Respect WP_REDIS_SCHEME for cluster connection (#546)

* Respect WP_REDIS_SCHEME for cluster connection

* Do the scheme as part of `build_cluster_connection_array`

* Copy logic to object-cache.php

Author: yatsukhnenko

includes/class-predis.php

@@ -206,13 +206,30 @@ protected function build_cluster_connection_array() {
         $cluster = array_values( WP_REDIS_CLUSTER );
 
         foreach ( $cluster as $key => $server ) {
-            $connection_string = parse_url( $server );
+            $components = parse_url( $server );
+
+            if ( ! empty( $components['scheme'] ) ) {
+                $scheme = $components['scheme'];
+            } elseif ( defined( 'WP_REDIS_SCHEME' ) ) {
+                $scheme = WP_REDIS_SCHEME;
+            } else {
+                $scheme = null;
+            }
 
-            $cluster[ $key ] = sprintf(
-                "%s:%s",
-                $connection_string['host'],
-                $connection_string['port']
-            );
+            if ( isset( $scheme ) ) {
+                $cluster[ $key ] = sprintf(
+                    '%s://%s:%d',
+                    $scheme,
+                    $components['host'],
+                    $components['port']
+                );
+            } else {
+                $cluster[ $key ] = sprintf(
+                    '%s:%d',
+                    $components['host'],
+                    $components['port']
+                );
+            }
         }
 
         return $cluster;

includes/object-cache.php

@@ -3027,13 +3027,30 @@ protected function build_cluster_connection_array() {
         $cluster = array_values( WP_REDIS_CLUSTER );
 
         foreach ( $cluster as $key => $server ) {
-            $connection_string = parse_url( $server );
+            $components = parse_url( $server );
 
-            $cluster[ $key ] = sprintf(
-                "%s:%s",
-                $connection_string['host'],
-                $connection_string['port']
-            );
+            if ( ! empty( $components['scheme'] ) ) {
+                $scheme = $components['scheme'];
+            } elseif ( defined( 'WP_REDIS_SCHEME' ) ) {
+                $scheme = WP_REDIS_SCHEME;
+            } else {
+                $scheme = null;
+            }
+
+            if ( isset( $scheme ) ) {
+                $cluster[ $key ] = sprintf(
+                    '%s://%s:%d',
+                    $scheme,
+                    $components['host'],
+                    $components['port']
+                );
+            } else {
+                $cluster[ $key ] = sprintf(
+                    '%s:%d',
+                    $components['host'],
+                    $components['port']
+                );
+            }
         }
 
         return $cluster;