Containr/app/backend/README_BACKEND.md

Containr Backend Setup

Quick Start

Prerequisites

• Go 1.21+
• PostgreSQL 12+
• Dragonfly (Redis-compatible cache)

Environment Variables

Create a .env file for local backend work, and use the repository root .env.prod for production deployments:

# Database
DATABASE_URL=postgres://containr:password@localhost:5432/containr?sslmode=disable
MAX_CONNECTIONS=25
MAX_IDLE_CONNECTIONS=5
CONN_MAX_LIFETIME=5m
CONN_MAX_IDLE_TIME=5m
AUTO_MIGRATE=true
MIGRATION_LOCK_TIMEOUT=2m
SEED_DATA_ON_START=false
REDIS_URL=redis://:password@localhost:6379/0

# Server
PORT=8080
ENVIRONMENT=development
HOST=0.0.0.0
MAX_REQUEST_BODY_BYTES=10485760

# Security
# In production this must be at least 32 characters.
JWT_SECRET=your-production-jwt-secret-at-least-32-characters
# In production this must be true.
COOKIE_SECURE=false

# Frontend (for CORS)
CORS_ORIGINS=http://localhost:3000,http://localhost:8080

# Optional: trust reverse proxy CIDR (recommended behind Traefik)
TRUSTED_PROXY_CIDR=172.20.0.0/16

Database Setup

1. Create PostgreSQL database:

CREATE DATABASE containr;
CREATE USER containr WITH PASSWORD 'password';
GRANT ALL PRIVILEGES ON DATABASE containr TO containr;

2. Run migrations (handled automatically on server start)

   # Optional: run all migrations without starting the API server
   go run cmd/migrate/main.go up
   
   # Legacy chain only
   go run cmd/migrate/main.go legacy-up
   
   # Goose chain only
   go run cmd/migrate/main.go goose-up
   go run cmd/migrate/main.go goose-status
   go run cmd/migrate/main.go goose-create add_new_table
   

3. Managed database runtime notes

   • The /api/v1/databases endpoints provision real database containers when the backend has access to Docker.
   • Database status is reconciled against real container state on read operations.
   • Metrics are collected from Docker container stats when available, with fallback values when unavailable.
   • Backups are persisted in database_backups and executed as Docker volume snapshots into the containr-db-backups volume.
   • Restores rehydrate the managed DB volume from the selected completed backup archive.
   • If Docker is unavailable, runtime lifecycle operations fail safely and backup jobs are marked failed.
   • Supported managed types: postgresql, redis, dragonfly, mysql, mariadb, mongodb, clickhouse.
   • Deploying a database service template via /api/v1/templates/:id/deploy now creates a managed database entry and starts provisioning.

Running the Server

# Build
go build -o bin/server cmd/server/main.go

# Run
./bin/server

The server will start on http://localhost:8080

Embedded Better Auth

The backend now starts the Better Auth runtime as a child process during boot. In Docker this is fully bundled into the backend image. For non-Docker local runs, install the auth runtime dependencies first:

cd auth
npm ci
cd ..

API Endpoints

Health Check

• GET /live - Liveness probe (process is running)
• GET /health - Dependency-aware health status (DB + Redis)
• GET /ready - Readiness probe (same checks as /health)

Authentication

• POST /api/v1/auth/login - User login
• POST /api/v1/auth/register - User registration

User Profile

• GET /api/v1/user/profile - Get user profile (requires auth)
• PUT /api/v1/user/profile - Update user profile (requires auth)

Projects

• GET /api/v1/projects - List user projects (requires auth)
• POST /api/v1/projects - Create project (requires auth)
• GET /api/v1/projects/:id - Get project details (requires auth)
• PUT /api/v1/projects/:id - Update project (requires auth)
• DELETE /api/v1/projects/:id - Delete project (requires auth)

Authentication

Include JWT token in Authorization header:

Authorization: Bearer <your-jwt-token>

Example Usage

1. Register a user:

curl -X POST http://localhost:8080/api/v1/auth/register \
  -H "Content-Type: application/json" \
  -d '{
    "email": "[email protected]",
    "password": "password123",
    "name": "Test User"
  }'

2. Login:

curl -X POST http://localhost:8080/api/v1/auth/login \
  -H "Content-Type: application/json" \
  -d '{
    "email": "[email protected]",
    "password": "password123"
  }'

3. Create a project (using token from login):

curl -X POST http://localhost:8080/api/v1/projects \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer <token>" \
  -d '{
    "name": "My Project",
    "description": "A test project"
  }'

Development

Project Structure

cmd/server/          - Main application entry point
internal/
├── api/             - HTTP handlers and routes
├── config/          - Configuration management
├── database/        - Database connections and migrations
└── middleware/      - HTTP middleware
migrations_goose/    - Goose-managed migrations (single migration path)

Adding New Endpoints

1. Create handler functions in internal/api/
2. Add routes in internal/api/routes.go
3. Update database schema:
   • All migrations live in migrations_goose/ using goose format (-- +goose Up/Down).
   • 20260401163000_baseline.sql carries the consolidated schema; append new files after it.
   • Never edit the baseline in place; always add a new migration file.

SQLC (Type-Safe Queries)

Generate Go query code from SQL definitions:

go run github.com/sqlc-dev/sqlc/cmd/[email protected] generate

Files:

• Config: sqlc.yaml
• Schema for parsing: sqlc/schema.sql
• Query definitions: sqlc/queries/*.sql
• Generated output: internal/database/sqlcdb/