9c6d441f9f
* Add notifee interface * Add notify function to network interface * Implement notify feature * Add tests for notify * Make notifee functions all async * Fix linting issue * Fix linting issue * Scaffold pubsub router interface * Scaffold pubsub directory * Store peer_id in muxed connection * Implement pubsub notifee * Remove outdated files * Implement pubsub first attempt * Prepare pubsub for floodsub * Add mplex conn to net stream and add conn in notify tests * Implement floodsub * Use NetStream in generic protocol handler * Debugging async issues * Modify test to perform proper assert. Test passes * Remove callbacks. Reduce sleep time * Add simple three node test * Clean up code. Add message classes * Add test for two topics * Add conn to net stream and conn tests * Refactor test setup to remove duplicate code * Fix linting issues * Fix linting issue * Fix linting issue * Fix outstanding unrelated lint issue in multiselect_client * Add connect function * Remove debug prints * Remove debug prints from floodsub * Use MessageTalk in place of direct message breakdown * Remove extra prints * Remove outdated function * Add message to queues for all topics in message * Debugging * Add message self delivery * Increase read timeout to 5 to get pubsub tests passing * Refactor testing helper func. Add tests * Add tests and increase timeout to get tests passing * Add dummy account demo scaffolding * Attempt to use threads. Test fails * Implement basic dummy node tests using threads * Add generic testing function * Add simple seven node tree test * Add more complex seven node tree tests * Add five node ring tests * Remove unnecessary get_message_type func * Add documentation to classes * Add message id to messages * Add documentation to test helper func * Add docs to dummy account node helper func * Add more docs to dummy account node test helper func * fixed linting errors in floodsub * small notify bugfix * move pubsub into libp2p * fixed pubsub linting * fixing pubsub test failures * linting
295 lines
10 KiB
Python
295 lines
10 KiB
Python
import asyncio
|
|
|
|
from .pubsub_notifee import PubsubNotifee
|
|
from .message import MessageSub
|
|
from .message import create_message_talk, create_message_sub
|
|
from. message import generate_message_id
|
|
|
|
|
|
class Pubsub():
|
|
"""
|
|
For now, because I'm on a plane and don't have access to the go repo/protobuf stuff,
|
|
this is going to be the message format for the two types: subscription and talk
|
|
subscription indicates subscribing or unsubscribing from a topic
|
|
talk is sending a message on topic(s)
|
|
subscription format:
|
|
subscription
|
|
'from'
|
|
<one of 'sub', 'unsub'>:'topicid'
|
|
<one of 'sub', 'unsub'>:'topicid'
|
|
...
|
|
Ex.
|
|
subscription
|
|
msg_sender_peer_id
|
|
origin_peer_id
|
|
sub:topic1
|
|
sub:topic2
|
|
unsub:fav_topic
|
|
talk format:
|
|
talk
|
|
'from'
|
|
'origin'
|
|
[topic_ids comma-delimited]
|
|
'data'
|
|
Ex.
|
|
talk
|
|
msg_sender_peer_id
|
|
origin_peer_id
|
|
topic1,topics_are_cool,foo
|
|
I like tacos
|
|
"""
|
|
# pylint: disable=too-many-instance-attributes
|
|
|
|
def __init__(self, host, router, my_id):
|
|
"""
|
|
Construct a new Pubsub object, which is responsible for handling all
|
|
Pubsub-related messages and relaying messages as appropriate to the
|
|
Pubsub router (which is responsible for choosing who to send messages to).
|
|
Since the logic for choosing peers to send pubsub messages to is
|
|
in the router, the same Pubsub impl can back floodsub, gossipsub, etc.
|
|
"""
|
|
self.host = host
|
|
self.router = router
|
|
self.my_id = my_id
|
|
|
|
# Attach this new Pubsub object to the router
|
|
self.router.attach(self)
|
|
|
|
# Register a notifee
|
|
self.peer_queue = asyncio.Queue()
|
|
self.host.get_network().notify(PubsubNotifee(self.peer_queue))
|
|
|
|
# Register stream handlers for each pubsub router protocol to handle
|
|
# the pubsub streams opened on those protocols
|
|
self.protocols = self.router.get_protocols()
|
|
for protocol in self.protocols:
|
|
self.host.set_stream_handler(protocol, self.stream_handler)
|
|
|
|
# TODO: determine if these need to be asyncio queues, or if could possibly
|
|
# be ordinary blocking queues
|
|
self.incoming_msgs_from_peers = asyncio.Queue()
|
|
self.outgoing_messages = asyncio.Queue()
|
|
|
|
# TODO: Make seen_messages a cache (LRU cache?)
|
|
self.seen_messages = []
|
|
|
|
# Map of topics we are subscribed to to handler functions
|
|
# for when the given topic receives a message
|
|
self.my_topics = {}
|
|
|
|
# Map of topic to peers to keep track of what peers are subscribed to
|
|
self.peer_topics = {}
|
|
|
|
# Create peers map, which maps peer_id (as string) to stream (to a given peer)
|
|
self.peers = {}
|
|
|
|
# Call handle peer to keep waiting for updates to peer queue
|
|
asyncio.ensure_future(self.handle_peer_queue())
|
|
|
|
def get_hello_packet(self):
|
|
"""
|
|
Generate subscription message with all topics we are subscribed to
|
|
"""
|
|
subs_map = {}
|
|
for topic in self.my_topics:
|
|
subs_map[topic] = True
|
|
sub_msg = MessageSub(
|
|
str(self.host.get_id()),\
|
|
str(self.host.get_id()), subs_map, generate_message_id()\
|
|
)
|
|
return sub_msg.to_str()
|
|
|
|
async def continously_read_stream(self, stream):
|
|
"""
|
|
Read from input stream in an infinite loop. Process
|
|
messages from other nodes, which for now are considered MessageTalk
|
|
and MessageSub messages.
|
|
TODO: Handle RPC messages instead of my Aspyn's own custom message format
|
|
:param stream: stream to continously read from
|
|
"""
|
|
while True:
|
|
incoming = (await stream.read()).decode()
|
|
msg_comps = incoming.split('\n')
|
|
msg_type = msg_comps[0]
|
|
|
|
msg_sender = msg_comps[1]
|
|
# msg_origin = msg_comps[2]
|
|
msg_id = msg_comps[3]
|
|
print("HIT ME1")
|
|
if msg_id not in self.seen_messages:
|
|
print("HIT ME")
|
|
# Do stuff with incoming unseen message
|
|
should_publish = True
|
|
if msg_type == "subscription":
|
|
self.handle_subscription(incoming)
|
|
|
|
# We don't need to relay the subscription to our
|
|
# peers because a given node only needs its peers
|
|
# to know that it is subscribed to the topic (doesn't
|
|
# need everyone to know)
|
|
should_publish = False
|
|
elif msg_type == "talk":
|
|
await self.handle_talk(incoming)
|
|
|
|
# Add message id to seen
|
|
self.seen_messages.append(msg_id)
|
|
|
|
# Publish message using router's publish
|
|
if should_publish:
|
|
msg = create_message_talk(incoming)
|
|
|
|
# Adjust raw_msg to that the message sender
|
|
# is now our peer_id
|
|
msg.from_id = str(self.host.get_id())
|
|
|
|
await self.router.publish(msg_sender, msg.to_str())
|
|
|
|
# Force context switch
|
|
await asyncio.sleep(0)
|
|
|
|
async def stream_handler(self, stream):
|
|
"""
|
|
Stream handler for pubsub. Gets invoked whenever a new stream is created
|
|
on one of the supported pubsub protocols.
|
|
:param stream: newly created stream
|
|
"""
|
|
# Add peer
|
|
# Map peer to stream
|
|
peer_id = stream.mplex_conn.peer_id
|
|
self.peers[str(peer_id)] = stream
|
|
self.router.add_peer(peer_id, stream.get_protocol())
|
|
|
|
# Send hello packet
|
|
hello = self.get_hello_packet()
|
|
await stream.write(hello.encode())
|
|
# Pass stream off to stream reader
|
|
asyncio.ensure_future(self.continously_read_stream(stream))
|
|
|
|
async def handle_peer_queue(self):
|
|
"""
|
|
Continuously read from peer queue and each time a new peer is found,
|
|
open a stream to the peer using a supported pubsub protocol
|
|
TODO: Handle failure for when the peer does not support any of the
|
|
pubsub protocols we support
|
|
"""
|
|
while True:
|
|
peer_id = await self.peer_queue.get()
|
|
|
|
# Open a stream to peer on existing connection
|
|
# (we know connection exists since that's the only way
|
|
# an element gets added to peer_queue)
|
|
stream = await self.host.new_stream(peer_id, self.protocols)
|
|
|
|
# Add Peer
|
|
# Map peer to stream
|
|
self.peers[str(peer_id)] = stream
|
|
self.router.add_peer(peer_id, stream.get_protocol())
|
|
|
|
# Send hello packet
|
|
hello = self.get_hello_packet()
|
|
await stream.write(hello.encode())
|
|
|
|
# Pass stream off to stream reader
|
|
asyncio.ensure_future(self.continously_read_stream(stream))
|
|
|
|
# Force context switch
|
|
await asyncio.sleep(0)
|
|
|
|
def handle_subscription(self, subscription):
|
|
"""
|
|
Handle an incoming subscription message from a peer. Update internal
|
|
mapping to mark the peer as subscribed or unsubscribed to topics as
|
|
defined in the subscription message
|
|
:param subscription: raw data constituting a subscription message
|
|
"""
|
|
sub_msg = create_message_sub(subscription)
|
|
if sub_msg.subs_map:
|
|
print("handle_subscription my_id: " + self.my_id + ", subber: " + sub_msg.origin_id)
|
|
for topic_id in sub_msg.subs_map:
|
|
# Look at each subscription in the msg individually
|
|
if sub_msg.subs_map[topic_id]:
|
|
if topic_id not in self.peer_topics:
|
|
# Create topic list if it did not yet exist
|
|
self.peer_topics[topic_id] = [sub_msg.origin_id]
|
|
elif sub_msg.origin_id not in self.peer_topics[topic_id]:
|
|
# Add peer to topic
|
|
self.peer_topics[topic_id].append(sub_msg.origin_id)
|
|
else:
|
|
# TODO: Remove peer from topic
|
|
pass
|
|
|
|
async def handle_talk(self, talk):
|
|
"""
|
|
Handle incoming Talk message from a peer. A Talk message contains some
|
|
custom message that is published on a given topic(s)
|
|
:param talk: raw data constituting a talk message
|
|
"""
|
|
msg = create_message_talk(talk)
|
|
|
|
# Check if this message has any topics that we are subscribed to
|
|
for topic in msg.topics:
|
|
if topic in self.my_topics:
|
|
# we are subscribed to a topic this message was sent for,
|
|
# so add message to the subscription output queue
|
|
# for each topic
|
|
await self.my_topics[topic].put(talk)
|
|
|
|
async def subscribe(self, topic_id):
|
|
"""
|
|
Subscribe ourself to a topic
|
|
:param topic_id: topic_id to subscribe to
|
|
"""
|
|
# Map topic_id to blocking queue
|
|
self.my_topics[topic_id] = asyncio.Queue()
|
|
|
|
# Create subscribe message
|
|
sub_msg = MessageSub(
|
|
str(self.host.get_id()),\
|
|
str(self.host.get_id()), {topic_id: True}, generate_message_id()\
|
|
)
|
|
|
|
# Send out subscribe message to all peers
|
|
await self.message_all_peers(sub_msg.to_str())
|
|
|
|
# Tell router we are joining this topic
|
|
self.router.join(topic_id)
|
|
|
|
# Return the asyncio queue for messages on this topic
|
|
return self.my_topics[topic_id]
|
|
|
|
async def unsubscribe(self, topic_id):
|
|
"""
|
|
Unsubscribe ourself from a topic
|
|
:param topic_id: topic_id to unsubscribe from
|
|
"""
|
|
|
|
# Remove topic_id from map if present
|
|
if topic_id in self.my_topics:
|
|
del self.my_topics[topic_id]
|
|
|
|
# Create unsubscribe message
|
|
unsub_msg = MessageSub(str(self.host.get_id()), str(self.host.get_id()),\
|
|
{topic_id: False}, generate_message_id())
|
|
|
|
# Send out unsubscribe message to all peers
|
|
await self.message_all_peers(unsub_msg.to_str())
|
|
|
|
# Tell router we are leaving this topic
|
|
self.router.leave(topic_id)
|
|
|
|
async def message_all_peers(self, raw_msg):
|
|
"""
|
|
Broadcast a message to peers
|
|
:param raw_msg: raw contents of the message to broadcast
|
|
"""
|
|
|
|
# Encode message for sending
|
|
encoded_msg = raw_msg.encode()
|
|
|
|
# Broadcast message
|
|
for peer in self.peers:
|
|
stream = self.peers[peer]
|
|
|
|
# Write message to stream
|
|
await stream.write(encoded_msg)
|