import fs from 'fs';
import path from 'path';
import { McpSettings } from '../../types/index.js';
import { getSettingsPath, clearSettingsCache } from '../../config/index.js';
/**
* Abstract base class for JSON file-based DAO implementations
*/
export abstract class JsonFileBaseDao {
private settingsCache: McpSettings | null = null;
private lastModified: number = 0;
/**
* Load settings from JSON file with caching
*/
protected async loadSettings(): Promise<McpSettings> {
try {
const settingsPath = getSettingsPath();
const stats = fs.statSync(settingsPath);
const fileModified = stats.mtime.getTime();
// Check if cache is still valid
if (this.settingsCache && this.lastModified >= fileModified) {
return this.settingsCache;
}
const settingsData = fs.readFileSync(settingsPath, 'utf8');
const settings = JSON.parse(settingsData) as McpSettings;
// Update cache
this.settingsCache = settings;
this.lastModified = fileModified;
return settings;
} catch (error) {
console.error(`Failed to load settings:`, error);
const defaultSettings: McpSettings = {
mcpServers: {},
users: [],
groups: [],
systemConfig: {},
userConfigs: {},
};
// Cache default settings
this.settingsCache = defaultSettings;
this.lastModified = Date.now();
return defaultSettings;
}
}
/**
* Save settings to JSON file and update cache
*/
protected async saveSettings(settings: McpSettings): Promise<void> {
try {
// Ensure directory exists
const settingsPath = getSettingsPath();
const dir = path.dirname(settingsPath);
if (!fs.existsSync(dir)) {
fs.mkdirSync(dir, { recursive: true });
}
fs.writeFileSync(settingsPath, JSON.stringify(settings, null, 2), 'utf8');
// Update cache
this.settingsCache = settings;
this.lastModified = Date.now();
clearSettingsCache();
} catch (error) {
console.error(`Failed to save settings:`, error);
throw error;
}
}
/**
* Clear settings cache
*/
protected clearCache(): void {
this.settingsCache = null;
this.lastModified = 0;
clearSettingsCache();
}
/**
* Get cache status for debugging
*/
protected getCacheInfo(): { hasCache: boolean; lastModified: number } {
return {
hasCache: this.settingsCache !== null,
lastModified: this.lastModified,
};
}
}
