primer cambio

node_modules/amqplib/examples/stream_queues/README.md

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+RabbitMQ Stream Examples 
+---
+The [stream queues](https://www.rabbitmq.com/streams.html) are available starting from RabbitMQ 3.9
+
+These examples show how to use stream queues with the lib.
+
+Send a message to a stream queue
+```
+node send_stream.js
+```
+
+Receive all the messages from stream queue:
+```
+node receive_stream.js
+```
+
+Consumers can be configured to receive messages using an offset via the `x-stream-offset` argument. e.g.
+
+```js
+channel.consume(queue, onMessage, {
+  noAck: false,
+  arguments: {
+    'x-stream-offset': 'first'
+  }
+});
+```
+
+RabbitMQ supports six different types of offset, however specifying them can be
+
+| Offset Type | Example Value                                          | Notes |
+|-----------|----------------------------------------------------------|-------|
+| First     | `{'x-stream-offset':'first'}`                            | Start from the first message in the log |
+| Last      | `{'x-stream-offset':'last'}`                             | Start from the last "chunk" of messages (could be multiple messages) |
+| Next      | `{'x-stream-offset':'next'}`                             | Start from the next message (the default) |
+| Offset    | `{'x-stream-offset':5}`                                  | a numerical value specifying an exact offset to attach to the log at |
+| Timestamp | `{'x-stream-offset':{'!':'timestamp',value:1686519750}}` | a timestamp value specifying the point in time to attach to the log at. The timestamp must be the number of seconds since 00:00:00 UTC, 1970-01-01. Consumers can receive messages published a bit before the specified timestamp. |
+| Interval  | `{'x-stream-offset':'1h'}`                               | the time interval relative to current time to attach the log at. Valid units are Y, M, D, h, m and s |
+
+
+See https://www.rabbitmq.com/streams.html#consuming for more details

node_modules/amqplib/examples/stream_queues/package.json

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+{
+  "name": "stream_queues",
+  "version": "1.0.0",
+  "description": "An example demonstrating use of stream queues",
+  "main": "n",
+  "dependencies": {
+    "amqplib": "^0.10.3"
+  },
+  "devDependencies": {},
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "license": "ISC"
+}

node_modules/amqplib/examples/stream_queues/receive_stream.js

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+const amqp = require('amqplib');
+
+(async () => {
+    try {
+        const connection = await amqp.connect('amqp://localhost');
+        process.once('SIGINT', connection.close);
+
+        const channel = await connection.createChannel();
+        const queue = 'my_first_stream';
+
+        // Define the queue stream
+        // Mandatory: exclusive: false, durable: true  autoDelete: false
+        await channel.assertQueue(queue, {
+            exclusive: false,
+            durable: true,
+            autoDelete: false,
+            arguments: {
+                'x-queue-type': 'stream',  // Mandatory to define stream queue
+                'x-max-length-bytes': 2_000_000_000  // Set the queue retention to 2GB else the stream doesn't have any limit
+            }
+        });
+
+        channel.qos(100);  // This is mandatory
+
+        channel.consume(queue, (msg) => {
+            console.log(" [x] Received '%s'", msg.content.toString());
+            channel.ack(msg);  // Mandatory
+        }, {
+            noAck: false,
+            arguments: {
+                /*
+                    Here you can specify the offset: : first, last, next, offset, timestamp and interval, i.e.
+
+                    'x-stream-offset': 'first'
+                    'x-stream-offset': 'last'
+                    'x-stream-offset': 'next'
+                    'x-stream-offset': 5
+                    'x-stream-offset': { '!': 'timestamp', value: 1686519750 }
+                    'x-stream-offset': '1h'
+
+                    The timestamp must be the desired number of seconds since 00:00:00 UTC, 1970-01-01
+                    The interval units can be Y, M, D, h, m, s
+
+                */
+                'x-stream-offset': 'first'
+            }
+        });
+
+        console.log(' [*] Waiting for messages. To exit press CTRL+C');
+    }
+    // Catch and display any errors in the console
+    catch(e) {
+        console.log(e)
+    }
+})();

node_modules/amqplib/examples/stream_queues/send_stream.js

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+const amqp = require('amqplib');
+
+
+(async () => {
+    try {
+        const connection = await amqp.connect('amqp://localhost');
+        process.once('SIGINT', connection.close);
+
+        const channel = await connection.createChannel();
+        const queue = 'my_first_stream';
+        const msg = `Hello World! ${Date.now()}`;
+
+        // Define the queue stream
+        // Mandatory: exclusive: false, durable: true  autoDelete: false
+        await channel.assertQueue(queue, {
+            exclusive: false,
+            durable: true,
+            autoDelete: false,
+            arguments: {
+                'x-queue-type': 'stream',  // Mandatory to define stream queue
+                'x-max-length-bytes': 2_000_000_000  // Set the queue retention to 2GB else the stream doesn't have any limit
+            }
+        });
+
+        // Send the message to the stream queue
+        await channel.sendToQueue(queue, Buffer.from(msg));
+        console.log(" [x] Sent '%s'", msg);
+        await channel.close();
+
+        // Close connection
+        connection.close();
+    }
+    // Catch and display any errors in the console
+    catch(e) {
+        console.log(e)
+    }
+})();
+