Examples of how to perform request parameter verification in Golang

Golang is a popular programming language in recent years. Its emergence has made it easier for programmers to develop, improved development efficiency, and also has efficient and stable features. In Golang, parameter verification is an important and common problem. This article will introduce how to perform request parameter verification in Golang, allowing us to develop more efficient and stable applications.

1. Common scenarios

During development, it is often necessary to verify request parameters based on actual needs. For example, we need to verify whether the request parameter is an email address, or we need to verify whether the request parameter conforms to the format of the ID number. There are some other scenarios, such as needing to verify whether the request parameter is empty or the value range, etc.

2. Traditional parameter verification method

In the traditional parameter verification method, we usually use manual judgment to determine whether the parameters meet the requirements. For example, we can use regular expressions to verify the format of email addresses or ID numbers. However, the method of manually verifying parameters is not only time-consuming and labor-intensive, but also not flexible enough to meet the actual needs of various needs.

3. Parameter verification library

In order to solve the problems of traditional parameter verification methods, some programmers have developed various parameter verification libraries. These validation libraries support a variety of parameter validation scenarios, such as validating parameters of string, number, date, etc. types. At the same time, they also provide configurable verification functions, allowing us to customize verification rules.

4.gopkg.in/go-playground/validator.v9

In Golang, we can use the verification library gopkg.in/go-playground/validator.v9. This library provides some basic verification functions, such as verifying numerical range, whether it is empty, etc., and also supports custom verification functions. The following is an example:

type User struct {
  Name string `json:"name" validate:"required"`
  Age  int    `json:"age" validate:"gte=0,lte=130"`
}

func CreateUser(w http.ResponseWriter, r *http.Request) {
  decoder := json.NewDecoder(r.Body)
  var user User
  err := decoder.Decode(&user)
  if err != nil {
    http.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
    return
  }
  validate := validator.New()
  err = validate.Struct(user)
  if err != nil {
    http.Error(w, err.Error(), http.StatusBadRequest)
    return
  }
  // 如果参数校验通过，继续后面的逻辑
}

In this example, we define a structure named User, which contains two fields: Name and Age. In this example, Name is required and Age ranges from 0 to 130. When the parameters in the request body do not meet the above requirements, a verification error will return BadRequest. When the parameter verification is successful, the code will continue to execute business logic processing. This is the core role of parameter verification.

5. Summary

This article introduces the method of request parameter verification in Golang. Through parameter verification, we can effectively ensure the correctness of business logic and reduce business risks caused by non-standard parameters. I hope this article will be helpful to Golang development.

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