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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#pragma once
#include "mongo/db/pipeline/document_source.h"
namespace mongo {
class DocumentSourceCurrentOp final : public DocumentSource {
public:
using TruncationMode = MongoProcessInterface::CurrentOpTruncateMode;
using ConnMode = MongoProcessInterface::CurrentOpConnectionsMode;
using LocalOpsMode = MongoProcessInterface::CurrentOpLocalOpsMode;
using SessionMode = MongoProcessInterface::CurrentOpSessionsMode;
using UserMode = MongoProcessInterface::CurrentOpUserMode;
using CursorMode = MongoProcessInterface::CurrentOpCursorMode;
static constexpr StringData kStageName = "$currentOp"_sd;
class LiteParsed final : public LiteParsedDocumentSource {
public:
static std::unique_ptr<LiteParsed> parse(const AggregationRequest& request,
const BSONElement& spec);
LiteParsed(UserMode allUsers, LocalOpsMode localOps)
: _allUsers(allUsers), _localOps(localOps) {}
stdx::unordered_set<NamespaceString> getInvolvedNamespaces() const final {
return stdx::unordered_set<NamespaceString>();
}
PrivilegeVector requiredPrivileges(bool isMongos) const final {
PrivilegeVector privileges;
// In a sharded cluster, we always need the inprog privilege to run $currentOp on the
// shards. If we are only looking up local mongoS operations, we do not need inprog to
// view our own ops but *do* require it to view other users' ops.
if (_allUsers == UserMode::kIncludeAll ||
(isMongos && _localOps == LocalOpsMode::kRemoteShardOps)) {
privileges.push_back({ResourcePattern::forClusterResource(), ActionType::inprog});
}
return privileges;
}
bool allowedToForwardFromMongos() const final {
return _localOps == LocalOpsMode::kRemoteShardOps;
}
bool allowedToPassthroughFromMongos() const final {
return _localOps == LocalOpsMode::kRemoteShardOps;
}
bool isInitialSource() const final {
return true;
}
void assertSupportsReadConcern(const repl::ReadConcernArgs& readConcern) const {
uassert(ErrorCodes::InvalidOptions,
str::stream() << "Aggregation stage " << kStageName << " cannot run with a "
<< "readConcern other than 'local', or in a multi-document "
<< "transaction. Current readConcern: "
<< readConcern.toString(),
readConcern.getLevel() == repl::ReadConcernLevel::kLocalReadConcern);
}
private:
const UserMode _allUsers;
const LocalOpsMode _localOps;
};
static boost::intrusive_ptr<DocumentSourceCurrentOp> create(
const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
ConnMode includeIdleConnections = ConnMode::kExcludeIdle,
SessionMode includeIdleSessions = SessionMode::kIncludeIdle,
UserMode includeOpsFromAllUsers = UserMode::kExcludeOthers,
LocalOpsMode showLocalOpsOnMongoS = LocalOpsMode::kRemoteShardOps,
TruncationMode truncateOps = TruncationMode::kNoTruncation,
CursorMode idleCursors = CursorMode::kExcludeCursors);
GetNextResult getNext() final;
const char* getSourceName() const final;
StageConstraints constraints(Pipeline::SplitState pipeState) const final {
StageConstraints constraints(StreamType::kStreaming,
PositionRequirement::kFirst,
(_showLocalOpsOnMongoS == LocalOpsMode::kLocalMongosOps
? HostTypeRequirement::kLocalOnly
: HostTypeRequirement::kAnyShard),
DiskUseRequirement::kNoDiskUse,
FacetRequirement::kNotAllowed,
TransactionRequirement::kNotAllowed);
constraints.isIndependentOfAnyCollection = true;
constraints.requiresInputDocSource = false;
return constraints;
}
static boost::intrusive_ptr<DocumentSource> createFromBson(
BSONElement spec, const boost::intrusive_ptr<ExpressionContext>& pExpCtx);
Value serialize(boost::optional<ExplainOptions::Verbosity> explain = boost::none) const final;
private:
DocumentSourceCurrentOp(const boost::intrusive_ptr<ExpressionContext>& pExpCtx,
ConnMode includeIdleConnections,
SessionMode includeIdleSessions,
UserMode includeOpsFromAllUsers,
LocalOpsMode showLocalOpsOnMongoS,
TruncationMode truncateOps,
CursorMode idleCursors)
: DocumentSource(pExpCtx),
_includeIdleConnections(includeIdleConnections),
_includeIdleSessions(includeIdleSessions),
_includeOpsFromAllUsers(includeOpsFromAllUsers),
_showLocalOpsOnMongoS(showLocalOpsOnMongoS),
_truncateOps(truncateOps),
_idleCursors(idleCursors) {}
ConnMode _includeIdleConnections = ConnMode::kExcludeIdle;
SessionMode _includeIdleSessions = SessionMode::kIncludeIdle;
UserMode _includeOpsFromAllUsers = UserMode::kExcludeOthers;
LocalOpsMode _showLocalOpsOnMongoS = LocalOpsMode::kRemoteShardOps;
TruncationMode _truncateOps = TruncationMode::kNoTruncation;
CursorMode _idleCursors = CursorMode::kExcludeCursors;
std::string _shardName;
std::vector<BSONObj> _ops;
std::vector<BSONObj>::iterator _opsIter;
};
} // namespace mongo
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