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/**
* Copyright (C) 2014 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/commands/group.h"
#include <boost/scoped_ptr.hpp>
#include "mongo/db/auth/action_set.h"
#include "mongo/db/auth/action_type.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/auth/privilege.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/client.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/exec/group.h"
#include "mongo/db/exec/working_set_common.h"
#include "mongo/db/query/get_executor.h"
namespace mongo {
using boost::scoped_ptr;
using std::string;
static GroupCommand cmdGroup;
GroupCommand::GroupCommand() : Command("group") {}
Status GroupCommand::checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
std::string ns = parseNs(dbname, cmdObj);
if (!AuthorizationSession::get(client)->isAuthorizedForActionsOnNamespace(
NamespaceString(ns), ActionType::find)) {
return Status(ErrorCodes::Unauthorized, "unauthorized");
}
return Status::OK();
}
std::string GroupCommand::parseNs(const std::string& dbname, const BSONObj& cmdObj) const {
const BSONObj& p = cmdObj.firstElement().embeddedObjectUserCheck();
uassert(17211, "ns has to be set", p["ns"].type() == String);
return dbname + "." + p["ns"].String();
}
Status GroupCommand::parseRequest(const string& dbname,
const BSONObj& cmdObj,
GroupRequest* request) const {
request->ns = parseNs(dbname, cmdObj);
// By default, group requests are regular group not explain of group.
request->explain = false;
const BSONObj& p = cmdObj.firstElement().embeddedObjectUserCheck();
if (p["cond"].type() == Object) {
request->query = p["cond"].embeddedObject().getOwned();
}
else if (p["condition"].type() == Object) {
request->query = p["condition"].embeddedObject().getOwned();
}
else if (p["query"].type() == Object) {
request->query = p["query"].embeddedObject().getOwned();
}
else if (p["q"].type() == Object) {
request->query = p["q"].embeddedObject().getOwned();
}
if (p["key"].type() == Object) {
request->keyPattern = p["key"].embeddedObjectUserCheck().getOwned();
if (!p["$keyf"].eoo()) {
return Status(ErrorCodes::BadValue, "can't have key and $keyf");
}
}
else if (!p["$keyf"].eoo()) {
request->keyFunctionCode = p["$keyf"]._asCode();
}
else {
// No key specified. Use the entire object as the key.
}
BSONElement reduce = p["$reduce"];
if (reduce.eoo()) {
return Status(ErrorCodes::BadValue, "$reduce has to be set");
}
request->reduceCode = reduce._asCode();
if (reduce.type() == CodeWScope) {
request->reduceScope = reduce.codeWScopeObject().getOwned();
}
if (p["initial"].type() != Object) {
return Status(ErrorCodes::BadValue, "initial has to be an object");
}
request->initial = p["initial"].embeddedObject().getOwned();
if (!p["finalize"].eoo()) {
request->finalize = p["finalize"]._asCode();
}
return Status::OK();
}
bool GroupCommand::run(OperationContext* txn,
const std::string& dbname,
BSONObj& cmdObj,
int,
std::string& errmsg,
BSONObjBuilder& out) {
GroupRequest groupRequest;
Status parseRequestStatus = parseRequest(dbname, cmdObj, &groupRequest);
if (!parseRequestStatus.isOK()) {
return appendCommandStatus(out, parseRequestStatus);
}
AutoGetCollectionForRead ctx(txn, groupRequest.ns);
Collection* coll = ctx.getCollection();
PlanExecutor *rawPlanExecutor;
Status getExecStatus = getExecutorGroup(txn,
coll,
groupRequest,
PlanExecutor::YIELD_AUTO,
&rawPlanExecutor);
if (!getExecStatus.isOK()) {
return appendCommandStatus(out, getExecStatus);
}
scoped_ptr<PlanExecutor> planExecutor(rawPlanExecutor);
// Group executors return ADVANCED exactly once, with the entire group result.
BSONObj retval;
PlanExecutor::ExecState state = planExecutor->getNext(&retval, NULL);
if (PlanExecutor::ADVANCED != state) {
invariant(PlanExecutor::FAILURE == state || PlanExecutor::DEAD == state);
if (WorkingSetCommon::isValidStatusMemberObject(retval)) {
return appendCommandStatus(out, WorkingSetCommon::getMemberObjectStatus(retval));
}
return appendCommandStatus(out,
Status(ErrorCodes::BadValue,
str::stream() << "error encountered during group "
<< "operation, executor returned "
<< PlanExecutor::statestr(state)));
}
invariant(planExecutor->isEOF());
invariant(STAGE_GROUP == planExecutor->getRootStage()->stageType());
GroupStage* groupStage = static_cast<GroupStage*>(planExecutor->getRootStage());
const GroupStats* groupStats =
static_cast<const GroupStats*>(groupStage->getSpecificStats());
const CommonStats* groupChildStats = groupStage->getChildren()[0]->getCommonStats();
out.appendArray("retval", retval);
out.append("count", static_cast<long long>(groupChildStats->advanced));
out.append("keys", static_cast<long long>(groupStats->nGroups));
return true;
}
Status GroupCommand::explain(OperationContext* txn,
const std::string& dbname,
const BSONObj& cmdObj,
ExplainCommon::Verbosity verbosity,
BSONObjBuilder* out) const {
GroupRequest groupRequest;
Status parseRequestStatus = parseRequest(dbname, cmdObj, &groupRequest);
if (!parseRequestStatus.isOK()) {
return parseRequestStatus;
}
groupRequest.explain = true;
AutoGetCollectionForRead ctx(txn, groupRequest.ns);
Collection* coll = ctx.getCollection();
PlanExecutor *rawPlanExecutor;
Status getExecStatus = getExecutorGroup(txn,
coll,
groupRequest,
PlanExecutor::YIELD_AUTO,
&rawPlanExecutor);
if (!getExecStatus.isOK()) {
return getExecStatus;
}
scoped_ptr<PlanExecutor> planExecutor(rawPlanExecutor);
Explain::explainStages(planExecutor.get(), verbosity, out);
return Status::OK();
}
} // namespace mongo
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