go-bindata使用，将配置文件打包到可执行程序中，防止别人修改配置文件

通常后端服务启动需要的配置文件，然而配置文件中包含了敏感信息，出于安全考虑，将配置文件直接编译到可以执行文件中。.toml，.json，.yaml等后缀的文件都可以打包，我使用的是.toml。根据业务需要来选择。原理都一样

操作步骤：

1. 安装go-bindata包

go get -u github.com/go-bindata/go-bindata/...

2. 查看是否安装成功

执行： go-bindata -help，出现如图，表示安装成功

 3. 执行编译语句 

go-bindata -pkg=tool -o=./tool/conf.go test.toml
-pkg : 表示目录名，目录名不存在会自动创建在当前目录下

-o:表示将配置文件生成的.go文件放到那个目录的那个文件下

test.toml： 要打包的配置文件

4. 代码示例,使用的配置文件如下

# test.toml文件内容示例
[general]
listen="0.0.0.0:9090"

package main

import (
	"bytes"
	"fmt"
	"github.com/spf13/viper"
)

func main(){
	data, _ := Asset("test.toml")
	fmt.Println(string(data))
	conf(data)
	fmt.Println("listen:",C.General.Listen)

}


var C Config

type Config struct {
	General struct {
		Listen    string `mapstructure:"listen"`
	}`mapstructure:"general"`
}

func conf(b []byte) {
	if len(b) >= 0  {
		viper.SetConfigType("toml")
		if err := viper.ReadConfig(bytes.NewBuffer(b)); err != nil {
			fmt.Println("error loading config file")
		}
	}

	if err := viper.Unmarshal(&C); err != nil {
		fmt.Println("error loading config file",err)
	}
}

5.  生成的conf.go文件，我也直接贴出来吧

package main

import (
	"bytes"
	"compress/gzip"
	"fmt"
	"io"
	"strings"
)

func bindata_read(data []byte, name string) ([]byte, error) {
	gz, err := gzip.NewReader(bytes.NewBuffer(data))
	if err != nil {
		return nil, fmt.Errorf("Read %q: %v", name, err)
	}

	var buf bytes.Buffer
	_, err = io.Copy(&buf, gz)
	gz.Close()

	if err != nil {
		return nil, fmt.Errorf("Read %q: %v", name, err)
	}

	return buf.Bytes(), nil
}

var _test_toml = []byte("\x1f\x8b\x08\x00\x00\x00\x00\x00\x00\xff\x8a\x4e\x4f\xcd\x4b\x2d\x4a\xcc\x89\xe5\xe5\xca\xc9\x2c\x2e\x49\xcd\xb3\x55\x32\xd0\x03\x43\x2b\x4b\x03\x4b\x03\x25\x40\x00\x00\x00\xff\xff\x62\x15\x90\x2b\x20\x00\x00\x00")

func test_toml() ([]byte, error) {
	return bindata_read(
		_test_toml,
		"test.toml",
	)
}

// Asset loads and returns the asset for the given name.
// It returns an error if the asset could not be found or
// could not be loaded.
func Asset(name string) ([]byte, error) {
	cannonicalName := strings.Replace(name, "\\", "/", -1)
	if f, ok := _bindata[cannonicalName]; ok {
		return f()
	}
	return nil, fmt.Errorf("Asset %s not found", name)
}

// AssetNames returns the names of the assets.
func AssetNames() []string {
	names := make([]string, 0, len(_bindata))
	for name := range _bindata {
		names = append(names, name)
	}
	return names
}

// _bindata is a table, holding each asset generator, mapped to its name.
var _bindata = map[string]func() ([]byte, error){
	"test.toml": test_toml,
}
// AssetDir returns the file names below a certain
// directory embedded in the file by go-bindata.
// For example if you run go-bindata on data/... and data contains the
// following hierarchy:
//     data/
//       foo.txt
//       img/
//         a.png
//         b.png
// then AssetDir("data") would return []string{"foo.txt", "img"}
// AssetDir("data/img") would return []string{"a.png", "b.png"}
// AssetDir("foo.txt") and AssetDir("notexist") would return an error
// AssetDir("") will return []string{"data"}.
func AssetDir(name string) ([]string, error) {
	node := _bintree
	if len(name) != 0 {
		cannonicalName := strings.Replace(name, "\\", "/", -1)
		pathList := strings.Split(cannonicalName, "/")
		for _, p := range pathList {
			node = node.Children[p]
			if node == nil {
				return nil, fmt.Errorf("Asset %s not found", name)
			}
		}
	}
	if node.Func != nil {
		return nil, fmt.Errorf("Asset %s not found", name)
	}
	rv := make([]string, 0, len(node.Children))
	for name := range node.Children {
		rv = append(rv, name)
	}
	return rv, nil
}

type _bintree_t struct {
	Func func() ([]byte, error)
	Children map[string]*_bintree_t
}
var _bintree = &_bintree_t{nil, map[string]*_bintree_t{
	"test.toml": &_bintree_t{test_toml, map[string]*_bintree_t{
	}},
}}