Detangling incubator: virtual nets, tunnels, resource labels, oh my

- virtual networking moved to /apps/virtual; with CLI & REST API
- tunnels and labels moved to /apps/tunnel; with CLI & REST API; UI disabled for now
- protobuf/models moved to /core/protobuf/models
- defunct grpc/rpc registry stuff left under /graveyard
- compile dependencies on /incubator moved to respective modules for compilation
- run-time dependencies will need to be re-tested for dependent apps

- /graveyard will be removed in not-too-distant future

Change-Id: I0a0b995c635487edcf95a352f50dd162186b0b39
diff --git a/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/rest/TenantWebResource.java b/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/rest/TenantWebResource.java
new file mode 100644
index 0000000..768c3b9
--- /dev/null
+++ b/apps/virtual/app/src/main/java/org/onosproject/incubator/net/virtual/rest/TenantWebResource.java
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2018-present Open Networking Foundation
+ *
+ * Licensed 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.onosproject.incubator.net.virtual.rest;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+import org.onlab.util.ItemNotFoundException;
+import org.onosproject.net.TenantId;
+import org.onosproject.incubator.net.virtual.VirtualNetworkAdminService;
+import org.onosproject.rest.AbstractWebResource;
+
+import javax.ws.rs.Consumes;
+import javax.ws.rs.DELETE;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.PathParam;
+import javax.ws.rs.Produces;
+import javax.ws.rs.core.Context;
+import javax.ws.rs.core.MediaType;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.UriBuilder;
+import javax.ws.rs.core.UriInfo;
+import java.io.IOException;
+import java.io.InputStream;
+
+import static org.onlab.util.Tools.readTreeFromStream;
+
+/**
+ * Query and manage tenants of virtual networks.
+ */
+@Path("tenants")
+public class TenantWebResource extends AbstractWebResource {
+
+    private static final String MISSING_TENANTID = "Missing tenant identifier";
+    private static final String TENANTID_NOT_FOUND = "Tenant identifier not found";
+    private static final String INVALID_TENANTID = "Invalid tenant identifier ";
+
+    @Context
+    private UriInfo uriInfo;
+
+    private final VirtualNetworkAdminService vnetAdminService = get(VirtualNetworkAdminService.class);
+
+    /**
+     * Returns all tenant identifiers.
+     *
+     * @return 200 OK with set of tenant identifiers
+     * @onos.rsModel TenantIds
+     */
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response getVirtualNetworkTenantIds() {
+        Iterable<TenantId> tenantIds = vnetAdminService.getTenantIds();
+        return ok(encodeArray(TenantId.class, "tenants", tenantIds)).build();
+    }
+
+    /**
+     * Creates a tenant with the given tenant identifier.
+     *
+     * @param stream TenantId JSON stream
+     * @return status of the request - CREATED if the JSON is correct,
+     * BAD_REQUEST if the JSON is invalid
+     * @onos.rsModel TenantId
+     */
+    @POST
+    @Consumes(MediaType.APPLICATION_JSON)
+    @Produces(MediaType.APPLICATION_JSON)
+    public Response addTenantId(InputStream stream) {
+        try {
+            final TenantId tid = getTenantIdFromJsonStream(stream);
+            vnetAdminService.registerTenantId(tid);
+            final TenantId resultTid = getExistingTenantId(vnetAdminService, tid);
+            UriBuilder locationBuilder = uriInfo.getBaseUriBuilder()
+                    .path("tenants")
+                    .path(resultTid.id());
+            return Response
+                    .created(locationBuilder.build())
+                    .build();
+        } catch (IOException e) {
+            throw new IllegalArgumentException(e);
+        }
+    }
+
+    /**
+     * Removes the specified tenant with the specified tenant identifier.
+     *
+     * @param tenantId tenant identifier
+     * @return 204 NO CONTENT
+     */
+    @DELETE
+    @Path("{tenantId}")
+    public Response removeTenantId(@PathParam("tenantId") String tenantId) {
+        final TenantId tid = TenantId.tenantId(tenantId);
+        final TenantId existingTid = getExistingTenantId(vnetAdminService, tid);
+        vnetAdminService.unregisterTenantId(existingTid);
+        return Response.noContent().build();
+    }
+
+    /**
+     * Gets the tenant identifier from the JSON stream.
+     *
+     * @param stream TenantId JSON stream
+     * @return TenantId
+     * @throws IOException if unable to parse the request
+     */
+    private TenantId getTenantIdFromJsonStream(InputStream stream) throws IOException {
+        ObjectNode jsonTree = readTreeFromStream(mapper(), stream);
+        JsonNode specifiedTenantId = jsonTree.get("id");
+
+        if (specifiedTenantId == null) {
+            throw new IllegalArgumentException(MISSING_TENANTID);
+        }
+        return TenantId.tenantId(specifiedTenantId.asText());
+    }
+
+    /**
+     * Get the matching tenant identifier from existing tenant identifiers in system.
+     *
+     * @param vnetAdminSvc virtual network administration service
+     * @param tidIn        tenant identifier
+     * @return TenantId
+     */
+    protected static TenantId getExistingTenantId(VirtualNetworkAdminService vnetAdminSvc,
+                                                TenantId tidIn) {
+        return vnetAdminSvc
+                .getTenantIds()
+                .stream()
+                .filter(tenantId -> tenantId.equals(tidIn))
+                .findFirst()
+                .orElseThrow(() -> new ItemNotFoundException(TENANTID_NOT_FOUND));
+    }
+}