78 lines
2.5 KiB
C++
78 lines
2.5 KiB
C++
/*
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* KnobProtectiveGroups.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "fdbserver/KnobProtectiveGroups.h"
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#include <array>
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#include "flow/Knobs.h"
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#include "fdbclient/Knobs.h"
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#include "fdbclient/ServerKnobCollection.h"
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#include "fdbserver/Knobs.h"
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void KnobKeyValuePairs::set(const std::string& name, const ParsedKnobValue value) {
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ASSERT(knobs.count(name) == 0);
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knobs[name] = value;
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}
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const KnobKeyValuePairs::container_t& KnobKeyValuePairs::getKnobs() const {
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return knobs;
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}
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KnobProtectiveGroup::KnobProtectiveGroup(const KnobKeyValuePairs& overriddenKnobKeyValuePairs_)
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: overriddenKnobs(overriddenKnobKeyValuePairs_) {
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snapshotOriginalKnobs();
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assignKnobs(overriddenKnobs);
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}
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KnobProtectiveGroup::~KnobProtectiveGroup() {
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assignKnobs(originalKnobs);
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}
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void KnobProtectiveGroup::snapshotOriginalKnobs() {
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for (const auto& [name, _] : overriddenKnobs.getKnobs()) {
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ParsedKnobValue value = CLIENT_KNOBS->getKnob(name);
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if (std::get_if<NoKnobFound>(&value)) {
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value = SERVER_KNOBS->getKnob(name);
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}
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if (std::get_if<NoKnobFound>(&value)) {
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value = FLOW_KNOBS->getKnob(name);
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}
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if (std::get_if<NoKnobFound>(&value)) {
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ASSERT(false);
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}
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originalKnobs.set(name, value);
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TraceEvent(SevInfo, "SnapshotKnobValue")
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.detail("KnobName", name)
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.detail("KnobValue", KnobValueRef::create(value).toString());
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}
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}
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void KnobProtectiveGroup::assignKnobs(const KnobKeyValuePairs& overrideKnobs) {
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auto& mutableServerKnobs = dynamic_cast<ServerKnobCollection&>(IKnobCollection::getMutableGlobalKnobCollection());
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for (const auto& [name, value] : overrideKnobs.getKnobs()) {
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Standalone<KnobValueRef> valueRef = KnobValueRef::create(value);
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ASSERT(mutableServerKnobs.trySetKnob(name, valueRef));
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TraceEvent(SevInfo, "AssignKnobValue").detail("KnobName", name).detail("KnobValue", valueRef.toString());
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}
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}
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