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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_catalog_entry.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/cursor_manager.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/index/index_descriptor.h"
#include "mongo/db/query/cursor_request.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 BasicCommand {
public:
CmdListIndexes() : BasicCommand("listIndexes") {}
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kOptIn;
}
virtual bool adminOnly() const {
return false;
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return false;
}
std::string help() const override {
return "list indexes for a collection";
}
Status checkAuthForOperation(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj) const override {
AuthorizationSession* authzSession = AuthorizationSession::get(opCtx->getClient());
if (!authzSession->isAuthorizedToParseNamespaceElement(cmdObj.firstElement())) {
return Status(ErrorCodes::Unauthorized, "Unauthorized");
}
// Check for the listIndexes ActionType on the database.
const auto nss = AutoGetCollection::resolveNamespaceStringOrUUID(
opCtx, CommandHelpers::parseNsOrUUID(dbname, cmdObj));
if (authzSession->isAuthorizedForActionsOnResource(ResourcePattern::forExactNamespace(nss),
ActionType::listIndexes)) {
return Status::OK();
}
return Status(ErrorCodes::Unauthorized,
str::stream() << "Not authorized to list indexes on collection: "
<< nss.ns());
}
bool run(OperationContext* opCtx,
const string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder& result) {
const long long defaultBatchSize = std::numeric_limits<long long>::max();
long long batchSize;
uassertStatusOK(
CursorRequest::parseCommandCursorOptions(cmdObj, defaultBatchSize, &batchSize));
std::unique_ptr<PlanExecutor, PlanExecutor::Deleter> exec;
NamespaceString cursorNss;
BSONArrayBuilder firstBatch;
{
AutoGetCollectionForReadCommand ctx(opCtx,
CommandHelpers::parseNsOrUUID(dbname, cmdObj));
Collection* collection = ctx.getCollection();
uassert(ErrorCodes::NamespaceNotFound,
str::stream() << "ns does not exist: " << ctx.getNss().ns(),
collection);
const CollectionCatalogEntry* cce = collection->getCatalogEntry();
invariant(cce);
const auto nss = ctx.getNss();
vector<string> indexNames;
writeConflictRetry(opCtx, "listIndexes", nss.ns(), [&indexNames, &cce, &opCtx] {
indexNames.clear();
cce->getReadyIndexes(opCtx, &indexNames);
});
auto ws = make_unique<WorkingSet>();
auto root = make_unique<QueuedDataStage>(opCtx, ws.get());
for (size_t i = 0; i < indexNames.size(); i++) {
BSONObj indexSpec = writeConflictRetry(
opCtx, "listIndexes", nss.ns(), [&cce, &opCtx, &indexNames, i] {
return cce->getIndexSpec(opCtx, indexNames[i]);
});
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);
}
cursorNss = NamespaceString::makeListIndexesNSS(dbname, nss.coll());
invariant(nss == cursorNss.getTargetNSForListIndexes());
exec = uassertStatusOK(PlanExecutor::make(
opCtx, std::move(ws), std::move(root), cursorNss, PlanExecutor::NO_YIELD));
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);
}
if (exec->isEOF()) {
appendCursorResponseObject(0LL, cursorNss.ns(), firstBatch.arr(), &result);
return true;
}
exec->saveState();
exec->detachFromOperationContext();
} // Drop collection lock. Global cursor registration must be done without holding any
// locks.
const auto pinnedCursor = CursorManager::getGlobalCursorManager()->registerCursor(
opCtx,
{std::move(exec),
cursorNss,
AuthorizationSession::get(opCtx->getClient())->getAuthenticatedUserNames(),
repl::ReadConcernArgs::get(opCtx).getLevel(),
cmdObj});
appendCursorResponseObject(
pinnedCursor.getCursor()->cursorid(), cursorNss.ns(), firstBatch.arr(), &result);
return true;
}
} cmdListIndexes;
} // namespace
} // namespace mongo
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