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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.notedb;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.gerrit.reviewdb.client.RefNames.changeMetaRef;
import static com.google.gerrit.server.notedb.NoteDbTable.CHANGES;
import static java.util.Comparator.comparing;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableListMultimap;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ImmutableSortedMap;
import com.google.common.collect.ImmutableSortedSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.common.collect.Multimaps;
import com.google.common.collect.Ordering;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.common.data.SubmitRecord;
import com.google.gerrit.metrics.Timer1;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.Branch;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.ChangeMessage;
import com.google.gerrit.reviewdb.client.Comment;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.client.PatchSetApproval;
import com.google.gerrit.reviewdb.client.Project;
import com.google.gerrit.reviewdb.client.RefNames;
import com.google.gerrit.reviewdb.client.RevId;
import com.google.gerrit.reviewdb.client.RobotComment;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.reviewdb.server.ReviewDbUtil;
import com.google.gerrit.server.ReviewerSet;
import com.google.gerrit.server.ReviewerStatusUpdate;
import com.google.gerrit.server.git.RefCache;
import com.google.gerrit.server.git.RepoRefCache;
import com.google.gerrit.server.notedb.NoteDbChangeState.PrimaryStorage;
import com.google.gerrit.server.notedb.rebuild.ChangeRebuilder;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.project.ProjectCache;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.InternalChangeQuery;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.function.Predicate;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/** View of a single {@link Change} based on the log of its notes branch. */
public class ChangeNotes extends AbstractChangeNotes {
private static final Logger log = LoggerFactory.getLogger(ChangeNotes.class);
static final Ordering PSA_BY_TIME =
Ordering.from(comparing(PatchSetApproval::getGranted));
public static final Ordering MESSAGE_BY_TIME =
Ordering.from(comparing(ChangeMessage::getWrittenOn));
public static ConfigInvalidException parseException(
Change.Id changeId, String fmt, Object... args) {
return new ConfigInvalidException("Change " + changeId + ": " + String.format(fmt, args));
}
public static Change readOneReviewDbChange(ReviewDb db, Change.Id id) throws OrmException {
return ReviewDbUtil.unwrapDb(db).changes().get(id);
}
@Singleton
public static class Factory {
private final Args args;
private final Provider queryProvider;
private final ProjectCache projectCache;
@VisibleForTesting
@Inject
public Factory(
Args args, Provider queryProvider, ProjectCache projectCache) {
this.args = args;
this.queryProvider = queryProvider;
this.projectCache = projectCache;
}
public ChangeNotes createChecked(ReviewDb db, Change c) throws OrmException {
return createChecked(db, c.getProject(), c.getId());
}
public ChangeNotes createChecked(ReviewDb db, Project.NameKey project, Change.Id changeId)
throws OrmException {
Change change = readOneReviewDbChange(db, changeId);
if (change == null) {
if (!args.migration.readChanges()) {
throw new NoSuchChangeException(changeId);
}
// Change isn't in ReviewDb, but its primary storage might be in NoteDb.
// Prepopulate the change exists with proper noteDbState field.
change = newNoteDbOnlyChange(project, changeId);
} else if (!change.getProject().equals(project)) {
throw new NoSuchChangeException(changeId);
}
return new ChangeNotes(args, change).load();
}
public ChangeNotes createChecked(Change.Id changeId) throws OrmException {
InternalChangeQuery query = queryProvider.get().noFields();
List changes = query.byLegacyChangeId(changeId);
if (changes.isEmpty()) {
throw new NoSuchChangeException(changeId);
}
if (changes.size() != 1) {
log.error("Multiple changes found for {}", changeId.get());
throw new NoSuchChangeException(changeId);
}
return changes.get(0).notes();
}
public static Change newNoteDbOnlyChange(Project.NameKey project, Change.Id changeId) {
Change change =
new Change(
null, changeId, null, new Branch.NameKey(project, "INVALID_NOTE_DB_ONLY"), null);
change.setNoteDbState(NoteDbChangeState.NOTE_DB_PRIMARY_STATE);
return change;
}
private Change loadChangeFromDb(ReviewDb db, Project.NameKey project, Change.Id changeId)
throws OrmException {
checkArgument(project != null, "project is required");
Change change = readOneReviewDbChange(db, changeId);
if (change == null) {
if (args.migration.readChanges()) {
return newNoteDbOnlyChange(project, changeId);
}
throw new NoSuchChangeException(changeId);
}
checkArgument(
change.getProject().equals(project),
"passed project %s when creating ChangeNotes for %s, but actual project is %s",
project,
changeId,
change.getProject());
return change;
}
public ChangeNotes create(ReviewDb db, Project.NameKey project, Change.Id changeId)
throws OrmException {
return new ChangeNotes(args, loadChangeFromDb(db, project, changeId)).load();
}
public ChangeNotes createWithAutoRebuildingDisabled(
ReviewDb db, Project.NameKey project, Change.Id changeId) throws OrmException {
return new ChangeNotes(args, loadChangeFromDb(db, project, changeId), true, false, null)
.load();
}
/**
* Create change notes for a change that was loaded from index. This method should only be used
* when database access is harmful and potentially stale data from the index is acceptable.
*
* @param change change loaded from secondary index
* @return change notes
*/
public ChangeNotes createFromIndexedChange(Change change) {
return new ChangeNotes(args, change);
}
public ChangeNotes createForBatchUpdate(Change change, boolean shouldExist)
throws OrmException {
return new ChangeNotes(args, change, shouldExist, false, null).load();
}
public ChangeNotes createWithAutoRebuildingDisabled(Change change, RefCache refs)
throws OrmException {
return new ChangeNotes(args, change, true, false, refs).load();
}
// TODO(ekempin): Remove when database backend is deleted
/**
* Instantiate ChangeNotes for a change that has been loaded by a batch read from the database.
*/
private ChangeNotes createFromChangeOnlyWhenNoteDbDisabled(Change change) throws OrmException {
checkState(
!args.migration.readChanges(),
"do not call createFromChangeWhenNoteDbDisabled when NoteDb is enabled");
return new ChangeNotes(args, change).load();
}
public List create(ReviewDb db, Collection changeIds)
throws OrmException {
List notes = new ArrayList<>();
if (args.migration.enabled()) {
for (Change.Id changeId : changeIds) {
try {
notes.add(createChecked(changeId));
} catch (NoSuchChangeException e) {
// Ignore missing changes to match Access#get(Iterable) behavior.
}
}
return notes;
}
for (Change c : ReviewDbUtil.unwrapDb(db).changes().get(changeIds)) {
notes.add(createFromChangeOnlyWhenNoteDbDisabled(c));
}
return notes;
}
public List create(
ReviewDb db,
Project.NameKey project,
Collection changeIds,
Predicate predicate)
throws OrmException {
List notes = new ArrayList<>();
if (args.migration.enabled()) {
for (Change.Id cid : changeIds) {
ChangeNotes cn = create(db, project, cid);
if (cn.getChange() != null && predicate.test(cn)) {
notes.add(cn);
}
}
return notes;
}
for (Change c : ReviewDbUtil.unwrapDb(db).changes().get(changeIds)) {
if (c != null && project.equals(c.getDest().getParentKey())) {
ChangeNotes cn = createFromChangeOnlyWhenNoteDbDisabled(c);
if (predicate.test(cn)) {
notes.add(cn);
}
}
}
return notes;
}
public ListMultimap create(
ReviewDb db, Predicate predicate) throws IOException, OrmException {
ListMultimap m =
MultimapBuilder.hashKeys().arrayListValues().build();
if (args.migration.readChanges()) {
for (Project.NameKey project : projectCache.all()) {
try (Repository repo = args.repoManager.openRepository(project)) {
List changes = scanNoteDb(repo, db, project);
for (ChangeNotes cn : changes) {
if (predicate.test(cn)) {
m.put(project, cn);
}
}
}
}
} else {
for (Change change : ReviewDbUtil.unwrapDb(db).changes().all()) {
ChangeNotes notes = createFromChangeOnlyWhenNoteDbDisabled(change);
if (predicate.test(notes)) {
m.put(change.getProject(), notes);
}
}
}
return ImmutableListMultimap.copyOf(m);
}
public List scan(Repository repo, ReviewDb db, Project.NameKey project)
throws OrmException, IOException {
if (!args.migration.readChanges()) {
return scanDb(repo, db);
}
return scanNoteDb(repo, db, project);
}
private List scanDb(Repository repo, ReviewDb db)
throws OrmException, IOException {
Set ids = scan(repo);
List notes = new ArrayList<>(ids.size());
// A batch size of N may overload get(Iterable), so use something smaller,
// but still >1.
for (List batch : Iterables.partition(ids, 30)) {
for (Change change : ReviewDbUtil.unwrapDb(db).changes().get(batch)) {
notes.add(createFromChangeOnlyWhenNoteDbDisabled(change));
}
}
return notes;
}
private List scanNoteDb(Repository repo, ReviewDb db, Project.NameKey project)
throws OrmException, IOException {
Set ids = scan(repo);
List changeNotes = new ArrayList<>(ids.size());
PrimaryStorage defaultStorage = args.migration.changePrimaryStorage();
for (Change.Id id : ids) {
Change change = readOneReviewDbChange(db, id);
if (change == null) {
if (defaultStorage == PrimaryStorage.REVIEW_DB) {
log.warn("skipping change {} found in project {} but not in ReviewDb", id, project);
continue;
}
// TODO(dborowitz): See discussion in BatchUpdate#newChangeContext.
change = newNoteDbOnlyChange(project, id);
} else if (!change.getProject().equals(project)) {
log.error(
"skipping change {} found in project {} because ReviewDb change has project {}",
id,
project,
change.getProject());
continue;
}
log.debug("adding change {} found in project {}", id, project);
changeNotes.add(new ChangeNotes(args, change).load());
}
return changeNotes;
}
public static Set scan(Repository repo) throws IOException {
Map refs = repo.getRefDatabase().getRefs(RefNames.REFS_CHANGES);
Set ids = new HashSet<>(refs.size());
for (Ref r : refs.values()) {
Change.Id id = Change.Id.fromRef(r.getName());
if (id != null) {
ids.add(id);
}
}
return ids;
}
}
private final boolean shouldExist;
private final RefCache refs;
private Change change;
private ChangeNotesState state;
// Parsed note map state, used by ChangeUpdate to make in-place editing of
// notes easier.
RevisionNoteMap revisionNoteMap;
private NoteDbUpdateManager.Result rebuildResult;
private DraftCommentNotes draftCommentNotes;
private RobotCommentNotes robotCommentNotes;
// Lazy defensive copies of mutable ReviewDb types, to avoid polluting the
// ChangeNotesCache from handlers.
private ImmutableSortedMap patchSets;
private ImmutableListMultimap approvals;
private ImmutableSet commentKeys;
@VisibleForTesting
public ChangeNotes(Args args, Change change) {
this(args, change, true, true, null);
}
private ChangeNotes(
Args args, Change change, boolean shouldExist, boolean autoRebuild, @Nullable RefCache refs) {
super(args, change.getId(), PrimaryStorage.of(change), autoRebuild);
this.change = new Change(change);
this.shouldExist = shouldExist;
this.refs = refs;
}
public Change getChange() {
return change;
}
public ObjectId getMetaId() {
return state.metaId();
}
public ImmutableSortedMap getPatchSets() {
if (patchSets == null) {
ImmutableSortedMap.Builder b =
ImmutableSortedMap.orderedBy(comparing(PatchSet.Id::get));
for (Map.Entry e : state.patchSets()) {
b.put(e.getKey(), new PatchSet(e.getValue()));
}
patchSets = b.build();
}
return patchSets;
}
public ImmutableListMultimap getApprovals() {
if (approvals == null) {
ImmutableListMultimap.Builder b =
ImmutableListMultimap.builder();
for (Map.Entry e : state.approvals()) {
b.put(e.getKey(), new PatchSetApproval(e.getValue()));
}
approvals = b.build();
}
return approvals;
}
public ReviewerSet getReviewers() {
return state.reviewers();
}
public ImmutableList getReviewerUpdates() {
return state.reviewerUpdates();
}
/** @return an ImmutableSet of Account.Ids of all users that have been assigned to this change. */
public ImmutableSet getPastAssignees() {
return state.pastAssignees();
}
/** @return a ImmutableSet of all hashtags for this change sorted in alphabetical order. */
public ImmutableSet getHashtags() {
return ImmutableSortedSet.copyOf(state.hashtags());
}
/** @return a list of all users who have ever been a reviewer on this change. */
public ImmutableList getAllPastReviewers() {
return state.allPastReviewers();
}
/**
* @return submit records stored during the most recent submit; only for changes that were
* actually submitted.
*/
public ImmutableList getSubmitRecords() {
return state.submitRecords();
}
/** @return all change messages, in chronological order, oldest first. */
public ImmutableList getChangeMessages() {
return state.allChangeMessages();
}
/** @return change messages by patch set, in chronological order, oldest first. */
public ImmutableListMultimap getChangeMessagesByPatchSet() {
return state.changeMessagesByPatchSet();
}
/** @return inline comments on each revision. */
public ImmutableListMultimap getComments() {
return state.publishedComments();
}
public ImmutableSet getCommentKeys() {
if (commentKeys == null) {
ImmutableSet.Builder b = ImmutableSet.builder();
for (Comment c : getComments().values()) {
b.add(new Comment.Key(c.key));
}
commentKeys = b.build();
}
return commentKeys;
}
public ImmutableListMultimap getDraftComments(Account.Id author)
throws OrmException {
return getDraftComments(author, null);
}
public ImmutableListMultimap getDraftComments(
Account.Id author, @Nullable Ref ref) throws OrmException {
loadDraftComments(author, ref);
// Filter out any zombie draft comments. These are drafts that are also in
// the published map, and arise when the update to All-Users to delete them
// during the publish operation failed.
return ImmutableListMultimap.copyOf(
Multimaps.filterEntries(
draftCommentNotes.getComments(), e -> !getCommentKeys().contains(e.getValue().key)));
}
public ImmutableListMultimap getRobotComments() throws OrmException {
loadRobotComments();
return robotCommentNotes.getComments();
}
/**
* If draft comments have already been loaded for this author, then they will not be reloaded.
* However, this method will load the comments if no draft comments have been loaded or if the
* caller would like the drafts for another author.
*/
private void loadDraftComments(Account.Id author, @Nullable Ref ref) throws OrmException {
if (draftCommentNotes == null || !author.equals(draftCommentNotes.getAuthor()) || ref != null) {
draftCommentNotes =
new DraftCommentNotes(args, change, author, autoRebuild, rebuildResult, ref);
draftCommentNotes.load();
}
}
private void loadRobotComments() throws OrmException {
if (robotCommentNotes == null) {
robotCommentNotes = new RobotCommentNotes(args, change);
robotCommentNotes.load();
}
}
@VisibleForTesting
DraftCommentNotes getDraftCommentNotes() {
return draftCommentNotes;
}
public RobotCommentNotes getRobotCommentNotes() {
return robotCommentNotes;
}
public boolean containsComment(Comment c) throws OrmException {
if (containsCommentPublished(c)) {
return true;
}
loadDraftComments(c.author.getId(), null);
return draftCommentNotes.containsComment(c);
}
public boolean containsCommentPublished(Comment c) {
for (Comment l : getComments().values()) {
if (c.key.equals(l.key)) {
return true;
}
}
return false;
}
@Override
public String getRefName() {
return changeMetaRef(getChangeId());
}
public PatchSet getCurrentPatchSet() {
PatchSet.Id psId = change.currentPatchSetId();
return checkNotNull(getPatchSets().get(psId), "missing current patch set %s", psId.get());
}
@VisibleForTesting
public Timestamp getReadOnlyUntil() {
return state.readOnlyUntil();
}
@Override
protected void onLoad(LoadHandle handle)
throws NoSuchChangeException, IOException, ConfigInvalidException {
ObjectId rev = handle.id();
if (rev == null) {
if (args.migration.readChanges()
&& PrimaryStorage.of(change) == PrimaryStorage.NOTE_DB
&& shouldExist) {
throw new NoSuchChangeException(getChangeId());
}
loadDefaults();
return;
}
ChangeNotesCache.Value v =
args.cache.get().get(getProjectName(), getChangeId(), rev, handle.walk());
state = v.state();
state.copyColumnsTo(change);
revisionNoteMap = v.revisionNoteMap();
}
@Override
protected void loadDefaults() {
state = ChangeNotesState.empty(change);
}
@Override
public Project.NameKey getProjectName() {
return change.getProject();
}
@Override
protected ObjectId readRef(Repository repo) throws IOException {
return refs != null ? refs.get(getRefName()).orElse(null) : super.readRef(repo);
}
@Override
protected LoadHandle openHandle(Repository repo) throws NoSuchChangeException, IOException {
if (autoRebuild) {
NoteDbChangeState state = NoteDbChangeState.parse(change);
ObjectId id = readRef(repo);
if (id == null) {
if (state == null) {
return super.openHandle(repo, id);
} else if (shouldExist) {
throw new NoSuchChangeException(getChangeId());
}
}
RefCache refs = this.refs != null ? this.refs : new RepoRefCache(repo);
if (!NoteDbChangeState.isChangeUpToDate(state, refs, getChangeId())) {
return rebuildAndOpen(repo, id);
}
}
return super.openHandle(repo);
}
private LoadHandle rebuildAndOpen(Repository repo, ObjectId oldId) throws IOException {
Timer1.Context timer = args.metrics.autoRebuildLatency.start(CHANGES);
try {
Change.Id cid = getChangeId();
ReviewDb db = args.db.get();
ChangeRebuilder rebuilder = args.rebuilder.get();
NoteDbUpdateManager.Result r;
try (NoteDbUpdateManager manager = rebuilder.stage(db, cid)) {
if (manager == null) {
return super.openHandle(repo, oldId); // May be null in tests.
}
manager.setRefLogMessage("Auto-rebuilding change");
r = manager.stageAndApplyDelta(change);
try {
rebuilder.execute(db, cid, manager);
repo.scanForRepoChanges();
} catch (OrmException | IOException e) {
// Rebuilding failed. Most likely cause is contention on one or more
// change refs; there are other types of errors that can happen during
// rebuilding, but generally speaking they should happen during stage(),
// not execute(). Assume that some other worker is going to successfully
// store the rebuilt state, which is deterministic given an input
// ChangeBundle.
//
// Parse notes from the staged result so we can return something useful
// to the caller instead of throwing.
log.debug("Rebuilding change {} failed: {}", getChangeId(), e.getMessage());
args.metrics.autoRebuildFailureCount.increment(CHANGES);
rebuildResult = checkNotNull(r);
checkNotNull(r.newState());
checkNotNull(r.staged());
return LoadHandle.create(
ChangeNotesCommit.newStagedRevWalk(repo, r.staged().changeObjects()),
r.newState().getChangeMetaId());
}
}
return LoadHandle.create(ChangeNotesCommit.newRevWalk(repo), r.newState().getChangeMetaId());
} catch (NoSuchChangeException e) {
return super.openHandle(repo, oldId);
} catch (OrmException e) {
throw new IOException(e);
} finally {
log.debug(
"Rebuilt change {} in project {} in {} ms",
getChangeId(),
getProjectName(),
TimeUnit.MILLISECONDS.convert(timer.stop(), TimeUnit.NANOSECONDS));
}
}
}
