Line data    Source code

       1             : // Copyright (C) 2018 The Android Open Source Project
       2             : //
       3             : // Licensed under the Apache License, Version 2.0 (the "License");
       4             : // you may not use this file except in compliance with the License.
       5             : // You may obtain a copy of the License at
       6             : //
       7             : // http://www.apache.org/licenses/LICENSE-2.0
       8             : //
       9             : // Unless required by applicable law or agreed to in writing, software
      10             : // distributed under the License is distributed on an "AS IS" BASIS,
      11             : // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      12             : // See the License for the specific language governing permissions and
      13             : // limitations under the License.
      14             : 
      15             : package com.google.gerrit.server.schema;
      16             : 
      17             : import static com.google.gerrit.entities.RefNames.REFS_VERSION;
      18             : 
      19             : import com.google.common.annotations.VisibleForTesting;
      20             : import com.google.gerrit.exceptions.StorageException;
      21             : import com.google.gerrit.server.config.AllProjectsName;
      22             : import com.google.gerrit.server.extensions.events.GitReferenceUpdated;
      23             : import com.google.gerrit.server.git.GitRepositoryManager;
      24             : import com.google.gerrit.server.notedb.IntBlob;
      25             : import com.google.inject.Inject;
      26             : import java.io.IOException;
      27             : import java.util.Optional;
      28             : import org.eclipse.jgit.lib.ObjectId;
      29             : import org.eclipse.jgit.lib.Repository;
      30             : import org.eclipse.jgit.revwalk.RevWalk;
      31             : 
      32             : public class NoteDbSchemaVersionManager {
      33             :   private final AllProjectsName allProjectsName;
      34             :   private final GitRepositoryManager repoManager;
      35             : 
      36             :   @Inject
      37             :   @VisibleForTesting
      38             :   public NoteDbSchemaVersionManager(
      39         151 :       AllProjectsName allProjectsName, GitRepositoryManager repoManager) {
      40             :     // Can't inject GitReferenceUpdated here because it has dependencies that are not always
      41             :     // available in this injector (e.g. during init). This is ok for now since no other ref updates
      42             :     // during init are available to plugins, and there are not any other use cases for listening for
      43             :     // updates to the version ref.
      44         151 :     this.allProjectsName = allProjectsName;
      45         151 :     this.repoManager = repoManager;
      46         151 :   }
      47             : 
      48             :   public int read() {
      49         139 :     try (Repository repo = repoManager.openRepository(allProjectsName)) {
      50         139 :       return IntBlob.parse(repo, REFS_VERSION).map(IntBlob::value).orElse(0);
      51           0 :     } catch (IOException e) {
      52           0 :       throw new StorageException("Failed to read " + REFS_VERSION, e);
      53             :     }
      54             :   }
      55             : 
      56             :   public void init() throws IOException {
      57         151 :     try (Repository repo = repoManager.openRepository(allProjectsName);
      58         151 :         RevWalk rw = new RevWalk(repo)) {
      59         151 :       Optional<IntBlob> old = IntBlob.parse(repo, REFS_VERSION, rw);
      60         151 :       if (old.isPresent()) {
      61           0 :         throw new StorageException(
      62           0 :             String.format(
      63           0 :                 "Expected no old version for %s, found %s", REFS_VERSION, old.get().value()));
      64             :       }
      65         151 :       IntBlob.store(
      66             :           repo,
      67             :           rw,
      68             :           allProjectsName,
      69             :           REFS_VERSION,
      70         151 :           old.map(IntBlob::id).orElse(ObjectId.zeroId()),
      71             :           NoteDbSchemaVersions.LATEST,
      72             :           GitReferenceUpdated.DISABLED);
      73             :     }
      74         151 :   }
      75             : 
      76             :   public void increment(int expectedOldVersion) throws IOException {
      77           1 :     try (Repository repo = repoManager.openRepository(allProjectsName);
      78           1 :         RevWalk rw = new RevWalk(repo)) {
      79           1 :       Optional<IntBlob> old = IntBlob.parse(repo, REFS_VERSION, rw);
      80           1 :       if (old.isPresent() && old.get().value() != expectedOldVersion) {
      81           1 :         throw new StorageException(
      82           1 :             String.format(
      83             :                 "Expected old version %d for %s, found %d",
      84           1 :                 expectedOldVersion, REFS_VERSION, old.get().value()));
      85             :       }
      86           1 :       IntBlob.store(
      87             :           repo,
      88             :           rw,
      89             :           allProjectsName,
      90             :           REFS_VERSION,
      91           1 :           old.map(IntBlob::id).orElse(ObjectId.zeroId()),
      92             :           expectedOldVersion + 1,
      93             :           GitReferenceUpdated.DISABLED);
      94             :     }
      95           1 :   }
      96             : }