FileStoreException

Overview

FileStoreException is a custom exception class in the Midnite81\Guardian package. This exception is thrown when there are issues related to file operations within the FileStore class, which is one of the storage options for the Guardian rate limiting system.

Class Details

• Namespace: Midnite81\Guardian\Exceptions\Store

• Extends: StoreException

Purpose

The primary purpose of this exception is to provide specific error handling for file-related issues that may occur when Guardian is using the filesystem for storing rate limiting data. It helps distinguish file-specific errors from other types of storage errors in the Guardian system.

Usage

This exception is typically thrown by the FileStore class when it encounters issues with file operations such as:

• Failed file creation or deletion

• Permission issues

• Disk space problems

• JSON encoding or decoding errors

Example of where this exception might be thrown (inside FileStore):

try {
    $jsonData = json_encode($data, JSON_THROW_ON_ERROR);
} catch (JsonException $e) {
    throw new FileStoreException($e->getMessage(), $e->getCode(), $e);
}

$result = $this->system->filePutContents($filename, $jsonData);
if ($result === false) {
    throw new FileStoreException("Failed to write cache file: $filename");
}

Catching and Handling

When using Guardian with a file store, you should be prepared to catch and handle this exception:

use Midnite81\Guardian\Exceptions\Store\FileStoreException;

try {
    // Your Guardian code using FileStore
    $guardian->send(function() {
        // Your rate-limited code here
    });
} catch (FileStoreException $e) {
    // Log the error
    error_log("File storage error in Guardian: " . $e->getMessage());
    
    // Gracefully degrade or use a fallback mechanism
    // For example, you might choose to allow the request in case of storage errors
    return true;
}

Best Practices

1. Always catch this exception when using Guardian with a FileStore.

2. Log the exception details for debugging and monitoring purposes.

3. Implement appropriate fallback mechanisms or graceful degradation when file operations fail.

4. Regularly check and manage disk space to prevent storage-related issues.

5. Ensure proper file permissions are set for the directory used by FileStore.

Error Messages

The error messages for this exception will typically include details about the specific file operation that failed. These can include:

• File write or read failures

• Directory creation issues

• JSON parsing errors

For example:

Failed to write cache file: /path/to/cache/file.json

or

Failed to create cache directory: /path/to/cache

Integration with Guardian

This exception is an integral part of Guardian's error handling system for file-based storage. It allows the system to differentiate between different types of storage errors and provide more specific error handling and reporting.

Security Considerations

When handling FileStoreException, be careful not to expose sensitive file system information or paths in user-facing error messages. Always log the full exception details securely, but provide only general error messages to end-users.

Troubleshooting

If you frequently encounter FileStoreException:

1. Check file and directory permissions for the cache storage location.

2. Ensure there's sufficient disk space available.

3. Verify that the PHP process has write access to the cache directory.

4. Check for any file locking issues that might prevent writing or reading.

5. Consider using a different storage mechanism (like Redis or database storage) if file system issues persist.

Performance Implications

While file-based storage can be effective, it may not be as performant as in-memory solutions like Redis for high-traffic applications. Monitor the frequency of file operations and consider alternative storage methods if performance becomes an issue.

By properly handling FileStoreException, you can ensure that your application gracefully manages file-related issues in the Guardian rate limiting system, maintaining reliability even when file operations fail. This exception helps in identifying and addressing filesystem-related problems quickly, ensuring the stability of your rate limiting implementation.