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// Copyright (C) 2019 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;
import com.google.common.base.Predicate;
import com.google.common.base.Throwables;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.common.Nullable;
import com.google.gerrit.exceptions.MergeUpdateException;
import com.google.gerrit.git.LockFailureException;
import com.google.gerrit.server.project.ProjectConfig;
import java.util.Optional;
import org.eclipse.jgit.errors.MissingObjectException;
import org.eclipse.jgit.lib.RefUpdate;
/**
* Class to detect and handle exceptions that are caused by temporary errors, and hence should cause
* a retry of the failed operation.
*/
public class ExceptionHookImpl implements ExceptionHook {
private static final String LOCK_FAILURE_USER_MESSAGE =
"Updating a ref failed with LOCK_FAILURE.\n"
+ "This may be a temporary issue due to concurrent updates.\n"
+ "Please retry later.";
private static final String INVALID_PROJECT_CONFIG_USER_MESSAGE =
"Invalid " + ProjectConfig.PROJECT_CONFIG + " file.";
private static final String CONTACT_PROJECT_OWNER_USER_MESSAGE =
"Please contact the project owner.";
@Override
public boolean shouldRetry(String actionType, String actionName, Throwable throwable) {
return isLockFailure(throwable);
}
@Override
public boolean skipRetryWithTrace(String actionType, String actionName, Throwable throwable) {
return isInvalidProjectConfig(throwable);
}
@Override
public Optional<String> formatCause(Throwable throwable) {
if (isLockFailure(throwable)) {
return Optional.of(RefUpdate.Result.LOCK_FAILURE.name());
}
if (isMissingObjectException(throwable)) {
return Optional.of("missing_object");
}
if (isInvalidProjectConfig(throwable)) {
return Optional.of("invalid_project_config");
}
return Optional.empty();
}
@Override
public ImmutableList<String> getUserMessages(Throwable throwable, @Nullable String traceId) {
if (isLockFailure(throwable)) {
return ImmutableList.of(LOCK_FAILURE_USER_MESSAGE);
}
if (isInvalidProjectConfig(throwable)) {
return ImmutableList.of(
getInvalidConfigMessage(throwable).orElse(INVALID_PROJECT_CONFIG_USER_MESSAGE)
+ "\n"
+ CONTACT_PROJECT_OWNER_USER_MESSAGE);
}
if (throwable instanceof MergeUpdateException) {
return ImmutableList.of(throwable.getMessage());
}
return ImmutableList.of();
}
@Override
public Optional<Status> getStatus(Throwable throwable) {
if (isLockFailure(throwable)) {
return Optional.of(Status.create(503, "Lock failure"));
}
if (isInvalidProjectConfig(throwable)) {
return Optional.of(Status.create(409, "Conflict"));
}
return Optional.empty();
}
private static boolean isLockFailure(Throwable throwable) {
return isMatching(throwable, t -> t instanceof LockFailureException);
}
private static boolean isMissingObjectException(Throwable throwable) {
return isMatching(throwable, t -> t instanceof MissingObjectException);
}
private static boolean isInvalidProjectConfig(Throwable throwable) {
return isMatching(
throwable,
t ->
t instanceof InvalidConfigFileException
&& ProjectConfig.PROJECT_CONFIG.equals(
((InvalidConfigFileException) t).getFileName()));
}
private Optional<String> getInvalidConfigMessage(Throwable throwable) {
return Throwables.getCausalChain(throwable).stream()
.filter(InvalidConfigFileException.class::isInstance)
.map(ex -> ex.getMessage())
.findFirst();
}
/**
* Check whether the given exception or any of its causes matches the given predicate.
*
* @param throwable Exception that should be tested
* @param predicate predicate to check if a throwable matches
* @return {@code true} if the given exception or any of its causes matches the given predicate
*/
private static boolean isMatching(Throwable throwable, Predicate<Throwable> predicate) {
return Throwables.getCausalChain(throwable).stream().anyMatch(predicate);
}
}