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// Copyright (C) 2013 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.query.change;
import com.google.gerrit.common.data.SubmitTypeRecord;
import com.google.gerrit.index.query.PostFilterPredicate;
import com.google.gerrit.index.query.Predicate;
import com.google.gerrit.index.query.QueryParseException;
import com.google.gerrit.reviewdb.client.BooleanProjectConfig;
import com.google.gerrit.reviewdb.client.Branch;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.server.git.CodeReviewCommit;
import com.google.gerrit.server.git.CodeReviewCommit.CodeReviewRevWalk;
import com.google.gerrit.server.project.NoSuchProjectException;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.project.ProjectState;
import com.google.gerrit.server.query.change.ChangeQueryBuilder.Arguments;
import com.google.gerrit.server.submit.IntegrationException;
import com.google.gerrit.server.submit.SubmitDryRun;
import com.google.gwtorm.server.OrmException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
public class ConflictsPredicate {
// UI code may depend on this string, so use caution when changing.
protected static final String TOO_MANY_FILES = "too many files to find conflicts";
private ConflictsPredicate() {}
public static Predicate create(Arguments args, String value, Change c)
throws QueryParseException, OrmException {
ChangeData cd;
List files;
try {
cd = args.changeDataFactory.create(args.db.get(), c);
files = cd.currentFilePaths();
} catch (IOException e) {
throw new OrmException(e);
}
if (3 + files.size() > args.indexConfig.maxTerms()) {
// Short-circuit with a nice error message if we exceed the index
// backend's term limit. This assumes that "conflicts:foo" is the entire
// query; if there are more terms in the input, we might not
// short-circuit here, which will result in a more generic error message
// later on in the query parsing.
throw new QueryParseException(TOO_MANY_FILES);
}
List> filePredicates = new ArrayList<>(files.size());
for (String file : files) {
filePredicates.add(new EqualsPathPredicate(ChangeQueryBuilder.FIELD_PATH, file));
}
List> and = new ArrayList<>(5);
and.add(new ProjectPredicate(c.getProject().get()));
and.add(new RefPredicate(c.getDest().get()));
and.add(Predicate.not(new LegacyChangeIdPredicate(c.getId())));
and.add(Predicate.or(filePredicates));
ChangeDataCache changeDataCache = new ChangeDataCache(cd, args.projectCache);
and.add(new CheckConflict(value, args, c, changeDataCache));
return Predicate.and(and);
}
private static final class CheckConflict extends PostFilterPredicate {
private final Arguments args;
private final Branch.NameKey dest;
private final ChangeDataCache changeDataCache;
CheckConflict(String value, Arguments args, Change c, ChangeDataCache changeDataCache) {
super(ChangeQueryBuilder.FIELD_CONFLICTS, value);
this.args = args;
this.dest = c.getDest();
this.changeDataCache = changeDataCache;
}
@Override
public boolean match(ChangeData object) throws OrmException {
Change otherChange = object.change();
if (otherChange == null || !otherChange.getDest().equals(dest)) {
return false;
}
SubmitTypeRecord str = object.submitTypeRecord();
if (!str.isOk()) {
return false;
}
ProjectState projectState;
try {
projectState = changeDataCache.getProjectState();
} catch (NoSuchProjectException e) {
return false;
}
ObjectId other = ObjectId.fromString(object.currentPatchSet().getRevision().get());
ConflictKey conflictsKey =
ConflictKey.create(
changeDataCache.getTestAgainst(),
other,
str.type,
projectState.is(BooleanProjectConfig.USE_CONTENT_MERGE));
Boolean maybeConflicts = args.conflictsCache.getIfPresent(conflictsKey);
if (maybeConflicts != null) {
return maybeConflicts;
}
try (Repository repo = args.repoManager.openRepository(otherChange.getProject());
CodeReviewRevWalk rw = CodeReviewCommit.newRevWalk(repo)) {
boolean conflicts =
!args.submitDryRun.run(
str.type,
repo,
rw,
otherChange.getDest(),
changeDataCache.getTestAgainst(),
other,
getAlreadyAccepted(repo, rw));
args.conflictsCache.put(conflictsKey, conflicts);
return conflicts;
} catch (IntegrationException | NoSuchProjectException | IOException e) {
throw new OrmException(e);
}
}
@Override
public int getCost() {
return 5;
}
private Set getAlreadyAccepted(Repository repo, RevWalk rw)
throws IntegrationException {
try {
Set accepted = new HashSet<>();
SubmitDryRun.addCommits(changeDataCache.getAlreadyAccepted(repo), rw, accepted);
ObjectId tip = changeDataCache.getTestAgainst();
if (tip != null) {
accepted.add(rw.parseCommit(tip));
}
return accepted;
} catch (OrmException | IOException e) {
throw new IntegrationException("Failed to determine already accepted commits.", e);
}
}
}
private static class ChangeDataCache {
private final ChangeData cd;
private final ProjectCache projectCache;
private ObjectId testAgainst;
private ProjectState projectState;
private Set alreadyAccepted;
ChangeDataCache(ChangeData cd, ProjectCache projectCache) {
this.cd = cd;
this.projectCache = projectCache;
}
ObjectId getTestAgainst() throws OrmException {
if (testAgainst == null) {
testAgainst = ObjectId.fromString(cd.currentPatchSet().getRevision().get());
}
return testAgainst;
}
ProjectState getProjectState() throws NoSuchProjectException {
if (projectState == null) {
projectState = projectCache.get(cd.project());
if (projectState == null) {
throw new NoSuchProjectException(cd.project());
}
}
return projectState;
}
Set getAlreadyAccepted(Repository repo) throws IOException {
if (alreadyAccepted == null) {
alreadyAccepted = SubmitDryRun.getAlreadyAccepted(repo);
}
return alreadyAccepted;
}
}
}
