无法使用毒蛇解组
Unable to unmarshal using viper
我一直在尝试通过解组我的 json 文件来提取一些 JSON,但是,我不知道为什么它没有发生。我可以使用 viper.AllSettings()
但不能通过解组来获取数据。
我认为我犯了一个愚蠢的错误,请分享您的想法。
githublink是-https://github.com/parthw/100-days-of-code/tree/main/golang/d6-cobra-viper-continued,代码如下
main.go
package main
import (
"fmt"
"example.com/cobra-viper/cmd"
"github.com/spf13/viper"
)
// Myconfig example
type Myconfig struct {
username string `mapstructure:"username"`
}
func main() {
cmd.Execute()
fmt.Println("I can print this ", viper.AllSettings())
var mc Myconfig
if err := viper.Unmarshal(&mc); err != nil {
fmt.Println(err)
}
fmt.Println(mc)
}
在 cmd 目录中使用 cobra CLI 生成的代码:
package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
homedir "github.com/mitchellh/go-homedir"
"github.com/spf13/viper"
)
var (
cfgFile string
author string
)
// Myconfig example
type Myconfig struct {
username string
}
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "cobra-viper",
Short: "A brief description of your application",
Long: `A longer description that spans multiple lines and likely contains
examples and usage of using your application. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
// Uncomment the following line if your bare application
// has an action associated with it:
Run: func(cmd *cobra.Command, args []string) {
fmt.Println("Welcome to rootcmd")
var mc Myconfig
if err := viper.Unmarshal(&mc); err != nil {
fmt.Println(err)
}
fmt.Println(mc)
fmt.Println("I can print this ", viper.AllSettings())
},
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Println("I can print this ", viper.AllSettings())
}
func init() {
cobra.OnInitialize(initConfig)
// Here you will define your flags and configuration settings.
// Cobra supports persistent flags, which, if defined here,
// will be global for your application.
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra-viper.json)")
//rootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
// Cobra also supports local flags, which will only run
// when this action is called directly.
//rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
//viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Search config in home directory with name ".cobra-viper" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".cobra-viper")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
}
输出:
~/Documents/personal-git/100-days-of-code/golang/d6-cobra-viper-continued(main*) » go run main.go
Using config file: /Users/parth/.cobra-viper.json
Welcome to rootcmd
{}
I can print this map[username:parth-wadhwa]
I can print this map[username:parth-wadhwa]
I can print this map[username:parth-wadhwa]
{}
JSON 文件:
~/Documents/personal-git/100-days-of-code/golang/d6-cobra-viper-continued(main*) » cat /Users/parth/.cobra-viper.json
{
"username": "parth-wadhwa"
}
您的问题归结为一个事实,即 MyConfig
结构中的 username
字段是否导出。它需要大写才能“导出”,以便 Unmarshal
将值解码到结构中。
type Myconfig struct {
Username string `mapstructure:"username"`
}
您可以查看 JSON and dealing with unexported fields 以了解更多有关 json
包为何需要它的信息。
我一直在尝试通过解组我的 json 文件来提取一些 JSON,但是,我不知道为什么它没有发生。我可以使用 viper.AllSettings()
但不能通过解组来获取数据。
我认为我犯了一个愚蠢的错误,请分享您的想法。
githublink是-https://github.com/parthw/100-days-of-code/tree/main/golang/d6-cobra-viper-continued,代码如下
main.go
package main
import (
"fmt"
"example.com/cobra-viper/cmd"
"github.com/spf13/viper"
)
// Myconfig example
type Myconfig struct {
username string `mapstructure:"username"`
}
func main() {
cmd.Execute()
fmt.Println("I can print this ", viper.AllSettings())
var mc Myconfig
if err := viper.Unmarshal(&mc); err != nil {
fmt.Println(err)
}
fmt.Println(mc)
}
在 cmd 目录中使用 cobra CLI 生成的代码:
package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
homedir "github.com/mitchellh/go-homedir"
"github.com/spf13/viper"
)
var (
cfgFile string
author string
)
// Myconfig example
type Myconfig struct {
username string
}
// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
Use: "cobra-viper",
Short: "A brief description of your application",
Long: `A longer description that spans multiple lines and likely contains
examples and usage of using your application. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
// Uncomment the following line if your bare application
// has an action associated with it:
Run: func(cmd *cobra.Command, args []string) {
fmt.Println("Welcome to rootcmd")
var mc Myconfig
if err := viper.Unmarshal(&mc); err != nil {
fmt.Println(err)
}
fmt.Println(mc)
fmt.Println("I can print this ", viper.AllSettings())
},
}
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
fmt.Println("I can print this ", viper.AllSettings())
}
func init() {
cobra.OnInitialize(initConfig)
// Here you will define your flags and configuration settings.
// Cobra supports persistent flags, which, if defined here,
// will be global for your application.
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.cobra-viper.json)")
//rootCmd.PersistentFlags().StringVar(&author, "author", "YOUR NAME", "Author name for copyright attribution")
// Cobra also supports local flags, which will only run
// when this action is called directly.
//rootCmd.Flags().BoolP("toggle", "t", false, "Help message for toggle")
//viper.BindPFlag("author", rootCmd.PersistentFlags().Lookup("author"))
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
if cfgFile != "" {
// Use config file from the flag.
viper.SetConfigFile(cfgFile)
} else {
// Find home directory.
home, err := homedir.Dir()
if err != nil {
fmt.Println(err)
os.Exit(1)
}
// Search config in home directory with name ".cobra-viper" (without extension).
viper.AddConfigPath(home)
viper.SetConfigName(".cobra-viper")
}
viper.AutomaticEnv() // read in environment variables that match
// If a config file is found, read it in.
if err := viper.ReadInConfig(); err == nil {
fmt.Println("Using config file:", viper.ConfigFileUsed())
}
}
输出:
~/Documents/personal-git/100-days-of-code/golang/d6-cobra-viper-continued(main*) » go run main.go
Using config file: /Users/parth/.cobra-viper.json
Welcome to rootcmd
{}
I can print this map[username:parth-wadhwa]
I can print this map[username:parth-wadhwa]
I can print this map[username:parth-wadhwa]
{}
JSON 文件:
~/Documents/personal-git/100-days-of-code/golang/d6-cobra-viper-continued(main*) » cat /Users/parth/.cobra-viper.json
{
"username": "parth-wadhwa"
}
您的问题归结为一个事实,即 MyConfig
结构中的 username
字段是否导出。它需要大写才能“导出”,以便 Unmarshal
将值解码到结构中。
type Myconfig struct {
Username string `mapstructure:"username"`
}
您可以查看 JSON and dealing with unexported fields 以了解更多有关 json
包为何需要它的信息。