feat: initialize federation service v1

src/lib/fetchFederatedEvents.ts

@@ -0,0 +1,146 @@
+import { readFileSync } from 'fs';
+import { join } from 'path';
+import { logger } from '$lib/logger';
+import type { Event } from '$lib/types';
+
+import config from '../../federation.config.js';
+
+console.log(config.instances);
+
+interface FederationConfig {
+	name: string;
+	instances: Array<{ url: string }>;
+}
+
+interface FederationEventsResponse {
+	events: Array<Event & { federation?: boolean }>;
+	count?: number;
+}
+
+/**
+ * Reads the federation config file
+ */
+async function readFederationConfig(): Promise<FederationConfig | null> {
+	try {
+		const configPath = join(process.cwd(), 'federation.config.js');
+
+		// Use dynamic import to load the config file as a module
+		// This is safer than eval and works with ES modules
+		const configModule = await import(configPath + '?t=' + Date.now());
+		const config = (configModule.default || configModule.config) as FederationConfig;
+
+		if (config && config.instances && Array.isArray(config.instances)) {
+			return config;
+		}
+
+		logger.warn('Invalid federation config structure');
+		return null;
+	} catch (error) {
+		// If dynamic import fails, try reading as text and parsing
+		try {
+			const configPath = join(process.cwd(), 'federation.config.js');
+			const configContent = readFileSync(configPath, 'utf-8');
+
+			// Try to extract JSON-like structure
+			const configMatch = configContent.match(/instances:\s*\[([\s\S]*?)\]/);
+			if (configMatch) {
+				// Simple parsing - extract URLs
+				const urlMatches = configContent.matchAll(/url:\s*['"]([^'"]+)['"]/g);
+				const instances = Array.from(urlMatches, (match) => ({ url: match[1] }));
+
+				if (instances.length > 0) {
+					return {
+						name: 'Federated Instances',
+						instances
+					};
+				}
+			}
+		} catch (fallbackError) {
+			logger.error({ error: fallbackError }, 'Error parsing federation.config.js as fallback');
+		}
+
+		logger.error({ error }, 'Error reading federation.config.js');
+		return null;
+	}
+}
+
+/**
+ * Fetches events from a single federated instance
+ */
+async function fetchEventsFromInstance(instanceUrl: string): Promise<Event[]> {
+	try {
+		// Ensure URL has protocol and append /api/events
+
+		const apiUrl = `http://${instanceUrl}/api/events`;
+
+		logger.debug({ apiUrl }, 'Fetching events from federated instance');
+
+		const response = await fetch(apiUrl, {
+			method: 'GET',
+			headers: {
+				Accept: 'application/json'
+			},
+			signal: AbortSignal.timeout(10000) // 10 second timeout
+		});
+
+		if (!response.ok) {
+			logger.warn({ apiUrl, status: response.status }, 'Failed to fetch events from instance');
+			return [];
+		}
+
+		const data = (await response.json()) as FederationEventsResponse;
+
+		if (!data.events || !Array.isArray(data.events)) {
+			logger.warn({ apiUrl }, 'Invalid events response structure');
+			return [];
+		}
+
+		// Mark events as federated and add source URL
+		const federatedEvents: Event[] = data.events.map((event) => ({
+			...event,
+			federation: true,
+			federation_url: `http://${instanceUrl}`
+		}));
+
+		logger.info(
+			{ apiUrl, eventCount: federatedEvents.length },
+			'Successfully fetched federated events'
+		);
+		return federatedEvents;
+	} catch (error) {
+		logger.error(
+			{ instanceUrl, error: error instanceof Error ? error.message : 'Unknown error' },
+			'Error fetching events from instance'
+		);
+		return [];
+	}
+}
+
+/**
+ * Fetches events from all configured federated instances
+ */
+export async function fetchAllFederatedEvents(): Promise<Event[]> {
+	const config = await readFederationConfig();
+
+	if (!config || !config.instances || config.instances.length === 0) {
+		logger.debug('No federation config or instances found');
+		return [];
+	}
+
+	logger.info(
+		{ instanceCount: config.instances.length },
+		'Fetching events from federated instances'
+	);
+
+	// Fetch from all instances in parallel
+	const fetchPromises = config.instances.map((instance) => fetchEventsFromInstance(instance.url));
+
+	const results = await Promise.all(fetchPromises);
+
+	// Flatten all events into a single array
+	const allFederatedEvents = results.flat();
+
+	logger.info({ totalEvents: allFederatedEvents.length }, 'Completed fetching federated events');
+
+	return allFederatedEvents;
+}