config.go

// Copyright 2018 Shestakov Denis. All rights reserved.
// Use of this source code is governed by a Lil
// license that can be found in the LICENSE file.

// Package config provides app configuration reading and validating.
package config

import (
  "fmt"
  "errors"
  "io/ioutil"
  "os"

  "gopkg.in/yaml.v2"
)

// Config described configuration file with reading.
type Config interface {
  FromFile(path string) (Config, error)
  Version() Version
}

// FromFileUnm reads and validates config to `s` struct from `path` file
// by unm function (like yaml.Unmarshal, json.Unmarshal and so on).
func FromFileUnm(path string) (Config, error) {
  fileBytes, err := readFile(path)
  if err != nil {
    return nil, err
  }

  var confVer version
  yaml.Unmarshal(fileBytes, confVer)

  return nil, errors.New("Not implemented")
}

func readFile(path string) ([]byte, error) {
  file, err := os.Open(path)
  if err != nil {
    return nil, err
  }
  defer file.Close()

  fileBytes, err := ioutil.ReadAll(file)
  if err != nil {
    return nil, err
  }

  return fileBytes, nil
}

// V1_0 is the first implementation of config file.
type V1_0 struct {
  Config
}

// FromFile reads and validates config to struct instance from `path` file.
func (config *V1_0) FromFile(path string) {
  cfg, err := FromFileUnm(path)
  if err != nil {
    fmt.Println("Error")
  }
  fmt.Println("Config:", cfg)
}

main.go

// Copyright 2018 Shestakov Denis. All rights reserved.
// Use of this source code is governed by a Lil
// license that can be found in the LICENSE file.

package main

import (
    "warlog/config"
)


func main() {
    var cfg config.V1_0;
    cfg.FromFile("config/test_data/test_1_0.yml")
}