How to install and use Viper in golang

In recent years, the Golang programming language has become increasingly popular among programmers because of its efficient and concise coding style. When developing with Golang, we often introduce some open source libraries to reduce duplicate code. Viper is a popular open source library for reading and processing application configurations. This article will introduce how to install and use Viper.

1. Check whether Golang is installed

First make sure you have installed Golang on your computer. Please open a terminal and enter the following command:

go version

If the above command can output the Golang version, it means that you have installed Golang. If not, install Golang.

2. Install Viper

Before installing Viper, we need to install the Golang package manager go mod. Please use the following command to install go mod:

go get -u github.com/golang/dep/cmd/dep

After installing go mod, we can install Viper. Please use the following command to install Viper:

go get github.com/spf13/viper

After the installation is completed, we can use Viper in the Golang project.

3. Using Viper

Using Viper is very simple. We only need to import Viper into the project to read the data in the configuration file. The following is a sample code for using Viper to read a configuration file:

package main

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

func main() {
  // 设置配置文件路径
  viper.SetConfigFile("./config.toml")

  // 读取配置文件
  if err := viper.ReadInConfig(); err != nil {
    fmt.Println("Error reading config file, %s", err)
  } else {
    // 读取配置文件中key为port的值
    fmt.Println("port: ", viper.GetString("port"))
  }
}

In the above code, we first set the configuration file path through the SetConfigFile method. Then read the data in the configuration file through the ReadInConfig method, and finally use the GetString method to read the specific value in the configuration file.

4. Summary

Viper is a very useful open source library for reading and processing application configurations, which can greatly reduce our workload. In this article, we introduce how to install and use Viper, we hope it will be helpful to you. If you need more information, check out Viper's official documentation.

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