Swoole practice: how to implement high concurrency access control strategy

With the continuous development of Internet technology, access control strategies have become more and more important, but high-concurrency real-time control is a more difficult problem. In order to solve this problem, many people began to use Swoole technology to implement high-concurrency access control strategies.

Swoole is a high-performance network communication framework based on PHP language. It supports asynchronous IO, coroutine, multi-process, multi-thread and other features, and can be used with common web servers such as Nginx and Apache. Due to its excellent performance and ease of use, more and more companies and developers choose to use Swoole to develop high-concurrency applications.

So, how to implement high-concurrency access control strategy using Swoole? Below we will introduce it in two parts.

1. Use Swoole to achieve high concurrent IP restricted access

IP restricted access is a common access control strategy, usually used to limit the number of accesses to certain IP addresses to avoid malicious intent. attack or other unforeseen circumstances. Using Swoole to achieve high-concurrency IP restricted access mainly includes the following steps:

1. Use Swoole to create an asynchronous HTTP server.

When creating a Swoole HTTP server, you need to specify the server's IP and port number. In addition, other configurations of the server need to be set, such as the value of the worker_num configuration item.

2. Set access restriction policy.

In Swoole's onRequest callback function, you can write code to restrict access. A common approach is to use PHP's session mechanism to record the IP addresses that have been visited and the number of visits, and to intercept or otherwise handle IP addresses that exceed the limit.

3. For requests that have been intercepted, return the specified response result.

When the IP address is restricted, the request needs to be intercepted or the specified response result needs to be returned. Normally, you can use Swoole's response object to return response results, such as setting HTTP status code and response content.

2. Use Swoole to limit the number of concurrent requests with high concurrency

In addition to IP restriction access, some applications also need to limit the number of concurrent requests to avoid server failure due to too many concurrent requests. collapse. Using Swoole to achieve high concurrency and limiting the number of concurrent requests can be divided into the following steps:

1. Use Swoole to create a multi-process service.

In order to achieve high concurrency limit on the number of concurrent requests, Swoole's process management mechanism needs to be used. Because PHP itself is single-threaded and has no way to handle multiple concurrent requests, it is necessary to use the Swoole multi-process service to implement concurrent requests.

2. Use Swoole's coroutine technology for processing.

In Swoole's multi-process service, coroutine technology can be used to handle concurrent requests. Coroutines are lightweight threads that can be switched within the same process to achieve concurrent processing.

3. Set the number of concurrent processing.

In the processing of coroutines, the number of concurrent processing needs to be set to prevent excessive occupation of resources. You can use the semaphore semaphore mechanism provided by Swoole to limit concurrent requests.

Summary

Using Swoole to implement high-concurrency access control policies can help developers better cope with complex network environments and improve application performance and reliability. In actual applications, it is necessary to select appropriate strategies based on specific application scenarios and continuously optimize performance to achieve better user experience and higher application quality.

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