Low Level Design for Amazon Shopping
Published
•11 min read
P
Hello, I'm Paras Kaushik! 👋 I'm a dedicated software engineer based in India, specializing in C++ and proficient in the MERN stack.
🤝 Interested in collaborating on innovative projects that require my technical expertise.
💬 Passionate about participating in discussions related to software architecture and best practices.
📧 Feel free to reach out to me via email: [paraskaushik12@gmail.com]
🔗 Connect with me on LinkedIn: [https://www.linkedin.com/in/the-paras-kaushik/]
Requirements
User Authentication:
Implement a secure user registration system.
Develop a user login mechanism with proper authentication.
User Profiles:
- Allow users to create and update their profiles.
Product Management:
Enable the creation, deletion, and updating of product information.
Support product retrieval by ID or category.
Implement a search feature to find products based on user queries.
Maintain a comprehensive list of all available products.
Shopping Cart:
Provide users with the ability to create and manage their shopping carts.
Allow users to add, update, and remove items from their carts.
Order Processing:
Develop a system for users to place orders.
Enable users to view their order history.
Implement order status management, including order confirmation, shipping, delivery, and cancellation.
Payment Handling:
Create payment links for order transactions.
Allow users to update their payment information securely.
Product Reviews and Ratings:
Implement a feature for users to create product reviews.
Enable users to rate products.
Display product ratings to users.
Order Tracking:
- Provide users with the ability to view all their orders.
Models Identification
We can see models of the system will include :
Cart
CartItem
Product
User
Address
Reviews
Ratings
Category
Order
Order Item
Service Identification
APIs
| Service API | Description |
| createUser(userData) | Creates a new user with the provided data, including first name, last name, email, password, and role. If a user with the same email already exists, it throws an error. |
| findUserById(userId) | Finds a user by their ID and returns their information. If the user is not found, it throws an error. |
| getUserByEmail(email) | Retrieves a user by their email. If the user is not found, it throws an error. |
| getUserProfileByToken(token) | Retrieves a user's profile using a token, and ensures the user's password is not included in the response. If the user doesn't exist, it throws an error. |
| getAllUsers() | Fetches all users in the system and returns them. If there's an error, it throws an error. |
| createCart(user) | Creates a new cart for a user and returns the created cart. |
| findUserCart(userId) | Finds a user's cart, updates cart details including cart items, and returns the cart. |
| addCartItem(userId, req) | Adds an item to the user's cart based on the provided product information. Returns a confirmation message. |
| createCartItem(cartItemData) | Creates a new cart item with the provided data, including quantity, price, and discounted price, and returns the created cart item. |
| updateCartItem(userId, cartItemId, cartItemData) | Updates an existing cart item with the provided data, such as quantity, price, and discounted price. It ensures that the user can only update their own cart item. |
| isCartItemExist(cart, product, size, userId) | Checks if a cart item already exists in the user's cart based on the provided parameters and returns the cart item if found. |
| removeCartItem(userId, cartItemId) | Removes a cart item from the user's cart. It checks that the user can only remove their own cart item. |
| findCartItemById(cartItemId) | Finds a cart item by its ID and returns its details. If the cart item doesn't exist, it throws a CartItemException. |
| createProduct(reqData) | Creates a new product with the provided data and returns the saved product. |
| deleteProduct(productId) | Deletes a product by its ID. If the product doesn't exist, it throws an error. |
| updateProduct(productId, reqData) | Updates a product's information by its ID and returns the updated product. |
| findProductById(id) | Finds a product by its ID and returns its details. If the product doesn't exist, it throws an error. |
| getAllProducts(reqQuery) | Retrieves a list of products with filtering and pagination options. Returns the product list along with pagination information. |
| createMultipleProduct(products) | Creates multiple products based on the provided data. |
| createOrder(user, shippAddress) | Creates a new order with user and shipping address information, along with order items. |
| placedOrder(orderId) | Updates the order status to "PLACED" and payment status to "COMPLETED" for the given order. |
| confirmedOrder(orderId) | Updates the order status to "CONFIRMED" for the given order. |
| shipOrder(orderId) | Updates the order status to "SHIPPED" for the given order. |
| deliveredOrder(orderId) | Updates the order status to "DELIVERED" for the given order. |
| cancelledOrder(orderId) | Updates the order status to "CANCELLED" for the given order. |
| findOrderById(orderId) | Finds an order by its ID and returns its details. |
| usersOrderHistory(userId) | Retrieves the order history of a user with the "PLACED" status. |
| getAllOrders() | Retrieves all orders with details. |
| deleteOrder(orderId) | Deletes an order by its ID, and if the order doesn't exist, it throws an error. |
| createPaymentLink(orderId) | Creates a payment link for an order, including details such as amount, currency, customer information, and callback URL. Returns the payment link URL and ID. |
| updatePaymentInformation(reqData) | Updates the payment information and order status for a completed payment. Returns a message indicating the order is placed. |
| createReview(reqData, user) | Creates a new review for a product with the provided data, associated with a user and a product. |
| getAllReview(productId) | Retrieves all reviews for a product based on the product's ID. Returns the list of reviews, each associated with a user. |
| createRating(req, user) | Creates a new rating for a product with the provided data, associated with a user and a product. |
| getProductsRating(productId) | Retrieves all ratings for a product based on the product's ID. Returns the list of ratings for the product. |
Processing Requests
| Request | Input | Processing | Output |
| User Registration | User details (name, email, password) | Validate input, create a user, generate a JWT, create a shopping cart | Successful registration - status 200, JWT, and success message. Errors - status 500 and an error message. |
| User Login | User login details (email, password) | Validate input, check user existence, verify password, generate a JWT | Successful login - status 200, JWT, and success message. User not found - status 404 and "User not found" message. Invalid password - status 401 and "Invalid password" message. Errors - status 500 and an error message. |
| Get User Profile | JWT token in the request header | Check for JWT, retrieve user profile using the JWT | Successful profile retrieval - status 200 and user profile data. Token not found - status 404 and "token not found" error message. Errors - status 500 and an error message. |
| Get All Users | None | Retrieve all user profiles using the userService | Successful retrieval - status 200 and a list of user profiles. Errors - status 500 and an error message. |
| Create a Product | Product data in the request body | Create a new product using productService, respond with status 201 and the created product. | In case of an error, respond with status 500 and an error message. |
| Delete a Product by ID | Product ID in the request parameters | Delete a product using productService, respond with a success message. | In case of an error, respond with status 500 and an error message. |
| Update a Product by ID | Product ID in the request parameters, product data in the request body | Update a product using productService, respond with the updated product. | In case of an error, respond with status 500 and an error message. |
| Find a Product by ID | Product ID in the request parameters | Find a product by ID using productService, respond with the product data. | If the product is not found, respond with status 404 and an error message. In case of other errors, respond with status 500 and an error message. |
| Find Products by Category | Category in the request parameters | Find products by category using productService, respond with the list of products. | In case of an error, respond with status 500 and an error message. |
| Search Products by Query | Query in the request parameters | Search products by query using productService, respond with the list of products matching the query. | In case of an error, respond with status 500 and an error message. |
| Get All Products | Query parameters for filtering and pagination | Retrieve products with filtering and pagination, respond with the list of products. | In case of an error, respond with status 500 and an error message. |
| Create Multiple Products | Multiple product data in the request body | Create multiple products using productService, respond with a success message. | In case of an error, respond with status 500 and an error message. |
| Find User Cart | User data from the request (req.user) | Find the user's cart using cartService, respond with status 200 and the user's cart data. | In case of an error, respond with status 500 and an error message. |
| Add Item to Cart | User data from the request (req.user), item data in the request body | Add an item to the user's cart using cartService, respond with status 202 and a success message. | In case of an error, respond with status 500 and an error message. |
| Update Cart Item | User data from the request (req.user), cart item ID in the request parameters, updated item data in the request body | Update a cart item using cartItemService, respond with status 200 and the updated cart item data. | In case of an error, respond with status 500 and an error message. |
| Remove Cart Item | User data from the request (req.user), cart item ID in the request parameters | Remove a cart item using cartItemService, respond with status 200 and a success message. | In case of an error, respond with status 500 and an error message. |
| Create Order | User data from the request (req.user), order data in the request body | Create an order using orderService, respond with status 201 and the created order. | In case of an error, respond with status 500 and an error message. |
| Find Order by ID | User data from the request (req.user), order ID in the request parameters | Find an order by ID using orderService, respond with status 200 and the order data. | In case of an error, respond with status 500 and an error message. |
| Order History | User data from the request (req.user) | Retrieve a user's order history using orderService, respond with status 200 and the order history. | In case of an error, respond with status 500 and an error message. |
| Create Payment Link | Order ID in the request parameters | Create a payment link using paymentService, respond with status 200 and the payment link. | In case of an error, respond with status 500 and an error message. |
| Update Payment Information | Query parameters with payment information | Update payment information using paymentService, respond with status 200 and a success message. | In case of an error, respond with status 500 and an error message. |
| Create Review | User data from the request (req.user), review data in the request body | Create a review using reviewService, respond with status 201 and the created review. | In case of an error, respond with status 500 and an error message. |
| Get All Reviews | Product ID in the request parameters | Retrieve all reviews for a specific product using reviewService, respond with status 200 and the list of reviews. | In case of an error, respond with status 500 and an error message. |
| Create Rating | User data from the request (req.user), rating data in the request body | Create a rating using ratingService, respond with status 202 and the created rating. | In case of an error, respond with status 500 and an error message. |
| Get Products Rating | Product ID in the request parameters | Retrieve ratings for a specific product using ratingService, respond with status 200 and the list of ratings. | In case of an error, respond with status 500 and an error message. |
| Get All Orders | None | Retrieve all orders using orderService, respond with status 202 and the list of orders. | In case of an error, respond with status 500 and an error message. |
| Confirm Order | Order ID in the request parameters | Confirm an order using orderService, respond with status 202 and the confirmed order. | In case of an error, respond with status 500 and an error message. |
| Ship Order | Order ID in the request parameters | Ship an order using orderService, respond with status 202 and the shipped order. | In case of an error, respond with status 500 and an error message. |
| Deliver Order | Order ID in the request parameters | Mark an order as delivered using orderService, respond with status 202 and the delivered order. | In case of an error, respond with status 500 and an error message. |
| Cancel Order | Order ID in the request parameters | Cancel an order using orderService, respond with status 202 and the cancelled order. | In case of an error, respond with status 500 and an error message. |
| Delete Order | Order ID in the request parameters | Delete an order using orderService, respond with status 202 and a success message. | In case of an error, respond with status 500 and an error message. |
102 views
