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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.checkState;
import static com.google.gerrit.reviewdb.client.RefNames.changeMetaRef;
import static java.util.Comparator.comparing;
import static java.util.Objects.requireNonNull;
import com.google.auto.value.AutoValue;
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.ListMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.common.collect.Multimaps;
import com.google.common.collect.Ordering;
import com.google.common.collect.Sets;
import com.google.common.collect.Sets.SetView;
import com.google.common.flogger.FluentLogger;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.common.data.SubmitRecord;
import com.google.gerrit.exceptions.StorageException;
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.server.ReviewerByEmailSet;
import com.google.gerrit.server.ReviewerSet;
import com.google.gerrit.server.ReviewerStatusUpdate;
import com.google.gerrit.server.git.RefCache;
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.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Predicate;
import java.util.stream.Stream;
import org.eclipse.jgit.errors.ConfigInvalidException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
/** View of a single {@link Change} based on the log of its notes branch. */
public class ChangeNotes extends AbstractChangeNotes {
private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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));
}
@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(Change c) {
return createChecked(c.getProject(), c.getId());
}
public ChangeNotes createChecked(Project.NameKey project, Change.Id changeId) {
Change change = newChange(project, changeId);
return new ChangeNotes(args, change, true, null).load();
}
public ChangeNotes createChecked(Change.Id changeId) {
InternalChangeQuery query = queryProvider.get().noFields();
List changes = query.byLegacyChangeId(changeId);
if (changes.isEmpty()) {
throw new NoSuchChangeException(changeId);
}
if (changes.size() != 1) {
logger.atSevere().log("Multiple changes found for %d", changeId.get());
throw new NoSuchChangeException(changeId);
}
return changes.get(0).notes();
}
public static Change newChange(Project.NameKey project, Change.Id changeId) {
return new Change(
null, changeId, null, new Branch.NameKey(project, "INVALID_NOTE_DB_ONLY"), null);
}
public ChangeNotes create(Project.NameKey project, Change.Id changeId) {
checkArgument(project != null, "project is required");
return new ChangeNotes(args, newChange(project, changeId), true, 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, true, null);
}
public ChangeNotes createForBatchUpdate(Change change, boolean shouldExist) {
return new ChangeNotes(args, change, shouldExist, null).load();
}
public ChangeNotes create(Change change, RefCache refs) {
return new ChangeNotes(args, change, true, refs).load();
}
public List create(Collection changeIds) {
List notes = new ArrayList<>();
for (Change.Id changeId : changeIds) {
try {
notes.add(createChecked(changeId));
} catch (NoSuchChangeException e) {
// Ignore missing changes to match Access#get(Iterable) behavior.
}
}
return notes;
}
public List create(
Project.NameKey project,
Collection changeIds,
Predicate predicate) {
List notes = new ArrayList<>();
for (Change.Id cid : changeIds) {
try {
ChangeNotes cn = create(project, cid);
if (cn.getChange() != null && predicate.test(cn)) {
notes.add(cn);
}
} catch (NoSuchChangeException e) {
// Match ReviewDb behavior, returning not found; maybe the caller learned about it from
// a dangling patch set ref or something.
continue;
}
}
return notes;
}
public ListMultimap create(Predicate predicate)
throws IOException {
ListMultimap m =
MultimapBuilder.hashKeys().arrayListValues().build();
for (Project.NameKey project : projectCache.all()) {
try (Repository repo = args.repoManager.openRepository(project)) {
scan(repo, project)
.filter(r -> !r.error().isPresent())
.map(ChangeNotesResult::notes)
.filter(predicate)
.forEach(n -> m.put(n.getProjectName(), n));
}
}
return ImmutableListMultimap.copyOf(m);
}
public Stream scan(Repository repo, Project.NameKey project)
throws IOException {
return scan(repo, project, null);
}
public Stream scan(
Repository repo, Project.NameKey project, Predicate changeIdPredicate)
throws IOException {
ScanResult sr = scanChangeIds(repo);
Stream idStream = sr.all().stream();
if (changeIdPredicate != null) {
idStream = idStream.filter(changeIdPredicate);
}
return idStream.map(id -> scanOneChange(project, sr, id)).filter(Objects::nonNull);
}
private ChangeNotesResult scanOneChange(Project.NameKey project, ScanResult sr, Change.Id id) {
if (!sr.fromMetaRefs().contains(id)) {
// Stray patch set refs can happen due to normal error conditions, e.g. failed
// push processing, so aren't worth even a warning.
return null;
}
// TODO(dborowitz): See discussion in BatchUpdate#newChangeContext.
Change change = ChangeNotes.Factory.newChange(project, id);
logger.atFine().log("adding change %s found in project %s", id, project);
return toResult(change);
}
@Nullable
private ChangeNotesResult toResult(Change rawChangeFromNoteDb) {
ChangeNotes n = new ChangeNotes(args, rawChangeFromNoteDb, true, null);
try {
n.load();
} catch (StorageException e) {
return ChangeNotesResult.error(n.getChangeId(), e);
}
return ChangeNotesResult.notes(n);
}
/** Result of {@link #scan(Repository,Project.NameKey)}. */
@AutoValue
public abstract static class ChangeNotesResult {
static ChangeNotesResult error(Change.Id id, StorageException e) {
return new AutoValue_ChangeNotes_Factory_ChangeNotesResult(id, Optional.of(e), null);
}
static ChangeNotesResult notes(ChangeNotes notes) {
return new AutoValue_ChangeNotes_Factory_ChangeNotesResult(
notes.getChangeId(), Optional.empty(), notes);
}
/** Change ID that was scanned. */
public abstract Change.Id id();
/** Error encountered while loading this change, if any. */
public abstract Optional error();
/**
* Notes loaded for this change.
*
* @return notes.
* @throws IllegalStateException if there was an error loading the change; callers must check
* that {@link #error()} is absent before attempting to look up the notes.
*/
public ChangeNotes notes() {
checkState(maybeNotes() != null, "no ChangeNotes loaded; check error().isPresent() first");
return maybeNotes();
}
@Nullable
abstract ChangeNotes maybeNotes();
}
@AutoValue
abstract static class ScanResult {
abstract ImmutableSet fromPatchSetRefs();
abstract ImmutableSet fromMetaRefs();
SetView all() {
return Sets.union(fromPatchSetRefs(), fromMetaRefs());
}
}
private static ScanResult scanChangeIds(Repository repo) throws IOException {
ImmutableSet.Builder fromPs = ImmutableSet.builder();
ImmutableSet.Builder fromMeta = ImmutableSet.builder();
for (Ref r : repo.getRefDatabase().getRefsByPrefix(RefNames.REFS_CHANGES)) {
Change.Id id = Change.Id.fromRef(r.getName());
if (id != null) {
(r.getName().endsWith(RefNames.META_SUFFIX) ? fromMeta : fromPs).add(id);
}
}
return new AutoValue_ChangeNotes_Factory_ScanResult(fromPs.build(), fromMeta.build());
}
}
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 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, boolean shouldExist, @Nullable RefCache refs) {
super(args, change.getId());
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();
}
/** @return reviewers that do not currently have a Gerrit account and were added by email. */
public ReviewerByEmailSet getReviewersByEmail() {
return state.reviewersByEmail();
}
/** @return reviewers that were modified during this change's current WIP phase. */
public ReviewerSet getPendingReviewers() {
return state.pendingReviewers();
}
/** @return reviewers by email that were modified during this change's current WIP phase. */
public ReviewerByEmailSet getPendingReviewersByEmail() {
return state.pendingReviewersByEmail();
}
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.changeMessages();
}
/** @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) {
return getDraftComments(author, null);
}
public ImmutableListMultimap getDraftComments(
Account.Id author, @Nullable Ref ref) {
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() {
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) {
if (draftCommentNotes == null || !author.equals(draftCommentNotes.getAuthor()) || ref != null) {
draftCommentNotes = new DraftCommentNotes(args, getChangeId(), author, ref);
draftCommentNotes.load();
}
}
private void loadRobotComments() {
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) {
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 requireNonNull(
getPatchSets().get(psId), () -> String.format("missing current patch set %s", psId.get()));
}
@Override
protected void onLoad(LoadHandle handle) throws NoSuchChangeException, IOException {
ObjectId rev = handle.id();
if (rev == null) {
if (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);
}
}
