project-layout/README.md

Standard Go Project Layout

This is a basic layout for Go application projects. It represents the most common directory structure with a number of small enhancements along with several supporting directories common to any real world application.

This project layout is intentionally generic and it doesn't try to impose a specific Go package structure.

Clone the repository, keep what you need and delete everything else!

Go Project Layout - additional background information.

Go Directories

/cmd

Main applications for this project.

The directory name for each application should match the name of the executable you want to have (e.g., /cmd/myapp).

Don't put a lot of code in the application directory. If you think the code can be imported and used in other projects, then it should live in the /pkg directory. If the code is not reusable or if you don't want others to reuse it, put that code in the /internal directory. You'll be surprised what others will do, so be explicit about your intentions!

It's common to have a small main function that imports and invokes the code from the /internal and /pkg directories and nothing else.

See the /cmd directory for examples.

/internal

Private application and library code. This is the code you don't want others importing in their applications or libraries.

Put your actual application code in the /internal/app directory (e.g., /internal/app/myapp) and the code shared by those apps in the /internal/pkg directory (e.g., /internal/pkg/myprivlib).

/pkg

Library code that's safe to use by external applications (e.g., /pkg/mypubliclib).

Other projects will import these libraries expecting them to work, so think twice before you put something here :-)

See the /pkg directory for examples.

/vendor

Application dependencies (managed manually or by your favorite dependency management tool).

Don't commit your application dependencies if you are building a library.

Service Application Directories

/api

OpenAPI/Swagger specs, JSON schema files, protocol definition files.

See the /api directory for examples.

Web Application Directories

/web

Web application specific components: static web assets, server side templates and SPAs.

Common Application Directories

/configs

Configuration file templates or default configs.

Put your confd or consul-template template files here.

/init

System init (systemd, upstart, sysv) and process manager/supervisor (runit, supervisord) configs.

/scripts

Scripts to perform various build, install, analysis, etc operations.

These scripts keep the root level Makefile small and simple (e.g., https://github.com/hashicorp/terraform/blob/master/Makefile).

See the /scripts directory for examples.

/build

Packaging and Continous Integration.

Put your cloud (AMI), container (Docker), OS (deb, rpm, pkg) package configurations and scripts in the /build/package directory.

Put your CI (travis, circle, drone) configurations and scripts in the /build/ci directory.

/deployments

IaaS, PaaS, system and container orchestration deployment configurations and templates (docker-compose, kubernetes/helm, mesos, terraform, bosh).

/test

Additional external test apps and test data. Feel free to structure the /test directory anyway you want. For bigger projects it makes sense to have a data subdirectory. For example, you can have /test/data or /test/testdata if you need Go to ignore what's in that directory. Note that Go will also ignore directories or files that begin with "." or "_", so you have more flexibility in terms of how you name your test data directory.

See the /test directory for examples.

Other Directories

/docs

Design and user documents (in addition to your godoc generated documentation).

See the /docs directory for examples.

/tools

Supporting tools for this project. Note that these tools can import code from the /pkg and /internal directories.

See the /tools directory for examples.

/examples

Examples for your applications and/or public libraries.

See the /examples directory for examples.

/third_party

External helper tools, forked code and other 3rd party utilities (e.g., Swagger UI).

/githooks

Git hooks.

/assets

Other assets to go along with your repository.

Directories You Shouldn't Have

/src

Some Go projects do have a src folder, but it usually happens when the devs came from the Java world where it's a common pattern. If you can help yourself try not to adopt this Java pattern. You really don't want your Go code or Go projects to look like Java :-)

Badges

• Go Report Card - It will scan your code with gofmt, go vet, gocyclo, golint, ineffassign, license and misspell. Replace github.com/golang-standards/project-layout with your project reference.

• GoDoc - It will provide online version of your GoDoc generated documentation. Change the link to point to your project.

• Release - It will show the latest release number for your project. Change the github link to point to your project.

Notes

A more opinionated project template with sample/reusable configs, scripts and code is a WIP.