Introdução ao Deno 2.0 e MongoDB

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const PORT = 3000;
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async function handler(req: Request): Promise<Response> {
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  const url = new URL(req.url);
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  const path = url.pathname;
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  if (req.method === "GET" && path === "/") {
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    return new Response("Hello, World!");
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  } else if (req.method === "POST" && path === "/api/todos") {
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    // Handle POST /api/todos
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  } else if (req.method === "GET" && path === "/api/todos") {
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    // Handle GET /api/todos
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  } else if (req.method === "GET" && path === "/api/todos/incomplete/count") {
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    // Handle GET /api/todos/incomplete/count
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  } else if (req.method === "GET" && path.startsWith("/api/todos/")) {
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    // Handle GET /api/todos/:id
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  } else if (req.method === "PUT" && path.startsWith("/api/todos/")) {
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    // Handle PUT /api/todos/:id
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  } else if (req.method === "DELETE" && path.startsWith("/api/todos/")) {
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    // Handle DELETE /api/todos/:id
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  } else {
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    return new Response("Not Found", { status: 404 });
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  }
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}
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console.log(`HTTP webserver running. Access it at: http://localhost:${PORT}/`);
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Deno.serve({ port: PORT }, handler);

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deno run --allow-env --allow-read --allow-net --allow-sys --env --watch server.ts

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deno -ERNS --env --watch server.ts

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import { MongoClient } from "npm:mongodb@5.6.0";
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const MONGODB_URI = Deno.env.get("MONGODB_URI") || "";
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const DB_NAME = Deno.env.get("DB_NAME") || "todo_db";
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if (!MONGODB_URI) {
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  console.error("MONGODB_URI is not set");
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  Deno.exit(1);
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}
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const client = new MongoClient(MONGODB_URI);
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try {
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  await client.connect();
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  await client.db("admin").command({ ping: 1 });
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  console.log("Connected to MongoDB");
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} catch (error) {
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  console.error("Error connecting to MongoDB:", error);
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  Deno.exit(1);
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}
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const db = client.db(DB_NAME);
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const todos = db.collection("todos");
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export { db, todos };

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MONGODB_URI="...your connection string..."
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DB_NAME="todo_db"

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import { todos } from "../db.ts";
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import { ObjectId } from "npm:mongodb@5.6.0";

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// ... imports
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async function addTodo(req: Request): Promise<Response> {
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  try {
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    const body = await req.json();
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    const result = await todos.insertOne(body);
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    return new Response(JSON.stringify({ id: result.insertedId }), {
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      status: 201,
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      headers: { "Content-Type": "application/json" },
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    });
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  } catch (error) {
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    return new Response(JSON.stringify({ error: error.message }), {
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      status: 400,
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      headers: { "Content-Type": "application/json" },
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    });
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  }
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}
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export { addTodo };

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import { addTodo } from "./controllers/todoController.ts";
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// ... existing code
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async function handler(req: Request): Promise<Response> {
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  // ... existing code
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  else if (req.method === "POST" && path === "/api/todos") {
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    return await addTodo(req);
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  }
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  // ... existing code
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}

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curl -X POST http://localhost:3000/api/todos -H "Content-Type: application/json" -d '{"title": "Todo 1", "complete": false}'

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// ... existing code
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async function getTodos(): Promise<Response> {
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  try {
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    const allTodos = await todos.find().toArray();
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    return new Response(JSON.stringify(allTodos), {
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      headers: { "Content-Type": "application/json" },
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    });
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  } catch (error) {
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    return new Response(JSON.stringify({ error: error.message }), {
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      status: 500,
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      headers: { "Content-Type": "application/json" },
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    });
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  }
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}
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export { addTodo, getTodos };

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import { addTodo, getTodos } from "./controllers/todoController.ts";
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// ... existing code
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async function handler(req: Request): Promise<Response> {
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  // ... existing code
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  else if (req.method === "GET" && path === "/api/todos") {
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    return await getTodos();
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  }
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  // ... existing code
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}

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curl http://localhost:3000/api/todos

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// ... existing code
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async function getTodo(id: string): Promise<Response> {
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  try {
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    const todo = await todos.findOne({ _id: new ObjectId(id) });
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    if (!todo) {
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      return new Response(JSON.stringify({ error: "Todo not found" }), {
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        status: 404,
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        headers: { "Content-Type": "application/json" },
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      });
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    }
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    return new Response(JSON.stringify(todo), {
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      headers: { "Content-Type": "application/json" },
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    });
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  } catch (error) {
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    return new Response(JSON.stringify({ error: error.message }), {
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      status: 500,
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      headers: { "Content-Type": "application/json" },
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    });
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  }
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}
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export { addTodo, getTodos, getTodo };

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import { addTodo, getTodos, getTodo } from "./controllers/todoController.ts";
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// ... existing code
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async function handler(req: Request): Promise<Response> {
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  // ... existing code
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  else if (req.method === "GET" && path.startsWith("/api/todos/")) {
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    const id = path.split("/")[3];
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    return await getTodo(id);
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  }
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  // ... existing code
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}

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curl http://localhost:3000/api/todos/<...id here...>
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# example: 
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# curl http://localhost:3000/api/todos/67005eef3bf67a631efc95f6

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// ... existing code
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async function updateTodo(id: string, req: Request): Promise<Response> {
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  try {
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    const body = await req.json();
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    const result = await todos.updateOne(
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      { _id: new ObjectId(id) },
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      { $set: body },
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    );
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    if (result.matchedCount === 0) {
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      return new Response(JSON.stringify({ error: "Todo not found" }), {
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        status: 404,
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        headers: { "Content-Type": "application/json" },
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      });
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    }
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    return new Response(JSON.stringify({ updated: result.modifiedCount }), {
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      headers: { "Content-Type": "application/json" },
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    });
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  } catch (error) {
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    return new Response(JSON.stringify({ error: error.message }), {
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      status: 400,
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      headers: { "Content-Type": "application/json" },
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    });
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  }
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}
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export { addTodo, getTodos, getTodo, updateTodo };

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import { addTodo, getTodos, getTodo, updateTodo } from "./controllers/todoController.ts";
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// ... existing code
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async function handler(req: Request): Promise<Response> {
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  // ... existing code
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  else if (req.method === "PUT" && path.startsWith("/api/todos/")) {
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    const id = path.split("/")[3];
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    return await updateTodo(id, req);
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  }
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  // ... existing code
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}

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curl -X PUT http://localhost:3000/api/todos/<...id here...> -H "Content-Type: application/json" -d '{"title": "Updated Todo", "complete": true}'

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// ... existing code
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async function deleteTodo(id: string): Promise<Response> {
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  try {
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    const result = await todos.deleteOne({ _id: new ObjectId(id) });
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    if (result.deletedCount === 0) {
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      return new Response(JSON.stringify({ error: "Todo not found" }), {
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        status: 404,
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        headers: { "Content-Type": "application/json" },
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      });
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    }
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    return new Response(JSON.stringify({ deleted: result.deletedCount }), {
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      status: 200,
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      headers: { "Content-Type": "application/json" },
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    });
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  } catch (error) {
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    return new Response(JSON.stringify({ error: error.message }), {
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      status: 400,
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      headers: { "Content-Type": "application/json" },
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    });
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  }
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}
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export { addTodo, getTodos, getTodo, updateTodo, deleteTodo };

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import { addTodo, getTodos, getTodo, updateTodo, deleteTodo } from "./controllers/todoController.ts";
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// ... existing code
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async function handler(req: Request): Promise<Response> {
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  // ... existing code
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  else if (req.method === "DELETE" && path.startsWith("/api/todos/")) {
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    const id = path.split("/")[3];
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    return await deleteTodo(id);
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  }
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  // ... existing code
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}

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curl -X DELETE http://localhost:3000/api/todos/<...id here...>

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// ... existing code
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async function getIncompleteTodos(): Promise<Response> {
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  try {
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    const pipeline = [
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      { $match: { complete: false } },
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      { $count: "incomplete" },
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    ];
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    const result = await todos.aggregate(pipeline).toArray();
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    const incompleteCount = result[0]?.incomplete || 0;
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    return new Response(JSON.stringify({ incompleteCount }), {
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      headers: { "Content-Type": "application/json" },
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    });
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  } catch (error) {
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    return new Response(JSON.stringify({ error: error.message }), {
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      status: 500,
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      headers: { "Content-Type": "application/json" },
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    });
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  }
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}
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export { addTodo, deleteTodo, getIncompleteTodos, getTodo, getTodos, updateTodo };

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import { addTodo, deleteTodo, getTodo, getTodos, updateTodo, getIncompleteTodos } from "./controllers/todoController.ts";
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// ... existing code
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async function handler(req: Request): Promise<Response> {
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  // ... existing code
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  else if (req.method === "GET" && path === "/api/todos/incomplete/count") {
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    return await getIncompleteTodos();
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  }
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  // ... existing code
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}

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curl http://localhost:3000/api/todos/incomplete/count