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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/client/connpool.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/commands.h"
#include "mongo/db/field_parser.h"
#include "mongo/db/namespace_string.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/catalog_cache.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/grid.h"
namespace mongo {
using std::string;
using std::vector;
namespace {
/**
* Mongos-side command for merging chunks, passes command to appropriate shard.
*/
class ClusterMergeChunksCommand : public ErrmsgCommandDeprecated {
public:
ClusterMergeChunksCommand() : ErrmsgCommandDeprecated("mergeChunks") {}
std::string help() const override {
return "Merge Chunks command\n"
"usage: { mergeChunks : <ns>, bounds : [ <min key>, <max key> ] }";
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) const override {
if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
ResourcePattern::forExactNamespace(NamespaceString(parseNs(dbname, cmdObj))),
ActionType::splitChunk)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const override {
return CommandHelpers::parseNsFullyQualified(cmdObj);
}
bool adminOnly() const override {
return true;
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
// Required
static BSONField<string> nsField;
static BSONField<vector<BSONObj>> boundsField;
// Used to send sharding state
static BSONField<string> shardNameField;
static BSONField<string> configField;
bool errmsgRun(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) override {
const NamespaceString nss(parseNs(dbname, cmdObj));
vector<BSONObj> bounds;
if (!FieldParser::extract(cmdObj, boundsField, &bounds, &errmsg)) {
return false;
}
if (bounds.size() == 0) {
errmsg = "no bounds were specified";
return false;
}
if (bounds.size() != 2) {
errmsg = "only a min and max bound may be specified";
return false;
}
BSONObj minKey = bounds[0];
BSONObj maxKey = bounds[1];
if (minKey.isEmpty()) {
errmsg = "no min key specified";
return false;
}
if (maxKey.isEmpty()) {
errmsg = "no max key specified";
return false;
}
auto const cm =
Grid::get(opCtx)->catalogCache()->getShardedCollectionRoutingInfo(opCtx, nss);
if (!cm.getShardKeyPattern().isShardKey(minKey) ||
!cm.getShardKeyPattern().isShardKey(maxKey)) {
errmsg = str::stream()
<< "shard key bounds "
<< "[" << minKey << "," << maxKey << ")"
<< " are not valid for shard key pattern " << cm.getShardKeyPattern().toBSON();
return false;
}
minKey = cm.getShardKeyPattern().normalizeShardKey(minKey);
maxKey = cm.getShardKeyPattern().normalizeShardKey(maxKey);
const auto firstChunk = cm.findIntersectingChunkWithSimpleCollation(minKey);
ChunkVersion shardVersion = cm.getVersion(firstChunk.getShardId());
BSONObjBuilder remoteCmdObjB;
remoteCmdObjB.append(cmdObj[ClusterMergeChunksCommand::nsField()]);
remoteCmdObjB.append(cmdObj[ClusterMergeChunksCommand::boundsField()]);
remoteCmdObjB.append(
ClusterMergeChunksCommand::configField(),
Grid::get(opCtx)->shardRegistry()->getConfigServerConnectionString().toString());
remoteCmdObjB.append(ClusterMergeChunksCommand::shardNameField(),
firstChunk.getShardId().toString());
remoteCmdObjB.append("epoch", shardVersion.epoch());
shardVersion.serializeToBSON(ChunkVersion::kShardVersionField, &remoteCmdObjB);
BSONObj remoteResult;
// Throws, but handled at level above. Don't want to rewrap to preserve exception
// formatting.
auto shard = uassertStatusOK(
Grid::get(opCtx)->shardRegistry()->getShard(opCtx, firstChunk.getShardId()));
auto response = uassertStatusOK(shard->runCommandWithFixedRetryAttempts(
opCtx,
ReadPreferenceSetting{ReadPreference::PrimaryOnly},
"admin",
remoteCmdObjB.obj(),
Shard::RetryPolicy::kNotIdempotent));
uassertStatusOK(response.commandStatus);
Grid::get(opCtx)
->catalogCache()
->invalidateShardOrEntireCollectionEntryForShardedCollection(
nss, boost::none, firstChunk.getShardId());
CommandHelpers::filterCommandReplyForPassthrough(response.response, &result);
return true;
}
} clusterMergeChunksCommand;
BSONField<string> ClusterMergeChunksCommand::nsField("mergeChunks");
BSONField<vector<BSONObj>> ClusterMergeChunksCommand::boundsField("bounds");
BSONField<string> ClusterMergeChunksCommand::configField("config");
BSONField<string> ClusterMergeChunksCommand::shardNameField("shardName");
} // namespace
} // namespace mongo
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