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import { createConnection, type Socket } from "node:net";
import { createInterface } from "node:readline";
import { type Result, err, ok } from "../util/result";
import { type CdpError, cdpError } from "../cdp/errors";
import type { CdpTransport } from "../cdp/transport";
import type { CdpEvent } from "../cdp/types";
import { type Pending, makeEventQueue, makeOnClose, rejectAllPending, sendWithTimeout } from "./event-queue";
import {
DAEMON_SOCKET_PATH,
type WireRequest,
type WireControl,
deserialize,
serialize,
} from "../daemon/protocol";
export const createDaemonTransport = (clientId: string): CdpTransport => {
let socket: Socket | null = null;
let rl: ReturnType<typeof createInterface> | null = null;
let queue = makeEventQueue();
const closeListeners = new Set<() => void>();
const pending = new Map<number, Pending>();
let registered = false;
let nextRequestId = 1;
const cleanup = (reason: string): void => {
rejectAllPending(pending, reason);
queue.end();
queue = makeEventQueue();
registered = false;
if (rl) { rl.close(); rl = null; }
if (socket) { try { socket.destroy(); } catch {} socket = null; }
for (const cb of closeListeners) cb();
};
const connect = (_url: string, opts?: { timeoutMs?: number }): Promise<Result<void, CdpError>> => {
const timeoutMs = opts?.timeoutMs ?? 10_000;
if (socket && !socket.destroyed && registered) {
return Promise.resolve(ok(undefined));
}
return new Promise((resolve) => {
let settled = false;
const settle = (r: Result<void, CdpError>): void => {
if (settled) return;
settled = true;
resolve(r);
};
let sock: Socket;
try {
sock = createConnection(DAEMON_SOCKET_PATH);
} catch (e) {
settle(err(cdpError("transport_closed", e instanceof Error ? e.message : String(e))));
return;
}
socket = sock;
const connectTimer = setTimeout(() => {
cleanup("Connection timeout");
settle(err(cdpError("timeout", `Daemon connection timed out after ${timeoutMs}ms`)));
}, timeoutMs);
sock.on("connect", () => {
clearTimeout(connectTimer);
rl = createInterface({ input: sock, crlfDelay: Infinity });
rl.on("line", (line: string) => {
const msg = deserialize(line);
if (!msg) return;
if (msg.type === "control" && msg.action === "registered" && msg.clientId === clientId) {
registered = true;
settle(ok(undefined));
return;
}
if (msg.type === "control" && msg.action === "shutdown") {
cleanup(`Daemon shutting down: ${msg.reason ?? "unknown"}`);
return;
}
if (!registered) return;
if (msg.type === "response") {
const p = pending.get(msg.id);
if (!p) return;
pending.delete(msg.id);
clearTimeout(p.timer);
if (msg.error) {
p.resolve(err(cdpError(
msg.error.message.includes("Session with given id not found")
? "session_not_found"
: "remote_error",
msg.error.message,
p.method,
)));
} else {
p.resolve(ok(msg.result));
}
return;
}
if (msg.type === "event") {
queue.push({
method: msg.method,
params: msg.params,
...(msg.sessionId !== undefined ? { sessionId: msg.sessionId } : {}),
});
return;
}
});
sock.on("error", () => {});
sock.on("close", () => {
clearTimeout(connectTimer);
cleanup("Daemon socket closed");
settle(err(cdpError("transport_closed", "Daemon socket closed before registration")));
});
const regMsg: WireControl = { type: "control", action: "register", clientId };
sock.write(serialize(regMsg) + "\n");
});
sock.on("error", (e: NodeJS.ErrnoException) => {
clearTimeout(connectTimer);
const msg = e.code === "ENOENT"
? "Daemon not running — socket not found"
: e.message;
settle(err(cdpError("transport_closed", msg)));
});
});
};
const close = async (): Promise<void> => {
if (registered && socket && !socket.destroyed) {
const dereg: WireControl = { type: "control", action: "deregister", clientId };
try { socket.write(serialize(dereg) + "\n"); } catch {}
}
cleanup("close() called");
};
const request = (
method: string,
params: Record<string, unknown>,
opts?: { sessionId?: string | null; timeoutMs?: number },
): Promise<Result<unknown, CdpError>> => {
const timeoutMs = opts?.timeoutMs ?? 15_000;
const sessionId = opts?.sessionId ?? null;
const sock = socket;
if (sock === null || sock.destroyed || !registered) {
return Promise.resolve(err(cdpError("transport_closed", "Daemon not connected", method)));
}
const id = nextRequestId++;
const req: WireRequest = {
type: "request",
id,
method,
params,
...(sessionId !== null && sessionId !== undefined ? { sessionId } : {}),
};
return sendWithTimeout(pending, id, method, timeoutMs, "Daemon", () => sock.write(serialize(req) + "\n"));
};
const events = (): AsyncIterable<CdpEvent> => queue.iter;
const state = (): "open" | "closed" | "connecting" => {
if (!socket) return "closed";
if (!registered) return "connecting";
if (socket.destroyed) return "closed";
return "open";
};
const onClose = makeOnClose(closeListeners);
return { connect, close, request, events, state, onClose };
};
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