Update NATS connection to handle using a KV store to track last update

Switch Dockerfile to use absolute paths

Dockerfile

@@ -20,7 +20,7 @@ WORKDIR /app
 COPY package*.json ./
 RUN npm ci --omit=dev
 
-COPY --from=builder /app/dist ./dist
+COPY --from=builder /app/dist /app/dist
 
 USER node
 

src/config.ts

@@ -0,0 +1,79 @@
+import { readFileSync, existsSync } from "node:fs"
+import { join } from "node:path"
+import { log } from "./logger.js";
+
+interface Config {
+    Mq: Mq,
+    S3: S3,
+    Mongo: Mongo,
+    General: GeneralConfig,
+}
+
+export interface Mq {
+    MQ_USER: string;
+    MQ_PASS: string;
+    MQ_URL: string;
+    MQ_TOPIC: string;
+}
+
+export interface S3 {
+    S3_ENDPOINT: string;
+    S3_BUCKET: string;
+    S3_ACCESS_KEY: string;
+    S3_SECRET_KEY: string;
+    S3_REGION: string;
+}
+
+export interface Mongo {
+    MONGO_URI: string;
+    MONGO_DB: string;
+    MONGO_USER: string;
+    MONGO_PASS: string;
+}
+
+export interface GeneralConfig {
+    TOC: string;
+}
+
+export function ConfigLoader(): Config {
+    const cfg: Config = {
+        Mq: {
+            MQ_URL: getConfig("MQ_URL"),
+            MQ_TOPIC: getConfig("MQ_TOPIC"),
+            MQ_USER: getConfig("MQ_USER"),
+            MQ_PASS: getConfig("MQ_PASS"),
+        },
+        S3: {
+            S3_ENDPOINT: getConfig("S3_ENDPOINT"),
+            S3_BUCKET: getConfig("S3_BUCKET"),
+            S3_ACCESS_KEY: getConfig("S3_ACCESS_KEY"),
+            S3_SECRET_KEY: getConfig("S3_SECRET_KEY"),
+            S3_REGION: getConfig("S3_REGION"),
+        },
+        Mongo: {
+            MONGO_URI: getConfig("MONGO_URI"),
+            MONGO_DB: getConfig("MONGO_DB"),
+            MONGO_USER: getConfig("MONGO_USER"),
+            MONGO_PASS: getConfig("MONGO_PASS"),
+        },
+        General: {
+            TOC: getConfig("TOC"),
+        }
+    };
+
+    return cfg
+}
+
+function getConfig(key: string): string {
+    const filePath = join("/etc/secrets", key);
+    if (existsSync(filePath)) {
+        try {
+            return readFileSync(filePath, "utf8").trim();
+        } catch (err) {
+            log("ERROR", `Error reading secret file at ${filePath}: ${err}`);
+        }
+    }
+
+    return process.env[key] || ""
+}
+

src/database.ts

@@ -1,62 +0,0 @@
-// Functions to check the current applied version
-// updating will be handled by the processing service
-
-import { MongoClient } from "mongodb";
-import { log } from "./logger";
-
-const uri = process.env.MONGO_URI || "";
-const db = process.env.MONGO_DB || "";
-const user = process.env.MONGO_USER || "";
-const pass = process.env.MONGO_PASS || "";
-const collection = "data_ingress_meta";
-
-if(!uri || !db || !user || !pass) {
-    log('ERROR', "Missing MONGO Configuration - EXIT CODE: 35");
-    process.exit(35);
-} else {
-    log("DEBUG", `MongoDB Connection`, {
-        uri: uri,
-        db: db,
-        collection: collection,
-        user: user,
-        pass: "****",
-    });
-};
-
-const CONNECTION_URI = `mongodb://${encodeURIComponent(user)}:${encodeURIComponent(pass)}@${uri}`;
-
-let mongoClient: MongoClient | null = null;
-
-async function getMongoClient() {
-    if (mongoClient) return mongoClient;
-
-    mongoClient = new MongoClient(CONNECTION_URI);
-    await mongoClient.connect();
-    return mongoClient;
-}
-
-export async function isPackageProcessed(serviceName: string, packageName: string): Promise<boolean> {
-    try {
-        const client = await getMongoClient();
-        const database = client.db(db);
-        const coll = database.collection(collection);
-
-        const result = await coll.findOne({ service_name: serviceName });
-
-        if (!result) {
-            log('INFO', `No metadata found for ${serviceName}.  Fetching PIS Data`);
-            return false;
-        }
-
-        if (result.latest_package === packageName) {
-            log('INFO', 'No update needed');
-            return true;
-        }
-
-        log('INFO', `Version mismatch.  DB: ${result.latest_package}, Current: ${packageName}.  Update required`)
-        return false;
-    } catch (err) {
-        log('ERROR', 'Failed to check Mongo for version state:', err);
-        process.exit(1);
-    }
-}

src/index.ts

@@ -4,13 +4,39 @@ import { processAndStore } from './sss.js'
 
 import { getLatestPackageName, getRequestStream } from './sources/gitea.js'
 import { processPisStream } from './process.js'
-import { isPackageProcessed } from './database.js'
+import { ConfigLoader } from './config.js'
+import { natsManager } from './nats.js'
+
+async function exit(exitCode: string | number=0): Promise<void> {
+    log("INFO", `Exiting with code: ${exitCode}`);
+    
+    try {
+        await natsManager.close();
+    } catch (err) {
+        log("ERROR", `Error during cleanup: ${err}`);
+        process.exit(1)
+    }
+
+    process.exit(exitCode);
+}
 
 async function main() {
     const SERVICE_NAME = process.env.SERVICE_NAME;
     if (!SERVICE_NAME) {
         log('ERROR', "SERVICE_NAME env variable must be set");
-        process.exit(1);
+        process.exitCode = 1;
+        return;
+    }
+
+    const CURRENT_VERSION_KEY: string = `${SERVICE_NAME}-current-version`;
+
+    const config = ConfigLoader();
+
+    try {
+        log('INFO', `Initialising NATS`);
+        await natsManager.connect(config.Mq);
+    } catch (err) {
+        log('ERROR', `Unable to connect to NATS: ${err}`);
     }
 
     try {
@@ -19,26 +45,34 @@ async function main() {
 
         if (!packageInfo.assets[0]?.browser_download_url) {
             log('ERROR', `No attachments found for release ${packageInfo.name}`);
-            process.exit(9);
+            process.exitCode = 1;
+            return;
         }
 
-        if (await isPackageProcessed(SERVICE_NAME, packageInfo.name)) {
-            log('INFO', `Database matches latest release.  Exiting`);
-            process.exit(0);
+        const lastAppliedVersion: string | null = await natsManager.getState(CURRENT_VERSION_KEY);
+        if (lastAppliedVersion === packageInfo.name) {
+            log('INFO', "No new data, exiting");
+            return;
         }
 
         const inputStream: Readable = await getRequestStream(packageInfo.assets[0].browser_download_url);
-        const objectGenerator = processPisStream(inputStream);
+        const objectGenerator = processPisStream(config.General, inputStream);
 
         const filename = `${packageInfo.name.replace(/\s+/g, '_')}_pis_data_ndjson`;
 
         log('DEBUG', `Processing stream to: ${filename}`);
 
-        await processAndStore(objectGenerator, filename);
+        await processAndStore(config.S3, objectGenerator, filename);
         log('DEBUG', 'Done');
+
+        log('DEBUG', "Sending message to NATS");
+        await natsManager.sendFileUpdateMessage(filename, packageInfo.name, SERVICE_NAME);
+        await natsManager.setState(CURRENT_VERSION_KEY, packageInfo.name);
     } catch (err) {
         log('ERROR', 'Fatal error in pipeline: ', err);
-        process.exit(7);
+        process.exitCode = 1;
+    } finally {
+        await exit(process.exitCode || 0);
     }
 }
 

src/nats.ts

@@ -1,39 +1,104 @@
-import { connect, JSONCodec } from "nats";
-import type { ConnectionOptions, NatsConnection, Payload } from "nats";
-import { log } from "./logger";
+import { connect, JSONCodec, StringCodec } from "nats";
+import type { ConnectionOptions, NatsConnection, JetStreamClient, KV } from "nats";
+import { log } from "./logger.js";
 import { hostname } from "node:os";
 import type { MQFileUpdate } from "@owlboard/backend-data-contracts/dist/data-ingress_mq-file-update";
+import type { Mq } from "./config.js";
 
 const jc = JSONCodec();
+const sc = StringCodec();
 
-async function getNatsConnection(): Promise<NatsConnection> {
-    const serverUrl = process.env.MQ_URL || "nats://localhost:4222";
+class NatsManager {
+    private nc: NatsConnection | null = null;
+    private js: JetStreamClient | null = null;
+    private kv: KV | null = null;
+    private bucketName = "INGRESS_STATES";
+
+    /**
+     * Opens connection to NATS
+     */
+    async connect(cfg: Mq): Promise<void> {
+        if (this.nc) return;
 
         const options: ConnectionOptions = {
-        servers: serverUrl,
+            servers: cfg.MQ_URL,
             name: hostname(),
             reconnect: true,
             maxReconnectAttempts: -1,
+            waitOnFirstConnect: true,
         };
 
-    if (process.env.MQ_USER && process.env.MQ_PASS) {
-        options.user = process.env.MQ_USER;
-        options.pass = process.env.MQ_PASS;
-        log("INFO", "NATS: Using username/password authentication");
-    } else {
-        log("INFO", "NATS: Connecting without authentication");
+        if (cfg.MQ_USER && cfg.MQ_PASS) {
+            options.user = cfg.MQ_USER;
+            options.pass = cfg.MQ_PASS;
+            log("INFO", "NATS: Using auth credentials");
         }
 
-    return await connect(options)
-}
+        try {
+            this.nc = await connect(options);
+            this.js = this.nc.jetstream();
+            log("INFO", `NATS: Connected to ${cfg.MQ_URL}`);
+
+            // Handle connection close events
+            this.nc.closed().then((err) => {
+                log("ERROR", `NATS: Connection closed: ${err}`);
+                this.nc = null;
+                this.js = null;
+                this.kv = null;
+            });
+        } catch (err) {
+            log("ERROR", `NATS: Initial connection failed: ${err}`);
+            throw err;
+        }
+    }
+
+    /**
+     * Accessor for the KV store
+     */
+    private async getKV(): Promise<KV> {
+        if (!this.js) throw new Error("NATS: JetStream not initialized. Call connect() first.");
+        if (!this.kv) {
+            this.kv = await this.js.views.kv(this.bucketName);
+        }
+        return this.kv;
+    }
+
+    /**
+     * Get the last recorded state/hash for a service
+     */
+    async getState(key: string): Promise<string | null> {
+        try {
+            const store = await this.getKV();
+            const entry = await store.get(key);
+            return entry ? sc.decode(entry.value) : null;
+        } catch (err) {
+            log("ERROR", `NATS: KV Get failed for ${key}: ${err}`);
+            return null;
+        }
+    }
+
+    /**
+     * Set the current state/hash for a service
+     */
+    async setState(key: string, value: string): Promise<void> {
+        try {
+            const store = await this.getKV();
+            await store.put(key, sc.encode(value));
+        } catch (err) {
+            log("ERROR", `NATS: KV Set failed for ${key}: ${err}`);
+            throw err;
+        }
+    }
+
+    /**
+     * Publishes message to the JetStream
+     */
+    async sendFileUpdateMessage(path: string, version: string, serviceName: string): Promise<boolean> {
+        if (!this.js) throw new Error("NATS: JetStream not initialized");
 
-// Send Message Function here to send the message to NATS
-export async function sendFileUpdateMessage(path: string, version: string): Promise<boolean> {
-    const serviceName: string = "pis-data-ingress";
-    const serviceId: string = hostname();
         const message: MQFileUpdate = {
-        service_name: "pis-data-ingress",
-        service_id: serviceId,
+            service_name: serviceName,
+            service_id: hostname(),
             sent_timestamp: Math.floor(Date.now() / 1000),
             data_type: "file",
             data_kind: "pis",
@@ -43,20 +108,25 @@ export async function sendFileUpdateMessage(path: string, version: string): Prom
             }
         };
 
-    let nats: NatsConnection | undefined;
-
-    try {
-        const nats: NatsConnection = await getNatsConnection();
-
         const subject = `ingress.file.${message.data_kind}`;
 
-        nats.publish(subject, jc.encode(message));
-
-        await nats.drain();
-        return true
+        try {
+            await this.js.publish(subject, jc.encode(message));
+            log("INFO", `NATS: Message published to ${subject}`);
+            return true;
         } catch (err) {
-        log("ERROR", `NATS: Failed to send message: ${err}`);
-        if (nats) {nats.close()}
+            log("ERROR", `NATS: Failed to publish to JetStream: ${err}`);
             return false;
         }
+    }
+
+    async close() {
+        if (this.nc) {
+            await this.nc.drain();
+            this.nc = null;
+        }
+    }
 }
+
+// Export instance
+export const natsManager = new NatsManager();

src/process.ts

@@ -3,6 +3,7 @@ import { createInterface } from 'node:readline';
 import XXH from 'xxhashjs';
 import { log } from './logger.js';
 import { DataIngressPisData } from '@owlboard/backend-data-contracts';
+import type { GeneralConfig } from './config.js';
 
 const BASE_URL = process.env.BASEURL || 'https://owlboard.info'
 
@@ -18,8 +19,8 @@ interface InputRecord {
     stops: string[];
 }
 
-export async function* processPisStream(inputStream: Readable) {
-    const TOC = process.env.TOC;
+export async function* processPisStream(cfg: GeneralConfig, inputStream: Readable) {
+    const TOC = cfg.TOC;
     if (!TOC) {
         log('ERROR', "TOC not set: Exit code 19");
         process.exit(19);
@@ -35,7 +36,7 @@ export async function* processPisStream(inputStream: Readable) {
         if (!line.trim()) continue;
 
         const record = JSON.parse(line) as InputRecord;
-        log('DEBUG', `JSON Line Parsed: ${JSON.stringify(record)}`)
+        // log('DEBUG', `JSON Line Parsed: ${JSON.stringify(record)}`)
 
         const crsHash = XXH.h64(record.stops.join('|'), SEED);
         const tiplocStops = await mapStopsToTiploc(record.stops);

src/sss.ts

@@ -1,11 +1,13 @@
-import { S3Client } from "@aws-sdk/client-s3";
+import { S3Client, CreateBucketCommand, HeadBucketCommand, S3ServiceException } from "@aws-sdk/client-s3";
 import { Upload } from "@aws-sdk/lib-storage";
 import { createWriteStream } from "node:fs";
 import { Readable } from "node:stream";
 import { DataIngressPisData } from "@owlboard/backend-data-contracts";
 import { log } from "./logger.js";
+import type { S3 } from "./config.js";
 
 export async function processAndStore(
+    cfg: S3,
     generator: AsyncGenerator<DataIngressPisData.PisObjects>,
     filename: string
 ) {
@@ -15,29 +17,45 @@ export async function processAndStore(
         }
     })());
 
-    const useS3 = process.env.S3_ENDPOINT && process.env.S3_BUCKET;
+    const useS3 = cfg.S3_ENDPOINT && cfg.S3_BUCKET;
 
     if (useS3) {
-        if (!process.env.S3_ENDPOINT || process.env.S3_BUCKET || !process.env.S3_REGION || !process.env.S3_ACCESS_KEY || !process.env.S3_SECRET_KEY) {
+        if (!cfg.S3_ENDPOINT || !cfg.S3_BUCKET || !cfg.S3_REGION || !cfg.S3_ACCESS_KEY || !cfg.S3_SECRET_KEY) {
             log("DEBUG", "Missing required variables for S3 Support - EXIT CODE 24");
             process.exit(24);
         }
-        log('INFO', `Streaming to S3: ${process.env.S3_BUCKET}/${filename}`);
+
+        log("DEBUG", "Opening connection to S3 Server");
 
         const client = new S3Client({
-            endpoint: process.env.S3_ENDPOINT,
-            region: process.env.S3_REGION,
+            endpoint: cfg.S3_ENDPOINT,
+            region: cfg.S3_REGION,
             credentials: {
-                accessKeyId: process.env.S3_ACCESS_KEY!,
-                secretAccessKey: process.env.S3_SECRET_KEY,
+                accessKeyId: cfg.S3_ACCESS_KEY!,
+                secretAccessKey: cfg.S3_SECRET_KEY,
             },
             forcePathStyle: true,
         });
 
+        // Check bucket exists, and create if needed
+        try {
+            await client.send(new HeadBucketCommand({ Bucket: cfg.S3_BUCKET }));
+        } catch (err) {
+            if (err instanceof S3ServiceException && err.$metadata.httpStatusCode === 404) {
+                log('INFO', `Bucket ${cfg.S3_BUCKET} does not exist, creating...`);
+                await client.send(new CreateBucketCommand({ Bucket: cfg.S3_BUCKET }));
+            } else {
+                log(`ERROR`, `Failed to verify bucket: ${cfg.S3_BUCKET}`);
+                process.exit(21);
+            }
+        }
+
+        log('INFO', `Streaming to S3: ${cfg.S3_BUCKET}/${filename}`);
+
         const upload = new Upload({
             client,
             params: {
-                Bucket: process.env.S3_BUCKET,
+                Bucket: cfg.S3_BUCKET,
                 Key: filename,
                 Body: ndjsonStream,
                 ContentType: "application/x-ndjson",