RoadRunner PSR Logger

A PSR-3 compatible logger implementation that integrates with RoadRunner's logging system via RPC calls. This package provides a bridge between PSR-3 logging standards and RoadRunner's centralized logging infrastructure.

RPC Logger vs STDERR Logger

The RPC logger provides several advantages over RoadRunner's built-in STDERR Logger:

• Log Level Control: RPC Logger controls the actual log level sent to RoadRunner server, ensuring proper level filtering and display in RoadRunner logs. Messages from STDERR Logger are processed by RoadRunner with info level.
• Context Support: RPC logger preserves structured context data (arrays, objects). STDERR Logger outputs only the message string, ignoring context.

Installation

composer require roadrunner/psr-logger

Usage

Basic Setup

use RoadRunner\Logger\Logger as AppLogger;
use RoadRunner\PsrLogger\RpcLogger;

// Initialize the RoadRunner app logger
$rpc = \Spiral\Goridge\RPC\RPC::create('127.0.0.1:6001');
$appLogger = new AppLogger($rpc);

// Create the PSR-3 compatible logger
$logger = new RpcLogger($appLogger);

Logging Examples

// Basic logging with different levels
$logger->emergency('System is unusable');
$logger->alert('Action must be taken immediately');
$logger->critical('Critical conditions');
$logger->error('Runtime errors');
$logger->warning('Warning conditions');
$logger->notice('Normal but significant condition');
$logger->info('Informational messages');
$logger->debug('Debug-level messages');

// Logging with context data
$logger->info('User logged in', [
    'user_id' => 123,
    'ip_address' => '192.168.1.1',
    'user_agent' => 'Mozilla/5.0...'
]);

// Using the generic log method
$logger->log(\Psr\Log\LogLevel::ERROR, 'Something went wrong', [
    'exception' => $exception->getMessage(),
    'trace' => $exception->getTraceAsString()
]);

Log Levels

Supported Log Level Types

The logger accepts log levels in multiple formats:

• String values: 'error', 'warning', 'info', 'debug'
• PSR-3 constants: \Psr\Log\LogLevel::ERROR, \Psr\Log\LogLevel::WARNING
• Stringable objects: Any object implementing \Stringable interface
• BackedEnum values: PHP 8.1+ backed enums with string values

// String levels
$logger->log('error', 'Error message');

// PSR-3 constants
$logger->log(\Psr\Log\LogLevel::WARNING, 'Warning message');

// BackedEnum example
enum LogLevel: string
{
    case Error = 'error';
    case Warning = 'warning';
    case Info = 'info';
    case Debug = 'debug';
}

$logger->log(LogLevel::Error, 'Error via enum');

Log Level Mapping

The logger maps PSR-3 log levels to RoadRunner logging methods as follows:

PSR-3 Level	RoadRunner Method
emergency	error
alert	error
critical	error
error	error
warning	warning
notice	info
info	info
debug	debug

Context Handling

The logger supports structured logging with context arrays. Context data is processed by a context processor before being passed to the underlying RoadRunner logger.

Default Context Processor

By default, RpcLogger uses DefaultProcessor which can handle:

• Scalar values (string, int, float, bool)
• Arrays and nested arrays
• Resources (converted to resource type description)
• Objects via built-in object processors:
  • DateTimeProcessor: Converts \DateTimeInterface objects to ISO 8601 format (ATOM)
  • StringableProcessor: Converts \Stringable objects to their string representation
  • ThrowableProcessor: Converts exceptions/errors to structured arrays with class, message, code, file, line, and trace
  • FallbackProcessor: Converts any other objects to arrays with class name and public properties

$logger->info('Order processed', [
    'order_id' => 12345,
    'customer' => [
        'id' => 67890,
        'email' => 'customer@example.com'
    ],
    'amount' => 99.99,
    'processed_at' => new \DateTime(),
    'metadata' => [
        'source' => 'web',
        'campaign' => 'summer_sale'
    ]
]);

Extending DefaultProcessor

The recommended approach is to extend DefaultProcessor with custom object processors using the withObjectProcessors() method. This allows you to add your own object handling while keeping all the built-in processors.

/**
 * @implements ObjectProcessor<ActiveRecord>
 */
class EntityProcessor implements ObjectProcessor
{
    public function canProcess(object $value): bool
    {
        return $value instanceof ActiveRecord;
    }

    public function process(object $value, callable $processor): mixed
    {
        return $processor($value->toArray());
    }
}

// Extend default processor with your custom processor
$processor = DefaultProcessor::createDefault()
    ->withObjectProcessors(new EntityProcessor());

$logger = new RpcLogger($appLogger, $processor);

// Now entity objects will be automatically converted to arrays with essential data
$logger->info('Order created', [
    'user' => $user,     // User entity instance
    'order' => $order,   // Order entity instance
]);

Note

Custom processors added via withObjectProcessors() are placed before the built-in processors. This means your custom processors take precedence and can override the default behavior for specific object types.

// Add multiple custom processors at once
$processor = DefaultProcessor::createDefault()
    ->withObjectProcessors(
        new EntityProcessor(),
        new MoneyProcessor(),
        new CustomValueObjectProcessor(),
    );

$logger = new RpcLogger($appLogger, $processor);

You can also start with an empty processor and add only the processors you need:

use RoadRunner\PsrLogger\Context\ObjectProcessor\DateTimeProcessor;

// Create empty processor and add only specific processors
$processor = DefaultProcessor::create()
    ->withObjectProcessors(
        new DateTimeProcessor(),
        new EntityProcessor()
    );

$logger = new RpcLogger($appLogger, $processor);

Custom Context Processor

For advanced use cases, you can provide a completely custom context processor to the RpcLogger constructor:

use RoadRunner\Logger\Logger as AppLogger;
use RoadRunner\PsrLogger\RpcLogger;

// Using a completely custom processor
$customProcessor = function (mixed $context): mixed {
    // Your custom processing logic
    return $context;
};
$logger = new RpcLogger($appLogger, $customProcessor);