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/**
* Copyright (C) 2016 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 <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.
*/
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kSharding
#include "mongo/platform/basic.h"
#include <string>
#include <vector>
#include "mongo/bson/util/bson_extract.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/s/operation_sharding_state.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/s/split_chunk.h"
#include "mongo/s/stale_exception.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::string;
using std::unique_ptr;
using std::vector;
namespace {
class SplitChunkCommand : public ErrmsgCommandDeprecated {
public:
SplitChunkCommand() : ErrmsgCommandDeprecated("splitChunk") {}
std::string help() const override {
return "internal command usage only\n"
"example:\n"
" { splitChunk:\"db.foo\" , keyPattern: {a:1} , min : {a:100} , max: {a:200} { "
"splitKeys : [ {a:150} , ... ]}";
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
AllowedOnSecondary secondaryAllowed() const override {
return AllowedOnSecondary::kNever;
}
bool adminOnly() const override {
return true;
}
Status checkAuthForCommand(Client* client,
const std::string& dbname,
const BSONObj& cmdObj) override {
if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnResource(
ResourcePattern::forClusterResource(), ActionType::internal)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
std::string parseNs(const std::string& dbname, const BSONObj& cmdObj) const override {
return CommandHelpers::parseNsFullyQualified(dbname, cmdObj);
}
bool errmsgRun(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
std::string& errmsg,
BSONObjBuilder& result) override {
uassertStatusOK(ShardingState::get(opCtx)->canAcceptShardedCommands());
//
// Check whether parameters passed to splitChunk are sound
//
const NamespaceString nss = NamespaceString(parseNs(dbname, cmdObj));
if (!nss.isValid()) {
errmsg = str::stream() << "invalid namespace '" << nss.toString()
<< "' specified for command";
return false;
}
BSONObj keyPatternObj;
{
BSONElement keyPatternElem;
auto keyPatternStatus =
bsonExtractTypedField(cmdObj, "keyPattern", Object, &keyPatternElem);
if (!keyPatternStatus.isOK()) {
errmsg = "need to specify the key pattern the collection is sharded over";
return false;
}
keyPatternObj = keyPatternElem.Obj();
}
auto chunkRange = uassertStatusOK(ChunkRange::fromBSON(cmdObj));
string shardName;
auto parseShardNameStatus = bsonExtractStringField(cmdObj, "from", &shardName);
if (!parseShardNameStatus.isOK())
return CommandHelpers::appendCommandStatus(result, parseShardNameStatus);
log() << "received splitChunk request: " << redact(cmdObj);
vector<BSONObj> splitKeys;
{
BSONElement splitKeysElem;
auto splitKeysElemStatus =
bsonExtractTypedField(cmdObj, "splitKeys", mongo::Array, &splitKeysElem);
if (!splitKeysElemStatus.isOK()) {
errmsg = "need to provide the split points to chunk over";
return false;
}
BSONObjIterator it(splitKeysElem.Obj());
while (it.more()) {
splitKeys.push_back(it.next().Obj().getOwned());
}
}
OID expectedCollectionEpoch;
if (cmdObj.hasField("epoch")) {
auto epochStatus = bsonExtractOIDField(cmdObj, "epoch", &expectedCollectionEpoch);
uassert(
ErrorCodes::InvalidOptions, "unable to parse collection epoch", epochStatus.isOK());
} else {
// Backwards compatibility with v3.4 mongos, which will send 'shardVersion' and not
// 'epoch'.
const auto& oss = OperationShardingState::get(opCtx);
uassert(
ErrorCodes::InvalidOptions, "collection version is missing", oss.hasShardVersion());
expectedCollectionEpoch = oss.getShardVersion(nss).epoch();
}
auto statusWithOptionalChunkRange = splitChunk(
opCtx, nss, keyPatternObj, chunkRange, splitKeys, shardName, expectedCollectionEpoch);
// If the split chunk returns something that is not Status::Ok(), then something failed.
uassertStatusOK(statusWithOptionalChunkRange.getStatus());
// Otherwise, we want to check whether or not top-chunk optimization should be performed.
// If yes, then we should have a ChunkRange that was returned. Regardless of whether it
// should be performed, we will return true.
if (auto topChunk = statusWithOptionalChunkRange.getValue()) {
result.append("shouldMigrate",
BSON("min" << topChunk->getMin() << "max" << topChunk->getMax()));
}
return true;
}
} cmdSplitChunk;
} // namespace
} // namespace mongo
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