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Add per-shard Redis circuit breakers
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106 changes: 106 additions & 0 deletions
106
...ain/java/org/whispersystems/textsecuregcm/redis/ClusterFaultTolerantPubSubConnection.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /* | ||
| * Copyright 2013-2020 Signal Messenger, LLC | ||
| * SPDX-License-Identifier: AGPL-3.0-only | ||
| */ | ||
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| package org.whispersystems.textsecuregcm.redis; | ||
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| import static org.whispersystems.textsecuregcm.metrics.MetricsUtil.name; | ||
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| import io.github.resilience4j.circuitbreaker.CircuitBreaker; | ||
| import io.github.resilience4j.retry.Retry; | ||
| import io.lettuce.core.RedisException; | ||
| import io.lettuce.core.cluster.event.ClusterTopologyChangedEvent; | ||
| import io.lettuce.core.cluster.pubsub.StatefulRedisClusterPubSubConnection; | ||
| import io.micrometer.core.instrument.Metrics; | ||
| import io.micrometer.core.instrument.Tags; | ||
| import io.micrometer.core.instrument.Timer; | ||
| import java.util.function.Consumer; | ||
| import java.util.function.Function; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
| import org.whispersystems.textsecuregcm.util.CircuitBreakerUtil; | ||
| import reactor.core.scheduler.Scheduler; | ||
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| public class ClusterFaultTolerantPubSubConnection<K, V> implements FaultTolerantPubSubConnection<K, V> { | ||
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| private static final Logger logger = LoggerFactory.getLogger(ClusterFaultTolerantPubSubConnection.class); | ||
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| private final String name; | ||
| private final StatefulRedisClusterPubSubConnection<K, V> pubSubConnection; | ||
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| private final CircuitBreaker circuitBreaker; | ||
| private final Retry retry; | ||
| private final Retry resubscribeRetry; | ||
| private final Scheduler topologyChangedEventScheduler; | ||
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| private final Timer executeTimer; | ||
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| public ClusterFaultTolerantPubSubConnection(final String name, | ||
| final StatefulRedisClusterPubSubConnection<K, V> pubSubConnection, final CircuitBreaker circuitBreaker, | ||
| final Retry retry, final Retry resubscribeRetry, final Scheduler topologyChangedEventScheduler) { | ||
| this.name = name; | ||
| this.pubSubConnection = pubSubConnection; | ||
| this.circuitBreaker = circuitBreaker; | ||
| this.retry = retry; | ||
| this.resubscribeRetry = resubscribeRetry; | ||
| this.topologyChangedEventScheduler = topologyChangedEventScheduler; | ||
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| this.pubSubConnection.setNodeMessagePropagation(true); | ||
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| this.executeTimer = Metrics.timer(name(getClass(), "execute"), "clusterName", name + "-pubsub"); | ||
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| CircuitBreakerUtil.registerMetrics(circuitBreaker, ClusterFaultTolerantPubSubConnection.class, Tags.empty()); | ||
| } | ||
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| @Override | ||
| public void usePubSubConnection(final Consumer<StatefulRedisClusterPubSubConnection<K, V>> consumer) { | ||
| try { | ||
| circuitBreaker.executeCheckedRunnable( | ||
| () -> retry.executeRunnable(() -> executeTimer.record(() -> consumer.accept(pubSubConnection)))); | ||
| } catch (final Throwable t) { | ||
| if (t instanceof RedisException) { | ||
| throw (RedisException) t; | ||
| } else { | ||
| throw new RedisException(t); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public <T> T withPubSubConnection(final Function<StatefulRedisClusterPubSubConnection<K, V>, T> function) { | ||
| try { | ||
| return circuitBreaker.executeCheckedSupplier( | ||
| () -> retry.executeCallable(() -> executeTimer.record(() -> function.apply(pubSubConnection)))); | ||
| } catch (final Throwable t) { | ||
| if (t instanceof RedisException) { | ||
| throw (RedisException) t; | ||
| } else { | ||
| throw new RedisException(t); | ||
| } | ||
| } | ||
| } | ||
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| @Override | ||
| public void subscribeToClusterTopologyChangedEvents(final Runnable eventHandler) { | ||
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| usePubSubConnection(connection -> connection.getResources().eventBus().get() | ||
| .filter(event -> event instanceof ClusterTopologyChangedEvent) | ||
| .subscribeOn(topologyChangedEventScheduler) | ||
| .subscribe(event -> { | ||
| logger.info("Got topology change event for {}, resubscribing all keyspace notifications", name); | ||
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| resubscribeRetry.executeRunnable(() -> { | ||
| try { | ||
| eventHandler.run(); | ||
| } catch (final RuntimeException e) { | ||
| logger.warn("Resubscribe for {} failed", name, e); | ||
| throw e; | ||
| } | ||
| }); | ||
| })); | ||
| } | ||
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| } |
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