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// Copyright (C) 2015 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.checkState;
import com.google.gerrit.extensions.registration.DynamicItem;
import com.google.gerrit.extensions.restapi.MethodNotAllowedException;
import com.google.gerrit.extensions.restapi.ResourceConflictException;
import com.google.gerrit.extensions.restapi.RestApiException;
import com.google.gerrit.reviewdb.client.Change;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.server.ReviewDb;
import com.google.gerrit.reviewdb.server.ReviewDbUtil;
import com.google.gerrit.server.PatchSetUtil;
import com.google.gerrit.server.StarredChangesUtil;
import com.google.gerrit.server.extensions.events.ChangeDeleted;
import com.google.gerrit.server.project.NoSuchChangeException;
import com.google.gerrit.server.update.BatchUpdateOp;
import com.google.gerrit.server.update.BatchUpdateReviewDb;
import com.google.gerrit.server.update.ChangeContext;
import com.google.gerrit.server.update.Order;
import com.google.gerrit.server.update.RepoContext;
import com.google.gwtorm.server.OrmException;
import com.google.inject.Inject;
import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.Optional;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.revwalk.RevWalk;
class DeleteChangeOp implements BatchUpdateOp {
static ReviewDb unwrap(ReviewDb db) {
// This is special. We want to delete exactly the rows that are present in
// the database, even when reading everything else from NoteDb, so we need
// to bypass the write-only wrapper.
if (db instanceof BatchUpdateReviewDb) {
db = ((BatchUpdateReviewDb) db).unsafeGetDelegate();
}
return ReviewDbUtil.unwrapDb(db);
}
private final PatchSetUtil psUtil;
private final StarredChangesUtil starredChangesUtil;
private final DynamicItem<AccountPatchReviewStore> accountPatchReviewStore;
private final ChangeDeleted changeDeleted;
private Change.Id id;
@Inject
DeleteChangeOp(
PatchSetUtil psUtil,
StarredChangesUtil starredChangesUtil,
DynamicItem<AccountPatchReviewStore> accountPatchReviewStore,
ChangeDeleted changeDeleted) {
this.psUtil = psUtil;
this.starredChangesUtil = starredChangesUtil;
this.accountPatchReviewStore = accountPatchReviewStore;
this.changeDeleted = changeDeleted;
}
@Override
public boolean updateChange(ChangeContext ctx)
throws RestApiException, OrmException, IOException, NoSuchChangeException {
checkState(
ctx.getOrder() == Order.DB_BEFORE_REPO, "must use DeleteChangeOp with DB_BEFORE_REPO");
checkState(id == null, "cannot reuse DeleteChangeOp");
id = ctx.getChange().getId();
Collection<PatchSet> patchSets = psUtil.byChange(ctx.getDb(), ctx.getNotes());
ensureDeletable(ctx, id, patchSets);
// Cleaning up is only possible as long as the change and its elements are
// still part of the database.
cleanUpReferences(ctx, id, patchSets);
deleteChangeElementsFromDb(ctx, id);
ctx.deleteChange();
changeDeleted.fire(ctx.getChange(), ctx.getAccount(), ctx.getWhen());
return true;
}
private void ensureDeletable(ChangeContext ctx, Change.Id id, Collection<PatchSet> patchSets)
throws ResourceConflictException, MethodNotAllowedException, IOException {
Change.Status status = ctx.getChange().getStatus();
if (status == Change.Status.MERGED) {
throw new MethodNotAllowedException("Deleting merged change " + id + " is not allowed");
}
for (PatchSet patchSet : patchSets) {
if (isPatchSetMerged(ctx, patchSet)) {
throw new ResourceConflictException(
String.format(
"Cannot delete change %s: patch set %s is already merged",
id, patchSet.getPatchSetId()));
}
}
}
private boolean isPatchSetMerged(ChangeContext ctx, PatchSet patchSet) throws IOException {
Optional<ObjectId> destId = ctx.getRepoView().getRef(ctx.getChange().getDest().get());
if (!destId.isPresent()) {
return false;
}
RevWalk revWalk = ctx.getRevWalk();
ObjectId objectId = ObjectId.fromString(patchSet.getRevision().get());
return revWalk.isMergedInto(revWalk.parseCommit(objectId), revWalk.parseCommit(destId.get()));
}
private void deleteChangeElementsFromDb(ChangeContext ctx, Change.Id id) throws OrmException {
// Only delete from ReviewDb here; deletion from NoteDb is handled in
// BatchUpdate.
ReviewDb db = unwrap(ctx.getDb());
db.patchComments().delete(db.patchComments().byChange(id));
db.patchSetApprovals().delete(db.patchSetApprovals().byChange(id));
db.patchSets().delete(db.patchSets().byChange(id));
db.changeMessages().delete(db.changeMessages().byChange(id));
}
private void cleanUpReferences(ChangeContext ctx, Change.Id id, Collection<PatchSet> patchSets)
throws OrmException, NoSuchChangeException {
for (PatchSet ps : patchSets) {
accountPatchReviewStore.get().clearReviewed(ps.getId());
}
// Non-atomic operation on Accounts table; not much we can do to make it
// atomic.
starredChangesUtil.unstarAll(ctx.getChange().getProject(), id);
}
@Override
public void updateRepo(RepoContext ctx) throws IOException {
String prefix = new PatchSet.Id(id, 1).toRefName();
prefix = prefix.substring(0, prefix.length() - 1);
for (Map.Entry<String, ObjectId> e : ctx.getRepoView().getRefs(prefix).entrySet()) {
ctx.addRefUpdate(e.getValue(), ObjectId.zeroId(), prefix + e.getKey());
}
}
}
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