/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
*
* 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 GNU Affero General 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_connection.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/s/commands/cluster_commands_helpers.h"
#include "mongo/s/grid.h"
namespace mongo {
using std::shared_ptr;
using std::string;
using std::stringstream;
using std::vector;
namespace {
/**
* Mongos-side command for merging chunks, passes command to appropriate shard.
*/
class ClusterMergeChunksCommand : public BasicCommand {
public:
ClusterMergeChunksCommand() : BasicCommand("mergeChunks") {}
void help(stringstream& h) const override {
h << "Merge Chunks command\n"
<< "usage: { mergeChunks : , bounds : [ , ] }";
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) 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 parseNsFullyQualified(dbname, cmdObj);
}
bool adminOnly() const override {
return true;
}
bool slaveOk() const override {
return false;
}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
// Required
static BSONField nsField;
static BSONField> boundsField;
// Used to send sharding state
static BSONField shardNameField;
static BSONField configField;
bool run(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
string& errmsg,
BSONObjBuilder& result) override {
const NamespaceString nss(parseNs(dbname, cmdObj));
auto routingInfo = uassertStatusOK(
Grid::get(opCtx)->catalogCache()->getShardedCollectionRoutingInfoWithRefresh(opCtx,
nss));
const auto cm = routingInfo.cm();
vector 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;
}
if (!cm->getShardKeyPattern().isShardKey(minKey) ||
!cm->getShardKeyPattern().isShardKey(maxKey)) {
errmsg = 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);
shared_ptr firstChunk = cm->findIntersectingChunkWithSimpleCollation(minKey);
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());
BSONObj remoteResult;
// Throws, but handled at level above. Don't want to rewrap to preserve exception
// formatting.
const auto shardStatus =
Grid::get(opCtx)->shardRegistry()->getShard(opCtx, firstChunk->getShardId());
if (!shardStatus.isOK()) {
return appendCommandStatus(
result,
Status(ErrorCodes::ShardNotFound,
str::stream() << "Can't find shard for chunk: " << firstChunk->toString()));
}
ShardConnection conn(shardStatus.getValue()->getConnString(), "");
bool ok = conn->runCommand("admin", remoteCmdObjB.obj(), remoteResult);
conn.done();
Grid::get(opCtx)->catalogCache()->onStaleConfigError(std::move(routingInfo));
filterCommandReplyForPassthrough(remoteResult, &result);
return ok;
}
} clusterMergeChunksCommand;
BSONField ClusterMergeChunksCommand::nsField("mergeChunks");
BSONField> ClusterMergeChunksCommand::boundsField("bounds");
BSONField ClusterMergeChunksCommand::configField("config");
BSONField ClusterMergeChunksCommand::shardNameField("shardName");
} // namespace
} // namespace mongo