feat(functions): add node terraform example (#91)

* feat: add node terraform example

* fix: add to main README

* fix: typo in worthwhile

* docs: grammar

Co-authored-by: Emilie BOUIN <48752456+Bemilie@users.noreply.github.com>

---------

Co-authored-by: Emilie BOUIN <48752456+Bemilie@users.noreply.github.com>

Author: cyclimse

README.md

@@ -18,7 +18,7 @@ Table of Contents:
   - [Examples](#examples)
     - [🚀 Functions](#-functions)
     - [📦 Containers](#-containers)
-    - [⚙️ Jobs](#-jobs)
+    - [⚙️ Jobs](#️-jobs)
     - [💬 Messaging and Queueing](#-messaging-and-queueing)
     - [💜 Projects](#-projects)
   - [Contributing](#contributing)
@@ -41,6 +41,7 @@ Table of Contents:
 | **[Go MultiPart Upload to S3](functions/go-upload-file-s3-multipart)** <br/> A function to upload file from form-data to S3.                                                          | go120     | [Serverless Framework] |
 | **[Image Transform](functions/image-transform-node/README.md)** <br/> A function that resizes images from an S3 bucket.                                                               | node22    | [Serverless Framework] |
 | **[Image Transform with triggers](functions/trigger-image-transform-node/README.md)** <br/> A function that resizes images from an S3 bucket and use SQS triggers to smooth traffic.  | node20    | [Serverless Framework] |
+| **[Node Terraform](functions/node-terraform/README.md)** <br/> A simple example of deploying a Node Serverless function using Terraform.                                              | node22    | [Terraform]            |
 | **[Node MultiPart Upload to S3](functions/node-upload-file-s3-multipart/README.md)** <br/> A function to upload file from form-data to S3.                                            | node19    | [Serverless Framework] |
 | **[PHP write to S3](functions/php-s3/README.md)** <br/> A PHP function that connects to, and writes to an S3 bucket.                                                                  | php82     | [Terraform]            |
 | **[PostgeSQL Node](functions/postgre-sql-node/README.md)** <br/> A Node function to connect and interact with PostgreSQL database.                                                    | node18    | [Serverless Framework] |

functions/node-terraform/.gitignore

@@ -0,0 +1,2 @@
+# Artifacts
+files/

functions/node-terraform/README.md

@@ -0,0 +1,40 @@
+# Node Terraform
+
+An example deploying a Node Serverless function using Terraform. The function is a simple `rss` feed that filters the content of a source feed and returns the filtered content.
+
+## Requirements
+
+- [Node.js](https://nodejs.org/en/download/)
+- [Terraform](https://learn.hashicorp.com/terraform/getting-started/install.html)
+- A configured Scaleway Profile. You can find more information [here](https://www.scaleway.com/en/docs/developer-tools/terraform/reference-content/scaleway-configuration-file/#how-to-set-up-the-configuration-file)
+
+## Usage
+
+Run the function locally:
+
+```bash
+cd function
+npm install --include=dev
+npm start
+```
+
+In another terminal, you can the following command to test the function:
+
+```bash
+curl http://localhost:8081
+```
+
+Deploy the function using Terraform:
+
+```bash
+terraform init
+terraform apply
+```
+
+The function is a `rss` feed that can be accessed via a RSS reader. The URL of the feed is displayed in the output of the Terraform apply command.
+
+## Cleanup
+
+```bash
+terraform destroy
+```

functions/node-terraform/function/index.js

@@ -0,0 +1,63 @@
+import Parser from "rss-parser";
+import RSS from "rss";
+
+const parser = new Parser({
+    headers: { "User-Agent": "Scaleway Serverless Examples" },
+});
+const SOURCE_FEED_URL = process.env.SOURCE_FEED_URL || "https://lobste.rs/rss";
+const WORTHWHILE_TOPICS = process.env.WORTHWHILE_TOPICS ||
+    "nixos, nix, serverless, terraform";
+
+const feed = new RSS({
+    title: `Worthwhile items from ${SOURCE_FEED_URL}`,
+    description: `All about ${WORTHWHILE_TOPICS}`,
+    language: "en",
+    ttl: "60",
+});
+
+// This is a simple function that given an RSS feed,
+// filters out the items that contain any of the topics in the WORTHWHILE_TOPICS environment variable.
+// It then exposes a RSS feed on its own, with the filtered items.
+async function handler(event, _context, _cb) {
+    const userAgent = event.headers["User-Agent"];
+    const ip = event.headers["X-Forwarded-For"].split(",")[0];
+    console.log("Got request from %s with user agent %s", ip, userAgent);
+
+    const topics = WORTHWHILE_TOPICS.split(",").map((t) => t.trim());
+
+    const sourceFeed = await parser.parseURL(SOURCE_FEED_URL);
+    console.log("Parsing feed: %s", feed.title);
+
+    const worthwhileItems = sourceFeed.items.filter((item) => {
+        // Filter out items that don't contain any of the topics
+        return topics.some((topic) => item.title.toLowerCase().includes(topic));
+    });
+
+    console.log("Found %d worthwhile items", worthwhileItems.length);
+
+    worthwhileItems.forEach((item) => {
+        // Shamelessly repost the items
+        feed.item({
+            title: item.title,
+            description: item.content,
+            url: item.link,
+            date: item.pubDate,
+        });
+    });
+
+    return {
+        statusCode: 200,
+        headers: {
+            "Content-Type": "application/xml",
+        },
+        body: feed.xml(),
+    };
+}
+
+export { handler };
+
+if (process.env.NODE_ENV === "development") {
+    import("@scaleway/serverless-functions").then((nodeOffline) => {
+        nodeOffline.serveHandler(handler, 8081);
+    });
+}