Temporarily restore support for gRPC.port for backwards compatibility

Author: ST-DDT

grpc-client-spring-boot-autoconfigure/src/main/java/net/devh/boot/grpc/client/nameresolver/DiscoveryClientNameResolver.java

@@ -52,6 +52,8 @@
 @Slf4j
 public class DiscoveryClientNameResolver extends NameResolver {
 
+    @Deprecated
+    private static final String LEGACY_CLOUD_DISCOVERY_METADATA_PORT = "gRPC.port";
     private static final List<ServiceInstance> KEEP_PREVIOUS = null;
 
     private final String name;
@@ -243,9 +245,16 @@ private int getGRPCPort(final ServiceInstance instance) {
             if (metadata == null) {
                 return instance.getPort();
             }
-            final String portString = metadata.get(GrpcUtils.CLOUD_DISCOVERY_METADATA_PORT);
+            String portString = metadata.get(GrpcUtils.CLOUD_DISCOVERY_METADATA_PORT);
             if (portString == null) {
-                return instance.getPort();
+                portString = metadata.get(LEGACY_CLOUD_DISCOVERY_METADATA_PORT);
+                if (portString == null) {
+                    return instance.getPort();
+                } else {
+                    log.warn("Found legacy grpc port metadata '{}' for client '{}' use '{}' instead",
+                            LEGACY_CLOUD_DISCOVERY_METADATA_PORT, DiscoveryClientNameResolver.this.name,
+                            GrpcUtils.CLOUD_DISCOVERY_METADATA_PORT);
+                }
             }
             try {
                 return Integer.parseInt(portString);