From bfd2ae259ba8b8822aec767e46e7f793418a8517 Mon Sep 17 00:00:00 2001 From: Andrej Rasevic <andrej@rasevicengineering.com> Date: Sun, 19 Jan 2025 22:55:08 -0500 Subject: [PATCH] adding Project2 --- Projects/Project2/Project2Description.md | 23 + Projects/Project2/api/v1/contacts.js | 14 + Projects/Project2/db/queries.js | 102 +++ Projects/Project2/docker-compose.yml | 18 + Projects/Project2/index.js | 30 + Projects/Project2/models/contact.js | 0 Projects/Project2/package-lock.json | 806 +++++++++++++++++++++++ Projects/Project2/package.json | 16 + 8 files changed, 1009 insertions(+) create mode 100644 Projects/Project2/Project2Description.md create mode 100644 Projects/Project2/api/v1/contacts.js create mode 100644 Projects/Project2/db/queries.js create mode 100644 Projects/Project2/docker-compose.yml create mode 100644 Projects/Project2/index.js create mode 100644 Projects/Project2/models/contact.js create mode 100644 Projects/Project2/package-lock.json create mode 100644 Projects/Project2/package.json diff --git a/Projects/Project2/Project2Description.md b/Projects/Project2/Project2Description.md new file mode 100644 index 0000000..30cb423 --- /dev/null +++ b/Projects/Project2/Project2Description.md @@ -0,0 +1,23 @@ +# Project 2: REST API with Postgresql + +## Due Date: Wednesday January 22nd 2025, 11:55 PM +## Objectives: To implement a complete REST API with express and Postgresql + +## Specifications/Requirements +In this project you will continue with the work you did in Project 1, the InMemoryAPI. The fundamental difference between the two projects is that in this project you will be storing your contacts in an instance of postgresdb that we provide for you, as opposed to in the memory of the process that the server is running in. What that means is that if you shut down the server and restart it, your data will persist. + +To get going you will need to start docker desktop on your computer. Then once you are inside of the Project2 directory you should execute the following command: +```docker-compose up -d``` + +This will download the postgres image and spin up the container as well as create an instance of the postgres database and user account with admin privileges. + +To start the api, you then just need to execute the following: +```node index.js``` +You will need to complete the function stubs inside of queries.js. To help get you going we completed the getContacts function for you to give you the pattern of what you will need to do in the other functions. To help you with writing the other queries you should use this as a reference: +https://www.w3schools.com/sql and https://www.w3schools.com/postgresql/index.php + +You will also need to define your data model, route handlers and endpoints. + +You will use these queries inside of your route handlers. Your route handlers still need to enforce the same validations of the data as they did in Project 1 and need to do this before the request reaches the database layer. What this means is that in the request - reponse lifecycle, your request will first hit the handler, run any validations, if successful continue towards the database layer and if it fails validations respond to the client with the same messages and status codes as in Project 1. + +__Note: In order to run the application run ```npm install``` and then ```n``` in the top level directory of the project. To test your endpoints you will need the use of an external tool like Postman or the use of the Curl command line utility.__ \ No newline at end of file diff --git a/Projects/Project2/api/v1/contacts.js b/Projects/Project2/api/v1/contacts.js new file mode 100644 index 0000000..49a2604 --- /dev/null +++ b/Projects/Project2/api/v1/contacts.js @@ -0,0 +1,14 @@ +// define your routes and handlers here +// your handlers should invoke the queries you wrote in queries.js +// only if the requests pass the validations +const express = require('express'); +const contactsRouter = express.Router(); +const db = require('./../../db/queries'); +const Contact = require('../../models/contact') + +contactsRouter.route('/contacts') + .post((req, res) => { + db.createContact(req, res) + }) + +module.exports = contactsRouter; \ No newline at end of file diff --git a/Projects/Project2/db/queries.js b/Projects/Project2/db/queries.js new file mode 100644 index 0000000..defaf27 --- /dev/null +++ b/Projects/Project2/db/queries.js @@ -0,0 +1,102 @@ +const Pool = require('pg').Pool +const Contact = require('./../models/contact') + +const pool = new Pool({ + user: 'postgres', + host: 'localhost', + database: 'project2', + password: 'dbpassword', + port: 5432, +}) + +// create the contacts table in the database if not already present +async function createContactsTable() { + try { + const query = ` + CREATE TABLE IF NOT EXISTS contacts ( + id SERIAL PRIMARY KEY, + firstName VARCHAR(255) NOT NULL, + lastName VARCHAR(255) NOT NULL, + phoneNumber VARCHAR(255) NOT NULL, + email VARCHAR(255) NOT NULL + ); + `; + + await pool.query(query); + console.log('Contacts table created'); + } catch (err) { + console.error(err); + console.error('Contacts table creation failed'); + } +} + +// this will return all contacts in ascending order based off of the id +const getContacts = async (request, response) => { + pool.query('SELECT * FROM contacts ORDER BY id ASC', (error, results) => { + if (error) { + console.error(error) + throw error + } + response.status(200).json(results.rows) + }) + } + +// This query will return all contacts that match the filter provided +// by the query parameters +// returns 200 with the matching contacts or a 404 with an appropriate +// error message if none found with an empty array +const filterContacts = async (request, response) => { + +} + + +// This query will return the contact that matches the id in the request param +// returns 200 with the matching contact or a 404 with an appropriate +// error message if none found with an empty array +const getContactById = (request, response) => { + +} + +// creates a new contact in the database and will respond with a 200 status code +// if successful and should fail validations prior to reaching this query +// will respond with a 500 if the databse query fails +const createContact = (request, response) => { + // create instance of Contact "class" and then apply validations on the data + // instacne should be created from the request.body fields + const { firstname, lastname, email, phonenumber } = request.body + + pool.query('INSERT INTO contacts (firstname, lastname, email, phonenumber) VALUES ($1, $2, $3, $4) RETURNING *', + [firstname, lastname, email, phonenumber], (error, results) => { + if (error) { + throw error + } + console.log(results.rows[0]) + console.log(results.fields) + response.status(201).json({result: `User added with ID: ${results.rows[0].id}`}) + }) +} + +// updates an existing contact in the database and will respond with a 200 status code +// if successful and should fail validations prior to reaching this query +// will query for the contact based off of the request param +// will return a 404 if the resource is not found +// will also respond with the updated values for the contact resource +// will respond with a 500 if the databse query fails + +const updateContact = (request, response) => { + +} + + // deletes's contact from db - should first check that the contact exists and if not + // return a 404 with an appropriate error message + // should respond with a 200 and the resource that was deleted if successfully + // removed from the database +const deleteContact = (request, response) => { + +} + +module.exports = { +createContactsTable, +getContacts, +createContact +} \ No newline at end of file diff --git a/Projects/Project2/docker-compose.yml b/Projects/Project2/docker-compose.yml new file mode 100644 index 0000000..a01bc96 --- /dev/null +++ b/Projects/Project2/docker-compose.yml @@ -0,0 +1,18 @@ +version: '3.8' +services: + postgres: + image: postgres:latest + container_name: PostgresCont + restart: always + environment: + POSTGRES_USER: postgres + POSTGRES_PASSWORD: dbpassword + POSTGRES_DB: project2 + ports: + - "5432:5432" + volumes: + - postgres_db:/var/lib/postgresql/data + +volumes: + postgres_db: + driver: local diff --git a/Projects/Project2/index.js b/Projects/Project2/index.js new file mode 100644 index 0000000..cf6e051 --- /dev/null +++ b/Projects/Project2/index.js @@ -0,0 +1,30 @@ +const express = require('express') +const bodyParser = require('body-parser') +const app = express() +const Pool = require('pg').Pool +const contactsRouter = require('./api/v1/contacts') +const db = require('./db/queries') + +const port = 3000 + +app.use(bodyParser.json()) +app.use( + bodyParser.urlencoded({ + extended: true, + }) +) + +db.createContactsTable(); +app.get('/health', (request, response) => { + response.json({ info: 'Project 2 - CMSC388B Winter 2025' }) + }) + +app.get('/api/v1/contacts', (req, res) => { + db.getContacts(req, res) +}) + +app.use('/api/v1', contactsRouter) + +app.listen(port, () => { + console.log(`App running on port ${port}.`) +}) \ No newline at end of file diff --git a/Projects/Project2/models/contact.js b/Projects/Project2/models/contact.js new file mode 100644 index 0000000..e69de29 diff --git a/Projects/Project2/package-lock.json b/Projects/Project2/package-lock.json 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