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// 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.server.index.group;

import com.google.common.collect.ImmutableSet;
import com.google.gerrit.entities.AccountGroup;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.index.IndexConfig;
import com.google.gerrit.index.query.FieldBundle;
import com.google.gerrit.server.config.AllUsersName;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.index.StalenessCheckResult;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Optional;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;

/**
 * Checks if documents in the group index are stale.
 *
 * 

An index document is considered stale if the stored SHA1 differs from the HEAD SHA1 of the * groups branch. */ @Singleton public class StalenessChecker { public static final ImmutableSet FIELDS = ImmutableSet.of(GroupField.UUID_FIELD_SPEC.getName(), GroupField.REF_STATE_SPEC.getName()); private final GroupIndexCollection indexes; private final GitRepositoryManager repoManager; private final IndexConfig indexConfig; private final AllUsersName allUsers; @Inject StalenessChecker( GroupIndexCollection indexes, GitRepositoryManager repoManager, IndexConfig indexConfig, AllUsersName allUsers) { this.indexes = indexes; this.repoManager = repoManager; this.indexConfig = indexConfig; this.allUsers = allUsers; } public StalenessCheckResult check(AccountGroup.UUID uuid) throws IOException { GroupIndex i = indexes.getSearchIndex(); if (i == null) { // No index; caller couldn't do anything if it is stale. return StalenessCheckResult.notStale(); } Optional result = i.getRaw(uuid, IndexedGroupQuery.createOptions(indexConfig, 0, 1, 1, FIELDS)); if (!result.isPresent()) { // The document is missing in the index. try (Repository repo = repoManager.openRepository(allUsers)) { Ref ref = repo.exactRef(RefNames.refsGroups(uuid)); // Stale if the group actually exists. if (ref == null) { return StalenessCheckResult.notStale(); } return StalenessCheckResult.stale( "Document missing in index, but found %s in the repo", ref); } } try (Repository repo = repoManager.openRepository(allUsers)) { Ref ref = repo.exactRef(RefNames.refsGroups(uuid)); ObjectId head = ref == null ? ObjectId.zeroId() : ref.getObjectId(); ObjectId idFromIndex = ObjectId.fromString(result.get().getValue(GroupField.REF_STATE_SPEC), 0); if (head.equals(idFromIndex)) { return StalenessCheckResult.notStale(); } return StalenessCheckResult.stale( "Document has unexpected ref state (%s != %s)", head, idFromIndex); } } }





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