JCLOUDS-618: Allow servers without boot device in ElasticStack

apis/elasticstack/src/main/java/org/jclouds/elasticstack/compute/functions/ServerInfoToNodeMetadata.java

@@ -158,6 +158,7 @@ public class ServerInfoToNodeMetadata implements Function<ServerInfo, NodeMetada
       @Override
       public String apply(Server from) {
          String imageId = null;
+         if (!from.getBootDeviceIds().isEmpty()) {
             String bootDeviceId = Iterables.get(from.getBootDeviceIds(), 0);
             Device bootDevice = from.getDevices().get(bootDeviceId);
             if (bootDevice != null) {
@@ -170,6 +171,7 @@ public class ServerInfoToNodeMetadata implements Function<ServerInfo, NodeMetada
                   logger.warn(e, "error finding drive %s: %s", bootDevice.getDriveUuid(), e.getMessage());
                }
             }
+         }
          return imageId;
       }
    }

apis/elasticstack/src/test/java/org/jclouds/elasticstack/compute/functions/GetImageIdFromServerTest.java

@@ -0,0 +1,104 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.jclouds.elasticstack.compute.functions;
+
+import static org.testng.Assert.assertEquals;
+import static org.testng.Assert.assertNull;
+
+import java.util.Map;
+import java.util.UUID;
+
+import org.jclouds.elasticstack.compute.functions.ServerInfoToNodeMetadata.GetImageIdFromServer;
+import org.jclouds.elasticstack.domain.Device;
+import org.jclouds.elasticstack.domain.DriveInfo;
+import org.jclouds.elasticstack.domain.DriveMetrics;
+import org.jclouds.elasticstack.domain.SCSIDevice;
+import org.jclouds.elasticstack.domain.Server;
+import org.jclouds.elasticstack.domain.VNC;
+import org.testng.annotations.Test;
+
+import com.google.common.base.Function;
+import com.google.common.cache.CacheBuilder;
+import com.google.common.cache.CacheLoader;
+import com.google.common.cache.LoadingCache;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import com.google.common.collect.Maps;
+
+/**
+ * Unit tests for the {@link GetImageIdFromServer} class.
+ */
+@Test(groups = "unit", testName = "GetImageIdFromServerTest")
+public class GetImageIdFromServerTest {
+
+   private static final String UNKNOWN_DRIVE_UUID = UUID.randomUUID().toString();
+
+   private LoadingCache<String, DriveInfo> knownDrives = CacheBuilder.newBuilder().build(
+         new CacheLoader<String, DriveInfo>() {
+            @Override
+            public DriveInfo load(String key) throws Exception {
+               // Use a mock UUID to be able to simulate the unknown drives
+               return UNKNOWN_DRIVE_UUID.equals(key) ? null : new DriveInfo.Builder().name("foo")
+                     .metrics(new DriveMetrics.Builder().build()).build();
+            }
+         });
+
+   private GetImageIdFromServer function = new GetImageIdFromServer(knownDrives);
+
+   public void testImageIdExists() {
+      Map<String, Device> devices = deviceMapFor(UUID.randomUUID().toString());
+      Server server = serverFor(devices, devices.keySet());
+      assertEquals(function.apply(server), "foo");
+   }
+
+   public void testImageIdExistsAndUsesTheFirstDevice() {
+      Map<String, Device> devices = deviceMapFor(UUID.randomUUID().toString(), UNKNOWN_DRIVE_UUID);
+      Server server = serverFor(devices, devices.keySet());
+      assertEquals(function.apply(server), "foo");
+   }
+
+   public void testImageIdIsNullWhenNoBootableDevices() {
+      Map<String, Device> devices = deviceMapFor(UUID.randomUUID().toString());
+      Server server = serverFor(devices, ImmutableSet.<String> of());
+      assertNull(function.apply(server));
+   }
+
+   public void testImageIdIsNullWhenNoDeviceWithGivenId() {
+      Map<String, Device> devices = deviceMapFor(UUID.randomUUID().toString());
+      Server server = serverFor(ImmutableMap.<String, Device> of(), devices.keySet());
+      assertNull(function.apply(server));
+   }
+
+   private static Map<String, Device> deviceMapFor(String... uuids) {
+      ImmutableSet.Builder<Device> devices = ImmutableSet.builder();
+      for (int i = 0; i < uuids.length; i++) {
+         devices.add(new SCSIDevice.Builder(i).uuid(uuids[i]).build());
+      }
+
+      return Maps.uniqueIndex(devices.build(), new Function<Device, String>() {
+         @Override
+         public String apply(Device input) {
+            return input.getId();
+         }
+      });
+   }
+
+   private static Server serverFor(Map<String, Device> devices, Iterable<String> deviceIds) {
+      return new Server.Builder().name("test").vnc(new VNC(null, null, false)).devices(devices)
+            .bootDeviceIds(deviceIds).build();
+   }
+}