feat: add request id to logs

To enhance debugging experience each logged line should contain id for
current request. With such format it will be easier to identify all
messages coming from single request. Having id enables `grep`-friendly
output.

Signed-off-by: Bart Jaskulski <bartek.jaskulski@wpdesk.net>

src/SimpleLoggerFactory.php

@@ -3,6 +3,7 @@ declare( strict_types=1 );
 
 namespace WPDesk\Logger;
 
+use Monolog\Formatter\LineFormatter;
 use Monolog\Handler\HandlerInterface;
 use Monolog\Handler\NullHandler;
 use Monolog\Logger;
@@ -33,19 +34,21 @@ final class SimpleLoggerFactory implements LoggerFactory {
 		$logger = new Logger( $this->channel );
 
 		if ( $this->options->use_wc_log && \function_exists( 'wc_get_logger' ) ) {
-			$logger->pushHandler(
-				new WooCommerceHandler(
-					\wc_get_logger(),
-					$this->channel
-				)
-			);
+			$handler = new WooCommerceHandler( \wc_get_logger(), $this->channel );
 		}
 
 		// Adding WooCommerce logger may have failed, if so add WP by default.
 		if ( $this->options->use_wp_log || empty( $logger->getHandlers() ) ) {
-			$logger->pushHandler( $this->get_wp_handler() );
+			$handler = $this->get_wp_handler();
 		}
 
+		$request_id = uniqid('', true);
+		$handler->setFormatter(
+			new LineFormatter( "[%datetime%] %channel%.%level_name%: %message% %context% %extra%, requestId: $request_id" )
+		);
+
+		$logger->pushHandler( $handler );
+
 		return $this->logger = $logger;
 	}