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import { app } from 'electron';
import * as path from 'path';
import * as fs from 'fs';
export interface PrerequisiteResult {
ok: boolean;
error?: string;
needsInstall?: boolean;
}
// Check if this is a nightly build (version contains 'nightly' or commit hash)
function isNightlyBuild(): boolean {
const version = app.getVersion();
return version.includes('nightly') || version.includes('-') || !version.match(/^\d+\.\d+\.\d+$/);
}
export class ServerManager {
private process: ChildProcess | null = null;
private stopping = false;
private stopped = false;
private stopPromise: Promise<void> | null = null;
/**
* Clean up all listeners from the child process and reset state.
*/
private cleanup(): void {
Eif (this.process) {
this.process.stdout?.removeAllListeners();
this.process.stderr?.removeAllListeners();
this.process.removeAllListeners();
this.process = null;
}
}
/**
* Get the path to the bundled mehr binary (macOS/Linux only).
*/
private getMehrPath(): string {
Iif (app.isPackaged) {
// In packaged app: resources/bin/mehr
return path.join(process.resourcesPath, 'bin', 'mehr');
} else {
// In dev: look in desktop/resources/bin/ or fall back to PATH
const devPath = path.join(__dirname, '../../resources/bin', 'mehr');
if (fs.existsSync(devPath)) {
return devPath;
}
return 'mehr'; // Fall back to PATH for dev
}
}
/**
* Preflight check - call on app startup.
* - macOS/Linux: Check bundled binary exists
* - Windows: Check WSL exists, auto-install mehr if missing
*/
checkPrerequisites(): PrerequisiteResult {
const isWindows = process.platform === 'win32';
if (isWindows) {
return this.checkWindowsPrerequisites();
} else {
return this.checkUnixPrerequisites();
}
}
private checkUnixPrerequisites(): PrerequisiteResult {
const mehrPath = this.getMehrPath();
// In dev mode with fallback to PATH, check if mehr exists
if (mehrPath === 'mehr') {
const check = spawnSync('which', ['mehr'], { stdio: 'pipe' });
if (check.status !== 0) {
return {
ok: false,
error: 'mehr binary not found.\n\nThis is a development build issue.',
};
}
I} else if (!fs.existsSync(mehrPath)) {
return {
ok: false,
error: 'Bundled mehr binary not found.\n\nPlease reinstall the application.',
};
}
return { ok: true };
}
private checkWindowsPrerequisites(): PrerequisiteResult {
// Check WSL availability
const wslCheck = spawnSync('wsl', ['--version'], { stdio: 'pipe' });
if (wslCheck.status !== 0) {
return {
ok: false,
error: 'WSL is not installed.\n\nPlease install WSL2:\nhttps://learn.microsoft.com/en-us/windows/wsl/install',
};
}
// Check if mehr is installed in WSL
const mehrCheck = spawnSync('wsl', ['which', 'mehr'], { stdio: 'pipe' });
if (mehrCheck.status !== 0) {
// mehr not found - needs auto-install
return { ok: true, needsInstall: true };
}
return { ok: true };
}
/**
* Auto-install mehr in WSL (Windows only).
* Uses the install script with --nightly flag if this is a nightly build.
*/
async installMehrInWSL(): Promise<void> {
const nightlyFlag = isNightlyBuild() ? ' -s -- --nightly' : '';
const installCmd = `curl -fsSL https://raw.githubusercontent.com/valksor/go-mehrhof/master/install.sh | bash${nightlyFlag}`;
return new Promise((resolve, reject) => {
const proc = spawn('wsl', ['bash', '-c', installCmd], {
stdio: ['ignore', 'pipe', 'pipe'],
});
let stderr = '';
proc.stderr?.on('data', (data: Buffer) => {
stderr += data.toString();
});
proc.on('exit', (code) => {
if (code === 0) {
resolve();
} else {
reject(new Error(`Failed to install mehr in WSL:\n${stderr}`));
}
});
proc.on('error', (err) => {
reject(new Error(`Failed to run install script: ${err.message}`));
});
});
}
/**
* Start mehr serve in global mode.
* Shows project picker UI.
* @returns The port number mehr is listening on.
*/
async startGlobal(): Promise<number> {
// Stop any existing process first
await this.stop();
this.stopped = false; // Reset for new server instance
const isWindows = process.platform === 'win32';
let cmd: string;
let args: string[];
if (isWindows) {
cmd = 'wsl';
args = ['mehr', 'serve', '--global', '--port', '0'];
} else {
cmd = this.getMehrPath();
args = ['serve', '--global', '--port', '0'];
}
return new Promise((resolve, reject) => {
this.process = spawn(cmd, args, { shell: false });
let resolved = false;
const timeout = setTimeout(() => {
if (!resolved) {
resolved = true;
removeListeners();
reject(new Error('Server startup timed out after 30 seconds.'));
}
}, 30000);
// Define named listeners for proper cleanup
const onStdout = (data: Buffer) => {
const match = data.toString().match(/localhost:(\d+)/);
Eif (match && !resolved) {
resolved = true;
clearTimeout(timeout);
// Keep stderr listener for logging, remove startup listeners
this.process?.off('error', onError);
this.process?.off('exit', onExit);
this.process?.stdout?.off('data', onStdout);
resolve(parseInt(match[1], 10));
}
};
const onStderr = (data: Buffer) => {
console.error('[mehr stderr]', data.toString());
};
const onError = (err: Error) => {
Eif (!resolved) {
resolved = true;
clearTimeout(timeout);
removeListeners();
this.cleanup();
reject(new Error(`Failed to start mehr: ${err.message}`));
}
};
const onExit = (code: number | null) => {
Eif (!resolved && code !== 0 && code !== null) {
resolved = true;
clearTimeout(timeout);
removeListeners();
this.cleanup();
reject(new Error(`mehr exited with code ${code}`));
}
};
const removeListeners = () => {
this.process?.stdout?.off('data', onStdout);
this.process?.stderr?.off('data', onStderr);
this.process?.off('error', onError);
this.process?.off('exit', onExit);
};
this.process.stdout?.on('data', onStdout);
this.process.stderr?.on('data', onStderr);
this.process.on('error', onError);
this.process.on('exit', onExit);
});
}
/**
* Start mehr serve for a project.
* Uses random port (--port 0) to avoid conflicts.
* @returns The port number mehr is listening on.
*/
async start(projectPath: string): Promise<number> {
// Stop any existing process first
await this.stop();
this.stopped = false; // Reset for new server instance
const isWindows = process.platform === 'win32';
// Validate path
const validation = this.validatePath(projectPath);
if (!validation.ok) {
throw new Error(validation.error);
}
let cmd: string;
let args: string[];
let cwd: string | undefined;
if (isWindows) {
// Convert Windows path → WSL path, use cd to set working directory
const wslPath = this.toWslPath(projectPath);
cmd = 'wsl';
args = ['bash', '-c', `cd '${wslPath}' && mehr serve --port 0`];
cwd = undefined;
} else {
cmd = this.getMehrPath();
args = ['serve', '--port', '0'];
cwd = projectPath;
}
return new Promise((resolve, reject) => {
this.process = spawn(cmd, args, { cwd, shell: false });
let resolved = false;
const timeout = setTimeout(() => {
if (!resolved) {
resolved = true;
removeListeners();
reject(
new Error(
'Server startup timed out after 30 seconds.\n\nCheck that mehr is working: mehr --version'
)
);
}
}, 30000);
// Define named listeners for proper cleanup
const onStdout = (data: Buffer) => {
const match = data.toString().match(/localhost:(\d+)/);
Eif (match && !resolved) {
resolved = true;
clearTimeout(timeout);
// Keep stderr listener for logging, remove startup listeners
this.process?.off('error', onError);
this.process?.off('exit', onExit);
this.process?.stdout?.off('data', onStdout);
resolve(parseInt(match[1], 10));
}
};
const onStderr = (data: Buffer) => {
console.error('[mehr stderr]', data.toString());
};
const onError = (err: Error) => {
Eif (!resolved) {
resolved = true;
clearTimeout(timeout);
removeListeners();
this.cleanup();
reject(new Error(`Failed to start mehr: ${err.message}`));
}
};
const onExit = (code: number | null) => {
if (!resolved && code !== 0 && code !== null) {
resolved = true;
clearTimeout(timeout);
removeListeners();
this.cleanup();
reject(new Error(`mehr exited with code ${code}`));
}
};
const removeListeners = () => {
this.process?.stdout?.off('data', onStdout);
this.process?.stderr?.off('data', onStderr);
this.process?.off('error', onError);
this.process?.off('exit', onExit);
};
this.process.stdout?.on('data', onStdout);
this.process.stderr?.on('data', onStderr);
this.process.on('error', onError);
this.process.on('exit', onExit);
});
}
/**
* Validate a project path.
* Rejects UNC paths on Windows.
*/
private validatePath(winPath: string): PrerequisiteResult {
if (process.platform === 'win32') {
// Reject network paths (UNC)
if (winPath.startsWith('\\\\')) {
return {
ok: false,
error: 'Network paths (\\\\server\\share) are not supported.\n\nPlease use a local drive.',
};
}
// Validate drive letter format
if (!/^[A-Za-z]:\\/.test(winPath)) {
return {
ok: false,
error: 'Invalid path format.\n\nExpected: C:\\path\\to\\project',
};
}
}
return { ok: true };
}
/**
* Convert Windows path to WSL path.
* C:\Users\foo -> /mnt/c/Users/foo
*/
private toWslPath(winPath: string): string {
return winPath
.replace(/^([A-Za-z]):\\/, (_, drive: string) => `/mnt/${drive.toLowerCase()}/`)
.replace(/\\/g, '/');
}
/**
* Graceful shutdown: SIGTERM -> wait 5s -> SIGKILL.
* Safe to call multiple times - subsequent calls wait for the first to complete.
*/
async stop(): Promise<void> {
// Already stopped
if (this.stopped || !this.process) return;
// If already stopping, wait for that operation to complete
if (this.stopping && this.stopPromise) {
return this.stopPromise;
}
this.stopping = true;
const proc = this.process;
this.stopPromise = new Promise((resolve) => {
const forceKill = setTimeout(() => {
proc.kill('SIGKILL');
this.cleanup();
this.stopping = false;
this.stopped = true;
this.stopPromise = null;
resolve();
}, 5000);
// Use once() to auto-remove listener after first call
proc.once('exit', () => {
clearTimeout(forceKill);
this.cleanup();
this.stopping = false;
this.stopped = true;
this.stopPromise = null;
resolve();
});
proc.kill('SIGTERM');
});
return this.stopPromise;
}
}
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