Our microservices ultimately need at least a database connection in order to query and store data in a MySQL database. We need to pass this object, possibly from the main() function, to our service implementation.

I have learned through trial and error, that “Dependency Injection” is a term which manages to evoke a strong emotional response in gophers. As I’ve said before, all that the term represents in Go is “a way to pass stuff into our handlers”,...