I'm a newbie on Golang, and I'm trying to use Gin to develop a web server on Ubuntu 16.04.
After executing go get -u github.com/gin-gonic/gin
, many folders appear at ~/go/pkg/mod/github.com/
.
Then I try to make an example:
package main
import "github.com/gin-gonic/gin"
func main() {
r := gin.Default()
r.GET("/ping", func(c *gin.Context) {
c.JSON(200, gin.H{
"message": "pong",
})
})
r.Run() // listen and serve on 0.0.0.0:8080 (for windows "localhost:8080")
}
However, go run example.go
made the error:
example.go:3:8: cannot find package "github.com/gin-gonic/gin" in any of:
/usr/local/go/src/github.com/gin-gonic/gin (from $GOROOT)
/home/zyh/go/src/github.com/gin-gonic/gin (from $GOPATH)
In my system, $GOROOT
is /usr/local/go/
and $GOPATH
is ~/go/
.
How could I solve this problem?
For Go version 1.11 or newer, You should use Go Modules .
If you are just starting with Go, you should start with the newer version. I think you are using a Go version that supports go modules already because the modules you are trying to get are downloading to ~/go/pkg/mod/
directory.
go mod init your-project-name
This will create a go.mod
file in your project directory.
go mod tidy
This will fill up the go.mod
file with appropriate modules and create a go.sum
in your project directory. The go.sum contains expected cryptographic hashes of each module version.
After that, the go run example.go
command should run the program without any issues.
go mod vendor
This will bring all the vendors to your projects /vendor
directory so that you don't need to get the modules again if working from another machine on this project.
I realized that after adding a package called gopls
, my IDE is working perfectly.
Install gopls
using snap: sudo snap install gopls --classic
From the error, you can see that GOPATH is your '/home/zyh/go' not your ~/go. and you can run shell go env
to confirm where is your GOPATH? then modify it.
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