myapp/ cmd/ server/ main.go /internal http/ middleware.go middleware_test.go route.go server.go userhandler.go psql/ psql.go userrepository.go service/ userservice/ userservice.go userservice_test.go # Domain types models.go
Your application has a logical, high-level language that describes how data and processes interact. This is your domain. If you have an e-commerce application your domain involves things like customers, accounts, charging credit cards, and handling inventory. If you’re Facebook then your domain is users, likes, & relationships. It’s the stuff that doesn’t depend on your underlying technology.
Main applications for this project.
The directory name for each application should match the name of the executable you want to have (e.g.,
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
/pkg directories and nothing else.
/cmd directory for examples.
Private application and library code. This is the code you don’t want others importing in their applications or libraries.
You can optionally add a bit of extra structure to your internal packages to separate your shared and non-shared internal code. It’s not required, but it’s nice to have visual clues showing the intended package use. Your actual application code can go in the
/internal/app directory (e.g.,
/internal/app/myapp) and the code shared by those apps in the
/internal/pkg directory (e.g.,
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