fix: service copy without default template (#1558)

### Motivation
When copying a service without providing a template we try to fallback
to the "<TaskName>/default" template. But our fallback logic is not
working correctly and causing an NPE.

### Modification
We now only accept a single service when copying. If no default template
exists and no template is provided we respond with an message indicating
the missing template.

### Result
The `service <Service> copy` Command is working again.

##### Other context
Fixes #1550

node/src/main/java/eu/cloudnetservice/node/command/sub/ServiceCommand.java

@@ -22,14 +22,12 @@
 import eu.cloudnetservice.common.column.RowedFormatter;
 import eu.cloudnetservice.common.language.I18n;
 import eu.cloudnetservice.common.resource.ResourceFormatter;
-import eu.cloudnetservice.common.tuple.Tuple2;
 import eu.cloudnetservice.common.util.WildcardUtil;
 import eu.cloudnetservice.driver.channel.ChannelMessageSender;
 import eu.cloudnetservice.driver.event.EventListener;
 import eu.cloudnetservice.driver.event.EventManager;
 import eu.cloudnetservice.driver.event.events.service.CloudServiceLogEntryEvent;
 import eu.cloudnetservice.driver.provider.CloudServiceProvider;
-import eu.cloudnetservice.driver.provider.SpecificCloudServiceProvider;
 import eu.cloudnetservice.driver.service.ServiceDeployment;
 import eu.cloudnetservice.driver.service.ServiceInfoSnapshot;
 import eu.cloudnetservice.driver.service.ServiceRemoteInclusion;
@@ -51,7 +49,6 @@
 import java.util.Objects;
 import java.util.Set;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import lombok.NonNull;
 import org.incendo.cloud.annotation.specifier.Greedy;
@@ -203,44 +200,32 @@ public void copyService(
     @Nullable @Flag("includes") @Quoted String includes,
     @Flag("case-sensitive") boolean caseSensitive
   ) {
-    // associate all services with a template
-    Collection<Tuple2<SpecificCloudServiceProvider, ServiceTemplate>> targets = services.stream()
-      .map(service -> {
-        if (template != null) {
-          return new Tuple2<>(service.provider(), template);
-        } else {
-          // find a matching template
-          return service.configuration().templates().stream()
-            .filter(st -> st.prefix().equalsIgnoreCase(service.serviceId().taskName()))
-            .filter(st -> st.name().equalsIgnoreCase("default"))
-            .map(st -> new Tuple2<>(service.provider(), st))
-            .findFirst()
-            .orElse(null);
-        }
-      })
-      .collect(Collectors.toSet());
-    // check if we found a result
-    if (targets.isEmpty()) {
-      source.sendMessage(I18n.trans("command-service-copy-no-default-template"));
-      return;
+    var service = services.iterator().next();
+    var serviceProvider = service.provider();
+    if (template == null) {
+      template = serviceProvider.installedTemplates().stream()
+        .filter(st -> st.prefix().equalsIgnoreCase(service.serviceId().taskName()))
+        .filter(st -> st.name().equalsIgnoreCase("default"))
+        .findFirst()
+        .orElse(null);
+
+      if (template == null) {
+        source.sendMessage(I18n.trans("command-service-copy-no-default-template", service.serviceId().name()));
+        return;
+      }
     }
+
     // split on a semicolon and try to fix the patterns the user entered
     var parsedExcludes = parseDeploymentPatterns(excludes, caseSensitive);
     var parsedIncludes = parseDeploymentPatterns(includes, caseSensitive);
-    for (var target : targets) {
-      target.first().addServiceDeployment(ServiceDeployment.builder()
-        .template(target.second())
-        .excludes(parsedExcludes)
-        .includes(parsedIncludes)
-        .withDefaultExclusions()
-        .build());
-      target.first().removeAndExecuteDeployments();
-      // send a message for each service we did copy the template of
-      //noinspection ConstantConditions
-      source.sendMessage(I18n.trans("command-service-copy-success",
-        target.first().serviceInfo().name(),
-        target.second().toString()));
-    }
+    serviceProvider.addServiceDeployment(ServiceDeployment.builder()
+      .template(template)
+      .excludes(parsedExcludes)
+      .includes(parsedIncludes)
+      .withDefaultExclusions()
+      .build());
+    serviceProvider.removeAndExecuteDeployments();
+    source.sendMessage(I18n.trans("command-service-copy-success", service.serviceId().name(), template));
   }
 
   @Command("service|ser <name> delete|del")

node/src/main/resources/lang/de_DE.properties

@@ -175,7 +175,7 @@ command-cluster-start-sync=Die Cluster Synchronisation wird gestartet
 # Command Service
 #
 command-service-description=Verwaltet alle Services in dem Cluster
-command-service-copy-no-default-template=Der von Dir angegebene Service hat keine default Template. Benutze "copy {0$name$} template\=storage\:prefix/name" um ein Template anzugeben, in das du kopieren möchtest
+command-service-copy-no-default-template=Der angegebene Service hat kein default Template. Um ein Template anzugeben kann "service {0$name$} copy --template storage\:prefix/name" verwendet werden
 command-service-copy-success=Der Service {0$name$} wurde erfolgreich in das Template {1$template$} kopiert
 command-service-add-deployment-success=Das Deployment {0$deployment$} wurde erfolgreich zu der Warteschlange hinzugefügt
 command-service-deploy-deployment-success=Die Ressourcen des Services wurden erfolgreich deployed

node/src/main/resources/lang/en_US.properties

@@ -175,7 +175,7 @@ command-cluster-start-sync=The cluster sync starts now
 # Command Service
 #
 command-service-description=Manages all services in the cluster
-command-service-copy-no-default-template=The service you provided does not have a default template, use "copy {0$name$} template=storage:prefix/name" to provide a template you would like to copy to
+command-service-copy-no-default-template=The provided service does not have a default template. To specify a template "service {0$name$} copy --template storage:prefix/name" can be used
 command-service-copy-success=The service {0$name$} was successfully copied to the template {1$template$}
 command-service-add-deployment-success=The deployment {0$deployment$} was successfully added to the waiting deployments
 command-service-deploy-deployment-success=The resources of the service were successfully deployed