Overview

The Sustainable Diet Platform is designed to promote sustainable eating habits through a mobile application. The platform provides various services, including member management, knowledge content, discussion forums, activities and news updates, geographic information services, and email services. Each service is built as a microservice to ensure scalability, flexibility, and ease of maintenance.

ios: https://apps.apple.com/tw/app/節食/id6504645032?l=en-GB&platform=iphone
android: under release procedure

System Architecture

Mobile App

• Description: Interface for users to interact with the platform.
• Technologies: Flutter (for mobile development).

Web App (Future Implementation)

• Description: Interface for backend maintenance and administrative tasks.
• Technologies: Next.js (for web development).

RBAC-Member Service

• Description: Handles all member-related functionalities, including authentication, authorization, and session management.

• Technologies: Go, PostgreSQL, Redis, gRPC.

• Components:

  • OAuth2.0 Component: Manages Google login.
  • Token Management Component: Issues and verifies JWT tokens.
  • Member Database Component: Stores member information and settings in PostgreSQL.
  • Session Management Component: Handles login time updates using Redis.
  • gRPC Interface Component: Communicates with other services to verify token validity.
  • Request Handling Component: Processes incoming requests from the frontend.

Knowledge Service

• Description: Provides monthly themes related to flowers and solar terms, knowledge about agricultural products and crops from various counties, and recipe information.

• Technologies: Go, MongoDB.

• Components:

  • Content Database Component: Stores knowledge content in MongoDB.
  • Content Delivery Component: Delivers content to users.
  • Request Handling Component: Processes incoming requests from the frontend.

Recipe Service

• Description: Manages recipe content and discussions.

• Technologies: Go, MongoDB, PostgreSQL, gRPC.

• Components:

  • Recipe Database Component: Stores recipes in MongoDB.
  • Comment Management Component: Manages comments using PostgreSQL.
  • Recipe Management Component: Manages recipe content and interactions.
  • Member Verification Component: Verifies member access to recipe content.
  • gRPC Interface Component: Communicates with the RBAC-Member Service.
  • Request Handling Component: Processes incoming requests from the frontend.

Notification Service

• Description: Handles push notifications to users.

• Technologies: Go, MongoDB, FCM, NATS.

• Components:

  • FCM Component: Responsible for sending push notifications.
  • NATS Component: Receives push notification messages.
  • MongoDB Component: Stores news information and FCM tokens.
  • Request Handling Component: Processes incoming requests and messages.

Challenge Service

• Description: Manages monthly challenges, exploration tasks, member achievements, and badges.

• Technologies: Go, PostgreSQL, gRPC.

• Components:

  • Challenge Database Component: Stores challenge and task information.
  • Achievement Component: Manages member achievements and badges.
  • gRPC Interface Component: Communicates with the RBAC-Member Service for verification.
  • Request Handling Component: Processes incoming requests from the frontend.

Broadcaster

• Description: A daemon service for web scraping and scheduled tasks.

• Technologies: Go, Colly, NATS.

• Components:

  • Web Scraping Component: Uses Colly to scrape news websites.
  • Scheduled Task Component: Checks for new months and solar terms.
  • NATS Publishing Component: Sends messages to NATS for Notification Service processing.

Geographic Information Service

• Description: Converts GPS coordinates to location information (city/county).

• Technologies: Go, PostgreSQL (OSM).

• Components:

  • OSM Database Component: Manages geographic information using a self-hosted PostgreSQL (OSM) database.
  • Geocoding Component: Converts GPS coordinates to geographic locations.
  • GPS to City/County Conversion Component: Translates geographic locations to specific city/county information.
  • Request Handling Component: Processes incoming requests from the frontend.

Mail Service

• Description: Handles password reset functionality for forgotten passwords.

• Technologies: Go, PostgreSQL.

• Components:

  • Mail Database Component: Stores email-related information in PostgreSQL.
  • Password Reset Component: Manages the password reset process.
  • Email Sending Component: Responsible for sending password reset emails.
  • Request Handling Component: Processes incoming requests from the frontend.

Security

• Database Authentication: All backend databases require certificate authentication for login.
• Data Encryption: Private data is encrypted using bcrypt.
• HTTPS: All services communicate over HTTPS for secure data transmission.
• gRPC: Services use gRPC for efficient and reliable inter-service communication.
• JWT: JSON Web Tokens (JWT) are used for secure authentication and authorization.

Scalability

• Each microservice is designed to be scalable and can be deployed independently to handle increased load.
• Redis and PostgreSQL are used for efficient session management and data storage.
• MongoDB is utilized for storing unstructured content, ensuring flexibility and scalability.

Future Enhancements

• Implementation of the web app for backend maintenance and administrative tasks.

Continuous Integration and Deployment

• All developed backends use GitHub workflows for CI/CD to automate testing and deployment processes.