"use strict";
/**
 * Cloud Run Streaming Service - Main Entry Point
 *
 * High-performance HTTP/2 + WebSocket server for massive concurrent connections.
 * Optimized for 500M concurrent learning streams with adaptive scaling.
 */
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.StreamingService = void 0;
const fastify_1 = __importDefault(require("fastify"));
const websocket_1 = __importDefault(require("@fastify/websocket"));
const compress_1 = __importDefault(require("@fastify/compress"));
const helmet_1 = __importDefault(require("@fastify/helmet"));
const rate_limit_1 = __importDefault(require("@fastify/rate-limit"));
const ws_1 = require("ws");
const vector_client_1 = require("./vector-client");
const load_balancer_1 = require("./load-balancer");
const api_1 = require("@opentelemetry/api");
const prom_client_1 = require("prom-client");
// Environment configuration
const CONFIG = {
    port: parseInt(process.env.PORT || '8080', 10),
    host: process.env.HOST || '0.0.0.0',
    nodeEnv: process.env.NODE_ENV || 'production',
    maxConnections: parseInt(process.env.MAX_CONNECTIONS || '100000', 10),
    requestTimeout: parseInt(process.env.REQUEST_TIMEOUT || '30000', 10),
    keepAliveTimeout: parseInt(process.env.KEEP_ALIVE_TIMEOUT || '65000', 10),
    headersTimeout: parseInt(process.env.HEADERS_TIMEOUT || '66000', 10),
    maxRequestsPerSocket: parseInt(process.env.MAX_REQUESTS_PER_SOCKET || '1000', 10),
    ruvectorHost: process.env.RUVECTOR_HOST || 'localhost:50051',
    enableTracing: process.env.ENABLE_TRACING === 'true',
    enableMetrics: process.env.ENABLE_METRICS !== 'false',
    gracefulShutdownTimeout: parseInt(process.env.GRACEFUL_SHUTDOWN_TIMEOUT || '10000', 10),
};
// Prometheus metrics
const metrics = {
    httpRequests: new prom_client_1.Counter({
        name: 'http_requests_total',
        help: 'Total number of HTTP requests',
        labelNames: ['method', 'path', 'status_code'],
    }),
    httpDuration: new prom_client_1.Histogram({
        name: 'http_request_duration_seconds',
        help: 'HTTP request duration in seconds',
        labelNames: ['method', 'path', 'status_code'],
        buckets: [0.01, 0.05, 0.1, 0.5, 1, 2.5, 5, 10],
    }),
    activeConnections: new prom_client_1.Gauge({
        name: 'active_connections',
        help: 'Number of active connections',
        labelNames: ['type'],
    }),
    streamingQueries: new prom_client_1.Counter({
        name: 'streaming_queries_total',
        help: 'Total number of streaming queries',
        labelNames: ['protocol', 'status'],
    }),
    vectorOperations: new prom_client_1.Histogram({
        name: 'vector_operations_duration_seconds',
        help: 'Vector operation duration in seconds',
        labelNames: ['operation', 'status'],
        buckets: [0.001, 0.005, 0.01, 0.05, 0.1, 0.5, 1],
    }),
    batchSize: new prom_client_1.Histogram({
        name: 'batch_size',
        help: 'Size of batched requests',
        buckets: [1, 5, 10, 25, 50, 100, 250, 500],
    }),
};
// Tracer
const tracer = api_1.trace.getTracer('streaming-service', '1.0.0');
// Connection manager
class ConnectionManager {
    constructor(vectorClient, loadBalancer) {
        this.vectorClient = vectorClient;
        this.loadBalancer = loadBalancer;
        this.httpConnections = new Set();
        this.wsConnections = new Set();
        this.batchQueue = new Map();
        this.batchTimer = null;
        this.BATCH_INTERVAL = 10; // 10ms batching window
        this.MAX_BATCH_SIZE = 100;
    }
    // HTTP connection tracking
    registerHttpConnection(reply) {
        this.httpConnections.add(reply);
        metrics.activeConnections.inc({ type: 'http' });
    }
    unregisterHttpConnection(reply) {
        this.httpConnections.delete(reply);
        metrics.activeConnections.dec({ type: 'http' });
    }
    // WebSocket connection tracking
    registerWsConnection(ws) {
        this.wsConnections.add(ws);
        metrics.activeConnections.inc({ type: 'websocket' });
        ws.on('close', () => {
            this.unregisterWsConnection(ws);
        });
    }
    unregisterWsConnection(ws) {
        this.wsConnections.delete(ws);
        metrics.activeConnections.dec({ type: 'websocket' });
    }
    // Request batching for efficiency
    async batchQuery(query) {
        return new Promise((resolve, reject) => {
            const batchKey = this.getBatchKey(query);
            if (!this.batchQueue.has(batchKey)) {
                this.batchQueue.set(batchKey, []);
            }
            const batch = this.batchQueue.get(batchKey);
            batch.push({ query, callback: (err, result) => {
                    if (err)
                        reject(err);
                    else
                        resolve(result);
                } });
            metrics.batchSize.observe(batch.length);
            // Process batch when full or after timeout
            if (batch.length >= this.MAX_BATCH_SIZE) {
                this.processBatch(batchKey);
            }
            else if (!this.batchTimer) {
                this.batchTimer = setTimeout(() => {
                    this.processAllBatches();
                }, this.BATCH_INTERVAL);
            }
        });
    }
    getBatchKey(query) {
        // Group similar queries for batching
        return `${query.collection || 'default'}_${query.operation || 'search'}`;
    }
    async processBatch(batchKey) {
        const batch = this.batchQueue.get(batchKey);
        if (!batch || batch.length === 0)
            return;
        this.batchQueue.delete(batchKey);
        const span = tracer.startSpan('process-batch', {
            attributes: { batchKey, batchSize: batch.length },
        });
        try {
            const queries = batch.map(item => item.query);
            const results = await this.vectorClient.batchQuery(queries);
            results.forEach((result, index) => {
                batch[index].callback(null, result);
            });
            span.setStatus({ code: api_1.SpanStatusCode.OK });
        }
        catch (error) {
            span.setStatus({ code: api_1.SpanStatusCode.ERROR, message: error.message });
            batch.forEach(item => item.callback(error, null));
        }
        finally {
            span.end();
        }
    }
    async processAllBatches() {
        this.batchTimer = null;
        const batchKeys = Array.from(this.batchQueue.keys());
        await Promise.all(batchKeys.map(key => this.processBatch(key)));
    }
    // Graceful shutdown
    async shutdown() {
        console.log('Starting graceful shutdown...');
        // Stop accepting new connections
        this.httpConnections.forEach(reply => {
            if (!reply.sent) {
                reply.code(503).send({ error: 'Service shutting down' });
            }
        });
        // Close WebSocket connections gracefully
        this.wsConnections.forEach(ws => {
            if (ws.readyState === ws_1.WebSocket.OPEN) {
                ws.send(JSON.stringify({ type: 'shutdown', message: 'Service shutting down' }));
                ws.close(1001, 'Service shutting down');
            }
        });
        // Process remaining batches
        await this.processAllBatches();
        console.log(`Closed ${this.httpConnections.size} HTTP and ${this.wsConnections.size} WebSocket connections`);
    }
    getStats() {
        return {
            httpConnections: this.httpConnections.size,
            wsConnections: this.wsConnections.size,
            pendingBatches: this.batchQueue.size,
        };
    }
}
// Main application setup
class StreamingService {
    constructor() {
        this.isShuttingDown = false;
        this.app = (0, fastify_1.default)({
            logger: {
                level: CONFIG.nodeEnv === 'production' ? 'info' : 'debug',
                serializers: {
                    req(request) {
                        return {
                            method: request.method,
                            url: request.url,
                            headers: request.headers,
                            remoteAddress: request.ip,
                        };
                    },
                },
            },
            trustProxy: true,
            http2: true,
            connectionTimeout: CONFIG.requestTimeout,
            keepAliveTimeout: CONFIG.keepAliveTimeout,
            requestIdHeader: 'x-request-id',
            requestIdLogLabel: 'requestId',
        });
        this.vectorClient = new vector_client_1.VectorClient({
            host: CONFIG.ruvectorHost,
            maxConnections: 100,
            enableMetrics: CONFIG.enableMetrics,
        });
        this.loadBalancer = new load_balancer_1.LoadBalancer({
            maxRequestsPerSecond: 10000,
            circuitBreakerThreshold: 0.5,
            circuitBreakerTimeout: 30000,
        });
        this.connectionManager = new ConnectionManager(this.vectorClient, this.loadBalancer);
        this.setupMiddleware();
        this.setupRoutes();
        this.setupShutdownHandlers();
    }
    setupMiddleware() {
        // Security headers
        this.app.register(helmet_1.default, {
            contentSecurityPolicy: false,
        });
        // Compression
        this.app.register(compress_1.default, {
            global: true,
            encodings: ['gzip', 'deflate', 'br'],
        });
        // Rate limiting
        this.app.register(rate_limit_1.default, {
            max: 1000,
            timeWindow: '1 minute',
            cache: 10000,
            allowList: ['127.0.0.1'],
            redis: process.env.REDIS_URL ? { url: process.env.REDIS_URL } : undefined,
        });
        // WebSocket support
        this.app.register(websocket_1.default, {
            options: {
                maxPayload: 1024 * 1024, // 1MB
                perMessageDeflate: true,
            },
        });
        // Request tracking
        this.app.addHook('onRequest', async (request, reply) => {
            const startTime = Date.now();
            reply.raw.on('finish', () => {
                const duration = (Date.now() - startTime) / 1000;
                const labels = {
                    method: request.method,
                    path: request.routerPath || request.url,
                    status_code: reply.statusCode.toString(),
                };
                metrics.httpRequests.inc(labels);
                metrics.httpDuration.observe(labels, duration);
            });
        });
        // Shutdown check
        this.app.addHook('onRequest', async (request, reply) => {
            if (this.isShuttingDown) {
                reply.code(503).send({ error: 'Service shutting down' });
            }
        });
    }
    setupRoutes() {
        // Health check endpoint
        this.app.get('/health', async (request, reply) => {
            const isHealthy = await this.vectorClient.healthCheck();
            const stats = this.connectionManager.getStats();
            if (isHealthy) {
                return {
                    status: 'healthy',
                    timestamp: new Date().toISOString(),
                    connections: stats,
                    version: process.env.SERVICE_VERSION || '1.0.0',
                };
            }
            else {
                reply.code(503);
                return {
                    status: 'unhealthy',
                    timestamp: new Date().toISOString(),
                    error: 'Vector client unhealthy',
                };
            }
        });
        // Readiness check
        this.app.get('/ready', async (request, reply) => {
            if (this.isShuttingDown) {
                reply.code(503);
                return { status: 'not ready', reason: 'shutting down' };
            }
            const stats = this.connectionManager.getStats();
            if (stats.httpConnections + stats.wsConnections >= CONFIG.maxConnections) {
                reply.code(503);
                return { status: 'not ready', reason: 'max connections reached' };
            }
            return { status: 'ready', connections: stats };
        });
        // Metrics endpoint
        this.app.get('/metrics', async (request, reply) => {
            reply.type('text/plain');
            return prom_client_1.register.metrics();
        });
        // SSE streaming endpoint
        this.app.get('/stream/sse/:collection', async (request, reply) => {
            const { collection } = request.params;
            const query = request.query;
            reply.raw.writeHead(200, {
                'Content-Type': 'text/event-stream',
                'Cache-Control': 'no-cache',
                'Connection': 'keep-alive',
                'X-Accel-Buffering': 'no', // Disable nginx buffering
            });
            this.connectionManager.registerHttpConnection(reply);
            const span = tracer.startSpan('sse-stream', {
                attributes: { collection, queryType: query.type || 'search' },
            });
            try {
                // Heartbeat to keep connection alive
                const heartbeat = setInterval(() => {
                    if (!reply.raw.destroyed) {
                        reply.raw.write(': heartbeat\n\n');
                    }
                    else {
                        clearInterval(heartbeat);
                    }
                }, 30000);
                // Stream results
                await this.vectorClient.streamQuery(collection, query, (chunk) => {
                    if (!reply.raw.destroyed) {
                        const data = JSON.stringify(chunk);
                        reply.raw.write(`data: ${data}\n\n`);
                    }
                });
                clearInterval(heartbeat);
                reply.raw.write('event: done\ndata: {}\n\n');
                reply.raw.end();
                metrics.streamingQueries.inc({ protocol: 'sse', status: 'success' });
                span.setStatus({ code: api_1.SpanStatusCode.OK });
            }
            catch (error) {
                this.app.log.error({ error, collection }, 'SSE stream error');
                metrics.streamingQueries.inc({ protocol: 'sse', status: 'error' });
                span.setStatus({ code: api_1.SpanStatusCode.ERROR, message: error.message });
                reply.raw.end();
            }
            finally {
                this.connectionManager.unregisterHttpConnection(reply);
                span.end();
            }
        });
        // WebSocket streaming endpoint
        this.app.get('/stream/ws/:collection', { websocket: true }, (connection, request) => {
            const { collection } = request.params;
            const ws = connection.socket;
            this.connectionManager.registerWsConnection(ws);
            const span = tracer.startSpan('websocket-stream', {
                attributes: { collection },
            });
            ws.on('message', async (message) => {
                try {
                    const query = JSON.parse(message.toString());
                    if (query.type === 'ping') {
                        ws.send(JSON.stringify({ type: 'pong', timestamp: Date.now() }));
                        return;
                    }
                    // Route through load balancer
                    const routed = await this.loadBalancer.route(collection, query);
                    if (!routed) {
                        ws.send(JSON.stringify({ type: 'error', error: 'Load balancer rejected request' }));
                        return;
                    }
                    // Stream results
                    await this.vectorClient.streamQuery(collection, query, (chunk) => {
                        if (ws.readyState === ws_1.WebSocket.OPEN) {
                            ws.send(JSON.stringify({ type: 'data', data: chunk }));
                        }
                    });
                    ws.send(JSON.stringify({ type: 'done' }));
                    metrics.streamingQueries.inc({ protocol: 'websocket', status: 'success' });
                }
                catch (error) {
                    this.app.log.error({ error, collection }, 'WebSocket message error');
                    ws.send(JSON.stringify({ type: 'error', error: error.message }));
                    metrics.streamingQueries.inc({ protocol: 'websocket', status: 'error' });
                }
            });
            ws.on('error', (error) => {
                this.app.log.error({ error }, 'WebSocket error');
                span.setStatus({ code: api_1.SpanStatusCode.ERROR, message: error.message });
            });
            ws.on('close', () => {
                span.setStatus({ code: api_1.SpanStatusCode.OK });
                span.end();
            });
        });
        // Batch query endpoint
        this.app.post('/query/batch', async (request, reply) => {
            const { queries } = request.body;
            if (!Array.isArray(queries) || queries.length === 0) {
                reply.code(400);
                return { error: 'queries must be a non-empty array' };
            }
            const span = tracer.startSpan('batch-query', {
                attributes: { queryCount: queries.length },
            });
            try {
                const results = await Promise.all(queries.map(query => this.connectionManager.batchQuery(query)));
                span.setStatus({ code: api_1.SpanStatusCode.OK });
                return { results };
            }
            catch (error) {
                this.app.log.error({ error }, 'Batch query error');
                span.setStatus({ code: api_1.SpanStatusCode.ERROR, message: error.message });
                reply.code(500);
                return { error: error.message };
            }
            finally {
                span.end();
            }
        });
        // Single query endpoint
        this.app.post('/query/:collection', async (request, reply) => {
            const { collection } = request.params;
            const query = request.body;
            const span = tracer.startSpan('single-query', {
                attributes: { collection, queryType: query.type || 'search' },
            });
            try {
                const result = await this.connectionManager.batchQuery({ collection, ...query });
                span.setStatus({ code: api_1.SpanStatusCode.OK });
                return result;
            }
            catch (error) {
                this.app.log.error({ error, collection }, 'Query error');
                span.setStatus({ code: api_1.SpanStatusCode.ERROR, message: error.message });
                reply.code(500);
                return { error: error.message };
            }
            finally {
                span.end();
            }
        });
    }
    setupShutdownHandlers() {
        const shutdown = async (signal) => {
            console.log(`Received ${signal}, starting graceful shutdown...`);
            this.isShuttingDown = true;
            const timeout = setTimeout(() => {
                console.error('Graceful shutdown timeout, forcing exit');
                process.exit(1);
            }, CONFIG.gracefulShutdownTimeout);
            try {
                await this.connectionManager.shutdown();
                await this.vectorClient.close();
                await this.app.close();
                clearTimeout(timeout);
                console.log('Graceful shutdown completed');
                process.exit(0);
            }
            catch (error) {
                console.error('Error during shutdown:', error);
                clearTimeout(timeout);
                process.exit(1);
            }
        };
        process.on('SIGTERM', () => shutdown('SIGTERM'));
        process.on('SIGINT', () => shutdown('SIGINT'));
    }
    async start() {
        try {
            await this.vectorClient.initialize();
            await this.app.listen({ port: CONFIG.port, host: CONFIG.host });
            console.log(`Streaming service running on ${CONFIG.host}:${CONFIG.port}`);
            console.log(`Environment: ${CONFIG.nodeEnv}`);
            console.log(`Max connections: ${CONFIG.maxConnections}`);
        }
        catch (error) {
            this.app.log.error(error);
            process.exit(1);
        }
    }
}
exports.StreamingService = StreamingService;
// Start service if run directly
if (require.main === module) {
    const service = new StreamingService();
    service.start();
}
//# sourceMappingURL=streaming-service.js.map