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// list_indexes.cpp
/**
* Copyright (C) 2014 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/platform/basic.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog_entry.h"
#include "mongo/db/catalog/cursor_manager.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/clientcursor.h"
#include "mongo/db/commands.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/curop.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/exec/queued_data_stage.h"
#include "mongo/db/exec/working_set.h"
#include "mongo/db/query/cursor_responses.h"
#include "mongo/db/query/find_constants.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_engine.h"
namespace mongo {
using std::string;
using std::stringstream;
using std::vector;
/**
* Lists the indexes for a given collection.
*
* Format:
* {
* listIndexes: <collection name>
* }
*
* Return format:
* {
* indexes: [
* ...
* ]
* }
*/
class CmdListIndexes : public Command {
public:
virtual bool slaveOk() const { return false; }
virtual bool slaveOverrideOk() const { return true; }
virtual bool adminOnly() const { return false; }
virtual bool isWriteCommandForConfigServer() const { return false; }
virtual void help( stringstream& help ) const { help << "list indexes for a collection"; }
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::listIndexes);
out->push_back(Privilege(parseResourcePattern( dbname, cmdObj ), actions));
}
CmdListIndexes() : Command( "listIndexes" ) {}
bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result) {
BSONElement first = cmdObj.firstElement();
uassert(
28528,
str::stream() << "Argument to listIndexes must be of type String, not "
<< typeName(first.type()),
first.type() == String);
StringData collectionName = first.valueStringData();
uassert(
28529,
str::stream() << "Argument to listIndexes must be a collection name, "
<< "not the empty string",
!collectionName.empty());
const NamespaceString ns(dbname, collectionName);
const long long defaultBatchSize = std::numeric_limits<long long>::max();
long long batchSize;
Status parseCursorStatus = parseCommandCursorOptions(cmdObj,
defaultBatchSize,
&batchSize);
if (!parseCursorStatus.isOK()) {
return appendCommandStatus(result, parseCursorStatus);
}
AutoGetCollectionForRead autoColl(txn, ns);
if (!autoColl.getDb()) {
return appendCommandStatus( result, Status( ErrorCodes::NamespaceNotFound,
"no database" ) );
}
const Collection* collection = autoColl.getCollection();
if (!collection) {
return appendCommandStatus( result, Status( ErrorCodes::NamespaceNotFound,
"no collection" ) );
}
const CollectionCatalogEntry* cce = collection->getCatalogEntry();
invariant(cce);
vector<string> indexNames;
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
indexNames.clear();
cce->getAllIndexes( txn, &indexNames );
} MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "listIndexes", ns.ns());
std::unique_ptr<WorkingSet> ws(new WorkingSet());
std::unique_ptr<QueuedDataStage> root(new QueuedDataStage(ws.get()));
for ( size_t i = 0; i < indexNames.size(); i++ ) {
BSONObj indexSpec;
MONGO_WRITE_CONFLICT_RETRY_LOOP_BEGIN {
indexSpec = cce->getIndexSpec( txn, indexNames[i] );
} MONGO_WRITE_CONFLICT_RETRY_LOOP_END(txn, "listIndexes", ns.ns());
WorkingSetMember member;
member.state = WorkingSetMember::OWNED_OBJ;
member.keyData.clear();
member.loc = RecordId();
member.obj = Snapshotted<BSONObj>(SnapshotId(), indexSpec.getOwned());
root->pushBack(member);
}
std::string cursorNamespace = str::stream() << dbname << ".$cmd." << name << "."
<< ns.coll();
dassert(NamespaceString(cursorNamespace).isValid());
dassert(NamespaceString(cursorNamespace).isListIndexesGetMore());
dassert(ns == NamespaceString(cursorNamespace).getTargetNSForListIndexesGetMore());
PlanExecutor* rawExec;
Status makeStatus = PlanExecutor::make(txn,
ws.release(),
root.release(),
cursorNamespace,
PlanExecutor::YIELD_MANUAL,
&rawExec);
std::unique_ptr<PlanExecutor> exec(rawExec);
if (!makeStatus.isOK()) {
return appendCommandStatus( result, makeStatus );
}
BSONArrayBuilder firstBatch;
const int byteLimit = MaxBytesToReturnToClientAtOnce;
for (long long objCount = 0;
objCount < batchSize && firstBatch.len() < byteLimit;
objCount++) {
BSONObj next;
PlanExecutor::ExecState state = exec->getNext(&next, NULL);
if ( state == PlanExecutor::IS_EOF ) {
break;
}
invariant( state == PlanExecutor::ADVANCED );
firstBatch.append(next);
}
CursorId cursorId = 0LL;
if ( !exec->isEOF() ) {
exec->saveState();
ClientCursor* cursor = new ClientCursor(CursorManager::getGlobalCursorManager(),
exec.release(),
cursorNamespace);
cursorId = cursor->cursorid();
}
appendCursorResponseObject( cursorId, cursorNamespace, firstBatch.arr(), &result );
return true;
}
} cmdListIndexes;
}
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