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import type { ServerState } from "./types";
import { SERVER_STATE } from "./types";
import { node } from "./binary-manager";
const HEALTH_POLL_INTERVAL_MS = 1000;
const HEALTH_POLL_MAX_ATTEMPTS = 120;
const STOP_GRACE_MS = 5000;
const CRASH_RESTART_DELAY_MS = 3000;
const MAX_CRASH_RESTARTS = 3;
const PORT_FILE_POLL_INTERVAL_MS = 500;
const PORT_FILE_MAX_ATTEMPTS = 240;
export interface ServerManagerOptions {
binaryPath: string;
dataDir: string;
port: number | null;
ollamaUrl: string;
systemPrompt: string;
onStateChange?: (state: ServerState) => void;
onRestartsExhausted?: (stderr: string) => void;
}
export class ServerManager {
private opts: ServerManagerOptions;
private child: ChildProcess | null = null;
private _state: ServerState = SERVER_STATE.STOPPED;
private crashCount = 0;
private stopping = false;
private restartTimer: ReturnType<typeof setTimeout> | null = null;
private _actualPort: number | null = null;
private _stderrLines: string[] = [];
private static readonly MAX_STDERR_LINES = 20;
constructor(opts: ServerManagerOptions) {
this.opts = opts;
}
get lastStderr(): string {
return this._stderrLines.join("\n");
}
get state(): ServerState {
return this._state;
}
get serverUrl(): string {
const port = this._actualPort ?? this.opts.port;
return `http://127.0.0.1:${port}`;
}
private get portFilePath(): string {
return `${this.opts.dataDir}/data/server.port`;
}
private async waitForPortFile(): Promise<void> {
for (let i = 0; i < PORT_FILE_MAX_ATTEMPTS; i++) {
if (node.existsSync(this.portFilePath)) {
const content = node.readFileSync(this.portFilePath, "utf-8").trim();
const port = parseInt(content, 10);
if (!isNaN(port) && port > 0 && port <= 65535) {
this._actualPort = port;
return;
}
}
await new Promise((r) => setTimeout(r, PORT_FILE_POLL_INTERVAL_MS));
}
throw new Error("Port file not found within timeout");
}
private setState(s: ServerState): void {
this._state = s;
this.opts.onStateChange?.(s);
}
async start(): Promise<void> {
if (this.child) return;
this.stopping = false;
this._actualPort = null;
this.setState(SERVER_STATE.STARTING);
const args = [
"serve",
"--host", "127.0.0.1",
];
if (this.opts.port !== null) {
args.push("--port", String(this.opts.port));
}
args.push("--data-dir", this.opts.dataDir);
const env: Record<string, string | undefined> = {
...process.env,
OLLAMA_HOST: this.opts.ollamaUrl,
LILBEE_CORS_ORIGINS: "app://obsidian.md",
};
if (this.opts.systemPrompt) {
env.LILBEE_SYSTEM_PROMPT = this.opts.systemPrompt;
}
this._stderrLines = [];
this.child = node.spawn(this.opts.binaryPath, args, {
env,
stdio: ["ignore", "ignore", "pipe"],
detached: false,
});
if (this.child.stderr) {
let partial = "";
this.child.stderr.on("data", (chunk: Buffer) => {
partial += chunk.toString();
const lines = partial.split("\n");
partial = lines.pop()!;
for (const line of lines) {
if (line.length > 0) {
this._stderrLines.push(line);
if (this._stderrLines.length > ServerManager.MAX_STDERR_LINES) {
this._stderrLines.shift();
}
}
}
});
}
this.child.on("exit", (_code, _signal) => {
this.child = null;
if (!this.stopping && this.crashCount < MAX_CRASH_RESTARTS) {
this.crashCount++;
this.setState(SERVER_STATE.ERROR);
this.restartTimer = setTimeout(() => {
this.restartTimer = null;
if (!this.stopping) void this.start();
}, CRASH_RESTART_DELAY_MS);
} else if (!this.stopping) {
this.setState(SERVER_STATE.ERROR);
this.opts.onRestartsExhausted?.(this.lastStderr);
}
});
this.child.on("error", () => {
this.child = null;
this.setState(SERVER_STATE.ERROR);
});
try {
if (this.opts.port === null) {
await this.waitForPortFile();
} else {
this._actualPort = this.opts.port;
}
await this.waitForReady();
this.crashCount = 0;
this.setState(SERVER_STATE.READY);
} catch {
this.setState(SERVER_STATE.ERROR);
}
}
private async waitForReady(): Promise<void> {
for (let i = 0; i < HEALTH_POLL_MAX_ATTEMPTS; i++) {
try {
const res = await node.fetch(`${this.serverUrl}/api/health`);
if (res.ok) return;
} catch {
// not ready yet
}
await new Promise((r) => setTimeout(r, HEALTH_POLL_INTERVAL_MS));
}
throw new Error("Server did not become ready within timeout");
}
async stop(): Promise<void> {
this.stopping = true;
if (this.restartTimer) {
clearTimeout(this.restartTimer);
this.restartTimer = null;
}
if (!this.child) {
this.setState(SERVER_STATE.STOPPED);
return;
}
const child = this.child;
if (process.platform === "win32") {
try {
await node.execFile("taskkill", ["/pid", String(child.pid), "/f", "/t"]);
} catch {
// process may already be gone
}
} else {
child.kill("SIGTERM");
}
const exited = await Promise.race([
new Promise<boolean>((resolve) => {
child.on("exit", () => resolve(true));
}),
new Promise<boolean>((resolve) => {
setTimeout(() => resolve(false), STOP_GRACE_MS);
}),
]);
if (!exited && this.child) {
this.child.kill("SIGKILL");
}
this.child = null;
this.setState(SERVER_STATE.STOPPED);
if (node.existsSync(this.portFilePath)) {
try {
node.unlinkSync(this.portFilePath);
} catch {
// ignore cleanup errors
}
}
}
async restart(): Promise<void> {
await this.stop();
this.crashCount = 0;
await this.start();
}
updateOllamaUrl(url: string): void {
this.opts.ollamaUrl = url;
}
updatePort(port: number | null): void {
this.opts.port = port;
if (port !== null) {
this._actualPort = port;
}
}
}
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