class Subscriber(object):
def __init__(self, validator_url):
LOGGER.info('Connecting to validator: %s', validator_url)
self._stream = Stream(validator_url)
self._event_handlers = []
def add_handler(self, handler):
self._event_handlers.append(handler)
def listen_to_event(self):
self._stream.wait_for_ready()
# Step 1: Construct a Subscription
block_sub = EventSubscription(event_type='sawtooth/block-commit')
# Step 2: Submit the Event Subscription
request = ClientEventsSubscribeRequest(subscriptions=[block_sub])
response_future = self._stream.send(
Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
request.SerializeToString())
response = ClientEventsSubscribeResponse()
response.ParseFromString(response_future.result().content)
# Listen for events in an infinite loop
LOGGER.warning("Listening to events.")
while True:
msg = self._stream.receive()
event_list = EventList()
event_list.ParseFromString(msg.result().content)
for handler in self._event_handlers:
handler(event_list.events)
def listen_to_events(delta_filters=None):
'''Listen to cookiejar state-delta events.'''
# Subscribe to events
block_commit_subscription = events_pb2.EventSubscription(
event_type="sawtooth/block-commit")
state_delta_subscription = events_pb2.EventSubscription(
event_type="sawtooth/state-delta", filters=delta_filters)
fine_subscription = events_pb2.EventSubscription(
event_type="AC is in good condition")
problem_subscription = events_pb2.EventSubscription(
event_type="AC is malfunctioning")
fixed_subscription = events_pb2.EventSubscription(
event_type="Maintenance fixed the AC")
notfixed_subscription = events_pb2.EventSubscription(
event_type="Maintenance hasn't fixed the AC yet")
request = client_event_pb2.ClientEventsSubscribeRequest(
subscriptions=[fine_subscription,problem_subscription,fixed_subscription,notfixed_subscription])
# Send the subscription request
stream = Stream(DEFAULT_VALIDATOR_URL)
msg = stream.send(message_type=Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
content=request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_SUBSCRIBE_RESPONSE
# Parse the subscription response
response = client_event_pb2.ClientEventsSubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsSubscribeResponse.OK
# Listen for events in an infinite loop
print("Listening to events.")
msg = stream.receive().result()
assert msg.message_type == Message.CLIENT_EVENTS
# Parse the response
event_list = events_pb2.EventList()
event_list.ParseFromString(msg.content)
print("Received the following events: ----------")
notification=[]
for event in event_list.events:
notification.append((event.event_type,event.attributes))
#server_socket(notification)
# Unsubscribe from events
request = client_event_pb2.ClientEventsUnsubscribeRequest()
msg = stream.send(Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_UNSUBSCRIBE_RESPONSE
# Parse the unsubscribe response
response = client_event_pb2.ClientEventsUnsubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsUnsubscribeResponse.OK
return notification
class eventHandler:
def __init__(self, validatorUrl):
self.stream = Stream(validatorUrl)
def generateFilters(self):
pass
def generateSubscritionRequest(self, eventTypes, deltaFilters):
susbscriptions = []
if (len(eventTypes) == len(deltaFilters)):
print("same length")
for i in range(0, len(events)):
subscription = events_pb2.EventSubscription(
event_type=event[i], filters=deltaFilters[i])
susbscriptions.append(subscription)
print(susbscriptions)
subscritionRequest = client_event_pb2.ClientEventsSubscribeRequest(
subscriptions=susbscriptions)
return subscritionRequest
else:
print("Error : EventType and delta filter length mismatch ! ",
flush=True)
def listenToEvents(self, eventTypes, subsciptionRequest):
print("here", eventTypes)
message = self.stream.send(
message_type=Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
content=subsciptionRequest.SerializeToString()).result()
assert message.message_tyype == Message.CLIENT_EVENTS_SUBSCRIBE_RESPONSE, "Undefined Message Responce Type"
response = client_event_pb2.ClientEventsSubscribeResponse()
response.ParseFromString(message.content)
assert response.status == client_event_pb2.ClientEventsSubscribeResponse.OK, "Status : Message Responce Not Okay "
while True:
streamMsg = self.stream.receive().result()
assert streamMsg.message_type == Message.CLIENT_EVENTS, "Stream Message Type Undefined"
# Parse the response
eventList = events_pb2.EventList()
eventList.ParseFromString(streamMsg.content)
for event in eventList:
if (event.event_type in eventTypes):
print("Event Of Type " + eventType + " Received",
flush=True)
print("Event : " + event, flush=True)
def unsubscribeEvent(self):
request = client_event_pb2.ClientEventsUnsubscribeRequest()
msg = stream.send(Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_UNSUBSCRIBE_RESPONSE
response = client_event_pb2.ClientEventsUnsubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == client_event_pb2.ClientEventsUnsubscribeResponse.OK
print("Evens Unsubscribed ! ", flush=True)
def listen_to_events(delta_filters=None):
'''Listen to cookiejar state-delta events.'''
# Subscribe to events
block_commit_subscription = events_pb2.EventSubscription(
event_type="sawtooth/block-commit")
state_delta_subscription = events_pb2.EventSubscription(
event_type="sawtooth/state-delta", filters=delta_filters)
bake_subscription = events_pb2.EventSubscription(
event_type="cookiejar/bake")
eat_subscription = events_pb2.EventSubscription(event_type="cookiejar/eat")
request = client_event_pb2.ClientEventsSubscribeRequest(subscriptions=[
block_commit_subscription, state_delta_subscription, bake_subscription,
eat_subscription
])
# Send the subscription request
stream = Stream(DEFAULT_VALIDATOR_URL)
msg = stream.send(message_type=Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
content=request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_SUBSCRIBE_RESPONSE
# Parse the subscription response
response = client_event_pb2.ClientEventsSubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsSubscribeResponse.OK
# Listen for events in an infinite loop
print("Listening to events.")
while True:
msg = stream.receive().result()
assert msg.message_type == Message.CLIENT_EVENTS
# Parse the response
event_list = events_pb2.EventList()
event_list.ParseFromString(msg.content)
print("Received the following events: ----------")
for event in event_list.events:
print(event)
# Unsubscribe from events
request = client_event_pb2.ClientEventsUnsubscribeRequest()
msg = stream.send(Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_UNSUBSCRIBE_RESPONSE
# Parse the unsubscribe response
response = client_event_pb2.ClientEventsUnsubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsUnsubscribeResponse.OK
def listen_to_events():
# Listen for events in an infinite loop
stream = Stream(DEFAULT_VALIDATOR_URL)
print("Listening to events.")
while True:
msg = stream.receive().result()
assert msg.message_type == Message.CLIENT_EVENTS
# Parse the response
event_list = events_pb2.EventList()
event_list.ParseFromString(msg.content)
print("Received the following events: ----------")
for event in event_list.events:
print(event)
class ZmqDriver(Driver):
def __init__(self, engine):
super().__init__(engine)
self._engine = engine
self._stream = None
self._exit = False
self._updates = None
def start(self, endpoint):
self._stream = Stream(endpoint)
startup_state = self._register()
self._updates = Queue()
driver_thread = Thread(
target=self._driver_loop)
driver_thread.start()
try:
self._engine.start(
self._updates,
ZmqService(
stream=self._stream,
timeout=SERVICE_TIMEOUT,
name=self._engine.name(),
version=self._engine.version()),
startup_state)
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught engine exception")
self.stop()
driver_thread.join()
def _driver_loop(self):
try:
future = self._stream.receive()
while True:
if self._exit:
self._engine.stop()
break
try:
message = future.result(1)
future = self._stream.receive()
except concurrent.futures.TimeoutError:
continue
result = self._process(message)
self._updates.put(result)
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught driver exception")
def stop(self):
self._exit = True
self._engine.stop()
self._stream.close()
def _register(self):
self._stream.wait_for_ready()
request = consensus_pb2.ConsensusRegisterRequest(
name=self._engine.name(),
version=self._engine.version(),
).SerializeToString()
while True:
future = self._stream.send(
message_type=Message.CONSENSUS_REGISTER_REQUEST,
content=request)
response = consensus_pb2.ConsensusRegisterResponse()
response.ParseFromString(future.result(REGISTER_TIMEOUT).content)
if (
response.status
== consensus_pb2.ConsensusRegisterResponse.NOT_READY
):
continue
if response.status == consensus_pb2.ConsensusRegisterResponse.OK:
return StartupState(
response.chain_head,
response.peers,
response.local_peer_info)
raise exceptions.ReceiveError(
'Registration failed with status {}'.format(response.status))
def _process(self, message):
type_tag = message.message_type
if type_tag == Message.CONSENSUS_NOTIFY_PEER_CONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerConnected()
notification.ParseFromString(message.content)
data = notification.peer_info
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_DISCONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerDisconnected()
notification.ParseFromString(message.content)
data = notification.peer_id
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_MESSAGE:
notification = consensus_pb2.ConsensusNotifyPeerMessage()
notification.ParseFromString(message.content)
data = notification.message, notification.sender_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_NEW:
notification = consensus_pb2.ConsensusNotifyBlockNew()
notification.ParseFromString(message.content)
data = notification.block
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_VALID:
notification = consensus_pb2.ConsensusNotifyBlockValid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_INVALID:
notification = consensus_pb2.ConsensusNotifyBlockInvalid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_COMMIT:
notification = consensus_pb2.ConsensusNotifyBlockCommit()
notification.ParseFromString(message.content)
data = notification.block_id
else:
raise exceptions.ReceiveError(
'Received unexpected message type: {}'.format(type_tag))
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck().SerializeToString())
return type_tag, data
class ZmqDriver(Driver):
def __init__(self, engine):
super().__init__(engine)
self._engine = engine
self._stream = None
self._exit = False
self._updates = None
def start(self, endpoint):
self._stream = Stream(endpoint)
(chain_head, peers) = self._register()
self._updates = Queue()
engine_thread = Thread(
target=self._engine.start,
args=(self._updates,
ZmqService(stream=self._stream,
timeout=SERVICE_TIMEOUT,
name=self._engine.name(),
version=self._engine.version()), chain_head,
peers))
engine_thread.start()
while True:
if self._exit:
self._engine.stop()
engine_thread.join()
break
try:
message = self._stream.receive().result(0.1)
except concurrent.futures.TimeoutError:
continue
result = self._process(message)
self._updates.put(result)
def stop(self):
self._exit = True
self._stream.close()
def _register(self):
self._stream.wait_for_ready()
request = consensus_pb2.ConsensusRegisterRequest(
name=self._engine.name(),
version=self._engine.version(),
).SerializeToString()
while True:
future = self._stream.send(
message_type=Message.CONSENSUS_REGISTER_REQUEST,
content=request)
response = consensus_pb2.ConsensusRegisterResponse()
response.ParseFromString(future.result(REGISTER_TIMEOUT).content)
if (response.status ==
consensus_pb2.ConsensusRegisterResponse.NOT_READY):
continue
if response.status == consensus_pb2.ConsensusRegisterResponse.OK:
return (response.chain_head, response.peers)
raise exceptions.ReceiveError(
'Registration failed with status {}'.format(response.status))
def _process(self, message):
type_tag = message.message_type
if type_tag == Message.CONSENSUS_NOTIFY_PEER_CONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerConnected()
notification.ParseFromString(message.content)
data = notification.peer_info
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_DISCONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerDisconnected()
notification.ParseFromString(message.content)
data = notification.peer_id
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_MESSAGE:
notification = consensus_pb2.ConsensusNotifyPeerMessage()
notification.ParseFromString(message.content)
data = notification.message, notification.sender_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_NEW:
notification = consensus_pb2.ConsensusNotifyBlockNew()
notification.ParseFromString(message.content)
data = notification.block
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_VALID:
notification = consensus_pb2.ConsensusNotifyBlockValid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_INVALID:
notification = consensus_pb2.ConsensusNotifyBlockInvalid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_COMMIT:
notification = consensus_pb2.ConsensusNotifyBlockCommit()
notification.ParseFromString(message.content)
data = notification.block_id
else:
raise exceptions.ReceiveError(
'Received unexpected message type: {}'.format(type_tag))
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck().SerializeToString())
return type_tag, data
class ZmqDriver(Driver):
def __init__(self, engine):
super().__init__(engine)
self._engine = engine
self._stream = None
self._exit = False
self._updates = None
def start(self, endpoint):
self._stream = Stream(endpoint)
startup_state = self._register()
# Validators version 1.1 send startup info with the registration
# response; newer versions will send an activation message with the
# startup info
if startup_state is None:
startup_state = self._wait_until_active()
self._updates = Queue()
driver_thread = Thread(
target=self._driver_loop)
driver_thread.start()
try:
self._engine.start(
self._updates,
ZmqService(
stream=self._stream,
timeout=SERVICE_TIMEOUT),
startup_state)
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught engine exception")
self.stop()
driver_thread.join()
def _driver_loop(self):
try:
future = self._stream.receive()
while True:
if self._exit:
self._engine.stop()
break
try:
message = future.result(1)
future = self._stream.receive()
except concurrent.futures.TimeoutError:
continue
result = self._process(message)
self._updates.put(result)
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught driver exception")
def stop(self):
self._exit = True
self._engine.stop()
self._stream.close()
def _register(self):
self._stream.wait_for_ready()
request = consensus_pb2.ConsensusRegisterRequest(
name=self._engine.name(),
version=self._engine.version(),
).SerializeToString()
while True:
future = self._stream.send(
message_type=Message.CONSENSUS_REGISTER_REQUEST,
content=request)
response = consensus_pb2.ConsensusRegisterResponse()
response.ParseFromString(future.result(REGISTER_TIMEOUT).content)
if (
response.status
== consensus_pb2.ConsensusRegisterResponse.NOT_READY
):
continue
if response.status == consensus_pb2.ConsensusRegisterResponse.OK:
if (
response.HasField('chain_head')
and response.HasField('local_peer_info')
):
return StartupState(
response.chain_head,
response.peers,
response.local_peer_info)
return None
raise exceptions.ReceiveError(
'Registration failed with status {}'.format(response.status))
def _wait_until_active(self):
future = self._stream.receive()
while True:
try:
message = future.result(1)
except concurrent.futures.TimeoutError:
continue
if (
message.message_type
== Message.CONSENSUS_NOTIFY_ENGINE_ACTIVATED
):
notification = \
consensus_pb2.ConsensusNotifyEngineActivated()
notification.ParseFromString(message.content)
startup_state = StartupState(
notification.chain_head,
notification.peers,
notification.local_peer_info)
LOGGER.info(
'Received activation message with startup state: %s',
startup_state)
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck()
.SerializeToString())
return startup_state
LOGGER.warning('Received message type %s while waiting for \
activation message', message.message_type)
future = self._stream.receive()
def _process(self, message):
type_tag = message.message_type
if type_tag == Message.CONSENSUS_NOTIFY_PEER_CONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerConnected()
notification.ParseFromString(message.content)
data = notification.peer_info
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_DISCONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerDisconnected()
notification.ParseFromString(message.content)
data = notification.peer_id
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_MESSAGE:
notification = consensus_pb2.ConsensusNotifyPeerMessage()
notification.ParseFromString(message.content)
header = consensus_pb2.ConsensusPeerMessageHeader()
header.ParseFromString(notification.message.header)
peer_message = PeerMessage(
header=header,
header_bytes=notification.message.header,
header_signature=notification.message.header_signature,
content=notification.message.content)
data = peer_message, notification.sender_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_NEW:
notification = consensus_pb2.ConsensusNotifyBlockNew()
notification.ParseFromString(message.content)
data = notification.block
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_VALID:
notification = consensus_pb2.ConsensusNotifyBlockValid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_INVALID:
notification = consensus_pb2.ConsensusNotifyBlockInvalid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_COMMIT:
notification = consensus_pb2.ConsensusNotifyBlockCommit()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_ENGINE_DEACTIVATED:
self.stop()
data = None
else:
raise exceptions.ReceiveError(
'Received unexpected message type: {}'.format(type_tag))
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck().SerializeToString())
return type_tag, data
class SawtoothSubscriber:
def __init__(self, url, benchmark, expected_event_count):
self._event = '{}-{}'.format(benchmark, EVENT_SUFFIX)
self._url = url
self.counter = 0
self._is_active = False
self._expected_event_count = expected_event_count
self._stream = Stream('tcp://{}:4004'.format(self._url))
date = datetime.date.today()
logging_file_name = '{}-{}-benchmark-events.csv'.format(
str(date), benchmark)
self._event_log_file = path.join(DEFAULT_MONITORING_FOLDER,
logging_file_name)
def subscribe_to_event(self):
LOGGER.info("Subscribing to event {}".format(self._event))
done_sub = EventSubscription(event_type=self._event)
request = ClientEventsSubscribeRequest(subscriptions=[done_sub])
response_future = self._stream.send(
Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
request.SerializeToString())
sub_response = ClientEventsSubscribeResponse()
sub_response.ParseFromString(response_future.result().content)
if sub_response.status == ClientEventsSubscribeResponse.OK:
self._is_active = True
LOGGER.info('Subscription with response {}'.format(
sub_response.status))
else:
LOGGER.error('Could not Subscribe to event')
raise SubscriberError()
def stop_subscription(self):
self._is_active = False
def run(self) -> None:
if not self._is_active:
LOGGER.error('Subscriber is inactive, Quitting...')
return
LOGGER.info('Starting the logging on {}'.format(self._event_log_file))
with open(self._event_log_file, 'w+', newline='') as log_file:
writer = csv.writer(log_file)
writer.writerow(['time', 'events_received'])
while self._is_active:
LOGGER.debug('Waiting for events')
message_future = self._stream.receive()
event_list = EventList()
event_list.ParseFromString(message_future.result().content)
LOGGER.debug('Received {} event(s)'.format(
len(event_list.events)))
writer.writerow([time.time(), len(event_list.events)])
self.counter += len(event_list.events)
if self.counter == self._expected_event_count:
self._is_active = False
LOGGER.debug('Existing subscription loop')
class Subscriber(object):
"""Creates an object that can subscribe to state delta events using the
Sawtooth SDK's Stream class. Handler functions can be added prior to
subscribing, and each will be called on each delta event received.
"""
def __init__(self, validator_url):
LOGGER.info("Connecting to validator: %s", validator_url)
self._stream = Stream(validator_url)
self._delta_handlers = []
self._is_active = False
def add_handler(self, event_handler):
"""Adds a handler which will be passed state delta events when they
occur. Note that this event is mutable.
"""
self._delta_handlers.append(event_handler)
def clear_handlers(self):
"""Clears any delta handlers.
"""
self._delta_handlers = []
def start(self, known_ids=None):
"""Subscribes to state delta events, and then waits to receive deltas.
Sends any events received to delta handlers.
"""
self._stream.wait_for_ready()
LOGGER.debug("Subscribing to client state events")
request = client_event_pb2.ClientEventsSubscribeRequest(
last_known_block_ids=known_ids,
subscriptions=[
events_pb2.EventSubscription(
event_type="sawtooth/block-commit"),
events_pb2.EventSubscription(
event_type="sawtooth/state-delta",
filters=[
events_pb2.EventFilter(
key="address",
match_string="^" + addresser.NAMESPACE + ".*",
filter_type=events_pb2.EventFilter.REGEX_ANY,
)
],
),
],
)
response_future = self._stream.send(
Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
request.SerializeToString())
response = client_event_pb2.ClientEventsSubscribeResponse()
response.ParseFromString(response_future.result().content)
# Forked all the way back to genesis, restart with no known_ids
if (known_ids and response.status ==
client_event_pb2.ClientEventsSubscribeResponse.UNKNOWN_BLOCK):
return self.start()
if response.status != client_event_pb2.ClientEventsSubscribeResponse.OK:
raise RuntimeError("Subscription failed with status: {}".format(
client_event_pb2.ClientEventsSubscribeResponse.Status.Name(
response.status)))
self._is_active = True
LOGGER.debug("Successfully subscribed to state delta events")
while self._is_active:
message_future = self._stream.receive()
msg = message_future.result()
if msg.message_type == Message.CLIENT_EVENTS:
event_list = events_pb2.EventList()
event_list.ParseFromString(msg.content)
events = list(event_list.events)
event = StateDeltaEvent(events)
delta_count = len(event.state_changes)
if delta_count > 0:
LOGGER.debug("Received %d deltas for block: %s",
delta_count, event.block_id)
for handler in self._delta_handlers:
handler(event)
def stop(self):
"""Stops the Subscriber, unsubscribing from state delta events and
closing the the stream's connection.
"""
self._is_active = False
LOGGER.debug("Unsubscribing from client events")
request = client_event_pb2.ClientEventsUnsubscribeResponse()
response_future = self._stream.send(
Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString())
response = client_event_pb2.ClientEventsUnsubscribeResponse()
response.ParseFromString(response_future.result().content)
if response.status != client_event_pb2.ClientEventsUnsubscribeResponse.OK:
LOGGER.warning(
"Failed to unsubscribe with status: %s",
client_event_pb2.ClientEventsUnsubscribeResponse.Status.Name(
response.status),
)
self._stream.close()
class Subscriber(object):
"""Creates an object that can subscribe to state delta events using the
Sawtooth SDK's Stream class. Handler functions can be added prior to
subscribing, and each will be called on each delta event received.
"""
def __init__(self, validator_url):
LOGGER.info('Connecting to validator: %s', validator_url)
self._stream = Stream(validator_url)
self._event_handlers = []
self._is_active = False
def add_handler(self, handler):
"""Adds a handler which will be passed state delta events when they
occur. Note that this event is mutable.
"""
self._event_handlers.append(handler)
def clear_handlers(self):
"""Clears any delta handlers.
"""
self._event_handlers = []
def start(self, known_ids=None):
"""Subscribes to state delta events, and then waits to receive deltas.
Sends any events received to delta handlers.
"""
if not known_ids:
known_ids = [NULL_BLOCK_ID]
self._stream.wait_for_ready()
LOGGER.debug('Subscribing to state delta events')
block_sub = EventSubscription(event_type='sawtooth/block-commit')
delta_sub = EventSubscription(
event_type='sawtooth/state-delta',
filters=[
EventFilter(key='address',
match_string='^{}.*'.format(NAMESPACE),
filter_type=EventFilter.REGEX_ANY)
])
request = ClientEventsSubscribeRequest(
last_known_block_ids=known_ids,
subscriptions=[block_sub, delta_sub])
response_future = self._stream.send(
Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
request.SerializeToString())
response = ClientEventsSubscribeResponse()
response.ParseFromString(response_future.result().content)
# Forked all the way back to genesis, restart with no known_ids
if (response.status == ClientEventsSubscribeResponse.UNKNOWN_BLOCK
and known_ids):
return self.start()
if response.status != ClientEventsSubscribeResponse.OK:
raise RuntimeError('Subscription failed with status: {}'.format(
ClientEventsSubscribeResponse.Status.Name(response.status)))
self._is_active = True
LOGGER.debug('Successfully subscribed to state delta events')
while self._is_active:
message_future = self._stream.receive()
event_list = EventList()
event_list.ParseFromString(message_future.result().content)
for handler in self._event_handlers:
handler(event_list.events)
def stop(self):
"""Stops the Subscriber, unsubscribing from state delta events and
closing the the stream's connection.
"""
self._is_active = False
LOGGER.debug('Unsubscribing from state delta events')
request = ClientEventsUnsubscribeRequest()
response_future = self._stream.send(
Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString())
response = ClientEventsUnsubscribeResponse()
response.ParseFromString(response_future.result().content)
if response.status != ClientEventsUnsubscribeResponse.OK:
LOGGER.warning(
'Failed to unsubscribe with status: %s',
ClientEventsUnsubscribeResponse.Status.Name(response.status))
self._stream.close()
class TransactionProcessor:
"""TransactionProcessor is a generic class for communicating with a
validator and routing transaction processing requests to a registered
handler. It uses ZMQ and channels to handle requests concurrently.
"""
def __init__(self, url):
"""
Args:
url (string): The URL of the validator
"""
self._stream = Stream(url)
self._url = url
self._handlers = []
@property
def zmq_id(self):
return self._stream.zmq_id
def add_handler(self, handler):
"""Adds a transaction family handler
Args:
handler (TransactionHandler): the handler to be added
"""
self._handlers.append(handler)
def _matches(self, handler, header):
return header.family_name == handler.family_name \
and header.family_version in handler.family_versions
def _find_handler(self, header):
"""Find a handler for a particular (family_name, family_versions)
:param header transaction_pb2.TransactionHeader:
:return: handler
"""
try:
return next(
handler for handler in self._handlers
if self._matches(handler, header))
except StopIteration:
LOGGER.debug("Missing handler for header: %s", header)
return None
def _register_requests(self):
"""Returns all of the TpRegisterRequests for handlers
:return (list): list of TpRegisterRequests
"""
return itertools.chain.from_iterable( # flattens the nested list
[
[TpRegisterRequest(
family=n,
version=v,
namespaces=h.namespaces)
for n, v in itertools.product(
[h.family_name],
h.family_versions,)] for h in self._handlers])
def _unregister_request(self):
"""Returns a single TP_UnregisterRequest that requests
that the validator stop sending transactions for previously
registered handlers.
:return (processor_pb2.TpUnregisterRequest):
"""
return TpUnregisterRequest()
def _process(self, msg):
if msg.message_type != Message.TP_PROCESS_REQUEST:
LOGGER.debug(
"Transaction Processor recieved invalid message type. "
"Message type should be TP_PROCESS_REQUEST,"
" but is %s", Message.MessageType.Name(msg.message_type))
return
request = TpProcessRequest()
request.ParseFromString(msg.content)
state = Context(self._stream, request.context_id)
header = request.header
try:
if not self._stream.is_ready():
raise ValidatorConnectionError()
handler = self._find_handler(header)
if handler is None:
return
handler.apply(request, state)
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.OK
).SerializeToString())
except InvalidTransaction as it:
LOGGER.warning("Invalid Transaction %s", it)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INVALID_TRANSACTION,
message=str(it),
extended_data=it.extended_data
).SerializeToString())
except ValidatorConnectionError as vce:
# TP_PROCESS_REQUEST has made it through the
# handler.apply and an INVALID_TRANSACTION would have been
# sent back but the validator has disconnected and so it
# doesn't care about the response.
LOGGER.warning("during invalid transaction response: %s", vce)
except InternalError as ie:
LOGGER.warning("internal error: %s", ie)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INTERNAL_ERROR,
message=str(ie),
extended_data=ie.extended_data
).SerializeToString())
except ValidatorConnectionError as vce:
# Same as the prior except block, but an internal error has
# happened, but because of the disconnect the validator
# probably doesn't care about the response.
LOGGER.warning("during internal error response: %s", vce)
except ValidatorConnectionError as vce:
# Somewhere within handler.apply a future resolved with an
# error status that the validator has disconnected. There is
# nothing left to do but reconnect.
LOGGER.warning("during handler.apply a future was resolved "
"with error status: %s", vce)
except AuthorizationException as ae:
LOGGER.warning("AuthorizationException: %s", ae)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INVALID_TRANSACTION,
message=str(ae),
).SerializeToString())
except ValidatorConnectionError as vce:
# TP_PROCESS_REQUEST has made it through the
# handler.apply and an INVALID_TRANSACTION would have been
# sent back but the validator has disconnected and so it
# doesn't care about the response.
LOGGER.warning("during invalid transaction response: %s", vce)
def _process_future(self, future, timeout=None, sigint=False):
try:
msg = future.result(timeout)
except CancelledError:
# This error is raised when Task.cancel is called on
# disconnect from the validator in stream.py, for
# this future.
return
if msg is RECONNECT_EVENT:
if sigint is False:
LOGGER.info("reregistering with validator")
self._stream.wait_for_ready()
self._register()
else:
LOGGER.debug(
'received message of type: %s',
Message.MessageType.Name(msg.message_type))
if msg.message_type == Message.PING_REQUEST:
self._stream.send_back(
message_type=Message.PING_RESPONSE,
correlation_id=msg.correlation_id,
content=PingResponse().SerializeToString())
return
self._process(msg)
def _register(self):
futures = []
for message in self._register_requests():
self._stream.wait_for_ready()
future = self._stream.send(
message_type=Message.TP_REGISTER_REQUEST,
content=message.SerializeToString())
futures.append(future)
for future in futures:
resp = TpRegisterResponse()
try:
resp.ParseFromString(future.result().content)
LOGGER.info("register attempt: %s",
TpRegisterResponse.Status.Name(resp.status))
except ValidatorConnectionError as vce:
LOGGER.info("during waiting for response on registration: %s",
vce)
def _unregister(self):
message = self._unregister_request()
self._stream.wait_for_ready()
future = self._stream.send(
message_type=Message.TP_UNREGISTER_REQUEST,
content=message.SerializeToString())
response = TpUnregisterResponse()
try:
response.ParseFromString(future.result(1).content)
LOGGER.info("unregister attempt: %s",
TpUnregisterResponse.Status.Name(response.status))
except ValidatorConnectionError as vce:
LOGGER.info("during waiting for response on unregistration: %s",
vce)
def start(self):
"""Connects the transaction processor to a validator and starts
listening for requests and routing them to an appropriate
transaction handler.
"""
fut = None
try:
self._register()
while True:
# During long running processing this
# is where the transaction processor will
# spend most of its time
fut = self._stream.receive()
self._process_future(fut)
except KeyboardInterrupt:
try:
# tell the validator to not send any more messages
self._unregister()
while True:
if fut is not None:
# process futures as long as the tp has them,
# if the TP_PROCESS_REQUEST doesn't come from
# zeromq->asyncio in 1 second raise a
# concurrent.futures.TimeOutError and be done.
self._process_future(fut, 1, sigint=True)
fut = self._stream.receive()
except concurrent.futures.TimeoutError:
# Where the tp will usually exit after
# a KeyboardInterrupt. Caused by the 1 second
# timeout in _process_future.
pass
except FutureTimeoutError:
# If the validator is not able to respond to the
# unregister request, exit.
pass
def stop(self):
"""Closes the connection between the TransactionProcessor and the
validator.
"""
self._stream.close()
class Subscriber(object):
"""Creates an object that can subscribe to state delta events using the
Sawtooth SDK's Stream class. Handler functions can be added prior to
subscribing, and each will be called on each delta event received.
"""
def __init__(self, validator_url):
LOGGER.info('Connecting to validator: %s', validator_url)
self._stream = Stream(validator_url)
self._delta_handlers = []
self._is_active = False
def add_handler(self, event_handler):
"""Adds a handler which will be passed state delta events when they
occur. Note that this event is mutable.
"""
self._delta_handlers.append(event_handler)
def clear_handlers(self):
"""Clears any delta handlers.
"""
self._delta_handlers = []
def start(self, known_ids=None):
"""Subscribes to state delta events, and then waits to receive deltas.
Sends any events received to delta handlers.
"""
self._stream.wait_for_ready()
LOGGER.debug('Subscribing to state delta events')
request = StateDeltaSubscribeRequest(last_known_block_ids=known_ids,
address_prefixes=[NAMESPACE])
response_future = self._stream.send(
Message.STATE_DELTA_SUBSCRIBE_REQUEST, request.SerializeToString())
response = StateDeltaSubscribeResponse()
response.ParseFromString(response_future.result().content)
# Forked all the way back to genesis, restart with no known_ids
if (known_ids and response.status
== StateDeltaSubscribeResponse.UNKNOWN_BLOCK):
return self.start()
if response.status != StateDeltaSubscribeResponse.OK:
raise RuntimeError('Subscription failed with status: {}'.format(
StateDeltaSubscribeResponse.Status.Name(response.status)))
self._is_active = True
LOGGER.debug('Successfully subscribed to state delta events')
while self._is_active:
message_future = self._stream.receive()
event = StateDeltaEvent()
event.ParseFromString(message_future.result().content)
LOGGER.debug('Received deltas for block: %s', event.block_id)
for handler in self._delta_handlers:
handler(event)
def stop(self):
"""Stops the Subscriber, unsubscribing from state delta events and
closing the the stream's connection.
"""
self._is_active = False
LOGGER.debug('Unsubscribing from state delta events')
request = StateDeltaUnsubscribeRequest()
response_future = self._stream.send(
Message.STATE_DELTA_UNSUBSCRIBE_REQUEST,
request.SerializeToString())
response = StateDeltaUnsubscribeResponse()
response.ParseFromString(response_future.result().content)
if response.status != StateDeltaUnsubscribeResponse.OK:
LOGGER.warning(
'Failed to unsubscribe with status: %s',
StateDeltaUnsubscribeResponse.Status.Name(response.status))
self._stream.close()
class SyncProcessor:
future: Optional["Future"] = None
_stream: Stream
def __init__(self, url=None):
self._stream = Stream(url or VALIDATOR_URL)
self._handlers = []
def add_handler(self, handler: Type["HandlerBase"]):
if handler not in self._handlers:
LOG.info(f"Add handler {handler.__name__}")
self._handlers.append(handler)
def start(self):
LOG.info("Start SyncProcessor")
future = None
try:
self._register()
while True:
future = self._stream.receive()
self._process_future(future)
except KeyboardInterrupt:
LOG.warning("break")
try:
# tell the validator to not send any more messages
self._unregister()
while True:
if future is not None:
# process futures as long as the tp has them,
# if the TP_PROCESS_REQUEST doesn't come from
# zeromq->asyncio in 1 second raise a
# concurrent.futures.TimeOutError and be done.
self._process_future(future, 1, sigint=True)
future = self._stream.receive()
except ConcurrentTimeoutError:
# Where the tp will usually exit after
# a KeyboardInterrupt. Caused by the 1 second
# timeout in _process_future.
pass
except FutureTimeoutError:
# If the validator is not able to respond to the
# unregister request, exit.
pass
def _unregister(self):
LOG.warning("unregister")
pass
def _register(self):
LOG.debug(f"Register handlers")
self._stream.wait_for_ready()
future = self._stream.send(
message_type=Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
content=ClientEventsSubscribeRequest(
last_known_block_ids=[NULL_BLOCK_ID],
subscriptions=[
EventSubscription(event_type="sawtooth/block-commit"),
EventSubscription(
event_type="sawtooth/state-delta",
filters=[
EventFilter(
key="address",
match_string=f"^{Namespaces.GA_NAMESPACE}.*",
filter_type=EventFilter.REGEX_ANY,
)
],
),
],
).SerializeToString(),
)
resp = TpRegisterResponse()
try:
resp.ParseFromString(future.result().content)
LOG.info("Register response: %s",
TpRegisterResponse.Status.Name(resp.status))
except ValidatorConnectionError as vce:
LOG.info("During waiting for response on registration: %s", vce)
except Exception as e:
LOG.info("During waiting for response on registration: %s", e)
def _process_future(self,
future: "Future",
timeout=None,
sigint=False) -> None:
try:
msg = future.result(timeout)
except CancelledError:
# This error is raised when Task.cancel is called on
# disconnect from the validator in stream.py, for
# this future.
LOG.error("Cancelled")
return
if msg is RECONNECT_EVENT:
if sigint is False:
LOG.info("Reregistering with validator")
self._stream.wait_for_ready()
self._register()
else:
LOG.debug(f"Received message of type: "
f"{Message.MessageType.Name(msg.message_type)}")
if msg.message_type == Message.PING_REQUEST:
self._stream.send_back(
message_type=Message.PING_RESPONSE,
correlation_id=msg.correlation_id,
content=PingResponse().SerializeToString(),
)
return
elif msg.message_type == Message.CLIENT_EVENTS:
self._process(msg)
return
LOG.warning(f"SyncProcessor got wrong message type: "
f"{Message.MessageType.Name(msg.message_type)}")
def _process(self, msg: Message) -> None:
event_list = EventList()
event_list.ParseFromString(msg.content)
events = event_list.events
raw_block = next(
(e for e in events if e.event_type == "sawtooth/block-commit"), [])
block = {b.key: b.value for b in raw_block.attributes}
LOG.debug(f"Block: {block}")
event = next(
(e for e in events if e.event_type == "sawtooth/state-delta"),
None)
if event:
state_changes = StateChangeList()
state_changes.ParseFromString(event.data)
changes = list(state_changes.state_changes)
LOG.debug(f"Found {len(changes)} state changes")
self._handle_changes(block, changes)
def _handle_changes(self, block: dict, changes: list):
# r.table(Tbl.BLOCKS).insert(block).run()
for change in changes:
for handler in self._handlers:
if change.address.startswith(handler.prefix):
handler.process(change)
class ZmqDriver(Driver):
def __init__(self, engine):
super().__init__(engine)
self._engine = engine
self._stream = None
self._exit = False
self._updates = None
def start(self, endpoint):
self._stream = Stream(endpoint)
startup_state = self._register()
# Validators version 1.1 send startup info with the registration
# response; newer versions will send an activation message with the
# startup info
if startup_state is None:
startup_state = self._wait_until_active()
self._updates = Queue()
driver_thread = Thread(
target=self._driver_loop)
driver_thread.start()
try:
self._engine.start(
self._updates,
ZmqService(
stream=self._stream,
timeout=SERVICE_TIMEOUT),
startup_state)
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught engine exception")
self.stop()
driver_thread.join()
def _driver_loop(self):
try:
future = self._stream.receive()
while True:
if self._exit:
self._engine.stop()
break
try:
message = future.result(1)
future = self._stream.receive()
except concurrent.futures.TimeoutError:
continue
try:
result = self._process(message)
# if message was a ping ignore
if result[0] == Message.PING_REQUEST:
continue
self._updates.put(result)
except exceptions.ReceiveError as err:
LOGGER.warning("%s", err)
continue
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught driver exception")
def stop(self):
self._exit = True
self._engine.stop()
self._stream.close()
def _register(self):
self._stream.wait_for_ready()
request = consensus_pb2.ConsensusRegisterRequest(
name=self._engine.name(),
version=self._engine.version(),
)
for (name, version) in self._engine.additional_protocols():
protocol = request.additional_protocols.add()
protocol.name = name
protocol.version = version
while True:
future = self._stream.send(
message_type=Message.CONSENSUS_REGISTER_REQUEST,
content=request.SerializeToString())
response = consensus_pb2.ConsensusRegisterResponse()
response.ParseFromString(future.result(REGISTER_TIMEOUT).content)
if (
response.status
== consensus_pb2.ConsensusRegisterResponse.NOT_READY
):
continue
if response.status == consensus_pb2.ConsensusRegisterResponse.OK:
if (
response.HasField('chain_head')
and response.HasField('local_peer_info')
):
return StartupState(
response.chain_head,
response.peers,
response.local_peer_info)
return None
raise exceptions.ReceiveError(
'Registration failed with status {}'.format(response.status))
def _wait_until_active(self):
future = self._stream.receive()
while True:
try:
message = future.result(1)
except concurrent.futures.TimeoutError:
continue
if (
message.message_type
== Message.CONSENSUS_NOTIFY_ENGINE_ACTIVATED
):
notification = \
consensus_pb2.ConsensusNotifyEngineActivated()
notification.ParseFromString(message.content)
startup_state = StartupState(
notification.chain_head,
notification.peers,
notification.local_peer_info)
LOGGER.info(
'Received activation message with startup state: %s',
startup_state)
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck()
.SerializeToString())
return startup_state
LOGGER.warning('Received message type %s while waiting for \
activation message', message.message_type)
future = self._stream.receive()
def _process(self, message):
type_tag = message.message_type
if type_tag == Message.CONSENSUS_NOTIFY_PEER_CONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerConnected()
notification.ParseFromString(message.content)
data = notification.peer_info
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_DISCONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerDisconnected()
notification.ParseFromString(message.content)
data = notification.peer_id
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_MESSAGE:
notification = consensus_pb2.ConsensusNotifyPeerMessage()
notification.ParseFromString(message.content)
header = consensus_pb2.ConsensusPeerMessageHeader()
header.ParseFromString(notification.message.header)
peer_message = PeerMessage(
header=header,
header_bytes=notification.message.header,
header_signature=notification.message.header_signature,
content=notification.message.content)
data = peer_message, notification.sender_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_NEW:
notification = consensus_pb2.ConsensusNotifyBlockNew()
notification.ParseFromString(message.content)
data = notification.block
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_VALID:
notification = consensus_pb2.ConsensusNotifyBlockValid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_INVALID:
notification = consensus_pb2.ConsensusNotifyBlockInvalid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_COMMIT:
notification = consensus_pb2.ConsensusNotifyBlockCommit()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_ENGINE_DEACTIVATED:
self.stop()
data = None
elif type_tag == Message.PING_REQUEST:
data = None
else:
raise exceptions.ReceiveError(
'Received unexpected message type: {}'.format(type_tag))
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck().SerializeToString())
return type_tag, data
class TransactionProcessor:
"""TransactionProcessor is a generic class for communicating with a
validator and routing transaction processing requests to a registered
handler. It uses ZMQ and channels to handle requests concurrently.
"""
# This is the version used by SDK to match if validator supports feature
# it requested during registration. It should only be incremented when
# there are changes in TpRegisterRequest. Remember to sync this
# information in validator if changed.
# Note: SDK_PROTOCOL_VERSION is the highest version the SDK supports
class _FeatureVersion(Enum):
FEATURE_UNUSED = 0
FEATURE_CUSTOM_HEADER_STYLE = 1
SDK_PROTOCOL_VERSION = 1
def __init__(self, url):
"""
Args:
url (string): The URL of the validator
"""
self._stream = Stream(url)
self._url = url
self._handlers = []
self._highest_sdk_feature_requested = \
self._FeatureVersion.FEATURE_UNUSED
self._header_style = TpRegisterRequest.HEADER_STYLE_UNSET
@property
def zmq_id(self):
return self._stream.zmq_id
def add_handler(self, handler):
"""Adds a transaction family handler
Args:
handler (TransactionHandler): the handler to be added
"""
self._handlers.append(handler)
def set_header_style(self, style):
"""Sets a flag to request the validator for custom transaction header
style in TpProcessRequest.
Args:
style (TpProcessRequestHeaderStyle): enum value to set header style
"""
if self._FeatureVersion.FEATURE_CUSTOM_HEADER_STYLE.value > \
self._highest_sdk_feature_requested.value:
self._highest_sdk_feature_requested = \
self._FeatureVersion.FEATURE_CUSTOM_HEADER_STYLE
self._header_style = style
def _matches(self, handler, header):
return header.family_name == handler.family_name \
and header.family_version in handler.family_versions
def _find_handler(self, header):
"""Find a handler for a particular (family_name, family_versions)
:param header transaction_pb2.TransactionHeader:
:return: handler
"""
try:
return next(handler for handler in self._handlers
if self._matches(handler, header))
except StopIteration:
LOGGER.debug("Missing handler for header: %s", header)
return None
def _register_requests(self):
"""Returns all of the TpRegisterRequests for handlers
:return (list): list of TpRegisterRequests
"""
return itertools.chain.from_iterable( # flattens the nested list
[[
TpRegisterRequest(
family=n,
version=v,
namespaces=h.namespaces,
protocol_version=self._highest_sdk_feature_requested.value,
request_header_style=self._header_style)
for n, v in itertools.product(
[h.family_name],
h.family_versions,
)
] for h in self._handlers])
def _unregister_request(self):
"""Returns a single TP_UnregisterRequest that requests
that the validator stop sending transactions for previously
registered handlers.
:return (processor_pb2.TpUnregisterRequest):
"""
return TpUnregisterRequest()
def _process(self, msg):
if msg.message_type != Message.TP_PROCESS_REQUEST:
LOGGER.debug(
"Transaction Processor recieved invalid message type. "
"Message type should be TP_PROCESS_REQUEST,"
" but is %s", Message.MessageType.Name(msg.message_type))
return
request = TpProcessRequest()
request.ParseFromString(msg.content)
state = Context(self._stream, request.context_id)
if self._header_style == TpRegisterRequest.RAW:
header = TransactionHeader()
header.ParseFromString(request.header_bytes)
else:
header = request.header
try:
if not self._stream.is_ready():
raise ValidatorConnectionError()
handler = self._find_handler(header)
if handler is None:
return
handler.apply(request, state)
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.OK).SerializeToString())
except InvalidTransaction as it:
LOGGER.warning("Invalid Transaction %s", it)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INVALID_TRANSACTION,
message=str(it),
extended_data=it.extended_data).SerializeToString())
except ValidatorConnectionError as vce:
# TP_PROCESS_REQUEST has made it through the
# handler.apply and an INVALID_TRANSACTION would have been
# sent back but the validator has disconnected and so it
# doesn't care about the response.
LOGGER.warning("during invalid transaction response: %s", vce)
except InternalError as ie:
LOGGER.warning("internal error: %s", ie)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INTERNAL_ERROR,
message=str(ie),
extended_data=ie.extended_data).SerializeToString())
except ValidatorConnectionError as vce:
# Same as the prior except block, but an internal error has
# happened, but because of the disconnect the validator
# probably doesn't care about the response.
LOGGER.warning("during internal error response: %s", vce)
except ValidatorConnectionError as vce:
# Somewhere within handler.apply a future resolved with an
# error status that the validator has disconnected. There is
# nothing left to do but reconnect.
LOGGER.warning(
"during handler.apply a future was resolved "
"with error status: %s", vce)
except AuthorizationException as ae:
LOGGER.warning("AuthorizationException: %s", ae)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INVALID_TRANSACTION,
message=str(ae),
).SerializeToString())
except ValidatorConnectionError as vce:
# TP_PROCESS_REQUEST has made it through the
# handler.apply and an INVALID_TRANSACTION would have been
# sent back but the validator has disconnected and so it
# doesn't care about the response.
LOGGER.warning("during invalid transaction response: %s", vce)
def _process_future(self, future, timeout=None, sigint=False):
try:
msg = future.result(timeout)
except CancelledError:
# This error is raised when Task.cancel is called on
# disconnect from the validator in stream.py, for
# this future.
return
if msg is RECONNECT_EVENT:
if sigint is False:
LOGGER.info("reregistering with validator")
self._stream.wait_for_ready()
self._register()
else:
LOGGER.debug('received message of type: %s',
Message.MessageType.Name(msg.message_type))
if msg.message_type == Message.PING_REQUEST:
self._stream.send_back(
message_type=Message.PING_RESPONSE,
correlation_id=msg.correlation_id,
content=PingResponse().SerializeToString())
return
self._process(msg)
def _register(self):
futures = []
for message in self._register_requests():
self._stream.wait_for_ready()
future = self._stream.send(
message_type=Message.TP_REGISTER_REQUEST,
content=message.SerializeToString())
futures.append(future)
for future in futures:
resp = TpRegisterResponse()
try:
resp.ParseFromString(future.result().content)
if resp.protocol_version != \
self._highest_sdk_feature_requested.value:
LOGGER.error(
"Validator version %s does not support "
"requested feature by SDK version %s. "
"Unregistering with the validator.",
str(resp.protocol_version),
str(self._highest_sdk_feature_requested.value))
raise ValidatorVersionError()
LOGGER.info("register attempt: %s",
TpRegisterResponse.Status.Name(resp.status))
if resp.status == TpRegisterResponse.ERROR:
raise RuntimeError("Transaction processor registration "
"failed")
except ValidatorConnectionError as vce:
LOGGER.info("during waiting for response on registration: %s",
vce)
def _unregister(self):
message = self._unregister_request()
self._stream.wait_for_ready()
future = self._stream.send(message_type=Message.TP_UNREGISTER_REQUEST,
content=message.SerializeToString())
response = TpUnregisterResponse()
try:
response.ParseFromString(future.result(1).content)
LOGGER.info("unregister attempt: %s",
TpUnregisterResponse.Status.Name(response.status))
except ValidatorConnectionError as vce:
LOGGER.info("during waiting for response on unregistration: %s",
vce)
def start(self):
"""Connects the transaction processor to a validator and starts
listening for requests and routing them to an appropriate
transaction handler.
"""
fut = None
try:
self._register()
while True:
# During long running processing this
# is where the transaction processor will
# spend most of its time
fut = self._stream.receive()
self._process_future(fut)
except (KeyboardInterrupt, ValidatorVersionError):
try:
# tell the validator to not send any more messages
self._unregister()
while True:
if fut is not None:
# process futures as long as the tp has them,
# if the TP_PROCESS_REQUEST doesn't come from
# zeromq->asyncio in 1 second raise a
# concurrent.futures.TimeOutError and be done.
self._process_future(fut, 1, sigint=True)
fut = self._stream.receive()
except concurrent.futures.TimeoutError:
# Where the tp will usually exit after
# a KeyboardInterrupt. Caused by the 1 second
# timeout in _process_future.
pass
except FutureTimeoutError:
# If the validator is not able to respond to the
# unregister request, exit.
pass
except RuntimeError as e:
LOGGER.error("Error: %s", e)
self.stop()
def stop(self):
"""Closes the connection between the TransactionProcessor and the
validator.
"""
self._stream.close()
class ZmqDriver(Driver):
def __init__(self, engine):
super().__init__(engine)
self._engine = engine
self._stream = None
self._exit = False
self._updates = None
def start(self, endpoint):
LOGGER.debug('ZmqDriver: start endpoint=%s', endpoint)
self._stream = Stream(endpoint)
startup_state = self._register()
self._updates = Queue()
driver_thread = Thread(target=self._driver_loop)
driver_thread.start()
try:
self._engine.start(
self._updates,
ZmqService(stream=self._stream,
timeout=SERVICE_TIMEOUT,
name=self._engine.name(),
version=self._engine.version()), startup_state)
except Exception as ex: # pylint: disable=broad-except
LOGGER.exception("Uncaught engine exception(%s)", ex)
self.stop()
driver_thread.join()
def _driver_loop(self):
try:
future = self._stream.receive()
LOGGER.debug('ZmqDriver: _driver_loop future=%s', future)
while True:
if self._exit:
self._engine.stop()
break
try:
message = future.result(1)
future = self._stream.receive()
except concurrent.futures.TimeoutError:
continue
#LOGGER.debug('ZmqDriver: _driver_loop _process')
result = self._process(message)
self._updates.put(result)
except Exception: # pylint: disable=broad-except
LOGGER.exception("Uncaught driver exception")
def stop(self):
self._exit = True
self._engine.stop()
self._stream.close()
def _register(self):
self._stream.wait_for_ready()
request = consensus_pb2.ConsensusRegisterRequest(
name=self._engine.name(),
version=self._engine.version(),
).SerializeToString()
while True:
future = self._stream.send(
message_type=Message.CONSENSUS_REGISTER_REQUEST,
content=request)
response = consensus_pb2.ConsensusRegisterResponse()
response.ParseFromString(future.result(REGISTER_TIMEOUT).content)
if (response.status ==
consensus_pb2.ConsensusRegisterResponse.NOT_READY):
#LOGGER.debug('ZmqDriver:register NOT_READY: url=%s',self._stream._url)
continue
if response.status == consensus_pb2.ConsensusRegisterResponse.OK:
LOGGER.debug('ZmqDriver:register DONE: url=%s',
self._stream._url)
return StartupState(response.chain_head, response.peers,
response.local_peer_info,
response.peering_mode)
raise exceptions.ReceiveError(
'Registration failed with status {}'.format(response.status))
def _process(self, message):
type_tag = message.message_type
if type_tag == Message.CONSENSUS_NOTIFY_PEER_CONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerConnected()
notification.ParseFromString(message.content)
data = notification.peer_info, notification.status, notification.mode, notification.info
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_DISCONNECTED:
notification = consensus_pb2.ConsensusNotifyPeerDisconnected()
notification.ParseFromString(message.content)
data = notification.peer_id
elif type_tag == Message.CONSENSUS_NOTIFY_PEER_MESSAGE:
notification = consensus_pb2.ConsensusNotifyPeerMessage()
notification.ParseFromString(message.content)
data = notification.message, notification.sender_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_NEW:
notification = consensus_pb2.ConsensusNotifyBlockNew()
notification.ParseFromString(message.content)
data = notification.block
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_VALID:
notification = consensus_pb2.ConsensusNotifyBlockValid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_INVALID:
notification = consensus_pb2.ConsensusNotifyBlockInvalid()
notification.ParseFromString(message.content)
data = notification.block_id
elif type_tag == Message.CONSENSUS_NOTIFY_BLOCK_COMMIT:
notification = consensus_pb2.ConsensusNotifyBlockCommit()
notification.ParseFromString(message.content)
data = notification.block_id
else:
raise exceptions.ReceiveError(
'Received unexpected message type: {}'.format(type_tag))
self._stream.send_back(
message_type=Message.CONSENSUS_NOTIFY_ACK,
correlation_id=message.correlation_id,
content=consensus_pb2.ConsensusNotifyAck().SerializeToString())
return type_tag, data
def listen_to_events(delta_filters=None):
BenLogDB.set_table('beneficiary_log',
'(id,beneficiary_id,beneficiary_type_id)')
'''Listen to vaccination state-delta events.'''
# Subscribe to events
add_beneficiary_subscription = events_pb2.EventSubscription(
event_type="Beneficiary/Add_Beneficiary", filters=delta_filters)
block_commit_subscription = events_pb2.EventSubscription(
event_type="sawtooth/block-commit", filters=delta_filters)
#Create subscription request
requestBen = client_event_pb2.ClientEventsSubscribeRequest(
subscriptions=[
block_commit_subscription, add_beneficiary_subscription
],
last_known_block_ids=['0000000000000000'])
# Send the subscription request
streamBen = Stream(BEN_VALIDATOR_URL)
msgBen = streamBen.send(
message_type=Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
content=requestBen.SerializeToString()).result()
assert msgBen.message_type == Message.CLIENT_EVENTS_SUBSCRIBE_RESPONSE
# Parse the subscription response
responseBen = client_event_pb2.ClientEventsSubscribeResponse()
responseBen.ParseFromString(msgBen.content)
assert responseBen.status == client_event_pb2.ClientEventsSubscribeResponse.OK
# Listen for events in an infinite loop
while True:
msgBen = streamBen.receive().result()
assert msgBen.message_type == Message.CLIENT_EVENTS
# Parse the response
event_list_ben = events_pb2.EventList()
event_list_ben.ParseFromString(msgBen.content)
# Log each Beneficiary event into the DB
for event in event_list_ben.events:
if event.event_type == "Beneficiary/Add_Beneficiary":
print("Received the beneficiry event", flush=True)
print("Beneficiary ID : ",
event.attributes[0].value,
flush=True)
print("Beneficiary Type : ",
event.attributes[1].value,
flush=True)
BenLogDB.insert_data(
uuid.uuid4(), #uuid
event.attributes[0].value, #beneficiaryId
event.attributes[1].value) #beneficiaryType
# Unsubscribe from events
request = client_event_pb2.ClientEventsUnsubscribeRequest()
msg = stream.send(Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_UNSUBSCRIBE_RESPONSE
# Parse the unsubscribe response
response = client_event_pb2.ClientEventsUnsubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsUnsubscribeResponse.OK
def listen_to_events(delta_filters=None):
'''Listen to all state-delta events from the attestation TF.'''
trustQueryHits = 0
trustQueryMisses = 0
# Subscribe to events
evidence_submission_subscription = events_pb2.EventSubscription(
event_type="attestation/evidence_submission", filters=delta_filters)
evidence_deletion_subscription = events_pb2.EventSubscription(
event_type="attestation/evidence_deletion", filters=delta_filters)
trust_path_subscription = events_pb2.EventSubscription(
event_type="attestation/trustpath", filters=delta_filters)
trust_entry_subscription = events_pb2.EventSubscription(
event_type="attestation/entrypoint", filters=delta_filters)
request = client_event_pb2.ClientEventsSubscribeRequest(
subscriptions=[evidence_submission_subscription, evidence_deletion_subscription, trust_path_subscription, trust_entry_subscription])
'''
block_commit_subscription = events_pb2.EventSubscription(
event_type="sawtooth/block-commit")
state_delta_subscription = events_pb2.EventSubscription(
event_type="sawtooth/state-delta", filters=delta_filters)
request = client_event_pb2.ClientEventsSubscribeRequest(
subscriptions=[block_commit_subscription, state_delta_subscription])
'''
# Send the subscription request
stream = Stream(DEFAULT_VALIDATOR_URL)
msg = stream.send(message_type=Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
content=request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_SUBSCRIBE_RESPONSE
# Parse the subscription response
response = client_event_pb2.ClientEventsSubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsSubscribeResponse.OK
# Listen for events in an infinite loop
print("Listening to events.")
lastevent = None
while True:
msg = stream.receive().result()
assert msg.message_type == Message.CLIENT_EVENTS
# Parse the response
event_list = events_pb2.EventList()
event_list.ParseFromString(msg.content)
print("Received the following events: ----------")
for event in event_list.events:
if event == lastevent:
continue
else:
lastevent = event
print(event)
if (event.event_type == "attestation/evidence_submission"):
vrf = event.attributes[0].value
prv = event.attributes[1].value
writeEdgeData(vrf, prv)
elif (event.event_type == "attestation/evidence_deletion"):
vrf = event.attributes[0].value
prv = event.attributes[1].value
deleteEdgeData(vrf, prv)
elif (event.event_type == "attestation/trustpath"):
trustQueryHits +=1
elif (event.event_type == "attestation/entrypoint"):
trustQueryMisses +=1
# Unsubscribe from events
request = client_event_pb2.ClientEventsUnsubscribeRequest()
msg = stream.send(Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString()).result()
assert msg.message_type == Message.CLIENT_EVENTS_UNSUBSCRIBE_RESPONSE
# Parse the unsubscribe response
response = client_event_pb2.ClientEventsUnsubscribeResponse()
response.ParseFromString(msg.content)
assert response.status == \
client_event_pb2.ClientEventsUnsubscribeResponse.OK
class TransactionProcessor(object):
def __init__(self, url):
self._stream = Stream(url)
self._url = url
self._handlers = []
@property
def zmq_id(self):
return self._stream.zmq_id
def add_handler(self, handler):
"""Add a transaction family handler
:param handler:
"""
self._handlers.append(handler)
def _matches(self, handler, header):
return header.family_name == handler.family_name \
and header.family_version in handler.family_versions \
and header.payload_encoding in handler.encodings
def _find_handler(self, header):
"""Find a handler for a particular (family_name,
family_versions, payload_encoding)
:param header transaction_pb2.TransactionHeader:
:return: handler
"""
try:
return next(handler for handler in self._handlers
if self._matches(handler, header))
except StopIteration:
LOGGER.debug("Missing handler for header: %s", header)
return None
def _register_requests(self):
"""Returns all of the TpRegisterRequests for handlers
:return (list): list of TpRegisterRequests
"""
return itertools.chain.from_iterable( # flattens the nested list
[[
TpRegisterRequest(family=n,
version=v,
encoding=e,
namespaces=h.namespaces)
for n, v, e in itertools.product(
[h.family_name], h.family_versions, h.encodings)
] for h in self._handlers])
def _unregister_request(self):
"""Returns a single TP_UnregisterRequest that requests
that the validator stop sending transactions for previously
registered handlers.
:return (processor_pb2.TpUnregisterRequest):
"""
return TpUnregisterRequest()
def _process(self, msg):
if msg.message_type != Message.TP_PROCESS_REQUEST:
LOGGER.debug(
"Transaction Processor recieved invalid message type. "
"Message type should be TP_PROCESS_REQUEST,"
" but is %s", Message.MessageType.Name(msg.message_type))
return
request = TpProcessRequest()
request.ParseFromString(msg.content)
state = State(self._stream, request.context_id)
header = TransactionHeader()
header.ParseFromString(request.header)
try:
if not self._stream.is_ready():
raise ValidatorConnectionError()
handler = self._find_handler(header)
if handler is None:
return
handler.apply(request, state)
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.OK).SerializeToString())
except InvalidTransaction as it:
LOGGER.warning("Invalid Transaction %s", it)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INVALID_TRANSACTION,
message=str(it),
extended_data=it.extended_data).SerializeToString())
except ValidatorConnectionError as vce:
# TP_PROCESS_REQUEST has made it through the
# handler.apply and an INVALID_TRANSACTION would have been
# sent back but the validator has disconnected and so it
# doesn't care about the response.
LOGGER.warning("during invalid transaction response: %s", vce)
except InternalError as ie:
LOGGER.warning("internal error: %s", ie)
try:
self._stream.send_back(
message_type=Message.TP_PROCESS_RESPONSE,
correlation_id=msg.correlation_id,
content=TpProcessResponse(
status=TpProcessResponse.INTERNAL_ERROR,
message=str(ie),
extended_data=ie.extended_data).SerializeToString())
except ValidatorConnectionError as vce:
# Same as the prior except block, but an internal error has
# happened, but because of the disconnect the validator
# probably doesn't care about the response.
LOGGER.warning("during internal error response: %s", vce)
except ValidatorConnectionError as vce:
# Somewhere within handler.apply a future resolved with an
# error status that the validator has disconnected. There is
# nothing left to do but reconnect.
LOGGER.warning(
"during handler.apply a future was resolved "
"with error status: %s", vce)
def _process_future(self, future, timeout=None, sigint=False):
try:
msg = future.result(timeout)
except CancelledError:
# This error is raised when Task.cancel is called on
# disconnect from the validator in stream.py, for
# this future.
return
if msg is RECONNECT_EVENT:
if sigint is False:
LOGGER.info("reregistering with validator")
self._stream.wait_for_ready()
self._register()
else:
LOGGER.debug('received message of type: %s',
Message.MessageType.Name(msg.message_type))
if msg.message_type == Message.TP_PING:
self._stream.send_back(
message_type=Message.TP_PING_RESPONSE,
correlation_id=msg.correlation_id,
content=TpPingResponse(
status=TpPingResponse.OK).SerializeToString())
return
self._process(msg)
def _register(self):
futures = []
for message in self._register_requests():
self._stream.wait_for_ready()
future = self._stream.send(
message_type=Message.TP_REGISTER_REQUEST,
content=message.SerializeToString())
futures.append(future)
for future in futures:
resp = TpRegisterResponse()
try:
resp.ParseFromString(future.result().content)
LOGGER.info("register attempt: %s",
TpRegisterResponse.Status.Name(resp.status))
except ValidatorConnectionError as vce:
LOGGER.info("during waiting for response on registration: %s",
vce)
def _unregister(self):
message = self._unregister_request()
self._stream.wait_for_ready()
future = self._stream.send(message_type=Message.TP_UNREGISTER_REQUEST,
content=message.SerializeToString())
response = TpUnregisterResponse()
try:
response.ParseFromString(future.result(1).content)
LOGGER.info("unregister attempt: %s",
TpUnregisterResponse.Status.Name(response.status))
except ValidatorConnectionError as vce:
LOGGER.info("during waiting for response on unregistration: %s",
vce)
def start(self):
fut = None
try:
self._register()
while True:
# During long running processing this
# is where the transaction processor will
# spend most of its time
fut = self._stream.receive()
self._process_future(fut)
except KeyboardInterrupt:
try:
# tell the validator to not send any more messages
self._unregister()
while True:
if fut is not None:
# process futures as long as the tp has them,
# if the TP_PROCESS_REQUEST doesn't come from
# zeromq->asyncio in 1 second raise a
# concurrent.futures.TimeOutError and be done.
self._process_future(fut, 1, sigint=True)
fut = self._stream.receive()
except concurrent.futures.TimeoutError:
# Where the tp will usually exit after
# a KeyboardInterrupt. Caused by the 1 second
# timeout in _process_future.
pass
except FutureTimeoutError:
# If the validator is not able to respond to the
# unregister request, exit.
pass
def stop(self):
self._stream.close()
class Subscriber(object):
"""Creates an object that can subscribe to state delta events using the
Sawtooth SDK's Stream class. Handler functions can be added prior to
subscribing, and each will be called on each delta event received.
"""
def __init__(self, validator_url):
LOGGER.info('Connecting to validator: %s', validator_url)
self._stream = Stream(validator_url)
self._event_handlers = []
self._is_active = False
def add_handler(self, handler):
"""Adds a handler which will be passed state delta events when they
occur. Note that this event is mutable.
"""
self._event_handlers.append(handler)
def clear_handlers(self):
"""Clears any delta handlers.
"""
self._event_handlers = []
def start(self, known_ids=None):
"""Subscribes to state delta events, and then waits to receive deltas.
Sends any events received to delta handlers.
"""
if not known_ids:
known_ids = [NULL_BLOCK_ID]
self._stream.wait_for_ready()
LOGGER.debug('Subscribing to state delta events')
block_sub = EventSubscription(event_type='sawtooth/block-commit')
delta_sub = EventSubscription(
event_type='sawtooth/state-delta',
filters=[EventFilter(
key='address',
match_string='^{}.*'.format(NAMESPACE),
filter_type=EventFilter.REGEX_ANY)])
request = ClientEventsSubscribeRequest(
last_known_block_ids=known_ids,
subscriptions=[block_sub, delta_sub])
response_future = self._stream.send(
Message.CLIENT_EVENTS_SUBSCRIBE_REQUEST,
request.SerializeToString())
response = ClientEventsSubscribeResponse()
response.ParseFromString(response_future.result().content)
# Forked all the way back to genesis, restart with no known_ids
if (response.status == ClientEventsSubscribeResponse.UNKNOWN_BLOCK
and known_ids):
self.start()
if response.status != ClientEventsSubscribeResponse.OK:
raise RuntimeError(
'Subscription failed with status: {}'.format(
ClientEventsSubscribeResponse.Status.Name(
response.status)))
self._is_active = True
LOGGER.debug('Successfully subscribed to state delta events')
while self._is_active:
message_future = self._stream.receive()
event_list = EventList()
event_list.ParseFromString(message_future.result().content)
for handler in self._event_handlers:
handler(event_list.events)
def stop(self):
"""Stops the Subscriber, unsubscribing from state delta events and
closing the the stream's connection.
"""
self._is_active = False
LOGGER.debug('Unsubscribing from state delta events')
request = ClientEventsUnsubscribeRequest()
response_future = self._stream.send(
Message.CLIENT_EVENTS_UNSUBSCRIBE_REQUEST,
request.SerializeToString())
response = ClientEventsUnsubscribeResponse()
response.ParseFromString(response_future.result().content)
if response.status != ClientEventsUnsubscribeResponse.OK:
LOGGER.warning(
'Failed to unsubscribe with status: %s',
ClientEventsUnsubscribeResponse.Status.Name(response.status))
self._stream.close()
