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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 <algorithm>
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/s/split_vector.h"
namespace mongo {
using std::string;
using std::stringstream;
namespace {
class SplitVector : public ErrmsgCommandDeprecated {
public:
SplitVector() : ErrmsgCommandDeprecated("splitVector") {}
bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
std::string help() const override {
return "Internal command.\n"
"examples:\n"
" { splitVector : \"blog.post\" , keyPattern:{x:1} , min:{x:10} , max:{x:20}, "
"maxChunkSize:200 }\n"
" maxChunkSize unit in MBs\n"
" May optionally specify 'maxSplitPoints' and 'maxChunkObjects' to avoid "
"traversing the whole chunk\n"
" \n"
" { splitVector : \"blog.post\" , keyPattern:{x:1} , min:{x:10} , max:{x:20}, "
"force: true }\n"
" 'force' will produce one split point even if data is small; defaults to false\n"
"NOTE: This command may take a while to run";
}
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::splitVector)) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
return Status::OK();
}
std::string parseNs(const string& dbname, const BSONObj& cmdObj) const override {
return CommandHelpers::CommandHelpers::parseNsFullyQualified(cmdObj);
}
bool errmsgRun(OperationContext* opCtx,
const string& dbname,
const BSONObj& jsobj,
string& errmsg,
BSONObjBuilder& result) override {
const NamespaceString nss = NamespaceString(parseNs(dbname, jsobj));
BSONObj keyPattern = jsobj.getObjectField("keyPattern");
if (keyPattern.isEmpty()) {
errmsg = "no key pattern found in splitVector";
return false;
}
BSONObj min = jsobj.getObjectField("min");
BSONObj max = jsobj.getObjectField("max");
if (min.isEmpty() != max.isEmpty()) {
errmsg = "either provide both min and max or leave both empty";
return false;
}
bool force = false;
BSONElement forceElem = jsobj["force"];
if (forceElem.trueValue()) {
force = true;
}
boost::optional<long long> maxSplitPoints;
BSONElement maxSplitPointsElem = jsobj["maxSplitPoints"];
if (maxSplitPointsElem.isNumber()) {
maxSplitPoints = maxSplitPointsElem.safeNumberLong();
}
boost::optional<long long> maxChunkObjects;
BSONElement maxChunkObjectsElem = jsobj["maxChunkObjects"];
if (maxChunkObjectsElem.isNumber()) {
maxChunkObjects = maxChunkObjectsElem.safeNumberLong();
uassert(ErrorCodes::InvalidOptions,
"maxChunkObjects must be greater than 0",
*maxChunkObjects > 0);
}
const auto maxChunkSizeBytes = [&]() {
BSONElement maxSizeElem = jsobj["maxChunkSize"];
BSONElement maxSizeBytesElem = jsobj["maxChunkSizeBytes"];
boost::optional<long long> ret = boost::none;
// Use maxChunkSize if present otherwise maxChunkSizeBytes
if (maxSizeElem.isNumber()) {
long long maxChunkSizeMB = maxSizeElem.safeNumberLong();
// Prevent maxChunkSizeBytes overflow. Check aimed to avoid fuzzer failures
// since users are definitely not expected to specify maxChunkSize in exabytes.
uassert(ErrorCodes::InvalidOptions,
str::stream() << "maxChunkSize must lie within the range [1MB, 1024MB]",
maxChunkSizeMB >= 1 && maxChunkSizeMB <= 1024);
ret = maxChunkSizeMB << 20;
} else if (maxSizeBytesElem.isNumber()) {
ret = maxSizeBytesElem.safeNumberLong();
uassert(ErrorCodes::InvalidOptions,
"The specified max chunk size must lie within the range [1MB, 1024MB]",
*ret >= 1024 * 1024 && *ret <= 1024 * 1024 * 1024);
}
return ret;
}();
auto splitKeys = splitVector(opCtx,
nss,
keyPattern,
min,
max,
force,
maxSplitPoints,
maxChunkObjects,
maxChunkSizeBytes);
result.append("splitKeys", splitKeys);
return true;
}
} cmdSplitVector;
} // namespace
} // namespace mongo
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