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import { createServer, type Server, type Socket } from "node:net";
import { createInterface, type Interface } from "node:readline";
import { unlinkSync } from "node:fs";
import {
type WireMessage,
type WireControl,
isWireMessage,
DAEMON_SOCKET_PATH,
DAEMON_MAX_CLIENTS,
} from "./protocol";
export type ClientSocket = {
id: string;
readonly socket: Socket;
readonly rl: Interface;
registered: boolean;
};
export type MessageHandler = (msg: WireMessage, client: ClientSocket) => void;
export type ConnectionHandler = (client: ClientSocket) => void;
export type IpcServer = {
start(): Promise<void>;
stop(): Promise<void>;
onMessage(handler: MessageHandler): void;
onConnect(handler: ConnectionHandler): void;
onDisconnect(handler: ConnectionHandler): void;
send(clientId: string, msg: WireMessage): void;
broadcast(msg: WireMessage): void;
clientCount(): number;
};
export const createIpcServer = (): IpcServer => {
let server: Server | null = null;
const sockets = new Map<string, ClientSocket>();
const clients = new Map<string, ClientSocket>();
let messageHandler: MessageHandler | null = null;
let connectHandler: ConnectionHandler | null = null;
let disconnectHandler: ConnectionHandler | null = null;
let nextTempId = 1;
const start = (): Promise<void> =>
new Promise((resolve, reject) => {
try {
unlinkSync(DAEMON_SOCKET_PATH);
} catch {}
server = createServer({ pauseOnConnect: false }, (socket: Socket) => {
if (clients.size >= DAEMON_MAX_CLIENTS) {
socket.destroy();
return;
}
const tempId = `anon-${nextTempId++}`;
const rl = createInterface({ input: socket, crlfDelay: Infinity });
let currentClient: ClientSocket = { id: tempId, socket, rl, registered: false };
sockets.set(tempId, currentClient);
rl.on("line", (line: string) => {
let msg: WireMessage | null;
try {
const parsed: unknown = JSON.parse(line);
if (!isWireMessage(parsed)) return;
msg = parsed;
} catch {
return;
}
if (msg.type === "control" && msg.action === "register" && !currentClient.registered) {
const clientId = msg.clientId;
if (!clientId) return;
if (clients.has(clientId)) {
const reply: WireControl = {
type: "control",
action: "shutdown",
reason: `clientId ${clientId} is already connected`,
};
socket.write(JSON.stringify(reply) + "\n");
socket.destroy();
return;
}
// Mutate in place so the already-captured closure sees the promoted client.
sockets.delete(tempId);
currentClient.id = clientId;
currentClient.registered = true;
clients.set(clientId, currentClient);
const ack: WireControl = { type: "control", action: "registered", clientId };
socket.write(JSON.stringify(ack) + "\n");
connectHandler?.(currentClient);
return;
}
if (!currentClient.registered) return;
messageHandler?.(msg, currentClient);
});
socket.on("error", () => {});
socket.on("close", () => {
const found = clients.get(currentClient.id) ?? sockets.get(tempId);
if (found) {
clients.delete(found.id);
sockets.delete(tempId);
if (found.registered) {
disconnectHandler?.(found);
}
}
rl.close();
});
});
server.on("error", (err: NodeJS.ErrnoException) => {
reject(err);
});
server.listen(DAEMON_SOCKET_PATH, () => {
resolve();
});
});
const stop = (): Promise<void> =>
new Promise((resolve) => {
for (const [, client] of clients) {
try { client.socket.destroy(); } catch {}
}
for (const [, client] of sockets) {
try { client.socket.destroy(); } catch {}
}
clients.clear();
sockets.clear();
if (server) {
server.close(() => {
try { unlinkSync(DAEMON_SOCKET_PATH); } catch {}
resolve();
});
} else {
resolve();
}
});
return {
start,
stop,
onMessage(handler) {
messageHandler = handler;
},
onConnect(handler) {
connectHandler = handler;
},
onDisconnect(handler) {
disconnectHandler = handler;
},
send(clientId, msg) {
const client = clients.get(clientId);
if (!client) return;
try {
client.socket.write(JSON.stringify(msg) + "\n");
} catch {}
},
broadcast(msg) {
for (const [clientId] of clients) {
this.send(clientId, msg);
}
},
clientCount: (): number => clients.size,
};
};
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