Implement group index for ElasticSearch

Change-Id: Id000705cf4215fe1c9be03573d97726a8fe9570b
Signed-off-by: Edwin Kempin <ekempin@google.com>

gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticGroupIndex.java

@@ -0,0 +1,227 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// 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 com.google.gerrit.elasticsearch;
+
+import static com.google.gson.FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
+import com.google.gerrit.elasticsearch.ElasticMapping.MappingProperties;
+import com.google.gerrit.reviewdb.client.AccountGroup;
+import com.google.gerrit.server.account.GroupCache;
+import com.google.gerrit.server.config.GerritServerConfig;
+import com.google.gerrit.server.config.SitePaths;
+import com.google.gerrit.server.index.FieldDef.FillArgs;
+import com.google.gerrit.server.index.IndexUtils;
+import com.google.gerrit.server.index.QueryOptions;
+import com.google.gerrit.server.index.Schema;
+import com.google.gerrit.server.index.group.GroupField;
+import com.google.gerrit.server.index.group.GroupIndex;
+import com.google.gerrit.server.query.DataSource;
+import com.google.gerrit.server.query.Predicate;
+import com.google.gerrit.server.query.QueryParseException;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gwtorm.server.OrmException;
+import com.google.gwtorm.server.ResultSet;
+import com.google.inject.assistedinject.Assisted;
+import com.google.inject.assistedinject.AssistedInject;
+
+import org.eclipse.jgit.lib.Config;
+import org.elasticsearch.index.query.QueryBuilder;
+import org.elasticsearch.search.builder.SearchSourceBuilder;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import io.searchbox.client.JestResult;
+import io.searchbox.core.Bulk;
+import io.searchbox.core.Bulk.Builder;
+import io.searchbox.core.Search;
+import io.searchbox.core.search.sort.Sort;
+import io.searchbox.core.search.sort.Sort.Sorting;
+
+public class ElasticGroupIndex
+    extends AbstractElasticIndex<AccountGroup.UUID, AccountGroup>
+    implements GroupIndex {
+  static class GroupMapping {
+    MappingProperties groups;
+
+    GroupMapping(Schema<AccountGroup> schema) {
+      this.groups = ElasticMapping.createMapping(schema);
+    }
+  }
+
+  static final String GROUPS = "groups";
+  static final String GROUPS_PREFIX = GROUPS + "_";
+
+  private static final Logger log =
+      LoggerFactory.getLogger(ElasticGroupIndex.class);
+
+  private final Gson gson;
+  private final GroupMapping mapping;
+  private final GroupCache groupCache;
+  private final ElasticQueryBuilder queryBuilder;
+
+  @AssistedInject
+  ElasticGroupIndex(
+      @GerritServerConfig Config cfg,
+      FillArgs fillArgs,
+      SitePaths sitePaths,
+      GroupCache groupCache,
+      @Assisted Schema<AccountGroup> schema) {
+    super(cfg, fillArgs, sitePaths, schema, GROUPS_PREFIX);
+    this.groupCache = groupCache;
+    this.mapping = new GroupMapping(schema);
+    this.queryBuilder = new ElasticQueryBuilder();
+    this.gson = new GsonBuilder()
+        .setFieldNamingPolicy(LOWER_CASE_WITH_UNDERSCORES).create();
+  }
+
+  @Override
+  public void replace(AccountGroup group) throws IOException {
+    Bulk bulk = new Bulk.Builder()
+        .defaultIndex(indexName)
+        .defaultType(GROUPS)
+        .addAction(insert(GROUPS, group))
+        .refresh(refresh)
+        .build();
+    JestResult result = client.execute(bulk);
+    if (!result.isSucceeded()) {
+      throw new IOException(
+          String.format("Failed to replace group %s in index %s: %s",
+              group.getGroupUUID().get(), indexName, result.getErrorMessage()));
+    }
+  }
+
+  @Override
+  public DataSource<AccountGroup> getSource(Predicate<AccountGroup> p,
+      QueryOptions opts) throws QueryParseException {
+    return new QuerySource(p, opts);
+  }
+
+  @Override
+  protected Builder addActions(Builder builder, AccountGroup.UUID c) {
+    return builder.addAction(delete(GROUPS, c));
+  }
+
+  @Override
+  protected String getMappings() {
+    ImmutableMap<String, GroupMapping> mappings =
+        ImmutableMap.of("mappings", mapping);
+    return gson.toJson(mappings);
+  }
+
+  @Override
+  protected String getId(AccountGroup group) {
+    return group.getGroupUUID().get();
+  }
+
+  private class QuerySource implements DataSource<AccountGroup> {
+    private final Search search;
+    private final Set<String> fields;
+
+    QuerySource(Predicate<AccountGroup> p, QueryOptions opts)
+        throws QueryParseException {
+      QueryBuilder qb = queryBuilder.toQueryBuilder(p);
+      fields = IndexUtils.groupFields(opts);
+      SearchSourceBuilder searchSource = new SearchSourceBuilder()
+          .query(qb)
+          .from(opts.start())
+          .size(opts.limit())
+          .fields(Lists.newArrayList(fields));
+
+      Sort sort = new Sort(GroupField.UUID.getName(), Sorting.ASC);
+      sort.setIgnoreUnmapped();
+
+      search = new Search.Builder(searchSource.toString())
+          .addType(GROUPS)
+          .addIndex(indexName)
+          .addSort(ImmutableList.of(sort))
+          .build();
+    }
+
+    @Override
+    public int getCardinality() {
+      return 10;
+    }
+
+    @Override
+    public ResultSet<AccountGroup> read() throws OrmException {
+      try {
+        List<AccountGroup> results = Collections.emptyList();
+        JestResult result = client.execute(search);
+        if (result.isSucceeded()) {
+          JsonObject obj = result.getJsonObject().getAsJsonObject("hits");
+          if (obj.get("hits") != null) {
+            JsonArray json = obj.getAsJsonArray("hits");
+            results = Lists.newArrayListWithCapacity(json.size());
+            for (int i = 0; i < json.size(); i++) {
+              results.add(toAccountGroup(json.get(i)));
+            }
+          }
+        } else {
+          log.error(result.getErrorMessage());
+        }
+        final List<AccountGroup> r = Collections.unmodifiableList(results);
+        return new ResultSet<AccountGroup>() {
+          @Override
+          public Iterator<AccountGroup> iterator() {
+            return r.iterator();
+          }
+
+          @Override
+          public List<AccountGroup> toList() {
+            return r;
+          }
+
+          @Override
+          public void close() {
+            // Do nothing.
+          }
+        };
+      } catch (IOException e) {
+        throw new OrmException(e);
+      }
+    }
+
+    @Override
+    public String toString() {
+      return search.toString();
+    }
+
+    private AccountGroup toAccountGroup(JsonElement json) {
+      JsonElement source = json.getAsJsonObject().get("_source");
+      if (source == null) {
+        source = json.getAsJsonObject().get("fields");
+      }
+
+      AccountGroup.UUID uuid = new AccountGroup.UUID(
+          source.getAsJsonObject().get(GroupField.UUID.getName()).getAsString());
+      // Use the GroupCache rather than depending on any stored fields in the
+      // document (of which there shouldn't be any).
+      return groupCache.get(uuid);
+    }
+  }
+}

gerrit-elasticsearch/src/main/java/com/google/gerrit/elasticsearch/ElasticIndexModule.java

@@ -21,6 +21,7 @@ import com.google.gerrit.server.index.IndexModule;
 import com.google.gerrit.server.index.SingleVersionModule;
 import com.google.gerrit.server.index.account.AccountIndex;
 import com.google.gerrit.server.index.change.ChangeIndex;
+import com.google.gerrit.server.index.group.GroupIndex;
 import com.google.inject.Provides;
 import com.google.inject.Singleton;
 import com.google.inject.assistedinject.FactoryModuleBuilder;
@@ -49,14 +50,18 @@ public class ElasticIndexModule extends LifecycleModule {
 
   @Override
   protected void configure() {
+    install(
+        new FactoryModuleBuilder()
+        .implement(AccountIndex.class, ElasticAccountIndex.class)
+        .build(AccountIndex.Factory.class));
     install(
         new FactoryModuleBuilder()
             .implement(ChangeIndex.class, ElasticChangeIndex.class)
             .build(ChangeIndex.Factory.class));
     install(
         new FactoryModuleBuilder()
-            .implement(AccountIndex.class, ElasticAccountIndex.class)
+        .implement(GroupIndex.class, ElasticGroupIndex.class)
-            .build(AccountIndex.Factory.class));
+        .build(GroupIndex.Factory.class));
 
     install(new IndexModule(threads));
     install(new SingleVersionModule(singleVersions));

gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticQueryGroupsTest.java

@@ -0,0 +1,69 @@
+// Copyright (C) 2017 The Android Open Source Project
+//
+// 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 com.google.gerrit.elasticsearch;
+
+import com.google.gerrit.elasticsearch.ElasticTestUtils.ElasticNodeInfo;
+import com.google.gerrit.server.query.group.AbstractQueryGroupsTest;
+import com.google.gerrit.testutil.InMemoryModule;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+
+import org.eclipse.jgit.lib.Config;
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+
+import java.util.concurrent.ExecutionException;
+
+public class ElasticQueryGroupsTest extends AbstractQueryGroupsTest {
+  private static ElasticNodeInfo nodeInfo;
+
+  @BeforeClass
+  public static void startIndexService()
+      throws InterruptedException, ExecutionException {
+    if (nodeInfo != null) {
+      // do not start Elasticsearch twice
+      return;
+    }
+    nodeInfo = ElasticTestUtils.startElasticsearchNode();
+    ElasticTestUtils.createAllIndexes(nodeInfo);
+  }
+
+  @AfterClass
+  public static void stopElasticsearchServer() {
+    if (nodeInfo != null) {
+      nodeInfo.node.close();
+      nodeInfo.elasticDir.delete();
+      nodeInfo = null;
+    }
+  }
+
+  @After
+  public void cleanupIndex() {
+    if (nodeInfo != null) {
+      ElasticTestUtils.deleteAllIndexes(nodeInfo);
+      ElasticTestUtils.createAllIndexes(nodeInfo);
+    }
+  }
+
+  @Override
+  protected Injector createInjector() {
+    Config elasticsearchConfig = new Config(config);
+    InMemoryModule.setDefaults(elasticsearchConfig);
+    ElasticTestUtils.configure(elasticsearchConfig, nodeInfo.port);
+    return Guice.createInjector(
+        new InMemoryModule(elasticsearchConfig, notesMigration));
+  }
+}

gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticTestUtils.java

@@ -19,16 +19,20 @@ import static com.google.gerrit.elasticsearch.ElasticAccountIndex.ACCOUNTS_PREFI
 import static com.google.gerrit.elasticsearch.ElasticChangeIndex.CHANGES_PREFIX;
 import static com.google.gerrit.elasticsearch.ElasticChangeIndex.CLOSED_CHANGES;
 import static com.google.gerrit.elasticsearch.ElasticChangeIndex.OPEN_CHANGES;
+import static com.google.gerrit.elasticsearch.ElasticGroupIndex.GROUPS_PREFIX;
 
 import com.google.common.base.Strings;
 import com.google.common.io.Files;
 import com.google.gerrit.elasticsearch.ElasticAccountIndex.AccountMapping;
 import com.google.gerrit.elasticsearch.ElasticChangeIndex.ChangeMapping;
+import com.google.gerrit.elasticsearch.ElasticGroupIndex.GroupMapping;
+import com.google.gerrit.reviewdb.client.AccountGroup;
 import com.google.gerrit.server.account.AccountState;
 import com.google.gerrit.server.index.IndexModule.IndexType;
 import com.google.gerrit.server.index.Schema;
 import com.google.gerrit.server.index.account.AccountSchemaDefinitions;
 import com.google.gerrit.server.index.change.ChangeSchemaDefinitions;
+import com.google.gerrit.server.index.group.GroupSchemaDefinitions;
 import com.google.gerrit.server.query.change.ChangeData;
 import com.google.gson.FieldNamingPolicy;
 import com.google.gson.Gson;
@@ -154,6 +158,20 @@ final class ElasticTestUtils {
         .addMapping(ElasticAccountIndex.ACCOUNTS, gson.toJson(accountMapping))
         .execute()
         .actionGet();
+
+    Schema<AccountGroup> groupSchema =
+        GroupSchemaDefinitions.INSTANCE.getLatest();
+    GroupMapping groupMapping = new GroupMapping(groupSchema);
+    nodeInfo.node
+        .client()
+        .admin()
+        .indices()
+        .prepareCreate(
+            String.format(
+                "%s%04d", GROUPS_PREFIX, groupSchema.getVersion()))
+        .addMapping(ElasticGroupIndex.GROUPS, gson.toJson(groupMapping))
+        .execute()
+        .actionGet();
   }
 
   private static String getHttpPort(Node node)