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// Copyright (C) 2014 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.config;
import static com.google.gerrit.common.data.GlobalCapability.FLUSH_CACHES;
import static com.google.gerrit.common.data.GlobalCapability.MAINTAIN_SERVER;
import com.google.common.cache.Cache;
import com.google.gerrit.extensions.annotations.RequiresAnyCapability;
import com.google.gerrit.extensions.registration.DynamicMap;
import com.google.gerrit.extensions.restapi.AuthException;
import com.google.gerrit.extensions.restapi.BadRequestException;
import com.google.gerrit.extensions.restapi.Response;
import com.google.gerrit.extensions.restapi.RestModifyView;
import com.google.gerrit.extensions.restapi.UnprocessableEntityException;
import com.google.gerrit.server.config.PostCaches.Input;
import com.google.gerrit.server.permissions.PermissionBackendException;
import com.google.inject.Inject;
import com.google.inject.Singleton;
import java.util.ArrayList;
import java.util.List;
@RequiresAnyCapability({FLUSH_CACHES, MAINTAIN_SERVER})
@Singleton
public class PostCaches implements RestModifyView<ConfigResource, Input> {
public static class Input {
public Operation operation;
public List<String> caches;
public Input() {}
public Input(Operation op) {
this(op, null);
}
public Input(Operation op, List<String> c) {
operation = op;
caches = c;
}
}
public enum Operation {
FLUSH_ALL,
FLUSH
}
private final DynamicMap<Cache<?, ?>> cacheMap;
private final FlushCache flushCache;
@Inject
public PostCaches(DynamicMap<Cache<?, ?>> cacheMap, FlushCache flushCache) {
this.cacheMap = cacheMap;
this.flushCache = flushCache;
}
@Override
public Response<String> apply(ConfigResource rsrc, Input input)
throws AuthException, BadRequestException, UnprocessableEntityException,
PermissionBackendException {
if (input == null || input.operation == null) {
throw new BadRequestException("operation must be specified");
}
switch (input.operation) {
case FLUSH_ALL:
if (input.caches != null) {
throw new BadRequestException(
"specifying caches is not allowed for operation 'FLUSH_ALL'");
}
flushAll();
return Response.ok("");
case FLUSH:
if (input.caches == null || input.caches.isEmpty()) {
throw new BadRequestException("caches must be specified for operation 'FLUSH'");
}
flush(input.caches);
return Response.ok("");
default:
throw new BadRequestException("unsupported operation: " + input.operation);
}
}
private void flushAll() throws AuthException, PermissionBackendException {
for (DynamicMap.Entry<Cache<?, ?>> e : cacheMap) {
CacheResource cacheResource =
new CacheResource(e.getPluginName(), e.getExportName(), e.getProvider());
if (FlushCache.WEB_SESSIONS.equals(cacheResource.getName())) {
continue;
}
flushCache.apply(cacheResource, null);
}
}
private void flush(List<String> cacheNames)
throws UnprocessableEntityException, AuthException, PermissionBackendException {
List<CacheResource> cacheResources = new ArrayList<>(cacheNames.size());
for (String n : cacheNames) {
String pluginName = "gerrit";
String cacheName = n;
int i = cacheName.lastIndexOf('-');
if (i != -1) {
pluginName = cacheName.substring(0, i);
cacheName = cacheName.length() > i + 1 ? cacheName.substring(i + 1) : "";
}
Cache<?, ?> cache = cacheMap.get(pluginName, cacheName);
if (cache != null) {
cacheResources.add(new CacheResource(pluginName, cacheName, cache));
} else {
throw new UnprocessableEntityException(String.format("cache %s not found", n));
}
}
for (CacheResource rsrc : cacheResources) {
flushCache.apply(rsrc, null);
}
}
}
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