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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/find_cmd.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/query/explain.h"
#include "mongo/db/query/get_executor.h"
#include "mongo/db/query/new_find.h"
#include "mongo/s/d_state.h"
namespace mongo {
static FindCmd findCmd;
Status FindCmd::checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
AuthorizationSession* authzSession = client->getAuthorizationSession();
ResourcePattern pattern = parseResourcePattern(dbname, cmdObj);
if (authzSession->isAuthorizedForActionsOnResource(pattern, ActionType::find)) {
return Status::OK();
}
return Status(ErrorCodes::Unauthorized, "unauthorized");
}
Status FindCmd::explain(OperationContext* txn,
const std::string& dbname,
const BSONObj& cmdObj,
ExplainCommon::Verbosity verbosity,
BSONObjBuilder* out) const {
const string fullns = parseNs(dbname, cmdObj);
// Parse the command BSON to a LiteParsedQuery.
LiteParsedQuery* rawLpq;
bool isExplain = true;
Status lpqStatus = LiteParsedQuery::make(fullns, cmdObj, isExplain, &rawLpq);
if (!lpqStatus.isOK()) {
return lpqStatus;
}
auto_ptr<LiteParsedQuery> lpq(rawLpq);
const NamespaceString nss(fullns);
// Finish the parsing step by using the LiteParsedQuery to create a CanonicalQuery.
// This requires a lock on the collection in case we're parsing $where: where-specific
// parsing code assumes we have a lock and creates execution machinery that requires it.
CanonicalQuery* rawCq;
WhereCallbackReal whereCallback(txn, nss.db());
Status canonStatus = CanonicalQuery::canonicalize(lpq.release(), &rawCq, whereCallback);
if (!canonStatus.isOK()) {
return canonStatus;
}
auto_ptr<CanonicalQuery> cq(rawCq);
AutoGetCollectionForRead ctx(txn, nss);
// The collection may be NULL. If so, getExecutor() should handle it by returning
// an execution tree with an EOFStage.
Collection* collection = ctx.getCollection();
// We have a parsed query. Time to get the execution plan for it.
PlanExecutor* rawExec;
Status execStatus = Status::OK();
if (cq->getParsed().getOptions().oplogReplay) {
execStatus = getOplogStartHack(txn, collection, cq.release(), &rawExec);
}
else {
size_t options = QueryPlannerParams::DEFAULT;
if (shardingState.needCollectionMetadata(cq->getParsed().ns())) {
options |= QueryPlannerParams::INCLUDE_SHARD_FILTER;
}
execStatus = getExecutor(txn, collection, cq.release(), &rawExec, options);
}
if (!execStatus.isOK()) {
return execStatus;
}
scoped_ptr<PlanExecutor> exec(rawExec);
const ScopedExecutorRegistration safety(exec.get());
// Got the execution tree. Explain it.
return Explain::explainStages(txn, exec.get(), verbosity, out);
}
bool FindCmd::run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj, int options,
string& errmsg,
BSONObjBuilder& result,
bool fromRepl) {
// Currently only explains of finds run through the find command. Queries that are not
// explained use the legacy OP_QUERY path.
errmsg = "find command not yet implemented";
return false;
}
} // namespace mongo
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