boilerplate-api-service

Boilerplate API Service

Introduction

An example project designed to flesh out boilerplate, project structure and CI/CD process. Notable features include:

• Service implementation using the Go language and the Echo Web Framework
• Contract-First using OpenAPI
• Types, server and client code generation with oapi-codegen
• Simple deployment via a single binary or lightweight Containerfile

Getting Started

Ensure you have the following installed and correctly setup before proceeding to build the project:

1. Go Development Tools
   • Available for all platforms here
2. GNU Make
   • Available in all GNU/Linux package managers (i.e. dnf install make or apt-get install make)
   • Available in Windows via Chocolatey (i.e. choco install make)

Optional Extras:

1. OpenAPI Code Generator (aka oapi-codegen for regenerating any OpenAPI changes)
   • Available via go install github.com/deepmap/oapi-codegen/cmd/oapi-codegen@latest
2. golangci-lint (for running linting tasks)
   • Available for all platforms here
3. Docker (or preferably Podman for building the container image)
   • Available for Windows here
   • Podman is only available for GNU/Linux here. Don't forget to enable docker aliasing

Build and Test

# Run the test suite
$ make test

# Build the service binary and run it
$ make build
$ ./bin/boilerplate[.exe]

OR

# Just start the service
$ make run

Project Structure

├── cmd                          # Go conventional folder for entrypoints
│   └── boilerplate              # Corresponds to the compiled binary name
│       └── main.go              # Entry point for the application
│
├── internal                     # Go conventional folder for private code
│   └── service                  # Contains service implementation code
│       ├── boilerplate.go       # Implementation of the API interface
│       └── boilerplate_test.go  # Unit tests for the service implementation
│
├── pkg                          # Go conventional folder for shared code
│   └── api                      # Contains generated code from OpenAPI
│       ├── client.go            # Generated OpenAPI client
│       ├── types.go             # Generated types from the spec's model schema
│       └── server.go            # Generated HTTP server interface from the spec
│
├── go.mod                       # Go modules dependencies
├── go.sum                       # Go modules checksums
├── Makefile                     # Make targets defining project tasks to run
├── openapi.yaml                 # OpenAPI definitions for the API
├── Containerfile                # aka Dockerfile for building a container image
└── README.md                    # What you are looking at

Do not attempt to add or edit any files in the project's pkg/api directory. Files in this directory are automatically generated and any changes will be wiped anytime the OpenAPI definitions are updated.

Available Commands

Targets for various functions can be listed simply by running make. These tasks include:

• build - Build the project and put the output binary in bin/
• test - Run the project's test suite
• lint - Run linting and static analysis tools (golangci-lint)
• clean - Delete build related files
• run - Start the service
• build-image - Build a container image using the project Containerfile
• run-container - Run the service from a previously built image
• generate-oapi - Regenerate server/client code from OpenAPI definitions
• help - Show available make targets (i.e. this list)