Onionr/src/gossip/server/__init__.py

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import asyncio
import traceback
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from typing import TYPE_CHECKING
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from typing import Set, List
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from queue import Queue
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from gossip import constants
from ..connectpeer import connect_peer
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from onionrplugins import onionrevents
import logger
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if TYPE_CHECKING:
from onionrblocks import Block
from peer import Peer
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from asyncio import StreamReader, StreamWriter
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from filepaths import gossip_server_socket_file
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from ..commands import GossipCommands
from .acceptstem import accept_stem_blocks
"""
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
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This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
"""
inbound_dandelion_edge_count = [0]
def gossip_server(
peer_set: Set['Peer'],
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block_queues: List[Queue['Block']],
dandelion_seed: bytes):
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async def peer_connected(
reader: 'StreamReader', writer: 'StreamWriter'):
while True:
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try:
cmd = await asyncio.wait_for(reader.read(1), 60)
except asyncio.exceptions.CancelledError:
break
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cmd = int.from_bytes(cmd, 'big')
if cmd == b'' or cmd == 0:
continue
match GossipCommands(cmd):
case GossipCommands.PING:
writer.write(b'PONG')
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case GossipCommands.CLOSE:
pass
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case GossipCommands.ANNOUNCE:
async def _read_announce():
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address = await reader.read(
constants.TRANSPORT_SIZE_BYTES)
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onionrevents.event(
'announce_rec',
data={'peer_set': peer_set,
'address': address,
'callback': connect_peer},
threaded=True)
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writer.write(int(1).to_bytes(1, 'big'))
await asyncio.wait_for(_read_announce(), 10)
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case GossipCommands.PEER_EXCHANGE:
for peer in peer_set:
writer.write(
peer.transport_address.encode(
'utf-8').removesuffix(b'.onion'))
case GossipCommands.PUT_BLOCKS:
# Create block queue & append stemmed blocks to it
try:
await accept_stem_blocks(
block_queues,
reader, writer,
inbound_dandelion_edge_count)
except Exception:
logger.warn(
f"Err getting\n{traceback.format_exc()}",
terminal=True)
# Subtract dandelion edge, make sure >=0
inbound_dandelion_edge_count[0] = \
max(inbound_dandelion_edge_count[0] - 1, 0)
break
await writer.drain()
writer.close()
async def main():
server = await asyncio.start_unix_server(
peer_connected, gossip_server_socket_file
)
async with server:
await server.serve_forever()
asyncio.run(main())