Building Lightweight Microservices With Redis & Hydra
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This document provides an overview and introduction to building microservices with Hydra and Redis. It discusses the pros and cons of microservice architectures, and how Hydra helps with microservice development by providing functionality for service presence and health monitoring, service discovery, routing, and load balancing. The document explains how Hydra uses Redis for these core features and describes Hydra's NPM ecosystem. It also provides details on Hydra's core API, using plugins to extend functionality, deploying microservices with Docker, and new features coming in Hydra 2.0.
![PRESENTED BY
Hydra uses Redis to power all core features.
• Health/presence
– Strings, Expiration, Scan/Match
• Service Discovery
– Per-service information in hash hydra:service:nodes
• Routes
– Per-service routes in set hydra:service:<name>:service:routes
• e.g. [post]/v1/service/foo or [get]/v1/service/bar
• Inter-service Messaging
– Pub/Sub
• Per-instance channel: hydra:service:mc:<name>:<id>
• Service-wide channel: hydra:service:mc:<name>
1c. Introduction: How does Hydra use Redis?](https://image.slidesharecdn.com/11ericadumbuildinglightweightmicroserviceswithredishydra-190703014505/85/Building-Lightweight-Microservices-With-Redis-Hydra-5-320.jpg)
Building Lightweight Microservices With Redis & Hydra
- 1. PRESENTED BY
- 2. PRESENTED BY 1 Introduction to Microservices with Hydra + Redis Pros/cons of a microservice architecture, and how Hydra + Redis ease microservice development. 2 Making Microservices with Hydra A quick guide to building microservices in NodeJS with the Hydra and Hydra-Express libraries. 3 Plugins, Docker, Hydra 2.0 Extending Hydra with the plugin system, using Hydra with Docker, and previewing Hydra 2.0. Agenda:
- 3. PRESENTED BY Microservices provide benefits but come with costs. • Pros – Strong Module Boundaries – Independent Deployments – Technological Diversity • Cons – Distribution – Eventual Consistency – Operational Complexity • Further reading – https://martinfowler.com/articles/microservice-trade-offs.html 1a. Introduction: Microservices?
- 4. PRESENTED BY Hydra enables rapid development of microservices with a minimal learning curve. • Hydra provides core microservice functionality – service presence and health monitoring – service discovery and inter-service requests – routing and load balancing • Hydra has a small API and minimal dependencies. – Hydra could be implemented in other languages. • Just need to follow the same Redis usage conventions 1b. Introduction: Why build Microservices with Hydra?
- 5. PRESENTED BY Hydra uses Redis to power all core features. • Health/presence – Strings, Expiration, Scan/Match • Service Discovery – Per-service information in hash hydra:service:nodes • Routes – Per-service routes in set hydra:service:<name>:service:routes • e.g. [post]/v1/service/foo or [get]/v1/service/bar • Inter-service Messaging – Pub/Sub • Per-instance channel: hydra:service:mc:<name>:<id> • Service-wide channel: hydra:service:mc:<name> 1c. Introduction: How does Hydra use Redis?
- 6. PRESENTED BY What’s available in the Hydra NPM ecosystem? • hydra – Core microservice features • hydra-express – Leverage ExpressJS for HTTP APIs and web apps • hydra-router – service-aware router via HTTP and WebSockets • hydra-cli – eases common tasks like checking health logs and managing service configurations • hydra-plugins – e.g. auth, logging, RPC 2a. Making Microservices with Hydra: NPM Ecosystem
- 7. PRESENTED BY Overview of Hydra’s core functions. • init – Loads config.json and connects to Redis, puts Hydra in “Consumer mode.” • registerService – Registers this instance as a service, puts Hydra in “Service mode.” – Hydra will now update health and presence in Redis. • registerRoutes – Register API endpoints for this service. • sendMessage – Send routable messages to services (broadcast, service-wide, or by instance ID) • makeAPIRequest – Make API requests to registered routes 2b. Making Microservices with Hydra: Core API
- 8. PRESENTED BY Easily re-use features via plugins. • Plugins can target hydra core – hydra-plugin-<name> • or hydra-express – hydra-express-plugin-<name> Current plugins include… • JWT auth – hydra-express-plugin-jwt-auth • Logging – fwsp-logger 3a. Making Microservices with Hydra: Plugins
- 9. PRESENTED BY • fwsp-docker-scripts – Adding this to package.json scripts will add “docker build” and “docker push” – Automatically generates a simple Dockerfile • Redis configuration – config.json can be packaged in the image or pulled from Redis – HYDRA_REDIS_URL and HYDRA_SERVICE environment variables – hydra-cli cfg push/pull • Health checks – /v1/<service>/health route should return hydra.getHealth() 3b. Docker and Hydra
- 10. PRESENTED BY • TypeScript • async/await • ioredis • redis 5.x features 3c. Hydra 2.0