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Diffstat (limited to 'src/mongo/util/memory_util.cpp')
-rw-r--r-- | src/mongo/util/memory_util.cpp | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/src/mongo/util/memory_util.cpp b/src/mongo/util/memory_util.cpp new file mode 100644 index 00000000000..049c518b57e --- /dev/null +++ b/src/mongo/util/memory_util.cpp @@ -0,0 +1,70 @@ +/** + * Copyright (C) 2021-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/util/memory_util.h" + +#include "mongo/util/pcre.h" + +namespace mongo::memory_util { + +StatusWith<MemoryUnits> parseUnitString(const std::string& strUnit) { + if (strUnit.empty()) { + return Status(ErrorCodes::Error{6007010}, "Unit value cannot be empty"); + } + + if (strUnit[0] == '%') { + return MemoryUnits::kPercent; + } else if (strUnit[0] == 'M' || strUnit[0] == 'm') { + return MemoryUnits::kMB; + } else if (strUnit[0] == 'G' || strUnit[0] == 'g') { + return MemoryUnits::kGB; + } + + return Status(ErrorCodes::Error{6007011}, "Incorrect unit value"); +} + +StatusWith<MemorySize> MemorySize::parse(const std::string& str) { + // Looks for a floating point number with followed by a unit suffix (MB, GB, %). + static auto& re = *new pcre::Regex(R"re((?i)^\s*(\d+\.?\d*)\s*(MB|GB|%)\s*$)re"); + auto m = re.matchView(str); + if (!m) { + return {ErrorCodes::Error{6007012}, "Unable to parse plan cache size string"}; + } + double size = std::stod(std::string{m[1]}); + std::string strUnit{m[2]}; + + auto statusWithUnit = parseUnitString(strUnit); + if (!statusWithUnit.isOK()) { + return statusWithUnit.getStatus(); + } + + return MemorySize{size, statusWithUnit.getValue()}; +} + +} // namespace mongo::memory_util |