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// Copyright (C) 2014 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.restapi.project;
import static com.google.common.collect.ImmutableList.toImmutableList;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.gerrit.entities.Project;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.restapi.ChildCollection;
import com.google.gerrit.extensions.restapi.IdString;
import com.google.gerrit.extensions.restapi.ResourceNotFoundException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.RestView;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.index.change.ChangeIndexCollection;
import com.google.gerrit.server.project.CommitResource;
import com.google.gerrit.server.project.ProjectResource;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.project.Reachable;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.ChangePredicates;
import com.google.gerrit.server.update.RetryHelper;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.RefDatabase;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
/** The collection of commit IDs (ie. 40 char hex IDs) */
@Singleton
public class CommitsCollection implements ChildCollection {
private final DynamicMap> views;
private final GitRepositoryManager repoManager;
private final RetryHelper retryHelper;
private final ChangeIndexCollection indexes;
private final Reachable reachable;
@Inject
public CommitsCollection(
DynamicMap> views,
GitRepositoryManager repoManager,
RetryHelper retryHelper,
ChangeIndexCollection indexes,
Reachable reachable) {
this.views = views;
this.repoManager = repoManager;
this.retryHelper = retryHelper;
this.indexes = indexes;
this.reachable = reachable;
}
@Override
public RestView list() throws ResourceNotFoundException {
throw new ResourceNotFoundException();
}
@Override
public CommitResource parse(ProjectResource parent, IdString id)
throws RestApiException, IOException {
parent.getProjectState().checkStatePermitsRead();
ObjectId objectId;
try {
objectId = ObjectId.fromString(id.get());
} catch (IllegalArgumentException e) {
throw new ResourceNotFoundException(id, e);
}
try (Repository repo = repoManager.openRepository(parent.getNameKey());
RevWalk rw = new RevWalk(repo)) {
RevCommit commit = rw.parseCommit(objectId);
if (!canRead(parent.getProjectState(), repo, commit)) {
throw new ResourceNotFoundException(id);
}
// GetCommit depends on the body of both the commit and parent being parsed, to get the
// subject.
rw.parseBody(commit);
for (int i = 0; i < commit.getParentCount(); i++) {
rw.parseBody(rw.parseCommit(commit.getParent(i)));
}
return new CommitResource(parent, commit);
} catch (MissingObjectException | IncorrectObjectTypeException e) {
throw new ResourceNotFoundException(id, e);
}
}
@Override
public DynamicMap> views() {
return views;
}
/**
* Returns true if {@code commit} is visible to the caller and {@code commit} is reachable from
* the given branch.
*/
public boolean canRead(ProjectState state, Repository repo, RevCommit commit, Ref ref) {
return reachable.fromRefs(state.getNameKey(), repo, commit, ImmutableList.of(ref));
}
/** Returns true if {@code commit} is visible to the caller. */
public boolean canRead(ProjectState state, Repository repo, RevCommit commit) throws IOException {
Project.NameKey project = state.getNameKey();
if (indexes.getSearchIndex() == null) {
// No index in slaves, fall back to scanning refs. We must inspect change refs too
// as the commit might be a patchset of a not yet submitted change.
return reachable.fromRefs(project, repo, commit, repo.getRefDatabase().getRefs());
}
// Check first if any patchset of any change references the commit in question. This is much
// cheaper than ref visibility filtering and reachability computation.
List changes =
retryHelper
.changeIndexQuery(
"queryChangesByProjectCommitWithLimit1",
q -> q.enforceVisibility(true).setLimit(1).byProjectCommit(project, commit))
.call();
if (!changes.isEmpty()) {
return true;
}
if (commit.getParents() != null && commit.getParents().length > 0) {
// Maybe the commit was a merge commit of a change. Try to find promising candidates for
// branches to check, by seeing if its parents were associated to changes.
// Only request changes from the index if the commit has parents. If size(parents) == 0, then
// the query does not make sense (it would request all changes from the project).
ImmutableList> parentPredicates =
Arrays.stream(commit.getParents())
.map(parent -> ChangePredicates.commitPrefix(parent.getId().getName()))
.collect(toImmutableList());
Predicate pred =
Predicate.and(ChangePredicates.project(project), Predicate.or(parentPredicates));
changes =
retryHelper
.changeIndexQuery(
"queryChangesByProjectCommit", q -> q.enforceVisibility(true).query(pred))
.call();
Set branchesForCommitParents = new HashSet<>(changes.size());
for (ChangeData cd : changes) {
Ref ref = repo.exactRef(cd.change().getDest().branch());
if (ref != null) {
branchesForCommitParents.add(ref);
}
}
if (reachable.fromRefs(
project, repo, commit, branchesForCommitParents.stream().collect(Collectors.toList()))) {
return true;
}
}
// This check covers 2 situations:
// 1) The commit does not have any parents. Check if it is visible from any ref in the project.
// Exclude change refs, since it is confirmed the commit is not a patchset of any change.
// 2) If we have already checked change refs using the change index, spare any further checks
// for changes.
List refs =
repo.getRefDatabase()
.getRefsByPrefixWithExclusions(RefDatabase.ALL, ImmutableSet.of(RefNames.REFS_CHANGES));
return reachable.fromRefs(project, repo, commit, refs);
}
}
