File size: 4,925 Bytes
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import { mkdir, open, readFile, unlink } from 'node:fs/promises';
import { dirname, join } from 'node:path';
export interface RemoteControlLockInfo {
readonly pid: number;
readonly nonce: string;
readonly localOrigin: string;
readonly deviceId: string;
readonly url: string;
readonly startedAt: number;
}
interface RemoteControlLockDisk {
readonly pid: number;
readonly nonce: string;
readonly local_origin: string;
readonly device_id: string;
readonly url: string;
readonly started_at: number;
}
export class RemoteControlAlreadyRunningError extends Error {
readonly holder: RemoteControlLockInfo;
constructor(holder: RemoteControlLockInfo) {
super(formatRemoteControlAlreadyRunning(holder));
this.name = 'RemoteControlAlreadyRunningError';
this.holder = holder;
}
}
export function formatRemoteControlAlreadyRunning(holder: RemoteControlLockInfo): string {
return [
`Remote Control is already running on this machine (pid ${holder.pid}, ${holder.localOrigin}, since ${new Date(holder.startedAt).toLocaleString()}).`,
`Use the existing link: ${holder.url}`,
'To start a new one here, stop the other `kimi web --remote-control` process first.',
].join('\n');
}
export function remoteControlLockPath(homeDir: string): string {
return join(homeDir, 'server', 'rc.json');
}
export interface RemoteControlLock {
release(): Promise<void>;
}
const MAX_ACQUIRE_ATTEMPTS = 3;
export async function acquireRemoteControlLock(
homeDir: string,
details: { localOrigin: string; deviceId: string; url: string },
): Promise<RemoteControlLock> {
const lockPath = remoteControlLockPath(homeDir);
await mkdir(dirname(lockPath), { recursive: true });
const info: RemoteControlLockInfo = {
pid: process.pid,
nonce: randomBytes(8).toString('hex'),
localOrigin: details.localOrigin,
deviceId: details.deviceId,
url: details.url,
startedAt: Date.now(),
};
for (let attempt = 0; ; attempt += 1) {
try {
const handle = await open(lockPath, 'wx');
try {
await handle.writeFile(encodeLock(info));
} finally {
await handle.close();
}
return { release: () => releaseRemoteControlLock(lockPath, info.nonce) };
} catch (error) {
if ((error as NodeJS.ErrnoException).code !== 'EEXIST' || attempt >= MAX_ACQUIRE_ATTEMPTS) {
throw error;
}
const holder = await readRemoteControlLock(lockPath);
if (holder !== undefined && pidAlive(holder.pid)) {
throw new RemoteControlAlreadyRunningError(holder);
}
await removeFile(lockPath);
}
}
}
export async function inspectRemoteControlLock(
homeDir: string,
): Promise<RemoteControlLockInfo | undefined> {
const lockPath = remoteControlLockPath(homeDir);
const info = await readRemoteControlLock(lockPath);
if (info === undefined) return undefined;
if (!pidAlive(info.pid)) {
await removeFile(lockPath);
return undefined;
}
return info;
}
async function releaseRemoteControlLock(lockPath: string, nonce: string): Promise<void> {
const info = await readRemoteControlLock(lockPath);
if (info === undefined || info.nonce !== nonce) return;
await removeFile(lockPath);
}
async function readRemoteControlLock(lockPath: string): Promise<RemoteControlLockInfo | undefined> {
let raw: string;
try {
raw = await readFile(lockPath, 'utf8');
} catch {
return undefined;
}
return decodeLock(raw);
}
function encodeLock(info: RemoteControlLockInfo): string {
const disk: RemoteControlLockDisk = {
pid: info.pid,
nonce: info.nonce,
local_origin: info.localOrigin,
device_id: info.deviceId,
url: info.url,
started_at: info.startedAt,
};
return JSON.stringify(disk);
}
function decodeLock(raw: string): RemoteControlLockInfo | undefined {
try {
const parsed = JSON.parse(raw) as Partial<RemoteControlLockDisk>;
if (
typeof parsed.pid === 'number' &&
typeof parsed.nonce === 'string' &&
typeof parsed.local_origin === 'string' &&
typeof parsed.device_id === 'string' &&
typeof parsed.url === 'string' &&
typeof parsed.started_at === 'number'
) {
return {
pid: parsed.pid,
nonce: parsed.nonce,
localOrigin: parsed.local_origin,
deviceId: parsed.device_id,
url: parsed.url,
startedAt: parsed.started_at,
};
}
return undefined;
} catch {
return undefined;
}
}
async function removeFile(lockPath: string): Promise<void> {
try {
await unlink(lockPath);
} catch (error) {
if ((error as NodeJS.ErrnoException).code !== 'ENOENT') throw error;
}
}
function pidAlive(pid: number): boolean {
try {
process.kill(pid, 0);
return true;
} catch (error) {
if ((error as NodeJS.ErrnoException).code === 'ESRCH') return false;
return true;
}
}
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