Ping command is not supported in Pub/Sub connection

[TsybulskyStepan]

Bug Report

Current Behavior

When I try to send PING command into Pub/Sub connection I'm getting a following error message:

io.lettuce.core.RedisException: Command PING not allowed while subscribed. Allowed commands are: [PSUBSCRIBE, QUIT, PUNSUBSCRIBE, SUBSCRIBE, UNSUBSCRIBE]

Test

@Test
public void whenPingInPubSub_PongIsReturned() {
    RedisClient client = RedisClient.create(RedisURI.builder().withHost("localhost").withPort(6379).build());

    RedisPubSubReactiveCommands<String, String> pubsub = client.connectPubSub().reactive();

    Mono<Void> subscribe = pubsub.subscribe("channel-test");
    Mono<String> ping = Mono.delay(Duration.ofSeconds(1)).flatMap(tick -> pubsub.ping());

    Mono<String> pingAfterSubscription = subscribe.then(ping);

    StepVerifier
        .create(pingAfterSubscription)
        .expectNextMatches("PONG"::equals)
        .verifyComplete();
}

Expected behavior/code

As it was already discussed Lettuce version 6.0.x and above should permit PING command in Pub/Sub channels as it has already being supported by Redis 6.

Environment

• Lettuce version: 6.0.1.RELEASE
• Redis version: 6.0.9

Possible Solution

It's required to extend a list of allowed commands.

[mp911de]

That's in place now.