Operation log of Redis in PHP applications

In PHP applications, using Redis as a solution for caching or storing data has become more and more common. Redis is a high-performance key-value storage database that is fast, scalable, highly available, and has diverse data structures. When using Redis, in order to better understand the operation of the application and for data security, we need to have a Redis operation log.

The Redis operation log can record all client operations on the Redis server, including read and write operations. For each operation on the Redis server, the Redis operation log records the operation time, client IP address, Redis command, operation results and other related information. This information can help us better understand all operations occurring on the Redis server and be able to locate and fix problems faster when problems occur.

Redis operation log records include the following aspects:

1. Operation time: record the timestamp of the operation performed by the Redis client.
2. Client IP address: Record the IP address of the Redis client to facilitate tracing the client when a problem occurs.
3. Redis command: Record the operation commands performed by the Redis client, including read commands and write commands.
4. Operation results: Record the results returned by the Redis server, including success and failure.
5. Operation data: Record the data operated by the Redis client, including read data and written data.

There are many ways to implement Redis operation logs. The most common way is to use the hook function and Lua script provided by Redis. Redis provides some commands, such as CLIENT LIST and MONITOR commands to obtain connection information and all operation information, but using these commands directly to record Redis operation logs will affect the performance of the Redis server. Therefore, hook functions and Lua scripts are generally added before/after the Redis command is executed to record the log of the operation.

The following is an example of using Redis hook function and Lua script to implement Redis operation log:

<?php
class RedisLogger
{
    // 注冊鉤子函數(shù)
    public static function register()
    {
        $redis = new Redis();
        $redis->connect('127.0.0.1', 6379);
        $redis->setOption(Redis::OPT_MONITOR_CALLBACK, [__CLASS__, 'log']);
        $redis->monitor();
    }

    // 鉤子函數(shù)，記錄Redis操作日志
    public static function log($redis, $command, $arguments)
    {
        $log = [
            'time' => time(),
            'client_ip' => $_SERVER['REMOTE_ADDR'],
            'command' => $command,
            'arguments' => $arguments,
            'result' => 'success',
        ];
        try {
            $result = $redis->get($arguments[0]);
            if ($result) {
                $log['data'] = $result;
            }
        } catch (Exception $e) {
            $log['result'] = 'failed';
        }
        $redis->lPush('redis_log', json_encode($log));
    }

    // 獲取Redis操作日志
    public static function getLogs($start = 0, $end = -1)
    {
        $redis = new Redis();
        $redis->connect('127.0.0.1', 6379);
        $logs = $redis->lRange('redis_log', $start, $end);
        return $logs;
    }
}

In the above code, we registered a hook function through the register() method, which is executed in Redis This hook function is called before any command and the command name and parameters are passed in. We recorded the operation time, client IP address, Redis command and operation result in the hook function, and recorded the log to a Redis list named "redis_log".

When calling the getLogs() method, we can get the "redis_log" list from Redis and return all values ??within the specified range. Through this method, we can view the latest Redis operation log at any point in time.

In PHP applications, recording Redis operation logs is a very important task. It can help us better understand the operation of the application and ensure data security. Through the above example, we can see how to use the hook function and Lua script provided by Redis to record the Redis operation log. It can help us better monitor the status of the Redis server and quickly locate and fix the problem when it occurs. , making our application more healthy and stable.

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