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NomadCrew Project Documentation

Introduction

Welcome to the NomadCrew project! This document provides a comprehensive overview of the system architecture, components, and workflows for the NomadCrew app – a platform for creating disposable groups for trips with live location sharing, messaging, media sharing, and expense splitting.

System Architecture Overview

NomadCrew utilizes a microservices architecture to ensure scalability and maintainability. The frontend is developed with Svelte Native for a seamless cross-platform user experience. The backend, powered by Go, is composed of several microservices that handle different aspects of the app such as user management, group handling, and live location updates. Communication between services is facilitated through gRPC for efficiency and performance. The app leverages PostgreSQL for relational data storage and ...

Frontend - Svelte Native

Key Features

  • User authentication
  • Group management
  • Live location sharing
  • In-app messaging
  • Media sharing
  • Expense splitting

Component Diagram

classDiagram
    class UserInterface {
        +render()
    }
    class Authentication {
        +login()
        +register()
        +logout()
    }
    class GroupManagement {
        +createGroup()
        +joinGroup()
        +leaveGroup()
    }
    class LocationSharing {
        +shareLocation()
        +updateLocation()
    }
    class Messaging {
        +sendMessage()
        +receiveMessage()
    }
    class MediaSharing {
        +uploadMedia()
        +downloadMedia()
    }
    class ExpenseManagement {
        +addExpense()
        +splitExpense()
    }

    UserInterface --> Authentication
    UserInterface --> GroupManagement
    UserInterface --> LocationSharing
    UserInterface --> Messaging
    UserInterface --> MediaSharing
    UserInterface --> ExpenseManagement
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Backend - Go with gRPC

Services

  • User Service
  • Group Service
  • Location Service
  • Messaging Service
  • Media Service
  • Expense Service

Sequence Diagram for Location Update

sequenceDiagram
    participant UserApp
    participant LocationService
    participant GroupService
    participant Database

    UserApp->>+LocationService: UpdateLocation(userId, newLocation)
    LocationService->>+Database: SaveLocation(userId, newLocation)
    Database-->>-LocationService: Acknowledge
    LocationService->>+GroupService: NotifyGroupMembers(groupId, newLocation)
    GroupService->>+Database: GetGroupMembers(groupId)
    Database-->>-GroupService: MembersList
    GroupService-->>-LocationService: MembersLocation
    LocationService-->>-UserApp: UpdateSuccess
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Database - PostgreSQL and Redis

Schema Design

Users

  • UserID (Primary Key)
  • Username
  • Email
  • PasswordHash
  • ProfilePictureURL
  • CreatedAt
  • UpdatedAt

Groups

  • GroupID (Primary Key)
  • GroupName
  • Description
  • CreatedAt
  • UpdatedAt

GroupMembers

  • GroupID (Foreign Key)
  • UserID (Foreign Key)
  • MemberRole (e.g., Admin, Member)
  • JoinedAt
  • Composite Primary Key: (GroupID, UserID)

Locations

  • LocationID (Primary Key)
  • UserID (Foreign Key)
  • Latitude
  • Longitude
  • Timestamp

Messages

  • MessageID (Primary Key)
  • GroupID (Foreign Key)
  • SenderID (Foreign Key)
  • Content
  • CreatedAt

Media

  • MediaID (Primary Key)
  • GroupID (Foreign Key)
  • UploaderID (Foreign Key)
  • MediaURL
  • MediaType (e.g., Image, Video)
  • CreatedAt

Expenses

  • ExpenseID (Primary Key)
  • GroupID (Foreign Key)
  • PaidByUserID (Foreign Key)
  • Amount
  • Description
  • CreatedAt

ExpenseContributions

  • ExpenseID (Foreign Key)
  • ContributorUserID (Foreign Key)
  • ContributionAmount
  • Composite Primary Key: (ExpenseID, ContributorUserID)

Infrastructure and DevOps

  • Docker and Kubernetes for containerization and orchestration
  • GitHub Actions for CI/CD
  • Prometheus, Grafana, and Sentry for monitoring

Infrastructure Diagram

graph LR
    A[GitHub Repository] -- Triggers --> B(GitHub Actions)
    B -- Build & Test --> C[Docker]
    C -- Deploy --> D[Kubernetes Cluster]
    D -- Hosts --> E{Microservices}
    E -- Connects --> F[PostgreSQL]
    E -- Connects --> G[Redis]
    E -- Reports --> H[Prometheus]
    H -- Visualizes --> I[Grafana]
    E -- Logs --> J[Sentry]
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Contribution Guidelines

Contributors are welcome to join the NomadCrew project! Here are some guidelines to ensure a smooth collaboration:

  • Coding Standards: Follow best practices for Svelte Native and Go.
  • Pull Requests: All PRs should be accompanied by a clear description of changes. Code reviews are mandatory before merging.
  • Testing: New features should include unit and integration tests.
  • Issue Tracking: Use GitHub issues to track bugs and feature requests. Be detailed in your reports.
  • Code of Conduct: Respect all contributors, be open to feedback, and conduct yourself professionally. No tolerance for harassment or abusive behavior.

Project Roadmap

  • Phase 1: Initial setup, basic user authentication, and group creation functionality.
  • Phase 2: Implement live location sharing and basic messaging features.
  • Phase 3: Add media sharing and expense splitting features.
  • Phase 4: Focus on testing, feedback collection, and refining features for the first official release. Plan for post-release updates and feature additions.

Contact and Support

For more information or support, please reach out to [your email/contact information]. You can also join our Slack workspace [link to Slack workspace] to be a part of the NomadCrew community.