op-packages/luci-app-linkback/root/usr/share/rpcd/ucode/luci.linkback

'use strict';

import { readfile } from 'fs';
import { popen } from 'fs';

const STATUS_FILE = '/var/run/linkback.json';

const methods = {
	get_status: {
		call: function() {
			let content = readfile(STATUS_FILE);
			let status = null;

			if (content) {
				try {
					status = json(content);
				} catch (err) {
					// Handle JSON parse error gracefully
				}
			}

			if (!status) {
				status = {
					enabled: false,
					mode: "multi_wan",
					interface: "wan",
					check_interval: 5,
					active_link: "none",
					links: []
				};
			}

			return status;
		}
	},

	get_log: {
		call: function() {
			// Extract last 100 lines of linkbackd logs from syslog
			let p = popen('logread -e linkbackd | tail -n 100', 'r');
			let log_content = '';
			if (p) {
				log_content = p.read('all');
				p.close();
			}
			return { log: log_content || 'No logs available.' };
		}
	},

	manage_service: {
		args: { action: 'string' },
		call: function(request) {
			let action = request.args?.action;
			if (action !== 'start' && action !== 'stop' && action !== 'restart') {
				return { success: false, error: 'Invalid action' };
			}

			let cmd = `/etc/init.d/linkback ${action} >/dev/null 2>&1`;
			let rc = system(cmd);
			
			return { success: (rc === 0) };
		}
	}
};

return { 'luci.linkback': methods };