Heldinhow/grpc-microservices

gRPC Microservices

Overview

gRPC is a high-performance RPC framework using Protocol Buffers for efficient, type-safe service communication. This skill should be invoked when building microservices requiring high performance, type-safe communication, or real-time streaming between services.

Core Principles

• Contract-First: Define services in .proto files
• Code Generation: Generate strongly-typed clients and servers
• Streaming: Support server, client, and bidirectional streaming
• Performance: Binary serialization is more efficient than JSON

Preparation Checklist

• [ ] Install protobuf compiler (protoc)
• [ ] Choose gRPC library for your language
• [ ] Design .proto service definitions
• [ ] Plan message structures

Step-by-Step Process

1. Define: Write .proto files with messages and services
2. Generate: Create code with protoc compiler
3. Implement Server: Build gRPC server implementing services
4. Implement Client: Create client stubs
5. Configure: Set up service discovery
6. Handle Streaming: Implement streaming logic

Do's and Don'ts

• ✅ Do version .proto files carefully
• ✅ Do use streaming for large data
• ✅ Do implement proper error handling
• ❌ Don't break backward compatibility
• ❌ Don't use for browser-facing APIs
• ❌ Don't skip error codes mapping

Anti-Patterns

• No Versioning: Breaking changes in .proto
• Big Payloads: Sending too much data at once
• No Error Handling: Ignoring gRPC status codes
• Sync Only: Not using streaming when beneficial