seno-blackdragon

Challenge Project Booking

1. Authentication & Authorization Enterprise-grade

• JWT access + refresh token with Redis (revoke/rotation).
• Multi-device login(device + user_id), role-based + permission-based authorization.
• Middleware: logging TraceID, rate-limit, IP blocking.
• Challenge: Stateless performance vs. real-time revocation. Flow: Login: 1. user & password 2. ensure device 3. create session 4. issue access Token

2. Booking & Payment Consistency

• Flow: booking → hold → payment → confirmation.
• Ensure idempotency: prevent duplicate bookings.
• DB transaction + Redis lock for race conditions (double booking).
• Challenge: balance speed & data safety (overselling rooms).

3. Distributed Cache & Invalidation

• Redis cache for property/room list.
• Handle cache invalidation when landlord updates room info.
• Use versioning keys (room:v{n}:{id}).
• Challenge: stale cache leading to data mismatch.

4. CI/CD Zero Downtime

• GitHub Actions: build → push GHCR → deploy.
• Auto migration + rollback if failed.
• Hot-reload service / blue-green deployment.
• Challenge: heavy ALTER TABLE migration may lock DB.

5. Logging & Monitoring (Enterprise-grade)

• Zap structured JSON logs, integrate with ELK / Grafana Loki.
• TraceID from FE → API → DB query.
• Alerts when API 5xx exceed threshold.
• Challenge: avoid noisy logs while keeping debug info.

6. Microservice-ready Refactor

• Current: monolith (internal/api, internal/service…).
• Task: split into Auth, Booking, Payment services.
• Communication via gRPC or message queue (Kafka/NATS).
• Challenge: ensure data consistency (saga pattern, eventual consistency).

1) Xoá file cũ (nếu sai)

sudo rm -f /etc/apt/sources.list.d/docker.list

2) Đảm bảo keyrings tồn tại & key có sẵn

sudo mkdir -p /etc/apt/keyrings curl -fsSL https://download.docker.com/linux/ubuntu/gpg |
sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg sudo chmod a+r /etc/apt/keyrings/docker.gpg

3) Ghi lại docker.list với đúng cú pháp, trên MỘT dòng

ARCH=$(dpkg --print-architecture) CODENAME=focal # hoặc: CODENAME=$(. /etc/os-release && echo $VERSION_CODENAME) echo "deb [arch=${ARCH} signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu ${CODENAME} stable" | sudo tee /etc/apt/sources.list.d/docker.list >/dev/null

4) (Tuỳ chọn) loại CRLF nếu bạn từng chỉnh file bằng editor Windows

sudo sed -i 's/\r$//' /etc/apt/sources.list.d/docker.list

5) Kiểm tra lại nội dung (phải là một dòng duy nhất, không thừa khoảng trắng lạ)

cat -n /etc/apt/sources.list.d/docker.list

6) Cập nhật & cài đặt

sudo apt-get update sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin