Golang learning Web application development based on Prestashop

In recent years, the Golang language has gradually become popular in the field of web application development. This is because Golang has the advantages of high concurrency, high performance and easy deployment. Therefore, many developers start to use Golang to build their own web applications.

Prestashop is an open source e-commerce platform. It has rich functions and scalability to meet the needs of different types of e-commerce websites. In this article, we will explore how to use Golang to build a Prestashop based web application.

Before starting, you need to install Prestashop and Golang development environment. I won’t go into details here. Detailed installation instructions can be obtained through official documents.

Step 1: Create a Prestashop module

First, we need to create a module in Prestashop. Modules are a basic concept in Prestashop and can be used to extend the functionality of Prestashop.

In the module directory of Prestashop, create a new folder named "golangmodule". In that folder, create a file called "golangmodule.php" that contains the necessary module configuration information. The code is as follows:

<?php
if (!defined('_PS_VERSION_')) {
    exit;
}

class Golangmodule extends Module
{
    public function __construct()
    {
        $this->name = 'golangmodule';
        $this->tab = 'others';
        $this->version = '1.0.0';
        $this->author = 'yourname';
        $this->need_instance = 0;

        parent::__construct();

        $this->displayName = $this->l('Golang Module');
        $this->description = $this->l('This module allows you to integrate Golang into Prestashop.');
    }
}

In the above code, we define a module named "Golang Module" and add some basic information. Next, we need to add some custom functionality to the module.

Step 2: Use Golang to write custom functions

In Prestashop, you can add custom functions through modules. In this example, we will write a custom function by using Golang language.

First, you need to create a "golang" folder in the module directory and create a file named "main.go" in it. In this file, we will write a simple Golang program that imports data from the database into Prestashop.

The code is as follows:

package main

import (
    "database/sql"
    "fmt"
    "log"

    _ "github.com/go-sql-driver/mysql"
)

func main() {
    //连接到MySQL数据库
    db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/database")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    //查询数据库中的数据
    rows, err := db.Query("SELECT id, name, price FROM products")
    if err != nil {
        log.Fatal(err)
    }
    defer rows.Close()

    //将查询结果导入到Prestashop中
    for rows.Next() {
        var id int
        var name string
        var price float64
        if err := rows.Scan(&id, &name, &price); err != nil {
            log.Fatal(err)
        }
        fmt.Printf("id: %d, name: %s, price: %f
", id, name, price)
    }
    if err := rows.Err(); err != nil {
        log.Fatal(err)
    }
}

In the above code, we used the go-sql-driver/mysql package to connect to the MySQL database and wrote a simple query program. In the query results, we output the id, name and price of each product.

Step 3: Integrate Golang program with Prestashop

A Golang-based program has been written to import data from the database into Prestashop. Next, you need to integrate the program with Prestashop in the module.

First, you need to create a file named "golangmodule.php" in the module directory. In this file, you need to add a function named "install()", which will perform the following operations:

1. Compile the Golang program into an executable file.
2. Create a new menu item for executing Golang programs.
3. Add the necessary permissions in Prestashop so that users can access the new menu items.

The code is as follows:

<?php
if (!defined('_PS_VERSION_')) {
    exit;
}

class Golangmodule extends Module
{
    public function __construct()
    {
        $this->name = 'golangmodule';
        $this->tab = 'others';
        $this->version = '1.0.0';
        $this->author = 'yourname';
        $this->need_instance = 0;

        parent::__construct();

        $this->displayName = $this->l('Golang Module');
        $this->description = $this->l('This module allows you to integrate Golang into Prestashop.');
    }

    public function install()
    {
        //将Golang程序编译为可执行文件
        exec("go build -o " . _PS_MODULE_DIR_ . "golangmodule/golang/golang " . _PS_MODULE_DIR_ . "golangmodule/golang/main.go");

        //创建新的菜单项
        $parentTabId = (int) Tab::getIdFromClassName('AdminParentModulesSf');
        $tab = new Tab();
        $tab->class_name = 'AdminGolangModule';
        $tab->id_parent = $parentTabId;
        $tab->module = $this->name;
        $tab->name[(int) Configuration::get('PS_LANG_DEFAULT')] = $this->l('Golang');
        $tab->add();

        //添加必要的权限
        $idTab = (int) Tab::getIdFromClassName('AdminGolangModule');
        $adminRoleId = (int) Tab::getRole((int) $idTab);
        $permissions = array(
            'View' => 1,
            'Configure' => 1,
        );
        $this->setModulePermissions($adminRoleId, $permissions);

        return parent::install();
    }

    private function setModulePermissions($idRole, $permissions)
    {
        //删除现有的权限
        Db::getInstance()->delete('module_access', 'id_profile = ' . (int) $idRole . ' AND id_module = ' . (int) $this->id);

        //添加新的权限
        foreach ($permissions as $key => $permission) {
            Db::getInstance()->insert('module_access', array(
                'id_profile' => (int) $idRole,
                'id_authorization_role' => 1,
                'id_module' => (int) $this->id,
                'view' => $key == 'View' ? (int) $permission : 0,
                'configure' => $key == 'Configure' ? (int) $permission : 0,
                'install' => 0,
                'uninstall' => 0,
            ));
        }
    }
}

In the above code, we have added a class named "AdminGolangModule", which will be used to display new menu items.

Next, you need to create a file called "AdminGolangModule.php" and place it in the module's "admin" folder. In this file, we will write a simple controller that executes a Golang program and outputs the results to the screen.

The code is as follows:

<?php
class AdminGolangModuleController extends ModuleAdminController
{
    public function __construct()
    {
        parent::__construct();

        $this->bootstrap = true;
    }

    public function initContent()
    {
        parent::initContent();

        //执行Golang程序
        exec(_PS_MODULE_DIR_ . "golangmodule/golang/golang 2>&1", $output, $result);

        //将输出结果添加到模板中
        $this->context->smarty->assign(array(
            'golang_output' => implode("
", $output),
        ));

        //显示模板
        $this->setTemplate('module:golangmodule/views/templates/admin/golang.tpl');
    }
}

In the above code, we add the output of the Golang program to the template and display the template on the screen.

Step 4: Run the application

Now, we have completed the development of the Prestashop based web application. Next, please follow the steps below to run the application:

1. In the backend of Prestashop, go to the "Module" menu and find the module "Golang Module" we just created.
2. Click the "Install" button to install the module. After the installation is complete, you will see a new menu item "Golang" in Prestashop's menu.
3. Click the "Golang" menu to execute the Golang program we just wrote and display the output on the screen.

In the above example, we write the Golang program as a stand-alone executable file and use the exec() function to execute the file. In fact, you can also embed a web server in a Golang program to run the program directly in Prestashop.

The above is a simple example of web application development based on Prestashop. Of course, we can use Golang to develop more complex applications and integrate various functions of Prestashop into them. I believe that through studying this article, you have a deeper understanding of web application development based on Prestashop.

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