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/**
* Copyright (C) 2014-2016 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/auth/authorization_session.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_response.h"
#include "mongo/db/query/find_common.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/stdx/memory.h"
namespace mongo {
using std::string;
using std::stringstream;
using std::unique_ptr;
using std::vector;
using stdx::make_unique;
namespace {
/**
* 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 supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
virtual void help(stringstream& help) const {
help << "list indexes for a collection";
}
virtual Status checkAuthForCommand(ClientBasic* client,
const std::string& dbname,
const BSONObj& cmdObj) {
AuthorizationSession* authzSession = AuthorizationSession::get(client);
// Check for the listIndexes ActionType on the database, or find on system.indexes for pre
// 3.0 systems.
NamespaceString ns(parseNs(dbname, cmdObj));
if (authzSession->isAuthorizedForActionsOnResource(ResourcePattern::forExactNamespace(ns),
ActionType::listIndexes) ||
authzSession->isAuthorizedForActionsOnResource(
ResourcePattern::forExactNamespace(NamespaceString(dbname, "system.indexes")),
ActionType::find)) {
return Status::OK();
}
return Status(ErrorCodes::Unauthorized,
str::stream()
<< "Not authorized to list indexes on collection: " << ns.coll());
}
CmdListIndexes() : Command("listIndexes") {}
bool run(OperationContext* txn,
const string& dbname,
BSONObj& cmdObj,
int,
string& errmsg,
BSONObjBuilder& result) {
const NamespaceString ns(parseNs(dbname, cmdObj));
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());
auto ws = make_unique<WorkingSet>();
auto root = make_unique<QueuedDataStage>(txn, 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());
WorkingSetID id = ws->allocate();
WorkingSetMember* member = ws->get(id);
member->keyData.clear();
member->recordId = RecordId();
member->obj = Snapshotted<BSONObj>(SnapshotId(), indexSpec.getOwned());
member->transitionToOwnedObj();
root->pushBack(id);
}
const std::string cursorNamespace = str::stream() << dbname << ".$cmd." << getName() << "."
<< ns.coll();
dassert(NamespaceString(cursorNamespace).isValid());
dassert(NamespaceString(cursorNamespace).isListIndexesCursorNS());
dassert(ns == NamespaceString(cursorNamespace).getTargetNSForListIndexes());
auto statusWithPlanExecutor = PlanExecutor::make(
txn, std::move(ws), std::move(root), cursorNamespace, PlanExecutor::YIELD_MANUAL);
if (!statusWithPlanExecutor.isOK()) {
return appendCommandStatus(result, statusWithPlanExecutor.getStatus());
}
unique_ptr<PlanExecutor> exec = std::move(statusWithPlanExecutor.getValue());
BSONArrayBuilder firstBatch;
for (long long objCount = 0; objCount < batchSize; objCount++) {
BSONObj next;
PlanExecutor::ExecState state = exec->getNext(&next, NULL);
if (state == PlanExecutor::IS_EOF) {
break;
}
invariant(state == PlanExecutor::ADVANCED);
// If we can't fit this result inside the current batch, then we stash it for later.
if (!FindCommon::haveSpaceForNext(next, objCount, firstBatch.len())) {
exec->enqueue(next);
break;
}
firstBatch.append(next);
}
CursorId cursorId = 0LL;
if (!exec->isEOF()) {
exec->saveState();
exec->detachFromOperationContext();
ClientCursor* cursor =
new ClientCursor(CursorManager::getGlobalCursorManager(),
exec.release(),
cursorNamespace,
txn->recoveryUnit()->isReadingFromMajorityCommittedSnapshot());
cursorId = cursor->cursorid();
}
appendCursorResponseObject(cursorId, cursorNamespace, firstBatch.arr(), &result);
return true;
}
} cmdListIndexes;
} // namespace
} // namespace mongo
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