How to Read Slices of Maps from Configuration Files Using Golang Viper?-Golang-php.cn

How to Read Slices of Maps from Configuration Files Using Golang Viper?

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Release： 2024-11-26 04:46:22

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How to Read Slices of Maps from Configuration Files Using Golang Viper?

Reading Slices of Maps with Golang Viper

The Viper library is an excellent tool for reading and managing configuration data in Go. One common challenge users face is reading a slice of maps from a configuration file.

Consider the following HCL configuration file:

interval = 10
statsd_prefix = "pinger"

group "dns" {
  target_prefix = "ping"
  target "dns" {
    hosts = [
      "dnsserver1",
      "dnsserver2"
    ]
  }
}

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To read this configuration file with Viper, you can use the following code:

type config struct {
    Interval      int     `mapstructure:"interval"`
    StatsdPrefix  string  `mapstructure:"statsd_prefix"`
    Groups       []group `mapstructure:"group"`
}

type group struct {
    Name         string  `mapstructure:"group"`
    TargetPrefix string  `mapstructure:"target_prefix"`
    Targets      []target `mapstructure:"target"`
}

type target struct {
    Name   string   `mapstructure:"target"`
    Hosts  []string `mapstructure:"hosts"`
}

func main() {
    viper.SetConfigName("config")
    viper.AddConfigPath(".")

    err := viper.ReadInConfig()
    if err != nil {
        panic(err)
    }

    var c config
    err = viper.Unmarshal(&c)
    if err != nil {
        panic(err)
    }

    fmt.Println(c.Interval)
    fmt.Println(c.StatsdPrefix)

    fmt.Println("Groups:")
    for _, group := range c.Groups {
        fmt.Println("- Name:", group.Name)
        fmt.Println("  - Prefix:", group.TargetPrefix)

        fmt.Println("  - Targets:")
        for _, target := range group.Targets {
            fmt.Println("    - Name:", target.Name)
            fmt.Println("      - Hosts:")
            for _, host := range target.Hosts {
                fmt.Println("        - ", host)
            }
        }
    }
}

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By defining Go structures to match the configuration file, Viper can automatically decode and map the configuration data to the correct types. This simplifies working with complex data structures and provides a type-safe way to access configuration values.

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