juspay/hyperswitch · error

failed to publish on authenticated connection

Error message

failed to publish on authenticated connection

What it means

Panic from expect() on publisher.publish(&channel, RedisValue::from_string(...)) in test_authenticated_connection_pubsub (crates/redis_interface/src/test.rs:2389). The PUBLISH command on the authenticated publisher connection returned Err, aborting the test. Note this is the publish call itself failing, not the subscriber failing to receive (that path is handled by the timeout/match below).

Solutions

1. Verify the authenticated connection pool is healthy before publish (the subscribe step just succeeded means creds are likely fine; check connection drop/reconnect handling).
2. Include the channel and underlying error in the panic message to diagnose; run redis-cli PUBLISH manually against the same server to confirm server-side health.
3. If publishing right after subscribe, keep the sleep(100ms) so the subscriber is ready, and confirm publish targets the same channel name/type (exact channel vs pattern).
4. For cluster deployments ensure the publisher uses cluster-aware routing instead of a single-node client.

Example fix

// before
pool.redis_conn
    .publisher
    .publish(&channel, RedisValue::from_string(test_message.to_string()))
    .await
    .expect("failed to publish on authenticated connection");
// after
pool.redis_conn
    .publisher
    .publish(&channel, RedisValue::from_string(test_message.to_string()))
    .await
    .unwrap_or_else(|e| panic!("failed to publish to {channel}: {e:?}"));

// ensure subscriber is ready before publishing:
tokio::time::sleep(std::time::Duration::from_millis(100)).await;
// and verify the channel string is identical on both sides:
assert_eq!(subscriber_channel, publisher_channel);

pool.redis_conn.publisher.publish(&channel, value).await
    .unwrap_or_else(|e| panic!("failed to publish to {channel}: {e:?}"));

When it happens

Trigger: pool.redis_conn.publisher.publish(...) returns Err: publisher connection dropped/unauthenticated, Redis unreachable, or the publisher client was constructed for a different mode (cluster vs standalone) than the server.

Common situations: Redis restarted between subscribe and publish killing pooled connections; wrong password on the publisher half of the split conn; keyslot/cluster routing errors when publishing to a channel on a cluster node that doesn't serve it.

Understand the failure class

Background: ECONNREFUSED and "connection refused" / "could not connect to server" errors: what they mean and how to fix them — this error's family across 44 libraries.

• Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

Related errors

• failed to subscribe on authenticated connection
• failed to connect to authenticated redis
• Spawn block failure
• authenticated redis settings failed validation
• todo!()

AI-assisted analysis of juspay/hyperswitch@afd9284352 (2026-09-18). Data as JSON: /api/errors/cebea0c469d30651. Report an issue: GitHub.

Appendix: source

Thrown at crates/redis_interface/src/test.rs:2389

            let channel = format!("test_auth_pubsub_{}", unique_test_id());
            let test_message = "authenticated_message";

            pool.redis_conn
                .subscriber
                .subscribe(&channel)
                .await
                .expect("failed to subscribe on authenticated connection");

            let mut receiver = pool.redis_conn.subscriber.message_rx();

            tokio::time::sleep(std::time::Duration::from_millis(100)).await;

            pool.redis_conn
                .publisher
                .publish(&channel, RedisValue::from_string(test_message.to_string()))
                .await
                .expect("failed to publish on authenticated connection");

            let received =
                tokio::time::timeout(std::time::Duration::from_secs(5), receiver.recv()).await;

            match received {
                Ok(Ok(msg)) => {
                    let value_str = redis_value_to_option_string(&msg.value);
                    msg.channel == channel && value_str.as_deref() == Some(test_message)
                }
                _ => false,
            }
        })
    })
    .await
    .expect("Spawn block failure");

    assert!(is_success);
}

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