Protobuf

Every public-facing API in the Composable Commerce Platform starts as a .proto file. The code — Go gRPC handlers, TypeScript SDK, HTTP routes, request validation, error codes — is generated from that contract. This article documents the conventions that make that system work. Answer-first: Internal services communicate via gRPC (type-safe, binary, ~7× faster than JSON over REST). External clients (browser, mobile app) use REST via the Gateway Service (port 8000). The proto file is the single source of truth for the API contract — and three proto conventions require special attention for engineers coming from Magento: the Money type (never use float for prices), cursor-based pagination (never use offset), and proto-level field validation (validation declared in the contract, not in business logic). ...

Answer-first: Optimize inter-service communication in Go microservices using gRPC and Protobuf, delivering 3-10× smaller payloads and sub-millisecond latencies compared to REST. Secure communication channels with mutual TLS (mTLS), handle cross-cutting concerns using custom interceptor middleware, and implement native gRPC health checking for container readiness probes. What You’ll Learn That AI Won’t Tell You Optimizing Protobuf serialization overhead in Go-based gRPC microservices. How to set up connection keep-alive parameters to prevent TCP connection drops during peak load. Why gRPC for Go Microservices? The key advantages over REST: ...