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feat: add graceful shutdown with in-flight request drain (#732) #916

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feat: add graceful shutdown with in-flight request drain (#732) #916

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46 changes: 45 additions & 1 deletion backend/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ import rateLimit from "express-rate-limit";
import swaggerUi from "swagger-ui-express";
import { z } from "zod";
import { createServer } from "http";
import { searchStreamsFts, getAllowedAssets, addAllowedAsset, removeAllowedAsset } from "./services/db";
import { searchStreamsFts, getAllowedAssets, addAllowedAsset, removeAllowedAsset, getDb, isPostgres } from "./services/db";
import { initWebSocket } from "./services/websocket";
import {
normalizeUnknownApiError,
Expand All @@ -30,6 +30,7 @@ import { fetchOpenIssues } from "./services/openIssues";
import {
initIndexer,
startIndexer,
stopIndexer,
getCircuitBreakerStatus,
} from "./services/indexer";
import { adminAuth } from "./middleware/adminAuth";
Expand Down Expand Up @@ -1963,6 +1964,49 @@ async function startServer() {
server.listen(config.port, () => {
logger.info({ port: config.port }, "StellarStream API listening with WebSocket support");
});

let isShuttingDown = false;
const gracefulShutdown = (signal: string) => {
if (isShuttingDown) return;
isShuttingDown = true;
logger.info({ signal }, "shutdown signal received, starting graceful shutdown");

const startTime = Date.now();

stopIndexer();

server.close((err) => {
if (err) {
logger.error({ err }, "error closing HTTP server");
}

try {
const db = getDb();
if (!isPostgres()) {
db.pragma("wal_checkpoint(TRUNCATE)");
}
db.close();
} catch (dbErr) {
logger.error({ err: dbErr }, "error checkpointing database");
}

const durationMs = Date.now() - startTime;
logger.info({ durationMs }, "graceful shutdown completed");
process.exit(err ? 1 : 0);
});

if ('closeIdleConnections' in server) {
(server as any).closeIdleConnections();
}

setTimeout(() => {
logger.error("graceful shutdown timed out after 30s, forcing exit");
process.exit(1);
}, 30000).unref();
};

process.on("SIGTERM", () => gracefulShutdown("SIGTERM"));
process.on("SIGINT", () => gracefulShutdown("SIGINT"));
}

if (require.main === module) {
Expand Down