liveBook · Manning

Proto file

As explained in Learn Go with Pocket-Sized Projects

A .proto file is a text file that declares Protobuf message schemas and service interfaces for code generation.

A .proto file is a text-based contract for structured messages and service endpoints. It supports cross-language communication, versioned serialized data, and generated client or server code. section 10.1

A practical proto-file workflow includes:

  • Store files such as habit.proto and service.proto under an api/proto directory. section 10.1.1
  • Define messages with typed, uniquely numbered fields; preserve field numbers across versions for backward compatibility. section 10.1.1
  • Compile files with protoc and the Go and gRPC plugins, using import paths and source-relative output options. section 10.1.2

Habit message

A minimal definition declares a Habit message with a string name and an int32 weekly_frequency. Comments document generated APIs and their users.

How Learn Go with Pocket-Sized Projects covers it

How deep it goes
Explains headers, packages, fields, numbering, comments, imports, RPCs, and compilation, while deferring broader Protobuf coverage.
Examples
Uses a habit tracker with Habit, CreateHabitRequest, CreateHabitResponse, and Habits service definitions.
What it assumes
Assumes basic project and Go-module usage, while teaching the needed Protobuf declaration and generation basics from the beginning.
What you can do after
Builds message and service declarations, then generates Go and gRPC files with protoc.
How it connects
Connects proto files to Protobuf messages, gRPC services, RPC endpoints, Go code generation, serialization, and backward compatibility.
Cover of Learn Go with Pocket-Sized Projects
liveBookmanning.com
Read Learn Go with Pocket-Sized Projects on liveBook Get the book at manning.com

Also explained in

Compare how 3 books explain proto file →

Related concepts

This explainer was generated by Manning's knowledge graph from the text of Learn Go with Pocket-Sized Projects. The section links point to the parts of the book it draws on.