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“Naeel” 2026-02-23 20:08:48 +04:00
parent 29206538ef
commit a5493c7375
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4
README.md
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@ -2,6 +2,8 @@
Consumes CRUD messages from RabbitMQ and writes to Postgres. Consumes CRUD messages from RabbitMQ and writes to Postgres.
Комментарий: воркер специально пишет в таблицу демо и не хранит собственное состояние, кроме метрик в памяти.
## Environment variables ## Environment variables
RabbitMQ: RabbitMQ:
@ -20,3 +22,5 @@ Postgres:
## Notes ## Notes
Health endpoint: `/healthz`. Health endpoint: `/healthz`.
HTML-страница со статусом доступна на `/`.

13
server.js
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@ -2,12 +2,14 @@ const http = require("http");
const amqp = require("amqplib"); const amqp = require("amqplib");
const { Pool } = require("pg"); const { Pool } = require("pg");
// Состояние процесса для /healthz и статуса в UI.
const status = { const status = {
state: "starting", state: "starting",
error: "", error: "",
lastSuccess: "", lastSuccess: "",
}; };
// Метрики обработки сообщений (показываются на HTML-странице).
const metrics = { const metrics = {
processed: 0, processed: 0,
failed: 0, failed: 0,
@ -16,6 +18,7 @@ const metrics = {
lastAction: "", lastAction: "",
}; };
// Унифицированное обновление состояния.
function setStatus(state, error) { function setStatus(state, error) {
status.state = state; status.state = state;
status.error = error || ""; status.error = error || "";
@ -24,6 +27,7 @@ function setStatus(state, error) {
} }
} }
// HTML-страница со статусом и счетчиками.
function renderStatusPage() { function renderStatusPage() {
const queueName = (process.env.RABBIT_QUEUES || "crud_queue").split(",")[0] || "crud_queue"; const queueName = (process.env.RABBIT_QUEUES || "crud_queue").split(",")[0] || "crud_queue";
const tableName = process.env.PG_TABLE || "rabbit_messages"; const tableName = process.env.PG_TABLE || "rabbit_messages";
@ -80,6 +84,7 @@ function renderStatusPage() {
</html>`; </html>`;
} }
// Подготовка конфигурации PG (DATABASE_URL имеет приоритет).
function buildPgConfig() { function buildPgConfig() {
if (process.env.DATABASE_URL) { if (process.env.DATABASE_URL) {
return { return {
@ -98,6 +103,7 @@ function buildPgConfig() {
}; };
} }
// Собираем AMQP URL из переменных окружения.
function buildAmqpUrl() { function buildAmqpUrl() {
if (process.env.AMQP_URL) { if (process.env.AMQP_URL) {
return process.env.AMQP_URL; return process.env.AMQP_URL;
@ -115,12 +121,14 @@ function buildAmqpUrl() {
const pool = new Pool(buildPgConfig()); const pool = new Pool(buildPgConfig());
// Минимальная таблица для демо, если БД пустая.
async function ensureTable(table) { async function ensureTable(table) {
await pool.query( await pool.query(
`CREATE TABLE IF NOT EXISTS ${table} (id SERIAL PRIMARY KEY, test_data TEXT, created_at TIMESTAMP DEFAULT NOW())` `CREATE TABLE IF NOT EXISTS ${table} (id SERIAL PRIMARY KEY, test_data TEXT, created_at TIMESTAMP DEFAULT NOW())`
); );
} }
// Парсим JSON, нормализуем ключи, иначе считаем текстом.
function parseMessage(buffer) { function parseMessage(buffer) {
const body = buffer.toString("utf8"); const body = buffer.toString("utf8");
try { try {
@ -143,6 +151,7 @@ function parseMessage(buffer) {
} }
} }
// CRUD-операции по сообщению.
async function handleMessage(table, msg) { async function handleMessage(table, msg) {
const action = (msg.action || "create").toLowerCase(); const action = (msg.action || "create").toLowerCase();
if (action === "create") { if (action === "create") {
@ -167,6 +176,7 @@ async function handleMessage(table, msg) {
throw new Error("invalid action"); throw new Error("invalid action");
} }
// Небольшой HTTP-сервер для /healthz и HTML-статуса.
function startHttpServer() { function startHttpServer() {
const port = process.env.PORT || 3000; const port = process.env.PORT || 3000;
const server = http.createServer((req, res) => { const server = http.createServer((req, res) => {
@ -183,6 +193,7 @@ function startHttpServer() {
}); });
} }
// Основной цикл: подключение к RabbitMQ и обработка сообщений.
async function consumeLoop() { async function consumeLoop() {
const table = process.env.PG_TABLE || "rabbit_messages"; const table = process.env.PG_TABLE || "rabbit_messages";
const queueName = (process.env.RABBIT_QUEUES || "crud_queue") const queueName = (process.env.RABBIT_QUEUES || "crud_queue")
@ -193,6 +204,7 @@ async function consumeLoop() {
const prefetch = Number(process.env.RABBIT_PREFETCH || "1"); const prefetch = Number(process.env.RABBIT_PREFETCH || "1");
const requeueOnError = String(process.env.REQUEUE_ON_ERROR || "true").toLowerCase() === "true"; const requeueOnError = String(process.env.REQUEUE_ON_ERROR || "true").toLowerCase() === "true";
// Гарантируем наличие таблицы перед стартом консьюмера.
await ensureTable(table); await ensureTable(table);
let backoffMs = 2000; let backoffMs = 2000;
@ -206,6 +218,7 @@ async function consumeLoop() {
setStatus("running", ""); setStatus("running", "");
// Обрабатываем сообщения и фиксируем успех/ошибки.
channel.consume(queueName, async (msg) => { channel.consume(queueName, async (msg) => {
if (!msg) { if (!msg) {
return; return;