19 +105,18 @@ class ClientSession(BaseClientSession):
except (asyncio.TimeoutError, OSError):
await self.close()
retry_delay = min(60, retry_delay * 2)
log.warning("Wallet server timeout (retry in %s seconds): %s:%d", retry_delay, *self.server)
log.debug("Wallet server timeout (retry in %s seconds): %s:%d", retry_delay, *self.server)
try:
await asyncio.wait_for(self.trigger_urgent_reconnect.wait(), timeout=retry_delay)
except asyncio.TimeoutError:
pass
except asyncio.CancelledError:
self.synchronous_close()
raise
finally:
self.trigger_urgent_reconnect.clear()
def ensure_server_version(self, required='1.2'):
return self.send_request('server.version', [__version__, required])
async def ensure_server_version(self, required='1.2', timeout=3):
return await asyncio.wait_for(
self.send_request('server.version', [__version__, required]), timeout=timeout
)
async def create_connection(self, timeout=6):
connector = Connector(lambda: self, *self.server)
@ -120,7 +141,6 @@ class ClientSession(BaseClientSession):
class BaseNetwork:
def __init__(self, ledger):
self.switch_event = asyncio.Event()
self.config = ledger.config
self.session_pool = SessionPool(network=self, timeout=self.config.get('connect_timeout', 6))
self.client: Optional[ClientSession] = None
@ -141,24 +161,38 @@ class BaseNetwork:
'blockchain.address.subscribe': self._on_status_controller,
}
async def switch_to_fastest(self):
try:
client = await asyncio.wait_for(self.session_pool.wait_for_fastest_session(), 30)
except asyncio.TimeoutError:
if self.client:
await self.client.close()
self.client = None
for session in self.session_pool.sessions:
session.synchronous_close()
log.warning("not connected to any wallet servers")
return
current_client = self.client
self.client = client
log.info("Switching to SPV wallet server: %s:%d", *self.client.server)
self._on_connected_controller.add(True)
try:
self._update_remote_height((await self.subscribe_headers(),))
log.info("Subscribed to headers: %s:%d", *self.client.server)
except asyncio.TimeoutError:
if self.client:
await self.client.close()
self.client = current_client
return
self.session_pool.new_connection_event.clear()
return await self.session_pool.new_connection_event.wait()
async def start(self):
self.running = True
self.session_pool.start(self.config['default_servers'])
self.on_header.listen(self._update_remote_height)
while self.running:
try:
self.client = await self.session_pool.wait_for_fastest_session()
self._update_remote_height((await self.subscribe_headers(),))
log.info("Switching to SPV wallet server: %s:%d", *self.client.server)
self._on_connected_controller.add(True)
self.client.on_disconnected.listen(lambda _: self.switch_event.set())
await self.switch_event.wait()
self.switch_event.clear()
except asyncio.CancelledError:
await self.stop()
raise
except asyncio.TimeoutError:
pass
await self.switch_to_fastest()
async def stop(self):
self.running = False
@ -169,8 +203,10 @@ class BaseNetwork:
return self.client and not self.client.is_closing()
def rpc(self, list_or_method, args, session=None):
session = session or self.session_pool.fastest_session
if session:
# fixme: use fastest unloaded session, but for now it causes issues with wallet sync
# session = session or self.session_pool.fastest_session
session = self.client
if session and not session.is_closing():
return session.send_request(list_or_method, args)
else:
self.session_pool.trigger_nodelay_connect()
@ -178,21 +214,21 @@ class BaseNetwork:
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.")
await self.on_connected.first
await self.session_pool.wait_for_fastest_session()
try:
return await function(*args, **kwargs)
except asyncio.TimeoutError:
log.warning("Wallet server call timed out, retrying.")
except ConnectionError:
if not self.is_connected and self.running:
log.warning("Wallet server unavailable, waiting for it to come back and retry.")
await self.on_connected.first
pass
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"]
def get_history(self, address):
return self.rpc('blockchain.address.get_history', [address])
def get_transaction(self, tx_hash):
return self.rpc('blockchain.transaction.get', [tx_hash])
@ -205,19 +241,23 @@ class BaseNetwork:
def get_headers(self, height, count=10000):
return self.rpc('blockchain.block.headers', [height, count])
# --- Subscribes and broadcasts are always aimed towards the master client directly
# --- 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], session=self.client)
def broadcast(self, raw_transaction):
return self.rpc('blockchain.transaction.broadcast', [raw_transaction], session=self.client)
def subscribe_headers(self):
return self.rpc('blockchain.headers.subscribe', [True], session=self.client)
async def subscribe_address(self, *addresses):
async with self.client.send_batch() as batch:
for address in addresses:
batch.add_request('blockchain.address.subscribe', [address])
for address, status in zip(addresses, batch.results):
yield address, status
async def subscribe_address(self, address):
try:
return await self.rpc('blockchain.address.subscribe', [address], session=self.client)
except asyncio.TimeoutError:
# abort and cancel, we cant lose a subscription, it will happen again on reconnect
self.client.abort()
raise asyncio.CancelledError()
class SessionPool:

4
torba/torba/stream.py
View file

@ -145,8 +145,8 @@ class Stream:
def first(self):
future = asyncio.get_event_loop().create_future()
subscription = self.listen(
lambda value: self._cancel_and_callback(subscription, future, value),
lambda exception: self._cancel_and_error(subscription, future, exception)
lambda value: not future.done() and self._cancel_and_callback(subscription, future, value),
lambda exception: not future.done() and self._cancel_and_error(subscription, future, exception)
)
return future