How to build a caching proxy server using PHP and REDIS

How to build a cache proxy server using PHP and Redis

Caching is a technology that effectively improves system performance. In web development, using a caching proxy server is a common optimization method. This article will introduce how to build a caching proxy server using PHP and Redis, with code examples.

1. Installing and configuring Redis

First, you need to install Redis on the server. You can install it through the following command:

sudo apt-get install redis-server

After the installation is complete, you need to perform some configuration on Redis. You can edit the /etc/redis/redis.conf file and modify the following two configuration items:

bind 127.0.0.1
maxmemory 128mb

Change the bind configuration item to the IP address of the server, and maxmemory Modify the configuration item to an appropriate value (depending on the memory of the server).

2. Writing PHP code

Next, let’s write PHP code to implement the function of the caching proxy server. First create a ProxyServer.php file, and then add the following code:

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$cacheKey = md5($_SERVER['REQUEST_URI']);

$cachedResponse = $redis->get($cacheKey);

if ($cachedResponse) {
    echo $cachedResponse;
} else {
    // Your original logic here

    // Get the response from the upstream server
    $response = get_response_from_upstream_server();

    // Store the response in Redis with a TTL of 1 hour
    $redis->setex($cacheKey, 3600, $response);

    echo $response;
}
?>

In the above code, we first use the Redis PHP extension to connect to the Redis server. We then calculate a unique cache key $cacheKey based on the currently requested URL. Next, we try to get the cached response from Redis. If it exists, the cached response is returned directly; otherwise, custom logic is executed, the response is obtained from the upstream server, and the response is stored in Redis, setting the expiration time to 1 hour. .

It should be noted that in the above code, get_response_from_upstream_server() is a custom method in which you can write the logic implementation of sending requests to the upstream server and obtaining responses.

3. Configure the Web server

Finally, modify the configuration file of the Web server (such as Nginx or Apache) to forward the request to the caching proxy server we wrote.

For example, in Nginx, you can add the following code in the nginx.conf file or the corresponding virtual host configuration file:

server {
    listen 80;
    server_name example.com;

    location / {
        proxy_pass http://127.0.0.1:8080;
    }
}

In the above code, ## The #proxy_pass directive forwards the request to the caching proxy server, whose address is http://127.0.0.1:8080.

Test

https://redis.io/download
• https://www.php.net/manual/en/book.redis .php
• https://nginx.org/

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