Hello World for nodejs stream client (#403)

* add: simple publish/receive examples for the nodejs stream client

Author: icappello

javascript-nodejs-stream/.gitignore

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+/node_modules

javascript-nodejs-stream/README.md

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+# Node.js code for RabbitMQ stream tutorials
+
+Here you can find JavaScript (Node) code examples from [RabbitMQ tutorials](https://www.rabbitmq.com/getstarted.html) related to the [Stream plugin](https://www.rabbitmq.com/docs/stream).
+
+To successfully use the examples you will need a running RabbitMQ server.
+
+## Requirements
+
+Apart from [Node.js](https://nodejs.org/en/download/), these examples use the [`rabbitmq-stream-js-client`](https://github.com/coders51/rabbitmq-stream-js-client) client library.
+
+## Code
+
+Code examples are executed via `npm`:
+
+    npm run publish
+    npm run receive
+
+To learn more, see [`coders51/rabbitmq-stream-js-client`](https://github.com/coders51/rabbitmq-stream-js-client).

javascript-nodejs-stream/package-lock.json

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+{
+  "name": "rabbitmq-stream-node-tutorial",
+  "version": "1.0.0",
+  "description": "Tutorial for the nodejs RabbitMQ stream client",
+  "scripts": {
+    "send": "node send.js",
+    "receive": "node receive.js"
+  },
+  "dependencies": {
+    "rabbitmq-stream-js-client": "^0.3.1"
+  }
+}

javascript-nodejs-stream/package.json

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+const rabbit = require("rabbitmq-stream-js-client")
+
+async function main() {
+    const streamName = "hello-nodejs-stream"
+
+    console.log("Connecting...");
+    const client = await rabbit.connect({
+        hostname: "localhost",
+        port: 5552,
+        username: "guest",
+        password: "guest",
+        vhost: "/",
+    })
+
+    console.log("Making sure the stream exists...");
+    const streamSizeRetention = 5 * 1e9
+    await client.createStream({ stream: streamName, arguments: { "max-length-bytes": streamSizeRetention } });
+
+    console.log("Declaring the consumer with offset...");
+    await client.declareConsumer({ stream: streamName, offset: rabbit.Offset.first() }, (message) => {
+        console.log(`Received message ${message.content.toString()}`)
+    })
+
+}
+
+main()
+    .then(async () => {
+        await new Promise(function () { })
+    })
+    .catch((res) => {
+        console.log("Error while receiving message!", res)
+        process.exit(-1)
+    })

javascript-nodejs-stream/receive.js

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+const rabbit = require("rabbitmq-stream-js-client");
+
+async function main() {
+    const streamName = "hello-nodejs-stream";
+
+    console.log("Connecting...");
+    const client = await rabbit.connect({
+        vhost: "/",
+        port: 5552,
+        hostname: "localhost",
+        username: "guest",
+        password: "guest",
+    });
+
+    console.log("Making sure the stream exists...");
+    const streamSizeRetention = 5 * 1e9
+    await client.createStream({ stream: streamName, arguments: { "max-length-bytes": streamSizeRetention } });
+
+    console.log("Creating the publisher...");
+    const publisher = await client.declarePublisher({ stream: streamName });
+
+    console.log("Sending a message...");
+    await publisher.send(Buffer.from("Test message"));
+
+    console.log("Closing the connection...");
+    await client.close();
+}
+
+main()
+    .then(() => console.log("done!"))
+    .catch((res) => {
+        console.log("Error in publishing message!", res);
+        process.exit(-1);
+    });