nautechsystems/nautilus_trader · error

invalid Derive ticker channel `{channel}`

Error message

invalid Derive ticker channel `{channel}`

What it means

`ticker_channel_parts` accepts channels prefixed `ticker_slim.` or `ticker.`. This error fires when the channel has neither prefix, so it cannot be a Derive ticker channel and cannot be split into instrument name and interval.

Source

Thrown at crates/adapters/derive/src/data.rs:2321

        .filter(|value| !value.is_empty())
        .ok_or_else(|| anyhow::anyhow!("invalid Derive orderbook channel `{channel}`"))?;
    let instrument_name = parts
        .next()
        .filter(|value| !value.is_empty())
        .ok_or_else(|| anyhow::anyhow!("invalid Derive orderbook channel `{channel}`"))?;

    Ok((
        instrument_name.to_string(),
        group.to_string(),
        depth.to_string(),
    ))
}

fn ticker_channel_parts(channel: &str) -> anyhow::Result<(String, String)> {
    let rest = channel
        .strip_prefix("ticker_slim.")
        .or_else(|| channel.strip_prefix("ticker."))
        .ok_or_else(|| anyhow::anyhow!("invalid Derive ticker channel `{channel}`"))?;
    let (instrument_name, interval) = rest
        .rsplit_once('.')
        .ok_or_else(|| anyhow::anyhow!("invalid Derive ticker channel `{channel}`"))?;
    anyhow::ensure!(
        !instrument_name.is_empty() && !interval.is_empty(),
        "invalid Derive ticker channel `{channel}`"
    );

    Ok((instrument_name.to_string(), interval.to_string()))
}

fn orderbook_group(params: &Option<Params>) -> anyhow::Result<String> {
    let group = params
        .as_ref()
        .and_then(|p| {
            p.get_str("group")
                .map(ToOwned::to_owned)
                .or_else(|| p.get_u64("group").map(|value| value.to_string()))

View on GitHub (pinned to 18893faf8b)

Solutions

1. Ensure the channel starts with `ticker.` or `ticker_slim.`.
2. Route orderbook channels to `orderbook_channel_parts` instead.
3. Log the offending channel string to identify what was passed.
4. Check for renames/typos in generated subscription names.

Example fix

// before
ticker_channel_parts("orderbook.ETH-PERP.NONE.25")?;

// after
ticker_channel_parts("ticker_slim.ETH-PERP.100ms")?;

if !(channel.starts_with("ticker.") || channel.starts_with("ticker_slim.")) {
    // route to another parser or skip
}

fn is_ticker_channel(channel: &str) -> bool {
    channel.starts_with("ticker.") || channel.starts_with("ticker_slim.")
}

match ticker_channel_parts(channel) {
    Ok((instrument, interval)) => { /* handle */ }
    Err(e) => tracing::debug!("skipping non-ticker channel: {e:#}"),
}

When it happens

Trigger: Passing an orderbook or quote channel string (e.g. `orderbook.ETH-PERP.NONE.25`) into the ticker channel parsing path.

Common situations: Mixing channel kinds when unsubscribing from recorded subscriptions; a typo like `tickers.ETH-PERP.100ms`; upstream format changes.

Understand the failure class

Background: "Invalid ... format", "must be in format X", "does not look like a ..." — invalid argument format errors across CLI tools and libraries — this error's family across 17 libraries.

Related errors

• invalid Derive orderbook channel `{channel}`
• Derive WebSocket event receiver not initialized
• invalid {field} `{raw}`
• Invalid topic format: empty topic
• Failed to send SetClient command: {e}

AI-assisted analysis of nautechsystems/nautilus_trader@18893faf8b (2026-09-08). Data as JSON: /api/errors/42ffa7fcf2dbac7e. Report an issue: GitHub.