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// Copyright (C) 2018 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.project;
import static com.google.gerrit.index.query.Predicate.and;
import static com.google.gerrit.index.query.Predicate.or;
import static com.google.gerrit.server.query.change.ChangeStatusPredicate.open;
import static java.util.stream.Collectors.toSet;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Strings;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.entities.Project;
import com.google.gerrit.entities.RefNames;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.extensions.api.changes.FixInput;
import com.google.gerrit.extensions.api.projects.CheckProjectInput;
import com.google.gerrit.extensions.api.projects.CheckProjectInput.AutoCloseableChangesCheckInput;
import com.google.gerrit.extensions.api.projects.CheckProjectResultInfo;
import com.google.gerrit.extensions.api.projects.CheckProjectResultInfo.AutoCloseableChangesCheckResult;
import com.google.gerrit.extensions.client.ListChangesOption;
import com.google.gerrit.extensions.common.ChangeInfo;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.index.IndexConfig;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.server.ChangeUtil;
import com.google.gerrit.server.change.ChangeJson;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.index.change.ChangeField;
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.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevSort;
import org.eclipse.jgit.revwalk.RevWalk;
@Singleton
public class ProjectsConsistencyChecker {
@VisibleForTesting public static final int AUTO_CLOSE_MAX_COMMITS_LIMIT = 10000;
private final GitRepositoryManager repoManager;
private final RetryHelper retryHelper;
private final ChangeJson.Factory changeJsonFactory;
private final IndexConfig indexConfig;
private final ChangeUtil changeUtil;
@Inject
ProjectsConsistencyChecker(
GitRepositoryManager repoManager,
RetryHelper retryHelper,
ChangeJson.Factory changeJsonFactory,
IndexConfig indexConfig,
ChangeUtil changeUtil) {
this.repoManager = repoManager;
this.retryHelper = retryHelper;
this.changeJsonFactory = changeJsonFactory;
this.indexConfig = indexConfig;
this.changeUtil = changeUtil;
}
public CheckProjectResultInfo check(Project.NameKey projectName, CheckProjectInput input)
throws IOException, RestApiException {
CheckProjectResultInfo r = new CheckProjectResultInfo();
if (input.autoCloseableChangesCheck != null) {
r.autoCloseableChangesCheckResult =
checkForAutoCloseableChanges(projectName, input.autoCloseableChangesCheck);
}
return r;
}
private AutoCloseableChangesCheckResult checkForAutoCloseableChanges(
Project.NameKey projectName, AutoCloseableChangesCheckInput input)
throws IOException, RestApiException {
AutoCloseableChangesCheckResult r = new AutoCloseableChangesCheckResult();
if (Strings.isNullOrEmpty(input.branch)) {
throw new BadRequestException("branch is required");
}
boolean fix = input.fix != null ? input.fix : false;
if (input.maxCommits != null && input.maxCommits > AUTO_CLOSE_MAX_COMMITS_LIMIT) {
throw new BadRequestException(
"max commits can at most be set to " + AUTO_CLOSE_MAX_COMMITS_LIMIT);
}
int maxCommits = input.maxCommits != null ? input.maxCommits : AUTO_CLOSE_MAX_COMMITS_LIMIT;
// Result that we want to return to the client.
List autoCloseableChanges = new ArrayList<>();
// Remember the change IDs of all changes that we already included into the result, so that we
// can avoid including the same change twice.
Set seenChanges = new HashSet<>();
try (Repository repo = repoManager.openRepository(projectName);
RevWalk rw = new RevWalk(repo)) {
String branch = RefNames.fullName(input.branch);
Ref ref = repo.exactRef(branch);
if (ref == null) {
throw new UnprocessableEntityException(
String.format("branch '%s' not found", input.branch));
}
rw.reset();
rw.markStart(rw.parseCommit(ref.getObjectId()));
rw.sort(RevSort.TOPO);
rw.sort(RevSort.REVERSE);
// Cache the SHA1's of all merged commits. We need this for knowing which commit merged the
// change when auto-closing changes by commit.
List mergedSha1s = new ArrayList<>();
// Cache the Change-Id to commit SHA1 mapping for all Change-Id's that we find in merged
// commits. We need this for knowing which commit merged the change when auto-closing
// changes by Change-Id.
Map changeIdToMergedSha1 = new HashMap<>();
// Base predicate which is fixed for every change query.
Predicate basePredicate =
and(ChangePredicates.project(projectName), ChangePredicates.ref(branch), open());
int maxLeafPredicates = indexConfig.maxTerms() - basePredicate.getLeafCount();
// List of predicates by which we want to find open changes for the branch. These predicates
// will be combined with the 'or' operator.
List> predicates = new ArrayList<>(maxLeafPredicates);
RevCommit commit;
int skippedCommits = 0;
int walkedCommits = 0;
while ((commit = rw.next()) != null) {
if (input.skipCommits != null && skippedCommits < input.skipCommits) {
skippedCommits++;
continue;
}
if (walkedCommits >= maxCommits) {
break;
}
walkedCommits++;
ObjectId commitId = commit.copy();
mergedSha1s.add(commitId);
// Consider all Change-Id lines since this is what ReceiveCommits#autoCloseChanges does.
List changeIds = changeUtil.getChangeIdsFromFooter(commit);
// Number of predicates that we need to add for this commit, 1 per Change-Id plus one for
// the commit.
int newPredicatesCount = changeIds.size() + 1;
// We accumulated the max number of query terms that can be used in one query, execute
// the query and start a new one.
if (predicates.size() + newPredicatesCount > maxLeafPredicates) {
autoCloseableChanges.addAll(
executeQueryAndAutoCloseChanges(
basePredicate, seenChanges, predicates, fix, changeIdToMergedSha1, mergedSha1s));
mergedSha1s.clear();
changeIdToMergedSha1.clear();
predicates.clear();
if (newPredicatesCount > maxLeafPredicates) {
// Whee, a single commit generates more than maxLeafPredicates predicates. Give up.
throw new ResourceConflictException(
String.format(
"commit %s contains more Change-Ids than we can handle", commit.name()));
}
}
changeIds.forEach(
changeId -> {
// It can happen that there are multiple merged commits with the same Change-Id
// footer (e.g. if a change was cherry-picked to a stable branch stable branch which
// then got merged back into master, or just by directly pushing several commits
// with the same Change-Id). In this case it is hard to say which of the commits
// should be used to auto-close an open change with the same Change-Id (and branch).
// Possible approaches are:
// 1. use the oldest commit with that Change-Id to auto-close the change
// 2. use the newest commit with that Change-Id to auto-close the change
// Possibility 1. has the disadvantage that the commit may have been merged before
// the change was created in which case it is strange how it could auto-close the
// change. Also this strategy would require to walk all commits since otherwise we
// cannot be sure that we have seen the oldest commit with that Change-Id.
// Possibility 2 has the disadvantage that it doesn't produce the same result as if
// auto-closing on push would have worked, since on direct push the first commit with
// a Change-Id of an open change would have closed that change. Also for this we
// would need to consider all commits that are skipped.
// Since both possibilities are not perfect and require extra effort we choose the
// easiest approach, which is use the newest commit with that Change-Id that we have
// seen (this means we ignore skipped commits). This should be okay since the
// important thing for callers is that auto-closable changes are closed. Which of the
// commits is used to auto-close a change if there are several candidates is of minor
// importance and hence can be non-deterministic.
Change.Key changeKey = Change.key(changeId);
if (!changeIdToMergedSha1.containsKey(changeKey)) {
changeIdToMergedSha1.put(changeKey, commitId);
}
// Find changes that have a matching Change-Id.
predicates.add(ChangePredicates.idPrefix(changeId));
});
// Find changes that have a matching commit.
predicates.add(ChangePredicates.commitPrefix(commit.name()));
}
if (!predicates.isEmpty()) {
// Execute the query with the remaining predicates that were collected.
autoCloseableChanges.addAll(
executeQueryAndAutoCloseChanges(
basePredicate, seenChanges, predicates, fix, changeIdToMergedSha1, mergedSha1s));
}
}
r.autoCloseableChanges = autoCloseableChanges;
return r;
}
private ImmutableList executeQueryAndAutoCloseChanges(
Predicate basePredicate,
Set seenChanges,
List> predicates,
boolean fix,
Map changeIdToMergedSha1,
List mergedSha1s) {
if (predicates.isEmpty()) {
return ImmutableList.of();
}
try {
List queryResult =
retryHelper
.changeIndexQuery(
"projectsConsistencyCheckerQueryChanges",
q ->
q.setRequestedFields(ChangeField.CHANGE_SPEC, ChangeField.PATCH_SET_SPEC)
.query(and(basePredicate, or(predicates))))
.call();
// Result for this query that we want to return to the client.
ImmutableList.Builder autoCloseableChangesByBranch = ImmutableList.builder();
for (ChangeData autoCloseableChange : queryResult) {
// Skip changes that we have already processed, either by this query or by
// earlier queries.
if (seenChanges.add(autoCloseableChange.getId())) {
retryHelper
.changeUpdate(
"projectsConsistencyCheckerAutoCloseChanges",
() -> {
// Auto-close by change
if (changeIdToMergedSha1.containsKey(autoCloseableChange.change().getKey())) {
autoCloseableChangesByBranch.add(
changeJson(
fix,
changeIdToMergedSha1.get(autoCloseableChange.change().getKey()))
.format(autoCloseableChange));
return null;
}
// Auto-close by commit
for (ObjectId patchSetSha1 :
autoCloseableChange.patchSets().stream()
.map(PatchSet::commitId)
.collect(toSet())) {
if (mergedSha1s.contains(patchSetSha1)) {
autoCloseableChangesByBranch.add(
changeJson(fix, patchSetSha1).format(autoCloseableChange));
break;
}
}
return null;
})
.call();
}
}
return autoCloseableChangesByBranch.build();
} catch (Exception e) {
Throwables.throwIfUnchecked(e);
throw new StorageException(e);
}
}
private ChangeJson changeJson(Boolean fix, ObjectId mergedAs) {
ChangeJson changeJson = changeJsonFactory.create(ListChangesOption.CHECK);
if (fix != null && fix.booleanValue()) {
FixInput fixInput = new FixInput();
fixInput.expectMergedAs = mergedAs.name();
changeJson.fix(fixInput);
}
return changeJson;
}
}
