Playbook example using go module

helloworld_src.go

// This file is part of Ansible
//
// Ansible is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Ansible is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"
)

type ModuleArgs struct {
	Name string
}

type Response struct {
	Msg     string `json:"msg"`
	Changed bool   `json:"changed"`
	Failed  bool   `json:"failed"`
}

func ExitJson(responseBody Response) {
	returnResponse(responseBody)
}

func FailJson(responseBody Response) {
	responseBody.Failed = true
	returnResponse(responseBody)
}

func returnResponse(responseBody Response) {
	var response []byte
	var err error
	response, err = json.Marshal(responseBody)
	if err != nil {
		response, _ = json.Marshal(Response{Msg: "Invalid response object"})
	}
	fmt.Println(string(response))
	if responseBody.Failed {
		os.Exit(1)
	} else {
		os.Exit(0)
	}
}

func main() {
	var response Response

	if len(os.Args) != 2 {
		response.Msg = "No argument file provided"
		FailJson(response)
	}

	argsFile := os.Args[1]

	text, err := ioutil.ReadFile(argsFile)
	if err != nil {
		response.Msg = "Could not read configuration file: " + argsFile
		FailJson(response)
	}

	var moduleArgs ModuleArgs
	err = json.Unmarshal(text, &moduleArgs)
	if err != nil {
		response.Msg = "Configuration file not valid JSON: " + argsFile
		FailJson(response)
	}

	var name string = "World"
	if moduleArgs.Name != "" {
		name = moduleArgs.Name
	}

	response.Msg = "Hello, " + name + "!"
	ExitJson(response)
}

Makefile

all: build playbook

build:
	cd library && go build -o helloworld helloworld_src.go && cd ..

playbook:
	DEFAULT_MODULE_PATH=~/.ansible/plugins/modules:/usr/share/ansible/plugins/modules:./modules/ ansible-playbook play.yaml


# vim:ft=make
#

play.yaml

#!/bin/env ansible-playbook
- hosts: all
  gather_facts: false
  tasks:
    - name: modulo binario
      helloworld:
        foo: bar
        name: Mundo
      register: out

    - name: debug modulo binario
      debug:
        var: out