added a general GET endpoint to route data requests to eerie cloud

README.md

-# api-gateway
-
-
-
-## Getting started
-
-To make it easy for you to get started with GitLab, here's a list of recommended next steps.
-
-Already a pro? Just edit this README.md and make it your own. Want to make it easy? [Use the template at the bottom](#editing-this-readme)!
-
-## Add your files
-
-- [ ] [Create](https://docs.gitlab.com/ee/user/project/repository/web_editor.html#create-a-file) or [upload](https://docs.gitlab.com/ee/user/project/repository/web_editor.html#upload-a-file) files
-- [ ] [Add files using the command line](https://docs.gitlab.com/ee/gitlab-basics/add-file.html#add-a-file-using-the-command-line) or push an existing Git repository with the following command:
-
-```
-cd existing_repo
-git remote add origin https://gitlab.dkrz.de/ww-easier-data-access/api-gateway.git
-git branch -M main
-git push -uf origin main
-```
-
-## Integrate with your tools
-
-- [ ] [Set up project integrations](https://gitlab.dkrz.de/ww-easier-data-access/api-gateway/-/settings/integrations)
-
-## Collaborate with your team
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-## Test and Deploy
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-
-***
-
-# Editing this README
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package.json

+{
+  "name": "api-gateway",
+  "version": "0.1.0",
+  "description": "Front end API gateway server to route the request for ESM data to different sources (DKRZ, Jülich, etc).",
+  "main": "src/server.js",
+  "scripts": {
+    "start": "nodemon --ext js --exec node src/server.js",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://gitlab.dkrz.de/ww-easier-data-access/api-gateway"
+  },
+  "keywords": [
+    "esm-front-end-server",
+    "esm-data-access"
+  ],
+  "author": "WarmWorld Project Partners",
+  "license": "MIT",
+  "dependencies": {
+    "@hapi/hapi": "^21.3.12",
+    "axios": "^1.8.1",
+    "node-cache": "^5.1.2"
+  },
+  "type": "module",
+  "devDependencies": {
+    "nodemon": "^3.1.9"
+  }
+}

src/server.js

+import Hapi from '@hapi/hapi';
+import axios from 'axios';
+import NodeCache from 'node-cache';
+
+const cache = new NodeCache({ stdTTL: 100, checkperiod: 120 });
+
+const DKRZ_SERVER_EERIE = "https://eerie.cloud.dkrz.de/datasets/"
+
+const getBackend = async (home, project, dataset) => {
+    if (home === 'dkrz') {
+      if (project !== 'eerie'){
+        throw new Error("Only Eerie datasets are supported for now.")
+      }
+
+      const url = DKRZ_SERVER_EERIE + `${dataset}/`;
+      const cachedResponse = cache.get(url);
+      if (cachedResponse) return cachedResponse;
+      
+      const response = await axios.get(url);
+      cache.set(url, response.data);
+      return response.data;
+  }
+  throw new Error("DKRZ is the only implemented source currently.");
+};
+
+const datasetHandler = async (request, h) => {
+    try {
+        const { home, project, dataset } = request.params;
+        const backend_response = await getBackend(home, project, dataset);
+        
+        return h.response(backend_response).code(200);
+    } catch (err) {
+        console.error('Error fetching dataset:', err.message);
+        return h.response({ error: 'Something went wrong' }).code(500);
+    }
+};
+
+const init = async () => {
+    const server = Hapi.server({ port: 3000, host: '0.0.0.0' });
+
+    server.route({
+        method: 'GET',
+        path: '/{home}/{project}/{dataset}/{key*}',
+        handler: datasetHandler,
+    });
+
+    await server.start();
+    console.log(`Server running on ${server.info.uri}`);
+};
+
+process.on('unhandledRejection', (err) => {
+    console.error(err);
+    process.exit(1);
+});
+
+init();