{"record":{"id":"1b035836ea224cb7","repo":"nautechsystems/nautilus_trader","slug":"hypersync-parsing-of-flash-event-is-not-defined-in","errorCode":null,"errorMessage":"HyperSync parsing of flash event is not defined in this dex: {}:{}","messagePattern":"HyperSync parsing of flash event is not defined in this dex: (.+?):(.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/exchanges/extended.rs","lineNumber":384,"sourceCode":"        } else {\n            anyhow::bail!(\n                \"HyperSync parsing of collect event is not defined in this dex: {}:{}\",\n                self.dex.chain,\n                self.dex.name\n            )\n        }\n    }\n\n    /// Parses a flash event from a HyperSync log.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if the DEX does not have a HyperSync flash event parser defined or if parsing fails.\n    pub fn parse_flash_event_hypersync(&self, log: &HypersyncLog) -> anyhow::Result<FlashEvent> {\n        if let Some(parse_fn) = &self.parse_flash_event_hypersync_fn {\n            parse_fn(self.dex.clone(), log)\n        } else {\n            anyhow::bail!(\n                \"HyperSync parsing of flash event is not defined in this dex: {}:{}\",\n                self.dex.chain,\n                self.dex.name\n            )\n        }\n    }\n\n    /// Parses a `SetFeeProtocol` event from a HyperSync log.\n    ///\n    /// # Errors\n    ///\n    /// Returns an error if the DEX does not have a HyperSync `SetFeeProtocol` event parser defined or if parsing fails.\n    pub fn parse_fee_protocol_update_event_hypersync(\n        &self,\n        log: &HypersyncLog,\n    ) -> anyhow::Result<FeeProtocolUpdateEvent> {\n        if let Some(parse_fn) = &self.parse_fee_protocol_update_event_hypersync_fn {\n            parse_fn(self.dex.clone(), log)","sourceCodeStart":366,"sourceCodeEnd":402,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/exchanges/extended.rs#L366-L402","documentation":"Raised by parse_flash_event_hypersync when no HyperSync flash-event parser (parse_flash_event_hypersync_fn) is registered on the DEX. Flash-loan/flash-swap events are optional capabilities; when the parser slot is None the method bails with chain:name. It indicates the DEX adapter was never taught to decode flash events over HyperSync.","triggerScenarios":"Calling dex.parse_flash_event_hypersync(&log) (e.g. via send_dex_event_log dispatch) on a DEX without flash event support, such as a v2-style AMM or a fork that omits flash callbacks.","commonSituations":"Subscribing to flash topic logs across all DEXs; a DEX registration template that omitted flash parsing; analysing MEV/flash-loan activity on a DEX that does not emit these events; incomplete fork support.","solutions":["Register a flash event HyperSync parser for the DEX if it supports flash loans/swaps.","Remove flash topics from this DEX's HyperSync log queries when unsupported.","Verify the emitting contract before routing the log to this adapter.","Treat missing parser as 'not supported' and skip the log gracefully."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"if !dex_supports(dex, DexEvent::FlashHypersync) { skip_log(); }","typeGuard":"fn has_hypersync_flash_parser(dex: &Dex) -> bool { dex.parse_flash_event_hypersync_fn.is_some() }","tryCatchPattern":"match dex.parse_flash_event_hypersync(&log) {\n    Ok(evt) => handle_flash(evt),\n    Err(e) if e.to_string().contains(\"not defined in this dex\") => tracing::debug!(\"flash events unsupported on this dex\"),\n    Err(e) => return Err(e),\n}","preventionTips":["Register flash parsers only for DEXs with flash loan/swap callbacks, and gate subscriptions accordingly.","Separate flash/MEV monitoring from general DEX ingestion pipelines.","Verify emitting contracts before dispatching flash-topic logs.","Document per-DEX flash support to avoid repeated capability probing."],"tags":["dex","hypersync","event-parsing","flash-loan","rust"],"backgroundTag":"unsupported-operation","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}