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Listen for new messages via keyspace notifications.

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This commit is contained in:
Jon Chambers
2020-08-06 11:21:55 -04:00
committed by Jon Chambers
parent 2c29f831e8
commit 8d3316ccd6
10 changed files with 313 additions and 21 deletions
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33
service/src/main/java/org/whispersystems/textsecuregcm/util/RedisClusterUtil.java
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@@ -1,6 +1,7 @@
package org.whispersystems.textsecuregcm.util;
import io.lettuce.core.cluster.SlotHash;
import org.whispersystems.textsecuregcm.redis.FaultTolerantRedisCluster;
public class RedisClusterUtil {
@@ -21,7 +22,39 @@ public class RedisClusterUtil {
}
}
/**
* Returns a Redis hash tag that maps to the given cluster slot.
*
* @param slot the Redis cluster slot for which to retrieve a hash tag
*
* @return a Redis hash tag that maps to the given cluster slot
*
* @see <a href="https://redis.io/topics/cluster-spec#keys-hash-tags">Redis Cluster Specification - Keys hash tags</a>
*/
public static String getMinimalHashTag(final int slot) {
return HASHES_BY_SLOT[slot];
}
/**
* Asserts that a Redis cluster is configured to generate (at least) a specific set of keyspace notification events.
*
* @param redisCluster the Redis cluster to check for the required keyspace notification configuration
* @param requiredKeyspaceNotifications a string representing the required keyspace notification events (e.g. "Kg$lz")
*
* @throws IllegalStateException if the given Redis cluster is not configured to generate the required keyspace
* notification events
*
* @see <a href="https://redis.io/topics/notifications#configuration">Redis Keyspace Notifications - Configuration</a>
*/
public static void assertKeyspaceNotificationsConfigured(final FaultTolerantRedisCluster redisCluster, final String requiredKeyspaceNotifications) {
final String configuredKeyspaceNotifications = redisCluster.withReadCluster(connection -> connection.sync().configGet("notify-keyspace-events"))
.getOrDefault("notify-keyspace-events", "")
.replace("A", "g$lshztxe");
for (final char requiredNotificationType : requiredKeyspaceNotifications.toCharArray()) {
if (configuredKeyspaceNotifications.indexOf(requiredNotificationType) == -1) {
throw new IllegalStateException(String.format("Required at least \"%s\" for keyspace notifications, but only had \"%s\".", requiredKeyspaceNotifications, configuredKeyspaceNotifications));
}
}
}
}