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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.change;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.auto.value.AutoValue;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.cache.Cache;
import com.google.common.cache.Weigher;
import com.google.common.collect.FluentIterable;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.entities.Change;
import com.google.gerrit.entities.PatchSet;
import com.google.gerrit.entities.Project;
import com.google.gerrit.exceptions.StorageException;
import com.google.gerrit.extensions.client.ChangeKind;
import com.google.gerrit.proto.Protos;
import com.google.gerrit.server.cache.CacheModule;
import com.google.gerrit.server.cache.proto.Cache.ChangeKindKeyProto;
import com.google.gerrit.server.cache.serialize.CacheSerializer;
import com.google.gerrit.server.cache.serialize.EnumCacheSerializer;
import com.google.gerrit.server.cache.serialize.ObjectIdConverter;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.gerrit.server.git.GitRepositoryManager;
import com.google.gerrit.server.git.InMemoryInserter;
import com.google.gerrit.server.git.MergeUtil;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.inject.Inject;
import com.google.inject.Module;
import com.google.inject.name.Named;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import org.eclipse.jgit.errors.LargeObjectException;
import org.eclipse.jgit.lib.AnyObjectId;
import org.eclipse.jgit.lib.Config;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectInserter;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.merge.ThreeWayMerger;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevWalk;
public class ChangeKindCacheImpl implements ChangeKindCache {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
private static final String ID_CACHE = "change_kind";
public static Module module() {
return new CacheModule() {
@Override
protected void configure() {
bind(ChangeKindCache.class).to(ChangeKindCacheImpl.class);
persist(ID_CACHE, Key.class, ChangeKind.class)
.maximumWeight(2 << 20)
.weigher(ChangeKindWeigher.class)
.version(1)
.keySerializer(new Key.Serializer())
.valueSerializer(new EnumCacheSerializer<>(ChangeKind.class));
}
};
}
public static class NoCache implements ChangeKindCache {
private final boolean useRecursiveMerge;
private final ChangeData.Factory changeDataFactory;
private final GitRepositoryManager repoManager;
@Inject
NoCache(
@GerritServerConfig Config serverConfig,
ChangeData.Factory changeDataFactory,
GitRepositoryManager repoManager) {
this.useRecursiveMerge = MergeUtil.useRecursiveMerge(serverConfig);
this.changeDataFactory = changeDataFactory;
this.repoManager = repoManager;
}
@Override
public ChangeKind getChangeKind(
Project.NameKey project,
@Nullable RevWalk rw,
@Nullable Config repoConfig,
ObjectId prior,
ObjectId next) {
try {
Key key = Key.create(prior, next, useRecursiveMerge);
return new Loader(key, repoManager, project, rw, repoConfig).call();
} catch (IOException e) {
logger.atWarning().withCause(e).log(
"Cannot check trivial rebase of new patch set %s in %s", next.name(), project);
return ChangeKind.REWORK;
}
}
@Override
public ChangeKind getChangeKind(Change change, PatchSet patch) {
return getChangeKindInternal(this, change, patch, changeDataFactory, repoManager);
}
@Override
public ChangeKind getChangeKind(
@Nullable RevWalk rw, @Nullable Config repoConfig, ChangeData cd, PatchSet patch) {
return getChangeKindInternal(this, rw, repoConfig, cd, patch);
}
}
@AutoValue
public abstract static class Key {
public static Key create(AnyObjectId prior, AnyObjectId next, String strategyName) {
return new AutoValue_ChangeKindCacheImpl_Key(prior.copy(), next.copy(), strategyName);
}
private static Key create(AnyObjectId prior, AnyObjectId next, boolean useRecursiveMerge) {
return create(prior, next, MergeUtil.mergeStrategyName(true, useRecursiveMerge));
}
public abstract ObjectId prior();
public abstract ObjectId next();
public abstract String strategyName();
@VisibleForTesting
static class Serializer implements CacheSerializer {
@Override
public byte[] serialize(Key object) {
ObjectIdConverter idConverter = ObjectIdConverter.create();
return Protos.toByteArray(
ChangeKindKeyProto.newBuilder()
.setPrior(idConverter.toByteString(object.prior()))
.setNext(idConverter.toByteString(object.next()))
.setStrategyName(object.strategyName())
.build());
}
@Override
public Key deserialize(byte[] in) {
ChangeKindKeyProto proto = Protos.parseUnchecked(ChangeKindKeyProto.parser(), in);
ObjectIdConverter idConverter = ObjectIdConverter.create();
return create(
idConverter.fromByteString(proto.getPrior()),
idConverter.fromByteString(proto.getNext()),
proto.getStrategyName());
}
}
}
private static class Loader implements Callable {
private final Key key;
private final GitRepositoryManager repoManager;
private final Project.NameKey projectName;
private final RevWalk alreadyOpenRw;
private final Config repoConfig;
private Loader(
Key key,
GitRepositoryManager repoManager,
Project.NameKey projectName,
@Nullable RevWalk rw,
@Nullable Config repoConfig) {
checkArgument(
(rw == null && repoConfig == null) || (rw != null && repoConfig != null),
"must either provide both revwalk/config, or neither; got %s/%s",
rw,
repoConfig);
this.key = key;
this.repoManager = repoManager;
this.projectName = projectName;
this.alreadyOpenRw = rw;
this.repoConfig = repoConfig;
}
@SuppressWarnings("resource") // Resources are manually managed.
@Override
public ChangeKind call() throws IOException {
if (Objects.equals(key.prior(), key.next())) {
return ChangeKind.NO_CODE_CHANGE;
}
RevWalk rw = alreadyOpenRw;
Config config = repoConfig;
Repository repo = null;
if (alreadyOpenRw == null) {
repo = repoManager.openRepository(projectName);
rw = new RevWalk(repo);
config = repo.getConfig();
}
try {
RevCommit prior = rw.parseCommit(key.prior());
rw.parseBody(prior);
RevCommit next = rw.parseCommit(key.next());
rw.parseBody(next);
if (!next.getFullMessage().equals(prior.getFullMessage())) {
if (isSameDeltaAndTree(rw, prior, next)) {
return ChangeKind.NO_CODE_CHANGE;
}
return ChangeKind.REWORK;
}
if (isSameDeltaAndTree(rw, prior, next)) {
return ChangeKind.NO_CHANGE;
}
if (prior.getParentCount() == 0 || next.getParentCount() == 0) {
// At this point we have considered all the kinds that could be applicable to root
// commits; the remainder of the checks in this method all assume that both commits have
// at least one parent.
return ChangeKind.REWORK;
}
if ((prior.getParentCount() > 1 || next.getParentCount() > 1)
&& !onlyFirstParentChanged(prior, next)) {
// Trivial rebases done by machine only work well on 1 parent.
return ChangeKind.REWORK;
}
// A trivial rebase can be detected by looking for the next commit
// having the same tree as would exist when the prior commit is
// cherry-picked onto the next commit's new first parent.
try (ObjectInserter ins = new InMemoryInserter(rw.getObjectReader())) {
ThreeWayMerger merger = MergeUtil.newThreeWayMerger(ins, config, key.strategyName());
merger.setBase(prior.getParent(0));
if (merger.merge(next.getParent(0), prior)
&& merger.getResultTreeId().equals(next.getTree())) {
if (prior.getParentCount() == 1) {
return ChangeKind.TRIVIAL_REBASE;
}
return ChangeKind.MERGE_FIRST_PARENT_UPDATE;
}
} catch (LargeObjectException e) {
// Some object is too large for the merge attempt to succeed. Assume
// it was a rework.
}
return ChangeKind.REWORK;
} finally {
if (repo != null) {
rw.close();
repo.close();
}
}
}
public static boolean onlyFirstParentChanged(RevCommit prior, RevCommit next) {
return !sameFirstParents(prior, next) && sameRestOfParents(prior, next);
}
private static boolean sameFirstParents(RevCommit prior, RevCommit next) {
if (prior.getParentCount() == 0) {
return next.getParentCount() == 0;
}
return prior.getParent(0).equals(next.getParent(0));
}
private static boolean sameRestOfParents(RevCommit prior, RevCommit next) {
Set priorRestParents = allExceptFirstParent(prior.getParents());
Set nextRestParents = allExceptFirstParent(next.getParents());
return priorRestParents.equals(nextRestParents);
}
private static Set allExceptFirstParent(RevCommit[] parents) {
return FluentIterable.from(Arrays.asList(parents)).skip(1).toSet();
}
private static boolean isSameDeltaAndTree(RevWalk rw, RevCommit prior, RevCommit next)
throws IOException {
if (!Objects.equals(next.getTree(), prior.getTree())) {
return false;
}
if (prior.getParentCount() != next.getParentCount()) {
return false;
} else if (prior.getParentCount() == 0) {
return true;
}
// Make sure that the prior/next delta is the same - not just the tree.
// This is done by making sure that the parent trees are equal.
for (int i = 0; i < prior.getParentCount(); i++) {
// Parse parent commits so that their trees are available.
rw.parseCommit(prior.getParent(i));
rw.parseCommit(next.getParent(i));
if (!Objects.equals(next.getParent(i).getTree(), prior.getParent(i).getTree())) {
return false;
}
}
return true;
}
}
public static class ChangeKindWeigher implements Weigher {
@Override
public int weigh(Key key, ChangeKind changeKind) {
return 16
+ 2 * 36
+ 2 * key.strategyName().length() // Size of Key, 64 bit JVM
+ 2 * changeKind.name().length(); // Size of ChangeKind, 64 bit JVM
}
}
private final Cache cache;
private final boolean useRecursiveMerge;
private final ChangeData.Factory changeDataFactory;
private final GitRepositoryManager repoManager;
@Inject
ChangeKindCacheImpl(
@GerritServerConfig Config serverConfig,
@Named(ID_CACHE) Cache cache,
ChangeData.Factory changeDataFactory,
GitRepositoryManager repoManager) {
this.cache = cache;
this.useRecursiveMerge = MergeUtil.useRecursiveMerge(serverConfig);
this.changeDataFactory = changeDataFactory;
this.repoManager = repoManager;
}
@Override
public ChangeKind getChangeKind(
Project.NameKey project,
@Nullable RevWalk rw,
@Nullable Config repoConfig,
ObjectId prior,
ObjectId next) {
try {
Key key = Key.create(prior, next, useRecursiveMerge);
ChangeKind kind = cache.get(key, new Loader(key, repoManager, project, rw, repoConfig));
logger.atFine().log("Change kind of new patch set %s in %s: %s", next.name(), project, kind);
return kind;
} catch (ExecutionException e) {
logger.atWarning().withCause(e).log(
"Cannot check change kind of new patch set %s in %s", next.name(), project);
return ChangeKind.REWORK;
}
}
@Override
public ChangeKind getChangeKind(Change change, PatchSet patch) {
return getChangeKindInternal(this, change, patch, changeDataFactory, repoManager);
}
@Override
public ChangeKind getChangeKind(
@Nullable RevWalk rw, @Nullable Config repoConfig, ChangeData cd, PatchSet patch) {
return getChangeKindInternal(this, rw, repoConfig, cd, patch);
}
private static ChangeKind getChangeKindInternal(
ChangeKindCache cache,
@Nullable RevWalk rw,
@Nullable Config repoConfig,
ChangeData change,
PatchSet patch) {
ChangeKind kind = ChangeKind.REWORK;
// Trivial case: if we're on the first patch, we don't need to use
// the repository.
if (patch.id().get() > 1) {
try {
Collection patchSetCollection = change.patchSets();
PatchSet priorPs = patch;
for (PatchSet ps : patchSetCollection) {
if (ps.id().get() < patch.id().get()
&& (ps.id().get() > priorPs.id().get() || priorPs == patch)) {
// We only want the previous patch set, so walk until the last one
priorPs = ps;
}
}
// If we still think the previous patch is the current patch,
// we only have one patch set. Return the default.
// This can happen if a user creates a draft, uploads a second patch,
// and deletes the draft.
if (priorPs != patch) {
kind =
cache.getChangeKind(
change.project(), rw, repoConfig, priorPs.commitId(), patch.commitId());
}
} catch (StorageException e) {
// Do nothing; assume we have a complex change
logger.atWarning().withCause(e).log(
"Unable to get change kind for patchSet %s of change %s",
patch.number(), change.getId());
}
}
logger.atFine().log(
"Change kind for patchSet %s of change %s: %s", patch.number(), change.getId(), kind);
return kind;
}
private static ChangeKind getChangeKindInternal(
ChangeKindCache cache,
Change change,
PatchSet patch,
ChangeData.Factory changeDataFactory,
GitRepositoryManager repoManager) {
// TODO - dborowitz: add NEW_CHANGE type for default.
ChangeKind kind = ChangeKind.REWORK;
// Trivial case: if we're on the first patch, we don't need to open
// the repository.
if (patch.id().get() > 1) {
try (Repository repo = repoManager.openRepository(change.getProject());
RevWalk rw = new RevWalk(repo)) {
kind =
getChangeKindInternal(
cache, rw, repo.getConfig(), changeDataFactory.create(change), patch);
} catch (IOException e) {
// Do nothing; assume we have a complex change
logger.atWarning().withCause(e).log(
"Unable to get change kind for patchSet %s of change %s",
patch.number(), change.getChangeId());
}
}
logger.atFine().log(
"Change kind for patchSet %s of change %s: %s", patch.number(), change.getChangeId(), kind);
return kind;
}
}
