migrate backend to google cloud run & AI to Gemini

.gitignore

@@ -1,3 +1,5 @@
+**.env
+
 # Logs
 logs
 *.log

api-express/.dockerignore

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+# Include any files or directories that you don't want to be copied to your
+# container here (e.g., local build artifacts, temporary files, etc.).
+#
+# For more help, visit the .dockerignore file reference guide at
+# https://docs.docker.com/go/build-context-dockerignore/
+
+**/.classpath
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/.next
+**/.cache
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/charts
+**/docker-compose*
+**/compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+**/build
+**/dist
+LICENSE
+README.md

api-express/Dockerfile

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+FROM node:20.10.0
+
+WORKDIR /app
+
+COPY package*.json ./
+
+RUN npm install
+
+COPY . .
+
+EXPOSE 8080
+
+CMD ["npm", "start"] 

api-express/README.Docker.md

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+### Building and running your application
+
+When you're ready, start your application by running:
+`docker compose up --build`.
+
+Your application will be available at http://localhost:4000.
+
+### Deploying your application to the cloud
+
+First, build your image, e.g.: `docker build -t myapp .`.
+If your cloud uses a different CPU architecture than your development
+machine (e.g., you are on a Mac M1 and your cloud provider is amd64),
+you'll want to build the image for that platform, e.g.:
+`docker build --platform=linux/amd64 -t myapp .`.
+
+Then, push it to your registry, e.g. `docker push myregistry.com/myapp`.
+
+Consult Docker's [getting started](https://docs.docker.com/go/get-started-sharing/)
+docs for more detail on building and pushing.
+
+### References
+* [Docker's Node.js guide](https://docs.docker.com/language/nodejs/)

api-express/compose.yaml

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+# Comments are provided throughout this file to help you get started.
+# If you need more help, visit the Docker Compose reference guide at
+# https://docs.docker.com/go/compose-spec-reference/
+
+# Here the instructions define your application as a service called "server".
+# This service is built from the Dockerfile in the current directory.
+# You can add other services your application may depend on here, such as a
+# database or a cache. For examples, see the Awesome Compose repository:
+# https://github.com/docker/awesome-compose
+services:
+  server:
+    build:
+      context: .
+    environment:
+      NODE_ENV: production
+    ports:
+      - 4000:4000
+
+# The commented out section below is an example of how to define a PostgreSQL
+# database that your application can use. `depends_on` tells Docker Compose to
+# start the database before your application. The `db-data` volume persists the
+# database data between container restarts. The `db-password` secret is used
+# to set the database password. You must create `db/password.txt` and add
+# a password of your choosing to it before running `docker-compose up`.
+#     depends_on:
+#       db:
+#         condition: service_healthy
+#   db:
+#     image: postgres
+#     restart: always
+#     user: postgres
+#     secrets:
+#       - db-password
+#     volumes:
+#       - db-data:/var/lib/postgresql/data
+#     environment:
+#       - POSTGRES_DB=example
+#       - POSTGRES_PASSWORD_FILE=/run/secrets/db-password
+#     expose:
+#       - 5432
+#     healthcheck:
+#       test: [ "CMD", "pg_isready" ]
+#       interval: 10s
+#       timeout: 5s
+#       retries: 5
+# volumes:
+#   db-data:
+# secrets:
+#   db-password:
+#     file: db/password.txt
+

api-express/index.js

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+const express = require("express");
+const cors = require("cors");
+const { GoogleGenerativeAI } = require("@google/generative-ai");
+const genAI = new GoogleGenerativeAI(process.env.GEMINI_API_KEY);
+
+// Import the rate-limiting middleware.
+const rateLimit = require('express-rate-limit')
+
+
+const limiter = rateLimit({
+	windowMs: 15 * 60 * 1000, // 15 minutes
+	limit: 100, // Limit each IP to 100 requests per `window` (here, per 15 minutes).
+	standardHeaders: 'draft-7', // draft-6: `RateLimit-*` headers; draft-7: combined `RateLimit` header
+	legacyHeaders: false, // Disable the `X-RateLimit-*` headers.
+	// store: ... , // Redis, Memcached, etc. See below.
+})
+
+//
+const app = express();
+app.use(limiter)
+app.use(cors());
+app.use(express.json());
+
+app.get("/", (req, res) => {
+  res.status(200).send("hello world!");
+});
+
+app.post("/api/chat", async (req, res) => {
+  if (!req.body || !req.body.message) {
+    return res.status(400).json({ message: "No message provided" });
+  }
+  const { message, history = [] } = req.body;
+
+  const model = genAI.getGenerativeModel({ model: "gemini-pro" });
+  console.log(JSON.stringify(history));
+  const chat = model.startChat({
+    history: history.map((msg) => ({
+      role: msg.role === "user" ? "user" : "model",
+      parts: [{ text: msg.text || "" }],
+    })),
+  });
+
+  //   console.log(msg);
+  const result = await chat.sendMessage(message);
+  const response = await result.response;
+  const text = response.text();
+  console.log(text);
+  res.json({ message: text });
+});
+
+// Handle 404
+app.use(function (request, response) {
+  response.status(404).json({ message: "Undefined API routes" });
+});
+
+const listener = app.listen(process.env.PORT || 4000, function () {
+  console.log("Your app is listening on port " + listener.address().port);
+});