So with Go 1.16 coming out soon I figured it would be good to talk about a feature that is coming which I thought was pretty cool. This feature is included in the new embed package.
Installing Go 1.16
As of the time of writing Go 1.16 is still in beta so the steps to install it are as follows
go get golang.org/dl/go1.16rc1
go1.16rc1 download
When it’s out of beta you will just need to make sure you have upgraded using your usual upgrade mechanism brew upgrade go or download it.
//go:embed
The embed package coming in 1.16 allows you the ability to embed files as part of the Go binary. This is a pretty cool feature and with so many tools existing to provide this kind of functionality it is clear that we need it :D. Some examples are
In action
Now lets see embed in action..
Create a file called main.go and add the following code..
package main
import (
_ "embed"
"fmt"
)
//go:embed hello.txt
var message string
func main() {
fmt.Println(message)
}
Before we run this code we need to make sure we have a hello.txt that contains our message. This message can be whatever you like but I’m going for the trusty “Hello, World!”.
Run the code with the following (if we’re still in beta)
go1.16rc1 run main.go
which should output something along the lines of
Message : "Hello, World!"
Hello, World!
Now a more practical example may be embedding a version.txt or some other kind of configuration files. Another use case may be to embed assets for a webapp.
The code to do that would look something like this.
package main
import (
"embed"
"net/http"
)
//go:embed assets/*
var assets embed.FS
func main() {
fs := http.FileServer(http.FS(assets))
http.ListenAndServe(":8080", fs)
}
That is all for today and hopefully you enjoyed the post!