{"record":{"id":"8b82a5f7706a1437","repo":"nautechsystems/nautilus_trader","slug":"missing-data-in-mint-event-log","errorCode":null,"errorMessage":"Missing data in mint event log","messagePattern":"Missing data in mint event log","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crates/adapters/blockchain/src/exchanges/parsing/uniswap_v3/mint.rs","lineNumber":116,"sourceCode":"        );\n        let pool_identifier = PoolIdentifier::Address(Ustr::from(&pool_address.to_string()));\n        Ok(MintEvent::new(\n            dex,\n            pool_identifier,\n            extract_block_number(log)?,\n            extract_transaction_hash(log)?,\n            extract_transaction_index(log)?,\n            extract_log_index(log)?,\n            decoded.sender,\n            owner,\n            tick_lower,\n            tick_upper,\n            decoded.amount,\n            decoded.amount0,\n            decoded.amount1,\n        ))\n    } else {\n        Err(anyhow::anyhow!(\"Missing data in mint event log\"))\n    }\n}\n\n/// Parses a mint event from an RPC log.\n///\n/// # Errors\n///\n/// Returns an error if the log parsing fails or if the event data is invalid.\npub fn parse_mint_event_rpc(dex: SharedDex, log: &RpcLog) -> anyhow::Result<MintEvent> {\n    rpc_log::validate_event_signature(log, MINT_EVENT_SIGNATURE_HASH, \"Mint\")?;\n\n    let owner = rpc_log::extract_address_from_topic(log, 1, \"owner\")?;\n\n    // Extract int24 tickLower from topic2 (stored as a 32-byte padded value)\n    let tick_lower_bytes = rpc_log::extract_topic_bytes(log, 2)?;\n    let tick_lower = i32::from_be_bytes(tick_lower_bytes[28..32].try_into()?);\n\n    // Extract int24 tickUpper from topic3 (stored as a 32-byte padded value)","sourceCodeStart":98,"sourceCodeEnd":134,"githubUrl":"https://github.com/nautechsystems/nautilus_trader/blob/18893faf8b356be3320add8de2f861b0b647cf06/crates/adapters/blockchain/src/exchanges/parsing/uniswap_v3/mint.rs#L98-L134","documentation":"parse_mint_event_hypersync throws this when the Hypersync-decoded Mint event payload is None, so the mint amount, amount0, amount1, and tick bounds cannot be populated. The library will not fabricate a Mint event from topic data alone since the amounts live in the data section. This is the standard fallback branch of the uniswap_v3 hypersync parsers.","triggerScenarios":"Calling parse_mint_event_hypersync with a log whose decoded field is None — topic0 matched the Mint signature but the data section was missing, truncated, or failed Hypersync decoding into the expected Mint struct.","commonSituations":"Non-standard contracts emitting Mint-shaped topic0 without data; Hypersync ABI drift after adapter updates; partially indexed logs during reorgs; hand-built test logs missing the data field.","solutions":["Confirm the log's data section exists and holds the expected 32-byte words for the Mint event.","Verify the Hypersync Mint ABI registration so decoding returns Some(decoded).","Filter non-conforming logs upstream and log them instead of letting the batch fail.","Bump/re-align adapter and Hypersync client versions and re-fetch the range."],"exampleFix":null,"handlingStrategy":"validation","validationCode":"fn can_parse_mint(log: &Log) -> bool {\n    log.data.len() >= 96 // amount, amount0, amount1 words\n}","typeGuard":"fn has_decoded_mint(decoded: &Option<MintDecoded>) -> bool {\n    decoded.is_some()\n}","tryCatchPattern":"match parse_mint_event_hypersync(&log) {\n    Ok(event) => handle(event),\n    Err(e) if e.to_string().contains(\"Missing data in mint event log\") => {\n        tracing::warn!(\"skipping malformed mint log\");\n    }\n    Err(e) => return Err(e),\n}","preventionTips":["Pre-validate the data section length before calling the parser.","Restrict ingestion to canonical V3 pool addresses.","Keep Hypersync ABI registrations current.","Log and skip malformed events instead of failing entire batches."],"tags":["blockchain","uniswap-v3","log-parsing","hypersync"],"backgroundTag":"missing-required-argument","analyzedSha":"18893faf8b356be3320add8de2f861b0b647cf06","analyzedAt":"2026-09-08T20:49:34.690Z","contentChangedAt":"2026-09-08T20:49:34.690Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}