jensandClaude Sonnet 4.6
3ab7795248
The server keeps the most recent snapshot in memory (under the same lock as the client list). When a client connects it receives that snapshot right away, then continues to receive live updates on each collection cycle. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
import json
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import logging
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import socket
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import threading
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log = logging.getLogger(__name__)
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def _accept_loop(
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server_sock: socket.socket,
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clients: list,
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lock: threading.Lock,
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last_snapshot: dict,
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) -> None:
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while True:
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try:
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conn, addr = server_sock.accept()
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log.info("Push client connected from %s", addr)
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with lock:
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if last_snapshot["data"] is not None:
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try:
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line = (json.dumps(last_snapshot["data"], default=str) + "\n").encode()
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conn.sendall(line)
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except OSError:
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log.debug("Failed to send initial snapshot to %s", addr)
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conn.close()
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continue
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clients.append(conn)
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except OSError:
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break
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def broadcast(snapshot: dict, clients: list, lock: threading.Lock, last_snapshot: dict) -> None:
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line = (json.dumps(snapshot, default=str) + "\n").encode()
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with lock:
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last_snapshot["data"] = snapshot
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dead = []
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for conn in clients:
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try:
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conn.sendall(line)
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except OSError:
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dead.append(conn)
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for conn in dead:
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clients.remove(conn)
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conn.close()
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log.info("Push client disconnected")
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def start_push_server(host: str, port: int) -> tuple:
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server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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server_sock.bind((host, port))
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server_sock.listen()
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clients: list = []
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lock = threading.Lock()
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last_snapshot: dict = {"data": None}
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t = threading.Thread(
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target=_accept_loop,
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args=(server_sock, clients, lock, last_snapshot),
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daemon=True,
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)
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t.start()
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log.info("Push server listening on %s:%d", host, port)
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return clients, lock, last_snapshot |