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wp-content/plugins/gravitysmtp/includes/routing/class-routing-service-provider.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Routing;
+
+use Gravity_Forms\Gravity_SMTP\Connectors\Connector_Service_Provider;
+use Gravity_Forms\Gravity_SMTP\Logging\Logging_Service_Provider;
+use Gravity_Forms\Gravity_SMTP\Routing\Handlers\Primary_Backup_Handler;
+use Gravity_Forms\Gravity_Tools\Service_Container;
+use Gravity_Forms\Gravity_Tools\Service_Provider;
+
+class Routing_Service_Provider extends Service_Provider {
+
+	const PRIMARY_BACKUP_HANDLER = 'primary_backup_handler';
+
+	const HOOK_PRIORITY_PRIMARY_BACKUP = 10;
+
+	public function register( Service_Container $container ) {
+		$container->add( self::PRIMARY_BACKUP_HANDLER, function() use ( $container ) {
+			return new Primary_Backup_Handler( $container->get( Connector_Service_Provider::DATA_STORE_ROUTER ), $container->get( Logging_Service_Provider::DEBUG_LOGGER ) );
+		});
+	}
+
+	public function init( Service_Container $container ) {
+		add_filter( 'gravitysmtp_connector_for_sending', function( $current_connector, $email_args ) use ( $container ) {
+			if ( $current_connector ) {
+				return $current_connector;
+			}
+			return $container->get( self::PRIMARY_BACKUP_HANDLER )->handle( $current_connector, $email_args );
+		}, self::HOOK_PRIORITY_PRIMARY_BACKUP, 2 );
+
+		add_action( 'gravitysmtp_before_email_send', function() use ( $container ) {
+			$container->get( self::PRIMARY_BACKUP_HANDLER )->reset();
+		}, 0 );
+	}
+
+}

wp-content/plugins/gravitysmtp/includes/routing/handlers/class-primary-backup-handler.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Routing\Handlers;
+
+use Gravity_Forms\Gravity_SMTP\Connectors\Connector_Base;
+use Gravity_Forms\Gravity_SMTP\Data_Store\Data_Store_Router;
+use Gravity_Forms\Gravity_SMTP\Enums\Connector_Status_Enum;
+use Gravity_Forms\Gravity_SMTP\Logging\Debug\Debug_Logger;
+
+class Primary_Backup_Handler implements Routing_Handler {
+
+	private static $primary_attempted = false;
+	private static $backup_attempted  = false;
+
+	/**
+	 * @var Data_Store_Router
+	 */
+	protected $data_router;
+
+	/**
+	 * @var Debug_Logger
+	 */
+	protected $logger;
+
+	public function __construct( $data_router, $logger ) {
+		$this->data_router = $data_router;
+		$this->logger = $logger;
+	}
+
+	private function error_prefix() {
+		return sprintf( '%s:: ', str_replace( __NAMESPACE__, '', __CLASS__ ) );
+	}
+
+	public function reset() {
+		self::$primary_attempted = false;
+		self::$backup_attempted  = false;
+	}
+
+	public function handle( $current_connector, $email_data ) {
+
+		// A backup was already attempted; no more connections to check, return false.
+		if ( self::$backup_attempted ) {
+			$this->logger->log_warning( $this->error_prefix() . __( 'Primary and Backup integrations failed to send. Aborting email send.', 'gravitysmtp' ) );
+			return false;
+		}
+
+		// We've tried the primary connection, now look for a backup connection.
+		if ( self::$primary_attempted ) {
+			self::$backup_attempted = true;
+			$type                   = $this->data_router->get_connector_status_of_type( Connector_Status_Enum::BACKUP );
+
+			if ( ! $type ) {
+				$this->logger->log_warning( $this->error_prefix() . __( 'Backup integration not set, aborting email send.', 'gravitysmtp' ) );
+				return false;
+			}
+
+			$enabled = $this->data_router->get_setting( $type, Connector_Base::SETTING_ENABLED, false );
+
+			/* translators: %1$s: integration type */
+			$this->logger->log_debug( $this->error_prefix() . sprintf( __( 'Secondary integration identified: %1$s', 'gravitysmtp' ), $type ) );
+
+			if ( $enabled ) {
+				return $type;
+			}
+
+			$this->logger->log_debug( $this->error_prefix() . __( 'Secondary integration not enabled. Skipping.', 'gravitysmtp' ) );
+
+			return false;
+		}
+
+		// This is the first call, so attempt to use the primary connection.
+		self::$primary_attempted = true;
+		$type                    = $this->data_router->get_connector_status_of_type( Connector_Status_Enum::PRIMARY );
+
+		if ( ! $type ) {
+			$this->logger->log_warning( $this->error_prefix() . __( 'Primary integration not set, checking for Backup integration.', 'gravitysmtp' ) );
+			return $this->handle( $type, $email_data );
+		}
+
+		$enabled = $this->data_router->get_setting( $type, Connector_Base::SETTING_ENABLED, false );
+
+		/* translators: %1$s: integration type */
+		$this->logger->log_debug( $this->error_prefix() . sprintf( __( 'Primary integration identified: %1$s', 'gravitysmtp' ), $type ) );
+
+		// Primary connection not enabled; immediately try backup connection.
+		if ( ! $enabled ) {
+			$this->logger->log_warning( $this->error_prefix() . __( 'Primary integration not enabled, moving on to Backup integration.', 'gravitysmtp' ) );
+			return $this->handle( $type, $email_data );
+		}
+
+		// Primary connection found and is enabled.
+		return $type;
+	}
+
+}

wp-content/plugins/gravitysmtp/includes/routing/handlers/interface-routing-handler.php

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+<?php
+
+namespace Gravity_Forms\Gravity_SMTP\Routing\Handlers;
+
+interface Routing_Handler {
+
+	/**
+	 * Handle the routing callback from gravitysmtp_connector_for_sending
+	 *
+	 * @param string $current_connector The current connector chosen for sending.
+	 * @param array  $email_data        The data for the current email.
+	 *
+	 * @return string The connector to use for the email.
+	 */
+	public function handle( $current_connector, $email_data );
+
+}