nautechsystems/nautilus_trader · error

Coinbase WebSocket handler failed: {error}

Error message

Coinbase WebSocket handler failed: {error}

What it means

During WebSocket connect, the adapter awaits the spawned handler task and inspects its join outcome. If the handler task ended in the Failed state, its error is surfaced wrapped as "Coinbase WebSocket handler failed: {error}" so the underlying cause (auth, subscription, stream error) is preserved.

Source

Thrown at crates/adapters/coinbase/src/websocket/client.rs:238

    /// Establishes the WebSocket connection and spawns the feed handler.
    pub async fn connect(&mut self) -> anyhow::Result<()> {
        if self.is_active() || self.is_reconnecting() {
            log::warn!("WebSocket already connected or reconnecting");
            return Ok(());
        }

        if let Some(outcome) = finish_task(
            &mut self.task_handle,
            WS_DISCONNECT_TIMEOUT,
            WS_DISCONNECT_TIMEOUT,
        )
        .await
        {
            match outcome {
                TaskJoinOutcome::Completed(()) | TaskJoinOutcome::Aborted => {}
                TaskJoinOutcome::Failed(error) => {
                    anyhow::bail!("Coinbase WebSocket handler failed: {error}");
                }
                TaskJoinOutcome::Incomplete => {
                    anyhow::bail!("Coinbase WebSocket handler did not stop after abort");
                }
            }
        }

        // Clear stop signal from any previous disconnect
        self.signal.store(false, Ordering::Relaxed);

        let (message_handler, raw_rx) = channel_message_handler();
        let cfg = WebSocketConfig {
            url: self.url.clone(),
            headers: vec![],
            // Coinbase uses TCP control-frame pings for transport keep-alive;
            // application-layer liveness comes from the heartbeats channel.
            heartbeat_interval_secs: Some(WS_HEARTBEAT_SECS),
            heartbeat_payload: None,

View on GitHub (pinned to 18893faf8b)

Solutions

1. Read the wrapped {error} for the root cause
2. Verify API key/secret and that the requested channels require correct credentials
3. Check network/proxy access to the Coinbase WebSocket URL and retry

Example fix

// inspect inner error
match ws.connect().await {
    Err(e) => { log::error!("root cause: {:#}", e); }
    Ok(_) => {}
}

match ws.connect().await {
    Err(e) => {
        log::error!("ws connect failed: {:#}", e); // inspect wrapped handler error
        // backoff then retry
    }
    Ok(_) => {}
}

When it happens

Trigger: connect() completes after the handler task panicked/errored — e.g. the handler failed during initial subscribe, authentication, or message processing and returned Err.

Common situations: Invalid API credentials for the user channel; WebSocket URL unreachable; handler hit a parse/protocol error and exited before connect() finished setup.

Related errors

• std::mem::take(&mut self.shutdown_errors).join("; ")
• WebSocket output receiver not available
• Coinbase WebSocket handler did not stop after abort
• Failed to send SetClient command: {e}
• errors.join("; ") (aggregated shutdown errors)

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/71b4581ec3cb5058. Report an issue: GitHub.