How to make spider pool in thinkphp

With the development of the Internet, crawler (spider) technology is becoming more and more important. Whether it is search engines or data mining, crawler technology is required to search, collect and extract web data. In this process, the application of spider pool (SpiderPool) is becoming more and more widespread. This article will introduce how to use ThinkPHP to build a spider pool.

1. What is a spider pool

First of all, let us understand what a spider pool is. The spider pool is a crawler manager that manages the running of multiple crawlers, allocates multiple crawlers to different tasks, and improves the efficiency and stability of crawlers.

The main functions of the spider pool:

1. Concurrency control: Control the number of crawlers running at the same time to prevent the server from crashing due to overload.

2. Proxy pool management: Management of proxy servers to protect crawlers from being banned.

3. Task allocation: Assign multiple crawlers to different tasks to improve the efficiency and stability of the crawlers.

4. Task monitoring: monitor the running status of each task, discover problems and deal with them in time.

2. Construction of spider pool

1. Environment preparation

First of all, before preparing to start building the spider pool, you need to ensure that the following environment is ready:

1. PHP5.4 or above;

2. MySQL database;

3. Composer package management tool.

2. Install ThinkPHP

To install the ThinkPHP framework, you can use Composer to install it. Just use the following command:

composer create-project topthink/think

3. Create a database table

In MySQL, create a database, such as "spider_pool", and then create a data table named "sp_pool" to store crawler information. The structure of the table is as follows:

CREATE TABLE sp_pool (
id int(11) unsigned NOT NULL AUTO_INCREMENT,
name varchar(255) DEFAULT NULL,
status tinyint(1) DEFAULT '0',
create_time int(11) DEFAULT NULL,
update_time int(11) DEFAULT NULL,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

4. Write the controller

Next, write a controller to control the functions of the spider pool. The following file can be created: application/index/controller/SpiderPool.php.

In the controller, you need to write the following methods:

1, index

This method is used to display the list of crawler pools. Query the information of all crawlers in the database and display it on the page.

public function index()
{

$list = Db::name('sp_pool')->select();
return json($list);

}

2. add

This method is used to add a new crawler to the pool. When adding a task, you need to specify information such as the task name and URL.

public function add()
{

$request = Request::instance();
$sp_name = $request->post('name');
$sp_status = $request->post('status');
$sp_create_time = time();
$sp_update_time = time();
$data = [
    'name' => $sp_name,
    'status' => $sp_status,
    'create_time' => $sp_create_time,
    'update_time' => $sp_update_time,
];
$result = Db::name('sp_pool')->insert($data);
if ($result) {
    return json(['msg' => 'success']);
} else {
    return json(['msg' => 'failure']);
}

}

3. update

This method is used to update crawler information, such as task name Or task status, etc.

public function update()
{

$request = Request::instance();
$sp_id = $request->post('id');
$sp_name = $request->post('name');
$sp_status = $request->post('status');
$sp_update_time = time();
$data = [
    'name' => $sp_name,
    'status' => $sp_status,
    'update_time' => $sp_update_time,
];
$result = Db::name('sp_pool')->where('id', $sp_id)->update($data);
if ($result) {
    return json(['msg' => 'success']);
} else {
    return json(['msg' => 'failure']);
}

}

4. delete

This method is used to delete the specified crawler from the pool.

public function delete()
{

$request = Request::instance();
$sp_id = $request->post('id');
$result = Db::table('sp_pool')->delete($sp_id);
if ($result) {
    return json(['msg' => 'success']);
} else {
    return json(['msg' => 'failure']);
}

}

5. Start the spider pool

The startup process of the spider pool can be placed in the system In a scheduled task, the spider pool is started every time the task is executed. Write the following script to start the spider pool:

namespace appindexcontroller;
use thinkController;
class Task extends Controller
{

public function spiderpool()
{
    $list = Db::name('sp_pool')->where('status', 0)->limit(1)->select();
    if (count($list) > 0) {
        $sp_name = $list[0]['name'];
        $sp_update_time = time();
        Db::name('sp_pool')->where('name', $sp_name)->update(['status' => 1, 'update_time' => $sp_update_time]);
        //启动爬虫任务

        Db::name('sp_pool')->where('name', $sp_name)->update(['status' => 0, 'update_time' => $sp_update_time]);
    }
}

}

3. Summary

Spider pool is a necessary tool for managing crawler tasks and can improve the efficiency and stability of crawlers. This article introduces how to use ThinkPHP to build a simple spider pool. Through this example, we can understand the excellent features of the ThinkPHP framework in building web applications. Although this article is just a simple example, it can provide some help for everyone to feel the usage and ideas of ThinkPHP.

The above is the detailed content of How to make spider pool in thinkphp. For more information, please follow other related articles on the PHP Chinese website!