Example analysis: How to implement efficient structure coercion in Golang

Using the "github.com/mailru/easyjson" library, you can implement an efficient structure forced conversion method: install the library and use easyjson to generate the forced conversion code. After the code is generated, implement the MarshalJSON and UnmarshalJSON methods to complete the conversion of structure to JSON and JSON to structure. By using the generated code, the performance of forced transfer is greatly improved while ensuring the readability of the code.

How to implement efficient structure coercion in Golang

In the development of Go language, we often need to Type structures can be converted to each other. The traditional hard conversion method uses reflection, but this method will cause performance loss. This article will introduce an efficient structure coercion method, using the go generate tool to generate code, thereby avoiding the performance overhead caused by reflection.

Efficient structure strong transfer library

We first need to install an efficient structure strong transfer library: "github.com/mailru/easyjson". This library provides tools for generating forced code.

Code generation

The forced transfer code generated using easyjson is as follows:

package models

import (
    "github.com/mailru/easyjson/jwriter"
)

// MarshalJSON marshals the fields of Role to JSON.
func (r *Role) MarshalJSON() ([]byte, error) {
    w := jwriter.Writer{}
    r.MarshalEasyJSON(&w)
    return w.Buffer.BuildBytes(), w.Error
}

// MarshalEasyJSON marshals the fields of Role to JSON.
func (r *Role) MarshalEasyJSON(w *jwriter.Writer) {
    w.String(`{"id":`)
    w.Int64(r.ID)
    w.String(`,"name":`)
    w.String(r.Name)
    w.String(`,"description":`)
    w.String(r.Description)
    w.String(`,"created_at":`)
    w.String(r.CreatedAt.Format(`"2006-01-02T15:04:05"`))
    w.String(`,"updated_at":`)
    w.String(r.UpdatedAt.Format(`"2006-01-02T15:04:05"`))
    w.String(`}`)
}

// UnmarshalJSON unmarshals JSON data into the fields of Role.
func (r *Role) UnmarshalJSON(data []byte) error {
    r.ID = 0
    r.Name = ""
    r.Description = ""
    r.CreatedAt = time.Time{}
    r.UpdatedAt = time.Time{}
    return easyjson.Unmarshal(data, &r)
}

Practical case

The following is a practical case of using the forced conversion code generated by easyjson:

package main

import (
    "encoding/json"
    "fmt"

    "github.com/mailru/easyjson"
    models "github.com/your-name/your-project/models"
)

func main() {
    role := &models.Role{
        ID:          1,
        Name:        "admin",
        Description: "Administrator role",
    }

    // Encode to JSON using the generated MarshalJSON method
    jsonData, err := json.Marshal(role)
    if err != nil {
        fmt.Println("Error encoding JSON:", err)
        return
    }

    fmt.Println("JSON data:", string(jsonData))

    // Decode from JSON using the generated UnmarshalJSON method
    newRole := &models.Role{}
    if err := easyjson.Unmarshal(jsonData, newRole); err != nil {
        fmt.Println("Error decoding JSON:", err)
        return
    }

    fmt.Println("Decoded role:", newRole)
}

By using the code generated by easyjson, we can significantly improve the performance of the forced conversion of structures while maintaining the readability and maintainability of the code. .

The above is the detailed content of Example analysis: How to implement efficient structure coercion in Golang. For more information, please follow other related articles on the PHP Chinese website!