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/**
* Copyright (C) 2013 10gen 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 <http://www.gnu.org/licenses/>.
*
* 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/base/init.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/d_state.h"
#include "mongo/s/d_merge.h"
namespace mongo {
using std::string;
using std::stringstream;
using std::vector;
/**
* Mongod-side command for merging chunks.
*/
class MergeChunksCommand : public Command {
public:
MergeChunksCommand() : Command("mergeChunks") {}
virtual void help(stringstream& h) const {
h << "Merge Chunks command\n"
<< "usage: { mergeChunks : <ns>, bounds : [ <min key>, <max key> ],"
<< " (opt) epoch : <epoch>, (opt) config : <configdb string>,"
<< " (opt) shardName : <shard name> }";
}
virtual Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
ResourcePattern::forExactNamespace(NamespaceString(parseNs(dbname, cmdObj))),
ActionType::splitChunk)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
virtual std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const {
return parseNsFullyQualified(dbname, cmdObj);
}
virtual bool adminOnly() const {
return true;
}
virtual bool slaveOk() const {
return false;
}
virtual bool isWriteCommandForConfigServer() const {
return false;
}
// Required
static BSONField<string> nsField;
static BSONField<vector<BSONObj>> boundsField;
// Optional, if the merge is only valid for a particular epoch
static BSONField<OID> epochField;
// Optional, if our sharding state has not previously been initializeed
static BSONField<string> shardNameField;
static BSONField<string> configField;
bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result) {
string ns = parseNs(dbname, cmdObj);
if (ns.size() == 0) {
errmsg = "no namespace specified";
return false;
}
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;
}
//
// This might be the first call from mongos, so we may need to pass the config and shard
// information to initialize the shardingState.
//
string config;
FieldParser::FieldState extracted =
FieldParser::extract(cmdObj, configField, &config, &errmsg);
if (!shardingState.enabled()) {
if (!extracted || extracted == FieldParser::FIELD_NONE) {
errmsg =
"sharding state must be enabled or "
"config server specified to merge chunks";
return false;
}
ShardingState::initialize(config);
}
// ShardName is optional, but might not be set yet
string shardName;
extracted = FieldParser::extract(cmdObj, shardNameField, &shardName, &errmsg);
if (!extracted)
return false;
if (extracted != FieldParser::FIELD_NONE) {
shardingState.gotShardName(shardName);
}
//
// Epoch is optional, and if not set indicates we should use the latest epoch
//
OID epoch;
if (!FieldParser::extract(cmdObj, epochField, &epoch, &errmsg)) {
return false;
}
return mergeChunks(txn, NamespaceString(ns), minKey, maxKey, epoch, &errmsg);
}
};
BSONField<string> MergeChunksCommand::nsField("mergeChunks");
BSONField<vector<BSONObj>> MergeChunksCommand::boundsField("bounds");
BSONField<string> MergeChunksCommand::configField("config");
BSONField<string> MergeChunksCommand::shardNameField("shardName");
BSONField<OID> MergeChunksCommand::epochField("epoch");
MONGO_INITIALIZER(InitMergeChunksCommand)(InitializerContext* context) {
// Leaked intentionally: a Command registers itself when constructed.
new MergeChunksCommand();
return Status::OK();
}
}
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