fix: Retry and Reconnect system in rabbitmq integration

src/api/integrations/rabbitmq/libs/amqp.server.ts

@@ -6,38 +6,121 @@ import { Logger } from '../../../../config/logger.config';
 const logger = new Logger('AMQP');
 
 let amqpChannel: amqp.Channel | null = null;
+let amqpConnection: amqp.Connection | null = null;
+let reconnectAttempts = 0;
+const maxReconnectAttempts = 10;
+const reconnectInterval = 5000; // 5 segundos
+
+type ResolveCallback = () => void;
+type RejectCallback = (error: Error) => void;
 
 export const initAMQP = () => {
   return new Promise<void>((resolve, reject) => {
-    const uri = configService.get<Rabbitmq>('RABBITMQ').URI;
+    connectToRabbitMQ(resolve, reject);
-    amqp.connect(uri, (error, connection) => {
-      if (error) {
-        reject(error);
-        return;
-      }
-
-      connection.createChannel((channelError, channel) => {
-        if (channelError) {
-          reject(channelError);
-          return;
-        }
-
-        const exchangeName = 'evolution_exchange';
-
-        channel.assertExchange(exchangeName, 'topic', {
-          durable: true,
-          autoDelete: false,
-        });
-
-        amqpChannel = channel;
-
-        logger.info('AMQP initialized');
-        resolve();
-      });
-    });
   });
 };
 
+const connectToRabbitMQ = (resolve?: ResolveCallback, reject?: RejectCallback) => {
+  const uri = configService.get<Rabbitmq>('RABBITMQ').URI;
+  amqp.connect(uri, (error, connection) => {
+    if (error) {
+      logger.error(`Failed to connect to RabbitMQ: ${error.message}`);
+      handleConnectionError(error, resolve, reject);
+      return;
+    }
+
+    reconnectAttempts = 0;
+    amqpConnection = connection;
+
+    connection.on('error', (err) => {
+      logger.error(`RabbitMQ connection error: ${err.message}`);
+      scheduleReconnect();
+    });
+
+    connection.on('close', () => {
+      logger.warn('RabbitMQ connection closed unexpectedly');
+      scheduleReconnect();
+    });
+
+    createChannel(connection, resolve, reject);
+  });
+};
+
+const createChannel = (connection: amqp.Connection, resolve?: ResolveCallback, reject?: RejectCallback) => {
+  connection.createChannel((channelError, channel) => {
+    if (channelError) {
+      logger.error(`Failed to create channel: ${channelError.message}`);
+      if (reject) {
+        reject(channelError);
+      }
+      return;
+    }
+
+    const exchangeName = 'evolution_exchange';
+
+    channel.assertExchange(exchangeName, 'topic', {
+      durable: true,
+      autoDelete: false,
+    });
+
+    channel.on('error', (err) => {
+      logger.error(`RabbitMQ channel error: ${err.message}`);
+      amqpChannel = null;
+      createChannel(connection);
+    });
+
+    channel.on('close', () => {
+      logger.warn('RabbitMQ channel closed');
+      amqpChannel = null;
+      createChannel(connection);
+    });
+
+    amqpChannel = channel;
+
+    logger.info('AMQP initialized');
+    if (resolve) {
+      resolve();
+    }
+  });
+};
+
+const scheduleReconnect = () => {
+  if (reconnectAttempts >= maxReconnectAttempts) {
+    logger.error(`Exceeded maximum ${maxReconnectAttempts} reconnection attempts to RabbitMQ`);
+    return;
+  }
+
+  amqpChannel = null;
+
+  if (amqpConnection) {
+    try {
+      amqpConnection.close();
+    } catch (err) {
+      // Ignora erro ao fechar conexão que já pode estar fechada
+    }
+    amqpConnection = null;
+  }
+
+  reconnectAttempts++;
+  const delay = reconnectInterval * Math.pow(1.5, reconnectAttempts - 1); // Backoff exponencial
+
+  logger.info(`Reconnection attempt ${reconnectAttempts} to RabbitMQ in ${delay}ms`);
+
+  setTimeout(() => {
+    connectToRabbitMQ();
+  }, delay);
+};
+
+const handleConnectionError = (error: Error, resolve?: ResolveCallback, reject?: RejectCallback) => {
+  if (reject && reconnectAttempts === 0) {
+    // Na inicialização, rejeitar a Promise se for a primeira tentativa
+    reject(error);
+    return;
+  }
+
+  scheduleReconnect();
+};
+
 export const getAMQP = (): amqp.Channel | null => {
   return amqpChannel;
 };
@@ -55,7 +138,9 @@ export const initGlobalQueues = () => {
   const eventKeys = Object.keys(events);
 
   eventKeys.forEach((event) => {
-    if (events[event] === false) return;
+    if (events[event] === false) {
+      return;
+    }
 
     const queueName =
       prefixKey !== ''
@@ -83,7 +168,9 @@ export const initGlobalQueues = () => {
 };
 
 export const initQueues = (instanceName: string, events: string[]) => {
-  if (!events || !events.length) return;
+  if (!events || !events.length) {
+    return;
+  }
 
   const queues = events.map((event) => {
     return `${event.replace(/_/g, '.').toLowerCase()}`;
@@ -113,7 +200,9 @@ export const initQueues = (instanceName: string, events: string[]) => {
 };
 
 export const removeQueues = (instanceName: string, events: string[]) => {
-  if (!events || !events.length) return;
+  if (!events || !events.length) {
+    return;
+  }
 
   const channel = getAMQP();