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ipc-unix/ipc_unix/pubsub.py

76 lines
2.1 KiB
Python

import select
import socket
import ujson
from ipc_unix.utils import DEFAULT_SOCKET_READ_TIMEOUT, read_payload, socket_has_data
class Subscriber:
def __init__(self, socket_path):
self.socket_path = socket_path
self.socket = socket.socket(socket.AF_UNIX, type=socket.SOCK_STREAM)
self.socket.connect(self.socket_path)
@property
def has_data(self):
return socket_has_data(self.socket)
def listen(self):
while True:
yield from self.get_message()
def get_messages(self) -> dict:
return read_payload(self.socket)
def flush_data(self):
while self.has_data:
yield from self.get_messages()
def get_latest_message(self):
data = list(self.flush_data())
return data[-1] if data else None
def close(self):
self.socket.close()
class Publisher:
def __init__(self, socket_path):
self.socket_path = socket_path
self.master_socket = socket.socket(socket.AF_UNIX, type=socket.SOCK_STREAM)
self.master_socket.bind(self.socket_path)
self.master_socket.listen(1)
self.connections = []
def close(self):
self.master_socket.close()
for connection in self.connections:
connection.close()
self.connections.clear()
def accept_new_connection(self):
while socket_has_data(self.master_socket):
new_socket, _ = self.master_socket.accept()
self.connections.append(new_socket)
def write(self, message: dict):
self.accept_new_connection()
_, writable, errorable = select.select(
[], self.connections, [], DEFAULT_SOCKET_READ_TIMEOUT
)
dead_sockets = []
if writable:
data = ujson.dumps(message).encode() + b"\n"
for sock in writable:
try:
sock.send(data)
except BrokenPipeError:
dead_sockets.append(sock)
for sock in dead_sockets:
if sock in self.connections:
self.connections.remove(sock)
sock.close()