nautechsystems/nautilus_trader · error

Stream client not connected

Error message

Stream client not connected

What it means

Error "Stream client not connected" thrown in nautechsystems/nautilus_trader.

Source

Thrown at crates/adapters/betfair/src/data.rs:961

        self.subscribed_market_ids.clear();

        log::info!("Betfair data client disconnected: {}", self.client_id);
        Ok(())
    }

    fn subscribe_book_deltas(&mut self, cmd: SubscribeBookDeltas) -> anyhow::Result<()> {
        let instrument_id = cmd.instrument_id;
        let market_id = extract_market_id(&instrument_id)?;

        if !self.subscribed_market_ids.insert(market_id.clone()) {
            log::debug!("Book deltas already subscribed for market {market_id}");
            return Ok(());
        }

        let stream_client = Arc::clone(
            self.stream_client
                .as_ref()
                .ok_or_else(|| anyhow::anyhow!("Stream client not connected"))?,
        );

        let all_ids: Vec<String> = self.subscribed_market_ids.iter().cloned().collect();

        let market_filter = StreamMarketFilter {
            market_ids: Some(all_ids),
            ..Default::default()
        };

        let data_filter = MarketDataFilter {
            fields: Some(vec![
                MarketDataFilterField::ExAllOffers,
                MarketDataFilterField::ExTraded,
                MarketDataFilterField::ExTradedVol,
                MarketDataFilterField::ExLtp,
                MarketDataFilterField::ExMarketDef,
                MarketDataFilterField::SpTraded,
                MarketDataFilterField::SpProjected,

View on GitHub (pinned to a4b06ed870)

When it happens

Trigger: Thrown at crates/adapters/betfair/src/data.rs:961 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of nautechsystems/nautilus_trader@a4b06ed870 (2026-08-16). Data as JSON: /api/errors/257686bb3dec8755. Report an issue: GitHub.