导入的Golang软件包说未定义/不可用

Question

So I want to create a library that I can use from a script / project I'm building. The library is called go_nessus, (full source code: http://github.com/kkirsche/go-nessus) but I'm having an issue when importing it.

An example of the go_nessus code:

# go-nessus/client
package go_nessus

import (
    "fmt"
)

func (nessus *Nessus) MakeClient(host, port, accessKey, secretKey string) Nessus {
    return Nessus{
        Ip:        fmt.Sprintf("%s", host),
        Port:      fmt.Sprintf("%s", port),
        AccessKey: fmt.Sprintf("%s", accessKey),
        SecretKey: fmt.Sprintf("%s", secretKey),
    }
}

When attempting to use this though I get the following error:

~/g/G/s/g/k/attempt ❯❯❯ go install -race && $GOPATH/bin/attempt
# github.com/kkirsche/attempt
./attempt.go:6: undefined: go_nessus.MakeClient

The test file looks like so:

package main

import "github.com/kkirsche/go-nessus"

func main() {
    nessusClient := go_nessus.MakeClient("localhost", "8834", "ExampleAccessKey", "ExampleSecretKey")
}

I sadly though can't figure out how to actually use the methods I've created without errors. Any help would be greatly appreciated in figuring out what's wrong with my import process.

My go env:

GOARCH="amd64"
GOBIN="/Users/kkirsche/git/Go/bin"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/kkirsche/git/Go"
GORACE=""
GOROOT="/usr/local/go"
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GO15VENDOREXPERIMENT=""
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="1"

Answer 1

the problem lies here:

func (nessus *Nessus) MakeClient(host, port, accessKey, secretKey string) Nessus {

and here:

    nessusClient := go_nessus.MakeClient("localhost", "8834", "ExampleAccessKey", "ExampleSecretKey")

in your package, you are making the function a member of type Nessus but in main you call it as though it were a package level function

I believe you want MakeCliet to be defined as:

func MakeClient(host, port, accessKey, secretKey string) Nessus {

which makes it a package level function.

Also, you may want to use pointers here if you don't want to copy the struct around all the time, which would be: func MakeClient(host, port, accessKey, secretKey string) *Nessus {

and then:

return &Nessus{ ...