Add CcrRestoreSourceService to track sessions

server/src/main/java/org/elasticsearch/common/util/iterable/Iterables.java

@@ -34,7 +34,7 @@ public Iterables() {
 
     public static <T> Iterable<T> concat(Iterable<T>... inputs) {
         Objects.requireNonNull(inputs);
-        return new ConcatenatedIterable(inputs);
+        return new ConcatenatedIterable<>(inputs);
     }
 
     static class ConcatenatedIterable<T> implements Iterable<T> {

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/Ccr.java

@@ -24,6 +24,7 @@
 import org.elasticsearch.common.xcontent.NamedXContentRegistry;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.env.NodeEnvironment;
+import org.elasticsearch.index.IndexModule;
 import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.engine.EngineFactory;
 import org.elasticsearch.license.XPackLicenseState;
@@ -58,10 +59,13 @@
 import org.elasticsearch.xpack.ccr.action.TransportUnfollowAction;
 import org.elasticsearch.xpack.ccr.action.bulk.BulkShardOperationsAction;
 import org.elasticsearch.xpack.ccr.action.bulk.TransportBulkShardOperationsAction;
+import org.elasticsearch.xpack.ccr.action.repositories.ClearCcrRestoreSessionAction;
 import org.elasticsearch.xpack.ccr.action.repositories.DeleteInternalCcrRepositoryAction;
+import org.elasticsearch.xpack.ccr.action.repositories.PutCcrRestoreSessionAction;
 import org.elasticsearch.xpack.ccr.action.repositories.PutInternalCcrRepositoryAction;
 import org.elasticsearch.xpack.ccr.index.engine.FollowingEngineFactory;
 import org.elasticsearch.xpack.ccr.repository.CcrRepository;
+import org.elasticsearch.xpack.ccr.repository.CcrRestoreSourceService;
 import org.elasticsearch.xpack.ccr.rest.RestCcrStatsAction;
 import org.elasticsearch.xpack.ccr.rest.RestDeleteAutoFollowPatternAction;
 import org.elasticsearch.xpack.ccr.rest.RestFollowStatsAction;
@@ -112,6 +116,7 @@ public class Ccr extends Plugin implements ActionPlugin, PersistentTaskPlugin, E
     private final Settings settings;
     private final CcrLicenseChecker ccrLicenseChecker;
     private final SetOnce<CcrRepositoryManager> repositoryManager = new SetOnce<>();
+    private final SetOnce<CcrRestoreSourceService> restoreSourceService = new SetOnce<>();
     private Client client;
 
     /**
@@ -153,9 +158,11 @@ public Collection<Object> createComponents(
         }
 
         this.repositoryManager.set(new CcrRepositoryManager(settings, clusterService, client));
-
+        CcrRestoreSourceService restoreSourceService = new CcrRestoreSourceService(settings);
+        this.restoreSourceService.set(restoreSourceService);
         return Arrays.asList(
             ccrLicenseChecker,
+            restoreSourceService,
             new AutoFollowCoordinator(client, clusterService, ccrLicenseChecker)
         );
     }
@@ -182,6 +189,10 @@ public List<PersistentTasksExecutor<?>> getPersistentTasksExecutor(ClusterServic
                     PutInternalCcrRepositoryAction.TransportPutInternalRepositoryAction.class),
                 new ActionHandler<>(DeleteInternalCcrRepositoryAction.INSTANCE,
                     DeleteInternalCcrRepositoryAction.TransportDeleteInternalRepositoryAction.class),
+                new ActionHandler<>(PutCcrRestoreSessionAction.INSTANCE,
+                    PutCcrRestoreSessionAction.TransportPutCcrRestoreSessionAction.class),
+                new ActionHandler<>(ClearCcrRestoreSessionAction.INSTANCE,
+                    ClearCcrRestoreSessionAction.TransportDeleteCcrRestoreSessionAction.class),
                 // stats action
                 new ActionHandler<>(FollowStatsAction.INSTANCE, TransportFollowStatsAction.class),
                 new ActionHandler<>(CcrStatsAction.INSTANCE, TransportCcrStatsAction.class),
@@ -281,6 +292,11 @@ public Map<String, Repository.Factory> getInternalRepositories(Environment env,
         return Collections.singletonMap(CcrRepository.TYPE, repositoryFactory);
     }
 
+    @Override
+    public void onIndexModule(IndexModule indexModule) {
+        indexModule.addIndexEventListener(this.restoreSourceService.get());
+    }
+
     protected XPackLicenseState getLicenseState() { return XPackPlugin.getSharedLicenseState(); }
 
 }

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/action/repositories/ClearCcrRestoreSessionAction.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.ccr.action.repositories;
+
+import org.elasticsearch.action.Action;
+import org.elasticsearch.action.FailedNodeException;
+import org.elasticsearch.action.support.ActionFilters;
+import org.elasticsearch.action.support.nodes.BaseNodeResponse;
+import org.elasticsearch.action.support.nodes.BaseNodesResponse;
+import org.elasticsearch.action.support.nodes.TransportNodesAction;
+import org.elasticsearch.cluster.ClusterName;
+import org.elasticsearch.cluster.node.DiscoveryNode;
+import org.elasticsearch.cluster.service.ClusterService;
+import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.threadpool.ThreadPool;
+import org.elasticsearch.transport.TransportService;
+import org.elasticsearch.xpack.ccr.repository.CcrRestoreSourceService;
+
+import java.io.IOException;
+import java.util.List;
+
+public class ClearCcrRestoreSessionAction extends Action<ClearCcrRestoreSessionAction.ClearCcrRestoreSessionResponse> {
+
+    public static final ClearCcrRestoreSessionAction INSTANCE = new ClearCcrRestoreSessionAction();
+    private static final String NAME = "internal:admin/ccr/restore/session/clear";
+
+    private ClearCcrRestoreSessionAction() {
+        super(NAME);
+    }
+
+    @Override
+    public ClearCcrRestoreSessionResponse newResponse() {
+        return new ClearCcrRestoreSessionResponse();
+    }
+
+    public static class TransportDeleteCcrRestoreSessionAction extends TransportNodesAction<ClearCcrRestoreSessionRequest,
+        ClearCcrRestoreSessionResponse, ClearCcrRestoreSessionRequest.Request, Response> {
+
+        private final CcrRestoreSourceService ccrRestoreService;
+
+        @Inject
+        public TransportDeleteCcrRestoreSessionAction(ThreadPool threadPool, ClusterService clusterService, ActionFilters actionFilters,
+                                                      TransportService transportService, CcrRestoreSourceService ccrRestoreService) {
+            super(NAME, threadPool, clusterService, transportService, actionFilters, ClearCcrRestoreSessionRequest::new,
+                ClearCcrRestoreSessionRequest.Request::new, ThreadPool.Names.GENERIC, Response.class);
+            this.ccrRestoreService = ccrRestoreService;
+        }
+
+        @Override
+        protected ClearCcrRestoreSessionResponse newResponse(ClearCcrRestoreSessionRequest request, List<Response> responses,
+                                                             List<FailedNodeException> failures) {
+            return new ClearCcrRestoreSessionResponse(clusterService.getClusterName(), responses, failures);
+        }
+
+        @Override
+        protected ClearCcrRestoreSessionRequest.Request newNodeRequest(String nodeId, ClearCcrRestoreSessionRequest request) {
+            return request.getRequest();
+        }
+
+        @Override
+        protected Response newNodeResponse() {
+            return new Response();
+        }
+
+        @Override
+        protected Response nodeOperation(ClearCcrRestoreSessionRequest.Request request) {
+            ccrRestoreService.closeSession(request.getSessionUUID());
+            return new Response(clusterService.localNode());
+        }
+    }
+
+    public static class Response extends BaseNodeResponse {
+
+        private Response() {
+        }
+
+        private Response(StreamInput streamInput) throws IOException {
+            readFrom(streamInput);
+        }
+
+        private Response(DiscoveryNode node) {
+            super(node);
+        }
+
+        @Override
+        public void writeTo(StreamOutput out) throws IOException {
+            super.writeTo(out);
+        }
+
+        @Override
+        public void readFrom(StreamInput in) throws IOException {
+            super.readFrom(in);
+        }
+    }
+
+    public static class ClearCcrRestoreSessionResponse extends BaseNodesResponse<Response> {
+
+        ClearCcrRestoreSessionResponse() {
+        }
+
+        ClearCcrRestoreSessionResponse(ClusterName clusterName, List<Response> chunkResponses, List<FailedNodeException> failures) {
+            super(clusterName, chunkResponses, failures);
+        }
+
+        @Override
+        protected List<Response> readNodesFrom(StreamInput in) throws IOException {
+            return in.readList(Response::new);
+        }
+
+        @Override
+        protected void writeNodesTo(StreamOutput out, List<Response> nodes) throws IOException {
+            out.writeList(nodes);
+        }
+    }
+}

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/action/repositories/ClearCcrRestoreSessionRequest.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.ccr.action.repositories;
+
+import org.elasticsearch.action.support.nodes.BaseNodeRequest;
+import org.elasticsearch.action.support.nodes.BaseNodesRequest;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+
+import java.io.IOException;
+
+public class ClearCcrRestoreSessionRequest extends BaseNodesRequest<ClearCcrRestoreSessionRequest> {
+
+    private Request request;
+
+    ClearCcrRestoreSessionRequest() {
+    }
+
+    public ClearCcrRestoreSessionRequest(String nodeId, Request request) {
+        super(nodeId);
+        this.request = request;
+    }
+
+    @Override
+    public void readFrom(StreamInput streamInput) throws IOException {
+        super.readFrom(streamInput);
+        request = new Request();
+        request.readFrom(streamInput);
+    }
+
+    @Override
+    public void writeTo(StreamOutput streamOutput) throws IOException {
+        super.writeTo(streamOutput);
+        request.writeTo(streamOutput);
+    }
+
+    public Request getRequest() {
+        return request;
+    }
+
+    public static class Request extends BaseNodeRequest {
+
+        private String sessionUUID;
+
+        Request() {
+        }
+
+        public Request(String nodeId, String sessionUUID) {
+            super(nodeId);
+            this.sessionUUID = sessionUUID;
+        }
+
+        @Override
+        public void readFrom(StreamInput streamInput) throws IOException {
+            super.readFrom(streamInput);
+            sessionUUID = streamInput.readString();
+        }
+
+        @Override
+        public void writeTo(StreamOutput streamOutput) throws IOException {
+            super.writeTo(streamOutput);
+            streamOutput.writeString(sessionUUID);
+        }
+
+        public String getSessionUUID() {
+            return sessionUUID;
+        }
+    }
+}

x-pack/plugin/ccr/src/main/java/org/elasticsearch/xpack/ccr/action/repositories/PutCcrRestoreSessionAction.java

@@ -0,0 +1,126 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+package org.elasticsearch.xpack.ccr.action.repositories;
+
+import org.elasticsearch.action.Action;
+import org.elasticsearch.action.ActionResponse;
+import org.elasticsearch.action.support.ActionFilters;
+import org.elasticsearch.action.support.single.shard.TransportSingleShardAction;
+import org.elasticsearch.cluster.ClusterState;
+import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
+import org.elasticsearch.cluster.routing.ShardsIterator;
+import org.elasticsearch.cluster.service.ClusterService;
+import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.common.io.stream.StreamInput;
+import org.elasticsearch.common.io.stream.StreamOutput;
+import org.elasticsearch.common.io.stream.Writeable;
+import org.elasticsearch.index.shard.IndexShard;
+import org.elasticsearch.index.shard.ShardId;
+import org.elasticsearch.index.shard.ShardNotFoundException;
+import org.elasticsearch.indices.IndicesService;
+import org.elasticsearch.threadpool.ThreadPool;
+import org.elasticsearch.transport.TransportService;
+import org.elasticsearch.xpack.ccr.repository.CcrRestoreSourceService;
+
+import java.io.IOException;
+
+public class PutCcrRestoreSessionAction extends Action<PutCcrRestoreSessionAction.PutCcrRestoreSessionResponse> {
+
+    public static final PutCcrRestoreSessionAction INSTANCE = new PutCcrRestoreSessionAction();
+    private static final String NAME = "internal:admin/ccr/restore/session/put";
+
+    private PutCcrRestoreSessionAction() {
+        super(NAME);
+    }
+
+    @Override
+    public PutCcrRestoreSessionResponse newResponse() {
+        return new PutCcrRestoreSessionResponse();
+    }
+
+    @Override
+    public Writeable.Reader<PutCcrRestoreSessionAction.PutCcrRestoreSessionResponse> getResponseReader() {
+        return PutCcrRestoreSessionAction.PutCcrRestoreSessionResponse::new;
+    }
+
+    public static class TransportPutCcrRestoreSessionAction
+        extends TransportSingleShardAction<PutCcrRestoreSessionRequest, PutCcrRestoreSessionResponse> {
+
+        private final IndicesService indicesService;
+        private final CcrRestoreSourceService ccrRestoreService;
+
+        @Inject
+        public TransportPutCcrRestoreSessionAction(ThreadPool threadPool, ClusterService clusterService, ActionFilters actionFilters,
+                                                   IndexNameExpressionResolver resolver, TransportService transportService,
+                                                   IndicesService indicesService, CcrRestoreSourceService ccrRestoreService) {
+            super(NAME, threadPool, clusterService, transportService, actionFilters, resolver, PutCcrRestoreSessionRequest::new,
+                ThreadPool.Names.GENERIC);
+            this.indicesService = indicesService;
+            this.ccrRestoreService = ccrRestoreService;
+        }
+
+        @Override
+        protected PutCcrRestoreSessionResponse shardOperation(PutCcrRestoreSessionRequest request, ShardId shardId) throws IOException {
+            IndexShard indexShard = indicesService.getShardOrNull(shardId);
+            if (indexShard == null) {
+                throw new ShardNotFoundException(shardId);
+            }
+            ccrRestoreService.openSession(request.getSessionUUID(), indexShard);
+            return new PutCcrRestoreSessionResponse(indexShard.routingEntry().currentNodeId());
+        }
+
+        @Override
+        protected PutCcrRestoreSessionResponse newResponse() {
+            return new PutCcrRestoreSessionResponse();
+        }
+
+        @Override
+        protected boolean resolveIndex(PutCcrRestoreSessionRequest request) {
+            return false;
+        }
+
+        @Override
+        protected ShardsIterator shards(ClusterState state, InternalRequest request) {
+            final ShardId shardId = request.request().getShardId();
+            return state.routingTable().shardRoutingTable(shardId).primaryShardIt();
+        }
+    }
+
+
+    public static class PutCcrRestoreSessionResponse extends ActionResponse {
+
+        private String nodeId;
+
+        PutCcrRestoreSessionResponse() {
+        }
+
+        PutCcrRestoreSessionResponse(String nodeId) {
+            this.nodeId = nodeId;
+        }
+
+        PutCcrRestoreSessionResponse(StreamInput streamInput) throws IOException {
+            super(streamInput);
+            nodeId = streamInput.readString();
+        }
+
+        @Override
+        public void readFrom(StreamInput streamInput) throws IOException {
+            super.readFrom(streamInput);
+            nodeId = streamInput.readString();
+        }
+
+        @Override
+        public void writeTo(StreamOutput streamOutput) throws IOException {
+            super.writeTo(streamOutput);
+            streamOutput.writeString(nodeId);
+        }
+
+        public String getNodeId() {
+            return nodeId;
+        }
+    }
+}