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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.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/commands/current_op_common.h"
#include <string>
#include "mongo/db/commands/test_commands_enabled.h"
#include "mongo/db/namespace_string.h"
#include "mongo/idl/command_generic_argument.h"
namespace mongo {
namespace {
static constexpr auto kAll = "$all"_sd;
static constexpr auto kOwnOps = "$ownOps"_sd;
static constexpr auto kTruncateOps = "$truncateOps"_sd;
static const StringDataSet kCurOpCmdParams = {kAll, kOwnOps, kTruncateOps};
} // namespace
bool CurrentOpCommandBase::run(OperationContext* opCtx,
const std::string& dbName,
const BSONObj& cmdObj,
BSONObjBuilder& result) {
// Convert the currentOp command spec into an equivalent aggregation command. This will be
// of the form {aggregate:1, pipeline: [{$currentOp: {idleConnections: $all, allUsers:
// !$ownOps, truncateOps: true}}, {$match: {<filter>}}, {$group: {_id: null, inprog: {$push:
// "$$ROOT"}}}], cursor:{}}
std::vector<BSONObj> pipeline;
// {$currentOp: {idleConnections: $all, allUsers: !$ownOps, truncateOps: true}}
BSONObjBuilder currentOpBuilder;
BSONObjBuilder currentOpSpecBuilder(currentOpBuilder.subobjStart("$currentOp"));
// If test commands are enabled, then we allow the currentOp commands to specify whether or not
// to truncate long operations via the '$truncateOps' parameter. Otherwise, we always truncate
// operations to match the behaviour of the legacy currentOp command.
const bool truncateOps =
!getTestCommandsEnabled() || !cmdObj[kTruncateOps] || cmdObj[kTruncateOps].trueValue();
currentOpSpecBuilder.append("idleConnections", cmdObj[kAll].trueValue());
currentOpSpecBuilder.append("allUsers", !cmdObj[kOwnOps].trueValue());
currentOpSpecBuilder.append("truncateOps", truncateOps);
currentOpSpecBuilder.doneFast();
pipeline.push_back(currentOpBuilder.obj());
// {$match: {<user-defined filter>}}
BSONObjBuilder matchBuilder;
BSONObjBuilder matchSpecBuilder(matchBuilder.subobjStart("$match"));
size_t idx = 0;
for (const auto& elt : cmdObj) {
const auto fieldName = elt.fieldNameStringData();
if (0 == idx++ || kCurOpCmdParams.count(fieldName) || isGenericArgument(fieldName)) {
continue;
}
matchSpecBuilder.append(elt);
}
matchSpecBuilder.doneFast();
pipeline.push_back(matchBuilder.obj());
// Perform any required modifications to the pipeline before adding the final $group stage.
modifyPipeline(&pipeline);
// {$group: {_id: null, inprog: {$push: "$$ROOT"}}}
BSONObjBuilder groupBuilder;
BSONObjBuilder groupSpecBuilder(groupBuilder.subobjStart("$group"));
groupSpecBuilder.append("_id", 0);
BSONObjBuilder inprogSpecBuilder(groupSpecBuilder.subobjStart("inprog"));
inprogSpecBuilder.append("$push", "$$ROOT");
inprogSpecBuilder.doneFast();
groupSpecBuilder.doneFast();
pipeline.push_back(groupBuilder.obj());
// Pipeline is complete; create an AggregateCommandRequest for $currentOp.
AggregateCommandRequest request(
NamespaceString::makeCollectionlessAggregateNSS(TenantDatabaseName(boost::none, "admin")),
std::move(pipeline));
// Run the pipeline and obtain a CursorResponse.
auto aggResults = uassertStatusOK(runAggregation(opCtx, request));
if (aggResults.getBatch().empty()) {
result.append("inprog", BSONArray());
} else {
result.append(aggResults.getBatch().front()["inprog"]);
}
// Make any final custom additions to the response object.
appendToResponse(&result);
return true;
}
} // namespace mongo
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