golang configuration conversion

With the wide application of Golang in the development field, more and more enterprises and developers are applying it to projects, realizing many efficient and reusable functions. In Golang development, it is often necessary to convert the format of configuration files. This article will introduce how to use Golang to convert common configuration file formats.

1. YAML conversion

YAML is a human-readable configuration language that is easy to understand and write. When developing with Golang, it is often necessary to convert YAML format configuration files into other formats, such as JSON, etc. The following is an example YAML configuration file:

database:
  host: localhost
  name: mydb
  port: 3306
  user: root
  password: password123

In order to convert the YAML configuration file to JSON format, you can use "yaml" and "json" in the Golang package for conversion. First you need to import these two packages:

import (
    "encoding/json"
    "gopkg.in/yaml.v2"
)

Then you can use the following code to convert the YAML file to JSON format:

package main

import (
    "encoding/json"
    "fmt"
    "gopkg.in/yaml.v2"
    "io/ioutil"
)

type Config struct {
    Database struct {
        Host     string `yaml:"host"`
        Name     string `yaml:"name"`
        Port     int    `yaml:"port"`
        User     string `yaml:"user"`
        Password string `yaml:"password"`
    } `yaml:"database"`
}

func main() {
    yamlFile, err := ioutil.ReadFile("config.yaml")
    if err != nil {
        panic(err)
    }

    var cfg Config
    err = yaml.Unmarshal(yamlFile, &cfg)
    if err != nil {
        panic(err)
    }

    jsonFile, err := json.Marshal(cfg)
    if err != nil {
        panic(err)
    }

    fmt.Println(string(jsonFile))
}

In the above code, we first define a structure "Config ”, used to map various fields in YAML files. The YAML file is then read and converted into a structure using the "Unmarshal" function, and finally the structure is converted into JSON format using the "Marshal" function.

2. INI Conversion

INI is a common configuration file format commonly used in Windows operating systems. When developing with Golang, it is often necessary to convert INI configuration files into other formats, such as JSON, etc. The following is an example INI configuration file:

[database]
host=localhost
name=mydb
port=3306
user=root
password=password123

In order to convert the INI configuration file to JSON format, you can use "ini" and "json" in the Golang package for conversion. First you need to import these two packages:

import (
    "encoding/json"
    "gopkg.in/ini.v1"
)

Then you can use the following code to convert the INI file into JSON format:

package main

import (
    "encoding/json"
    "fmt"
    "gopkg.in/ini.v1"
)

func main() {
    cfg, err := ini.Load("config.ini")
    if err != nil {
        panic(err)
    }

    section := cfg.Section("database")
    host := section.Key("host").String()
    name := section.Key("name").String()
    port, _ := section.Key("port").Int()
    user := section.Key("user").String()
    password := section.Key("password").String()

    m := make(map[string]interface{})
    m["database"] = map[string]interface{}{
        "host":     host,
        "name":     name,
        "port":     port,
        "user":     user,
        "password": password,
    }

    jsonFile, err := json.Marshal(m)
    if err != nil {
        panic(err)
    }

    fmt.Println(string(jsonFile))
}

In the above code, we first use the "Load" function to read INI file, and obtain the configuration of the "database" section through the "Section" function. Then the value of each configuration item is stored in a map object, and finally the map object is converted into JSON format.

3. TOML conversion

TOML is an easy-to-read and write configuration file format that is widely used in various projects. When developing with Golang, it is often necessary to convert TOML configuration files into other formats, such as JSON, etc. The following is an example TOML configuration file:

[database]
host = "localhost"
name = "mydb"
port = 3306
user = "root"
password = "password123"

In order to convert the TOML configuration file to JSON format, you can use "toml" and "json" in the Golang package for conversion. First you need to import these two packages:

import (
    "encoding/json"
    "github.com/BurntSushi/toml"
)

Then you can use the following code to convert the TOML file into JSON format:

package main

import (
    "encoding/json"
    "fmt"
    "github.com/BurntSushi/toml"
)

type Config struct {
    Database struct {
        Host     string `toml:"host"`
        Name     string `toml:"name"`
        Port     int    `toml:"port"`
        User     string `toml:"user"`
        Password string `toml:"password"`
    } `toml:"database"`
}

func main() {
    var cfg Config
    if _, err := toml.DecodeFile("config.toml", &cfg); err != nil {
        panic(err)
    }

    jsonFile, err := json.Marshal(cfg)
    if err != nil {
        panic(err)
    }

    fmt.Println(string(jsonFile))
}

In the above code, we first define a structure "Config ”, used to map various fields in TOML files. Then use the "DecodeFile" function to convert the TOML file into a structure, and finally use the "Marshal" function to convert the structure into JSON format.

The above is a brief introduction on how to use Golang to convert common configuration file formats. Hope this article is helpful to you.

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