golang如何通过viper读取config.yaml文件

1.导入依赖包

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

2.编写yaml文件

放在conf目录下，文件名叫config.yaml

# TODO  本地调试时放开
KubeSphere_URL: http://192.168.103.48:3188
# TODO 部署到环境时放开
#KubeSphere_URL: http://ks-apiserver.kubesphere-system.svc:80
KubesphereAdminUser: admin
KubespherePassword: Admin123

#TODO 调用梅 * 的ip，暂用当前，后续需要修改
Other_service_IP: http://192.168.103.48:30412
#Other_service_IP: http://container-cloud-system-controller-manager-metrics-service.container-cloud-system-system.svc:8093
Other_service_URL: /capis/quota.ictnj.io/v1alpha1/namespaces/

#TODO harbor镜像仓库地址
HARBOR_URL: https://192.168.66.4:443
HARBOR_ADMIN_USERNAME: admin
HARBOR_ADMIN_PASSWD: Harbor12345

HARBOR_IP_HTTPS: 192.168.66.4:443

HARBOR_SSH_ADDRESS: 192.168.103.48:53304
HARBOR_SSH_USERNAME: root
HARBOR_SSH_PASSWD: peng123.

3.编写读取yaml文件的go文件

放在config目录下，文件名叫config.go

需要注意的是目录的问题，如果放在同目录，直接用configurationPath，不同的编辑器，

vscode跟golang对相对路径处理不同

package config

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

const (
    configurationName = "config"
    configurationPath = "./conf"
    // vscode特殊读取路径
  //  configurationPath_vscode = "../conf" 
)

var Config *viper.Viper

func init() {
    Config = viper.New()
    Config.SetConfigName(configurationName)
    Config.AddConfigPath(configurationPath)
    Config.SetConfigType("yaml")
    Config.AddConfigPath(configurationPath)
    if err := config.ReadInConfig(); err != nil {
     panic(err)
   } 
}

如果config.yaml跟config.go放在同目录简单的路径用上面这个，如果路径不同，且不同的同事用不同的编译软件，可以尝试下面的路径兼容

package config

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

const (
    configurationName = "config"
    configurationPath = "./conf"
    // vscode特殊读取路径
    configurationPath_vscode = "../conf" 
)

var Config *viper.Viper

func init() {
    Config = viper.New()
    Config.SetConfigName(configurationName)
    Config.AddConfigPath(configurationPath)
    Config.SetConfigType("yaml")
    if err := Config.ReadInConfig(); err != nil {
        Config.AddConfigPath(configurationPath_vscode)
        if err := Config.ReadInConfig(); err != nil {
            Config.AddConfigPath(configurationPath)
            panic(err)
        }
    }
}

4.使用config对象

Config.GetString("KubeSphere_URL")

5.viper源码分析

type Viper struct {
    // Delimiter that separates a list of keys
    // used to access a nested value in one go
    keyDelim string

    // A set of paths to look for the config file in
    configPaths []string

    // The filesystem to read config from.
    fs afero.Fs

    // A set of remote providers to search for the configuration
    remoteProviders []*defaultRemoteProvider

    // Name of file to look for inside the path
    configName        string
    configFile        string
    configType        string
    configPermissions os.FileMode
    envPrefix         string

    automaticEnvApplied bool
    envKeyReplacer      StringReplacer
    allowEmptyEnv       bool

    config         map[string]interface{}
    override       map[string]interface{}
    defaults       map[string]interface{}
    kvstore        map[string]interface{}
    pflags         map[string]FlagValue
    env            map[string]string
    aliases        map[string]string
    typeByDefValue bool

    // Store read properties on the object so that we can write back in order with comments.
    // This will only be used if the configuration read is a properties file.
    properties *properties.Properties

    onConfigChange func(fsnotify.Event)
}

func (v *Viper) ReadInConfig() error {
    jww.INFO.Println("Attempting to read in config file")
    filename, err := v.getConfigFile()
    if err != nil {
        return err
    }

    if !stringInSlice(v.getConfigType(), SupportedExts) {
        return UnsupportedConfigError(v.getConfigType())
    }

    jww.DEBUG.Println("Reading file: ", filename)
    file, err := afero.ReadFile(v.fs, filename)
    if err != nil {
        return err
    }

    config := make(map[string]interface{})

    err = v.unmarshalReader(bytes.NewReader(file), config)
    if err != nil {
        return err
    }

    v.config = config
    return nil
}

把yaml文件的键值读取到viper对象的config当中

来源：https://blog.51cto.com/u_12040959/5098392