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[#9371] Periodically renew SendSpan with transport
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youngjin.kim2
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Nov 4, 2022
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249 changes: 249 additions & 0 deletions
249
...src/main/java/com/navercorp/pinpoint/profiler/grpc/SubconnectionExpiringLoadBalancer.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,249 @@ | ||
| /* | ||
| * Copyright 2022 NAVER Corp. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package com.navercorp.pinpoint.profiler.grpc; | ||
|
|
||
| import io.grpc.Attributes; | ||
| import io.grpc.ConnectivityState; | ||
| import io.grpc.ConnectivityStateInfo; | ||
| import io.grpc.EquivalentAddressGroup; | ||
| import io.grpc.LoadBalancer; | ||
| import io.grpc.Status; | ||
|
|
||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicReference; | ||
| import java.util.function.Consumer; | ||
|
|
||
| import static io.grpc.ConnectivityState.*; | ||
|
|
||
| /** | ||
| * @author youngjin.kim2 | ||
| */ | ||
| public class SubconnectionExpiringLoadBalancer extends LoadBalancer { | ||
| private static final long subchannelMaxAge = TimeUnit.MINUTES.toNanos(5); | ||
|
|
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| private final Helper helper; | ||
| private List<EquivalentAddressGroup> currentAddresses; | ||
| private Subchannel readySubchannel; | ||
| private Subchannel failureSubchannel; | ||
| private Subchannel connectingSubchannel; | ||
|
|
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| private Status failureStatus; | ||
|
|
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| private boolean initialized = false; | ||
|
|
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| SubconnectionExpiringLoadBalancer(Helper helper) { | ||
| this.helper = helper; | ||
| } | ||
|
|
||
| @Override | ||
| public void handleResolvedAddresses(ResolvedAddresses resolvedAddresses) { | ||
| final List<EquivalentAddressGroup> addresses = resolvedAddresses.getAddresses(); | ||
| this.updateAddresses(addresses); | ||
| this.currentAddresses = addresses; | ||
|
|
||
| if (!initialized) { | ||
| initialized = true; | ||
| this.createSubchannel(); | ||
| helper.updateBalancingState(CONNECTING, new Picker(PickResult.withNoResult())); | ||
| } | ||
| } | ||
|
|
||
| private void updateAddresses(List<EquivalentAddressGroup> addresses) { | ||
| if (this.readySubchannel != null) { | ||
| this.readySubchannel.updateAddresses(addresses); | ||
| } | ||
| if (this.failureSubchannel != null) { | ||
| this.failureSubchannel.updateAddresses(addresses); | ||
| } | ||
| if (this.connectingSubchannel != null) { | ||
| this.connectingSubchannel.updateAddresses(addresses); | ||
| } | ||
| } | ||
|
|
||
| private void createSubchannel() { | ||
| Subchannel subchannel = helper.createSubchannel( | ||
| CreateSubchannelArgs.newBuilder() | ||
| .setAddresses(this.currentAddresses) | ||
| .setAttributes( | ||
| Attributes.newBuilder() | ||
| .set(ATTR_PICK_PROGRESS, new AtomicReference<>(PickProgress.NOT_PICKED_YET)) | ||
| .set(ATTR_CREATED_AT, System.nanoTime()) | ||
| .build() | ||
| ) | ||
| .build() | ||
| ); | ||
|
|
||
| subchannel.start(stateInfo -> { | ||
| final ConnectivityState state = stateInfo.getState(); | ||
| if (state == SHUTDOWN) { | ||
| return; | ||
| } | ||
| if (state == TRANSIENT_FAILURE || state == IDLE) { | ||
| helper.refreshNameResolution(); | ||
| } | ||
|
|
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| moveTo(subchannel, stateInfo); | ||
| updateBalancingState(); | ||
| }); | ||
|
|
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| subchannel.requestConnection(); | ||
| } | ||
|
|
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| private void moveTo(Subchannel subchannel, ConnectivityStateInfo stateInfo) { | ||
| if (this.readySubchannel == subchannel) { | ||
| this.readySubchannel = null; | ||
| } | ||
| if (this.failureSubchannel == subchannel) { | ||
| this.failureSubchannel = null; | ||
| } | ||
| if (this.connectingSubchannel == subchannel) { | ||
| this.connectingSubchannel = null; | ||
| } | ||
|
|
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| final ConnectivityState position = stateInfo.getState(); | ||
|
|
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| if (position == READY) { | ||
| if (this.readySubchannel != null) { | ||
| this.readySubchannel.shutdown(); | ||
| } | ||
| this.readySubchannel = subchannel; | ||
| } else if (position == TRANSIENT_FAILURE) { | ||
| if (this.failureSubchannel != null) { | ||
| subchannel.shutdown(); | ||
| } else { | ||
| this.failureSubchannel = subchannel; | ||
| this.failureStatus = stateInfo.getStatus(); | ||
| } | ||
| } else if (position == CONNECTING) { | ||
| if (this.connectingSubchannel != null) { | ||
| subchannel.shutdown(); | ||
| } else { | ||
| this.connectingSubchannel = subchannel; | ||
| } | ||
| } else if (position == IDLE) { | ||
| subchannel.requestConnection(); | ||
| } | ||
| } | ||
|
|
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| private void updateBalancingState() { | ||
| if (this.readySubchannel != null) { | ||
| helper.updateBalancingState(READY, new Picker(PickResult.withSubchannel(this.readySubchannel), args -> requestSuccessor(this.readySubchannel))); | ||
| return; | ||
| } | ||
|
|
||
| if (this.connectingSubchannel != null) { | ||
| helper.updateBalancingState(CONNECTING, new Picker(PickResult.withNoResult())); | ||
| return; | ||
| } | ||
|
|
||
| if (this.failureSubchannel != null) { | ||
| helper.updateBalancingState(TRANSIENT_FAILURE, new Picker(PickResult.withError(failureStatus))); | ||
| return; | ||
| } | ||
|
|
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| helper.updateBalancingState(IDLE, new Picker(PickResult.withNoResult())); | ||
| } | ||
|
|
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| private void requestSuccessor(Subchannel subchannel) { | ||
| final long createdAt = getCreatedAt(subchannel); | ||
| if (createdAt < System.nanoTime() - subchannelMaxAge) { | ||
| final AtomicReference<PickProgress> progress = getPickProgress(subchannel); | ||
| if (progress.compareAndSet(PickProgress.NOT_PICKED_YET, PickProgress.PICKED)) { | ||
| helper.getSynchronizationContext().execute(this::createSubchannel); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public void requestConnection() { | ||
| if (this.readySubchannel != null) { | ||
| return; | ||
| } | ||
| this.createSubchannel(); | ||
| } | ||
|
|
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| @Override | ||
| public void handleNameResolutionError(Status error) { | ||
| clear(); | ||
| updateBalancingState(); | ||
| } | ||
|
|
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| @Override | ||
| public void shutdown() { | ||
| clear(); | ||
| } | ||
|
|
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| private void clear() { | ||
| if (readySubchannel != null) { | ||
| readySubchannel.shutdown(); | ||
| readySubchannel = null; | ||
| } | ||
| if (connectingSubchannel != null) { | ||
| connectingSubchannel.shutdown(); | ||
| connectingSubchannel = null; | ||
| } | ||
| if (failureSubchannel != null) { | ||
| failureSubchannel.shutdown(); | ||
| failureSubchannel = null; | ||
| } | ||
| } | ||
|
|
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| private static final class Picker extends SubchannelPicker { | ||
| private final PickResult result; | ||
| private final Consumer<PickSubchannelArgs> beforePick; | ||
|
|
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| Picker(PickResult result) { | ||
| this(result, null); | ||
| } | ||
|
|
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| Picker(PickResult result, Consumer<PickSubchannelArgs> beforePick) { | ||
| this.result = result; | ||
| this.beforePick = beforePick; | ||
| } | ||
|
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| @Override | ||
| public PickResult pickSubchannel(PickSubchannelArgs args) { | ||
| if (beforePick != null) { | ||
| beforePick.accept(args); | ||
| } | ||
| return result; | ||
| } | ||
| } | ||
|
|
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| private enum PickProgress { | ||
| NOT_PICKED_YET, | ||
| PICKED, | ||
| } | ||
|
|
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| static final Attributes.Key<AtomicReference<PickProgress>> ATTR_PICK_PROGRESS = | ||
| Attributes.Key.create("pick_progress"); | ||
| static final Attributes.Key<Long> ATTR_CREATED_AT = | ||
| Attributes.Key.create("created_at"); | ||
|
|
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| private AtomicReference<PickProgress> getPickProgress(Subchannel subchannel) { | ||
| return Objects.requireNonNull(subchannel.getAttributes().get(ATTR_PICK_PROGRESS)); | ||
| } | ||
|
|
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| private long getCreatedAt(Subchannel subchannel) { | ||
| final Long createdAt = subchannel.getAttributes().get(ATTR_CREATED_AT); | ||
| if (createdAt == null) { | ||
| return 0L; | ||
| } | ||
| return createdAt; | ||
| } | ||
| } |
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